Conduit, It Shall Be Contained in the Conduit with the Circuit Conductors

Home , Conduit (horse)

conduit, it shall be contained in the conduit with the circuit 351-9: Accept C~ 8 conductors. Fittings and boxes shall be bonded or grounded in SUBMII-FER: TSC-Approved for the Purpose accordance with Article 250. 138 See the Technical Subcommittee "Recommendations" SUBSTANTIATION: There is a very pressing need for an NEC under the definition of "Approved for the Purpose" in Article article to cover liquidtight flexible nonmetallic conduit for a 100. growing number of present day applications. Such a product is SUBSTANTIATION: See the TSC "findings" under the definltion of being produced and has been used extensively in the machine tool "Approved for the Purpose" in Article 100. industry and other related uses for the past eleven years. At PANEL RECOMMENDATION: Accept as Revised: the present time there is no NEC reference for this material. I Delete the words "the purpose" and substitute "grounding." It may be agreed that the need for this article is such that VOTE ON PANEL RECOF~4ENDATION: Unanimously Affirmative. it might be adopted based on the known, widespread and successful use in industry of liquidtight flexible nonmetallic conduit. Once in the NEC, such a product would immediately come under the scrutiny of UL and would be required to meet the 351-9, Exception: Accept ' CMP 8 levels of safety now required for other metallic and nonmetallic SUBMITTER: TSC-Approved for the Purpose raceways before being eligible for UL or equivalent listing and 139 See the Technical Subcommittee "Recnmmendations" for use wherever inspection under the NEC was required. un--n'de~-t'~e definition of "Approved for the Purpose" in Article 220-9 of NFPA #79 Electrical Standard for Met61working Machine 100. Tools covers liquidtight flexible nonmetallic conduit and SUBSTANTIATION/ See the TSC "findings" under the definition of fittings. "Approved for the Purpose" in Article 100. E13.3.2 of EMP and EGP-I-1967 Joint Industrial Council PANEL RECOI~NIENDATION: Accept as Revised: Electrical Standard covers Nonmetallic Conduit¢ I Delete the words "the purpose° and substitute "grounding." Attached* is literature on this material: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (a) Anaconda Standard for Liquid Tight Flexible Nonmetallic Electrical Conduit; latest revision 6/12/78. (b) Anaconda Bulletin S-550 (BED), pages $3 and $7. *Attachments have been supplied to ~MP members. 351-10: Accept CMP 8 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: Dan Leaf, Westlake Village, CA I)ITOIR~TAIZT.• 140 Delete words "in concealed work" from the title, ARTICLE XXX - Liquidtight Flexible Nonmetallic Conduit an--n'B-t'F~e-word "concealed" from the text. XXX-I. Scope. This article covers use and installation SUBSTANTIATION: No restriction, per se, is placed on the requirements for liquidtight flexible nonmetallic conduit for maximum number of bends in exposed work. No limit on number of industrial application. bends could result in de~nage to conductors, in a run with XXX-2. Definition. Liquidtight flexible nonmetallic conduit is excessive number of bends, or could encourage instaliatlon of a raceway of circular cross sectioh having a smooth seamless conductors prior to conduit installation, with conduit then inner core and cover bonded together and having one or more installed as a cable system. A limit on number of bends for reinforcement layers between the core and cover. This conduit exposed work would bring this section in conformity with the is flame-resistant and with fittings is approved for the requirements for other raceway systems, such as 345-12, 346-11, installation of electrical conductors. 347-14, and 348-10. XXX-3. Use. PANEL RECOI~ENDATION: Accept as Revised: (a) Liquidtight flexible nonmetal)ic conduit shall be Delete "For concealed raceway" after the words "A run of permitted to be used: conduit" and delete "in Concealed Work" from title. (1) in exposed locations; VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (2) where flexibility is required for installation, operation or maintenance; (3) where protection of the contained conductors is required from vapors, liquids or solids. ARTICLE 352 -- SURFACE RACEWAYS (b) Liquidtight flexible nonmetallic conduit shall not be used: 352-I: Accept CMP 8 (1) where subject to ohysical damage; SUBMITTER: TSC-Approved for the Purpose (2) where any combination of ambient and conductor ]~l~b-O-S'~-~.• 141 See the Technical Subcommittee "Recummendations" temperatures is In excess of that for which the liquidtight un--n-d'e-r-'t~e definition of "Approved for the Purposeu in Article flexible nonmetallic conduit is approved; 100. (3) in lengths longer than 6 feet; SUBSTANTIATION: See the TSC "findings" under the definition of Exception: where approved for special installations. "Approved for the Purpose" in Article 100. (4) where voltage of contained conductors is in excess of PANEL RECOMMENDATION: Accept as Revised: 600 volts, nominal. Delete the words "unless approved for the purpose" and XXX-4. Size. The sizes of liquidtight flexible nonmetallic substitute "unless otherwise approved." conduit shall be electrical trade sizes 1/2 inch to 1 1/2 inch VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. inclusive. XXX-5. Nund}er of Conductors. The nuraber of conductors permitted in a single conduit shall be in accordance with the percentage fill specified in Table 1, Chapter 9. 352-1: Reject CMP 8 XXX-6. Fittings. Liquidtight flexible nonmetallic conduit SUBMITTER: S. J. Casasant~, The Wiremold Co. shall be used only with terminal fittings identified for such ~142 Add the word "only" at the end .of the first use. • ~. Add new (1) as follows: (1) in damp locations; XXX-7. Grounding. Where a grounding conductor is required for unless approved for the purpose. Renumber remainder of the circuits installed in liquidtight flexible nonmetallic paragraph. conduit, it shall be contained in the conduit with the circuit SUBSTANTIATION: The present wording is being interpreted as conductors. Fittings and boxes shall be bonded or grounded in permitting use of surface raceways in damp locations. The accordance with Arti.cle 250. addition of the word only in the above proposal clarifies that VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. surface raceways are i~tended for use in dry locations only, COMMENT ON VOTE: unless approved for use in damp locations. 8RETING: We believe the use of this material has been limited Panel 8 comment to Proposal No. 160, for the 1978 Code, for "connection to frequently moving parts" under the provisions "Product not considered suitable for damp locations," is offered of Section 210-5(e) of NFPA Standard No. 79. This possible as justification for the above Woposal. additional use restriction needs further clarification. PANEL RECO)~(ENDATION: Reject. PANEL C~ENT: No additional clarification would be achieved by this Proposal. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ARTICLE 351 -- LIQUIDTIGHT FLEXIBLE METAL CONDUIT i 351-7: Accept CMP 8 SUB)lITTER: TSC-Approved for the Purpose 352-1: Reject CMP 8 137 See the Technical Subcommittee "Reco~ndations" SUBMITTER: O. E. Dillon, Border County Div. IAEI un--n-d'e'r-~'~e definition of "Approved for the Purpose'" in Article FR-O-~'O-~-L-~: 143 In the first sentence, add the word "only" after 100. the word "permitted." In the second sentence (1), delete the SUBSTANTIATION: See the TSC "findings" under the definition of word "severe." In the second sentence (2), add the words "there. "Approved for the Purpose" in Article 100. are" after the word "where." PANEL RECOI~ENDATION: Accept as Revised: SUBSTANTIATION: The language is permissive and does not Delete the words "approved for the purpose" and add "approved" restrict the use of surface raceways. See the attached opinion* !after the word "with." of the San Diego City Attorney. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. *See Border County Div. IAEI substantiation for proposal for 110-16(a). PANEL RECOMMENDATION: Reject. PANEL COIC¢~ENT: The present wording adequately reflects the Panel's intent. VOTE ON PANEL RECO@~IENDATION: Unanimously Affirmative. 154 conduit, it shall be contained in the conduit with the circuit 351-9: Accept C~ 8 conductors. Fittings and boxes shall be bonded or grounded in SUBMII-FER: TSC-Approved for the Purpose accordance with Article 250. 138 See the Technical Subcommittee "Recommendations" SUBSTANTIATION: There is a very pressing need for an NEC under the definition of "Approved for the Purpose" in Article article to cover liquidtight flexible nonmetallic conduit for a 100. growing number of present day applications. Such a product is SUBSTANTIATION: See the TSC "findings" under the definltion of being produced and has been used extensively in the machine tool "Approved for the Purpose" in Article 100. industry and other related uses for the past eleven years. At PANEL RECOMMENDATION: Accept as Revised: the present time there is no NEC reference for this material. I Delete the words "the purpose" and substitute "grounding." It may be agreed that the need for this article is such that VOTE ON PANEL RECOF~4ENDATION: Unanimously Affirmative. it might be adopted based on the known, widespread and successful use in industry of liquidtight flexible nonmetallic conduit. Once in the NEC, such a product would immediately come under the scrutiny of UL and would be required to meet the 351-9, Exception: Accept ' CMP 8 levels of safety now required for other metallic and nonmetallic SUBMITTER: TSC-Approved for the Purpose raceways before being eligible for UL or equivalent listing and 139 See the Technical Subcommittee "Recnmmendations" for use wherever inspection under the NEC was required. un--n'de~-t'~e definition of "Approved for the Purpose" in Article 220-9 of NFPA #79 Electrical Standard for Met61working Machine 100. Tools covers liquidtight flexible nonmetallic conduit and SUBSTANTIATION/ See the TSC "findings" under the definition of fittings. "Approved for the Purpose" in Article 100. E13.3.2 of EMP and EGP-I-1967 Joint Industrial Council PANEL RECOI~NIENDATION: Accept as Revised: Electrical Standard covers Nonmetallic Conduit¢ I Delete the words "the purpose° and substitute "grounding." Attached* is literature on this material: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (a) Anaconda Standard for Liquid Tight Flexible Nonmetallic Electrical Conduit; latest revision 6/12/78. (b) Anaconda Bulletin S-550 (BED), pages $3 and $7. *Attachments have been supplied to ~MP members. 351-10: Accept CMP 8 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: Dan Leaf, Westlake Village, CA I)ITOIR~TAIZT.• 140 Delete words "in concealed work" from the title, ARTICLE XXX - Liquidtight Flexible Nonmetallic Conduit an--n'B-t'F~e-word "concealed" from the text. XXX-I. Scope. This article covers use and installation SUBSTANTIATION: No restriction, per se, is placed on the requirements for liquidtight flexible nonmetallic conduit for maximum number of bends in exposed work. No limit on number of industrial application. bends could result in de~nage to conductors, in a run with XXX-2. Definition. Liquidtight flexible nonmetallic conduit is excessive number of bends, or could encourage instaliatlon of a raceway of circular cross sectioh having a smooth seamless conductors prior to conduit installation, with conduit then inner core and cover bonded together and having one or more installed as a cable system. A limit on number of bends for reinforcement layers between the core and cover. This conduit exposed work would bring this section in conformity with the is flame-resistant and with fittings is approved for the requirements for other raceway systems, such as 345-12, 346-11, installation of electrical conductors. 347-14, and 348-10. XXX-3. Use. PANEL RECOI~ENDATION: Accept as Revised: (a) Liquidtight flexible nonmetal)ic conduit shall be Delete "For concealed raceway" after the words "A run of permitted to be used: conduit" and delete "in Concealed Work" from title. (1) in exposed locations; VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (2) where flexibility is required for installation, operation or maintenance; (3) where protection of the contained conductors is required from vapors, liquids or solids. ARTICLE 352 -- SURFACE RACEWAYS (b) Liquidtight flexible nonmetallic conduit shall not be used: 352-I: Accept CMP 8 (1) where subject to ohysical damage; SUBMITTER: TSC-Approved for the Purpose (2) where any combination of ambient and conductor ]~l~b-O-S'~-~.• 141 See the Technical Subcommittee "Recummendations" temperatures is In excess of that for which the liquidtight un--n-d'e-r-'t~e definition of "Approved for the Purposeu in Article flexible nonmetallic conduit is approved; 100. (3) in lengths longer than 6 feet; SUBSTANTIATION: See the TSC "findings" under the definition of Exception: where approved for special installations. "Approved for the Purpose" in Article 100. (4) where voltage of contained conductors is in excess of PANEL RECOMMENDATION: Accept as Revised: 600 volts, nominal. Delete the words "unless approved for the purpose" and XXX-4. Size. The sizes of liquidtight flexible nonmetallic substitute "unless otherwise approved." conduit shall be electrical trade sizes 1/2 inch to 1 1/2 inch VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. inclusive. XXX-5. Nund}er of Conductors. The nuraber of conductors permitted in a single conduit shall be in accordance with the percentage fill specified in Table 1, Chapter 9. 352-1: Reject CMP 8 XXX-6. Fittings. Liquidtight flexible nonmetallic conduit SUBMITTER: S. J. Casasant~, The Wiremold Co. shall be used only with terminal fittings identified for such ~142 Add the word "only" at the end .of the first use. • ~. Add new (1) as follows: (1) in damp locations; XXX-7. Grounding. Where a grounding conductor is required for unless approved for the purpose. Renumber remainder of the circuits installed in liquidtight flexible nonmetallic paragraph. conduit, it shall be contained in the conduit with the circuit SUBSTANTIATION: The present wording is being interpreted as conductors. Fittings and boxes shall be bonded or grounded in permitting use of surface raceways in damp locations. The accordance with Arti.cle 250. addition of the word only in the above proposal clarifies that VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. surface raceways are i~tended for use in dry locations only, COMMENT ON VOTE: unless approved for use in damp locations. 8RETING: We believe the use of this material has been limited Panel 8 comment to Proposal No. 160, for the 1978 Code, for "connection to frequently moving parts" under the provisions "Product not considered suitable for damp locations," is offered of Section 210-5(e) of NFPA Standard No. 79. This possible as justification for the above Woposal. additional use restriction needs further clarification. PANEL RECO)~(ENDATION: Reject. PANEL C~ENT: No additional clarification would be achieved by this Proposal. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ARTICLE 351 -- LIQUIDTIGHT FLEXIBLE METAL CONDUIT i 351-7: Accept CMP 8 SUB)lITTER: TSC-Approved for the Purpose 352-1: Reject CMP 8 137 See the Technical Subcommittee "Reco~ndations" SUBMITTER: O. E. Dillon, Border County Div. IAEI un--n-d'e'r-~'~e definition of "Approved for the Purpose'" in Article FR-O-~'O-~-L-~: 143 In the first sentence, add the word "only" after 100. the word "permitted." In the second sentence (1), delete the SUBSTANTIATION: See the TSC "findings" under the definition of word "severe." In the second sentence (2), add the words "there. "Approved for the Purpose" in Article 100. are" after the word "where." PANEL RECOI~ENDATION: Accept as Revised: SUBSTANTIATION: The language is permissive and does not Delete the words "approved for the purpose" and add "approved" restrict the use of surface raceways. See the attached opinion* !after the word "with." of the San Diego City Attorney. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. *See Border County Div. IAEI substantiation for proposal for 110-16(a). PANEL RECOMMENDATION: Reject. PANEL COIC¢~ENT: The present wording adequately reflects the Panel's intent. VOTE ON PANEL RECO@~IENDATION: Unanimously Affirmative. 154 352-1, Exception No. 1: Accept CMA° 8 restrict the use of underfloor raceways. See the attached SUBMITTER: TSC-Approved for the Purpose op lnion* of the San Diego City Attorney. 144 See the Technical Subcommittee "Recommendations" • *See Border County Div. IAEI substantiation for proposal for un-"6Be'r--t-f~e definition of "Approved for the Purpose" in Article 110-16(a). 100. PANEL RECO~ENDATION: Reject. SUBSTANTIATION: See the TSC "findings" under the definition of PANEL COMMENT: The present wording adequately reflects the "Approved for the Purpose" in Article 100. P'Enel's Intent. PANEL RECOI~ENDATION: ~ccept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Delete the words "approved for the purpose" and add at the end of the exception: "where identified for such use." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 354-15: Accept CMP 8 SUBMITTER: TSC-Approvedfor the Purpose PKUPOSAL: 151 See the Technical Subcommittee "Recommendations" 352-8: Accept CMP 8 un--n-d'e~-ElTe definitli)n of "Approved for the Purpose" in Article SUBMITTER: TSC-Approved for the Purpose 100. 145 See the Technical Subcommittee "Recommendations" SUBSTANTIATION: See the TSC "findings" under the definition of definition of "Approved for the Purpose" in Article "Approved for the Purpose" in Article 100. 100. P.A.NEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: See the TSC "findings" under the definition of J Deletethe words "approved for the purpose" and add "approved" "Approved for the Purpose" in Article 100. before the word "fittings." PANEL RECO~ENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. •"Delete the words "approved for the purpose for'which they are used" and add the words "identified for such use." VOTE ON PANEL REC~NDATION: Unanimously Affirmative. r ARTICLE 356 -- CELLULAR METAL FLOOR RACEWAYS

356-1: Reject CMP 8 352-22: Accept OMP 8 SUBMITTER: Charles T. Flachbarth, Walker Parkersburg Division SUBMITTER: TSC-Approved for the Purpose ~nc. 146 See the Technical Subcommittee "Recommendations" ' PROPOSAL: 152 Add a second sentence as follows: uncler the definition of "Approved for the Purpose" in Article "-"l~-6F'-Ehe purposes of this article, a cellular metal floor 100. consists of the entire floor area being covered with cellular SUBSTANTIATION: See the TSC "flndlngs" under the definition of metal floor sections or a combination of cellular metal floor "Approved .for the Purpose" in Article 100. raceway sections and corrugated metal deck sections." PANEL RECO~ENDATION: Accept as Revised: SUBSTANTIATION In some building designs, there is confusion Delete the words "unless approved for the purpose." '~egarding when a cellular metal floor raceway system as VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. described in Article 356 can be used, compared with an underfloor raceway system as described in Article 354 can be used. This proposed change will eliminate confusion regarding when Article 356 applies or when Article 354 applies, without 352-22: Reject CMP 8 changing the intention of the Code regarding the use of cellular SUBMITTER: O. E. Dillon, Border County Div. IAEI metal floor raceways or underfloor raceway systems. PRUPUSAL: 147 In the first sentence, add the word "only" after PANEL RECOI~MENDATION: Reject. "permitted." In the second sentence (2), delete the FANEL COMMENT: No additional clarification would be achieved by word "severe." this Proposal. SUBSTANTIATION: The .language is permissive and does not i.VOTE ON PANEL RECOMMENDATION: restrict the use of nonmetallic surface raceways. See the AFFIRMATIVE: 14. attached opinion* of the San Diego City Attorney. 'NEGATIVE: Breting. *See Border County Div. IAEI substantiation for proposal for EXPLANATION OF VOTE: llO-16(a). "'BREIIN6: Whlle Installation instructions are supplied by the PANEL RECO~g~ENDATION: Reject. manufacturer covering the intended floor construction, this PANEL COMMENT:' The present wording adequately reflects the proposal would provide clarification to those who may not have Panel's Intent. access to these instructions. VOTE ON PANEL RECO~iENDATION: Unanimously Affirmative.

356-11: Accept CMP 8 ARTICLE 353 -- MULTIOUTLET ASSEMBLY SUBMITTER: TSC-Approved for the Purpose PITOFOS'AL-T." 153 See the Technical Subcommittee "Recommendations" 353-2: Reject CMP 8 un--n'de'r-~-~e definition of "Approved for the Purpose" in Article SUBMITTER: O. E. Dillon, Border County Div. IAEI 100. 148 In the first sentence, add the word "only" after SUBSTANTIATION: See the TSC "findings" under the definition of "permitted." In the second sentence (2), delete the "Approved for the Purpose" in Arti~:le 100. word "severe." PANEL RECO~ENDATION: Accept as Revised: SUBSTANTIATION: The language is permissive and does not ....Delete the words "approved for the purpose" and add the word restrict the use of multloutlet assemblies. See the attached "approved" before the word "fittings." opinion* of the San Diego City Attorney. , VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. *See Border County Div. IAEI substantiation for proposal for 110~16(a). PANEL RECOMMENDATION: Reject. PANEL CDMMENT:' The present wording adequately reflects the 356-12-(New): Reject CMP 8 Fanel's Intent. SUBMITTER: R. S. Pinkerton, Los Angeles, CA VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 154 Change the, present Section 356-12 to 356-13 and ~dd a new 356-12 (under Part A) as follows: 356-12. Aligning and Sealing. Cellular metal floor raceways shall be so Installed that all sections which are used as . 353-2: Accept CMP 8 raceways for conductors are aligoed and joined to p~ovide a SUBMITTER: TSC-Approved for the Purpose smooth raceway free of sharp edges or foreign materials. I~TOPI~L-~.. 149 See the Technical Subco~ittee "Recommendations" Raceway Joints shall be sealed to prevent the entrance of water un--6"d~-F-tT~e definition of "Approved for the Purpose" in Article and concrete mix as soon as possible after the ducts are secured 100. in place. SUBSTANTIATION: See the TSC "findings" under the definition of SUBSTANTIATION: The ends of adjoining sections of cellular "Approved for the Purpose" in Article 100. metal floor raceways must be lined up to prevent insulation PANEL RECOMMENDATION: Accept as Revised: damage during the wire pulling process.. The design of cellular Delete the wOrds "unless approved for the purpose.". metal floor'does not assure alignment and there are no specific VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Code requirements for such an alignment. Accordingly, this has caused problems in enforcement. Also, the joints must be taped or sealed to prevent the entrance of water or concrete which t obviously can damage the conductor insulation when branch ARTICLE 354 -- UNDERFLOOR RACEWAYS circuits are installed. PANEL RECOMMENDATION: Reject. 354-2: Reject CMP 8 PANEL COMMENT: Proposal is prlmarily a design consideration. SUBMITTER: O. E. Dillon, Border County Div. IAE'I V'dTE ON PANEL RECOMMENDATION: 150 In the first sentence, add the word "only" after AFFIRMATIVE: 14. "permitted." In the third sentence, delete the word NEGATIVE: Young. "severe." SUBSTANTIATION: The language is permissive and does not

155 352-1, Exception No. 1: Accept CMA° 8 restrict the use of underfloor raceways. See the attached SUBMITTER: TSC-Approved for the Purpose op lnion* of the San Diego City Attorney. 144 See the Technical Subcommittee "Recommendations" • *See Border County Div. IAEI substantiation for proposal for un-"6Be'r--t-f~e definition of "Approved for the Purpose" in Article 110-16(a). 100. PANEL RECO~ENDATION: Reject. SUBSTANTIATION: See the TSC "findings" under the definition of PANEL COMMENT: The present wording adequately reflects the "Approved for the Purpose" in Article 100. P'Enel's Intent. PANEL RECOI~ENDATION: ~ccept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Delete the words "approved for the purpose" and add at the end of the exception: "where identified for such use." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 354-15: Accept CMP 8 SUBMITTER: TSC-Approvedfor the Purpose PKUPOSAL: 151 See the Technical Subcommittee "Recommendations" 352-8: Accept CMP 8 un--n-d'e~-ElTe definitli)n of "Approved for the Purpose" in Article SUBMITTER: TSC-Approved for the Purpose 100. 145 See the Technical Subcommittee "Recommendations" SUBSTANTIATION: See the TSC "findings" under the definition of definition of "Approved for the Purpose" in Article "Approved for the Purpose" in Article 100. 100. P.A.NEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: See the TSC "findings" under the definition of J Deletethe words "approved for the purpose" and add "approved" "Approved for the Purpose" in Article 100. before the word "fittings." PANEL RECO~ENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. •"Delete the words "approved for the purpose for'which they are used" and add the words "identified for such use." VOTE ON PANEL REC~NDATION: Unanimously Affirmative. r ARTICLE 356 -- CELLULAR METAL FLOOR RACEWAYS

155 EXPLANATION OF VOTE: ARTICLE 362 -- WIREWAYS YOUNG: The Code is not considered to be a design standard but in my opinion to require a product to be properly protected from 362-5: Accept CMP 8 damage through transit and installation is not a design SUBMITTER: CMP 8 requirement. PROPOSAL: 158A Revise section to read as follows: Wireways ~t contain more than 30 current-carrying conductors at any cross section. Conductors for signaling circuits or controller conductors between a motor and its starter and used 356-12-(New): Reject CMP 8 only for starting duty shall not be considered as current- SUBMITTER: Southwestern Section IAEI carrying conductors. I~ROP-O-S'AI~-~.• 155 Change the present Section 356-12 to 356-13 and The sum~o~ the cross-sectional areas of all contained ~w 356-12 (under part A) to read: conductors at any cross section of the wireway shall not exceed 356-12. Aligning and Sealing. Cellular metal floor raceways 20 percent of the interior cross-sectional area of the wireway. shall be so installed that all sections which are used as The derating factors specified in Note 8 to Tables 310-16 raceways for conductors are aligned and joined to provide a through 310-19 shall not be applicable to the 30 L smooth raceway free of sharp edges or foreign materials. current-carrying conductors at 20 percent fil] specified above. Raceway joints shall be sealed to prevent the entrance of water Exception No. l: Where the derating factors specified in Note ,and concrete mix as soon as possible after the ducts are secured 8 of Table 3]0-]6 through 310-19 are applied, the number of in place. current-carrying conductors shall not be limited but the sum of SUBSTANTIATION: The ends of adjoining sections of, cellular the cross-sectional area of all contained conductors at any metal floor raceways must be lined up to prevent insulation cross section of the wireway shall not e~ceed 20 percent of the damage during the wire pulling process. The design of cellular interior cross-sectlonal area of the wireway. metal floor does not assure alignment and there are no specific Exception No. 2: As provided in Section 520-5, the 30 Code requirements for such an alignment. Accordingly, this has conductor limitation does not apply for theaters and similar caused problems in enforcement. Also the Joints must be taped locations. or sealed to prevent the entrance of water or concrete which Exception No. 3: As provided in Section 620-32, the 20 percent obviously can damage the conductor insulation when branch fill limitation does not apply for elevators and dumbwaiters. circuits are installed. SUBSTANTIATION: Clarificat!on. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: Proposal is primaril~ a design consideration. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 14. NEGATIVE: Young. EXPLANATION OF VOTE: 362-5: Reject CMP 8 YOUNG: See comments for Proposal No. 154. SUBMIT~ 8 PROPOSAL: 15BB Revise section to read as follows: The number ~ctors permitted in a wireway shall be such that the sum of the cross-sectional area of the contained conductors shall ARTICLE 358 -- CELLULAR CONCRETE FLOOR P,ACEWAYS not exceed 20 percent fill of the wireway. The deratihg factors specified in Note 8 of Tables 310-16 through 310-19 shall not be 358-4: Accept CMP 8 applicable to the current-carrying conductors in wireways. SUBMITTER: TSC-Approved for the Purpose Exception: As provided in Section 620-32, the 20 percent fill !sI~3~-AL-~." 156 See the Technical Subcommittee "Recommendations" limitation does not apply for elevators and dumbwaiters. unOer the definition of "Approved for the Purpose" in Article SUBSTANTIATION: Clarification. 100. PANEL MECOMMEMDATION: Reject. SUBSTANTIATION: See the TSC "findings" unde~ the definition of PANEL COMMENT: See Panel action on Proposal No. 158A. "Approved for the Purpose" in Article 100; VOlt UN PANEL RECOM~MENDATION: Unanimously Affirmative./ PANEL RECOMMENDATION: Accept as Revised: Delete the words "approved for the purpose" and add "approved" before the word "fittings~". VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 362-10: Accept . CMP 8 SUBMITTER: H. F. van der Vonrt Cleveland, Ohio I~TOIIO'S'AL-~.• 15g Insert: "rigid nonmetallic conduit" after ~diate n~tal conduit." Then add new sentence at end of 358-12-(New): Reject CMP 8 section to read: "Where rigid nonmetallic conduit is used, SUBMII-rER: R. S. Pinkerton, Los Angeles, CA connection of equipment grounding conductors in the rigid 157 Add a •new section as follows: nonmetalllc~condult to the wireway shall comply with Sections ~'3~r~I-2"7-. Aligning and Sealing. Cellular concrete floor raceways 250-113 and 250-118." shall be so installed that all sections used as raceways for SUBSTANTIATION: This use of rigid nonmetallic conduit is now conductors are aligned and joined to provide a smooth raceway acceptable under Article 347. The change in Article 362 will free of sharp edges or foreign materials. RacewayJoints shall bring it into conformity with other parts of the Code. be sealed to prevent the entrance of water and concrete mix as PANEL RECOMMENDATION: Accept. soon as possible after the ducts are secured in place. VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. SUBSTANTIATION: The ends of adjoining sections of cellular concrete floor raceway must be lined up to prevent insulation damage during the wire pulling process. The design of cellular 362-11-(New): Reject CMP 8 concrete floor raceway does not assure alignment and there are SUBMII'TER: R. S. Pinkerton, Los Angeles, CA no specific Code requirements for such'an alignment. 160 Add a new section as follows: Accordingly, this has caused problems in enforcement. Also, the ~.. Posltion. Wi~eways may be installed wlth the cover joints must be taped or sealed to prevent the entrance of water face in a downward position provided suitable supports for or concrete which obviously can damage the conductor insulation conductors are installed therein at points not more than 3 feet when branch circuits are installed. apart. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: In the definition of a wireway In Section 362-1 PANEL COMMENT: Proposal is primarily a design consideration. appears the statement "In which conductors are laid in place VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. after the wireway has beeh installed." Thls In~)lies and has been interpreted ~o n~an that wireways must be installed with the cover on the'side or top for conductors to be laid in 358-12-(New): Reject CMP 8 place. But in many applications, this is an impracticle SUBMITTER: Southwestern Section IAEI position. Where conductors have sultable Insulatlng supports, PROPOSAL: 158 they can be positioned in a wireway with the cpver facing down ~rS"l~'1-'~T-.Aligning and Sealing. Cellular concrete floor raceways without danger of damaging the conductor insulation. This shall be so installed that all sections used as raceways for provision has been permitted in the City of Los Angeles for many conductors are aligned and Joined to provide a smooth raceway years with no reported failures. free of sharp edges or foreign materials. RacewayJoints shall PANEL RECOMMENDATION: Reject. be sealed to prevent the entrance of water and concrete mix as PANEL COMMENT: Such practice is not prohibited by present Code. soon as possible after the ducts are secured in place. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: The ends of adjoining section of cellular concrete floor raceway must be lined up to prevent insulation damage during the wire pulling process. The design of cellular concrete floor raceways does not assure alignment and there are 362-12-(New): Reject CMI~ 8 no specific Code requirements for such an alignment. SUBMITTER: R. S. Pinkerton, Los Angeles, CA Accordingly, this has caused problems in enforcement. Also, the PROPOSAL: 161 Add a new section as follows: joints must be taped or sealed to prevent the entrance ~f water ~'~-~T~-.Working Space. At least 12 inches of working space or concrete which obviously can damage the conductor insulation shall be provided between the cover of a wireway and walls, when branch circuits are installed. ceilings or similar obstructions. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: The intent of this requirement is to provide a PANEL COMMENT: Proposal is primarily a design consideration. safe work environment for electricians who will be performing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. maintenance work or making additions to existing wireway

156 EXPLANATION OF VOTE: ARTICLE 362 -- WIREWAYS YOUNG: The Code is not considered to be a design standard but in my opinion to require a product to be properly protected from 362-5: Accept CMP 8 damage through transit and installation is not a design SUBMITTER: CMP 8 requirement. PROPOSAL: 158A Revise section to read as follows: Wireways ~t contain more than 30 current-carrying conductors at any cross section. Conductors for signaling circuits or controller conductors between a motor and its starter and used 356-12-(New): Reject CMP 8 only for starting duty shall not be considered as current- SUBMITTER: Southwestern Section IAEI carrying conductors. I~ROP-O-S'AI~-~.• 155 Change the present Section 356-12 to 356-13 and The sum~o~ the cross-sectional areas of all contained ~w 356-12 (under part A) to read: conductors at any cross section of the wireway shall not exceed 356-12. Aligning and Sealing. Cellular metal floor raceways 20 percent of the interior cross-sectional area of the wireway. shall be so installed that all sections which are used as The derating factors specified in Note 8 to Tables 310-16 raceways for conductors are aligned and joined to provide a through 310-19 shall not be applicable to the 30 L smooth raceway free of sharp edges or foreign materials. current-carrying conductors at 20 percent fil] specified above. Raceway joints shall be sealed to prevent the entrance of water Exception No. l: Where the derating factors specified in Note ,and concrete mix as soon as possible after the ducts are secured 8 of Table 3]0-]6 through 310-19 are applied, the number of in place. current-carrying conductors shall not be limited but the sum of SUBSTANTIATION: The ends of adjoining sections of, cellular the cross-sectional area of all contained conductors at any metal floor raceways must be lined up to prevent insulation cross section of the wireway shall not e~ceed 20 percent of the damage during the wire pulling process. The design of cellular interior cross-sectlonal area of the wireway. metal floor does not assure alignment and there are no specific Exception No. 2: As provided in Section 520-5, the 30 Code requirements for such an alignment. Accordingly, this has conductor limitation does not apply for theaters and similar caused problems in enforcement. Also the Joints must be taped locations. or sealed to prevent the entrance of water or concrete which Exception No. 3: As provided in Section 620-32, the 20 percent obviously can damage the conductor insulation when branch fill limitation does not apply for elevators and dumbwaiters. circuits are installed. SUBSTANTIATION: Clarificat!on. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: Proposal is primaril~ a design consideration. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 14. NEGATIVE: Young. EXPLANATION OF VOTE: 362-5: Reject CMP 8 YOUNG: See comments for Proposal No. 154. SUBMIT~ 8 PROPOSAL: 15BB Revise section to read as follows: The number ~ctors permitted in a wireway shall be such that the sum of the cross-sectional area of the contained conductors shall ARTICLE 358 -- CELLULAR CONCRETE FLOOR P,ACEWAYS not exceed 20 percent fill of the wireway. The deratihg factors specified in Note 8 of Tables 310-16 through 310-19 shall not be 358-4: Accept CMP 8 applicable to the current-carrying conductors in wireways. SUBMITTER: TSC-Approved for the Purpose Exception: As provided in Section 620-32, the 20 percent fill !sI~3~-AL-~." 156 See the Technical Subcommittee "Recommendations" limitation does not apply for elevators and dumbwaiters. unOer the definition of "Approved for the Purpose" in Article SUBSTANTIATION: Clarification. 100. PANEL MECOMMEMDATION: Reject. SUBSTANTIATION: See the TSC "findings" unde~ the definition of PANEL COMMENT: See Panel action on Proposal No. 158A. "Approved for the Purpose" in Article 100; VOlt UN PANEL RECOM~MENDATION: Unanimously Affirmative./ PANEL RECOMMENDATION: Accept as Revised: Delete the words "approved for the purpose" and add "approved" before the word "fittings~". VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 362-10: Accept . CMP 8 SUBMITTER: H. F. van der Vonrt Cleveland, Ohio I~TOIIO'S'AL-~.• 15g Insert: "rigid nonmetallic conduit" after ~diate n~tal conduit." Then add new sentence at end of 358-12-(New): Reject CMP 8 section to read: "Where rigid nonmetallic conduit is used, SUBMII-rER: R. S. Pinkerton, Los Angeles, CA connection of equipment grounding conductors in the rigid 157 Add a •new section as follows: nonmetalllc~condult to the wireway shall comply with Sections ~'3~r~I-2"7-. Aligning and Sealing. Cellular concrete floor raceways 250-113 and 250-118." shall be so installed that all sections used as raceways for SUBSTANTIATION: This use of rigid nonmetallic conduit is now conductors are aligned and joined to provide a smooth raceway acceptable under Article 347. The change in Article 362 will free of sharp edges or foreign materials. RacewayJoints shall bring it into conformity with other parts of the Code. be sealed to prevent the entrance of water and concrete mix as PANEL RECOMMENDATION: Accept. soon as possible after the ducts are secured in place. VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. SUBSTANTIATION: The ends of adjoining sections of cellular concrete floor raceway must be lined up to prevent insulation damage during the wire pulling process. The design of cellular 362-11-(New): Reject CMP 8 concrete floor raceway does not assure alignment and there are SUBMII'TER: R. S. Pinkerton, Los Angeles, CA no specific Code requirements for such'an alignment. 160 Add a new section as follows: Accordingly, this has caused problems in enforcement. Also, the ~.. Posltion. Wi~eways may be installed wlth the cover joints must be taped or sealed to prevent the entrance of water face in a downward position provided suitable supports for or concrete which obviously can damage the conductor insulation conductors are installed therein at points not more than 3 feet when branch circuits are installed. apart. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: In the definition of a wireway In Section 362-1 PANEL COMMENT: Proposal is primarily a design consideration. appears the statement "In which conductors are laid in place VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. after the wireway has beeh installed." Thls In~)lies and has been interpreted ~o n~an that wireways must be installed with the cover on the'side or top for conductors to be laid in 358-12-(New): Reject CMP 8 place. But in many applications, this is an impracticle SUBMITTER: Southwestern Section IAEI position. Where conductors have sultable Insulatlng supports, PROPOSAL: 158 they can be positioned in a wireway with the cpver facing down ~rS"l~'1-'~T-.Aligning and Sealing. Cellular concrete floor raceways without danger of damaging the conductor insulation. This shall be so installed that all sections used as raceways for provision has been permitted in the City of Los Angeles for many conductors are aligned and Joined to provide a smooth raceway years with no reported failures. free of sharp edges or foreign materials. RacewayJoints shall PANEL RECOMMENDATION: Reject. be sealed to prevent the entrance of water and concrete mix as PANEL COMMENT: Such practice is not prohibited by present Code. soon as possible after the ducts are secured in place. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: The ends of adjoining section of cellular concrete floor raceway must be lined up to prevent insulation damage during the wire pulling process. The design of cellular concrete floor raceways does not assure alignment and there are 362-12-(New): Reject CMI~ 8 no specific Code requirements for such an alignment. SUBMITTER: R. S. Pinkerton, Los Angeles, CA Accordingly, this has caused problems in enforcement. Also, the PROPOSAL: 161 Add a new section as follows: joints must be taped or sealed to prevent the entrance ~f water ~'~-~T~-.Working Space. At least 12 inches of working space or concrete which obviously can damage the conductor insulation shall be provided between the cover of a wireway and walls, when branch circuits are installed. ceilings or similar obstructions. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: The intent of this requirement is to provide a PANEL COMMENT: Proposal is primarily a design consideration. safe work environment for electricians who will be performing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. maintenance work or making additions to existing wireway

156 installations. Maintenance electricians should have sufficient 364-5, Exception No. 2: Reject CMP 8 workspace in front of a wireway that they can look inside and SUBMII"rER: TSC-Approved for the Purpose examine the. condition of conductor insulation for splice PROPDSAL: 166 See the Technical Subcommittee "Recammendations" Insulation before pulling wires out of a wireway. Experience un--B-d-~-~--tITe definition of "Approved for the Purpose" in Article has shown'that conductor's insulation does become damaged and 100. the insulation on splices can open up Which can present a severe SUBSTANTIATION: See the TSC "findings" under the clefinitlon of shock hazard to people who reach into the wiroway while working "Approved for the Purpose" in Article 100. "blind". A 12 Inch minimum working space is a reasonable and PANEL RECOf~IENDATION: Reject. practical dimension and will greatly enhance safe working PANEL COMMENT: See Panel action on Proposal No. 165. conditions for maintenance electricians. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. PANEL RECOI~MENDATION: Reject. PANEL COMMENT: Already covered by Section llO-16. volt uN PANEL RECO~WIENDATION: Unanimously Affirmative. 364-8: Accept CMP 8 SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. IPRUPO~AL: 167 Add a sentence as follows: 362-12-(New): Reject CMP 8 ~le cord assembly connections may be made directly to the SUBMIl-rER: SouthwesternSection IAEI =load end terminals of a busway plug-ln device, providing the 162 connection includes a suitable tension take-up device on the Position. Wiroways may be installed with the cover cord. face in a downward position provided suitable supports for SUBSTANTIATION: Section 364-8 lists eight types of equipment conductors are installed therein at points not more than three permitted for connection to busway but contains no guidelines feet apart. for the make-up of such connections. In the case of cord SUBSTANTIATION: in the definition of a wlreway in Section 362-i assembly connections to busway plug-in devices, seekers of appears the statement "inwhich conductors are laid in place guidance may be drawn to 400-7(b). This paragraph is aimed after the wireway has been installed." This implies and has primarily at fixed location connections and requires a been interpreted to mean that wireways must be installed with receptacle outlet on the power supply plus an attachment plug on the cover on the side or top for conductors to be laid in the cord. place. But in many applications, this is an impractical Minimizes the possibility of unnecessary components being position. Where conductors have suitable insulating supports, incorporated in the connection. they can be positioned in a wireway with the cover facing down PANEL RECO~ENDATION: Accept. without danger of ,damaging the conductor insulation. This VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. provision has been permitted in the City of Los Angeles for many years with no reported failures. PANEL RECOf~4ENDATION: Reject. PANEL CO,WENT: Such practice is not prohibited by present Code. 364-8: Accept CMP VOTE ON PANEL RECO~4ENDATION: Unanimously Affirmative. SUBMITTER: H. F. van der Voort, Cleveland, Ohio ~KUPU3AL: 168 Add "rigid nonmetallic conduit" after ~diate,metal conduit." Then add now sentence at end of section,to read: "Where rigid nonmetallic conduit is used, 362-13-(New): Reject CMP 8 connection of equipment grounding conductors in the rigid SUBMITTER: Southwestern Section IAEI nonmetallic conduit to the wireway shall comply with Sections ]~TOI~O~TAI--~.• 163 250-113 and 250-118." ~3~"~[~-.Working Space. At least 12 inches of working space SUBSTANTIATION: This use of rigid nonmetallic conduit is' now shall be provided between the cover of a wiroway and walls,, acceptable under Article 347. The change in Article 364 will ceilings or similar obstructions. bring it into conformity with other parts of the Code. SUBSTANTIATION: The intent of this requirement is to provide a PANEL RECO~V~4ENDATION: Accept. Safe work environment for electricians wi~o will be performing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. maintenance work or making additions to existing wireway installations. Maintenance electricians should have sufficient workspace in front of a wiroway that they can look inside and ekamine the condition of conductor Insulation for splice 364L12: Reject CMP 8 insulation before pulling wires out of a wireway. Experience SUBMITTER: David J. Snitzer, City of Los Angeles Code Advisory has shown that conductor's insulatlon does become damaged and -the insulation on splices can open up which can present a severe PROPOSAL: 169 Add note as follows: shock hazard to people who reach into the wireway while working ~Overcurrent devices on busways shall be installed in 'blind'. A twelve inch minimum working space is a reasonable accordancewith the requirements of Section 380-8. and practical dimension and will greatly enhance safe working SUBSTANTIATION: Clarification. conditions for maintenance electricians. PANEL RECOMMENDATION: Reject. PANEL RECO~ENDATION: Reject. PANEL COMMENT: The cross reference is redundant. PANEL COf~ENT: Already covered by Section llO-16. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOtE ON PANEL RECOMMENDATION: Unanimously Affirmative.

364-12, FPN-(New): Reject CMP 8 ARTICLE 364 -- BUSWAYS SUBMII-fER: Southwestern Section IAEI HRUPU3AL: 170 Fine Print Note. 364-4(b): Accept CMP 8 ~rrent devices on busways shall be installed in SUBMITTER: TSC-Approved for the Purpose accordance,with the requirements of Section 3~-8. I}ITOI~-~.• 164 See the Technical Subcommittee "Reco~nendations" SUBSTANTIATION: Clarification. ~e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Reject. 100. PANEL COMMENT: See Panel Action on Proposal No. 169. SUBSTANTIATION: See the TSC "findings" under the definition of VOTE ON PANEL RECOF~IENDATION: Unanimously Affirmative. "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: I Delete the words "unless specifically approved for the purpose" and add "unless identified for such use." ARTICLE 365 -- CABLEBUS VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 365-2: Accept CMP 8 SUBMITTER: TSC-Approved for the Purpose HRUPU~AL: 171 See the Technical Subcofm~Ittee "Recommendations" 364-5, Exception No. 1: Accept CMP 8 ~e definition of "Approved for the Purpose" in Article SUBMITTER: TSC-Approved for the Purpose 100. ?ITOI~S'AL-~: 165 See the Technical Subcommittee "Reco~vnendations" SUBSTANTIATION: See the TSC "findings" under the definition of ~e definition of "Approved for the Purpose" in Article "Approved for the Purpose" in Article 100. 100. PANEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: See the TSC."findings" under the definition of Delete the words "approved for the purpose" and substitute "Approved for the Purpose" in Article 100. "identified for such use." PANEL RECOMMENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I Revise 364-5 of the NEC as follows: "Busways shall be securely supported at intervals not exceeding 5 feet unless otherwise designed and marked." Delete Exception Nos. I and 2. VOTE ON PANEL RECOMI~IENDATION:' Unanimously Affirmative. 365-8: Accept CMP ,8 SUBMITTER: TSC-Approved for the Purpose ]~l~-OIIiS-S~i~l~-~.• 172 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100.

157 ARTICLE 363 -- FLAT CABLE ASSEMBLIES (c) Electric-discharge lampholders of' the screw-shell type are mounted not less than 8 feet above the floor. 363-i: Accept ~ CMP 7 When the above conditions are met, fluorescent, mercury-vapor, SUBMITTER: TSC-Approved for the Purpose metal-halide, high-pressure sodium, low-pressure sodium and/or !bl~rOl~'X~-T.• 117 See the Tecl~nical Subcommittee "Reco~endations" incandescent fixtures may be supplied by 480/277 volt, grounded definition of "Approved for the Purpose" in Article wye circuit -- with loads connected phase-to-neutral and/or 100, phase-to-phase. Such circuits operate at 277 volts to ground - SUBSTANTIATION: See the TSC "findings" under the definition of that "is, not over 300 volts to ground -- even when 480 volt "Approved for the Purpose" in Article 100. ballasts are connected phase-to-phase. PANEL RECOMMENDATION: Accept as Revised: The present Code restricts the use of Flat Cable to Feeding I Delete "approved for the purpose." Fixtures with 277 volt ballasts. With the increasing demand for VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 480 ballast fixtures fed from a 480/277 grounded wye system it is sound engineering to revise the' Code as proposed to permit the wiring of 480 ballasts with Flat Cable. / PANEL RECOMMENDATION: Accept. 363:4: Accept CMP 7 VOTE ON PANEL"RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose l}ITOl~'AIL-~.• 118 See the Technical Subcommittee "Recommendations" un--n-d~-r-[ITe definition of "Approved for the Purpose" in Article 100. 363-10: Accept CMP 7 SUBSTANTIATION: See the TSC "findings" under the 'definition of SUBMITTER: TSC-Approved for the Purpose "Approved for the Purpose" in Article 100. 122 See the Technical Subcommittee "Recommendations" PANEL RECOMMENDATION: Accept as Revised: un-G~-d~-~--t'ffe definition of "Approved for the P~rpose" in Article, Delete "specifically approved for the purpose" in (1) and (4). 100. Insert "suitable for the application" in (I) and "identified for SUBSTANTIATION: See the TSC "findings'; under the definition of use in wet locations" in (4). "Approved for the Purpose" in Article 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised: Delete "approved for the purpose" and replace with "identified for the use.° VOTE ONPANEL RECOMMENDATION: Unanimously Affirmative, 363-5: Accept CMP 7 SUBMI1-TER: TSC-Approved for the Purpose ]~TOP-O-~Z:-." 119 See the Technical Subcommittee "Recommendations" un--n-d~--E~e definition of "Approved for the Purpose" in Article 363-11: Accept CMP 7 100. SUBMITTER: TSC-Approved for the Purpose SUBSTANTIATION: See the TSC "findings" under the definition of 123 See the Technical Subcommittee "Recommendations" "Approved for the Purpose" in Article 100. un--6-d-e~--t-~e definition of "Approved for the Purpose" In Article PANEL RECOMMENDATION: Accept as Revised: 100. Delete "approved for the purpose" and insert "identified for SUBSTANTIATION: See the TSC "findings" under the definition of the use." "Approved for the Purpose" in Article 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECO~MENDATION: Accept as Revised: Delete "approved ~or the purpose" in both paragraphs and replace with "identified for the use." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 363-9: Accept CMP 7 SUBMITTER: S.J. Casasanta, West Hartford, CT 120 Revise as follows: ~s shall be made in approved Junction boxes using 363-12~ Accept CMP 7 approved wiring methods. SUBMITTER: CMP 7 SUBSTANTIATION: Use of approved terminal blocks has proved $1R-OIIO-S'A-L-~. 123A Delete "approved for the purpose~ and replace tedious and time-consuming. Many installations have been made w-Tt'h--~T~entifled for the use." where standard approved wiring methods, such as wire nuts, were SUBSTANTCATION: To comply with TSC on Approved for the Purpose permitted by the local inspector. recommendatlons. Individual conductors of flat cable have been identified with PANEL RECOI~MENDATION: Accept. imprinted marking to assure that phases are properly connected. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. The imprint marking will substitute for the color code marking on the terminal block. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 363-14: Accept CMP 7 SUBMITTER: S.J, Casasanta, West Hartford, CT 124 Revise as follows: All extensions from flat cabl@ assemblies shall be made by 363-10: Accept CMP 7 approved wiring methods, within the Junction boxes, installed at SUBMITTER: S.J. Casasanta, West Hartford, CT either end of the flat cable assembly runs. PROPOSAL: 121 Revise as follows: SUBSTANTIATION: Use of terminal blocks has proved tedious and a--~hall be made between any phase conductor and the neutral time-consuming. Standard approved wiring methods such as wire or any other phase conductor by means of devices and fittings nuts have been used and permitted by the local inspector. approved for the purpose. Tap devices shall be rated at not Individual conductors of flat cable have.been 'identified with less than 15 amperes or more than 300 volts and they shall be imprinted marking to assure that phases are properly connected. color-coded in accordance with the requirements of Section The imprint marking wlll substitute for the color code marking 1363_2o . . . on the terminal block. • ~UBSTANTIATION: PANEL RECOMMENDATION: Accept. Section 210-6. Permits branch circuits with voltages not VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. exceeding 300 volts to ground per the following: (a) Voltage to Ground.... Exception No. 1: The voltage shall not exceed 300 volts to ground on branch circuits in industrial establishments where all 363-14: Accept CMP 7 of the following condi¢ions are met: SUBMITTER: TSC-Approved for the Purpose (a) The conditions of maintenance and supervision indicate PITOPO-~-~.'125 See the Technical Subcommittee "Recommendations" that only qualified persons will service the lighting fixtures. un-GB-d'e-~"~Te definition of "Approved for the Purpose" in Article (b) The branch circuits supply only lighting fixtures that i00. are equipped with mogul-base screw-shell lampholders or with SUBSTANTIATION: See the TSC "findings" under the definition of l ampholders of other types approved for the purpose. =Approved for the Purpose" in Article 100. (c) The fixtures are mounted not less than 8 feet above the PANEL RECOMMENDATION: Accept as Revised: floor. I Delete second sentence. (d) Integral lighting switch, if used, shall not be readily VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. accessible. Exception No. 2: The voltage shall not exceed 300 volts to ground on branch circuits in industrial establishments, stores, health care facilities, office buildings, schools, or public and 363-15: Accept CMP 7 commercial areas of other buildings such as hotels or SUBMITTER: C'MP 7 transportation terminals where all of the following conditions I PROPOSAL: 125A Insert a period after "raceways" and delete are mot. remalnder of the first sentence. (a) The branch circuits supply only the ballasts for SUBSTANTIATION: To comply.with TSC on Approved for the Purpose electric-discharge lamps mounted in permanently installed reco~ndations. fixtures. PANEL RECOMMENDATION: Accept. (b) The fixtures do not have manual swi,tch control, as an VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. integral part of the fixture.

132 363-18: Accept CMP 7 additions, deletions and moves. Even with raised floors two or SUBMITTER: TSC-Approved for the Purpose more feet above structural (true) floors It is difficult to get 126 See the Technical Subcommittee "Recommendations" enough pipe' In an installation to satisfy such needs. Use of un--fi-dE~--t'F~e definition of "Approved for the Purpose" in Article multiple runs of unpunched metal wlreway with hinged metal I00. covers and side mounted* metal outlet boxes has proved the most SUBSTANTIATION: See the TSC "findings" under the definition of practical way of handling large numbers of branch circuit "Approved for the Purpose" in Article 100. conductors in the relatively confined space under raised floors PANEL RECOYAMENDATION: Accept as Revised: in facilities ndt presently subject to the National Electrical I Delete "approved for the purpose" and replace with "identified Code. Supporting raceway off the floor minimizes problems for the use." related to dirt accumulation and accidental water spills. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Inclusion of intermediate metal conduit was made to cover this newly listed material while metal clad cable appears as useful as other metallic cable types. ~ *Note: Side mounting of boxes allows horizontal mounting of 363-20: Accept CMP 7 receptacles which eliminates dirt collecting in up-facing SUBMITTER: TSC-Approved for the Purpose receptacles. I~ITOI~O~'AL-~.• 127 See the Technical Subcommittee "Recon~mendations" PANEL RECOMMENDATION: Accept as Revised: un--n'd-6~-tT~ definition of "Approved for the Purpose" in Article Delete "copper-sheathed cable," "aluminum-sheathed cable," the 100. last sentence, and the exception. SUBSTANTIATION: See the TSC "findings" under the definition of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. "Approved for the Purpose" in Article 100. - \ PANEL RECOMMENDATION: Accept as Revised:

Delete "approved for the purpose" and replace with "identified o for the'use." 645-2(c)(2): Accept CMP 7 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: R. Bezdegian, Shrewsbury, MA PRI]PI)~'A~-F: 132 Add "Type AC cable." ~'I]~'~'AI~rIATION: Type AC cable is suitable for this use and is more readlly obtainable then Type MC. It is permitted by Section 300-22(c) above ceilings used for air-handling. Why not under raised floors. It'could withstand physical injury, much ARTICLE 366 -- ELECTRICAL FLOOR ASSEMBLIES the same as Type MC, flexible metal conduit, liquidtight. flexible metal conduit, or data processing equipment cables. 366-6: Accept CMP 7 PANEL RECOMMENDATION: Accept. SUBMIITTER: TSC-Nominal Voltage VOTE ON PANEL RECOMMENDATION: l l~TOl~S'~-~. 128 Add "nominal" after "120 volts." AFFIRMATIVE: g. ~I~%"FA]~TIATION: Change recommended for clarification and to NEGATIVE: Sappington, Bowen, Hart. 6btain conformance with present practice and uniformity within EXPLANATION OF VOTE: the Code. ~APPIRGIDN: I do not feel sufficient supporting comment has PANEL RECOI~MENDATION: Accept. been submitted. I feel there is a real Question relative to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. terminations and mechanical execution, therefore, in order to minimize potential fires resulting from same, said proposal should not be accepted. BOWEN: I am voting negative.° I do not feel that under raised 366-20(b)(1): Reject CMP 7 floors is as acceptable as above ceilings. Also the termination SUBMITTER: TSC-Nominal Voltage difference. !MTOI~TS'AL-T 129 Revise as follows: HART: I do not believe that there is sufficient supporting rated voltage and current. • comment to accept this Proposal. Even though there are some SUBSTANTIATION: Change recommended for clarification and to similarities between Type AC cable and those listed in the obtain conformance with present practice and uniformity within "substantiation," there is a considerable difference in the the Code. terminations. I see no need to include Type AC cable in this PANEL RECOMMENDATION: Reject. section. PANEL UOMMENT: The present wording adequately reflects the Panel's intent. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 645-3: Accept CMP 7 SUBMITTER: Southwestern Section IAEI PKUPU~AL: 133 Change the word "electric" to "electronic data processing" in Subparagraph (a); SUBSTANTIATION: There are certain associated functions carried ARTICLE 645 -- DATA PROCESSING SYSTEMS out in data processing rooms whic~ e~)loy electric typewriters, adding machines, calculators, etc., and this equipment Js not 645-I: Accept ~P 7 part of the data'processing system. Under this present Code Secretary's Note: It was the action of the Correlating wording, these appliances must be capable of being disconnected Committee that the Panel clarify the Panel Recommendation with along with the computer equipment. Furthermore; the present regard to original Proposal. [ phrase "electric equipment in the room" can include fire. warning SUBMITTER: H. K. Glenn, Pacific Coast Electrical Assn. systems and fire suppression systems. It appears from the I~TOI}~5"AL-~.• 130 Delete the word "including" and replace with the statements made in NFPA 75 dealing with protection of electronic ~ther than." computers and data processing equipment that the Intent is to SUBSTANTIATION: There are misinterpretations of this section. disconnect the electronic equipment rather than other appliances It is unrealistic and we do not believe it was the intent of the or systems in the'room. The wording of the Code should reflect Panel to include in the requirements under Section 645-i the this intent. remote telephone terminal units and cash registers in PANEL RECOMMENDATION: Accept as Revised: supermarkets and other similar small terminals. Replace existing Section 645z3 with the following paragraph: PANEL RECOMMENDATION: Accept as Revised! 645-3. Disconnecting Means. A disconnecting means shall be Add the words "in a data p~ocessing, room" at the end of provided to disconnect the power to all electronic equipment in Section 645-1. the computer room. This disconnecting means shall be controlled VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. from locations readily accessible tothe operator at the principal exit doors. There shall also be a similar disconnecting means to disconnect the air-conditioning system serving this area. 645-2(c)(2):""" - Accept CMP 7 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: D. C. Smith, Sperry Univac IMTOI~'IE~.- 131 Revise as follows: ~e branch circuit supply conductors to receptacles are in rigid metal conduit, intermediate metal conduit, electrical 645-3(a): Reject CMP 7 metallic tubing, metal wireway, metal surface raceway with metal SUBMITTER: R. S. Pinkerton, Los Angeles, CA cover, flexible metal conduit, liquidtight flexible metal I~TOI~S'AL-~. 134 Delete the word "electric" and replace with the conduit, copper-sheathed cable, mineral-insulated metal-sheathed wor--6-F-d-~EFectronic., cable, aluminum-sheathed cable, or metal clad cable. Wireway or SUBSTANTIATION: There are certain associated functions carried metal surface raceway, when-used, shall be mounted with a out in data processing rooms which employ electric typewriters, minimum clearance of 1 1/2 inches between the structural (true) adding machines, calculators, etc., and this equipment is not floor and the bottom of the raceway. part of the data processing system. Under this present Code Exception: Wireway or metal surface raceway, so long as wording, these appliances must be capable of being disconnected wiring method is exposed. along with the computer equipment. Furthermore, the present SUBSTANTIATION: Large electronic data processing systems often phrase "electric equipment in the room" can include fire wa~ning require 200 to 600 or occasionally more branch circuit systems and fire suppression systems. It appears from the conductors in a single room. Many such facilities undergo statements made in NFPA 75 dealing with protection of electronic frequent changes in EDP hardware with associated branch circuit computers and data processing equipment that the intent is to

133 installations. Maintenance electricians should have sufficient 364-5, Exception No. 2: Reject CMP 8 workspace in front of a wireway that they can look inside and SUBMII"rER: TSC-Approved for the Purpose examine the. condition of conductor insulation for splice PROPDSAL: 166 See the Technical Subcommittee "Recammendations" Insulation before pulling wires out of a wireway. Experience un--B-d-~-~--tITe definition of "Approved for the Purpose" in Article has shown'that conductor's insulation does become damaged and 100. the insulation on splices can open up Which can present a severe SUBSTANTIATION: See the TSC "findings" under the clefinitlon of shock hazard to people who reach into the wiroway while working "Approved for the Purpose" in Article 100. "blind". A 12 Inch minimum working space is a reasonable and PANEL RECOf~IENDATION: Reject. practical dimension and will greatly enhance safe working PANEL COMMENT: See Panel action on Proposal No. 165. conditions for maintenance electricians. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. PANEL RECOI~MENDATION: Reject. PANEL COMMENT: Already covered by Section llO-16. volt uN PANEL RECO~WIENDATION: Unanimously Affirmative. 364-8: Accept CMP 8 SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. IPRUPO~AL: 167 Add a sentence as follows: 362-12-(New): Reject CMP 8 ~le cord assembly connections may be made directly to the SUBMIl-rER: SouthwesternSection IAEI =load end terminals of a busway plug-ln device, providing the 162 connection includes a suitable tension take-up device on the Position. Wiroways may be installed with the cover cord. face in a downward position provided suitable supports for SUBSTANTIATION: Section 364-8 lists eight types of equipment conductors are installed therein at points not more than three permitted for connection to busway but contains no guidelines feet apart. for the make-up of such connections. In the case of cord SUBSTANTIATION: in the definition of a wlreway in Section 362-i assembly connections to busway plug-in devices, seekers of appears the statement "inwhich conductors are laid in place guidance may be drawn to 400-7(b). This paragraph is aimed after the wireway has been installed." This implies and has primarily at fixed location connections and requires a been interpreted to mean that wireways must be installed with receptacle outlet on the power supply plus an attachment plug on the cover on the side or top for conductors to be laid in the cord. place. But in many applications, this is an impractical Minimizes the possibility of unnecessary components being position. Where conductors have suitable insulating supports, incorporated in the connection. they can be positioned in a wireway with the cover facing down PANEL RECO~ENDATION: Accept. without danger of ,damaging the conductor insulation. This VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. provision has been permitted in the City of Los Angeles for many years with no reported failures. PANEL RECOf~4ENDATION: Reject. PANEL CO,WENT: Such practice is not prohibited by present Code. 364-8: Accept CMP VOTE ON PANEL RECO~4ENDATION: Unanimously Affirmative. SUBMITTER: H. F. van der Voort, Cleveland, Ohio ~KUPU3AL: 168 Add "rigid nonmetallic conduit" after ~diate,metal conduit." Then add now sentence at end of section,to read: "Where rigid nonmetallic conduit is used, 362-13-(New): Reject CMP 8 connection of equipment grounding conductors in the rigid SUBMITTER: Southwestern Section IAEI nonmetallic conduit to the wireway shall comply with Sections ]~TOI~O~TAI--~.• 163 250-113 and 250-118." ~3~"~[~-.Working Space. At least 12 inches of working space SUBSTANTIATION: This use of rigid nonmetallic conduit is' now shall be provided between the cover of a wiroway and walls,, acceptable under Article 347. The change in Article 364 will ceilings or similar obstructions. bring it into conformity with other parts of the Code. SUBSTANTIATION: The intent of this requirement is to provide a PANEL RECO~V~4ENDATION: Accept. Safe work environment for electricians wi~o will be performing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. maintenance work or making additions to existing wireway installations. Maintenance electricians should have sufficient workspace in front of a wiroway that they can look inside and ekamine the condition of conductor Insulation for splice 364L12: Reject CMP 8 insulation before pulling wires out of a wireway. Experience SUBMITTER: David J. Snitzer, City of Los Angeles Code Advisory has shown that conductor's insulatlon does become damaged and -the insulation on splices can open up which can present a severe PROPOSAL: 169 Add note as follows: shock hazard to people who reach into the wireway while working ~Overcurrent devices on busways shall be installed in 'blind'. A twelve inch minimum working space is a reasonable accordancewith the requirements of Section 380-8. and practical dimension and will greatly enhance safe working SUBSTANTIATION: Clarification. conditions for maintenance electricians. PANEL RECOMMENDATION: Reject. PANEL RECO~ENDATION: Reject. PANEL COMMENT: The cross reference is redundant. PANEL COf~ENT: Already covered by Section llO-16. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOtE ON PANEL RECOMMENDATION: Unanimously Affirmative.

157 installations. Maintenance electricians should have sufficient 364-5, Exception No. 2: Reject CMP 8 workspace in front of a wireway that they can look inside and SUBMII"rER: TSC-Approved for the Purpose examine the. condition of conductor insulation for splice PROPDSAL: 166 See the Technical Subcommittee "Recammendations" Insulation before pulling wires out of a wireway. Experience un--B-d-~-~--tITe definition of "Approved for the Purpose" in Article has shown'that conductor's insulation does become damaged and 100. the insulation on splices can open up Which can present a severe SUBSTANTIATION: See the TSC "findings" under the clefinitlon of shock hazard to people who reach into the wiroway while working "Approved for the Purpose" in Article 100. "blind". A 12 Inch minimum working space is a reasonable and PANEL RECOf~IENDATION: Reject. practical dimension and will greatly enhance safe working PANEL COMMENT: See Panel action on Proposal No. 165. conditions for maintenance electricians. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. PANEL RECOI~MENDATION: Reject. PANEL COMMENT: Already covered by Section llO-16. volt uN PANEL RECO~WIENDATION: Unanimously Affirmative. 364-8: Accept CMP 8 SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. IPRUPO~AL: 167 Add a sentence as follows: 362-12-(New): Reject CMP 8 ~le cord assembly connections may be made directly to the SUBMIl-rER: SouthwesternSection IAEI =load end terminals of a busway plug-ln device, providing the 162 connection includes a suitable tension take-up device on the Position. Wiroways may be installed with the cover cord. face in a downward position provided suitable supports for SUBSTANTIATION: Section 364-8 lists eight types of equipment conductors are installed therein at points not more than three permitted for connection to busway but contains no guidelines feet apart. for the make-up of such connections. In the case of cord SUBSTANTIATION: in the definition of a wlreway in Section 362-i assembly connections to busway plug-in devices, seekers of appears the statement "inwhich conductors are laid in place guidance may be drawn to 400-7(b). This paragraph is aimed after the wireway has been installed." This implies and has primarily at fixed location connections and requires a been interpreted to mean that wireways must be installed with receptacle outlet on the power supply plus an attachment plug on the cover on the side or top for conductors to be laid in the cord. place. But in many applications, this is an impractical Minimizes the possibility of unnecessary components being position. Where conductors have suitable insulating supports, incorporated in the connection. they can be positioned in a wireway with the cover facing down PANEL RECO~ENDATION: Accept. without danger of ,damaging the conductor insulation. This VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. provision has been permitted in the City of Los Angeles for many years with no reported failures. PANEL RECOf~4ENDATION: Reject. PANEL CO,WENT: Such practice is not prohibited by present Code. 364-8: Accept CMP VOTE ON PANEL RECO~4ENDATION: Unanimously Affirmative. SUBMITTER: H. F. van der Voort, Cleveland, Ohio ~KUPU3AL: 168 Add "rigid nonmetallic conduit" after ~diate,metal conduit." Then add now sentence at end of section,to read: "Where rigid nonmetallic conduit is used, 362-13-(New): Reject CMP 8 connection of equipment grounding conductors in the rigid SUBMITTER: Southwestern Section IAEI nonmetallic conduit to the wireway shall comply with Sections ]~TOI~O~TAI--~.• 163 250-113 and 250-118." ~3~"~[~-.Working Space. At least 12 inches of working space SUBSTANTIATION: This use of rigid nonmetallic conduit is' now shall be provided between the cover of a wiroway and walls,, acceptable under Article 347. The change in Article 364 will ceilings or similar obstructions. bring it into conformity with other parts of the Code. SUBSTANTIATION: The intent of this requirement is to provide a PANEL RECO~V~4ENDATION: Accept. Safe work environment for electricians wi~o will be performing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. maintenance work or making additions to existing wireway installations. Maintenance electricians should have sufficient workspace in front of a wiroway that they can look inside and ekamine the condition of conductor Insulation for splice 364L12: Reject CMP 8 insulation before pulling wires out of a wireway. Experience SUBMITTER: David J. Snitzer, City of Los Angeles Code Advisory has shown that conductor's insulatlon does become damaged and -the insulation on splices can open up which can present a severe PROPOSAL: 169 Add note as follows: shock hazard to people who reach into the wireway while working ~Overcurrent devices on busways shall be installed in 'blind'. A twelve inch minimum working space is a reasonable accordancewith the requirements of Section 380-8. and practical dimension and will greatly enhance safe working SUBSTANTIATION: Clarification. conditions for maintenance electricians. PANEL RECOMMENDATION: Reject. PANEL RECO~ENDATION: Reject. PANEL COMMENT: The cross reference is redundant. PANEL COf~ENT: Already covered by Section llO-16. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOtE ON PANEL RECOMMENDATION: Unanimously Affirmative.

157 SUBSTANTIATION: See the TSC "findings" under the definition of Chapter 9 Table l, Note 5: Accept CMP 8 "Approved for the Purpose" in Article 100. SUBMITTER! CMP 8 PANEL RECOMMENDATION: Accept as Revised: !aITOPOS'7~-~.• 175A Add to Note 5 the word "maximum" before I Delete the words "approved for the purpose" and add the word ~e." Add FPN after Note 5 to read: "Approved" at the the beginning of the sentence. Table l is based on common conditions of proper cabling and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. alignment of conductors where the length of the pull and the number of bends are within reasonable limits. It should be recognized that for unusual conditions a larger size conduit or a lesser conduit fill should be considered. ARTICLE 374 -- AUXILIARY GUTTERS SUBSTANTIATION: Clarification. PANEL RECOMMENDATION: Accept. 374-9(f)-(New): Reject CMP 8 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: S. D. Mauney, Carolina Power & Light Company PHUPU~AL: 173 Add new (f) as follows: -~here an auxiliary gutter is to contain bends or taps to an electric supplier's service conductors larger than No. i AWG, Table l, Chapter g: Reject CMP 8 its width at the cover shall be at least 200 percent of that SUBMITTER: CMP 8 given in Table 373-6(a) and its minimum depth from cover to back 175B In the 3 conductor column, delete 40 (percent shall be 100 percent of the width given in Table 373-6(a). ~d insert 33 (percent fill) for both lead covered and Where the size of the supplier's service conductors is not non-lead covered conductors. readily available, the conductor size may be calculated as the SUBSTANTIATION: There exists a l~ttle understood problem of equivalent size of the largest aluminum conductors with a 75°C "jam ratio" where only three conductors are installed in a ampacity rating equal to the sum of the service overcurrent conduit. This is ratio of the diameters of the conduit and the devices tapped to the supplier's service conductors. In the single conductor (D/d). This ratio is critical between 2.5 and table, "Wires per terminal" is to be used to indicate the number 3.0 where the conductors are not triplexed. At a ratio of 3.0 of the supply service conductors in parallel per phase. and greater, the conduit is wider than the sum of the 3' SUBSTANTIATION The required width of the auxiliary gutters used conductors which prevents Jamming. on surv~ces for taps to several or more meter or service At this ratio the area of the conductors is 3d2~ equip(nent cabinets is inadequate dn many instances. No stated minmum depth is required. Due to the stiffness and size of the service conductors and to the large size of taped connectors, the connections are under pressure from adjacent conductors, The area of the conduit is (3d)2 = 9d2~ connectors, and the gutter cover. Even the best tapes are subject to abrasion due to expansion L ~ ---I-- and contraction of the conductors with the load cycle. They Fill = 3/9 = 33 1/3 percent. also soften due to heat. Shorts occur when the tape is abraded At 40 percent fill the maximum allowable conductors are always away or softened abnormally. More space will help connections in the critical Jam ratio. to be positioned away from each other and from the cover. The PANEL REC~NDATION: Reject. proposed size is minimum. Experience may indicate that larger PANtL ~UMM~NI: UMP ~ would prefer to withdraw the Proposal and sizes may be needed. It is rejected on that basis. More space is also needed as/additional taps are made to the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.. service conductors. This is ~specially true of commercial buildings with movable walls where the number, size, and loads of the occupancies is ever changing. Space is also needed when loads are checked with cllp-on ammeters, etc. Chapter 9, Table l, Note 6: Reject CMP 8 Increasing the size of service gutters is already often done SUBMITTER: CMP 8 by some electricians Who realize that the savings in PROPOSAL: I75C Add a new Note 6 as follows: installation labor and maintenance easily offset the additional ~ill shall be permitted for triplexed conductors." material cost involved. SUBSTANTIATION: Clarification. Safety is involved anytime a filled gutter is opened for PANEL RECOMMENDATION: Reject. inspection or to make changes as removing the cover allows the PANEL COMMENT: See Panel Comment on Proposal No. 175B. spring action of the cramped VOTE ON PANEL RECOI¢MENDATION: Unanimously Affirmative. conductors to come into play. Closing the cover puts additional pressure on the connections. PANEL RECOI~4ENDATION: Reject. PANEL COMMENT: Already covered by Section 374-9(d). Training Table 1, Chapter 9: Reject CMP 8 space is being studied by Panel 9. SUBMITTER: Joseph M. Ostrlhonsky, Sioux City, IA VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: ,176 I suggest that the number of wires that is a-lT6~--d-in 1/2 inch and 3/4 inch pipe be reduced to half. The wire I'm talking about is TW, THHN, THWN, sizes #12, #14, and #10. As an alternate, they would change the 40 percent fill to CHAPTER 9 -- TABLES AND EXAMPLES 60 percent fill based on individual diameters. SUBSTANTIATION: If you have had any experience at all, you will Chapter 9, A. Tables, Note 2: Reject CMP 8 know that is It very difflcult to pull, say 9-12 inch TW wires SUBMITTER: Peter Pollak, The Aluminum Association into a piece of 1/2 inch conduit. It is almost impossible if I~OFOSAL-~. 174 In the second sentence of Note 2, replace you havetwo go° bends in the conduit. This Js why I think they ~-~ted or bare)" with "(insulated, bare or compact)." should reduce the number of wires or else change the percent SUBSTANTIATION: Question arises in the field regarding the fill of the conduit. selection of the proper conduit size for the application. PANEL RECOMMENDATION: Reject. Makes clearer the fact that the actual dimensions of compact PANEL CL)f~ENI: ine "conduit fill tables are based on the concept equipment grounding conductor shall be used in the calculation that a safe practical.conduit fill percentage is one in which of conduit fill. the diameter of a circle circumscribed around the assembled PANEL RECOI~4ENDATION: Reject. conductors would approximate 75 percent of the conduit PANEL COMMENT: Proposal is pcimarily a design consideration. diameter. The net area of the conductors within this VOTE ON PANEL RECOMMENDATION: theoretical circle approximates 40 percent fill. AFFIRMATIVE: 14. The Code establishes a 40 percent maximum conduit fill. The NEGATIVE: Durham. Code also establishes a maximum of four quarter bends (360 EXPLANATION OF VOTE: degrees total). The Code does not establish a maximum length of DURflAM: Panel action is not consistent with Proposal No. 175. pull. The allowable length of a pull is contingent on a number of factors including but not limited to: I) maximum allowable conductor tension, 2) the plane of the bends (whether they are horizontal or vertical and whether any are reverse bends), 3) Chapter 9., A. Tables, Note 4: Accept CMP 8 proper cabling of the conductors, 4) the weight of the cable, 5) SUBMITTER: Peter Po'llak, The Aluminum Association the coefflcent of friction between the conductors and the I PRUPU~AL 175 In Note 4 insert "such as compact or conduit, and 6) sidewall pressure. i = ~ductor cables," after "Chapter 9.' Since the Code is not a design manual Judgement must be used ' SUBSTANTIATION: Question arises in the field regarding the in studying all of these "factors on whether.to use the maximum selection of the proper conduit size for the application. fill and the maximum number of bends to accommodate the maximum Makes clear the fact that actual dimensions of compact or length of pull. Proper cabling of a large number of conductors multlconductor cables shall be used in the calculation of is of extreme importance in such a Judge~nt. condu'i t fill. VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

158 363-18: Accept CMP 7 additions, deletions and moves. Even with raised floors two or SUBMITTER: TSC-Approved for the Purpose more feet above structural (true) floors It is difficult to get 126 See the Technical Subcommittee "Recommendations" enough pipe' In an installation to satisfy such needs. Use of un--fi-dE~--t'F~e definition of "Approved for the Purpose" in Article multiple runs of unpunched metal wlreway with hinged metal I00. covers and side mounted* metal outlet boxes has proved the most SUBSTANTIATION: See the TSC "findings" under the definition of practical way of handling large numbers of branch circuit "Approved for the Purpose" in Article 100. conductors in the relatively confined space under raised floors PANEL RECOYAMENDATION: Accept as Revised: in facilities ndt presently subject to the National Electrical I Delete "approved for the purpose" and replace with "identified Code. Supporting raceway off the floor minimizes problems for the use." related to dirt accumulation and accidental water spills. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Inclusion of intermediate metal conduit was made to cover this newly listed material while metal clad cable appears as useful as other metallic cable types. ~ *Note: Side mounting of boxes allows horizontal mounting of 363-20: Accept CMP 7 receptacles which eliminates dirt collecting in up-facing SUBMITTER: TSC-Approved for the Purpose receptacles. I~ITOI~O~'AL-~.• 127 See the Technical Subcommittee "Recon~mendations" PANEL RECOMMENDATION: Accept as Revised: un--n'd-6~-tT~ definition of "Approved for the Purpose" in Article Delete "copper-sheathed cable," "aluminum-sheathed cable," the 100. last sentence, and the exception. SUBSTANTIATION: See the TSC "findings" under the definition of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. "Approved for the Purpose" in Article 100. - \ PANEL RECOMMENDATION: Accept as Revised:

133 REPORT OF CODE-MAKING PANEL NO. 9 paragraph as presently written covers only nonmetallic boxes less than 100 cubic inches. The second paragraph as presently written covers nonmetallic boxes over 100 cubic inches manufactured with bonding means, i ARTICLE 370 -- OUTLET, SWITCH AND JUNCTION The proposed wording should add clarity to this section. The BOXES, AND FITTINGS word UException" is needed in the second paragraph because "only" is contained in the first, paragraph. 370-3: Reject ~ CMP 9 PANEL RECOMMENDATION: Reject. SUBMITTER: R. W. Eckardt, Underwriters Laboratories Inc. PANEL COMMENT: CI~° agrees with the intent of the Proposal see I Reviseas follows: action on Proposal No. 3. ~Nonmetallic Boxes. Nonmetallic boxes shall be permitted VOTE ON PANEL RECOI~IENDATION: Unanimously Affirmative; only with open wiring on insulators, concealedknob and tube wiring, nonmetallic-sheathed cable and with rigid nonmetallic f conduit. Exception: Nonmetallic boxes over lO0 cubic inches 370-4: Reject CMP 9 manufactured with bonding means between all raceway and cable SUBMITTER: Allen KnicKrehm, Los Angeles Chapter, NECA entries shall be permitted to be used with metal raceways and ]~)'I)O-S~L-~.'5 A means shall be provided in each metallic box, metal-sheathed cable. ~it is a pressed steel or a cast material type, for the SUBSTANTIATION: The wording adopted for the Ig78 Code connection of an equipment grounding Conductor. inadvertently emitted covering nonmetallic boxes over I00 cu. SUBSTANTIATION: Nonmetallic raceway and nonmetallic cable in. with rigid nonmetallic conduit. This error can be corrected systems using equipment grounding conductors require the by omitting the phrase "not over lO0 cu. in." in the first connection of such conductors to metallic boxes. sentence and making the second sentence an "Exception." The connections of grounding conductors where a means is not PANEL RECOMMENDATION: Reject. provided for the connections usually results in a hole and a PANEL COMMENT: See Panel action on Proposal No. 3. nut-and-bolt situation which may void the listing of the box, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. destroy its concrete or llquidtight integrity. Therefore it is felt that a grounding lug connection should be provided for the equipment grounding conductors. PANEL RECOMMENDATION: Reject. 370-3: Reject CMP 9 PANEL COMMENT: See Panel action on Proposal No. 5A. SUBMITTER: R. C. Medley, Square D Co. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: 2 In the first paragraph, delete the words "not over I-O-O cubic inches." In the second paragraph, delete the words "over 100 cubic inches." 370-20(d): Accept CMP 9 SUBSTANTIATION: The volumetric limitations impose unnecessary SUBMITTER: CI~° g restrictions to the usage and applications of nonmetallic ]}]TOIsO-~-A-C-~." 5A Add a new section 370-20(d) as follows: boxes. The first paragraph describes normal usage. It is ~s shall be provided in each metallic box, designed for irrelevant to state volumetric limits. The second paragraph use with nonmetallic raceways and nonmetallic cable systems, for permits usage with metallic connections provided suitable the connection of an equipment grounding conductor. bonding is included. Again, volumetric restriction is not SUBSTANTIATION: We agree with the intent of Propdsal No. 5, but significant to usage. think this wording is better. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept as Revised: PANEL COMMENT: Nonmetallic boxes less than 100 cu. inches are Add title to section "(d) Grounding Provisions. N not suitable for use with all wiring methods. Change "metallic" to "metal" box to remain consistent with VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. remaining portions of Section 370-20. COMMENT ON VOTE: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. CRAMER: In our Panel discussions, pushbutton devices in nonmetallic boxes (pushbutton stations) smaller than 100 cubic inches wece discussed. Pushbutton ~tations are not covered under Article 370 and consequently this Section does not 370-5: Accept . CMP 9 preclude the use of such a nonmetallic station with metal SUBMITTER: TSC-Approved for the Purpose raceways. I~TOI~)-S'AL-~. 6 See the Technical Subcommittee "Recommendations" ~the definition of "Approved for the Purpose" in Article 100. SUBSTANTIATIONI See the TSC "findings" under the definition of 370-3: Accept CMP 9 "Approved for the Purpose" in Article 100. SUBMII-TER: J.J. Kark, National Electrical Manufacturers PANEL RECOIIMENDATION: Accept as Revised: Delete the words "shall be approved for the purpose" and add PROPOSAL: 3 Deletethe words "not over 100 cubic inches" from the words "shall be listed for use in wet locations." ~t paragraph of 370-3. Add the word "also" after "shall" VOTE ON PANEL RECOI~MENDATION: in the second sentence. AFFIRMATIVE: 11. The recommended text would read: NEGATIVE: Cramer. 370-3. Nonmetallic Boxes. Nonmetallic boxes shall be permitted EXPLANATION OF VOTE: only with open wiring on insulators, concealed knob-and-tube CRAMER: "Listed" boxes in the size desired are not always wiring, nonmetallic-sheathed cable, and with rigid nonmetallic available. Field fabrication or modification is sometimes conduit. required. Consequently the box cannot be listed. Remove Nonmetallic boxes over 100 cubic inches manufactured with "approved for the purpose" and replace with "suitable for the bonding means between all raceways and cable entries shall also environment." be permitted to be used with metal raceways and metal-sheathed cable. SUBSTANTIATION: Needed for clarification. The wording "not over 100 cubic inch volume" is unnecessarily restrictive. 370-6(a) & Table 370-6(a): Reject CMP 9 The word "also" would clarify this as an additional permitted SUBMITTER: Paul DeMuth, Sheldon, IA use. I~IOFO3XZT 7 PANEL RECOMMENDATION: Accept as Revised: ~'~o--be added to Table 370-6(a) between line 18 and line 19: Add the words "In addition thereto" before the word 4 I/8 x 2 3/8 x 2 1/8 Device 18.0 g 8 7 6 0 "Nonmetallic" in the second sentence. t. VOTE ON PANEL RECOMMENDATION: B. To be added after Section 370-6(a) with the current Section AFFIRMATIVE: 11. 370-6(a)(2) to follow as 370-6(a) 3: NEGATIVE: Barker. (2) Where used, with oversized devices (dimmers, EXPLANATION OF VOTE: photo-cells, etcL) freespace in addition to BARKER: All nonmetallic boxes over 100 cubic inches should that required in Section 370-6(a)(1) shall be have bonding means to prevent misapplication in the field with adequately provided for. metal conduit. The alternate would be to prohibit the use of SUBSTANTIATION: metal conduit. Grounding is an essential safety requirement. A. The 4 1/8 x 2 3/8 x 2 1/8 de~ice box is often needed for surface work requiring 3/4 inch and larger conduit for Junction and outlet boxes. As such it should be added to the listing of metallic boxes in B. When applying standard box fill methods to 370~3: Reject CMP 9 the use of some larger devices, it has been found that planned SUBMITTER: Donald W. Cremer, St. Louis, MO boxes are often too small to properly provide required free 4 In the first paragraph, eliminate "not over 100 space. By the addition of a new section to point out potential ~ches." problems in this critical area, errors in freespace planning In the second paragraph, add "Exception" prior to the first may be avoided. word of the paragraph. PANEL RECOMMENDATION: Reject. , SUBSTANTIATION: Wording is intended to clarify only. Present k wording does not cover nonmetallic boxes over I00 cubic inches that are not manufactured with bonding means. The first

160 PANEL COMMENT: (a) The table does not preclude the use of this 370-6(c), Exception-(New): Reject CMP 9 box. While we recognize this is a commonly used box, it is not SUBMITTER: Roger C. Troupe, Fremont, NB necessary to include it in Table 370-6(a) as a standard box. (b) FR'OIB~)-S-A-L-~. 12 Amendby adding exception to read: It is unenforceable. ---E'R'E'epCion: Conduit bodies having two entries shall be VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. permitted to have wire to wire splices, for the connection of utilization equipment leads (Including switching devices) where thls equipment does not have connection space provided in it or Table 370-6(a): Reject CMP g for the connections required to change from a conduit wiring SUBMITTER: Norman B. Cooney, Parma, Ohio method to a single cord method as allowed by Article 400, where 8 Delete3 x 2 x 1 I/2 device box. the fill will not exceed 75 percent at any cross-sectlon. ~IATION: All of these boxes contain cable clamps and SUBSTANTIATION: NFPA No. 70-PR78'contained nine proposed flush devices. Deducting two conductors or even one conductor revisions in regard to Section 370-6(c), the one being accepted makes it impossible to use this slze box for wiring wlth 12/2 or that of CI~° g. Although some clarification was made, one of the 14/2 N.M. cable w/grnd. main objectives sought In the other eight proposals (the PANEL RECOMMENDATION: Reject. allowability of splicing cords and leads of utilization PANEL COMMENT: Supporting comment is notpersuasive as to equipment where connection boxes are not provided in conduit necessity. The Panel does not agree with the supporting comment. bodies with two entries) was still not achieved. If it can be VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. interpreted that splicing conductors in conduit bodies with only two entries is allowable under the provisions of section (b), (even though section (b) opens with its reference being to boxes 100 cu. in. or less, conduit bodies having provision for more 370-6(a)(1): Accept CMP 9 than two conduit entries, and nonmetallic boxes) when section SUBMITTER: William E. Slater, RACO Inc. (b) is refer~ed to by section (c), then the necessary PROPOSAL: 9 Reviselast sentence and add new sentence as ~llowability for splices and taps in all conduit bodies has been provided for. However, it is 'still virtually impossible to use The volume of a wiring enclosure (box) shall be the total standard conduit bodies sized the same as the conduit, where the volume of the assembled sections, and where used, the space conduit is sized properly in accordance with the conductor size provided by plaster rings, domed covers, etc., that are marked and still fit within the scope of Section 370-6(b). with th'eir volume in cubic inches, and extension rings. The Where cords or the attachment leads of utilization equipment volume of extension rings shall be considered equal to the (including switching devices) are spliced in a conduit body, the volumes shown in Table 370-6(a), for its cemparable box danger of damage to the conductors due to lesser space than dimensions, unless marked with a greater volume. required in Section 370-6(b) is minimized 6ecause of the greater SUBSTANTIATION: Extension rings are basic boxes with the major degree of flexibility of the cord or equipment leads due t 9 portion of the bottom removed and some means provided for either their being stranded, or being smaller in size, or both. attachment to a box. The basic boxes, that are .listed in Table (Note: Table 370-6(b) does not specify conductors smaller than 370-6(a) are-generally used in manufacturing extension rings, No. 14.) but volume is not significantly increased by merely renw)ving the Because these connections can be facilitated safely if bottom of a box, therefore, additional conductor space is not cross-section fill is limited to 75 percent, and because space provided. about equipment is not always adequate to install a box or PANEL RECOMMENDATION: Accept as Revised: conduit body of adequate size as required by Section 370-6(b), I Revise paragraph 370-6(a)(I) of the 1978 NEC as follows: add there is a very definite need for the provisions of this the words to the last sentence "inches, or are made from boxes exception. the dimensions of which are listed in Table 370-6(a)." PANEL RECOMMENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: Panel feels subject is adequately covered. The present wording, adequately reflects the Panel's intent. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: 370-6(a)(1): Accept CMP 9 CRAMER: I disagree with the need for an exception for a two SUBMITTER: Kirk Jervik, Sheldon, IA entry conduit body but feel that the requirements for two or 10 Revise the second sentence as follows: mere entry conduit bodies need clarity. Where one or more of each of the following fixture studs, Splicing is now allowable in two entry conduit bodies but cable clamps, or hickeys are contained In the box, the number of sizing requirements imposed by Section 370-6(b) are difficult to conductors shall be one less than shown on the tables. follow. I don't feel the subject is clearly covered. We should' SUBSTANTIATION: The problem lies in that there seems to be some relocate to Section 370-6(c) all requirements pertaining to confusion, to myself and others I've been associated with, as to conduit bodies and therein locate requirements pertaining to whether the intent and purpose of the article is to make one splices, taps and wires passing through the conduit body. deduction and only one, whether the box contains Just cable clamps; Just fixture studs; Just hickeys, or all three. I firmly believe that with my proposal it will clarify the fact that a deduction will be made when the box contains one of the 370-7(c): Reject Cl~D 9 above mentioned, a box containing two of the above mentioned SUBMITTER: Dale R. Deming, RACO, Inc. will have two dedbctions, and a box with all three deductions. 13 Revise as follows: For example, a box containing two cable clamps and a fixture ~onmetallic Boxes. Where nonmetallic boxes are used with "stud will have two deductions. One will be made for the cable open wiring or concealed knob-and-tube wiring, the conductors clan~)s and one for the fixture stud. shall enter the box through individual holes. Where flexible PANEL RECOMMENDATION: Accept as Revised: tubing is used to encase these conductors, the tubing shall Revise second sentence as follows: Where one or mere of these extend from the last insulating support to no less than 1/4-inch types of devices, such as fixture studs, cable clamps, or inside the box. hickeys are contained in the box, the number of conductors shown (2) Where nonmetallic sheathed cable is used with boxes which in the table shall be reduced by one for each type of device; an accept only one strap, containing one or more devices, and with additional deduction of one conductor shall be made for each boxes mounted in ceilings that do not contain devices and where strap containing one or mere devices; and a further deduction of the cable is fastened within eight inches of these boxes~ one conductor shall be made for one or mere grounding conductors measured along the sheath, and the sheath extends into the box entering the box. no less than 1/4-inch, securing the cable assc~nbly to the box VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. shall not be required. In all other instances, the cable assembly shall be secured to nonmetallic boxes. SUBSTANTIATION: Considerable confusion has resulted from the 370-6(a)(1): Reject CMP 9 terminology used in the present Code. Reference to single gang SUBMITTER: Norman B. Cooney, Parma, Ohio boxes does not indicate which specific types of boxes shall 11 In second sentence after "for", delete "one or require some means of securing the cable to the box. Also, in more grounding conductors" and substitute "any." combining the requirements for nonmetallic sheathed cable with SUBSTANTIATION: It is a physical impossibility to install 2 open wiring and concealed knob-and-tube wiring methods, present switches on a 2-gang N.M. box that is 45 cu. in. and contains wording indicates that individual conductors and cables shall be 3-12/3 and 4-12/2 N.M. cables. Those 6 grounding conductors secured when using nonmetallic sheathed cBble. This was not the that are not counted still reduce the cubic inch capacity of the intent of C~ No. 9 in accepting the proposal. The reference to box and when the combinations are 1-12/3 and 7-12/2, the individual conductors is to apply only to open wiring and conductors stick out of the box 1/2 inch. Now instead of 6 concealed knob-and-tube wiring. grounding conductors we have 7. This proposal, while not changing intent, clearly defines These cables must come into the box from the top and bottem those applications in which securing the cable to t~e box is and all the knock-outs are used so the grounding conductors must required and it more properly states the cable assembly, thus traverse diagonally as well as horizontally and vertically. eliminating the confusion of individual conductors within a The end result is not only unsafe, but it is impossible to cable assembly. terminate flush devices in the box. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 13A. Present PANEL COMMENT: The present wording adequately reflects the requirement is necessary. Panel's intent. If a larger box is needed the Code permits its VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. use. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

161 370-7(c): Accept CMP 9 VOTE ON PANEL RECOMMENDATION: SUBMITTER:. C/iP 9 AFFIRMATIVE: 11. PROPOSAL: 13A Delete the last sentence and add the NEGATIVE: Leiman. t'oTFow-i~ng: "In all other instances, (1) cables and (2) EXPLANATION OF VOTE: individual conductors of open wiring and concealed knob and tube LEIMAN: . I agree with the supporting comment. In my personal wiring, including the flexible tubing if used, shall be secured experience and discussions with other inspectors, I have found to nonmetallic boxes. Metal raceways, nonmetallic conduit, or that the cable sheath has been pulled out of single gang boxes. metal-sheathed cable shall be secured to nonmetallic boxes. SUBSTANTIATION: Clarification for first sentence. Second sentence was inadvertently left out of the 1978 NEC. PANEL RECOMMENDATION: Accept as Revised: 370-7(c): Reject CMP 9 Revise last sentence of 370-7(c) to read: "In all other SUBMITTER: Rudolph V. Jones, Virginia Chapter,. IAEI instances all permitted wiring methods shall be secured to the PI~O]~O-{JJ~-~.• 18 Delete the words "with single gang boxes" in the boxes." ~6u-r-t-h--sentence. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: The requirement for the securing of nonmetallic-sheathed cables to other than single gang boxes is not warranted and results in an unnecessary additional expense. If it can be considered safe that nonmetallic-sheathed cable 370-7(c): Reject CMP 9 need not be secured to single gang boxes when fastened within 8 SUBMITTER: R. C. Medley, Square D Co. inches of the box measured along the sheath, the application of 14 In the fourth sentence, delete the words "is used such to multi-gang boxes should also be just as safe. The last ~gle gang boxes and where the cable." sentence specifically requires that cables be secured to the SUBSTANTIATION: The paragraph limits usage.to single gang boxes multi-gang box where the cables are not fastened within 8 inches for which there is no.definition. Entry of multiplecables may of the box measured along the sheath. Unnecessary cl~mps result be accomplished by securing cables within eight inches in a decrease in volume and work space in the box and increase independent of box style description. the possibility of damage to the cables. PANEL RECO/~iENDATION: Reject. PANEL RECOI~MENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 13A. Present PANEL COMMENT: Present require~lent is necessary. See Proposal requirement is necessary. No. 13A. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

370-7(c)~ Reject CMP 9 370-10 and 380-9: Reject CMP 9 SUBMITTER: J.a. Kark, National Electrical Manufacturers SUBMITTER: Norman B. Cooney, Parma, Ohio ~on 19 After last word in paragraph "therefrom" insert PROPOSAL: 15 Revise fourth sentence to read: "but no more than 1/8 inch." ~-er-e nonmetallic-sheathed cable is used with boxes which SUBSTANTIATION:' Since no dimensions are given for the accept only one strap containing one or more devices and wlth projection of the box, it could conceivably be out one (1) inch boxes mounted in ceilings which ,are for the support of a or more. By limiting the projection to I/8 inch you would be fixture, and where the cable is fastened within 8 inches of the able to comply wlth 380-9 (faceplates to seat against the wall box measured along the sheath and the sheath extends into the surface). box no less than i/4 inch, securing the cable to the box shall PANEL RECOMMENDATION: Reject. not be required. PANEL COMMENT: Panel feels subject is adequately covered. No • SUBSTANTIATION: This sentence as written in the 1978 NEC has significant contribution to safety would result. created considerable confusion. The sentence Is being rewritten VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. to clarify its original intent. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 13A. Present. requlroment is necessary. 370-I0, E~ception-(New): Reject CMP 9 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: Ted Steppe, STEPP-ELEX Corp. ]~-OIR~{~]~-~.'\20 Add a new exception as follows: . l~-x-Eeption: The front edge of box need not be flush with wall surface If an approved cover plate having a recessed center 370-7(c): Reject CMP 9 section which effectively seals the box front and the adjoining SUBMITTER: H.F. van der Voort, Cleveland, OH wall surface Is used. ]~-O'P-O~FA-CT.. 16 Change sentences 4 and 5 to read: Clamping of' SUBSTANTIATION: The problem: The extra thickness of paneling "i~'-dTv-J'dual conductors or cables to the box shall not be required when added to a wall means the electrical outlets and switches where supported within 8 inches of the box. Where rigid must be moved out to make them flush with the new wall surface. nonmetallic conduit is installed with nonmetallic boxes or This is a project in itself and can be very costly and time fittings, the conduit shall be secured to such boxes and " consuming. The alternative is to shlm out the electrical device fittings in an approved manner. which could create a potential fire hazard for lack of proper SUBSTANTIATION: The present Code wording lacks clarity. In sealing of the electric box. Most home owners use the alternate addition, it has not been demonstrated by field failures that method. nonmetallic boxes when installed as described above constitute a The answer: The STEPP-PLATE has a recessed center area of hazard, and until the 1978 Code revision, this was the accepted sufficient slze to effectively seal the electrical box as well procedure. In fact, even when clamps are provided for they are as any approved cover. The advantage we have over other covers often not used. When recemmended changes increase costs, their Is that STEppoPLATE also has the thickness of a new wall need should be clearly demonstrated. covering built into It. This insures a tight fit to both the PANEL RECOMMENDATION: Reject. electric box and the wall surface. PANEL COM~iENT: Present requirement is necessary as it applies PANEL RECOMMENDATION: Reject. to the fourth sentence. See Committee action on Proposal No. PANEL COMMENT: Present requirenent is necessary. If the 13A for the intent of the f~fth sentence. faceplate is changed later to a standard type, the installation VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. will be In violation of the Code. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 10. NEGATIVE: Eckardt, Cramer. 370-7(c): Reject CMP 9 COMMENT ON VOTE: SUBMITTER: Idaho Chapter IAEI DEMING: I would vote to accept this proposal if it were I~'OP-O-S~--~.• 17 Delete last two sentences. reworded to limit the exception to apply only where paneling or end of the third sentence of 370-7(c), change the some similar finished surface, not over 1/4 Inch thick is "period" to a "comma" and add "individual conductors and cables applied over an existing wall. shall be secured to such boxes" to read: EXPLANATION OF VOTE: Where nonmetallic-sheathed cable is used¢ the cable assembly, ECKARDT: I can agree with the submltter and also wlth his including the sheath, shall extend into theXbox no less than 1/4 substantiation under Proposal No. 22 if the use of the device is inch through a nonmetalllc-sheathed cable knockout opening, limited to rework. I suggest the proposal be prefixed "For individual conductors and cables shall be secured to such boxes. remodeling work the front edge etc." SUBSTANTIATION: There is no assurance that the sheath of CRAMER: The proposal has merit. The reason for rejection is nonmetallic sheathed cable wlll remain in the nonmetallic box if the faceplate is changed later to a standard t~qoe, a when the device Is inserted into the box even though the cable violation would occur. If this change were made, outlets and is strapped within 8 inches as required. It is Just as switches would then have to be moved out to make them flush. important that the cable sheath remains in a single gang box as There's no difference in the work. It's Just that In the latter any other type of box. case, If the proposed faceplate were never changed, that work PANEL RECOM&iENDATION: Reject. would never be required. PANEL COMMENT: The present wording adequately reflects the Panel's intent. There Is no evidence the present Code is inadequate.

162 370-11: Accept CMP g "Approved for the Purpose" in Article 100. SUBMITTER: Norman B. Cooney, Parma, Ohio PANEL RECOMMENDATION: Accept as Revised: 21 After "Repairing Piaster" add "and drywall or Revise the second paragraph of 370-13 to read as follows: ~oard." After'"Plaster" (first word in sentence) add "Boxes installed in walls of previously occupied buildings or In "drywall or plasterboard." walls In which there are no structural menfoers shall be SUBSTANTIATION: Plasterboard or Drywall is used in 95 percent supported by the use of devices, clan~s or anchors which will of today's construction end the oversight in not having included provide the secure and rigid installation required by this It in previous Code changes eludes me. ISection of the Code." This paragraph, llke so many others ,in the Code, mentions a VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific covering "plaster" and does not address itself to other forms of wall and/or ceiling coverings. The end result is an untenable position for the enforcing authority explaining why this also applies to other forms of 370-13: Reject CMP 9 plaster-content wall coverings when the Code mentions no other SUBMITTER: Dean Woelber, Hull, IA forms. When appeals by contractors are refused by City Building PROPO--S-A-C~." 25 Proposedwording of new paragraph to be added at Board of Appeals, they then file in Con~on Pleas Court and the t--F;-e-en-d'-of 370-13 is as follows: "Threaded boxes or fittings Judge is usually not concerned wlth the intent of the CMP, but not over 100 cubic inches in size shall be considered to be the explicit wording of the article or paragraph in dispute. adequately supported if at least one conduit is threaded into Since drywall construction has been used extensively since the the box wrenchtight, and is securely fastened to the surface on end of World War II by builders, I believe it is time to use which it is carried as required by Articles 345-12, 136-12, and contemporary wording in the Code to alleviate the problems by this article. The box shall have no other means of support caused by outmoded building standards. readily available. The conduit shall be supported at least PANEL RECOMMENDATION: Accept. twice, one of these supports being no further than 18 inches VOTE ON PANEL RECO~ENDATION: " from the box." AFFIRMATIVE: g. SUBSTANTIATION: Many times it can be in,possible to securely NEGATIVE: Barker, Biermann, Cock. fasten a box exactly where it is needed or wanted, because the EXPLANATION OF VOTE: surface to which it should be mounted is either an irregular BARKER: This is a necessary requirement to protect wood shape, a material such as glass, or some type of brittle constructed walls from arcs, sparks and molten metal coming in plastic. In these situations, it could be Just as good if not contact with combustible walls and framing. It is just as better to support the box by the conduit threaded into the box. enforceable as any other safety requirement. Any loss from this The conduit must be.supported at least twice, one with 18 inches would surely be called an electrical fire. of the box which will give the box a rigid support, and the BIERMANN: Thls is a building code rule. Electricians cannot second support would keep it from twisting. be responsible for the installation practices of other tradesmen. PANEL RECOMMENDATION: Reject. COCK: I believe that Section 370-11 should be deleted from P/~I~EL COMMENT: Present requirement is necessary. The Panel the Code or changed because the present wording is entirely too does not agree with the supporting comment. restrictive and compliance is impossible in most cases. It VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. should be changed to require that gaps o~ open spaces be held to the minimum for practical working conditions. I agree that Section 370-11 should be changed to apply to all materials if this Section remains in the Code. However, I would like to see 370-14: Reject CMP g the Section reworded to reflect reality. SUBMITTER: Norman B. Cooney, Parma, Ohio 26 After "not less than" in second sentence, delete "15/16 inches" and add "that specified in Table 370-6(a) and 370-6(b)". 370-11, Exception-(New): Reject CMP 9 SUBSTANTIATION: All devices measure7/8 inch to 1 1/8 inches. SUBMITTER: Ted Steppe, STEPP-ELEX Corp. Obviously any device measuring 15/16 inches and more cannot be PROPOSAL: 22 Add a new exception as follows: used in this box so I will address myself to those measuring 7/8 -~-~ception: Wall Surface need not contact the edge of th e inch. Not wishing to fractionalize, I will use whole numbers. electrical box if an approvedcover plate having a recessed The box is. 6 cu. in. and using 14-2 w/grnd., the conductors center section which effectively seals the box front and the equal 6 cu. in. which simply means you could not use a flush adjoining wall surface is used for the purpose of recessing a device in this box. With a device and cable clan~o in the box device into the wall. you could not comply with Table 370-6(a) and (b). I have not SUBSTANTIATION: The box could be set flush with the stud in new mentioned EMT because the l~cknut measures 1 I/8 inches and is construction. Then the receptacle or switch would be recessed physically impossible to install in this box. Mathematically the thickness of the finished wall. This would prevent the speaking, thls box cannot be used for flush devices. switch or cord cap and receptacle from being damaged when heavy PANEL RECOMMENDATION: Reject. objects are pushed against the wail. This would also protect P~NEL COMMENT: Supporting comment is not persuasive as to the cord caps and switches in high traffic areas frombeing hit necessity. and damaged. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 20. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: 370-17(b): Accept CMP 9 ECKARDT: This change is not needed regardless of the outcome SUBMITTER: TSC-Approved for the Purpose of Proposal No. 20. PITOPO-S~Z-~. 27 See the Technical Subcommittee "Recommendations" DEMING: Allowing receptacles to be recessed the thickness of ~e definition of "Approved for the Purpose" in Article the finished wall will lead to the practice of Jerking or 100. pulling directly on the cord to remove the plug from the SUBSTANTIATION: See the TSC "findings" under the definition of receptacle. "Approved for the purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: Revise paragraph 370-17(b) to read: "Boxes listed specifically for this application shall be used for receptacles 370-13: Accept CMP g located in the floor. SUBMITTER: J.J. Kark, National Electrical Manufacturers Exception: Boxes located in elevated floors, of show windows ~on and similar locations where the (authority having Jurisdiction PROPOSAL: 23 In first paragraph, revise second sentence to judges them to be free from physical damage, moisture, and dirt." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Where nails are used as a mounting means and pass through the interior of the box, they shall be located so that they do not interfere with the installation of the device and are within 1/4 inch of the back or ends of the box. 370-18(c): Accept CMP 9 SUBSTANTIATION: For boxes such as 3-1/2 inch deep switch boxes SUBMITTER: TSC-Approved.for the Purpose or boxes with in turned device mounting ears, through nails PROPOSAL: 28 See the Technical Subcommittee "Recommendations" located within 1/4 inch of the ends of the box can give less ~e definition of "Approved for the Purpose" in Article interference and better structural support than nails within I/4 100. inch of the back of the box. SUBSTANTIATION: See the TSC "findings" under the definition of PANEL RECOMMENDATION: Accept. "Approved for the Purpose" in Article 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised: I Delete"approved for the purpose" and insert "compatible with the box or fitting construction and suitable for the conditions of use." \ 370-13: Accept CMP 9 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC.Approved for the Purpose PITOI~CI--T.• 24 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. SUBSTANTIATION: See the TSC "findings" under the definition of

163 370-19: Reject CMP 9 370-20(b): Reject CMP 9 SUBMITTER: R. S. Pinkerton, Los Angeles, CA SUBMITTER: Harry Silver, Silvine, Inc. 29 Add a paragraph, revise Exception No. 1, and add PROPOSAL: 32 Revise as follows: new Exception Nos. I and 2. ~-~ Thickness of Metal. Sheet steel boxes or die cast A work space at least 24 inches horizontally and 24 inches in aluminum boxes and fittings not over 100 cubic inches in size height shall be provided in front of each junction, pull and shall be made from metal not less than .0625 inches thick. The outlet box. Access thereto shall be provided by a space not wall of a malleable iron box, permanent-mold cast aluminum box less than 24 inches in height and 20 inches in width. Crawl permanent-mold brass or bronze box shall not be less than holes, scuttles or similar openings to such space shallbe not 2/32-inch thick. Other cast metal boxes shall have a wail less than 18 inches by 18 inches in size. thickness of not less than 1/8-inch. Exception No. I: Boxes approved For the purpose shall be SUBSTANTIATION: The reason for the request for change is permitted where covered by a thin coating of plaster or covered because the integrity of the die cast aluminum box will easily by gravel-like aggregate or noncohesive granulated soil if their endure any of the impact, compression, and other mechanical location is effectively identified and accessible for strength tests that plastic boxes are now being subjected to for excavation; or similar uses and exceed requirements at the upper and lower Exception No. 2: Boxes that are listed for use as pull or temperature levels. Aluminum has the advantage of not needing a Junction boxes and are an integral part of a recessed fixture or protective finish to provide the life tests presently required approved appliances; or from steel boxes. The die cast box has the added advantage that Exception No. 3: Outlets supplying built-in appliances such we can design for added wall thickness at various points of as gas ovens and the like where there are ho conductors in the possible stress to assure the integrity of the boxes under the outlet box except the supply conductors terminating therein and necessary tests. At the areas of load such as the threaded the appliance is connected to the outlet in an approved manner. holes, the thickness can be increased to provide any mechanical SUBSTANTIATION: The present vague and general requirements for strength that may be required. accessibility to Junction and outlet boxes are unenforceable in The connectors may be designed into the box at time of new construction conditions as it is not possible to know the manufacture, eliminating possible build up of tolerance errors conditions of, access, especially in attic or undeP floor spaces, in assembly, and mistakes and misuse of parts. The thinner die until the construction is complete. To be enforceable a cast boxes will be of great advantage to the industry and public specific clear area as proposed in this requirement must be in general by reducing the energy costs needed to produce the stated. .The proposed requirement has been in effect for many product. It will be possible to save a good quantity of years in the City of Los Angeles and has proven to be effective, material by lowering the wall thickness. Benefits are four fold reasonable and enforceable. - saving of energy, material, ease of use, and reduction of PANEL RECOMMENDATION: Reject. freight costs to Job site. PANEL COMMENT: Panel feels subject is adequately covered. No Present variety of'die cast boxes with .093 inch wall evidence to support the suggested change. thickness have more than required mechanical strength. This VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. lighter product is more handy at the time of installation and at the same time has all benefits of boxes with thicker walls. PANEL RECOMMENDATION: Reject. PANEL COMMENT: We believe the present thickness is necessary. 370-19: Reject . CMP 9 Thickness is necessary to contain arcing faults. SUBMITTER: Southwestern Section IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. P--R-O'P-O-S~A-L-~ 30 Ad~ a second paragraph to present Section 370-19

A work space at least 18 inches horizontally and 18 inches in height shall be provided in. front of each Junction, pull and 370-20(b): Reject CMP g o~tlet box. Access thereto shall be provided by a space not SUBMITTER: R. C. Medley, Squire D Co. less than 18 inches in height and 20 inches in width. Crawl 33 Revise as fol]ows: holes, scuttles or similar openings to .such space shall be not ~-T Thickness of Metal. Sheet steel boxes and fittings not less than 18 inches by 18 inches in size. over 100 cubic inches in size shall be made of a sheet thickness Exception No. 1: Boxes approved for the purpose shall be not less than 0.0625 inches. The wails of a malleable iron box permitted where covered by gravel-like aggregate or non-cohesive and a die-cast or permanent-mold, case aluminum, zinc, brass or granulated soll if their location is effectively identified and bronze box shall not be less than 3/32-inch thick unless accessible for excavation; or suitably reinforced by ribs. Other cast metal boxes shall have Exception No. 2: B6xes that are listed for use as pull or a wall thickness not less than 1/8-inch unless/suitably junction boxes and are an integral part of a recessed fixture or reinforced by ribs. / approved appliances; or SUBSTANTIATION: Clarification of sheet steel thickness is Exception No. 3: Outlets supplying built-in appliances such necessary to identify the starting thickness of ~ drawn or bent as gas ovens and the like where there are no conductors in the steel box where the thickness is reduced slightly by the metal outlet box except the supply conductors terminating therein and forming operation with no significant loss of strength or the appliance is connected to the outlet in an approved manner. longevity. 'SUBSTANTIATION: The present vague and general requirements for The omission of die-cast zinc of comparable thickness has accessibility to junction and outlet boxes are unenforceable in restricted the use of an available material as corrosion new construction conditions as it is not possible to know the resistant as aluminum. conditions of access, especially in attic or under floor spaces, The reduction of minimum wall thickness for castings is now until the construction is complete. To be enforceable, a feasible by modern technology. It is no longer necessary or specific, clear area as proposed in this requirement must be economical torequire thickness where strehgth and rigidity is stated. The proposed requirement has been in effect for many achievable by suitable design. years in the City of Los Angeles and has proven to beeffective, PANEL RECOMMENDATION: Reject. reasonable~and enforceable. PANEL COMMENT: Present requirement is necessary. The Panel PANEL RECOMMENDATION: Reject. does not agree with the supporting comment. Thickness is needed PANEL COMMENT: Panel feels subject is adequately covered. No to contain arcing faults. evidence to support the suggested change. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL REC~ENDATION: Unanimously Affirmative.

370-21: Reject CMP 9 370-19; Exception: Accept (~ CMP 9 SUBMITTER: R. C, Medley, Square D Co. SUBMITTER: TSC-Approved for the Purpose ~34 Revise as follows: 31 See the Technical Subcommittee "Recommendations" ~Covers. Sheet steel covers shall be made of a sheet ~e definition of "Approved for the Purpose" in Article thicknessnot less than .0625 inches or be suitably reinforced 100. by ribs. Die-cast or permanent-mold cast metal covers shall be SUBSTANTIATION: See the TSC "findings" under the definition of not less than 3/32-inch unless suitably reinforced by ribs. "Approved for the Purpose" in Article 100. Other cast metal covers shall be not less than 1/B-inch unless PANEL RECOMMENDATION: Accept as Revised: suitably reinforced by ribs. Covers of porcelain or Other Delete the words "approved for the purpose''' and add the word insulating material shall be permitted if of such-form and "Listed" at the beginning of the exception. thickness as to afford the required protection and strength. VOTE ON PANEL RECOMMENDATION: SUBSTANTIATION: Editorial changes requested to clarify AFFIRMATIVE: 10. construction details. Present wording intended~to correlate . NEGATIVE: Cramer, Deming. with Sections 370-20 and 373-10 but is ambiguous and confusing. EXPLANATION OF VOTE: PANEL RECOMMENDATION: Reject. CRAMER: Listed boxes in the size desired are not always PANEL COMMENT: Present requirement is necessary. The Panel available. Field fabrication or modification is sometimes does not agree with the supporting comment. Thickness is needed required. Consequently, the box cannot be listed. Remove to contain arcing faults. "approved for the purpose" and replace with "suitable for the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. env irooment." DEMING: I am opposed to the word "listed." Listed as defined in Article 100 (definitions) woul~ prohibit the use of custom made boxes. In instances where a one-of-a-kind box is r~quired, "listing" is not practical. Designed is a more appropriate word.

164 ARTICLE 372 -- ENCLOSURE TYPES Table 372-4B Comparison of Specific Applications of Article 372-(New): Reject CMP g Enclosures for Outdoor Nonhazardous Locations SUBMITTER: Francis A. Marta, Circle A WProducts Co. 35 Add a new article as follows: Provides a Degree of Article 372 -- ENCLOSURE TYPES Protection Against the T~pe of Enclosure 372-1. Scope. This article covers the general requirements for Following Enyironmental various types of enclosures for electrical equipment rated 600 Conditions 3 3R 3S 4 4X 6 6P volts nominal or less, installed in nonhazardous locations. Incidental contact with Exception to Scope: The enclosures described herein are not the enclosed equipment X X X X X X X intended to: .protect the enclosed equipment against conditions Rain, snow and sleet* X X X X X X X such as condensation, icing, corrosion or contamination which Sleet** X occur within the'enclosure or enters via the conduit or unsealed Windblown dust X X , X X X X openings; cover enclosures for rotating apparatus; or cover Hosedown X X X X means to prevent attempted entry or operation by unauthorized Corrosive agents X personnel. This article does not cover requirements for wire Occasional temporary and cable. submersion X X Enclosures for use in hazardous locations shall conform to Occasional prolonged Articles 500 through 517. submersion X 372-2. Purpose of Enclosures. Enclosures are constructed to provide a degree of protection, when completely and properly installed, against incidental contact with the enclosed *External operating mechanisms are not required to be equipment and to provide a degree of protection to the enclosed operable when the enclosure is ice covered. equipn~nt agalnstspecified environmental conditions. **External operating mechanisms are operable when the 372-3. Enclosure Type Descriptions. Enclosures shall be enclosure is ice covered. identified with one or more types for the following environmental conditions: 372-6. Operating Mechanisms. Externally operated mechanisms (a) Type 1-1ntended for indoor use primarily to provide a such as circuit breakers or disconnect operating levers ahd degree of protection against contact with the enclosed equipment. other mechanisms including pushbuttons and pilot lights when (b) Type 2-1ntended for indoor use primarily to provide a installed through the enclosure wall shall provide the same degree of protection against limited amounts of falling water • degree of environmental protection as the enclosure. and dirt. SUBSTANTIATION: Type numbers have been associated with various (c) Type.3-1ntended for outdoor use primarily~to provide a enclosures for many years but with a somewhat lack of degree of protection against windblown dust, rain, sleet and standardization except for a few types, and these have not been external ice formation. too well publicized. (d) Type 3R-Intended for outdoor use primarily to provide Electrical contractors, electrical inspectors and users have degree of protection against falling rain, sleet and external felt a need for having a basis for selecting and accepting the ice formation. proper enclosures for the various applications with proper (e) Type 3S-Intended for outdoor use primarily to provide a markings to meet the requirements of Sections 110-3 and 110-11 degree of protection against windblown dust, rain and sleet, and of the National Electrical Code. to provide for operation of external mechanism when ice laden. PANEL RECOMMENDATION: Reject. (f) Type 4-1ntended for indoor or outdoor use primarily to PANEL COGENT: The C~ believes that extending the requirements provide a degree of protection against windblown dust and rain, as intended by this Proposal isnot appropriate at this time. splashing water and hose-directed water. VOTE ON PANEL RECOt~iENDATION: (g) Type 4X-Intended for indoor or outdoor use primarily to AFFIRMATIVE: 11. provide a degree of protection against corrosion, windblown dust NEGATIVE: Barker. and rain, splashing water and hose-directed water. EXPLANATION OF VOTE: (h) Type 5-Intended for indoor use primarily to provide a BARKER: The NEMA type numbers and classifications are used degree of protection against dust and falling dirt. throughout the industry wherever enclosures are used, specified (i) Type 6-Intended for indoor or outdoor use primarily to on plans, liste~d by manufacturers or suppliers. The time is provide a degree of protection against the entry of water during long past due for the Code to be consistent with the industry occasional temporary submersion at a limited depth. and give guidance on this subject. The reasoning that industry (J) Type 6P-Intended for indoor or outdoor use primarily to may revise this type of numbers is unacceptable because the provide a degree of protection against the entry of water during entire Code is always being updated and any changes in these prolonged submersion at a limited depth. types, etc., could be accepted as any other Code change. The (k) Type 11-1ntended for indoor use primarily to provide, by time to act is new. oil immersion, a degree of protection to enclosed.equipment against the corrosive effects of liquids and gases. (1) Type 12-Intended for indoor use primarily to provide a [ degree of protection against dust, falling dirt and dripping Article 372-(New): Reject CMP water. SUBMITTER: JamesM. Rice, Allen-Bradley Co. (m) Type 12K-Enclosures with knockouts intended for indoor PROPOSAL: 36 Add new article as follows: use primarily to provide a degree of protection against dust, falling dirt and dripping water other than at knockouts. ARTICLE 372°ENCLOSED APPARATUS (n) Type 13-1ntended for indoor use primarily to provide a degree'of protection against dust, spraying of water,'oil and 372-i. This article covers the general requirements for surface noncorrosive coolant. mounted enclosures for the following equipment rated nominally 372-4. Applications. Tables 372-4A and 372-4B are comparisons 600 volts or less installed in nonhazardous locations: Circuit of specific applications of indoor and outdoor enclosures. Breakers, Industrial Controls, Motor Controllers, Motor Control Centers, Panelboards, Switchboards, Switches, Transformers. Table 372-4A 372-2. Application to other articles. Equipment for use in Comparison of Specific Applications of hazardous locations shall conform to Articles 500 through 517. Enclosures for Indoor Nonhazardous Locations 372-3. Purpose of Enclosures. Enclosures shall be constructed to provide a degree of protection against accidental contact .,Prqvides a Degree of with enclosed equipment and to provide ~ degree of protection Protection Against the Type of Enclosure for the enclosed equipment against specified enviFonmental Following Environmental conditions. Conditions 1 2 4 4X'5 6 6P 11 12 12K 13 (f.p.n.) It is recognized that enclosures do not protect the Incidental contact with enclosed equipment against conditions such as condensation, the enclosed equipment X X X X X X X X X X X icing, corrosion or contamination which occur within the Falling Dirt X X X X X X X X X X X enclosure or enter via the conduit or unsealed openings. Falling l!quids and 372-5. Enclosure Types. Apparatus within the scope of this light splashing X X X X X X X X X article shall be marked with one or more of the following Dust, lint, fibers and enclosure type designations: flyings X X X X X X X X X (a) Type I, where the enclosure is intended for only indoor Hosedown and splashing use, to provide protection against contact with enclosed water X X X X equipment. Oil and coolant seepage X. X (b) Type 2, where the enclosure is intended for only indoor Oil or coolant spraying use, primarily to provide a degree of protection against limited and splashing X • nounts of falling water and dirt. Corrosive agents X X (c) Type 3, where the enclosure is intended for outdoor use, Occasional temporary primarily to provide a degree of protection against windblown submersion X X dust, rain and sleet and from external ice formation. Occasional prolonged (d) Type 3R, where the enclosure is intended for outdoor use, submersion X primarily to provide a degree of protection against falling rain and sleet and against external ice formation. (e) T)qoe 3S, where the enclosure is intended for outdoor use, primarily to provide a degree of protection against windblown

165 dust, rain and sleet and provides for operation of external' 372-11. Materials. All enclosures shall be contructed of base mechanisms when ice laden. materfals that will not support combustion in air. (f) Type 4, where the enclosure is intended for indoor 'or 372-13. Conductor Entry. When installed, conductor entry outdoor use, primarily to provide a degree of protection against fittings shall provide the some degree of environmental windblown dust and rain, splashing water and hose directed water protection as the enclosure. under specified conditions. 372-15. Operating Mechanisms. Externally operating mechanisms (g) Type 4X, where the enclosure is intended for indoor or such as those for circuit breakers or disconnect switches, and outdoor use, primarily to provide a degree of protection against other mechanisms including push-buttons and pilot lights when corrosion, windblown dust and rain, splashing water and hose installed through the enclosure wall shall provide the some directed water under specified conditions. degree of environmental protection as the enclosure. • (h) Type 5, where the enclosure is intended for only indoor use, primarily.to provide a degree of protection against dust SUBSTANTIATION: This addition to the National Electrical Code and falling dirt. will promote safety by assisting users and inspectors in (i) Type 6, ~here the enclosure is intended for indoor or determining the proper enclosure for electrical equipment for outdoor use, primarily to provide a degree Of protection against the environment. The enclosure type numbers in this article the entry of water during occasional, temporary submersion at a have been used in the trade and in industry for many years. limited depth. Despite this fact, there is confusion as to the characteristics (J) Type 6P, where the enclosure is intended for indoor or of the various type designations. Improper enclosures are the outdoor use, primarily to provide a degree of protection against source of many accidents involving injury to workers and the the entry of water during prolonged submersion at a limited large property losses. Examples of improper enclosures can be depth. cited from numerous product liability litigations. (k) Type 11, where the enclosure is intended for only indoor Electrical inspectors will find this new section particularly use, primarily to provide a degree of protection for the useful because of the clear and concise descriptions Of the enclosed equipment against corrosive liquids and gases, by types of enclosures. immersion in oil. PANEL RECOMMENDATION: Reject. (I) Type 12, where the enclosure is intended for only indoor PANEL C~MMENT: 'The CMP believes that extending the requirements use, primarily to provide a degree of protection against dust, as intended by thls Proposal is not appropriate at this time. falling dirt and dripping water. VOTE ON PANEL RECO~ENDATION:' (m) Type 12K, where the enclosure includes knockouts that are AFFIRMATIVE: 11. utilized by the installer to result in an installation NEGATIVE: Barker. equivalent to Type 12. EXPLANATION OF VOTE: (n) Type 13, wfiere the enclosure is intended for only indoor BARKER: Samecomment as Proposal No. 35. use, primarily to provide a degree of protection against dust, spraying of water, oil and noncorrosive liquids. 372-7. Indoor Aoplcations. Enclosure types appropriate for the anticipated indoor environmental conditions shall be used. ARTICLE 373 -- CABINETS AND CUTOUT BOXES Enclosures shall be selected in accordance with Table 372-7. 373: Reject . CMP 9 SUBMITTER: Eldon Hemsey, Wilmington, DE TABLE 372-7-Enc.losures for Indoor Nonhazardous Locations PROPOSAL: 37 All exterior or interior switch cabinets, having expos-oseB-uninsulated electrical (current carrying) components ENVIRONMENTAL CONDITIONS Type of Enclosure which are accessible when the cabinet door is open, shall be Provides a Degree of provided with a lock or other device to prevent children from Protection Against 1 2 4 4X566P11 12 13 opening them. SUBSTANTIATION: Many existing disconnect switches, particularly Incidental contact on exterior air conditioning condensing units, mounted on pads with enclosed equipmt.X X X XXXXXXX on the ground, are within easy reach of curious small children. Falling dirt ...... X X X XXXXXXX If these boxes can be easily opened, a child could touch the Falling liquids and / current carrying elements inside the cabinet and be electrocuted. light splashing ...... X X X X XXXX There are millions (or at least thousands).of these switch Dust, lint, fibers cabinets, mounted on air conditioning condensing units outside and flyings ...... X XXX X XX houses and garden apartment buildings all over the country, Hosedown and splashing which are not locked, so as to protect children from injury or water...... X X X X death. Oil andcoolant Perhaps local inspecting officials should be alerted to the seepage...... X X danger, and switch cabinet manufacturers required to provide a Oil or coolant child-proof door catch, In addition to the padlock hasp they spraying and ready provide. splashing ...... PANEL RECOMMENDATION: Reject. Occasional temporary PANEL COMMENT: This equipment is already provided with means submersion ...... X X for locking. Occasional prolonged VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. submersion ...... X

372-9. Outdoor Applications. Enclosure types appropriate for 373-6, 380-18 and 384-25: Accept CMP 9 the anticipated outdoor environmental conditions shall be used. SUBMITTER: a.J. Kark, National Electrical Manufacturers Assn. Enclosures shall be selected in accordance with Table 372-9. 38 Revise as follows: ~Tr3~--CNo change). TABLE 372-g-Enclosures for Outdoor Nonhazardous (a) (No change). Locations Revise title of table as follows: Table 373-6(a) - Minimum Width of Wiring Gutters and Minimum ENVIRONMENTAL CONDITIONS Type of Enclosure Wire Bending Space for 373-6(b)(I). Revise present (b) as follows: Provides a Degree of (b) Wlre Bending Space at Terminals. Wire bending space at a Protection terminal shall be provided in accordance with (1) or (2) below:. Against Ty3 Ty3R Ty3S Ty4 Ty4X Ty5 Ty6P (1) Table 373-6(a) shall apply where the conductor is substantially deflected, but not more than 90 degrees and not Incidental more than once as it leaves the terminal and .enters the gutter. contact with Table 373-6(a) shall also apply where an individual connector of enclosed equip- i the removable or lay-in type for each conductor is furnished ment...... X X X X X X X wlth the equipment or designated as suitable by marking on the Rain, snow equipment. and sleet* ...... X X X X X X X Sleet** ...... X Windblown dust .... X X X X X X Hosedown X X X X Occasional te~iporary submersion ...... X ,X bccasional I prolonged submersion ......

* External operating mechanisms are not required to be operable when the enclosure is ice covered. ** External operating mechanlsms are operable when the enclosure Is Ice covered. ".

166 dust, rain and sleet and provides for operation of external' 372-11. Materials. All enclosures shall be contructed of base mechanisms when ice laden. materfals that will not support combustion in air. (f) Type 4, where the enclosure is intended for indoor 'or 372-13. Conductor Entry. When installed, conductor entry outdoor use, primarily to provide a degree of protection against fittings shall provide the some degree of environmental windblown dust and rain, splashing water and hose directed water protection as the enclosure. under specified conditions. 372-15. Operating Mechanisms. Externally operating mechanisms (g) Type 4X, where the enclosure is intended for indoor or such as those for circuit breakers or disconnect switches, and outdoor use, primarily to provide a degree of protection against other mechanisms including push-buttons and pilot lights when corrosion, windblown dust and rain, splashing water and hose installed through the enclosure wall shall provide the some directed water under specified conditions. degree of environmental protection as the enclosure. • (h) Type 5, where the enclosure is intended for only indoor use, primarily.to provide a degree of protection against dust SUBSTANTIATION: This addition to the National Electrical Code and falling dirt. will promote safety by assisting users and inspectors in (i) Type 6, ~here the enclosure is intended for indoor or determining the proper enclosure for electrical equipment for outdoor use, primarily to provide a degree Of protection against the environment. The enclosure type numbers in this article the entry of water during occasional, temporary submersion at a have been used in the trade and in industry for many years. limited depth. Despite this fact, there is confusion as to the characteristics (J) Type 6P, where the enclosure is intended for indoor or of the various type designations. Improper enclosures are the outdoor use, primarily to provide a degree of protection against source of many accidents involving injury to workers and the the entry of water during prolonged submersion at a limited large property losses. Examples of improper enclosures can be depth. cited from numerous product liability litigations. (k) Type 11, where the enclosure is intended for only indoor Electrical inspectors will find this new section particularly use, primarily to provide a degree of protection for the useful because of the clear and concise descriptions Of the enclosed equipment against corrosive liquids and gases, by types of enclosures. immersion in oil. PANEL RECOMMENDATION: Reject. (I) Type 12, where the enclosure is intended for only indoor PANEL C~MMENT: 'The CMP believes that extending the requirements use, primarily to provide a degree of protection against dust, as intended by thls Proposal is not appropriate at this time. falling dirt and dripping water. VOTE ON PANEL RECO~ENDATION:' (m) Type 12K, where the enclosure includes knockouts that are AFFIRMATIVE: 11. utilized by the installer to result in an installation NEGATIVE: Barker. equivalent to Type 12. EXPLANATION OF VOTE: (n) Type 13, wfiere the enclosure is intended for only indoor BARKER: Samecomment as Proposal No. 35. use, primarily to provide a degree of protection against dust, spraying of water, oil and noncorrosive liquids. 372-7. Indoor Aoplcations. Enclosure types appropriate for the anticipated indoor environmental conditions shall be used. ARTICLE 373 -- CABINETS AND CUTOUT BOXES Enclosures shall be selected in accordance with Table 372-7. 373: Reject . CMP 9 SUBMITTER: Eldon Hemsey, Wilmington, DE TABLE 372-7-Enc.losures for Indoor Nonhazardous Locations PROPOSAL: 37 All exterior or interior switch cabinets, having expos-oseB-uninsulated electrical (current carrying) components ENVIRONMENTAL CONDITIONS Type of Enclosure which are accessible when the cabinet door is open, shall be Provides a Degree of provided with a lock or other device to prevent children from Protection Against 1 2 4 4X566P11 12 13 opening them. SUBSTANTIATION: Many existing disconnect switches, particularly Incidental contact on exterior air conditioning condensing units, mounted on pads with enclosed equipmt.X X X XXXXXXX on the ground, are within easy reach of curious small children. Falling dirt ...... X X X XXXXXXX If these boxes can be easily opened, a child could touch the Falling liquids and / current carrying elements inside the cabinet and be electrocuted. light splashing ...... X X X X XXXX There are millions (or at least thousands).of these switch Dust, lint, fibers cabinets, mounted on air conditioning condensing units outside and flyings ...... X XXX X XX houses and garden apartment buildings all over the country, Hosedown and splashing which are not locked, so as to protect children from injury or water...... X X X X death. Oil andcoolant Perhaps local inspecting officials should be alerted to the seepage...... X X danger, and switch cabinet manufacturers required to provide a Oil or coolant child-proof door catch, In addition to the padlock hasp they spraying and ready provide. splashing ...... PANEL RECOMMENDATION: Reject. Occasional temporary PANEL COMMENT: This equipment is already provided with means submersion ...... X X for locking. Occasional prolonged VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. submersion ...... X

* External operating mechanisms are not required to be operable when the enclosure is ice covered. ** External operating mechanlsms are operable when the enclosure Is Ice covered. ".

166 (2) In all other cases, Table 373-6(b) shall apply. Wires Per Terminal Add new table as follows: Table 373-6(b) - Minimum Wire Bending Space at Terminals forX373-6(b)(2) in Inches Wire Size 1 2 3 4 or More

AWG or Wires per Terminal Circular-Mil 14-10 Not Size of Wire I 2 3 4 Specified 8 I 1/2 14-10 Not Spec. 6 2 8-6 1 1/2 4-3 .2 1/2 4 3 2 3 I/2 3 3 1 4 I/2 - 2 3 1/2 0 5 5 7 O0 6 6 7 1/2 4 I/2 000-0000 6 1/2 6 I/2 8 0 5 1/2 5 I/2 7 250 MCM 8 8 9 10 2/0 6 6 7 1/2 300 MCM 10 10 11 12 350 MCM 12 12 13 14 3/0' 6 1/2 6 1/2 8 400-500 MCM 12 12 14 16 18 4/0 7 7 1/2 8 1/2 600-700 MCM 14 16 17 18 20 250 8 1/2 8 I/2 9 lO 750 MCM 16 19 21 23 25 800-900 MCM 18 300 I0 10 ll ~ 12 1000-1250 MCM 21 350 12 12 13 14 1500-2000 MCM 24 400 13 13 14 15

500 14 14 15 16 Bending space at terminals shall be'measured in a straight line 600 15 16 18 19 from the end of the lug or wire connector (in the direction that 700 16 18 20 22 the wire leaves the terminal) to the wall or barrier. (c) (No change). 750 17 19 22 24 SUBSTANTIATION: Several proposals were made for the 1978 Code 800 18 20 22 24 to increase wire bending space to make offset or double bends at 900 19 22 24 24 terminal points. These proposals were based on the application of a multiplier to the existing Table 373-6(a). NEMAhas I000 20 sponsored a Fact-Findlng study which Underwriters' Laboratories 1250 22 has conducted under guidance of a steering committee composed of 1500 24 electrical inspectors, industrial users and manufacturers. The purpose of the study was to establish factual data for the space 1750 24 necessary to make wire bends and to install wire into connectors. 2000 24 TheFact-Finding Report will be provided tO CI~~ g members. Based on the result of this study, NEMA proposes the above text Bending space at terminals shall be measured in a straight line for 373-6 and the additional Table 373-6(b). from the end of the lug or wire connector (in the direction that The attached tabulation* cross references values in proposed the wire leaves the terminal) to the wall~ barrier or Table 373-6(b) with the Fact-Finding Study Project number for obstruction. which test results show successful installation. * Attachments have been supplied to CHP members. 373-6(c) No change. Table 373-6(b) establishes increased bending space Add a new 380-18 as follows: requirements for: "380-18 Wire Bending Space..The wire bending space required by (1) all factory-installed connectors which are not of the Section 380-3 shall meet Table 373-6(b) spacings to the lay-in or removable type; enclosure wall opposite the llne and load terminals." (2) field-installed connectors which are not designated by Add a new 384-25 as follows: the manufacturer as part of the equipment marking. "384-25 Wire Bending Space in Panelboards. The enclosure for a No changes are proposed in Table 373-6(a) except to clarify )anelboard shall have the top and bottom wire bending space its title. This existing table has been adequate for single sized in accordance with Table 373-6(b) for the largest bends up to 90 degrees. conductor entering or leaving the enclosure. Side wire bending The values in Table 373-6(a) also apply for lay-in or space shall be in accordance with Table 373-6(a) for the largest removable-type connectors where each connector accommodates only conductor to be terminated in that space. a single conductor. This will facilitate the use of Exception: Either the top or bottom wire bending space shall field-installed connectors which may be dimensionally different be permitted to be sized in accordance with Table 373-6(a) where from the connectors Furnished with the equipment. This also at least one side wire bending space is sized in accordance with would require manufacturers to provide adequate bending space, Table 373-6(b) for the largest conductor to be terminated in electrical clearances and markings for specific types of that space." field-installed connectors. VOTE ON PANEL RECOMMENDATION: Tests 2C, 4G, 7H, lOB, I3F, 13J and 22B demonstrate that AFFIRMATIVE: 11. single conductors can be installed using removable or lay-ln NEGATIVE: Burniston. lugs when gutter space is equal to the minimu~n amount required COMMENT ON VOTE: by existing Table 373-6(a). These tests cover wire sizes from HOGAN: I have not voted negatively on this proposal, however, #2 AWI; to 750 MCM. Additional supporting tests are in process I would like to call the attention of the general public some of for conductor sizes No. 3, 1,and 2/0 AWG. the provisions of this new proposal that may cause serious PANEL RECOMMENDATION: Accept as Revised: problems in the field. 373-6 No change. 373-6(a) No change. This proposal will permit some substantial reductions in Table 373-6(a) No change. Reword the end of footnote to required bending provided a particular type of lug is utilized. read: "to the wall, barrier or obstruction." It would seem to me that it will be necessary for manufacturers Revise 373-6(b) of the 1978 NEC to read as follows: who intend that these special lugs be used with their equipment (b) Wire Bending Space at Terminals. Wire bending space at and therefore provide the smaller space permitted by this each terminal shall be provided in accordance with (I) or (2) proposal will have to install the special lugs permanently in below: such equipment so that the contractors, mechanics and inspectors (I) Table 373-6(a) shall apply where the conductor does not will know that only those lugs may be used in those enclosures. enter nor leave the enclosure through the wall opposite the There should be some public comment from all facets of the terminal. industry so that this part of the proposal can be given further Exception: Conductors which enter a second wire bending space consideration at the November meeting of C~P 9. conforming to Table 373-6(b) for that conductor. BARKER: Voting affirmative is for "something better than (2) Table 373-6(b) shall apply where the conductor enters nothing." The fact finding study proved that more bending space or leaves the enclosure through the wall opposite the terminal. is a n~ust at terminations. There is no way that the For removable (single barrel) compression (crimp) type manufacturer can control how a panel or switch is used in the terminals, bending space may be reduced'2 inches for 3/0 AWG to field as to the point of entry or exit of any conductor or 250 MCM and 3 inches for 300 to 750 MCM." raceway. Therefore, the bending space should be opposite of all terminals. Time will prove that another change and retooling Table 373-6(b). Minimum Wire Bending Space at Terminals for will be mandated by contractors, users and safety enforcement 373-6{b){2) in Inches. officials. The needs for safety is there and proven and what is available for use cannot continue to be mandated by the manufacturers of this equipment in light of the proven facts. LIEMAN: I haven't voted negatively on this proposal but would like to be on record to discuss this at our next meeting in December. It is nly view that we will get a broader reaction at our Eastern Section meeting in September as to whether this

" 167 proposal will cause any problems. Table 373-6(b) - Minimum Wire Bending Space EXPLANATION OF VOTE: in Inches in Enclosures Containin9 Terminals BURNISTON: While NEMA accepts the proposed change in Section 373-6(a) and the associated Section 373-6(b) there is no AWG or Wires per Terminal substantiation for the addition of new Sections 380-18 and Circular Mil 384-25. Section 373-6 as revised adequately covers the Wire Size 1 and 2 3 4 5 requirements for enclosed switches, circuit breakers and panelboards, and Sections 380-3 and 384-3(g) presently refer 14-10 Not Spec. 2 - back to Section 373-6. 8-6 2 3 - Proposed Section 384-25 requires two (2) gutters large enough 4-3 3 4 for the main conductors where in practically all cases this is 2 4 5 not required to adequately wire the panelboard. 1 5 8 0-00 8 10 OOO-OOOO 9 I0 250 MCM 9 12 15 Table 373-6(a)and 373-6(b): Reject CMP 9 300-350 MCM 12 16 18 SUBMI1-FER: A. C. Clark, Manufacturing Chemists Association 400-500 MCM 14 15 20 24 PROPOSAL: 39 Add new Table 373-6(a). Note that the 600-700 MCM' 16 18 22 28 ~ses and nunW)ers contained in the parentheses are the 750-900 MCM 20 21 26 32 only changes. 1000-1250 MCM 22 24 After the one sentence note to Table 373-6(a), add the 1500-2000 MCM 24 27 following. "Numbers in parentheses apply to conductors bent or deflbcted more than once. Nund)ers not in parentheses appIy to conductors bent or deflected once." Delete fine print note from Table 373-6(a) and relocate as FPN In Section 373-6(b) add the following at the end of the first to Table 373-6(b). sentence. "If a compression type pressure connector is used, SUBSTANTIATION: Supporting comments for Proposal No. 40 and 43 numbers in parentheses may be reduced to the.extent that if the Page 195 of the Preprint for the 1978 National Electrical Code compression type pressure connector were replaced with an determines that we are not mainly concerned wlth insulation approved set- screw pressure connector, the requirements in the damage when bending conductors, but with misaligument of the lay parentheses would be met." of the conductor strands which in turn cause excessive heating. SUBSTANTIATION: The need.for increased wiring space for Consequently causing further insulation damage, even fire. conductors bent or deflected more than once wasestablished Field experience has, for years, been critical of the crowded three years ago by proposals for the 1978 National Electrical bending spaces provided in enclosures containing terminals. Code. Disagreement on the amount of increased space led to the This continual arbitration with industry finally came to the appointment of a steering committee to agree upon and oversee a point of a Fact Finding Committee compiling the data that series of tests. Such tests to determine an adequate amount of actually substantiates the long sought extra bending spaces bending space are nearing completion. required to correct these field problems which have caused more Based on the results of these tests, the proposed additions to trouble than was actually anticipated by the industry. These Table 373-6(a) cover conductors which'are bent or deflected more statistics were used for basis of the proposed new,Table than once. Included for background is summary (pages I to 5) of 373-6(b). such tests along with comments. Tests were not run on alI The installation problems were found not only to exist In the bending spaces proposed. However, in view of results obtained, conductor requiring bends or offsets, but, more consideration these numbers are though~ to be reasonable. was required for the ones that are directed straight into the The intent of the proposed addition to Section 373-6(b) is to terminals, thus, more bending space for al) the conductors in not penalize those wishing to use compression type pressure the enclosures is needed. connectors. These connectors are often longer than set-screw PANEL RECOI~ENDATION: Reject. pressure connectors. In many instances, purchased equipment PANEL COI~ENT: See Panel action on Proposal No. 38. comes equipped with set-screw pressure connectors and VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. replacement of these with compression type is sometimes impossible because of inadequate space per Table 373-6(a). PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 38. 373-6(b) and (c): Reject Cl@ 9 VOTE ON PANEL RECO~MENDATION: Unanimously Affirmative. SUBMITTER: Ralph H. Lee, Lee ElectrAcal Engineering, Inc. ~41 Revise as follows: ~pace for single bend at terminals. Conductors required Table 373-6(a) -- Minimum Wire Bending Space at Terminals to be bent in one bend not exceeding 90° shall require bending and Minimum Width of Wiring Gutters in Inches space in accordance with Table 373-6(a). Change(c) to (d)and C add new (c) as follows: AWG (c) Space for additional bends at terminals. Conductors Circular-Mil Wires per Terminal required to be bent in more than one bend, such as an S-bend Size of Wire 1 2 3 4 5 condition, shall be accorded bending space of two times 'that shown In Table 373-6(a). SUBSTANTIATION: Table 373-6(a) is properly based on conductors 14-10 Not Specified ...... leaving a terminal, making one 90a bend along the side gutter of 8-6 1½ (2) ...... a panelboard cabinet, and exiting from top or bottom of the

43 2 ...... cabinet. As such, It properly specifies the allowance of space 2 2~ ...... for this bend in accordance with the permitted bending radii of 1 3 (4~) ...... the varlous-sized wires and conductors as set forth by IPCEA, 0-00 3~i (6) 5-(6,) 7 (8) .... that body most knowledgeable about the susceptibility of wires ooo-oooo 4 (7,) 6 (8) 8 l~I -" and cables to the various installation problems. 250 MCM 4~ (9) 6 (9) 8~ 10 (10) -- In the absence of any other table in NEC regarding termlnal-to-side-wall spacing, this table has been applied 400-s00 '.CM 6 10 12 ~; without modification to all terminal sldewall/spacings, 600-700 MCM 8 (16)l ol 10 !iil 12 (19) 14 (20) 16 I :l ~egardless of the need for additional bends. The great majority 750-900 MCM 8 (20) 12 (22) 14 (24) 16 (26) 18 (26) of uses in switches, circuit breakers and similar gear, requires 1000-1250 MCM 10 (22) ...... that two of the three wires be formed into S-bends to accomodate 1500-2000 MCM 12 (24) ...... the separation of terminals and the exit of the conductors, through a single conduit or bushing. In these many cases, the double bend must be cramped into the space which is properly specified for only a single bend. Over-sharp bending of cables Table 373-6(a), 373-6(b), CMP g at terminals, and In pressure against wlre insulation are major New Table 373-6(b): Reject results. Both of these are serious sources of failures which SUBMITTER: IdahoChapter IAEI can be responsible for fires. C 40 Revise title of Table 373-6(a) as follows: Sln~)le short-time tests of over-sharp bending Just to show "it ~m Width of Wiring Gutters in Inches. can be done" can never be condoned as reason for retaining this Revise (b) and add new Table 373-6(b) as follows: monstrosity in the Code, any more than short-term testing could (b) Wire Bending Space at Terminals. Conductors shall not be Justify the use of EC aluminum wiring in'residences. Any deflected at a terminal unless bending space within a cabinet or Journeyman electrician knows that the biggest problem in cutout box is provided In accordance with Table 373-6(b). electrical installation Is the crowded termination space, Conductors in parallel in accordance with Section 310-4 shall be requiring excessively sharp conductor bending; Judged on the basis of the number of conductors in parallel. this is shown from a questionnaire published a few years ago. So why, if Table 373-6(a) spacings are required for their real intent, single bends, does the Code not require double these values for double bends? PANEL RECOI~ENDATION: Reject. PANEL COGENT: See Panel action on Proposal No. 38. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative.

168 373-6(c)-(New)(HOD 1978 NEC): Reject CMP 9 373-1?-(New): Reject CMP g SUBMITTER: CMP 9 SUBMITTER: Southwestern Section IAEI PROPOSAL: 42 AmendSection 373-6 by adding thereto a new PROPOSAL: 47 Add new section as follows: su--Gb-T~ETon (c) as follows: ~TrJTI'2T-. Equipment On Cabinet Door. No device or other (c) The provisions of subsections (a) and (b) of this section equipment utilizing electric wiring shall be mounted on or be apply to conductors bent or deflected no more than once. For supported by any cabinet or panelboard trim, cover or door - conductor bending space at terminals and width of gutter space except where hinged doors designed for the purpose are employed. for conductors that are bent or deflected more than once, the SUBSTANTIATION: Switches, pushbuttons, pilot lights and similar gutter or bending space required shall be one and one half times • control circuit equipment which might be mounted on a reFnovable the value listed In Table 373-6(a). Present subsection "(c)" cabinet cover can offer a severe shock hazard to maintenance w111 become "(d)." personnel. Usually the screws holding the cover in place SUBSTANTIATION: We were convinced by the supportlng comment provide the equipn~nt grounding, which means that a man removing supplied wlth Proposal No. 39 in the 1978 Preprlnt. the cover has an ungrounded piece of equipment in hls hand. PANEL RECOMMENDATION: Reject. Furthermore, switches for disconnecting the control circuits are PANEL COGENT: See Panel action on Proposal No. 38. often within the cabinet, making it difficult to de-energize the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. circuit. If the cover slips during the process of removal, a live exposed terminal can be grounded to the side of the enclosure. PANEL RECOMMENDATION: Reject. 373-10(a): Accept CMP 9 PANEL COMMENT: Supporting comment is not persuasive as to SUBMITTER: TSC-Approved for the Purpose necessity. PR'O-~(5~_-T." 43 See the Technical Subcommittee "Recommendations" VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. un--6-de-~'-t~f~e definition of "Approved for the Purpose" in Artlcle 100. ) SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" In Article 100. 373-X:. Reject CMP 9 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: Ralston W. Calvert, Dept. Bldg. & Safety, City of i Delete the words "and shall be approved for the purpose." P-al~--O'es-ert VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: 48 Add a new paragraph to Article 373 (Installation) ~h-TcTi--s~all say "Cabinets or cut boxes located in wall or other places, shall not be installed less than two feet nor more than 6 I/2 feet vertically from the ground floor, concrete slab or 373-10(c): Reject CMP 9 roof). SUBMITTER: Patrick J. Fox, St. Louis, MO Exception: Cabinets and cut out boxes located in vaults or PIIIS]IO'S'~-~.• 44 Changeparagraph to read: other approved locations." ~-~ Nonmetallic Cabinets and Cutout Boxes. Nonmetallic SUBSTANTIATION: cabinets and cutout boxes shall be approved for the purpose. I. An overcurrent protective device being used to protect an SUBSTANTIATION: This is intended to make the statement air conditioning unit. The OPD enclosure was located one inch consistent with the statement for metal cabinets and cutout above the ground, the cover of the enclosure hinged on top. • boxes and with Section 370-3. To require submittal for approval When the cover was opened, the manufacturer's specifications and of every nonmetallic cabinet and box appears unnecessary if they the directory could not be read. I had to lie on my stomach to are approved for the purpose. inspect the equipment and on my back to read the manufacturer's • This was previously submitted for the 1975 National Electrical specifications and directory...(and that's when the sprinkling Code and a Task Group was to have studied this proposal change. system came on). PANEL RECOMMENDATION: Reject. 2. A sub-panel located three inches above a patio concrete PANEL COMMENT: Present Code wording is necessary until slab. To inspect the installation, I had to lie on the slab as standards are written. the cover was hinged on top. It was also difficult for the VOTE ON PANEL RECOMMENDATION: owner to see the circuit breakers, as the cover partially AFFIRMATIVE: 11. blocked his view. Whenever the patio was hosed off, which was NEGATIVE: Cramer. often, the enclosure was drenched with water. EXPLANATION OF VOTE: 3. An overcurrent protective device and its enclosure was CRAMER: The existing Section required approval prior to located on a flat roof. The enclosure was two inches above the installation. Approval after installation should suffice. roof. To inspect the job or to work on the equipment, a most Sentence should read: "Norm~tallic cabinets shall be suitable difficult and tiring position must be maintained. A man wearing for the environment." glasses would be in a dangerous position, due to the required I tilt of his head, leading to poor vision, thereby contributing to a possible accident. PANEL RECOMMENDATION: Reject. 373-11(a)(3); Accept CMP g PJ~NE[ COMMENT: Supporting comment is not consistent with the SUBMITTER: TSC-Neminal Voltage Proposal. P]TOlIO-~lZ~.'45 Change "600" in last line to "635." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~IATION: To conform to the method to express maximum COGENT ON VOTE: voltage as per, guldellnes developed by the TSC on nominal CRAMER: I agree with the reject but feel.~hat the reason is voltage. that this is getting into design considerations and away from PANEL RECOMMENDATION: Accept as Revised: safety. To attempt to set limits that universally apply to Leave 600 as is, but insert the word "nominal" after "600." every installation is very difficult. The inspecting authority VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. can judge the equipment in accordance with Section 110-3 and has the power to reject.

373-12-{New): Reject CMP 9 SUBMITTER: R. S. Pinkerton, Los Angeles, CA ARTICLE 380 -- SWITCHES ]~ffO-P'O~-~ 46 Add a new section as follows: ~7"c[zT'ZT-. Equipment on Cabinet Door. No device or other 380-2(b): Reject ~ CMP 9 equipment utilizing electric wiring shall be mounted on or be SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI supported by any cabinet or panelboard trim, cover or door - PITOIR)'S'A-L-~." 49 Revise as follows: except where hinged doors designed for the purpose are employed. ~r switches nor circuit breakers shall disconnect the SUBSTANTIATION: Switches, pushbuttons, pilot lights and similar grounded conductor of a circuit. control circuit equipment which might be mounted on a removable SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without cabinet cover can offer a severe shock hazard to maintenance the correlation of 'either.' In many instances, this usage is personnel. Usually the screWs holding the cover in place not only gra~matically incorrect, but the meaning is not clear. provide the equipment grounding, which means that a man removing PANEL RECOMMENDATION: Reject. the cover has an ungrounded piece of equipment in his hand. PANEL CO~g4ENT: Panel feels subject is adequately covered. Furthermore, switches for disconnecting the control circuits are VOTE ON PANEL RECOV~ENDATION: Unanimously Affirmative. often within the cabinet, making it difficult to de-energize She circuit. If the cover slips during the process of ren~)val, a live exposed terminal can be grounded to the side of the enclosure. 380-2(b), Exception No. 1: Reject CMP g PANEL RECOf~ENDATION: Reject. SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI PANEL COMMENT: Supporting comment is not persuasive as to PROPOSAL: 50 Revise as follows: necessity. ~either the switch or the circuit breaker etc. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without the correlation of 'either.' In many instances, this usage is not only grammatically incorrect, but the meaning is not clear. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Panel feels subject is adequately covered. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

169 SUBSTANTIATION: See the TSC "findings" under the definition of Chapter 9 Table l, Note 5: Accept CMP 8 "Approved for the Purpose" in Article 100. SUBMITTER! CMP 8 PANEL RECOMMENDATION: Accept as Revised: !aITOPOS'7~-~.• 175A Add to Note 5 the word "maximum" before I Delete the words "approved for the purpose" and add the word ~e." Add FPN after Note 5 to read: "Approved" at the the beginning of the sentence. Table l is based on common conditions of proper cabling and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. alignment of conductors where the length of the pull and the number of bends are within reasonable limits. It should be recognized that for unusual conditions a larger size conduit or a lesser conduit fill should be considered. ARTICLE 374 -- AUXILIARY GUTTERS SUBSTANTIATION: Clarification. PANEL RECOMMENDATION: Accept. 374-9(f)-(New): Reject CMP 8 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: S. D. Mauney, Carolina Power & Light Company PHUPU~AL: 173 Add new (f) as follows: -~here an auxiliary gutter is to contain bends or taps to an electric supplier's service conductors larger than No. i AWG, Table l, Chapter g: Reject CMP 8 its width at the cover shall be at least 200 percent of that SUBMITTER: CMP 8 given in Table 373-6(a) and its minimum depth from cover to back 175B In the 3 conductor column, delete 40 (percent shall be 100 percent of the width given in Table 373-6(a). ~d insert 33 (percent fill) for both lead covered and Where the size of the supplier's service conductors is not non-lead covered conductors. readily available, the conductor size may be calculated as the SUBSTANTIATION: There exists a l~ttle understood problem of equivalent size of the largest aluminum conductors with a 75°C "jam ratio" where only three conductors are installed in a ampacity rating equal to the sum of the service overcurrent conduit. This is ratio of the diameters of the conduit and the devices tapped to the supplier's service conductors. In the single conductor (D/d). This ratio is critical between 2.5 and table, "Wires per terminal" is to be used to indicate the number 3.0 where the conductors are not triplexed. At a ratio of 3.0 of the supply service conductors in parallel per phase. and greater, the conduit is wider than the sum of the 3' SUBSTANTIATION The required width of the auxiliary gutters used conductors which prevents Jamming. on surv~ces for taps to several or more meter or service At this ratio the area of the conductors is 3d2~ equip(nent cabinets is inadequate dn many instances. No stated minmum depth is required. Due to the stiffness and size of the service conductors and to the large size of taped connectors, the connections are under pressure from adjacent conductors, The area of the conduit is (3d)2 = 9d2~ connectors, and the gutter cover. Even the best tapes are subject to abrasion due to expansion L ~ ---I-- and contraction of the conductors with the load cycle. They Fill = 3/9 = 33 1/3 percent. also soften due to heat. Shorts occur when the tape is abraded At 40 percent fill the maximum allowable conductors are always away or softened abnormally. More space will help connections in the critical Jam ratio. to be positioned away from each other and from the cover. The PANEL REC~NDATION: Reject. proposed size is minimum. Experience may indicate that larger PANtL ~UMM~NI: UMP ~ would prefer to withdraw the Proposal and sizes may be needed. It is rejected on that basis. More space is also needed as/additional taps are made to the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.. service conductors. This is ~specially true of commercial buildings with movable walls where the number, size, and loads of the occupancies is ever changing. Space is also needed when loads are checked with cllp-on ammeters, etc. Chapter 9, Table l, Note 6: Reject CMP 8 Increasing the size of service gutters is already often done SUBMITTER: CMP 8 by some electricians Who realize that the savings in PROPOSAL: I75C Add a new Note 6 as follows: installation labor and maintenance easily offset the additional ~ill shall be permitted for triplexed conductors." material cost involved. SUBSTANTIATION: Clarification. Safety is involved anytime a filled gutter is opened for PANEL RECOMMENDATION: Reject. inspection or to make changes as removing the cover allows the PANEL COMMENT: See Panel Comment on Proposal No. 175B. spring action of the cramped VOTE ON PANEL RECOI¢MENDATION: Unanimously Affirmative. conductors to come into play. Closing the cover puts additional pressure on the connections. PANEL RECOI~4ENDATION: Reject. PANEL COMMENT: Already covered by Section 374-9(d). Training Table 1, Chapter 9: Reject CMP 8 space is being studied by Panel 9. SUBMITTER: Joseph M. Ostrlhonsky, Sioux City, IA VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: ,176 I suggest that the number of wires that is a-lT6~--d-in 1/2 inch and 3/4 inch pipe be reduced to half. The wire I'm talking about is TW, THHN, THWN, sizes #12, #14, and #10. As an alternate, they would change the 40 percent fill to CHAPTER 9 -- TABLES AND EXAMPLES 60 percent fill based on individual diameters. SUBSTANTIATION: If you have had any experience at all, you will Chapter 9, A. Tables, Note 2: Reject CMP 8 know that is It very difflcult to pull, say 9-12 inch TW wires SUBMITTER: Peter Pollak, The Aluminum Association into a piece of 1/2 inch conduit. It is almost impossible if I~OFOSAL-~. 174 In the second sentence of Note 2, replace you havetwo go° bends in the conduit. This Js why I think they ~-~ted or bare)" with "(insulated, bare or compact)." should reduce the number of wires or else change the percent SUBSTANTIATION: Question arises in the field regarding the fill of the conduit. selection of the proper conduit size for the application. PANEL RECOMMENDATION: Reject. Makes clearer the fact that the actual dimensions of compact PANEL CL)f~ENI: ine "conduit fill tables are based on the concept equipment grounding conductor shall be used in the calculation that a safe practical.conduit fill percentage is one in which of conduit fill. the diameter of a circle circumscribed around the assembled PANEL RECOI~4ENDATION: Reject. conductors would approximate 75 percent of the conduit PANEL COMMENT: Proposal is pcimarily a design consideration. diameter. The net area of the conductors within this VOTE ON PANEL RECOMMENDATION: theoretical circle approximates 40 percent fill. AFFIRMATIVE: 14. The Code establishes a 40 percent maximum conduit fill. The NEGATIVE: Durham. Code also establishes a maximum of four quarter bends (360 EXPLANATION OF VOTE: degrees total). The Code does not establish a maximum length of DURflAM: Panel action is not consistent with Proposal No. 175. pull. The allowable length of a pull is contingent on a number of factors including but not limited to: I) maximum allowable conductor tension, 2) the plane of the bends (whether they are horizontal or vertical and whether any are reverse bends), 3) Chapter 9., A. Tables, Note 4: Accept CMP 8 proper cabling of the conductors, 4) the weight of the cable, 5) SUBMITTER: Peter Po'llak, The Aluminum Association the coefflcent of friction between the conductors and the I PRUPU~AL 175 In Note 4 insert "such as compact or conduit, and 6) sidewall pressure. i = ~ductor cables," after "Chapter 9.' Since the Code is not a design manual Judgement must be used ' SUBSTANTIATION: Question arises in the field regarding the in studying all of these "factors on whether.to use the maximum selection of the proper conduit size for the application. fill and the maximum number of bends to accommodate the maximum Makes clear the fact that actual dimensions of compact or length of pull. Proper cabling of a large number of conductors multlconductor cables shall be used in the calculation of is of extreme importance in such a Judge~nt. condu'i t fill. VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

158 373-6(c)-(New)(HOD 1978 NEC): Reject CMP 9 373-1?-(New): Reject CMP g SUBMITTER: CMP 9 SUBMITTER: Southwestern Section IAEI PROPOSAL: 42 AmendSection 373-6 by adding thereto a new PROPOSAL: 47 Add new section as follows: su--Gb-T~ETon (c) as follows: ~TrJTI'2T-. Equipment On Cabinet Door. No device or other (c) The provisions of subsections (a) and (b) of this section equipment utilizing electric wiring shall be mounted on or be apply to conductors bent or deflected no more than once. For supported by any cabinet or panelboard trim, cover or door - conductor bending space at terminals and width of gutter space except where hinged doors designed for the purpose are employed. for conductors that are bent or deflected more than once, the SUBSTANTIATION: Switches, pushbuttons, pilot lights and similar gutter or bending space required shall be one and one half times • control circuit equipment which might be mounted on a reFnovable the value listed In Table 373-6(a). Present subsection "(c)" cabinet cover can offer a severe shock hazard to maintenance w111 become "(d)." personnel. Usually the screws holding the cover in place SUBSTANTIATION: We were convinced by the supportlng comment provide the equipn~nt grounding, which means that a man removing supplied wlth Proposal No. 39 in the 1978 Preprlnt. the cover has an ungrounded piece of equipment in hls hand. PANEL RECOMMENDATION: Reject. Furthermore, switches for disconnecting the control circuits are PANEL COGENT: See Panel action on Proposal No. 38. often within the cabinet, making it difficult to de-energize the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. circuit. If the cover slips during the process of removal, a live exposed terminal can be grounded to the side of the enclosure. PANEL RECOMMENDATION: Reject. 373-10(a): Accept CMP 9 PANEL COMMENT: Supporting comment is not persuasive as to SUBMITTER: TSC-Approved for the Purpose necessity. PR'O-~(5~_-T." 43 See the Technical Subcommittee "Recommendations" VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. un--6-de-~'-t~f~e definition of "Approved for the Purpose" in Artlcle 100. ) SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" In Article 100. 373-X:. Reject CMP 9 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: Ralston W. Calvert, Dept. Bldg. & Safety, City of i Delete the words "and shall be approved for the purpose." P-al~--O'es-ert VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: 48 Add a new paragraph to Article 373 (Installation) ~h-TcTi--s~all say "Cabinets or cut boxes located in wall or other places, shall not be installed less than two feet nor more than 6 I/2 feet vertically from the ground floor, concrete slab or 373-10(c): Reject CMP 9 roof). SUBMITTER: Patrick J. Fox, St. Louis, MO Exception: Cabinets and cut out boxes located in vaults or PIIIS]IO'S'~-~.• 44 Changeparagraph to read: other approved locations." ~-~ Nonmetallic Cabinets and Cutout Boxes. Nonmetallic SUBSTANTIATION: cabinets and cutout boxes shall be approved for the purpose. I. An overcurrent protective device being used to protect an SUBSTANTIATION: This is intended to make the statement air conditioning unit. The OPD enclosure was located one inch consistent with the statement for metal cabinets and cutout above the ground, the cover of the enclosure hinged on top. • boxes and with Section 370-3. To require submittal for approval When the cover was opened, the manufacturer's specifications and of every nonmetallic cabinet and box appears unnecessary if they the directory could not be read. I had to lie on my stomach to are approved for the purpose. inspect the equipment and on my back to read the manufacturer's • This was previously submitted for the 1975 National Electrical specifications and directory...(and that's when the sprinkling Code and a Task Group was to have studied this proposal change. system came on). PANEL RECOMMENDATION: Reject. 2. A sub-panel located three inches above a patio concrete PANEL COMMENT: Present Code wording is necessary until slab. To inspect the installation, I had to lie on the slab as standards are written. the cover was hinged on top. It was also difficult for the VOTE ON PANEL RECOMMENDATION: owner to see the circuit breakers, as the cover partially AFFIRMATIVE: 11. blocked his view. Whenever the patio was hosed off, which was NEGATIVE: Cramer. often, the enclosure was drenched with water. EXPLANATION OF VOTE: 3. An overcurrent protective device and its enclosure was CRAMER: The existing Section required approval prior to located on a flat roof. The enclosure was two inches above the installation. Approval after installation should suffice. roof. To inspect the job or to work on the equipment, a most Sentence should read: "Norm~tallic cabinets shall be suitable difficult and tiring position must be maintained. A man wearing for the environment." glasses would be in a dangerous position, due to the required I tilt of his head, leading to poor vision, thereby contributing to a possible accident. PANEL RECOMMENDATION: Reject. 373-11(a)(3); Accept CMP g PJ~NE[ COMMENT: Supporting comment is not consistent with the SUBMITTER: TSC-Neminal Voltage Proposal. P]TOlIO-~lZ~.'45 Change "600" in last line to "635." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~IATION: To conform to the method to express maximum COGENT ON VOTE: voltage as per, guldellnes developed by the TSC on nominal CRAMER: I agree with the reject but feel.~hat the reason is voltage. that this is getting into design considerations and away from PANEL RECOMMENDATION: Accept as Revised: safety. To attempt to set limits that universally apply to Leave 600 as is, but insert the word "nominal" after "600." every installation is very difficult. The inspecting authority VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. can judge the equipment in accordance with Section 110-3 and has the power to reject.

169 380-2(b), Exception No. 2: Reject CMP 9 SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI the correlation of 'either.' In many instances, this usage is ]~TO-FO-S~A[~-.• 51 Revise as follows: not only grammatically incorrect, but the meaning is not clear. ~here either the switch or the circuit breaker etc. PANEL RECOI~4ENDATION: Accept. ' SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without PANEL COMMENT: Sane as Proposal No. 56. the correlation of 'either. In many instances, this usage is VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. not only grammatically incorrect, but the meaning is not clear. COMMENT ON VOTE: PANEL RECOMMENDATION: Reject. CRAMER: Samecomment as Proposal No. 56. PANEL COMMENT: Panel feels subject is adequately covered. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

380-11: Reject CMP 9 SUBMITTER: R. S. Pinkerton, Los Angeles, CA 380-3: Accept CMP 9 PITOPO'S'~[L-T." 58 Add a sentence as follows: SUBMITTER: TSC-Approved for the Purpose The supply conductors of single circuit breakers in non-bussed 52 See the Technical Subcommittee "Recommendations" enclosures shall be connected to the terminals nearest the on un-~-d-e~"the definition of "Approved for the Purpose" in Article position of the operating handle. 100. SUBSTANTIATION: The proposed connection configuration for SUBSTANTIATION: See the TSC "findings" under the definition of circuit breakers in enclosures has been an industry standard for "Approved for the Purpose" in Article 100. EXO switches for many years. Accordingly, electricians assume PANEL RECOMMENDATION: Accept as Revised: that the load conductors are connected nearest the off Revise the first sentence of 380-3 to read: "Switches and position. The purpose of this requirement has nothing to do circuit breakers shall be of the externally operable type with the operation of a circuit breaker as it will function mounted in an enclosure listed for the intended use." properly connected either way. Workmen have been injured when VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. they attempted to remove what they thought was a de-energlzed COf~ENT ON VOTE: load conductor because it was connected to the load side, (near BARKER: For listing, who determines the intended use? the off side), and it turned gut to be a line conductor. This requirmentprovldes a necessary safety precaution for maintenance personnel and equipment installers. PANEL RECOMMENDATION: Reject. 380-4: Reject CMP 9 PANEL CO~4ENT: No significant contribution to safety would SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI result. This Proposal would lend itself to a false sense of 53 Revise as follows: security. ~rO'Zir~-~et Locations. Where elther a switch orj a circuit VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. breaker (or both) is installe~ in a wet location shall be enclosed in a weather proof enclosure which complies with Section 373-2. Note: Wet Iocation-definitioo includes outside buildings and 3BO-13(a) and (b): Accept CMP g exposed to the weather. Section 373-2 includes both cabinets SUBMITTER: TSC-Nominal Voltage and enclosures. ~59 In the second lines of (a) and (b) change "600" SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without to ~" the correlation of 'either.' In many instances, this usage is SUBSTANTIATION: To conform to the method to express maximum not only grammatically incorrect, but the meaning is not clear. voltage as per guidelines developed by the TSC on nominal PANEL RECOMMENDATION: Reject. voltage. PANEL COMMENT: Panel feels subject is adequately covered PANEL RECOMMENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 380-13(a) No change. Insert the word "nominal" after 250 volts and after 600 volts in Section (b). PANEL COMMENT: The voltages expressed are rated voltages. ° ~RECOMMENDATION: Unanimously Affirmative. 380-6(b): Accept CMP 9 COMMENT ON VOTE: SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI CRAMER: I agree with the action. The reason for the action 54 Revise the last sentence as follows: is that the voltage expressed in (a) are rated voltages whereas ~the throw is vertical, a locking device shall be in (b) voltages are nominal. provided to hold the blades in the open position when sO set. 'SUBSTANTIATION: NFPA70-1978 uses the word 'or"loosely without the correlation of 'either.' In many instances, this usage is not only grammatically incorrect, but the meaning is not clear. 380-13(b): Accept CMP g PANEL RECOMMENDATION: Accept. SUBMITTER: TSC-Approved for the Purpose PANEL COMMENT: We agree with the proposal, although his Pl~-OIR~-~.'60 See the Technical Subcemmittee "Recon~nendations" substantiation is not clear. un-n-d~-~-t-~e definition of "Approved for the Purpose" in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I00. SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: 380-6(b): Accept CMP 9 Substitute the word "listed" for "approved." SUBMITTER: SouthwesternSection IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 55 Revise the last sentence to read: ~the throw is vertical, a locking device shall be provided to hold the blades in the open position when so set. SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without 380-14ia)(2): Reject CMP g correlation of 'either.' In many instances, this usage is not SUBMITTER: J.J. Kark, National Electrical Manufacturers only gramatically incorrect, but the meaning is not clear. ~on PANEL RECOMMENDATION: Accept. PROPOSAL: 61 Reviseto read: PANEL COMMENT: Same as Proposal No. 54.. We agree with the --'-T~Tungsten-filament lamp loads not exceeding the ampere proposal, although his substantiation is not clear. rating of the switch at 120 volts "for single-pole, double-pole, VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. 3-way, and 4-way switches." SUBSTANTIATION: The present wording does not recognize that AC type switches are designed for other than lighting loads. Examples of switch actions not requiring tungsten test include: 380-8(a): Accept CMP g 3 position switches, momentary contact switches and maintained SUBMITTER: Ernest E. Cannon, Arizona Chapter IAEI contact switches. These are used in Start-Stop circuits, .~ 56 Revise the first sentence by adding "so" between Ralse-Lower circuits, etc. where the tungsten requirements are T~--aITl)e" and "located." not applicable. The des!gn parameters of these type switches SUBSTANTIATION: NFPA70-1978 uses the word 'or' loosely without differ greatly from those used for tungsten loads. the correlation of 'either.' In many instances, this usage is Underwriters Laboratories interprets the present code wording not only grammatically incorrect, but the meaning is not clear. to require tungsten tests on all AC switches regardless of end PANEL RECOMMENDATION: Accept. use. The requested change would allow manufacturers to design VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. switch mechanisms to optimum performance as required by the end COMMENT ON VOTE: use. CRAMER: I agree because he's grammatically correct although PANEL RECOI~dENDATION: Reject. his substantiation is no good. : e anel does not agree with the supporting comment. The switches mentioned in the substantiation could be used for tungsten loads. VOTE ON PANEL RECOMMENDATION: 3BO-B(a): Accept CMP 9 AFFIRMATIVE: 10. SUBMITTER: SouthwesternSection IAEI NEGATIVE: Burniston, Demlng. .~ 57 Revise the first sentence by adding "so" between EXPLANATION OF VOTE: I• ~ and located. J BURNISTON: As the proposal indicates, the concern Is with 170 /

other than standard single pole, double pole, 3-way and 4-way 384-1. Scope. This Article covers (1) all switchboards, switches used in lighting control circuits. The specific panelboards, distribution boards, and LV swttchgear switches covered by this proposal are a variety of either (metal-enclosed low-voltage power circuit breaker switchgear) maintained or momentary contact switches of one, two or three installed for the control of --- power circuits. position single or double pole. The loads being controlled are Exception: (No change). either resistance or inductive loads, but not tungsten loads. Add (now) 384-X: (The Panel was supplied the more typical diagrams.) 384-X. LV Switchgear (Metal-Encased Low-Voltage Power Circuit The Code has been interpreted as requiring all genera] Breaker Switchgear). An assembly of one or more. individual switches to be tungsten rated, which inhibits design. enclosures containing the follOwing equipment as required: Clartflcatton is required to exempt these special use AC Low-voltage po~cer circuit breakers (fused or unfused); .bare bus switches to allow the use of designs which maximize the and connections; instrument and control power transformers, performance on the intended loads. instruments, meters, and relays, control wiring and accessory DEMING: The switches mentioned in the substantiation could be devices. marked'"Not suitable for tungsten loads." The low-voltnge power circuit breakers are contained in There are many instances within the Code where a product individual grounded metal con~artments and controlled either misused or used for the wrong purpose could create a hazardous ramotely or from the front of the enclosure. The circuit condition. breakers may be stationary or removable type; when of removable type, mechanical Interlocks are provided to ensure a proper and safe operating sequence. LV swttchgear assemblies are totally enclosed with no exposed 380-14(a)(4): Accept CMP 9 live parts. SUBMITTER: TSC-Approved for the Purpose Revise 384-2: 62 See the technical Subcommittee "Recommehdations" 384-2. Other Articles. Switches, circuit breakers, and un--n-d'e'r't~Te definition of ~Approved for the Purpose" in Article overcurrent de, ices used on switchboards, panelboards, 100. distribution boards, or LV swltchgear, and their enclosures, SUBSTANTIATION: See the TSC "findings" under the definition of shall comply ...... that apply. Switchboards ...... through "Approved for the Purpose" in Article 100. 517. PANEL RECOMMENDATION: Accept as Revised: Revise 384-3(a): Change 380-14(a)(4) to 380-14(c) and revise to read as (a) Conductors and busbars on a power switchboard, panelboard, follows: "(c) CO/ALR Snap Switches. Snap switches rated 20 control board, or LV swttchgear shall be so located ...... amperes or less directly connected to aluminum conductors shall place. Other than the required ...... in a vertical section of be listed and marked CO/ALR." a power switchboard or LV switchgear shall be located In that VOTE ON PANEL RECOMMENDATION: section. Barriers shall be placed in a11 service power AFFIRMATIVE: 11. switchboards and LV swttchgear that will isolate .... remainder NEGATIVE: Burnlston. of the equtp~nt. EXPLANATION OF VOTE: Revise 384-3(c): BURNISTO~I: ~MA has no objection to the Panel Recemmendatlon (c) Each power switchboard, LV swttchgear, power switchboard to revise the text of Section 380-14(a)(4), but feels that or LV swttchgear section, or panelboard, tf used ...... to the relocating this Section to now Section 380-14(c) goes beyond the equipment frame; All sections of a power switchboard or LV Panel's intent. switchgear shall be bonded ...... Table 250-95. The Pane] did not intend to imply that CO/ALR snap switches Revise 384-3(d): are suitable for use on other than AC circuits wfien connected to (d) Load terminals in power switchboards, panelboards, and LV aluminum conductors, nor that their suitability should go beyond switchgear shall be ...... connections. those uses covered under Section 380-14(a). The location of the Revise 384-3(e): 'recommended text should remain as Section 380-14(a)(4). (el On a power switchboard, panelboard, or LV switchgear supplied from a ...... marked. Revise 383-3(f): (f) The phase arrangement --z--- the front of the power 380-16: Accept CMP 9 switchboard, panelboard, or LV switchgear.' The B phase SUBMITTER: TSC-Nominal Voltage ...... ground. Other busbar ...... marked. ~63 ' Revise the end of the second llne and beginning Revise Part A Title: o--'f'-TF~rF-d line to read "knife switch rated600 volts, etc." A. Switchboards and LV switchgear SUBSTANTIATION: To conform to the method to express rated Revlse384-7: voltage of equipment as per the guideline developed by the TSC 384-7. Clearance from Ceiling. A space -~ .... of any on nominal voltage. switchboard or LV switchgear ...... ceiling. PANEL RECOMMENDATION: Accept as Revised: Exception No. 1: Where a ..... the switchboard or I Change the word "switch" to "switches." LV swltchgear and the ceiling. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Excepttoh No. 2: Totally enclosed switchboards and LV swltchgear. Revise 384-8: 384-8. Clearances Around Switchboards and LV Switchgear. 380-17, Exceptlon-(New): Reject CMP 9 Clearances around switchboards and LV switchgear shall ..... SUBMITTER: W. Crelghton Schwan, Hayward, CA Section 110-16. 64 Add a new exception as follows: Revise 384-10: --~lon: Fuses factory assembled in parallel, as permitted 384-10. Clearances for Conductors Entering Bus Enclosures. in the Exception to Section.240-8. Where conduits or other raceways enter a power switchboard, or SUBSTANTIATION: The proposed revision will remove a conflict LV switchgear, floor standing panelboard, ...... enclosure. The from.the Code. High voltage fuses have long been recognized in wiring ...... obstructions. The conduit ...... enclosure. parallel when assembled in a common mounting means designed for the purpose (see Section 710-21(b)(1)). (Table) Section 240-8 was revised in the 1978 NEC to recognize fuses ...... factory assembled in parallel. If fuses in parallel are ...... recognized by the Code, the same Code must a11ow a switch to accemodate them. Revise 384-11: PANEL RECOMMENDATION: Reject. 384-11. Grounding Power Switchboards and LV Switchgear Frames. PANEL COMMENT: See Panel action on Proposal No. 65. Power switchboard or LV switchgear frames and ...... grounded. • VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Exception: Frames of direct-current single-polarity power switchboards and LV switchgear shall not ...... insulated. Revise 384,12: 384-12. Grounding of Instruments, Relays, Meters, and 380-17-FPN (NEW): Accept CMP 9 Instrument transformers onSwltchboards and LV Switchgear. SUBMITTER: IdahoChapter IAEI Instruments, ...... located on switchboards or LV swltchgear ~65 Add a FPN to 380-17 to read: See 240-8, shall be ...... through 250-125. ~'~n. SUBSTANTIATION: Article 384 does not presently include SUBSTANTIATION: For the purpose of better correlation in the reference to LV switchgear which is also a product designed for field. the control of light and power circuits. This omission causes PANEL RECOMMENDATION: Accept. confusion and misunderstandlngabout the requirements for the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative; installatlon of LV switchgear for this purpose. The proposed addition of 384-X and reference to LV switchgear in the other sectlons of Article 384 will clarify these requirements. PANEL RECOMMENDATION: Reject. Article 384: Reject CMP 9 PANEL COMMENT: The panel feels the scope covers switchgear. SUBMITTER: J.J. Kark, National Electrical Manufacturers Assn. VOTE ON PANEL RECOMMENDATION: ~66 ReviseArticle 384 to also specify LV switchgear AFFIRMATIVE: 11. ~nclosed low-voltage power circuit breaker switchgear). NEGATIVE: Burniston. Revise Article Title: SWITCHBOARDS, PANELBOARDS, AND LV COMMENT ON VOTE: SWITCHGEAR. ECKARDT: TO ellmninate the confusion a sentence could be Revise 384-1: added, to Section 384-I namely "Where switchboards are mentioned

171 /

171 low voltage switchgear is also included." isolated from busbars by a metal barrier." • EXPLANATION OF VOTE: VOTE ON PANEL RECO~ENDATION: BURNISTON: NEMAbelieves that the Panel's conclusion is AFFIRMATIVE: g. incorrect since LV switchgear is a specific product not already NEGATIVE: Hogan, Lelman, Wadhwa. covered by theproducts defined as switchboards or panelboards. EXPLANATION OF VOTE: HOr~N: Same as Proposal No. 68. LEIMAN: Same as Proposal No. 68. WADHWA: Same as Proposal No. 68. 384-3(a): Reject CMP 9 SUBMITTER: G. G. Biskupek, Federal Pacific Electric Co. ~67 To the last sentence, add the words, "in order to prevent accidental contact with any conductor which remains 384-3(c): Reject CMP g energized after the main devices in a service switchboard are SUBMITTER: Robert W. Gilmore, Northwest Iowa Technical College turned off." 70 Add a second paragraph as follows: SUBSTANTIATION: Need for clarification is demonstrated by Field provisions shall be provided for the installation of an questions: isolate to prevent fault commutation, isolate to equipment grounding terminal bar approved for the purpose, and prevent access, etc.? if used as service equipment, an equipment grounding terminal PANEL RECOMMENDATION: Reject. bar approved for the purpose shall be provided and secured PANEL COMMENT: The Code does not and cannot provide an inside of cabinet or panelboard for the attachment of all the explanation or a reason for each requirement. It would be feeder and branch-circuit equipment grounding conductors, where foolhardy to start now. the panelboar~ is used with nonmetallic raceway or cable, or VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. where separate equipment grounding conductors are provided. The terminal bar shall be bonded to the cabinet or panelboard frame and shall not be connected to the neutral bar In other than service equipment. 384-3(a): Accept CMP g SUBSTANTIATION: Most electricians and inspectors do not realize SUBMITTER: Charles J. Hart, National Electrical Contractors that when a panelboard approved for the purpose is used for service equipment, is still a panelboard. Most inspectors and PROPOSAL: 68 Deletethe second sentence of Section 384-3(a) electricians recognize the need for terminating the equipment ~IATION: Compliance with this requirement is next to grounds on a separate bar when used in a panelboard on the load impossible. In multi-section switchboard installations, it is slde of the service equipment, but don't see the need when a often unknown to the installer in what section a particular panelboard is being used a service equipment. overcurrent device is located. NOTE: The intent of this Is not to require the manufacturer Moreover, decisions to relocate circuit entrances Into the to provide an equipment terminal bar with each panelboard but to switchboard section are often made in the field, particularly provide the provlsidns for one; some disconnect switches when there are obstructions or conflicts with other equipment. approved for use as service equipment do not have these This requirementnecessitates.extenslve switchboard modification provisions and cause a real problem for the electrician or in these instances. inspector. When thls equipment is used with an equipment Most switchboards have large open spaces without barriers grounding conductor, there is no place to terminate properly, between adjacent sections. Fires can communicate between forcing one ~o violate the NEC. sections even if there are no conductors common to adjacent PANEL RECOMMENDATION: Reject. sections. The interconnectlons between switchboards are often PANEL COMMENT: The present wording adequately reflects the made with insulated conductors capable of transmitting fire to Panel's intent. the adjacent section. This requirement does not add a VOTE ON PANEL RECO~MENDATION: Unanimously Affirmative. responsible degree of safety for these conditions. PANEL RECOMMENDATION: Accept as Revised: Revise .as in Proposal No. 69. VOTE ON PANEL RECOI~4ENDATION: 384-3(f): Reject CMP 9 AFFIRMATIVE: g. SUBHITTER: A.G. Aschenbeck, Wayzata, MN NEGATIVE: Hogan, Leiman, Wadhwa. ~71 Revise,as follows: EXPLANATION OF VOTE: ~e arrangement on three phase buses shall be A,B,C frem HOGAN: Once again we have indicated on t'his proposal that we front to back, top to bottom, or left to right, as viewed from are accepting what the proponent has desired. It is my op~nlon the front of the switchboard or panelboard. The C phase shall that we have flatly rejected the proposal and then formed one of be that phase having the higher voltage to ground. Other busbar o~r own. In any event I am voting negatively. Quite possibly, arrangements shall be permitted for additions to existing if we had utilized the word raceway or something similar to that installations and shall be marked. . in lieu of the word barrier, I would have a different opinion SUBSTANTIATION: There is too much confusion between the Hi-leg about the proposal we have formulated. I am completely, opposed being assigned to the "B" phase (center) as Is presently done to the original proposal. and the meter industry requirement of the Hi-leg on the right LEIMAN: The New York City code has had this requirement for side of their facilities. The "B u phase location serves no the last 12 years without causing any problems to any purpose other than locating the Hi-leg in the center. installer. The Panel Recommendation wlll cause switchboards to PANEL RECOMMENDATION: Reject. be loaded wlth metal barriers. This will lead to hazardous PANEL COI4a4ENT: The Panel does not agree with the supporting conditions. Since the 1978 Code became effective, I have never comment. No evidence to support the suggested change. received any negative comments from the field or at any of the VOTE ON PANEL RECOMMENDATION: IAEI meetings. AFFIRMATIVE: 11. WADHWA: I agree'with the concept of the proposal, but the NEGATIVE: Cock. substantiation offered is not correct. The shop drawings EXPLANATION OF VOTE: generally are submitted by the manufacturers for approval of the COCK: Section 384-3(f) should be clarified for 3-wlre delta switchboard and approved by the Engineer' before the SWBD is systems by adding the words: "on 3-phase, 4-wlre delta systems" fabricated. The installer should be familiar with the location after the word "ground,~ in the second sentence. The second and arrangement of protective devices. sentence will then read: "The B phase shall be that phase having the higher voltage to ground on 3-phase, 4-wire delta systems. ~ This action will clarify the system" addressed in this

• 384-3(a}(HOD 1978 NEC): Accept CMP 9 requirement. A 3-phase, 3-wire corner (B-phase) grounded system SUBMITTER: NEMA cannot meet a requirement that B-phase be the highest voltage to PROPOSAL: 69 Delete the second sentence of this Section. ground. ~:I]I~"FAlg'rIATION: Cempliance with this requirement is next to impossible. In multi-section switchboard installations, it is often unknown to the installer in what section a particular oyercurrent device is located. 384-3(h)-(New): Accept CMP 9 Moreover, decisions to relocate circuit entrances into the Secretary's Note: It was the action of the Correlating switchboard section are ~ften made in the field, particularly Committeethat this Proposal be reported as a "reject," because when there are obstructions or conflicts with other equipment. less than two-thirds of the members eligible to vote have not voted This requirement necessitates extensive switchboard modification in the affirmative. in these instances. SUBMITTER: Robert J. Freund, Chicago, IL Most switchboards have large open spaces without barriers P]TOPO-S'TTL-~. 72 Add new (h) as follows: between adjacent sections. Fires can c.emmunicate between ~ll busbars in equipment that operates at voltages over sections even if there are no conductors common to adjacent 250 volts between phases or between any phase and ground and sections. The interconnectlons between switchboards are often designed to carry currents of 1000 amperes or greater shall be made with insulated conductors capable of transmitting fire to insulated. The insulation shall be solid, mechanically secure, the adjacent section. This requirement does not add a and suitable for the operating voltage. responsible degree of safety for these conditions. SUBSTANTIATION: Busbars that are not insulated are a hazard to PANEL RECOMMENDATION: Accept as Revised: personnel who install and maintain electrical equipment. Add an exception as follows: 384-3(a). Exception: Busbars that are not insulated increase the likelihood of "Conductors shall be permitted to travel horizontally through power interruptions of vital electrical systems that affect the Ivertlcal sections of swltchboards where such conductors are public safety. 172 Ground fault protection only covers certain limited faults and designs, in general, would not be modifiable to incorporate bus increases the possibility of interruptions. insulation; consequently, major redesign programs would need to Insulated busbars provide personnel safety and continuity of be initiated by the various equipment manufacturers. All NEMA, service at a low cost. ANSI and UL standards would need to be revised. It is estimated PANEL RECOMMENDATION: Accept as Revised: that a five to ten year timetable would be involved. Atte~)tlng "All busbars in solidly grounded ws,e switchboards that operate to incorporate insulated bus systems on existing designs will at voltages over 250 volts to ground but not exceeding 600 volts involve design modifications and de-rat(ng factors and result in phase to phase and rated 1000 an~oeres or greater shall be equipment designs which would not be in compliance with NEMA, insulated except at bolted Joints and connections. M ANSI and UL standards. VOTE ON PANEL RECOMMENDATION: In conclusion, experience in the field does not warrant or AFFIRMATIVE: 7. Justify the need for insulated busbars in metal-enclosed, NEGATIVE: Hogan, Burniston, Cock, Cramer, LaMorte. low-voltage electrical equipment. In fact, this requirement COMMENT ON VOTE: would not only increase costs substantially but would reduce BARKER: I have voted affirmative as the Panel Recemmendation reliability and complicate maintenance. It is expected that is better than nothing. In time it will again require another fire and smoke damage would increase as a result of, Insulatlon change to comply with the original proposal. Insulated busbars burning associated with bus faults. Ionized gases resulting would greatly reduce the magnitude and resulting hazards of from insulation burning would tend to propagate the fault arc, burndowns from arcing faults when failures occur. causing major equipment damage and power interrup~lons. LEIMAN: I haven't voted negatively on this proposal but would Plant safety records and maintenance experience do not like to be on record to discuss this at our next meeting in indicate that unlnsulated buses in enclosed equipment are a Dece~foer. It will give us more of an input when I attend our hazard to maintenance personnel. One of the problems with IAEI Sectional meetings. insulated buses, for example, in high-voltnge equipment is that EXPLANATION OF VOTE: it becomesdifficult to tie grounds to these buses for safety HOGAN: I have voted negatively on this proposal for two during maintenance. This would also apply to low-voltage reasons: (I) to call as much attentlon,to the proposal as is equipment that was completely insulated. possible and (2) to give the Panel another opportunity to discuss the Proposal. I am not satisfied that we have actually accomplished what we intended~ BURNISTON: This proposal imposes a design requirement on 384-3(h)-(New): Reject CMP g equipment presently covered by A~erican National Standards and SUBMITTER: Donald C. Smith, Texas Chapter IAEI Underwriters Laboratories Inc. standards which deliberately do ~73 Add (h) as follows: not include this requirement. .---T~T)--A-ny multi-section service switchboard incorporating This type of equipment is not intended to be installed or multiple main overcurrent devices feeding subsections within the maintained while energized. same switchboard shall indicate by use of permanent mimic bus on Incomplete insulation as specified in this proposal will lead the face of the switchboard the bussing schematic of that to a false sense of security on the part of personnel and will switchboard. encourage the unsafe practice of working on energized equipment. SUBSTANTIATION: For many years design engineers have recognized Addition of insulation to busbars in this equipment will lead the need for mimic bus on the front of switchboards for the to voltage stress concentrations on the insulation and result in safety of personnel and ease of identification. In modern failure of the insulation which maY cause equipment failure design of switchboards installed on large industrial type instead of preventing it. installations, mimic bus is being utilized more and more. Some These products as presently built, have not experienced of the reasons for using the mimic bus are: When viewing the history of power interruptions and personnel safety hazard bus assembly from the rear of the switchboard, line and load sufficient to justify this requirement. busses often are not easily distinguishable. Also, often time COCK: If busbars are to be insulated within this voltage the rear of the switchboard is not accessible thereby making it range there should be an exception in Section 230-95 which would hard to determine which main device feeds which group of not require ground fault protection of equipment for insulated sub-devicos. Some switchboards with insulated buses make it busbars. hard to identify line and load connections. Lack of The Panel has recognized that bolted joints and connections identification presents an obvious hazard to workmen. cannot be insulated. I submit that the condition of "insulated PANEL RECOMMENDATION: Reject; busbars" and "uninsulated Joints and connections" tends to give PANEL COMMENT: Supporting comment is not persuasive as to the workman a false sense of security since he tends to assume necessity. he is working on an "insulated system." VOTE ON PANEL RECOMMENDATION: CRAMER: I disagree with the supporting comment that busbars AFFIRMATIVE: 11. that are not insulated are a hazard to personnel who install and NEGATIVE: Leiman. maintain electrical equipment. Good safety practices can EXPLANATION OF VOTE: accomplish much more than any form of insulation. LEIMAN: I agree with the supporting comment. Bare busbars are allowable even when located outside of enclosures provided they are suitably guarded. (See Section 110-17(a).) Here in a switchboard which already meets requirements of Section 110-17(a), we're requiring additional 384-6-(New): Accept CMP 9 guarding in the form of insulation. This is not necessary. Secretary's Note: It was the action of the Correlating Furthermore, there's no real substantiating data to indicate Committee that the Panel shall delete reference to new and that this will significantly add to safety. The only certain existing installations. The application of installation rules thing it will do is increase costs. is the function of the authority enforcing the Code. LA MORTE: Submltter alleges that unlnsulated busbars are a SUBMITTER: Samuel S. Levinrad, VA, Wash., DC hazard to personnel who instal] and maintaln.electrical PITOITO-S'AI_-~.• 74 Renumberexisting Sections and add new 384-6 as equipment. If personnel safety is the issue, this requirement would accomplish nothing, in that busbar Joints and cable 384-6. Water Pipes and Accessories. Any pipe or duct system, connections would still be exposed; and these are the areas foreign to the electrical installation, shall not be located in where problems and failures requiring attention occur. Also the vicinity of switchboards and service equipment, nor enter or good safety practice dictates that you do not rely on electrical pass through rooms specifically designed to house this type of insulation; consequently, when working on electrical equipment, equipment. No piping or air conditioning duct system, other treat it as if bare. Such reliance can lead to carelessness and than those systems which serve the electrica~ equipment space, a false sense of security. shall be located in the vicinity of any switchgear or service It is a widely known fact that covering a bus with a thin equipment nor shall they pass through rooms or architectural coating does not make it safe to touch. See NFPA No. 70-B, page space specifically provided for the housing of such equipment. 48 - "Electrical Equipment Maintenance," quoted following: SUBSTANTIATION: Sections 450-47 and 710-9 are the only areas "Although the bus and connections are insulated in metal clad within NEC prohibiting foreign piping (water pipes) in areas switchgear, THE INSULATION IS NOT DESIGNED TO PROTECT AGAINST containing electrical equipment. With the advent of the large ELECIRICAL SHOCK. CONTACTWITH THIS BUS OR ITS CONNECTIONS office and apartment house complexes, it has become more SHOULD BE AVOIDED WHEN THE SWITCHGEAR IS ENERGIZED." (The economical to purchase primary voltage power, feed through the capit'als are as in the NFPA No. 70-B text.) switchgear, stepdown to utilization voltage and distribute Submitter alleges that busbars that are not insulated increase throughout the complex. We have seen hospitals and building the likelihood of power interruptions of vital electrical complexes wherein chilled water pipes, steam pipes, cold water systems that affect the public safety. No evidence has been pipes, sanitary cleanouts and other piping pass directly over submitted to substantiate this claim - merely hearsay. In fact, the building's secondary or primary switchgear. In addition, if low-voltage buses were required to be insulated, some a~chitects still utilize the electrical closets as a chase manufacturers would begin to reduce or eliminate phase:to-phase for other than electrical conduit. The addition of a paragraph and phase-to-ground air clearances and depend solely on such as recommended will aid the inspection authority having insulation barriers. It is expected that bus failures due to Jurisdiction in performing its function and assure a safer insulation breakdown would increase, resulting in more power installation. interruptions. PANEL RECOMMENDATION: Accept as Revised: Submitter a11eges that implementation of this proposal can be Change 384-1 to "General." Change the "Scope" to paragraph accomplished at low cost. This statement is not backed up with (a) and "384-2. Other Articles" to paragraph (b). Number the any cost analysis; consequently, it is unfounded. It is following 384-2: expected that the cost of switchgear and power distribution 384-2 Installation. equipment would increase dramatically. Existing switchgear (a) New Buildings. In every new building hereinafter 173 designed, constructed or erected, an electrical service, delete the word "fireproof" and replace with the words distribution, transformation or control equipment shall be "flre-resistant." located in rooms or spaces dedicated exclusively to such SUBSTANTIATION: In its present form, because of the word equipment. No foreign piping, ducts or other mechanical or "fireproof" for which there appears to be no standard or architectural equipment or appurtenances shall be permitted to definition, the section has little value either to the building be installed in, enter or pass through such spaces or rooms. designer or to the constructor. (b) Existing Buildings. Previously approved electrical If in fact, the intent is to establish a specific level of installations shall be permitted to remain. fire resistant integrity, then the proposal could be expanded to (c) Existing Buildings Being Remodeled. An existing building include 1 hour, 2 hour, 3 hour, which is being remodeled more than 50 percent or in which a new etc., based on, as example, ASTM-E119, etc. electrl~al service and distribution system is being installed PANEL RECOMMENDATION: Reject. shall conform to the provisions of paragraph (a) of this section. PANEL COMMENT: We do not intend to establish fire-reslstant Exception No. 1: Control equipment which by its very nature ratings for ceiHngs above switchboards. or because of other rules of this Code must be adjacent to or VOTE ON PANEL RECO~MENDATION: Unanimously Affirmative. within sight off its operating machinery. Exception No. 2: Ventilating, heating or cooling equipment that serves the electrical rooms or spaces. Exception No. 3: Transformers,, controllers, switches and 384-9 (HOD 1978 NEC): Accept CMP 9 distribution equipment located throughout industrial plants SUBMITTER: C~ g which are isolated from foreign equipment by height or physical ili~-O'FO-~-~.76 ReviseSection 384-9 so as to read as follows: enclosures which will afford adequate mechanical protection from ~onductor Covering. All insulated conductors used inside vehicular traffic, accidental contact by unauthorized personnel of switchboards shall be flame retardant and shall be rated not or accidental spillage or leakage from piping systems. less than 600 volts. Exception No. 4: Outdoor electrical equipment located in SUBSTANTIATION: The panel feels that it is unnecessary to weatherproof enclosures protected from accidental contact by continue to add every new wire type that is brought on the unauthorized personnel or vehicular traffic or accidental market. The simple sentence above is all that is necessary to spillage or leakage from piping systems. assure,that the proper wire will be used in switchboards. VOTE ON PANEL RECOMMENDATION: PANEL RECOMMENDATION: Accept as Revised: AFFIRMATIVE:. 9. Change 384-9 to read: "Conductor Insulation. An insulated NEGATIVE: Biermann, Cremer, LaMorte. conductor used within a switchboard shall be listed, flame COMMENT ON VOTE: retardant and shall be rated not less than the voltage applied ECKARDT: While the concept can be supported terms such as to it and not less than the voltage applied to other conductors "Every new building" and "Existing buildings" would seem to or busbars with which it may come in contact. include residences. I do not believe this is the Panel's intent. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. , COCK: An "Exception No. 5" should be added for one and two family dwellings. DEMING: I am in agreement with'the proposal) but believe we have exceeded our authority in Section 384-2(b) making the rule 384-9: Accept CMP 9 that previously approved electrical installations shall be SUBMITTER: TSC-Approved for the Purpose permitted to remain. The Judgement of whether or not previously I~TOl~)~)~.• 77 See the Technical Subcommittee "Recommendations" approved electrical installations are currently safe should be un--n-d'e'~--t-Fe definition of "Approved for the Purpose" in Article left to the inspection authority having Jurisdiction. 100. In Section 384-2(c) we should insert the word "structurally" SUBSTANTIATION: See the TSC °findings" under the definition of before the word remodeled, which appears In the title and first "Approved for the Purpose" In Article 100. sentence. The word "structurally" clarifies our intent with PANEL RECOI~ENDATION: Accept as Revised: regard to the type of remodeling. As Proposal No. 76. EXPLANATION OF VOTE: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. BIERMANN: The precept of a double standard of rules for existing buildings and new buildings is a bad code. Moreover, retroactive rules are worse. The declaration that previously approved electrical installations shall be permitted toremain 384-15: Reject C~ 9 would clearly disfranchise the application of the code rules no SUBMITTER: Mike Brendle, Mt. Vernon, WA - matter how hazardous the condition. 78 Add the following paragraph after the present CRAMER: When this ~unen&nent to this proposal was originally text: considered, it appeared desirable. Later reflection on it has "Not more than 90 percent of the total spaces in any lighting uncovered some deficiencies. and appliance branch-circuit panelboard in a one-family chwelling (I) Interpretation of what constitutes a space can vary from shall be occupied after initial installation." person to person. Some industry users place switchgear or motor SUBSTANTIATION: The building and electrical construction control centers in one portion of a machinery room. Somemight industry, being very competitive, often causes electrical consider this a violation because of machinery and piping in the installation to meet only the minimum NEC requlren~nts. The same room with electrical; others might not consider this a owner of a new one-family dwelling often encounters a panelboard vlolatlon because of the electrical gear in its own space. that has no available space for overcurrent devices. The only Similarly in a home, the mount of space required for a service course of action for the electrician is to install tandem entrance panelboard is vague. circuit breakers. These are approved for this application, but (2) Industrial control rooms with operator attended control they increase current density and heating within the panels would fall under this section. Desks, file cabinets, panelboard. It is the intent of this amendment to provide a drinking fountains and other accessory items are included In one-family dwelling with an electrical service which will these roo~s and would be In violation of the proposal. accomodate the diverse electrical needs of the future. (3) The exceptions themselves appear incorrectly located PANEL RECOMMENDATION: Reject. afterafter paragraphParagraph l~I~ They appear to be more logically located PANEL COMMENT: Proposal is primarily a design consideration. VOTE ON PANEL RECOI&M[NDATION: Unanimously Affirmative. LaMDRTE: At a glance it appeared that this proposal, with some modifications, would be a good one. The revised proposal taking it part by part was a disappointment, and I have voted negative for the following reasons: 384-16(a): Reject CMP 9 I. There seems to be a lack of definition to "Spaces or SUBMITTER: Ralelgh W. Rheuby, Jr., Hueytown, AL Rooms." Is space, working space as defined in Article 1107 Are ~79 Add the words "one and" after the words "on the rooms totally enclosed or merely a screened area? su~-'u'~'Ty-side by." 2. Section 450-47 on Transformers does not consider piping Revise Exception No. 2 as follows: for fire protection foreign to the electrical installation. Exception No. 2: Individual protection for lighting and Would the proposed Section 384-2 permit sprinkler piping for a appliance branch-circuit panel boards Is not required where such unit substation line-up consisting of primary switches, panelboards are used as service equipment in supplying service transformer and low voltage section? to signs, pumps and equipment separate from buildings of 3. In Part (c) who could determine if a building is being occupancy. remodeled more than 50 percent? If a building Is required to be SUBSTANTIATION: Since the words from the 1975 NEC Section remodeled greater than 50 percent, one way of getting around the 384-16(a), Exception No. 2 - and .where any bus supplying 15- or NEC would be to complete the installation In several different 20-an~)eres circuits is protected on the supply side by an phases. overcurrent service, have been deleted from the 1978 NEC Section 4. The objection I have about the 4 exceptions is that it 384-16(a), Exception No. 2. The Code does not require a main expands beyond the scope of the Article which should be on disconnect or overcurrent service for service equipment of Switchboards and Panelboards. residential housing. This constitutes a conflict and confusion between Section 384-16(a), Exception No. 2 and Section 230-79(a) through (d) besides the need for the protection of equipment and safety of persons. 384-7: Reject CMP g This proposal and any improvements are for con~ideratloo to SUBMITTER:" H. K. Glenn, Pacific Coast Electrlcal Assn. 75 In 384-7, delete the word "nonfireproof" and ~with the words "nonfire-reslstant." In Exception No. 1,

174 ' cause the Code to require a main disconnect current protection Typical Transformer I sec. for residential occupancy panel and to be in accord with Section Ratings (kVA) 230-79(a) through (d). 15 PANEL RECO~MENDATION: Reject. 30 83.4 PANEL COMMENT: See Panel•actlon on Proposal No. 80. 45 125.0 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Panelboard Main PanelboardMain Bus (amps) Circuit Breaker (amps) IUU IUU

384-16(a), Exception No. 2: Accept CMP 9 i00 . i00 SUBMII-TER: Idaho Chapter IAEI 225 225 IM~roI~FO-S'-A~-T.'80 Delete 384-16(a), Exception No. 2. 3u~I~NItATION: This is a subject that has come up in every The overcurrent protection of a 15 kVA unit substation with a Code for a number of years and has been rejected or blocked full load current of 41.7 amperes, 15 ampere branch-circuit every time. It is not quite clear as to the reason why except breaker, and 100 amp standard panelboard bus, is not enhanced that the supporting comment of the "con" nature seems to with the standard 100 amp transformer secondary main breaker reiterate the thought that no one has been electrocuted, rated at over twice full load (calibrated to trip in 6 minutes injured, or there are not any fire records showing contributory at 200 amperes--UL489). factors to this exception. It seems that some pressures are A branch-circuit fault close to the panelboard is seen by the applied in areas beyond the Code Making Panels' jurisdiction instantaneous elements in both the main and the corresponding because Proposal No. 83 in the Preprint for the 1978 Code was branch-circuit breaker. This can drop all the substation load submitted ~d accepted by Code Making Panel 9. possibly creating an unsafe condition due to a con~lete loss of This seems to be indicating that politics has a greater power to critical process instruments or to the area lighting bearing on Code making than the desire for having compatible being served. Code especially when the negative pressures come from the The identification and marking of each branch circuit is segments of the industry not regulated by the NEC requirements. already a requirement of NEC 110;22 and assists in monitoring In other words, why is a residential service permitted to have the load connected to each phase. equipment that is not only less restrictive than the other I believe that the restrictions of this proposal exceed those occupancies but can be mere easily tampered with by allowed under 384-16(a) Exception No. 2 for a safe installation. inexperienced persons Just because they feel they can do as they PANEL RECOMMENDATION: Reject. please w!th what they own even though it may endanger their next PANEL COMMENT: Present requirement is necessary. door neighbor. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Proposal No. 83 page 204 of the 1978 NEC Preprint is evidence that it is prime time that this exception be retired from the NEC. PANEL RECOMMENDATION: Accept as Revised: 384-17-(New): Accept CMP 9 I Add to Exception No. 2 at beginning of sentence: "For existing Secretary's Note: It was the action of the Correlating installations,." Committee that the Panel shall delete reference to new and VOTE ON PANEL RECOMMENDATION:, existing installations. The application of installation rules AFFIRMATIVE: 11. is the function of the authority enforcing the Code. NEGATIVE: Biermann. SUBMITTER: Samuel S. Levinrad, VA, Wash., DC EXPLANATION OF VOTE: ]~TO]~TS'A-L-~." 83 Renumberexisting Sections and add new 384-17 as BIERMANN: I am in favor of ~he proposal. I am not in favor of establishing one standard for existing dwellings and another 384-17. Water pipes and accessories. No piping or duct for new dwellings. ~ system foreign to the electrical installation, shall be located in the vicinity of panelboards and service equipment, or pass through rooms specifically designed to house this type of equipment. No piping or air conditioning duct system, other 384-16(c): Reject CMP g than those systems which serve the electrical equipment space, SUBMITTER: O. E. Dillon, Border County Div. IAEI shall be located in the vicinity of any switchgear, panelboards ~81 Revise as follows: or service equipment and shall not pass through rooms or ~he total load of appliances or equipment fastened in architectural space specifically provided for the housing of place and connected to any overcurrent device located in a such equipment. panelboard shall not exceed 80 percent of the overcurrent device SUBSTANTIATION: Sections 450-47 and 710*g are the only areas rating where in normal operation and load will continue for within the NEC prohibiting foreign piping (water pipes) in areas three hours or mere. containing electrical equipment. With the advent of the large "SUBSTANTIATION: This section is practicably unenforceable office and apartment house complexes, it has become mere unless the jurisdiction has the man power to make periodic economical to purchase primary voltage power, feed through the checks of all occupancies (commercial and residential) to switchgear, stepdowo to utilization voltage and distribute determine if the portable appliances are overloading any throughout the complex. We have seen hospitals, office overcurrent devices. See the attached opinion* of the San Diego buildings and apartment houses wherein chilled water pipes, City Attorney. steam pipes, cold water pipes, sanitary cleanouts, pass directly *See Border County Div. IAEI substantiation for proposal for over the building's secondary or primary switchgear. In ' llO-16(a). addition, some architects still utilize the electrical closets PANEL RECOMMENDATION: Reject. as a chase for other than electrical conduit. The addition of a PANEL COMMENT: Present requirement is necessary. paragraph such as recommended will aid the inspection authority VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. having jurisdiction in •performing its function and assure a safer installation. PANEL RECOMMENDATION: Accept as Revised. I ~ee Panel action on Proposal No. 74. 384-16(d), Exception No.' 2-(New): Reject CMP 9 VOTE ON PANEL RECOMMENDATION: SUBMI1-FER: D. H. Mclntosh, E. I. du Pont de Nemours & Co. AFFIRMATIVE: 10. I~TOlbI~S';~-T.'82 Add exceptionas follows: NEGATIVE: Biermann, LaMorte. ~ion No. 2: Individual protection for lighting and COMMENT ON VOTE: appliance branch-circuit panelboards is not required in . ECKARDT: See my comment under Proposal No. 74. industrial establishments where conditions of maintenance and COCK: An "Exception No. 5" should be added for one and two supervision indicate that only qualified persons will service family dwellings. the installation; the transformer primary (supply) is protected EXPLANATION OF VOTE: by overcurrent protection in accordance with Section • BIERMANNi See my comments on Proposal No. 74. 450-3(b)(1); and, the conductors tapped to the transf6rmer LaMORTE: See comments on Proposal No. 74. secondary meet all of the following conditions: (1) the length ' of the tap conductors does not exceed 10 feet; (2) the ampacity of the tap conductors is not less than the ampacity of the panelboard; (3) the tap conductors are enclosed in a raceway 384-18: Accept ' CMP 9 approved for the purpose. SUBMITTER: TSC-Approved for the Purpose SUBSTANTIATION: The following table of unitized 84 See the Technical Subcommittee "Recommendations" transformer-panelboards illustrates the application of 3 typical un--6-de~--t'~e definition of "Approved for the Purpose" in Article sizes of 480-208/120-volt transformers supplying lighting and 100. appliance branch-circuit panelboards. A transformer secondary SUBSTANTIATION: See the TSC "findings" under the definition of main circuit breaker requires an unjustified increased cost for "Approved for the Purpose" in Article 100. the electrical installation without a commensurate increase in PANEL RECOMMENDATION: Accept as Revised: safety. I ~hange the word "approved" to "designed." VOTE ON PANEL RECOMMENDATION: "'AFFIRMATIVE: 9. NEGATIVE: Hogan, Barker, Cramer.

175 t EXPLANATION OF VOTE: NOTE: The intent of this is not to require the manufacturer to HOGAN: I don't find the word "designed" any more palatable provide an equipment terminal bar with each panelboard but to than the word "identified" in this section of the Code. I would provide the provisions for one; some disconnect switches much prefer the word, "listed." At least we have a definition approved for use as service equipment do not have these in the code book for it. The word "designed" really doesn't tie provisions and cause a real .problem for the electrician or this down to anything. inspector. When using equipment without these provisions and an BARKER: The use of the word "designed" would result in equipment grounding conductor or conductors are present there is confusion and lack of uniformity. These enclosures should be no place to terminate them properly, forcing one to violate the listed. NEC. CRAMER: See comments on Proposal No. 74. PANEL RECOMMENDATION: Reject. HANbL COMMENT: We do not agree with the supporting comment and do not believe that the Proposal accomplishes what the submitter intended. 384-21: Reject CMP 9 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: J.A. Fehr, General Electric Co lsITOlsO-S'Al--~.• 85 Revise as follows: i ~Busbars. B~sbars may be copper or aluminum. If rigidly mounted, they may be bare. 384-27, Exception No. 2-(New): 'Accept CMP 9 SUBSTANTIATION: Section 110-5 states "Conductors normally used SUBMITTER: RobertB. West, St. Louis, MO to carry current shall be of copper unless otherwise provided in P]TOIsO-S'A'L-~88 Add a new exception as follows: this Code." ~ion No. 2: The terminal bar for equipment grounding Since no such provision is contained in Article 384, this conductors shall be permitted to be connected to the neutral.bar could be interpreted to mean all conductors in switchboards and at separate buildings in accordance with the provisions of panelboards must be copper. For manyyears the industry has Section 250-24, Exception No. 2. manufactured these products with aluminum conductors and in SUBSTANTIATION: This is to correct a conflict. Where the large volume. The proposed change will bring this Arbicle into grounded circuit conductor is grounded at a separate building in accordance with the intent of the proposed change to Section accordance with Section 250-24, the terminal bar for equipment 110~5 in the 1978.NEC (Proposal No. 76). grounding conductors must be bonded to the neutral bar in order PANEL RECOMMENDATION: Reject. to complete the ground-Sault current path to the service. PANEL COMMENT: Such practice is not prohibited by present Code. • The reference to Section 250-24, Exception No. 2 correlates VOTE ON PANEL RECOMMENDATION: with my proposal to amend Section 250-24. If Section 250-24 is AFFIRMATIVE: 10. not amended, the reference in this proposal should be Section NEGATIVE: Cramer, Doming. 250-24(a). EXPLANATION OF VOTE: PANEL RECOMMENDATION: Accept as'Revised: CRAMER: I believe the submitter is correct. To avoid I Delete the words "Exception No. 2" at the end of sentence. misunderstanding we should add statement, "Busbars may be copper VOTE ON PANEL RECOMMENDATION: or aluminum" as a fine print note. AFFIRMATIVE: 11. DEMING: I agree with the submitter. All he is asking for is NEGATIVE: Barker. additional clarity. EXPLANATION OF VOTE: BARKER: In accord with Articles 230 and 250, when the conductors enter the second building they are service conductors to that building except for the exceptions. To add this to this 384-21: Accept ~ CMP 9 section would be confusing and could result in improperly SUBMITTER: CMP 9 grounded installation with resultant hazards. We should leave ~85A Revise384-21 to read: "Busbars shall be services and grounding to the appropriate Panel, with only a ~mounted." cross-reference in this Section. SUBSTANTIATION: See Proposal No., 72. FANEL RECOMMENDATION: Accept as Revised: "Insulated or bare busbars shall be rigidly mounted." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 384-XX-(New): Accept CMP 9 Secretary's Note: It was the action of the Correlating Committee that the Panel shall delete reference to new and existing installations. The application of installation rules Table 384-26: Accept CMP 9 is the function of the authority enforcing the Code. SUBMITTER: TSC-Nominal Voltage SUBMITTER: Southwestern Section IAEI l~TOIsl~S'Al--~.'86 The voltage designation' in Column i should be ~89 Add section as follows: ~to read: 3ITATX]~Z-. Electrical switchboards, electrical controls or control Not over 127 volts; panels other than those related to the Mechanical Code shall not Not over 254 volts; be located in any machinery room. Not over 635 volts; SUBSTANTIATION: The following problems have arisen due to the SUBSTANTIATION: To conform to the method to express maximum electrical requirements included in other uniform codes. Too voltage as per guidelines developed by the TSC on nominal often this requirement can be overlooked from the standpoint of voltage. design and plan check, therefore, creating a situation that can PANEL RECOMMENDATION:' Accept as Revised: result in enormous cost in order to satisfy all model code Add the word "nominal" after "125 volts, .... 250 volts," and requirements after the installation has been made. I feel that "600 volts" in Table 384-26. the electrical requirements included in other codes should be VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. cross-referenced back to this Code. The 1976 edition of the Uniform Mechanical Code will allow the following equipment in a machinery room: (1) Lights and receptacles 384-27: Reject CMP 9 (2) Machinery room exhaust fans and blowers SUBMITTER: Robert W. Gilmore, Northwest Iowa Technical College (3) Any refrigerating condensing unit or portion ~87 Revise as follows: thereof ~oard cabinets or panelboard when used as service (4) Circulating pumps for condensers, cooling equipment shall be grounded in'the manner specified in Article towers, or cooling coils 250 or Section 384-3(c). An equipment grounding terminal bar (5) Air compressors serving only automatic controls approved for the purpose shall be provided and secured inside of within the refrigerating or cooling system cabinet or panelboard for the attachment of all the feeder and (6) Electrically operated valves for the control of branch-circuit equipment grounding conductors, where the a refrigerant or for the control of the panelboard is used with nonmetallic raceway or cable, or where circulation of a cooling fluid separate equipment grounding conductors are provided. The (7) Blowers and fans for cooling towers or for terminal bar shall be bonded to the cabinet or panelboard frame condensers and shall not be connected to the neutral bar in other than , (8) Any electric control or control panel for any of service equipment. the above items. SUBSTANTIATION: Most electricians and inspectors do not realize A readily accessible single emergency refrigeration control that when a panelboard' approved for the purpose is used for switch shall be provided to shut off all electrically operated service equipment It is still a panelboard. Most inspectors and machinery in any machinery room, except the exhaust ventilation electricians recognize the need for terminating the equipment system complying with UMC Section 1508. Such switch shall be grounds .on a separate bar when used in a panelboard on the load controlled from a point outside of, and within ten feet of the side of the service equipment, but don't see the need when a required opening to the machinery room it serves, and the switch panelboard is being used as service equipment. shall be )abeled to comply with UMC Section 1519. Except as Adding the words "when' used as service equipment" should help modified by this article, wiring and equipment shall comply with to enforce the meaning of the article. the applicable requirements of Chapter I through 4. Also, there is a need for the change from "approved" to PANEL RECOMMENDATION: Accept as Revised: "approved for the purpose" otherwise an inspector can approve I See Panel actlon on Proposal No. 74. any type of fitting for-equipment ground termination other than VOTE ON PANEL RECOMMENDATION: the equipment grounding terminal bar provided by the AFFIRMATIVE: 9. manufacturer. NEGATIVE: Biermann, Cramer, LaMorte. 176 COMMENT ON VOTE: ~UCK: An "Exception No. 5" should be added for one and two family dwellings. EXPLANATION OF VOTE: BIERMANN: See my comments on Proposal No. 74. CRAMER: See comments on Proposal No. 74'. LaMORTE: See comment for Proposal No. 74.

384-XX-(New): Accept CMP 9 Secretary's Note: It was the action of the Correlating Committee that the Panel shall delete reference to new and existing installations. The application of installation rules is the function of the authority enforcing the Code. SUBMITTER: GeorgeAlexander, Fresno, CA ~90 Electrical switchboards, electrical controls or controTpanels other than those related to the Mechanical Code shall not be located in any machinery room. SUBSTANTIATION: The.following. problems have arisen due to the electrical requirements included in other uniform codes. Too often this requirement can be overlooked from the standpoint of design and plan check, therefore, creating a situation that can result in' enormous cost in order to satisfy all model code 'requirements after the installation has been made. I feel that the electrical requirements included in other codes should be cross-referenced back to this Code. The 1976 edition of the Uniform Mechanical Code will allow the following equipment in a machinery room: I) Lights and receptacles 2) Machinery room exhaust fans and blowers 3) Any refrigerating condensing.unit or'portion thereof 4) Circulating pumps for condensers, cooling towers, or cooling coils 5) Air compressors serving only automatic controls within the refrigerating or cooling system. 6) Electrically operated valves for the control of a refrigerant or for the control of the circulation of a cooling fluid 7) Blowers and fans for cooling towers or for condensers 8) Any electric control or control panel for any of the above items A readily accessible single L;mergency refrigeration control switch shall be provided to shut off all electrically operated machinery in any machinery room, except the exhaust ventilation system complying with UMC Section 1508. Such switch shall be controlled from a point outside of, and within ten .feet of, the required opening to the machinery room it serves, and the switch shall be labeled to 'comply with UMC Section 1519.- Except as modified by this article, wiring and equipment shall comply with the applicable requirements of Chapter I through 4. PANEL RECOMMENDATION: ACcept as Revised: i See Panel action on Proposal No. 74. "VOTE ON PANEL RECOMMENDATION: PJ-PIRMAIIVE: 9. NEGATIVE: Biermann, Cramer, LaMorte. COMMENT ON VOTE: COCK: An "Exception No. 5" should be added for one and two family dwellings. EXPLANATION OF.VOTE: : ee my comments on Proposal No. 74. CRAMER: See comments on Proposal No. 74. LaMORTE: See comment for Proposal No. 74."

177 be permitted to be used at the ampacities shown in the tables of Table 400-4: Accept CMP 6 this article with any of the equipment or devices specified in SUBMITTER: William H. Korcz, Shell Development Co./Shell Articles 210, 220, 230, 240, 250, 380, 384, 410, 430, 440, 517. C'li;~-~-F~3T-Co. This section shall become effective January 1( 1985. I PROPOSAL: 65 Add the following new designation type letters to SUBSTANTIATION: Problem: Terminal restrictions imposed upon l'~Bl-~-~I;{IO-4 in the appropriate service cord (SP, SV, SJ, S; SDR) conductors do not recognize improved insulation technology. sections as shown in table and include a new Note 10 as follows: These restrictions cause under-utillzatlon of conductors and SUBSTANTIATION: The current NEC designation syste~ for service raceway systems. This under-utillzation causes excess costs for type flexlble cords (Article 400) does not provide for a broad both material and labor, wasting both natural resources and group of acceptable cord insulations and outer coverings based energy. upon thermoplastic rubber materials. What we propose is a PANEL RECOMMENDATION: Accept. revision to Table 400-4 as shown in the "Recommended Text" VOTE ON PANEL RECOMMENDATION: section which will provide the necessary differentiation of this AI-~IRMAIIVt: 6. group from currentqy designated "rubber" and "thermoplastic" NEGATIVE: Coffey, Conley, Durham, Hogan, Jannot. insulation and outer covering classes of materials. EXPLANATION OF VOTE: The substantiation for thls proposal has two aspects: COFFEY: T oppose the panel rec~mendation to accept this (I) performance and fabrication considerations, and proposal because the ampacity and operating temperature are (2) the expressed need by cable producers and adequately covered in Sections 310-15 and 310-9 respectively of users to develop this new type designation for thermoplastic the 1978 NEC. This proposal does nothing to alleviate the rubber materials. problom described in the substantiation for the proposal, Detailing of arguments arising from these viewpoints is found namely, that restrictions on the terminal presently control the in the accompanying appendices* to this proposalS: load current through the insulated wire. The intent of the Appendix 1: Sgmmary proposal is good but It should appear in'the appropriate Appendix 2: Introduction, general background, sections of the Code, that cover the use of wire and cable acceptance and performance, history, terminations. \ terminology and definitions associated CONLEY: The Panel Comment on Proposal No. 54 is that with thermoplastic rubbers terminations do not determine conductor ampacitles. Neither Appendix 3: Performanceconsiderations based upon should conductor ampacities dictate the ratings of terminals on UL fact finding programs and UL No. 62 connected equipment. It is desirable that all readily available listings conductors, equipment and devices be thermally compatible - that Appendix 4: New type designation survey of cable appears to be the intent of the proposal. See also my Co~ent manufacturers and users. on Proposal No. I. *Appendices have been supplied to CMP members. DURHAM: This proposal is in conflict with 410-11 and 110-11 PANEL RECOMMENDATION: Accept as Revised: in that it would permit conductors to be used in equipment with I Deletehyphens (1 places) in type letters preceeding "E" in higher temperatures than that for which the conductor is rated. proposed additions to Table. Delete proposed Note 10 and all HOGAN: I find it, impossible to understand how CMP 6 can make references to Note lO. the statement made in your Panel Co¢mnent on Proposal No. 54 and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. then to accept the substantiating comments made by the proposer of the proposal. The Correlating Committee had better decide if CMP 6 has the responsibility of telling how and where the conductors for which they are responsible may be used regardless Table 400-4: Accept - CMP 6 of the provisions of all the other sections mentioned in this SUBMITTER: Peter Pol)ak, The Aluminum Association proposal. We may find that there are some panels that might not ~66 Insert "copper" in the second tabular heading like to be told that information. J under "Size AWG." JANNOT: The panel should assign a section number. SUBSTANTIATION This proposal is submitted to clarify the proper conductor tot the application. Makes clearer the fact that the conductor is to be copper. The panel is referred to the proposed revision in Section 110-5. ARTICLE 400 -- FLEXIBLE CORDS AND CABLES PANEL RECOMMENDATION: Accept as Revised: I Aoa "copper" to the third tablular column. Table 400-4: Reject CMP 6 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: R. Droste, National Elevator Industry, Inc. IqII~OS'AL-~63 Change the range of wire sizes for Hard Service ~m 18-2 to 20-2 AWG. SUBSTANTIATION: More extensive use of electronics with Table 400-4, Note No. 6: Accept CMP 6 corresponding lower required currents permits use of smaller SUBMITTER: R. Drgste, National Elevator Industry, Inc. wire. FROPO~AC'~" 67 Reyisethe first paragraph as follows: Such a change was already made in 1978 Code on elevator ~or traveling cables for operating control and signal cables, pages 236 and 237. circuits shall contain non-meta11~c fillers as necessary to PANEL RECOMMENDATION: Reject. maintain concentricity. Centrally located steel supporting PANEL COMMENT: Supporting comment is not persuasive as to members are supplied as needed for suspension methods described necessity. in Section 620-41. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: The information on "Note 6" does not comply wlth the statements of 620-41 which permits three methods of traveling cable support. The present.Note 6 states that a traveling cable shall have Table 400-4: Reject CMP 6 non-metallic fillers or a steel supporting filler. The SUBMITTER: August Lukaslewicz, Cornish Wire Products non-metallic fillers are used by manufacturers with and without ~64, In the "Type Letter" column add SVR for vacuum steel support. The standard steel is not a supporting filler. cea--T'6-an'~-cords; add SJR for junior hard service cord; and, add SR Fillers are used to round out (equalize) the conductor layup. for hard service cord. In the "Insulatlon" and "Outer Covering" PANEL RECOMMENDATION: Accept as Revised. columns for vacuum cleaner cord, junior hard service cord, and First sentence of proposal is to replace existing first hard service cord add the words "Thermoplastic Elastomer." sentence of Note 6. Second sentence of Proposal is. rejected. SUBSTANTIATION: Electrical wires insulated and jacketed with Also, delete the word "fillers" and replace with "members" in thermoplastic elastomers require a new class designation for the the existing second and third sentences of Note 6. Revised following reasons: first paragraph of Note 6 to read as follows: I. Chemistry: The chemical structure and characteristics of 6. Elevator traveling cables for operating control and signal thermoplastic elastomers differ significantly as compared to circuits shall contain nonmetallic fillers as necessary to other thermoplastic materials. Thermoplastic elastomers are maintain concentricity. Cables exceeding 100 feet between chemically cross-linked yet remain thermoplastic. Thermoplastic supports shall have steel supporting members except in locations elastomers represent a new class of block copolymers designed subject to excessive moisture or corrosive vapors or gases. for wire and cable applications offering properties not Where steel supporting members are used, they shall run straight previously available in a single polymer. through the center of the cable assembly and shall not be cosied 2. Performance: The performance of thermoplastic elastomers with the copper strands of any conductor. is generally superior to other thermoplastic materials, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specifically in low and high temperature performance, abrasion resistance and in electrical performance. Thermoplastic elastomers are almost equivalent to rubber compounds in performance characteristics. Table 400-4, Note No. 6: Accept CMP 6 3. Aesthetics: Unlike other thermoplastic materials, SUBMITTER: R. Droste, National Elevator IndUstry, Inc. thermoplastic elastomers have the feel and appearance of PROPOSAL: 68 Deletethe first three lines of the second rubber. Thermoplastic elastomers can easily be mistaken for and substitute the following: rubber, therefore, a separate class designation is in order. "Type E, EO, EN, ET, ETP, ETLB, and ETT elevator cables shall PANEL RECOMMENDATION: Reject. be permitted to contain No. 20 to No. 14 gage insulated PANEL COMMENT: See Panel action on Proposal No. 65, Table 400-4. conductors. In addition, they may have incorporated in the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. construction No. 20" ..., etc. SUBSTANTIATION: ~rticle 620-12(a)-(2) permits No. 20 gage conductors for operating control and signal circuits. The 107 subject article restricts this use to a shielded pair. 400-5: Reject CMP 6 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: Greg Batie, Seattle, WA I Delete "gage" and replace with "AWG." Add "AWG" after "No. 20" 72 400-5. Ampacity of Flexible Cords and Cables. in the second sentence. l'~BT~-~O-5 gives the allowable ampacity for not more than 3 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. current-carrylng conductors in a cord. If the number of current-carrying conductors in a cord is from 4 to 6, the allowable ampacity of each conductor shall be reduced to 80 percent of the values for not more than 3 current-carrying Table 400-4, Note No. 7: Reject CMP 6 conductors in the table (except in theaters and similar SUBMITTER: R. Droste, National Elevator Industry, Inc. locations). A conductor used for equipment grounding and a I~ITO!~T~TTL-~. 69 Omit present wording of Note 7 and substitute the neutral conductor which carries only the unbalanced current from folIowlng: other conductors. "A separate conductor In these cables shall be available for SUBSTANTIATION: In stage lighting systems there are usually grounding purposes only." more than 3 current-carrying conductors in multi-conductor cords SUBSTANTIATION: This note refers to "a third conductor in these between the grid terminal boxes and the lighting receptacles. (elevator) cables is for grounding purposes only." An elevator The number of circuits are required to give the lighting cable has a multitude of conductors. A "third conductor" has no designer additional Flexibility in circuiting the lighting meaning. fixtures, not because of greater loading. PANEL RECOMMENDATION: Reject. It does not make sense to require circuit derating in a stage PANEL COMMENT: Note 7 is not applicable to elevator cables in lighting system, due to the fact that there is a large diversity Table 400-4. factor in the number of fully loaded circuits at any time. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. There is also a minimal probabllity:that enough circuits will be loaded long enough to cause an elevated temperature in the cord. In most theatre projects the precedence has been not to derate the stage circuit conductors, in accordance~with Article 400-5. Tables 400-4 and 400-5: Accept CMP 6 PANEL RECOMMENDATION: Reject. SUBMITTER: Austin D. Wetherell, Underwriters Laboratories Inc. PANEL COMMENT: The present wording adequately reflects the ~70 Substitute the word "thermoset" for the word Panel's intent. ih Notes 6, 8 (line 4 only), and 9 to Table 400-4; VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Table 400-4 in its entirety; and Table 400-5 column headings. Table 400-4, outer covering on Types SVO, SJO and SO, change "oil resistant compound" to "oil resistant thermoset." Add new types to Table 400-4 as follows: 400-5: Accept CMP 6 SUBMITTER: R. Droste, National Elevator Industry, Inc, Trade Name T~pe Letter Insulation Comments 73 Changethe second sentence to the following: Vacuum Cleaner SV00 Oil Resistant All number of current carrying conductors in a. cord exceeds Cord Thermoset. other 3, the maximum allowable load current of each conductor shall columns be reduced as shown in the following table: identical Number of Conductors Percent of Values in Table 400-5 to SVO 4 through 6 -" 80 SVTO0 Oil Resistant All 7 through 24 70 Thermoplastic other 25 through 42 60 or Thermoset columns 43 and above 50 identical to SVTO In addition to the above, Table 400-5 should be revised to Junior Hard SJO0 Oil Resistant All recognize size No. 20 wire. Service Cord Thermoset other SUBSTANTIATION: ManyFlexible Cords and/or cables are listed in columns Tables 400-4 as having 2 or more conductors. The ampacity identical rating described in Table 400-5 does not recognize cords/cables to SO0 or more than 3 conductors. SJTO0 Oil Resistant All PANEL RECOM~IENDATION: Accept as Revised. Thermoplastic other The CMP accepts the revision to change the second sentence and or Thermoset columns add the table as submitted. identical In addition, revise Table 400-5 to include No, 20 AWG to SJTO conductors and a triple asterisk note as follows: Hard Service SOD Oll Resistant All AWG At B+ Cord ' Thermoset "other 20 B*** 7*** columns identical *** Elevator cables only. to SO VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. STO0 Oil Resistant All Thermoplastic" other or Thermoset columns identical 400-5: Reject, CMP 6 to STO Secretary's Note: It was the action of the Correlating Committee that action regarding the second paragraph of Section SUBSTANTIATION: 1. Based on test work and discussion with 400-5 will have to be correlated with proposals for Section users, manufacturers, and inspection authorities, UL has 250-60. declined to List "Rubber" cords employing elastometric (rubber) SUBMITTER:" Raymond Koster, Sheldon, IA compounds which were not thermoset. Consequently, there are IqTOI~OS'A~-~.• 74 Amendthe second paragraph as follows: proposals to revise the 1978 NEC to recognize new types ~a single conductor is used for both equipment 9r6und employing "thermoplastic elastomers." The above revisions are •and" to carry unbalanced current from other conductors, as necessary in order to clearly differentiate the three types. provided for in Section 250-60 for electric clothes dryers and 2. To make intent clearer. electric ranges, it "shall" be considered as a current carrying 3. UL has Listed these new types to give recognition to cords conductor. with oil resistant insulations as well as Jackets. SUBSTANTIATION: A grounded conductor in my opinion should be PANEL RECOMMENDATION: Accept. considered as a current carrying conductor in the article. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Simply because it does carry a current. It carries the unbalanced current from the other conductors. It is essential in the starting and running of electric ranges and electric clothes dryers. It usually doesn't carry as much current as the 400-5: Accept CMP 6 phase conductors, but it does carry a certain amount of current. SUBMITTER: Peter Pollak, The Aluminum Association Referring to the Notes to Tables 310-16 through 310-19. Note !BIT(~B-O~L-~. 71 In the first sentence insert "copper" following lOB states that in a 3-wlre circuit consisting of 2-phase wires l~-carrying .... " and a neutral of a 4-wire 3-phase system. The common (grounded) SUBSTANTIATION Thls proposal is submitted to clarify the proper conductor carries approximately the same current as the other conductor for the application. Makes clearer the fact that the conductors and shall be counted in determining ampaclties. ~conductor is to be copper. The panel is referred to the Because of this, it is my suggestion that the wording in proposed revision in Section 110-5. Article 400-5 be changed from 'shall not' to 'shall be PANEL RECOMMENDATION: Accept. considered a current carrying conductor.' For the simple reason VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. it does carry a current. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Supporting co(mnent is not persuasive as to necesslty. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative.

108

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Table 400-5: Reject CMP 6 revisions in Article 410, I am of the opinion that they describe SUBMIT~ER: Peter Pollak, The Aluminum Association satisfactory applications for flexible cord. l~TOl~O'S'~-~.• 75 Add the following note to Table 400-5: SEGALL: I am voting to approve the proposal. Panel 21 who ~ The above ampacities are for copper conductors." has the Jurisdiction for Article 410, has voted to affirm the SUBSTANTIATION This proposal is submitted to clarify the proper proposals to Panel 21 in a revised form. Thls new form will conductor for the application. Makes clearer the fact that the recognize the use of cord and plug connections under a system of conductor is to be copper. The panel is referred to the proper Identification by a recognized testing agency such as UL. proposed revision in Section 110-5. Again I wish to emphasize that all of the manufacturers of PANEL RECOMMENDATION: Reject. this equipment are getting wide acceptance of these open space : ee anel action on Proposal No. 71, Section office systems and they are being installed and widely accepted 400-5. throughout the United States and Canada. Because of this VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. acceptance and demand I feel that there should be some control through the NEC for the electrical components of the system. Panel 6 will have to have some form of correlatin with Panel 21 and'for thls reason I feet that CMP 6 should reverse itself Table 400-5: Reject CMP 6 on this Proposal and vote for the adoption of the proposal as SUBMITTER: R. Oroste, National Elevator Industry, Inc. written with the correction as to the Section references to 76 This table should be in line with Tables 310-16 conincide with the new numbers proposed by CMP 21. ~6--3~!X~CT9 to show different ampacity ratings for conductors with 0 rubber covered insulation cempared to thermoplastic insulation. The table should also provide ampacity rating for size No. 20 AWG wire. 400-7(a)(3) and (6) (HOD 1978 NEC): Reject CMP 6 SUBSTANTIATION: Section 340-7 states that ampacities of a Type SUBMITTER: Technical Subcommittee on Definitions of Stationary TC tray cable (multiple conductors) should be determined from X~6TT~s Table 400-5, etc. PROPOSAL: 78 Delete Section 400-7(a)(3) and revise (6) to , In Table 400-5 the rubber insulated conductors (temp. rating rea--e-a-dT~m,connection of appliances to facilitate their frequent 60°C) have the same ampacity rating as thermoplastic conductors interchange." (temperature rating gO°C). SUBSTANTIATION: The Technical Subcommittee found that some Table 400-5 does not cover size No. 20 AWG conductor. Table requirements for fixed appliances, portable appliances, and 400-4 does. stationary appliances were based on different meanings of the PANEL RECOMMENDATION: Reject. terms. These differences arise from the intent of the authors PANEL COMMENT: The Panel does not agree with the supporting of the requirements at the time the text is adopted. In some ~ent. cases the requirements are based on the means of electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. connection of the appliance to the supply circuit. In other instances the requirements involve the physical location of the appliance. The TSC noted some requirements that appeared to involve both meanings and still others where It was not clear 400-7(a)and(b): Reject CMP 6 from the wording what the concerned Code Making Panel intended. SUBMITTER: Stephen D. Channer, Business and Institutional The Technical Subcommittee suggests that the requirements ~Manufacturer's Assn., BIFMA 'pertaining to appliances differentiate between those that are PROPOSAL: 77 Add the following to (a): necessitated by vlrtue of the method of the electrical .~0) connection of office furnishings, appliances and connection and those that relate to the physical location of the lighting as permitted by Sections 410-100, 410-101, and 410-102." appliance. With regards to the electrical connections, it is" Revise (b) as follows: suggested that this be accomplished either by the use of a cord Delete "and" after (a)(6) and add "and (a)(10)" after (a)(8). and plug or by a permanent connection, that is, without the use SUBSTANTIATION: This proposal concerns itself with wiring of a cord and plug. Requirements pertinent to appliance systems as provided by members of our industry with office location involve physically fastening the appliance in place by furniture systems that are now being used extensively in offices means other than the e~ectrical connection or locating the throughput the United States. Although not exclusively, office appliance in dedicated space. These appliances may be moveable furniture systems are primarily used in areas referred to as within the space. The result of either approach is to place the "open plan" or "landscape" office layouts. appliance on a specific circuit. Within our industry, office ,systems furniture has grown in The Technical Subcommittee believes that if these delineations popularity to a great extent over the past several years. Much were scrupulously observed and universally applied throughout of the popularity stems from the advantages of portablity and the Code, both in the drafting of new requirements pertaining to ease of rearrangement. Today the sales of this type of appliances and revising current appliance requirements, the furniture are well over 300 million dollars annually and confusion surrounding the interpretation and application of the growing. Due to energy conservation requirements, users have three terms under review would disappear. Moreover the TSC demanded the inclusion of task and ambient lighting with this believes that adherence to this understanding would obviate the type of furniture. Current industry estimates show that need for the three terms. approximately 80 percent of all office furniture systems sold As an aid to clarifying the intent of the requirements, the, contain electrical power. When such power is provided by TSC suggests that as required, the following terms or phrases be manufacturers within our association, safety is foremost in employed: permanently connected; cord- and plug-connected; their consideration and all wiring systems have.been or are in fastened in place; or located to be on a specific circuit. the process of being submitted to and listed by Underwriters There are requirements where in the opinion of the TSC the Laboratories or other nationally recognized testing laboratories. deletion of terms "fixed", "portable", or "stationary" will in Our industry is very proud of its concern for product safety no way affect the requirements. In such cases, it is and performance and the good record that it currently enjoys. unnecessary to substitute any of the foregoing. Our purpose in submitting the enclosed proposal to the National PANEL RECOMMENDATION: Reject. Fire Protection 'Association is to establish a category within PANEL COMMENT: The present wording adequately reflects the the National Electrical Code that deals specifically with Panel's Intent. products made within our industry that contain wiring systems VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. and to provide in "writing the standard of quality that must be adhered to by those making such systems. Your review and favorable consideration of this proposal will be very much appreciated by the business and institutional 400-7(c)-(New): Reject CMP 6 furniture industry. ( SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. PANEL RECOMMENDATION: Reject. PlTOI~[-~.- 79 Add new (c) as follows: PANEL COMMENT: CMP feels proposal is not in consistence with ---(-c~lexible cord connections may be made directly to the 5ectlon 400-8. load end terminals of busway plug-in devices,, providing such VOTE ON PANEL RECOMMENDATION: connections include a suitable tension take-up device on the AFFIR~t~IIVE: 9. cord to satisfy the requirements of Section 400-10. NEGATIVE: Coffey, Segall. SUBSTANTIATION: The phrasing of paragraph 400-7(b) presumes EXPLANATION OF VOTE: that a flexible cord with attachment plug will be plugged into a COFFEY: I oppose the panels recommendation to reject this conveniently located receptacle outlet at a convenient fixed proposal because I do no agree with the Panel Comment that the location. In actual practice, appliances may have to be moved proposal is inconsistent with Secton 400-8. Section 400-8 talks from place to place in locations where the only available power about not using flexible cords as a substitute for fixed wiring, supply might be from a run of plug-in busway. running in through walls, ceilings or floors, doorways, windows For this application, strict interpretation of 400-7(b) or similar openings, attached to building surfaces or where requires the introduction of a costly but unnecessary concealed behind building walls. A review of the proposed intermediate connection between the flexible cord and the Section 410-100, 410-101 and 410-102 under consideration by Code plug-in device. Panel 21 indicates the use of flexible cord would be limited to 1. Cord-to-busway connections are permitted per Section 364-8 office furnishings, appliances and lighting which are free but no guidelines are included for the make-up of such standing. In addition, the panels involved are also limited in connections. height to approximately 7 feet and in no instance do they run 2. Proposed 400-7(c) satisfies the intent of 400-7(b); the from floor to ceiling and where more than one panel is involved, busway plug-in device serves as the attachment plug--and the they are mechanically connected and not' Joined together by Just busway plug-in opening serves as the receptacle outlet. a length of flexible cord. After reviewing the proposed 3. Proposed 400-7(c) eliminates the unnecessary intermediate l 109 connection in the sequence: flexible cord--to attachment 400 Part C: Reject CMP B plug--to receptacle outlet--to load terminals of busway plug-in SUBMITTER: TSC-Nominal Voltage device - to plug-in jaws--to bus bars of busway. 83 Deletethe word "nominal" from heading. PANEL RECOMMENDATION: Reject.' ~'I]I~'FA]qTIATION: Change recommended for clarification and to PANEL COM~iENT: Material is adequately covered in Section 364-8. obtain conformance with present practice and uniformity within ~l)InL'-OIl-l~Al~'~ RECOM~IENDATION: the Code. AhFIRMATIVE: 8. PANEL RECOMMENDATION: Reject. NEGATIVE: Conley, Oannot, Lipsey. PANEL COMMENT: The present wording adequately reflects the EXPLANATION OF VOTE: Panel's intent. CONLEY: The proposal should be revised by changing "May VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. to "shall be permitted to" in the first line. Thls is a safe and suitable means of making connections to busway plug-in devices as explained in the substantiation, but it is not adequately covered in Section 364-8 as the Panel 400-31(a): Reject CMP 6 Comment claims. SUBMITTER: Peter Pollak, The Aluminum Association JANNOT: I disagree with the Panel Comment that the materi~1 84 In the first sentence following "No~ 8" insert is adequately covered in Section 364-8. The submitter has ~or No. 6 aluminum.... stated that the NEC now requires the complex arrangement SUBSTANTIATION This proposal is submitted to clarify the proper detailed in item 3 of his Substantiation. The consensus of the slze equivalent of aluminum conductor for the application. The Panel was that this is not required and that cords can be -- and size limitation is based upon an ampacity requirement which can are now -- connected directly to the plug-in devices. be met with an aluminum conductor sized to provide the required Obviously, then, the NEC as it is now written is subject to ampacity. The panel is referred to the proposed revision in

misinterpretation and, in my opinion, accepting this proposal Section 110-5. ., would clarify this point. PANEL RECOMMENDATION: Reject. LINSEY: I do not agree with the Panel Comment that this : ee Panel action on Proposal No. 84A, Section mate~al is properly covered by Section 364-8. The submitter, 400-31(a). NEMA, states that the present Code requires the arrangement VOTE ON PANEL RECOHMENDATION: Unanimously Affirmative. outlined in paragraph 3 of his Substantiation. The Panel felt that this is not required and that cords can and are now being connected directly to the'plug-ln devices. It appears that the Code, as now wHtten is being misunderstood. The acceptance of 400-31(a): Accept CMP 6 the proposal would clarify this. SUBMITTER: CMP 6 84A Revise as follows: --'X'~T-C-Bnductors. The conductors shall be No. 8 AWG copper or 400-9: Reject CMP 6 larger and sha!l employ flexible stranding. SUBMITTER: IdahoChapter, IAEI SUBSTANTIATION: To clarify the proper conductor type for the ~80 In Section 400-9 the third line down change the application. wor--o-f-d~-"ITard-service" to "hard-usage." PANEL RECOMMENDATION: Accept. SUBSTANTIATION: This will make the wording here in 400-9 VOTE ON PANEL RECOMMENDATION: Unaniinously Affirmative. compatible wTth the wording in the Table 400-4. There will be no question of the type flexible cords that are permitted to be repaired after initial installation. PANEL RECOI~MENDATION: Reject. • ARTICLE402 -- FIXTURE WIRES PANEL COMMENT: The present wording adequately reflects the Panel's Intent. The intent of Section 400-9 is to permit the 402-1: Accept CMP 6 splicing of hard-service cord only, such as Types S, SO, ST, and Secretary's Note: It was the action of the Correlating STO. C~m~nittee that the Panel review this Proposal for possible VOTE ON PANEL RECOMMENDATION: conflict withTable 402-3 which mentions other kinds of A~FIRMATIVE: 10. conductors, o NEGATIVE: Hogan. SUBMITTER: Peter Poliak,'The Aluminum Association EXPLANATION OF VOTE: PIIOIIIIS'XL-T.• 85 Changethe sentence to read as follows: This HOGAN: I would change my vote on the proposal if the words ~covers general requirements and construction "hard service flexible cords" were revised to read as fol}ows: specifications for copper fixture wires." "flexible hard service cords." This would then pin down SUBSTANTIATION This proposal is submitted to clarify the proper precisely what the panel says is intended and .would also answer slze equivalent of aluminum conductor for the application. the proposer's aim. Makes clearer the fact that the conductor is to be copper. The panel is referred to the proposed revision In Section 110-5. PANEL RECOMMENDATION: Accept. vuIE DN PANEL RECOMMENDATION: . 400-I0: Accept CMP 6 AFFIRMATIVE: g. SUBMITTER: R. S. Pinkerton, Los Angeles, CA NEGATIVE: Coffey, Hogan. )ITOP1~']~-~.. 81 Add a sentence as follows: EXPLANATION OF VOTE: -'-l~TexT~le cords shall, where passing through holes in outlet COFFEY: I oppose the Panel Recemmendation to accept this boxes, covers or similar enclosures, be protected by approved proposal because I feel the introduction of the limitation bushings or fittings especially designed for the purpose. copper fixture wires in the scope of this Article is not SUBSTANTIATION: Flexible cords or cables should be protected correct. This Article covers the installation of a11 fixture from sharp ~ges where they pass through holes in sheet metal wires and.while at present,, fixture wires are limited to copper covers or boxes. UL standards require a bushing or protection conductors, this limitation is rightfully stated in Section where passing through a sheet metal hole and this same 110-5 of the Code and if the panel feels further clarification protection should be given to field installed cords. is necessary, it could appear in another Section of Article 402, PANEL RECOMMENDATION: Accept as Revised: such as 402-5 or 402-6. Add a new section as follows: HOGAN: The heading for this Article is Fixture Wires. It 400-14. Protection From Damage. Flexible cords and cables would seem to me that anyone using this book would take from shall be protected by bushings or fittings where passing through that heading that any restrictions or provisions for fixture holes in covers, outlet boxes or similar enclosures, wires would be found in this Article. By accepting this VOTE ON PANEL RECO~IENDATION: Unanimously Affirmative. proposal you have limited the Scope of this Article to copper fixture wires and have left the door open for any one to manufacture fixture wires of any material and there wlll be no regulations covering them. The Scope of this Article is not AOO-lO:ReJect CMP Just copper fixtures wires; it is all fixture wires now and SUBMITTER: Southwestern Section IAEI forever. PRuPOSAL: 82 Add the following sentence to Section 400-10: Flexlble cords shall, where passing through holes in outlet boxes, covers or similar enclosures, be protected by approved bushings or fittings especially designed for the purpose. 402-3:Accept CMP 6 SUBSTANTIATION: Flexible cords or cables should be protected SUBMITTER: TSC-Nominal Voltage fromsharp e~ges where they pass through holes in sheet metal ~86 Revisesecond sentence as follows: covers or boxes. UL standards require a bushing or protection ~xture wires listed In Table 402-3 are all suitable for where passing through a sheet metal hole and this same service at 600 volts, nominal or less unless otherwise specified. protection should be given to field installed cords. SUBSTANTIATION: Change recommended for clarification and to PANEL RECOMMENDATION: Reject. obtain conformance with present practice and uniformity within PANEL ~Ui~MENT: See Panel action on Proposal No. Bl, Section the code. 400-10. PANEL" RECO)eiENDATION: ACcept as Revised: VOTE ON PANEL RECOte~ENOATION: Unanimously Affirmative. I "Delete the words "or less." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

110 connection in the sequence: flexible cord--to attachment 400 Part C: Reject CMP B plug--to receptacle outlet--to load terminals of busway plug-in SUBMITTER: TSC-Nominal Voltage device - to plug-in jaws--to bus bars of busway. 83 Deletethe word "nominal" from heading. PANEL RECOMMENDATION: Reject.' ~'I]I~'FA]qTIATION: Change recommended for clarification and to PANEL COM~iENT: Material is adequately covered in Section 364-8. obtain conformance with present practice and uniformity within ~l)InL'-OIl-l~Al~'~ RECOM~IENDATION: the Code. AhFIRMATIVE: 8. PANEL RECOMMENDATION: Reject. NEGATIVE: Conley, Oannot, Lipsey. PANEL COMMENT: The present wording adequately reflects the EXPLANATION OF VOTE: Panel's intent. CONLEY: The proposal should be revised by changing "May VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. to "shall be permitted to" in the first line. Thls is a safe and suitable means of making connections to busway plug-in devices as explained in the substantiation, but it is not adequately covered in Section 364-8 as the Panel 400-31(a): Reject CMP 6 Comment claims. SUBMITTER: Peter Pollak, The Aluminum Association JANNOT: I disagree with the Panel Comment that the materi~1 84 In the first sentence following "No~ 8" insert is adequately covered in Section 364-8. The submitter has ~or No. 6 aluminum.... stated that the NEC now requires the complex arrangement SUBSTANTIATION This proposal is submitted to clarify the proper detailed in item 3 of his Substantiation. The consensus of the slze equivalent of aluminum conductor for the application. The Panel was that this is not required and that cords can be -- and size limitation is based upon an ampacity requirement which can are now -- connected directly to the plug-in devices. be met with an aluminum conductor sized to provide the required Obviously, then, the NEC as it is now written is subject to ampacity. The panel is referred to the proposed revision in

110 Table 402-3: Accept CMP 6 Tin-coated Copper conductor for 150°C-600V service. SUBMITTER: John E. Conley, General Electric Co. c. HALAR insulated cable passes IEEE 383, "Standard for Type 87 Under Type Letter "AF," revise third column'as Test of Class IE Electric Cables...for Nuclear Power Stations" ~ when subjected to radiation aging and conditions designed to ImpreGnated 18-14 -- 30 simulate a loss of coolant accident (LOCA). Asbestos or .... 20 10 d. HALAR insulated cable is approved for "Fluoropolymer "SUBSTANTIATION: This proposal was accepted for inclusion in the insulation for use on Public Conveyance MR-73" for the Montreal 19/8 NEC but was Imbroperly:transcribed for printing; therefore Metro. The specification cal]s for oven aging for 96 hours at the printed version of the 1978 NEC does not correctly reflect 200°C among its tests. the action of the Cammittee. Refer: Proposal No. 4 page 213 of e. HALAR insulated cable manufactured by Revere Corporation 1978 Preprint NEPA 70PR78. of America passes a variety of tests required by IPCEA~19-81 and PANEL RECOMMENDATION: Accept. is qualified for insulation for nuclear power stations. VUlt UN PANEL R~COMMENDATION: Unanimously Affirmative. f. HALAR insulated cable, produced by BOFA, is recognized by CO~IENT ON VOTE: Sweden's SEMIKO standards for 155°C and 600V service. COFFEY: I suggest that when presenting this proposal in the g. HALAR insulated wire is recognized by Canadian Standard preprint for public comment, that the ent4~e third column of for App]iance Wire at 105°C and 150V for a 5 mil wal]. Table 402-3 for Type AF fixture wire be included. h. HALAR insulated wire Is recognized by the Electrical Trust of South Australia for 150°C 250V service and is therefore reciprocally recognized for use throughout Australia. In addition, the use of ECTFE as insulation for fixture wire Table 402-3: Accept CMP 6 will be substantiated by a Fact Finding Report by the SUBMITTER: Cutter D. Palmer, Wilmington, DE Underwriters Laboratories. The investigation is underway with a l}ITOl~--~." 88 For wire types KF-1 and KFF-1, revise preliminary report on the short term and 30 day aging expected X~FTcal~ions Provisions column to read: "Fixture wire, and as by December ist and the final report in ]ate January. permitted in Sections 725-16 and 760-16. Limited to 300 vo]ts." PANEL RECOMMENDATION: Reject. For wire types KF-2 and KFF-2, revise Applications Provisions PANEL COMMENT: See Pane] action on Proposal No. 89A, Table column to read: "Fixture wire, and as permitted in Sections 402-3. Accept CMP 6 Proposal 89A and refer to CMP 16. 725-16 and 760-16." VOTE ON PANEL RECOVJ~ENDATION: Unanimously Affirmative. SUBSTANTIATION: Multiple conductor type KFF-2 cable has been tested by Underwriters Laboratories in Northbrook, Illinois, in both the modified Steiner Tunnel Test and the IEEE-383 vertical tray test. In both tests full cable trays were subjects to the Table 402-3: Accept CMP 6 flme. Flame spread and smoke values were the lowest of any SUBMITTER: CMP 6 cables previously tested. Enclosed is a copy of a letter fr~ I I~T(~-O~-~.'89A Revise "Applications Provisions" column for UL with these test results. Also enclosed is a copy of the UL and HFF to read: "Fixture wiring, and as permitted in Fact Finding Investigation which was the basis for listing these Section 725-16." wire types in the 1978 NEC. SUBSTANTIATION: See Proposal No. 89. Hundreds of mil]ions of feet of wire with the KFF-2 insulation PANEL RECOMMENDATION: Accept contingent upon the concurrence of system have been used' for approximately 10 years in con~ercial 16. and military aircraft as well as the wiring for most space VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. vehicles and missiles. For instance, each Lockheed L-lOll has CO~ENF DN VUIL: approximately 650,000 feet of this wire installed as open, / HOGAN: Since Pane] 16 has rejected their proposal we should unjacketed bundles, both in the fuselage and in the SWAMP also indicate rejection of this proposal. (special wind and moisture problems) areas. The airlines report type KFF-2 wire to be essentially malntenance'free in spite of temperature extremes, high vibration, exposure to hydraulic, deicing, fuels, etc. It also meets the FAA proposed \ Table 402-3 (HOD 1978 NEC): Reject CMP 6 requirements for extremely low smoke generation. SUBMIITER: Cutter Palmer, E. I. duPont de Nemours & Co., Inc., PANEL RECOMMENDATION: Accept as Revised: ~TI-~F6~-6n, DE CMP 6 rejects first paragraph as Sections 725-16(b) and PROPOSAL: 90 Add fixture wife Types KF-1, KF-2, KFF-I, KFF-2 760-16(b) do not permit conductors limited to 300 volts. CMP 6 402-3. accepts second paragraph to revise "Applications Provisions" column for Types KF-2 and KFF-2. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Tape KF-1 Aromatic 18-10...5.5 None 200°C Fixture Wiring Insulated Polyimide 392°F Limited to Fixture Tape 300 Volts Table 402-3 (HOD 1978 NEC): Reject CMP 6 Wire SUBMITTER: Paul J. Koch, Allied Chemical Corporation, ~n, NJ Solid or KF-2 Aromatic 18-10...8.4 None 200°C Fixture Wiring PROPOSAL: 89 AmendSection 402--Table 402-3 to add: 7-Strand Polyimide 392°F and as per- Extruded 18-14--20 None 150°C Fixture Wire Tape mitted in 302°F and as per- : Section 725-16 mitted In Section 725-16 Tape , KFF-1 Aromatic 18-10...5.5 None 200°C Fixture Wiring Poly-ethylene ECTFE Poly- Insulated Polyimide 392°F Limited to chlorotrl- ethylene Fixture Tape 300 Volts fluoroethylene chlorotri- Wire Fixture Wire fluoro- Flexible ethylene Flexible KFF-2 Aromatic 18-I0...8.4 None 200°C Fixture Wiring Stranding Stranding Polyimide 392°F and as per- SUBSTANTIATION: HALAR ECTFE Fluoropolymer is a high temperature Tape mitted in resln exceptionally suited for electrical wire insulation. Its Section 725-16 dielectric strength in thin sections is as high as 2000 V/mil, volume resistivit% of 1015 ohm-cm, dielectric constant measures 2.5-2.6 over a wise temperature and frequency range, and SUBSTANTIATION: Kapton Tape insulated wire has been used for dissipation factor lower than most dielectrics, varying from several years in aircraft such as the LI011 and other military 0.0008 at 102 Hz to 0.13 at 106Hz. and government applications. Kapton's excellent electrical and In addition HALAR has high tensile strength on the order of mechanical properties, coupled with the ability to consistently 6-7000 psi, is moderately stiff and notched impact strength apply the tape uniformly and concentrically over the conductor, greater than 20 ft. ]bs. Its cut-through resistance and results in reduced insulation thicknesses not possible with abrasion resistance are excellent, which allows it to withstand conventional extruded insulations. considerable abuse during installation and service. HALAR PANEL RECOMMENDATION: Reject. insulation will not support combustion in air or in atmospheres PANEL COMMENT: See Panel action on Proposal No. 88, Table 402-3. up to 60 percent oxygen. It chars rather than melts or drips. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. It is inert to acids, bases, and strong oxidizing agents and does not dissolve or stress crack in any known solvent at temperatures up to 120°C.. HALAR insulation is capable of continuous service at 150°C and has a brittleness temperature 402-10: Reject CMP 6 less than -80°C. SUBMITTER: O. E. Dillon, Border County Div. IAEI In support of the above statement v~e offer the following items P'R'O-FO-S~A'C-~." 91 Add the word "only" after the word "permitted." for consideration: ~U~IANIIATION: This language is permissive and does not a. HALAR is recognized as a resin by Underwriters restrict the use of fixture wires. See the attached opinion* of Laboratories for continuous service at 150°C and for Appliance the San Diego City Attorney. Wiring Material, Style 1587, for service up to 125°C--no voltage *See Border County Div. IAEI substantiation for CMP I Proposal specified. No. 90 for 110-16(a). b. HALAR passes the Naval Air Systems Command Mil-W-22759/24 PANEL RECOf~MENDATION: Reject. (AS) for Wire, Electric, Fluoropolymer-insulated, Medium Weight, PANbL ~UMMhNI: Panel feels subject is adequately covered. vu}t UN PAflhL RECOMMENDATION: Unanimously Affirmative. 111 402-11 Exception: Accept CMP 6 SUBMITTER: W. R. Hitchens, E. I. du Pont de Nemours & Co. I~ITO]~-O~TAL-~. 92 Revise as follows: ~ion: As permitted by Section 725-16 for Class 1 circuits and Section 760-16 for fire protective signaling circuits. SUBSTANTIATION: Table 402-3 (right hand column) permits this for types of fixture wires covered in 760-16(b). In correlating changes to the 1978 NEC, I believe the reference to 760-16 in the Exception to 402-11 was left out in error. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

CHAPTER 9 -- TABLES AND EXAMPLES

Chapter 9, Tables 6, 7 and 8: Accept CMP 6 SUBMITTER: Alton R. Thompson, Durham, NC ~ROPOSAL: 93 Add to Tables 6, 7 and 8: "No. 8 stranded ~rs." SUBSTANTIATION: Since January 1973, No. 8 solid wire has been removed from the Nationa] Electrical Code book to be installed in conduit, except for Article 680. The properties of No. 8 stranded should be listed in Tables 6, 7 and 8. PANEL RECOMMENDATION: Accept as Revised. Table 6. Add "sol." after existing "8" and add No. 8 stranded din~nsions as follows: 8 str. .43 .145 .43x.75 .282 .86 .581

ReviSe Note as follows: Note - No. 14 to No. 10, solid conductors; No. 8, solid or stranded conductors; No. 6 and larger, stranded conductors.

Table 7. Add "sol." after existing "8" and add No. 8 stranded dimensions as follows: 8 str. .325 .083 .285 .064 .390 .119

Revise Note as follows: Note: No. 14 to No. 10, solid; No. 8, solid or. stranded; No. 6 and larger, stranded; except AVL where all. sizes are stranded.

Table 8. Add No. 8 stranded properties as follows: 8 16510 7 .0486 .1458 .0167 .653 .679 1.07

VOTE ON PANEL RECO~MENDATION: Unanimously Affirmative.

112 • REPORT OF CODE-MAKING PANEL NO. 21 410-X: Reject CMP 21 SUBMITTER: C. E. Muhleman, Marion IN , PROPOSAL: 3 Add new sections to Article 410 Part A as follows: ~current. Each fixture shall have overcurrent protection ARTICLE 410 -- LIGHTING FIXTURES,. LAMPHOLDERS, LAMPS built into the fixture or its cord cap.. The overcurrent device RECEPTACLES, AND ROSETTES shall not exceed 150 percent of the fixture load. 410-Overtemperature. Each recessed fixture shall have 410-Editorial (HOD 1978 NEC): Accept CMP 21 overtemperature protection built into the fixture. • SUBMITTER: A. KnicKrehm, Los Angeles, CA 410-Location. A permanent lighting fixture shall be installed ]~q~5-O'S'AL~.• I AmendArticle 410 as follows: in each room or space into which a person can enter. T1-~--2rro-65(a) Remove the words "constructed or." Exception: Residential living rooms. (2.) 410-65 Add new: SUBSTANTIATION: Proposed "Overcurrent" should prevent small (c) MaximumOperating Temperature. Fixtures shall be, so faults from not being detected by a large overcurrent device and installed thaU the maximum operating temperature of the thus will reduce fires.~ component parts of the fixtures will not be exceeded. Proposed "Overtemperature" should prevent fires from (3.) 410-36 Add new third sentence: overtemperatures such as may be caused from installing thermal Fixtures shall be so designed that the component parts of the insulation around the fixture. fixtures will not exceed their maximum operating temperature Proposed "Location" will eliminate some of t~e need for when the fixture is installed in compliance with this article. extension cords, etc., which have attributed to many (4.) 410-68 Add new second sentence: electrocutions. Fixtures shall be so constructed that-the maximum operating PANEL RECOMMENDATION: Reject. temperature of their component parts will not be exceeded. PANEL COMMENT: The supporting comment provided no evidence that SUBSTANTIATION: To insure that the maximum temperatures of small faults are resulting in fires and therefore the CMP fixture parts are not exceeded. Fixtures are sometimes boxed in rejects the proposed requiroment for overcurrent protection. In by fire resistant materials to comply with fire and building Proposal No. 42, CMP 21 has accepted a proposal addressing codes. This causes excessive temperatures to fixture parts, overtemperature. Section 210-26(a) already contains such as "P" rated lamp ballasts. When it is required to box-in requirements concerning "required lighting fixtures" and this fixtures suitable low heat equipment is available for fixture proposed addition to Article 410 is unnecessary. construction. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised. Accept the item (1.) portion of the proposal by deleting the words "constructed or" from Section 410-65(a). 410-4(a): Accept CMP 21 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PI~-OPO-S'AZ-~." 4 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" inArticle 100. Article 410: Accept CMP 21 SUBSTANTIATION: See the TSC "findings" under the definition of SUBMITTER: "CMP 21 "Approved for the Purpose" in Article 100. PROPOSAL: 1A Rev,iseArticle 410 as follows: PANEL RECOMMENDATION: Accept as Revised: 410-14. Make existing first sentence of first paragraph (a); I Delete the words "shall be approved for the purpose and." relocate balance of first paragraph; all of paragraph two and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. four to new 410-30(c); Relocate third paragraph to new 410-16(9). 410-23. Relocate text to (b) of 410-24. 410-4(a): Reject CMP 21 410-24. Change heading to "Conductors"; make existing text (a) SUBMITTER: CMP 21 with title "Insulation." Delete present (b)l ~4A In the third paragraph, after the word 410-26. Delete heading; relocate 410-26(a) to new 410-28(e) "basements a add "some bathrooms." with title "Stranding"; relocate 410-26(b) to new 410-28(f) with SUBSTANTIATION: CMP 21 considers that some bathrooms are damp title "Tension." locations, and that all bathrooms are damp locations at some 410-28. Relocate410-28(c) to new 410-30(a). Change title to times. "Lampholders." PANEL RECOMMENDATION: Reject. 410-29. Relocate 410-29(e) to 410-57(b) and change 410-57(b) to PANEL COMMENT: In re-evaluating this proposal, the CMP cannot (c); (c) to (d); (d) to (el. justify a damp location fixture to be required in all areas of a 410-30. Change heading to "Cord connected l ampholders and bathroom. fixtures." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Relocate 410-30(a) to new 410-16(b); Relocate 410-30(b) to new 410-28(c); Relocate 410-30(c) to new 410-28(d); 410-4(c)(1): Reject CMP 21 Relocate 410-30(d) to new 410-14(b); SUBMITTER: Jim Fleshman, Boise, ID Change 410-30(e)to (b). 5 Reviseas'follows: 410-32. Relocate to new 410-23. ~he fixture and hood shall be an approved assembly and so 410-40. Relocate to new 410-16(d). 'installed that the temperature limits of the materials used are 410-41. Relocate to new 410-16(e). not exceeded. 410-77. Relocate to 4)0-77(b) to new 410-29(e) and revise to SUBSTANTIATION: We are having problems where lights are listed read: Where show cases are cord connected, the secondary and labeled and are not properly installed as a complete circuit(s) of electric discharge lighting shall be limited to assembly. The hood and lights should be tested and approved to one show case. Change 410-77(c) to 410-77(b). meet Section 410-4 and Section 300-22(a). SUBSTANTIATION: Arranged to place requirements of the same PANEL RECOMMENDATION: Reject. subject in the same sections. PANEL COMMENT: See Panel action on Proposal No. 6, Section PANEL RECOMMENDATION: Accept. 410-4(c)(i). VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (

410-4(c)(1): Accept CMP 21 410-Editorial(HoD 1978 NEC): Reject CMP 21 SUBMITTER: TSC-Approved for the Purpose SUBMITTER: A. KnicKrehm, Los Angeles, CA ~6 See the Technical Subcommittee "Recommendations" 2 AmendArticle 410 as follows: under the definition of "Approved for the Purpose" in Article Part K shall be moved to follow Part F. 100. Part N shall be moved to follow relocated K. SUBSTANTIATION: See the TSC "findings" under the definition of Parts Q and R shall be moved to follow relocated N. "Approved for the Purpose" in Article 100. Part G shall be relocated to follow relocated R. PANEL RECOMMENDATION: Accept as Revised: Part H and J shall be relocated to follow relocated R~ Delete the words "approved for the purpose" and replace with All parts shall be reassigned letter designation. "identified for use within commercial cooking hoods." SUBSTANTIATION: To arrange the article so that general and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Installation requirements precede construction requirements for each of the s6bJects covered by the article. Article 410 does not comply with the editorial style of the Code. The proposed 410-4(c) (5) (New): Reject CMP 21 reorganization is in keeping with the editorial policy set forth SUBMITTER: IdahoChapter IAEI Boise, ID by the correlating committee. 7 (5) When fire extinguishing equipment is PANEL RECOMMENDATION: Reject. required, the energy supply to the appliance shall be PANEL COMMENT: See Panel action on Proposal No. 1A, Article 410. simultaneously interrupted upon actuation of the extinguishing VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. system. SUBSTANTIATION: To coordinate with NFPA 17 4-4.1 the amended addition will reduce fire hazards which would result from overheated appliances when extinguishing chemical is expended. PANEL RECOMMENDATION: Reject.

320 PANEL COMMENT: Proposal is not within the scope of Article 410-8: Reject CMP 21 410. CMP 21conferred with CMP 10 and there was a lack of SUBMITTER: Richard P. Kuchnicki, National Association of Home support for the Proposal. B-GTI-a-~-(NAHB) VOTE ON PANEL RECOMMENDATION: PROPOSAL: 11 Revise as follows: AFFIRMATIVE: 8. ~IIO-z~---.Fixtures in Clothes Closets. NEGATIVE: Wells. (a) Location. A fixture in a clothes closet shall be EXPLANATION OF VOTE: permitted to be installed: (1) on the wall above the closet WELLS: I concur with the fact that thls proposal, is not door, provided the clearance between the fixture and a storage within the scope of ~ 21 and Article 410. I disagree with the area where combustible'material may be stored within the closet statement that there was a lack of support for the proposal from is not less than 18 inches or is protected in accordance with Panel. For the record, I cite the comments of Panel 10 members Section 410-5 and (2) on the ceiling over an area which is In their vote following the December, 1978 Panel meeting. unobstructed to the floor maintaining an 18-inch clearance "Erickson: In its present form the proposal cannot be horizontally between the fixture and a storage area where inserted in Article 422.' I believe the proposal has merit and combustible material may be stored' within the closet. If the would like to see it reworked for Article 422." fixture is protected in accordance with Section 410-5, the "Mazzoni: In my view Code Making Panel 21 was correct in 18-inch clearance is not necessary. recognizing that the proposal did not belong in the referenced A flushed recessed fixture equipped with a solid lens shall be section of the Code. On the other hand, I strongly feel that considered outside the closet area. thls proposal does not belong In Article 422 since it is a SUBSTANTIATION: The current Code requirement is in requirement that affects the appliances when installed in a contradiction with Section 410-5. If a fixture is protected in particular application. This is a very complex issue and in my accordance with 410-5, the 18-inch clearance should not be vlew should be thoroughly discussed at the April meeting before necessary. Many builders are forced to use recessed fixtures in being subject to a vote by CMP 10." closets because it is impossible to attain the 18-inch "Jordan: .... I would support a proposal that requires electric clearance. Numerous fires have been reported due to recessed fat fryers located under ventilating equipment protected by a fixtures coming in contact with improperly manufactured fire extinguishing system to be automatically de-energized upon cellulose insulation. Even though Section 410-66 regulates operation of fire extinguishing system." insulation around recessed fixtures, it is impossible to enforce The vote in December of CMP 10 was 1 affirmative, 3 negative this regulation since insulation is added by the homeowner and, 5 not voting. It appears to me there are many and varied usually without a building permit. Homeowners are not familiar concerns about the wording but that the proposal does have some with the NEC. support and I don't want to see it lost between Panels. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 13, Section 4fO-8(a)(2). VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-4(d)-(New): Accept ~ CMP 21 SUBMITTER: Fred Mays, Albuquerque, NM C 8 Add now (d) as follows: --C-d~I~ixtures in Bathrooms. 410-8(a), Exception-(New): Reject CMP 21 (I) A fixture in a bathroom shall be on a circuit protected SUBMITTER: Ray H. Miller, Fond du Lac, WI by a ground-fault circuit-interrupter. 12 Add new exception as follows: (2) Hanging fixtures and pendants shall not be permitted Exception: Fluorescent fixtures shall be permitted to be directly above bathtubs, unless approved for damp or wet installed on the wall above the closet door. locations, and shall be marked, "Suitable for Damp Locations." SUBSTANTIATION: Many new homeowners and builders wish to have SUBSTANTIATION: Article 410 is very careful in defining the closet lights and with the restrictions of thermal insulation proper methods for installing fixtures in closets. The same near recessed fixtures, the Code makes it almost impossible to attention is required for fixtures in bathrooms. There is an install recessed closet lights in second floor bedroom closets. increasing trend toward the Installation of fixtures, There would be no hazard involved if the Code permitted a chandeliers, swag lamps and pendants over bathtubs, thereby two-foot fluorescent strip light above the closet door where the creating an extreme hazard. surface temperature, of the tube is no danger and it is in a • We cannot legitimately object to the installatlon of fixtures normally protected area. over bathtubs, because it is not specifically prohibited by PANEL RECOMMENDATION: Reject. NEC. We cannot say that a bathroom is a wet or damp location. PANEL COMMENT: See Panel action on Proposal No. 13, Section PANEL RECOI~HENDATION: Accept as Revised: 410-8(a)(2). (d) Pendants. Hanging fixtures and pendants shall be so VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. installed that the fixture is not 'less than 8 feet above the top of the bathtub. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-8(a)(2): Accept CMP 21 SUBMITTER: Clyde H. Craig, Toledo Chapter NECA PlTOPO-S'Xt-~." 13 Change last sentence of paragraph i2) to read: 410-8: Reject CMP 21 ~s enclosed surface fixture, r~cessed fixture with a SUBMITTER: Allen KnicKrehm Los Angeles Chapter, NECA solid lens or fluorescent strip may be used providing there is a PR~L: g Move the material in Section 410-8 regarding 6-inch clearance horizontally between the fixture and the in clothes closets, to a new Section 210-27 titled: storage area. "Lighting outlets permitted but not required." SUBSTANTIATION: Most closets in homes are 24 inches deep, SUBSTANTIATION: Article 210 new covers required outlets and making it impossible to install anything but recessed fixtures. receptacles. Section 410-8 more clearly follows the scope of Under today's insulation standards, it's not practical to Article 210 than Article 410. install recessed fixtures in second floor closets. The 18 inch PANEL RECOMMENDATION: Reject. requirement is too severe. PANEL COMMENT: The Panel does not agree with the supporting PANEL RECOMMENDATION: Accept as Revised: co~ent. Change the second paragraph as follows: A flush recessed VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. fixture with a solid lens, or a ceiling-mounted fluorescent fixture shall be permitted to be installed provided there is a 6-inch clearance~ horizontally, between the fixture and the storage area. ' 410-8: Reject , CMP 21 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: S. B. Koontz, Chesapeake Chapter IAEI ~ 10 Revise title as follows: 410-8. Incandescent Fixtures in Clothes Closets. SUBSTANTIATION: The biggest fire hazard seems to be the surface 410-11: Accept ~ CMP 21 temperature of the incandescent bulb and hot particles of metal SUBMITTER: TSC-Approved for the Purpose falling onto clothes. Since incandescent buIbs have a surface 151TOP-O-S'AL~-~: 14 See the Technical Subcommittee "Recommendations" temperature in the range of 500°F., and when broken will drop under the definition ~f "Approved for the Purpose" in Article hot particles, then it would seem that only these fixtures 100. should be considered. By clarifying that it is only SUBSTANTIATION: See the TSC "findings" under the definition of incandescent, it would allow fluorescent fixtures to be used, as "Approved for the Purpose" in Article 100. they have always been classified as "cold" lighting, and can PANEL RECOMMENDATION: Accept as Revised: even be touched after being on for long periods of time. This Delete "approved for the purpose" and replace with "identified would help some areas of the country where the main concern of ifor through wiring." fixtures installed in closets is to provide lighting only and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. not to provide any drying effect, as in some areas of the country where incandescent fixtures are used. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 13, Section 410-11, Exception-(New): Reject CMP 21 410-8(a)(2). SUBMITTER: Arnold W. Rodin, American Home Lighting Institute' VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative." PROPOSAL: 15 Add the following exception: ~ion: Branch circuit conductors having insulation suitable for at least gO°C (194°F) shall be used for wiring of 321 all ceiling outlet boxes on which a lighting fixture is, or may SUBSTANTIATION: The Uniform Building Code requires that be, mounted. The ampacity of 90°C wire shall be limited to the suspended ceilings be adequately supported. This is usually in ampacity of 60°C wire (140°F). the form of an iron wire support attached to the structural SUBSTANTIATION: With the advent of energy conservation, thermal ceiling members and the other end of the wire attached to the insulation is being used more and more to combat winter heat suspended ceiling frame me~ers. The lighting fixtures are then losses and summer heat gains in buildings. As a result, all new laid in the openings and secured only by light metal clips. construction, especially home construction, is being fitted with There have been numerous accidents occur when these metal clips greater amounts of thermal insulation. have been dis!odged causing fixtures to fall to the floor. In most instances, electrical outlet boxes to which surface There have been several instances, where fixtures are installed ceiling incandescent fixtures are attached and junction boxes .in end-to-end rows, when one fixture becomes dislodged from supplying power to recessed fixtures are engulfed in a heavy construction vibration causing the entire row to also fall to concentration of thermal insulation. This can lead to heat the floor. buildup in the outlet boxes which may exceed safe values. These There is also the danger of fixtures being shaken loose by higher temperatures are likely to destroy the insulation on seismic disturbances-Los Angeles, Oroville and Santa Rosa areas, wiring in the boxes, resulting in shock hazard, short circuits to mention a few~ locations. and fire. The condition may be further compounded when the Having these fixtures attached to the framing members also consumer chooses to ignore the fixture wattage marking and becomes a severe problem to firemen. When the ceiling area installs higher wattage lamps. becomes involved in a fire or enough heat generated from the In order to reduce the hazards that can be created by higher fire, the framing members distort and cause the fixtures to fall temperatures in ceiling outlet boxes, we request that branch ' through the openings. circuit conductors having insulation suitable for at least 90°C PANEL RECOMMENDATION: Reject. (lg4°F) be used for wiring of all ceiling outlet boxes on which PANEL COMMENT: CMAo agrees with the intent of the Proposal see a lighting fixture is, or may be, mounted. The ampacity limit action on Proposal No. 17A, Section 410-16(b). (15 amperes) for 60°C (140°F) conductors should be included to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. retain the benefit of the higher temperature rating of gO°C (Ig4°F) insulation. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Panel feels subject is adequately covered. 410-16(b): Accept CMP 21 VOTE ON PANEL RECO~NDATION: Unanimously Affirmative. SUBMITTER: CMP 21 COMMENT ON VOTE: 17A Revise second sentence as follows: Fixtures so KNICKREHM: This proposal referred to CMP 6; CMP 6 rejected ~ shall be securely fastened by mechanical means, such the proposal. as bolts, screws, or rivots to the ceiling framing member. SUBSTANTIATION: ~ 21 feels that friction alone is not an adequate means for fastening, hence the use of bolts, screws, or rivots. 410-14: Reject CMP 21 PANEL RECOMMENDATION: Accept. SUBMITTER: D. H. Mclntosh, E. I. du Pont de Nomours & Co. VOTE ON PANEL RECOMMENDATION: ~L: 16 Revise the second sentence as follows: AFFIRMATIVE: B. It shall be permissible to locate cord-connected fixtures NEGATIVE: Wells. directly below the outlet box if (a) the flexible cord is Type COMMENT ON VOTE: S, SO, ST or STO; (b) the cord is not subject to strain or DUFFY: Although I am voting affirmative I believe there are physical damage; and (c) the overall'length of methods other than the rivets, bolts or screws that are fixture-attached-cord does not exceed 6 feet. acceptable but can only be judged by the authority having SUBSTANTIATION: The word "suspend" cord-equipped fixtures jurisdiction at the time of installation. I believe this should directly below the outlet box is a poor word choice implying be clarified. that the cord and outlet box support the weight of the fixture. KNICKREHM: The revised wording does not prohibit (he use of The words "if the cord is continuously visible for its entire clan~s secured by the mechanical means mentioned in the proposal length" has absolutely nothing to do with safety to either in my opinion. persons or property, unless someone wants to devote their EXPLANATION OF VOTE: lifetime to watching the cord. This section of Code has been WELLS: Since there are listed clips for this purpose it seems frequently massaged in past Code revisions. This is an earnest to me they should be recognized. I suggest adding " .... screws, attempt to resolve the issue. Clips identified for the purpose, and rivets." UL has accepted and listed electric-discharge lighting fixture connections for hung ceilings consisting of wiring in flexible meta'l tubing terminating in an approved grounding plug (cap). With over 1,500,000 fixture-years, of trouble free service, and 410-16(c): Accept CMP 21 with fixture maintenance greatly enhanced by allowing the SUBMITTER: TSC-Approved for the Purpose fixture to be readily removable, it seems reasonable to P]TO'P-O-~FA-C~- 18 See the Technical Subcummittee "Recommendations" recummendthis excellent system. un-'n-dFe~-E~e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Reject. 100. PANEL COMMENT: The present wording adequately reflects the SUBSTANTIATION: See the TSC "findings" under the definition of Panel's intent. Panel feels subject is adequately covered. No "Approved for the Purpose" in Article 100. evidence to support the suggested change. PANEL RECOMMENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. {c) RacewayFittings. Racewayfittings used to support COMMENT ON VOTE: l lighting fixtures shall be suitable to support the fixture(s). WELLS~ The words "if the cord is continuously visible for its VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. entire length" relates directly to safety. These words COMMENT ON VOTE: effectlvely prohibit using a cord and plug to connect fixtures KIENER: I vote affirmative on this proposal; however, the in a lay in suspended ceiling where the ceiling panels would wording of the proposal could be in~)roved. I suggest the render the cord invisible. Since these spaces above such following as an alternative: ceilings/are frequently air handling spaces it is most "Raceway fittings used to support light fixtures shall be undesirable to have exposed plugs and receptacles which, over capable of supporting the total weight of the complete fixture time, would accumulate dust, grease and other potentially ass~ly." hazardous contaminants. i

410-18 (a): Reject CMP 21 410-14: Accept CMP 21 SUBMII-rER: G. A. Wintz Southern California IAEI SUBMITTER: CMP 21 19 Add a second sentence as follows: :~ 16A In the~second sentence delete the word "suspend" ~t and swag type incandescent lighting fixtures having l~an--nd--~e-pTace with "locate." exposed conductive parts and of types generally used in SUBSTANTIATION: The word "locate" better reflects the intent of dwellings shall be conspicuously marked "This fixture may be the Panel. unsafe where not properly connected to an outlet that is PANEL RECOMMENDATION: Accept. equipped with a means for grounding." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: Pendant and swag type fixtures are being found hung over bathtubs and the like. These fixtures are equipped with bare or green grounding conductors and are tested and listed for use when properly grounded. 410-16(b}: Reject CMP 21 However, millions of lighting outlets in existing dwellings SUBMII-TER: SouthwesternSection IAEI are not equipped with a means for grounding fixtures. 17 Revise as follows: Furthermore the grounded circuit conductor is unidentified at --~spended Ceilings. Framing members of suspended ceiling many existing lighting outlets supplied by knob and tube wiring. systems used to support fixtures shall be securely fastened to Most replacement lighting flx~Jres for dwellings are sold, each other and shall be securely attached to the building hung and used by persons who are unaware of these serious structure at appropriate intervals. In addition, lighting hazards attendant to the use of ungrounded or otherwise fixtures shall be independently supported at each end of each impnoperly connected fixtures within reach o£ wet grounded fixture. The usual iron wire used for suspended ceiling surfaces. supports shall be permitted for this purpose. PANEL RECO~tENDATION: Reject. 322 PANEL COMMENT: CMP bases its rejection on Section 90-1(c) conductors will be subjected. "This Code is not intended as a design specification nor an (FPN) For ampacity of fixture wire, see Table 402-5. instruction manual for untrained persons." (FPN) For maximu~ operating temperature and voltage limitation VOTE ON PANEL RECOMMENDATION: l of fixtures, wires, see Section 402-3. AFFIRMATIVE: 8. SUBSTANTIATION: The words "environmental conditions" better NEGATIVE: Licursi. reflect the requirements of (b) and the overall proposal is in EXPLANATION OF VOTE: agreement with the recoaraendations of the technical LICURSI: A negative vote was cast on the Panel Recommendation subcommittee--Approved for the Purpose. because experience has proven that many pendant and chain-hung PANEL RECOMMENDATION: Accept. fixtures are installed in bathrooms on branch circuits not VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. supplied with a grounding conductor. I cannot conscientiously ignore the impact a warning label on the fixture would have toward eliminating this very unsafe practice. 410-41: Accept CMP 21 SUBMITTER: TSC-Approved for the Purpose 23 See the Technical Subcommittee "Recommendations" un--6-d~-r--t-~e definition of "Approved for the Purpose" in Article 410-18(a): Reject CMP 21 100. SUBMITTER: International Association of Electrical Inspectors SUBSTANTIATION: See the TSC "findings" under the definition of 20 Add a sentence to (a) as follows: "Approved for the Purpose" in Article 100. Pendant and swag type incandescent lighting fixtures having PANEL RECOMMENDATION: Accept as Revised: exposed conductive parts and of types generally used in 410_41. Insulating Joints. Insulating joints that are not dwellings shall be conspicuously marked "This fixture may be designed to be mounted with screws or bolts shall have an unsafe where not properly connected to an outlet that is rexterior metal casing, insulated from both screw connections. equipped with a means for grounding," or words to that effect. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: Pendant and swag type fixtures are being found hung over bathtubs and the like. These fixtures are equipped with bare or green grounding conductors and are tested and listed for use when properly grounded. 410-42(a): Accept CMP 21 However, millions of lighting outlets in existing dwellings SUBMITTER: TSC-Approved for the Purpose are not equipped with a means for grounding fixtures. I~TO]~-S'A-C~ 24 See the Technical Subcommittee "RecommendationsZ' Furthermore, the grounded circuit conductor is unidentified at ~e definition of "Approved for the Purpose" in Article many existing lighting outlets supplied by knob and tube wiring. 100. Most replacement lighting fixtures for dwellings are sold, SUBSTANTIATION: See the TSC "findings" under the definition of hung and used by persons who are unaware of the serious hazards "Approved for the Purpose" in Article 100. attendent to the use of ungrounded or otherwise improperly PANEL RECOMMENDATION: Accept as Revised: connected fixtures within reach of wet grounded surfaces. (a) General. Portable lamps shall be wired with flexible cord PANEL RECOMMENDATION: Reject. recognized by Section 400-4 and an attachment plug of the PANEL COMMENT: CMP bases its rejection on Section go-1(c) polarized or grounding type. 'iThis Code is not intended as a design specification nor an Delete the exception. instruction manual for untrained persons. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 8. NEGATIVE: Licursi. EXPLANATION OF VOTE: 410-42(b)(2): Accept CMP 21 LICURSI: See Comment on Proposal No. 19. SUBMITTER: TSC-Approved fo~ the Purpose ~25 See the Technical Subcommittee "Recommendations" under the definition of MApproved for the Purpose" in Article 100. 410-20(New): Accept CMP 21 SUBSTANTIATION: See the TSC "findings" under the definition of SUBMITTER: Allen KnicKrehm, Los Angeles, CA "Approved for the Purpose" in Article 100. 21 Add section as follows: PANEL RECOMMENDATION: Accept as Revised: Equipment Grounding Conductor Attachment. Fixtures (2) Handlamps shall be equipped.with a handle of molded with exposed metal parts shall be provided with a means for composition or other insulating material. connecting an equipment grounding conductor for such fixtures. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: Wiring methods providing equipment ground COMMENT ON VOTE: conductors as a grounding means, such as nonmetallic raceway KIENER: I vote affirmative, but recommend the following syste~1~ and nonmetallic cable systems, must have a method change in wording: whereby the equipment ground connector can be connected to the "Handlamps shall be equipped with a handle of molded exposed metal parts of the lighting fixtures. composition or other insulating mater,ial capable of withstanding It has been brought to the writer's attention that drilling a the voltages involved." hole or fastening a grounding conductor to a listed or labeled fixture may void the listing of the fixture. Therefore it is felt necessary for the Code to provide a means for connecting the equipment grounding conductor to the fixture to assure 410-49: Reject CMP 21 compliance with the provisions of the Code. SUBMITTER: H. B. Love/B. L. Auger, Michigan Chapter IAEI PANEL RECOMMENDATION: Accept. 26 Revise to read: VOTEON PANEL RECOMMENDATION: Lampholders. AFFIRMATIVE: 8. (a) Lampholders installed in wet or damp locations shall be NEGATIVE: Short. of the weather-proof type. EXPLANATION OF VOTE: (b) Porcelain or metal shell sockets used as cord pendant SHORT: the proposal would require a method of attaching a lighting outlets shall not be permitted within reach of grounded grounding conductor on all fixtures. This is unnecessary, when portion of buildings. the fixture is connected with conduit. SUBSTANTIATION: Where such fixtures are used in areas containing high humidity, such as basements, they tend to collect moisture and become a shock hazard. PANEL RECOMMENDATION: Reject. 410-24(b): Accept CMP 21 PANEL COMMENT: The supporting comment does not Justify the SUBMITTER: TSC-Approved for the Purpose proposed change. Supporting comment is not persuasive as to I~R-O-P-O-S~At-~." 22 See the Technical Subcommittee "Recnmmendations" necessity. un--~-d-e~-~e definition of "Approved for the Purpose" in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. COMMENT ON VOTE: SUBSTANTIATION: See the TSC "findings" under the definition of WELLS: There is no definition or product category called "Approved for the Purpose" in Article 100. "weather-proof" and to accept this proposal without such would PANEL RECOMMENDATION: Accept. be meaningless. There are "wet location" and "damp location" IPANEL COMMENT: See CMP Proposal No. 22A. definitions and in view of the Panel's action on Proposal 4A the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. problems referred to in the substantiation supported the (b) portion of the proposal.

410-24: Accept CMP 21 t SUBMITTER: CMP 21 410-52: Accept CMP 21 PROPOSAL: 22A Add the words "environmental conditions" after SUBMITTER: Clyde H. Craig, Toledo Chapter NECA ~s "suitable for the." Delete (b), and'(a) becomes text Is-R-O-fs~-~L-~.• 27 Add additional sentence as follows: of 410-24. Fine print notes remain. To read as follows: ~ord shall be nonflammable or chain shall extend a 410-24. Conductor Insulation. Fixtures shall be wired with minimum of 10 inches frnm lamp holder. conductors having insulation suitable for the environmental SUBSTANTIATION: There have been cases of large wattage lamps Iconditions, current, voltage, and temperature to which the burning pull cord and causing smoldering cord to fall to fIoor 323 where flammable material may be present. receptacle. PANEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: TIA to the 1978 NEC. J Pull cord shall be nonflammable, or chain portion shall extend PANEL RECOMMENDATION: Accept. a minimum of 7 inches from the lampholder. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 8. NEGATIVE: Short. EXPLANATION OF VOTE: 410-S6(f)-(New): Reject CMP 21 SHORT: There is no evidence of a problem. Not a single case SUBMITTER: R. S. Pinkerton, Los Angeles, CA has been reported to the concerned manufacturers involving 32 Addnew if) as follows: accidents of this type. ---(-~'--(~perating at Over 300 Volts. Attachment plugs or other connectors supplying equipment at over 300 volts shall be of the skirted type or otherwise designed that arcs will be confined within the case of the plug or receptacle. 410-56(a)-(New): Reject CMP 21 SUBSTANTIATION: The users of electrical equipment have been SUBMITTER: R. C. Cressman, General Electric Co. severely injured when they attempted to plug in or connect a 2B Add new (a) and existing (a) becomes (b), etc. piece of faulty equipment to a circuit operating at over 300 ---~eptacles, cord connectors, and attachment plugs rated 15 volts. At this higher voltage a fault will produce severe and 20 amperes and intended for use with connection to portable arcing and violent discharge of molten metal which requires a cords shall be approved for the use intended (not.hard usage, skirted type of receptacle to provide workman safety. ,, hard usage, extra hard usage). PANEL RECOMMENDATION: Reject. SUBSTANTIATION: The Code presently recognizes in Table 400-4 PANEL COMMENT: Supporting comment is not persuasive as to three types of usages for portable cords (not hard usage, hard necessity. Existing devices, rated in excess of 300 volts, are usage, extra hard usage). The devices intended for use with tested at 150 percent of rated current at rated voltage. In these cords should be similarly recognized. The attachment addition, the Chairman has appointed a Task Force, chaired by plug, connector and receptacle receive abuse similar to that of Walter Short, to obtain further information for consideration cords. Plugs and connectors are subject to the same crushing for the next Code cycle. forces as portable cords. Plugs, connectors, and receptacles VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. can be damaged by abrupt removals, even more so than the cord. The requirements 6or a receptacle, cord connector, and / attachment plug for use in the home on AWG 18 SPT are quite different from those used in heavy industry on AWG 18 SO. 410-56(f)-(Newi: Reject CMP 21 Definitions of use difference have been made by NEMA (WD1-1974, SUBMITTER: Southwestern Section IAEI Part 3-General Duty and Heavy Duty), the Federal Government 33 Add subsection if) to 410-56 to read: (WC5996-E), the International Electrotechnical Commission ~perating At Over 300 Volts. Attachment plugs or other (Household Use and Industrial Use), and by UL 498 (Regular and connectors supplying equipment at over 300 volts shall be of the Hospital Grade). The recognition by the Code of two usage skirted type or otherwise designed that arcs will be confined differences would give guidance to UL to develop requirements to within the case of the plug or receptacle. meet the needs of the user as they have done in flexible cords. SUBSTANTIATION: The users of electrical equipment have been It would also serve as a basis for a single standard eliminating severely injured when they attempted to plug In or connect a the duplication now being done by the various agencies. piece of faulty equipment to a circuit operating at over 300 PANEL RECOMMENDATION: Reject. volts. At this higher voltage a fault will produce severe PANEL COMMENT: Supporting comment is not persuasive as to arcing and violent discharge of molten metal which requires a necessity. skirted type of receptacle to provide workman safety. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 32, Section 410-56(f). VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-56(b), Exception-(New): Reject CMP 21 SUBMITTER: Ted Steppe, Stepp-Elex Corp. 29 Add a new exception as follows: x-'~lon: A metallic faceplate of ferrous metals which is 410-56(g)-(New): Accept CMP 21 stamped in one piece and having a recessed center section of SUBMITTER: CMP 2 sufficient area to effectively seal a standard device box shall III~-O]~O~'A-L-~.• 29 (CMP 2) Revise as follows: have a thickness not less than 0.020 inch. -~{-~(~onductors. Receptacles rated 20 amperes or less SUBSTANTIATION: A faceplate with a recessed center is by far directly connected to aluminum conductors shall be marked CO/ALR. many times more rigid than any flat faceplate. We therefore SUBSTANTIATION: It was the action of the Correlating Committee feel that the thickness of the metal can be reduced from 0.030 to advise CMP 2 that the Correlating Committee has referred to 0.020 inches without giving up a large amount of strength, Proposal No. 29 to CMP 21 for action. because of the internal bends in the center of the faceplate. PANEL RECOMMENDATION: Accept. PANEL RECOMMENDATION: Reject. PANEL COMMENT: ThF'text of Section 210-7(g) (see Proposal No. PANEL COMMENT: The Panel does not agree with the supporting 29-CMP 2) has been revised and relocated to new Section comment. 410-56(g) as per action of the Correlating Co~nittee. VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

410-56(c): Accept CMP 21 410-57(b), Exception: Reject CMP 21 SUBMITTER: E. E. Carlton, Menlo Park CA SUBMITTER: O. E. Oillon, Border County Div. IAEI 30 Revise the second sentence as follows: )~rOl~O~'At-~.34 Deleteexception. ~ates shall be installed so as to completely cover the ~OI~S~F~J~rIATION: This section is legally unenforceable due to wall opening and seat against the wall surface. the use of the words "not likely" and "not usually." At the SUBSTANTIATION: To provide safety and prevent access to exposed time of inspection, the inspector cannot determine the future live metal parts. This islan accepted practice and should be use of the receptacle. See the attached opinion* of the San added to the Code. The same requirement presently is included Diego City Attorney. in Section 380-9 for switches. Addition of this proposal to *See Border County Div. IAEI substantiation for C~ I Proposal 410-56(c) will provide safety for receptacle outlet No. 90 for 110-16(a). installations also. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept as Revised: PANEL CO~MENT: CM@'-agrees with the intent of the Proposal see Delete the word "wall" before the word "opening." Delete the action on Proposal No. 34A, Section 410-57(b). word "wall" before the word "surface" and replace wlth VOTE ON PANE~ RECOMMENDATION: Unanimously Affirmative. "mounting." To read as follows: Faceplates shall be installed so as to completely cover the opening and seat against the mounting surface. PANEL COMMENT: C~ 21 feels that there are times when covers 410-57(b), Exception: Accept CMP 21 are required to seat against surfaces other than "walls" such as SUBMITTER: C~ 21 gaskets or surface-mounted boxes. II)~IOP~)-S'-A-L-~: 34A Delete the words "likely" and "usually." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~'I)~rS'~'~N~rIATION: The words "likely" and "usually" are not definitive of the requirement. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-56(e)(TIA 1978 NEC): Accept CMP 21 SUBMITTER: TIA 2-70-1978 31 Add a new Section 410-56(e) and change present ~h (e) to (f). {el Attachment Plug Ejector Mechanisms. Attachment plug ejector mechanisms shall not adversely affect engagement of the blades of the attachment plug with the contacts of the 324 410-57(b), Exception: Reject CMP 21 410-58(b)(4): Reject OMP 21 SUBMITTER: R. C. Medley, Square D Co. SUBMITTER: F. K. Kltzantides, NEMA ]~II)POS'XL-~.. 35 Deletethe words "self-closing." I~R-O-PO-S'A~-~..38 Revise as follows: ~'I]I~'rAI~FIATION: The reason for the request to remove "(-4")-- If the terminal for the equipment grounding conductor "self-cl6sing" results from the interpretation by UL based upon is not visible, or if terminal screw is removable, the conductor these words that any cover which required user assistance wlll entrance hole or the area adjacent to the terminal shall be no longer be acceptable for such usage effective January I, marked with the word "green" or the symbol " ~--~-_" or otherwise 1979, as covered by UL S14-C dated November 3, 1977, Paragraph identified by a distinctive green color. 10.6. It states: UA cover with a detent or other feature SUBSTANTIATION: The ground symbol "~" is an international designed to hold it open Is not to be assisted in closing." means of Identifying ground. It is used in electric drawings Unfortunately, the UL interpretation prohibits" a feature which and schematic diagrams. A symbol is used to transmit a message is of importance to the users of cover plates. Such p)ates are in a clear understandable manner independent of any language. typlcally used for switches as well as temporarily connected PANEL RECOMMENDATION: Reject. receptacles. A hold-open feature permits the user to open the PANEL COI~4ENT: The proposal to use a ground symbol to identify lid an.d then insert or remove a plug (or operate a switch) a groundlng terminal would not, in the CMP's opinion, further a11owing one hand operation. It also permits one hand closure the cause of electrical safety. The proposal to use a grounding with equal ease. symbol in lieu of the present green identification as required Such covers have been successfully used for over 15 years by the '78 NEC is unacceptable since it would increase the without incident. A hold-open feature is also of necessity to probability of miswiring of the device. the milllons of arthritically affected consumers, as well as VOTE ON PANEL RECOMMENDATION:

others of physical incapacity who use these covers on their AFFIRMATIVE: 8. - homes. NEGATIVE: Knickrehm. The removal of the term "self-closlng" will allow the use of COMMENT ON VOTE: weatherproof covers marked "Wet Location with Covers Closed" WELLS: The grounding symbol is unknown to millions of which will otherwise satisfy UL requirements. consumers who wire devices. Coloring the terminal provides PANEL RECOMMENDATION: Reject. color identification with the green wire. Using a technical PANEL COMMENT: The present wording adequately reflects the symbol on a product which can be wired by a broad spectrum of Pane I's lntent. non technical users is, in my opinion, wrong. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. EXPLANATION OF VOTE: COMMENT ON VOTE: KNICKREHM: This use of graphics to overcome language and WELLS: In my opinion, it is the specific intent of the color barriers is internationally accepted. The NEC should also present wording to prohibit what the submitter wants to permit. accept this fact. While It may be convenient for one-handed operation to have a cover stay open, It is also convenient for a user to fail to close the cover thus defeating the very purpose of the cover in the first place. Further, covers with hold-open features expose 410-58(c): Accept CMP 21 the open covers to physical abuse which may prevent their future SUBMITTER: Nathaniel J. Addleman, Wichita, KS effective use. PROPOSAL: 39 Add a sentence as follows: Grounding type ~nt plugs shall not be installed without a proper ground connection being made between the appliance and the grounding terminal of the plug. 410-68(a)(HOD 1978 NEC): Reject CMP 21 SUBSTANTIATION: At present there seems to be no explicit SUBMITTER: John M. Wall, Central Calif. Chapter, Fresno, CA prohibition against installing a grounding type attachment plug !~TOPI~S'~-~.'36 AmendSection 410-SB(a) to read: on an electrical cord w~thout a grounding conductor. Such an ~ounding type receptacles, cord connectors and installation could lead to the erroneous conclusion that the attachment plugs shall be provided with one fixed grounding pole appliance that has a "two wire cord" connected to a "three prong in addition to the circuit poles "and shall be polarized when of plug" is grounded, since the wire connections on the backside to the 2 parallel slot and blade configuration." the plug are usually hidden from view, and since it has become SUBSTANTIATION: There is a built-in safety feature in the common knowledge that a "three pron9 plug" means that the grounding type receptacles in the form of a wider slot and appliance to which it is connected {via the power cord) is associated terminal for the grounded circuit conductor and a grounded. narrower slot for the phase or hot circuit conductor and Section 410-58(c) is not explicit enough to prohibit the above termination of the parallel slot 16 ampere 125 volt misleading use of a grounding type attachment plug. configuration. This feature provides safety whereby a 2 wire PANEL RECO~FF4ENDATION: Accept as Revised: parallel polarized blade attachment plug and identified I Add a new {e] to 410-58 as follows: conductors and appliances may be used with a better degree of (e) Use. Grounding-type attachment plugs shall be used only safety. where an equipment ground is to be provided. PANEL RECOMMENDATION: Reject. VOTE ON PANEL RECOMMENDATION:' Unanimously Affirmative. PANEL COMI~ENT: No significant contribution to safety would result. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 8. Article 410, Part M: Reject CMP'21 NEGATIVE: Licursi. SUBMITTER: Warren Anderson, Mount Vernon, WA CO~IENT ON VOTE: !°ITOPl~'~B~-~.'40 Delete410 Part M. Rosettes WELLS: the present wording in 410-42 will require polarized ~]I~'AI~FIATION: The need to cover rosettes in the 1981 Code has plugs on portable lamps January I, 1980. Nothing in the disappeared with the dinosaur. substantiation Justifies requiring polarized plugs on two wire PANEL RECOMMENDATION: Reject. clocks, appliances, double insulated tools, etc. PANEL COMMENT: Present requirement is necessary. EXPLANATION OF VOTE: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. LICURSI: A negative vote was cast on the Panel Recommendation because with the requirement of 410-42(a) becoming effective January 1, 1980, there is no requirement in the Code that will provide a polarized receptacle for a two-wire polarized portable 410-64: Accept CMP 21 lamp. SUBMII'TER: TSC-Approved for the Purpose ~41 See the Technical Subcommittee "Recommendations" un--n-d-e-r-t~Te definition of "Approved for the Purpose" in Article 100. 410-58(a), Exception: Reject CMP 21 SUBSTANTIATION: See the TSC "findings" under the definition of Secretary's Note: It was the action of the Correlating "Approved for the Purpose" in Article 100. Committee that correlation may be necessary with Proposal PANEL RECOMMENDATION: Accept as Revised: Nos. 50 and 52 of Code-Making Panel 5. Delete the words "of a type approved for the purpose and SUBMITTER: John L. Bennett, Power Tool Institute shall" and replace with l 'identified for such installation.'i 37 Deletethe exception. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~I]B-~'~]~IATION: Thi~ Exception anticipates the connection of a ~oo1 or appliance to either a receptacle with a grounding pole or to a two pole receptacle without a grounding pole. The availability of grounded receptacles has increased to the point 410-64(a)-(New): Accept CMP 21 that there is very little advantage in the use of plugs with SUBMITTER: R. E. Ward, Tenn. Chapter, IAEI movable grounding poles. The installation of grounded I~TOTrO~K[~-.'42 Add new (a) as follows: receptacles or fixed adapters should be encouraged. There is no ---~ecessed or surface mounted incandescent fixtures' apparent need to condone the ungrounded use of a tool or installed indoors adjacent or on co(nbustible materials shall appliance which is normally required to be grounded. have thermal protection integral with the lampholders. PANEL RECOMMENDATION: Reject. Exception: Fixtures with miniature intermediate l ampholders. PANEL COMMENT: Supporting comment is not persuasive as to SUBSTANTIATION: Fires are being caused under present Code rules ~ecesslty. usually due to over-lamping or misuse of insulating materials. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. This proposal, if enacted, will give protection from this type hazard.

325 PANEL RECOMMENDATION: Accept as Revised: 410-66: Reject CMP" 21 Where recessed or surface-mounted incandescent fixtures are SUBMITTER: Ronald C. Zaker, Halo Lighting installed indoors, the lampholders shall have thermal protection I~q~O-S'A-L-T.'46 Add new sentence as follows: Thermal insulation integral within the l ampholder or otherwise thermally protected ~d in ceilings that contain recessed fixtures, shall be and identified for such conditions of use. Replacements for inspected, including retrofit installations. these l ampholders shall also be integrally protected. SUBSTANTIATION: Thermal insulation is being added to ceilings Exception No. 1: Fixtures with minature l ampholders. after recessed fixture installations have been inspected. This Exception No. 2: This requirement shall become effective normally occurs at the termination of the building construction January 1, 1982. or at a later date after the building is occupied as a retrofit PANEL COMMENT: CMP 21 has accepted the revised text and installation. In order to assure compliance with Section indicated the material be relocated to proposed Section 410-40 410-66, both installation types should be inspected. as per CMP 21 Proposal 1A. The absence of the requirement for such inspection constitutes VOTE ON PANEL RECOMMENDATION: a potential fire hazard. AFFIRMATIVE: 7. PANEL RECOMMENDATION: Reject. NEGATIVE: Duffy, Short. PANEL COMMENT: See Panel action on Proposal No. 42. ,COMMENT ON VOTE: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. WELLS: I vote affirmatively because I believe the magnitude of the problem, in part demonstrated by the many proposals from manufacturers and distributors of such fixtures, mandates action. Subsequent to the Panel Meeting, I have been informed 410-66: Reject CMP 21 of a patent which might directly affect "integral protection of SUBMITTER: R. A. Wiedemer, Jr., Hinkle Lighting l ampholders" and I believe the Panel, in its next meeting must PROPOSAL: 47 Add new sentence as follows: Retrofit thermal revise the wording so as to allow other equally effective means l-n-sula-L~Fon installed in ceilings tha~ contain recessed fixtures, of protection. shall be inspected. EXPLANATION OF VOTE: SUBSTANTIATION: In many instances thermal insulation is added DUFFY: I am voting negative on the proposal because it to ceilings after recessed fixtures have been inspected. This includes surface mounted units. Surface mounted incandescent is normally referred to as a retrofit installation. In order to fixtures labeled by Underwriters Laboratories since August of assure compliance with Section 410-66, the installation should 1978 have been tested and found acceptable for use on insulated be inspected. ceilings. These fixtures are identified by the letters IC The absence of the requirement for such inspection constitutes (Insulated Ceiling). Also I believe the technical complexity of a potential fire hazard. having the thermal protection integral with the lampholder is PANEL RECOMMENDATION: Reject. impractical. I would support the proposal with the deletion of PANEL COMMENT: See Panel action on Proposal No. 42. "or surface mounted" and I believe the requirement for integral VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. l ampholder thermal protection and replacement of such lampholders should be deleted. SHORT: The proposal should be altered to call for the fixture itself to have thermal protection rather than singling out the 410-66: Reject CMP 21 lampholder within the fixture. This would permit UL, in their SUBMITTER: Harold S. Minoff, L. D. Kichler Co. examination listing, to determine the hottest point of the PROPOSAL: 48 Add a new sentence as follows: Retrofit thermal fixture under an abnormal temperature test and that the thermal ~on installed in ceilings that contain recessed fixtures, protection within the fixture would be such as to control the shall be inspected. maximum temperature of that particular point of the fixture. SUBSTANTIATION: In many instances thermal insulation is added to ce111ngs after recessed fixtures have been inspected. This is normally referred to as a retrofit installation. In order to / assure compliance with Section 410-66, the installation should 410-66: Reject CMP 21 be inspected. SUBMITTER: Murray Feiss, American Home Lighting Institute The absence of the requirement for such inspection constitutes I~RI)]~S'AlZ~.'43 Add new sentence as follows: Retrofit thermal a potential fire hazard. l-6-s-~laTTon installed in ceilings that contain recessed fixtures, PANEL RECOMMENDATION: Reject. shall be inspected. PANEL COMMENT: See Panel action on Proposal No. 42. SUBSTANTIATION: In many instances thermal insulation is added VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. to ceilings after recessed fixtures have been inspected. This is normally referred to as a retrofit installation. In order to assure cempliance with Section 410-66, the installation should be inspected. 410-66: Reject CMP 21 The absence of the requirement for such inspection constitutes SUBMII-FER: Marvin Leichtung, Puritan Lighting Fixture Co. a potential fire hazard. PROPOSAL: 49 Add a new sentence as follows: Retrofit thermal PANEL RECOMMENDATION: Reject. '~on installed in ceilings that contain recessed fixtures, PANEL CO~V4ENT: See Panel action on Proposal No. 42. shall be inspected. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: In many instances, thermal insulation is added to ce111ngs after recessed fixtures have been inspected. This is normally referred to as a retrofit installation. In order to assure compliance with Section 410-66, the installation should 410-66: Reject CMP 21 be inspected. SUBMITTER: Arnold W. Rodin, American Home Lighting Institute The absence of the requirement for such inspection constitutes !~R'(I!~'AL-~.• 44 Add new sentence as follows: Retrofit thermal a potential fire hazard. l-6s'~-l-~-t-Ton installed in ceilings that contain recessed fixtures, PANEL RECOMMENDATION: Reject. shall be inspected. PANEL COMMENT: See Panel action on Proposal No. 42. SUBSTANTIATION: In many instances thermal insulation is added VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. to ceilings after recessed fixtures have been inspected. This Is normally referred to as a retrofit installation. In order to assure compliance with Section 410-66, the installation should be inspected. 410-66: Reject CMP 21 The absence of the requirement for such inspection constitutes SUBMITTER: Marc A. Katz, Fredrick Ramond, Inc. a potential fire hazard. PROPOSAL: 50 Add a new sentence as follows: Retrofit thermal PANEL RECOMMENDATION: Reject. ~on installed in ceilings that contain recessed fixtures, PANEL COMMENT: See Panel action on Proposal No. 42. shall be inspected. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: In many instances thermal insulation is added to ce~I1ngs after recessed fixtures have been inspected. This is normally referred to as a retrofit installation. In order to assure compliance with Section 410-66, the installation should 410-66: Reject CMP 21 be inspected. SUBMITTER: Harry W. Rothenberg, Timely Lighting The absence of the requirement for such inspection constitutes 45 Add new sentence as follows: Retrofit thermal a potential fire hazard. Insu~-6-s-~l~-t-fon installed in ceilings that contain recessed fixtures, PANEL RECOMMENDATION: Reject. shall be inspected. PANEL ~OMMENT: See Panel action on Proposal No. 42. SUBSTANTIATION: The push for energy savings has resulted in VOTE ON PANEL RECOMMENDATION:. Unanimously Affirmative. thermal insulation being added after recessed fixtures have been installed and inspected, in too many cases, years after installation of recessed fixtures. The reference to retroflt installation is as indicated above. To assure co~oliance with 410-66: Reject CMP 21 Section 410-66, the thermal installation should be inspected. SUBMITTER: A. Ebenstein, American Home Lighting Institute The lack of such a requirement to inspect creates a potential I~TOI~S'XL-~.'51 Add a new sentence as follows: Retrofit thermal fire hazard. insulation installed in ceilings that contain recessed fixtures, PANEL RECOMMENDATION: Reject. shall be inspected. PANEL COMMENT: See Panel action on Proposal No. 42. SUBSTANTIATION: In many instances thermal insulation is added VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. to ceilings after recessed fixtures have been inspected. This 326 is normally referred to as a retrofit installation. In order to The absence of the requirement for such inspection constitutes assure compliance with Section 410-66, the installation should a potential fire hazard. be inspected. PANEL RECO~ENDATION: Reject. The absence of the requirement for such inspection constitutes PANEL COMMENT: See Panel action on Proposal No. 42. a potential fire hazard. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOIC~ENDATION: Reject. PANEL COI~ENT: See Panel action on Proposal No. 42. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-66: Reject C~ 21 SUBMITTER: Reynolds K. Ohal, Santa Fe Springs, CA ~57 The following additional sentence should be added 410-66: Reject CMP 21 to Section 410-66. SUBMITTER: ai~ Wiederhold, Corbett Lighting, Inc. Retrofit thermal insulation installed in ceilings that contain 52 Add new sentence as follows: recessed fixtures shall be inspected. ~it thermal insulation installed in ceilings that contain SUBSTANTIATION: In many instances thermal insulation is added recessed fixtures, shall be inspected. to ceilings after recessed fixtures have been inspected. This SUBSTANTIATION: In many instances thermal insulation is added is normally referred to as a retrofit installation. In order to to ceilings after recessed fixtures have been inspected. This assure compliance with Section 410-66, the installation should is normally referred to as a retrofit installation. In order to be inspected. The absence of the require~nts for such assure compliance with Section 410-66, the installation should inspection constitutes a potential fire hazard. be inspected. PANEL RECOMMENDATION: Reject. The absence of the requirement for such inspection constitutes PANEL COVa4ENT: See Panel action onProposal No. 42. a potential fire hazard. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 42. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative~ 410-66: Accept CMP 21 SUBMITTER: TSC-Approved for the Purpose PITOP-O-S'AI_-~: 58 See the Technical Subcommittee "Recommendations" 410-66: Reject CMP 21 under the def!nition of "Approved for the Purpose" in Article SUBMITTER: SidneyWolkin, Lightolier, Inc. 100. 53 Add a sentence as follows: SUBSTANTIATION: See the TSC "findings" under the definition of Retrofit thermal insulation installed in ceilings that contain "Approved for the Purpose" in Article 100. recessed fixtures, shall be inspected to assure that no PANEL RECOMMENDATION: Accept as Revised: insulation is within 3 inches nor on top of fixture. Delete the words "approved for the purpose" and replace with SUBSTANTIATION: In many instances thermal insulation is added ]"Identified for installation within thermal insulation." to ceilings after recessed fixtures have been inspected. This VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. is normally referred to as a retrofit installation. In order to assure compliance with Section 410-66, the installation should be inspected. The absence of the requirement for such inspection constitutes 410-66: Reject CMP 21 a potential fire hazard. SUBMITTER: Frederick W. Van Cott, Sea Gull Lighting Products~ PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 42. PROPOSAL: 59 Add the following sentence: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~it thermal insulation installed in ceilings that contain recessed fixtures, shall be inspected, SUBSTANTIATION: In many instances thermal insulation is added to ceilings after recessed fixtures have been inspected. This 410-66: Reject CMP 21 is normally referred to as a retrofit installation. In order to SUBMITTER: Irwin Goldberg, Coronet Chandelier Originals assure compliance with Section 410-66, the installation should PROPOSAL: 54 Add a sentence as follows: be inspected. ~It thermal insulation installed in ceilings that contain The absence of the requirement for such inspection constitutes recessed fixtures, shall be inspected. a potential ~ire hazard. SUBSTANTIATION: In many instances thermal insulation is added PANEL RECOf~4ENDATION: Reject. to cei|ings after recessed fixtures have been inspected. This PANEL COVd~ENT: See Panel action on Proposal No. 42. is normally referred to as retrofit installation. In order to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. assure cempliance with Section 410-66, the installation should be inspected. The absence of the requirement for such inspection constitutes a potential fire hazard. 410-66: Reject CMP 21 PANEL RECOMMENDATION: Reject. SUBMITTER: K. V. Jester, Texas Chapter/IAEI PANEL COMMENT: See Panel action on Proposal No. 42. PROP~ 60 Revise as follows: VOTE ON PANEL RECO~V~IENDATION: Unanimously Affirmative. Recessed portions of enclosure S, other .than points of support, shall be sp~ced at least 1/2 inch from combustible material andsuch fixtures shall incorporate thermal protection when located in an area where thermal insulatiun will be 410-66: Reject CMP 21 installed. SUBMIl-rER: O. E. Dillon, Border County Div. IAEI Fixtures which are so designed or installed to physically ~OSAL: 55 Revise second sentence as follows: prevent thermal insulation from being installed within three ~ed fixture enclosures, wiring compartments or ballasts inches of the ~ecessed fixture enclosure, wiring compartment or shall not be installed within" three inches of thermal insulation ballast are not required to be thermally protected. or in such a location so that heat is entrapped and free SUBSTANTIATION: For several years the Code has attempted to circulation of air is prevented except when the fixture is deal with the problem of thermal insulation surrounding recessed listed for the use. lighting fixtures without a great deal of success. This is a SUBSTANTIATION: This section is practicably unenforceable as growing problem due to the energy conservation efforts where Che electrical inspector does not inspect or control the more and more insulation is being installed, especially in installation of thermal insulation. The use of the words homes. The present requirements in the Code of thermal "combustible material" without a definition of combustible insulation not being installed within three inches of recessed material renders this section legally unenforceable. See the fixtures is practically unenforceable by electrical inspectors. attached opinion* of.the San Diego City Attorney. When the fixtures are installed and inspected they co~iply with *See Border County Div. IAEI substantiation for proposal for" the Code but only until the insulation installers come on the 110-16(a). job. This problem is real and needs to be corrected by the PANEL RECOMMENDATION: Reject. electrical industry and not by placing requirements on people PANEL COMMENT: See Panel action on Proposal No. 42. (insulation installers) over whom we have little control. The VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. requirement for thermal protection for the fixtures themselves is not the complete solution to the problem but should relieve a situatiq~ which can only beceme worse with time. Therefore, the exception needs to be included to permit the installation of 410-66: Reject CMP 21 fixtures without thermal protection where other safeguards are SUBMITTER: Julian Chacon, Lightcraft of California provided or where in some cases thermal insulation will not be 56 Add new sentence as follows: installed. Retrofit thermal insulation installed in ceilings that contain PANEL RECOMMENDATION: Reject. recessed fixtures, shall be inspected. • PANEL COMMENT: See Panel action on Proposal Nos. 42 and 63A. SUBSTANTIATION: In many instances thermal insulation is added VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. to ceilings after recessed fixtures have been inspected. This is normally referred to as a retrofit installation. In order to assure compliance with 410-66, the installation should be inspected.

327 410-72: Accept CMP 21 410-80 (b): Accept CMP 21" SUBMITTER: TSC-Approved for the Purpose SUBMITTER: TSC-Nominal Voltage 61 See the Technical Subcommittee "Recemmendations" J~ 65 Change"supply" to "circuit." ~er the definition of "Approved for the Purpose" in Article ~'~)I~7"~NI"IATION: For the sake of uniformity in terminology 100. consistent with recommendations being made by the TSC for usage SUBSTANTIATION: See the TSC "findings" under the definition of throughout the Code. "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept. PANEL RECOMMENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Delete the words "approved for the'purpose" and replace with or other suitable insulating materials." VOTE ON'PANEL RECOMMENDATION: Unanimously Affirmative. "Article 410 Part S-(New): Accept CMP 21 SUBMITTER: Stephen D. Channer, Business and Institutional Manufacturer's Assn. BIFMA 410-73(b): Accept CMP 21 PROPOSAL: 66 Add Part S at the end of Article 410 as follows: SUBMITTER: TSC-Nominal Voltage S. Special Provisions for Office Furnishings J~ROPOSAL: 62 Change"supply" to "circuit." 410-100. General. Wiring systems shall be listed and approved SUBSTANTIATION: For the sake of uniformity in terminology for the purpose of providing power for lighting and office consistent with recommendations being made by the TSC for usage appliances to office furnishings. throughdut the Code. 410-101. Other Articles. All articles of the Code shall apply PANEL RECOM~IENDATION: Accept. where applicable. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 410-102. Flexible Cords and Cables. (a) Office furnishings shall be permitted to be connected by flexible cords or cables to outlets approved for the purpose. (b) Flexible cords and cables shall be permitted for the 410-73(e), Exception: Reject CMP 21 wiring within office furnishings approved for the purpose. SUBMITTER: O. E. Dillon, Border County Div. IAEI SUBSTANTIATION: Thls proposal concerns itself with wiring ~63 In the Exception to (e), add the phrase "i.e., systems as provided by members of our industry with office does not employ capacitors" to the end of the sentence. furniture'systems that are now being used extensively in offices SUBSTANTIATION: The exception renders this section legally throughout the United States. Although not exclusively, office unenforceable as there is no definition of a simple reactance furniture systems are primarily used In areas referred to as ballasts. See the attached opinion* of the San Diego City "open plan" or "landscape" office layouts. Attorney. Within our industry, office systems furniture has grown in *See Border County Div. IAEI substantiation for C~ 1 Proposal popularity to a great extent over the past several years. Much No. 90 for 110-16(a). I of the popularity stems from the advantages of portability and PANEL RECOMMENDATION: Reject. ease of rearrangement. Today the sales of this type of PANEL COr~4ENT: The present wording adequately reflects the furniture are well over $300 million dollars annually and Panel's intent. The Panel does not agree with the supporting growing. Due to energy conservation requirements users have comment. demanded the inclusion of task and ambient lighting with this VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. type of furniture. Current industry estimates show that approximately 80 percent of all office furniture systems sold contain electrical power. When such power is provided by manufacturers within our association, safety is foremost in 410-73(f)-(New): Accept CMP 21 their consideration and all wiring systems have been or are in • SUBMITTER: CMP 21 the process of being submitted to and listed by Underwriters PROPOSAL: 63A Add (f) as follows: Laboratories or other nationally recognized testing laboratories. ~ere recessed high-intensity discharge fixtures with Our industry is very proud of its concern for product safety integral ballast are installed indoors, the ballasts shall have and performance and the good record that it currently enjoys. thermal protection integral within the ballast. Replacements Our purpose in submitting the enclosed proposal to the National for these ballasts shall also be integrally protected. Fire Protection Association is to establish a category within Exception: This requirement shall become effective January 1, the National Electrical Code that deals specifically with 1982. products made within our industry that contain wiring systems SUBSTANTIATION: CMP 21 extends the same protection to provide and to provide in writing the standard of quality that must be for recessed high-intensity discharge fixtures that is now adhered to by those making such systems. applied to fluorescent fixtures. Your review and favorable consideration of this proposal will PANEL RECOMMENDATION: Accept. be very much appreciated by the business and institutional VOTE ON PANEL RECOMMENDATION: furniture industry. AFFIRMATIVE: 8. PANEL RECOMMENDATION: Accept as Revised. NEGATIVE: Short. COMMENT ON VOTE: S. SPECIAL PROVISIONS FOR LIGHTING ACCESSORIES DUFFY: Although I am voting affirmative I believe further AND WIRED PARTITIONS consideraton of the effective date may be necessary to allow time for development and implementation of the,protection 410-100. General. Wiring systems shall be identified as program. suitable for providing power for lighting accessories and WELLS: See Comment on Proposal No. 42. appliances in wired partitions. These partitions shall not EXPLANATION OF VOTE: extend from the floor to ceiling or exceed 7 feet in height. SHORT: This requirement is unnecessary because HID ballasts fail in a low resistance mode which results in blowing of fuses 410-103. Other Articles. Wherever the requirements of other or tripping of circuit breakers whereas fluorescent ballasts articles of this Code ~nd Part S of Article 410 differ, the fail in a high resistance mode. requirements of Part S, Article 410 shall apply.

410-106. Wireways. All conductors and connections shall be contained within wiring channels of metal or other material 410-75(b): Reject CMP 23 identified as suitable for the conditions of use. Wiring SUBMITTER: Norman B. Cooney, Parma, OH channels shall be free of projection or other conditions that 64 Revise Section 410-75(b) as follows: may damage conductor insulation. ~nt exceeding 300V may be installed in dwelling occupancies if the design prevents exposed live parts. (FPN) Conductors as used in this section do not include SUBSTANTIATION: These sections are so confusing I don't believe flexible cord. an explanation is possible. Yo~ can, you can't, you can. Which is it? Can you or can't you? 410-108. Partition Interconnections. The electrical connection I would think somewhere In this morass of perplexibility that :between partitions shall be a flexible assembly marked for use someone would correlate the different CMP's and come up with a with wired partitions. viable solution to this absurdity. Exception: Flexible cord shall be permitted for the How can someone be expected to intelligently enforce connection between partitions provided all of the following provisions of theNEC when they are written in thls fashion? conditions are met. Simplicity in articles and words should be the byword of the ' a. The cord is extra-hard usage type. NEC, not the confusion that is usually expressed. b. The partitions are mechanically contiguous. PANEL RECOMMENDATION: Reject. c. The cord is not longer than necessar~ fo~ maximum PANEL COMMENT: The present wording adequately reflects the positioning of the partitions but, in no case to exceed 2 feet. Panel's intent. d. The cord is terminated at an attachment plug and cord VOTE ON PANEL,RECOMMENDATION: Unanimously Affirmative. connector with strain relief. 410-110. Lighting Accessories. Lighting equipment marked for use with wired partitions shall comply with all of the following: (a) Support. A means for secure attachment or support shall be provided. (b) Connection. Where cord and plug connection is provided, 328 the cord length shall not exceed 8 feet~ EXPLANATION OF VOTE: (c) Receptacle Outlet. Convenience receptacles shall not be DUFFY: I am no~ voting on this proposal as such action may be )ermitted in lighting accessories. interpreted as self-serving.

%10-112. Fixed Type. Wired partitions that are fixed (.secured to building surfaces) shall be permanently connected to the building electrical system by one of the wiring methods of 600-5: Accept C~ 21 Chapter 3. SUBMITTER: Allen KnicK~ehm, Los Angeles NECA PROPOSAL: 68 Delete the reference to "Article 250" and replace 410-115. Free-Standing Type. Partitions of the free-standing w--1-t'h--~-~-ectlon 250-97." Delete Exception Nos. I and 2. type (not fixed) shall be permitted to be permanently connected SUBSTANTIATION: Problem: Bonding rules for signs, etc., appear to the building electrical system by one of th~ wiring methods in two places and are not the same. of Chapter 3. Rules should not be repeated by different C~'s as their Individual partitions of the free-standing type, or groups of proposal shows. ExceptionNo. I does not provide for safety of not more than six individual partitions which are mechanically workers as required by OSHA. ExceptionNo. 2 is provided for by contiguous, shall be permitted to be connected to the building changing the reference to Section 250-97. electrical system by a single flexible cord and plug provided If this proposal is not in compliance with Section 90-3, then all of the following conditions are met. Section 250-97 should be deleted and a reference to signs and (a) Cord Type. The flexible power-supply cord shall be Section 600-5 should be included in Section 250-2. extra-hard usage or hard usage type with No. 12 AWG or larger PANEL RECOMMENDATION: Accept as Revised: conductors with a green grounding conductor and not exceeding 18 Section 600-5 and Exception No. 1 to remain as is. Revise inches in length, , Exception No. 2 by adding the words "protected from physical (b) Supply Receptacle. The receptacle supplying power shall damage," a~ter the word "conductors." be located not more than 12 inches from the partition which is VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. connected to it. The receptacle supplying groups of partitions shall be on a separate circuit serving no other loads. (c) Multiwire Circuits. Individual partitions, or groups of individual partitions where connected together, shall not ARTICLE 600 -- ELECTRIC SIGNS AND OUTLINE LIGHTING contain multiwire circuits. (d) Number of Receptacle Outlets. Individual partitions, or 600-5, Exception No. 2: Reject cMP 21 groups opf interconnected individual partitions, shall not SUBMITTER: ~Peter Pollak, The Aluminum Association contain more than thirteen 15-ampere 125-volt receptacle outlets. ~69 After "No. 14" add "copper or No. 12 aluminum.... " PANEL COMMENT: This Panel Proposal recognizes the existence of ~IATION: This proposal is submitted to clarify the wired partitions for offices, schools and other applications and proper size equivalent of aluminum conductor for the establishes rules concerning the construction and installation application. The size limitation is based upon an ampacity of the electrical system within and feeding these partitions. requirement which can be met with an aluminum conductor sized to This type of equipment contains receptacles and lighting provide the required an~)acity. The panel is referred to the equipment and is, in the Panel's opinion similar to showcases proposed revision in Section 110-5. which are within the scope of Article 410 and covered in Section PANEL RECOMMENDATION: Reject, 410-29. Section 410-29 served as a source for many of the PANEL COMMENT: Already covered by Section 110-15. proposed requirements. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: B. NEGATIVE: KNICKREHM. COMMENT ON VOTE: 600-6(c)-(New): Accept , CMP 21 WELLS: I suppo[t the Panel Recommendation and point out that SUBMITTER: R. S. Pinkerton, Electrical Code Advisory Committee subsequent to the meeting, I have become aware of some Panels for-C-~t-y of Los Angeles with no flexibility between panels. The Panel should review PROPOSAL: 70 Add a new (c) as follows: 410-108 in this context. ~omputed Load. The load for the required branch circuit EXPLANATION OF VOTE: installed for thesupply of exterior signs or outline lighting KNICKREHM: It is my belief that this material does not fall shall be computed at a minimum of 1200 watts. within the scope of Article 410. The UL employee who listed SUBSTANTIATION: Although the Code requires a sign circuit to be this material before it was recognized by the NEC is a me~)er of installed, it does not provide for a minimum computed load for C~4P 21 and for that reason, I believe, the propbsal was assigned this circuit. Unrealistically low loads of 180 or 200 watts to CMP 21 for a fair appraisal, that it has recieved, but the have been shown on the initial installation which has resulted subject does not, in my opinion belong in the Article 410, in overloaded feeders when the 'real' sign of 1,000-1,500 watts chapter 4 "Equipment for General Use" it should be in chapter 6 is installed. The 1,200 watt minimum load is a realistic value "Special Equipment." The Panel Recommendation is good and could for the average sign installation and will prevent many costly be used with little change in a new Article, which should also feeder changes caused by failure to properly provide for the include fixture connections by cabIe assembies. The future sign load on the initial installation. effective date is required because a device "identified for this PANEL RECOMMENDATION: Accept ~s Revised. use" is not now available. I Change "watts" to "volt-amperes." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

ARTICLE 600 -- ELECTRIC SIGNS AND OUTLINE LIGHTING 600-6(c)-(New): Reject CMP 21 600-2(b): Accept CMP 21 SUBMITTER: J. J. Kark, National Manufacturers Assn., SUBMITTER: TSC-Approved for the Purpose 71 Add now (c) as follows: ]~-RI)-PI~'-AL-~." 67 See the Technical Subcommittee "Recommendations" ~round-Fault CircuAt-lnterrupter Required. Receptacles un-un-de~--tlTe definition of "Approved for the Purpose" in Article supplying outdoor portable, cord- and plug-connected signs shall 100. be protected by a ground-fault circuit-interrupter for personnel. SUBSTANTIATION: See the TSC "findings" under the definition of SUBSTANTIATION: Portable cord- and plug-connected signs used "Approved for the Purpose" in Article 100. along the roadside, fed from extension cords at the building PANEL RECOMMENDATION: Accept as Revised: pose an unsafe condition. The signs are constantly exposed to Delete the words "a type approved for the purpose" and replace vandalism and the elements. Their supply is by flexible cords with "rated for controlling inductive load(s)." which may be laid across an active roadway, being repeatedly run VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. over by vehicles. The signs have metal frames and are often on rubber tires. It wasn't until the 1978 Code that portable signs were required to be grounded. There are numerous signs built before this change which are still in use. Therefore, if a 600-4: Accept CMP 21 line-to-frame fault occurs, a person standing on the ground and SUBMITTER: CMP 21 touching the frame will provide a ground return path. Even if PROPOSAL: 67A Delete Section 600-4. an equipment ground was installed, the usage conditions make it ~IATION: This proposal was presented by CMP 21 member, unlikely that it will be adequate for any appreciable time. Walt A. Mueller. Attached are copies of newspaper clippings which document three A Task Force has been appointed by the CMP 21 Chairman to (3) deaths and three (3) shocks.. Many enforcement people have study any possible hardships this section has imposed on the voiced concern regarding this situation. sign industry. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept as Revised. PANEL COMMENT: See Panel action on Proposal No. 73A. 6(]i5--4. Listing Required. Every electric sign of any type, VOTE ON PANEL RECOMMENDATION: fixed or portable shall be listed and installed in conformance AFFIRMATIVE:~ 8. with that listing; unless otherwise permitted by special NEGATIVE: Short. permission. EXPLANATION OF VOTE: VOTE ON PANEL RECOMMENDATION: SHORT: I feel that this proposal will provide more safety AFFIRMATIVE: 8. than Proposal No. 73A which does not protect personnel from NOT VOTING: Duffy. damaged cords.

329 REPORT OF CODE-MAKING PANEL NO. 10 422-14(a), Exception: Accept CMP 10 SUBMITTER: TSC-Approved for the Purpose ARTICLE 422 -- APPLIANCES PR--R~-~O'~-~.7 See the Technical Subcommittee "Recommendations" un--h-'d-6F-~ITe definition of "Approved for the Purpose" in Article 422 -I: Accept CMP 10 100. ~ SUBMITTER: TSC-Approved for the Purpose SUBSTANTIATION: See the TSC "findings" under the definition of IIR-O-I~O-~-AZ'~: I See the Technical Subcommittee "Recofnmendations" "Approved for the Purpose" in Article I00. under the definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. Exception: Water heaters with supply water temperature of SUBSTANTIATION: See the~TSC "findings" under the definition of 180°F or above and a capacity of 60 kW or above and identified "Approved for the Purpose" in Article 100. as being suitable for this use; and water heaters with a PANEL RECOMMENDATION: Accept as Revised: capacity of one gallon or less and identified as being suitable Delete the second sentence. for such use. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

422-3: Accept CMP 10 422-14(b): Accept CMP 10 SUBMITTER: Claude E. Deering, Jr., American Petroleum Institute SUBMITTER: CMP 2 !~TOITO~-~." 2 Add the word "classified" in parenthesis after 7A Revise (b) as follows: "hazardous." ~orage-type Water Heaters. All fixed storage-type water SUBSTANTIATION: It is proposed that the word "classified", in heaters having a capacity of 120 gallons or less shall have a parentheses, be inserted after the word "hazardeu~." This is branch-circuit rating not less than 125 percent of the nameplate consistent with Article 500, which, is entitled "Hazardous rating of the water heater. (Classified) Locations." The proposed wording recognizes that a Delete the fine print note. location is not hazardous per se, but is classified depending on SUBSTANTIATION: For clarification of intent. the properties of the flammable or combustible substance which PANEL RECOMMENDATION: Accept the (b) portion of the proposal. may be present, and the likelihood that a flammable or PANEL COMMENT: CMP feels the fine print note is necessary and combustible concentration or quantity will be present. should be retained. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

422-15(a): Accept CMP 10 422-5(a), Exception No. 2: Accept CMP 10 SUBMITTER: TSC-Approved for the Purpose SUBMII-FER: W. Creighton Schwan, Hayward, CA 8 See the Technical Subcommittee "Recommendatiens" I 1~-OPb-~--~." 3 Place a comma after the words "motor-operated un--n-d-er--t~e definition of "Approved for the Purpose" in Article ~e." 100. SUBSTANTIATION: As the exception is presently punctuated, a 25% SUBSTANTIATION: See the TSC "findings" under the definition of increase in branch circuit rating is required for every "Approved for the Purpose" in Article 100. appliance "other than a motor-operated appliance that is PANEL RECOMMENDATION: Accept as Revised: continuously loaded." Revised as proposed, the phrase "that Is Delete the phrase "approved for the purpose" and replace with continuously loaded" will properly apply to the appliance in the "identified as suitable for use with infrared heating lamps opening phrase, "For an appliance," not to "a motor-operated rated 300 watts or less. appl iance." VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. PANEL RECO~AMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 422-15(b), Exception: Accept CMP 10 • SUBMITTER: TSC-Approved for the Purpose 422-8(d)(I): Accept CMP 10 g See the Technical Subcommittee "Recommendations~ SUBMITTER: S. Mazzoni, Underwriters Laboratories Inc. under t--~e deflnlt$on of "Approved for the Purpose" in Article I iSR~P~T~'~AL-~.'4 Add "SO" after "STO." 100. ~IATION: Type SJ cord is a Junior Hard Service Cord per SUBSTANTIATION: See the TSC "findings" under the definition of Table 400-4 of the NEC and Is equivalent to SJO, SJT, SJTO and "Approved for the Purpose" in Article 100. there is no technical Justification for its exclusion. I PANEL RECOMMENDATION: Accept as Revised: believe that it was the intent of C~-10 that it be included and Exception: Lampholders identified as suitable for use with its exclusion was inadvertent. infrared heating lamps rated more than 300 watts. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

422-16: Reject CMP 10 422-8(d)(I): Reject CMP 10 SUBMITTER: G. A. Wintz, Southern California Chapter IAEI SUBMITTER: H. B. Love/B. L. Auger, Michigan Chapter, IAEI !~TOI~-O-S'AL-~. 10 Deletethe first paragraph and replace with: 5 Reviseto read: provisions of Article 250 apply to the grounding of -----~Residential food waste disposers'. All such equipment appliances. and controls in dwelling type occupancies shall be provided with SUBSTANTIATION: The present wording "Metal frames of an independent disconnecting means within sight of the equipment electrically heated appliances operating on circuits over 150 and it shall be readily accessible. Food waste disposers of volts to ground, shall be grounded in the manner specified in one-half horse-power or less shall be wired only with heavy duty Article 250" is misleading as the requirements of Section 250-42 3-wire minimum No. 16 hard service cord and approved cap and are more stringent than those of Section 422-16. three wire "U" slot grounding type receptacles. On new The provisions of Section 90-3 do not provide means whereby construction, a disconnect switch shall be mounted in the wall requirements of Articles 250 and 422 can differ. The proposal adjacent to the sink. is intended to eliminate thls inconsistency. SUBSTANTIATION: To assure the unit is always grounded we PANEL RECOI~ENDATION: Reject. propose the above. Our experience shows space under the sink is PANEL CO¥1~ENT: CMP agrees with the intent of the Proposal. See usually used for storage resulting in damage to the connections action on Proposal No. IOA, Section 422-16. of any other wiring methods. Now electrical personnel servicing VOTE ON PANEL RECOI~ENOATION: Unanimously Affirmative. these units often do not restore wiring to it's original condition. The switch provides safety should a foreign object fall into the appliance. PANEL RECOMMENDATION: Reject. 422-16: Accept CMP 10 PANEL COMMENT: The present wording adequately reflects the Secretary's Note: It was the action of the Correlating Panel's Intent. Co~=~ittee that the Panel correlate with Panel S's Proposal VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. No. 53 on Section 250-60. SUBMITTER: ~ 10 PROPOSAL: IOA Revise as follows: Grounding. All exposed metal parts of appliances 422-8(d)(2): Accept CMP 10 likely to become energized shall be grounded as required in SUBMITTER: S. Mazzoni, Underwriters Laboratories Inc. Article 250. J I~6 Add "SJ" after "STO." (FPN) See Sections 250-42~ 250-43 and 250-45 for equipment ~O~-ST~N-TIATION: Type SJ cord is a Junior Hard Service Cord per grounding' of refrigerators and freezers and Sections 250-57 and Tab.le 400-4 of the NEC and is equivalent to SJO, SiT, SOTO and 250-60 for equipment grounding of electric ranges, wall-mounted there is no technical Justification for Its exclusion. I ovens, counter-mounted cooking units, and clothes dryers. believe that ~t was the intent of CMP 10 that it be included and SUBSTANTIATION: ~ 5 is to be advised of this proposal and its exclusion was inadvertent. requested to delete from Section 250-2 "Appliances Section PANEL RECOI~4ENDATION: Accept. 422-16" and delete Exception No. 2 toSectlon 250-45(b). VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 178 PANEL RECOMMENDATION: Accept as revised. PANEL COMMENT: The present wording adequately reflects the 422-15. Grounding. Appliancesrequired by Article 250 to be Panel's intent. grounded shall have exposed noncurrent-carrying metal parts VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. rounded in the manner specified in Article 250. ~FPN) See Sections 250-42, 250-43 and 250-45 for equipment grounding of refrigerators and freezers and Sections 250-57 and 250-60 for equipment grounding of electric ranges, wall-mounted 422-27(a): Accept CMP 10 ovens, counter-mounted cooking units, and clothes dryers. SUBMITTER: IdahoChapter, IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 15 Reword422-27(a) to include (f) which would then (a) Appliances shall be considered as protected against overcurrent if supplied by branch circuits as specified in (e) 422-16: Reject CMP 10 and (f) below and in Sections 422-5 and 422-6. SUBMITTER: International Association of Electrical Inspectors SUBSTANTIATION: No direct reference is made to requirements for 11 Revisethe first paragraph as follows: overcurrent protection of water heaters of larger types. By Grounding. The provisions of Article 250 apply to the including Part (f) in this section, specific requirements will grounding of appliances. be prescribed. (No change In the Exception and the remainder of the Section) PANEL RECOMMENDATION: Accept. SUBSTANTIATION: The present wording "Metal frames of VOTE ON PANEL RECOMMENDATION: electrically heated appliances operating on circuits over 150 AFFIRMATIVE: 10. volts to ground, shall be grounded in the manner specified in NEGATIVE: Jordan. Article 250" is misleading as the requirements of Section 250-42 EXPLANATION OF VOTE: are more stringent than those of Section 422-16. JORDAN: Section-422-27(2) gives requirements for protection The provisions of Section 90-3 do not provide means whereby of branch circuits. The (3) references given - "(e), 422-5 and requirements of Articles 250 and 422 can differ. The proposal 422-6" - are all requirements for branch circuit protection and is intended to eliminate, this inconsistency. not supplementary protection. There is enough confusion in the PANEL RECOMMENDATION: Reject. industry as it is, concerning the difference between PANEL COMMENT: CMP agrees with the intent of the Proposal. See "branch-circuit protection" and supplementary protection." action on Proposal No. IOA. Let's not promulgate the confusion. VOTE ON PANEL RECOI~(ENDATION:, Unanimously Affirmative.

422-27(f), Exception No. 2 b.: Accept CMP 10 422-21(c)-(New): Reject CMP 10 SUBMITTER: TSC-Approved for the Purpose SUBMITTER: H. B. Love/B. L. Auger, Michigan Chapter, IAEI 16 See the Technical Subcommittee "Recommendations" lPITOITO-~XL-T." 12 Add (c) as follows: un--n-a'e~-t-~e definition of "Approved for the Purpose" in Article T~ Space Heating Equipment (other than electric heat). 100. (1) A readily accessible disconnect switch shall be mounted SUBSTANTIATION: See the TSC "findings" under the definition of on the exterior of the heating equipment or on a surface "Approved for the Purpose" in Article 100. adjacent to the heating equipment. PANEL RECOMMENDATION: Accept as Revised: (2) Heating equipment which is not readily accessible shall b. Elements are completely contained within an enclosure have an additional disconnect installed at the nearest readily identified as suitable for this use, or .... accessible location. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: Providing for safety in servicing of the unit, a disconnect shall be located at the unit. Providing for safety of the person using the unit, a disconnect means shall be provided which is readily accessible in the event of firmer ARTICLE 424 -- FIXED ELECTRIC SPACE HEATING EQUIPMENT explosion. PANEL REC~ENDATION: Reject. 424-1: Accept CMP 10 PANEL COMMENT: The supporting comment does not justify the SUBMITTER: TSC-Approved for the Purpose proposed change. Xhe present wording adequately reflects the 17 See the Technical Subcommittee "Recommendations" Panel's intent. See Sections 422-20, 422-21(b), and 422-26. the definition of "Approved for the Purpose" in Article VOTE ON PANEL RECOMMENDATION: 100. AFFIRMATIVE: 10. SUBSTANTIATION: See the TSC "findings" under the definition of NEGATIVE: Riley. "Approved for the Purpose" in Article 100. EXPLANATION OF VOTE: PANEL RECOMMENDATION: Accept as Revised: RILEY: The International Association of Electrical Inspectors Delete the second sentence. views this'proposal solely on the merit of: "Personnel VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Protection" and for no other reason(s).

424-2: Accept CMP 10 422-22(c): Reject CMP 10 SUBMITTER! Claude E. Deering, Jr., American Petroleum Institute SUBMITTER: O. E. Dillon, Border County Div. IAEI PROPOSAL: 18 Add the word "classified" in parenthesis after 13 Add the words "fastened in place and" after the "hazardous." ~pllance." SUBSTANTIATION: It is proposed that the word "classified", in SUBSTANTIATION: This section is practically unenforceable as parenthesis, be inserted after the word "hazardous." This is t-!~ere is no method of determining the rating of a portable ' consistent with Article 500, which is entitled "Hazardous appliance which may sometime in the future be plugged into a (Classified) Locations." The proposed wording recognizes that a receptacle. See the attached opinion* of the San Diego City location is not hazardous per se, but is classified depending on Attorney. the properties of the flammable or combustible substance which *See Border County Div. IAEI substantiation for proposal for may be present, and the likelihood that a flammable or 110-16(a). combustible concentration or quantity will be present. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: The supporting comment does not justify the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. proposed change. The present wording adequately reflects the Panel',s intent. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 424-3(b)(HOD 1978 NEC): Accept CMP 10 SUBMITTER: International Association of Electrical Inspectors 19 AmendSection 424-3(b), Paragraph 1, Sentence 1, 422-27: Reject CMP 10 to re--6~-6F: SUBMITTER: C. E. Muhleman, Marion, IN (b) Branch-Circuit Sizing. The size of branch-circuit PROPO~ 14 Revise as follows: conductors and overcurrent protective devices supplying fixed Overcurrent Protection. Each appliance of less than 15 electric space heating equipment consisting of resistance amperes load and each cord connected appliance shall have elements with or without a motor shall be computed on the basis overcurrent protection built into the appliance or its cord of 125-150 percent of the total load of the motors and the cap. Appliances having loads equal to or more than 15 amperes heaters. are not connected by cord, may be protected by an overcurrent SUBSTANTIATION: It should be recognized that 125 percent is device in a dedicated branch circuit. These overcurrent devices exacting and practically impossible to obtain. Guide lines were shall not exceed 150 percefit of the appliance load. The originally provided in Section 210-20(b) of the 1971NEC. requiraments in (a) thru (d)below, shall apply. However, this was deleted in the 1975 NEC. Under our present Delete present Ca) and (e). Reidentify remaining paragraphs requirement, Judgement could rule to pick something less than (b), (c), (d) and (f). 125 percent but close to it and no one can define "close." SUBSTANTIATION: This prevents small faults from not being Anything less than 125 percent may cause nuisance tripping. detected by a large overcurrent device and will reduce fires and "125-150 percent"Lwill provide the guide lines that are needed. damage to appliances. PANEL RECOMMENDATION: Accept as Revised: PANEL RECOMMENDATION: Reject. (b) Branch-Circuit Sizing. The ampacity of the branch-circuit 179 PANEL RECOMMENDATION: Accept as revised. PANEL COMMENT: The present wording adequately reflects the 422-15. Grounding. Appliancesrequired by Article 250 to be Panel's intent. grounded shall have exposed noncurrent-carrying metal parts VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. rounded in the manner specified in Article 250. ~FPN) See Sections 250-42, 250-43 and 250-45 for equipment grounding of refrigerators and freezers and Sections 250-57 and 250-60 for equipment grounding of electric ranges, wall-mounted 422-27(a): Accept CMP 10 ovens, counter-mounted cooking units, and clothes dryers. SUBMITTER: IdahoChapter, IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 15 Reword422-27(a) to include (f) which would then (a) Appliances shall be considered as protected against overcurrent if supplied by branch circuits as specified in (e) 422-16: Reject CMP 10 and (f) below and in Sections 422-5 and 422-6. SUBMITTER: International Association of Electrical Inspectors SUBSTANTIATION: No direct reference is made to requirements for 11 Revisethe first paragraph as follows: overcurrent protection of water heaters of larger types. By Grounding. The provisions of Article 250 apply to the including Part (f) in this section, specific requirements will grounding of appliances. be prescribed. (No change In the Exception and the remainder of the Section) PANEL RECOMMENDATION: Accept. SUBSTANTIATION: The present wording "Metal frames of VOTE ON PANEL RECOMMENDATION: electrically heated appliances operating on circuits over 150 AFFIRMATIVE: 10. volts to ground, shall be grounded in the manner specified in NEGATIVE: Jordan. Article 250" is misleading as the requirements of Section 250-42 EXPLANATION OF VOTE: are more stringent than those of Section 422-16. JORDAN: Section-422-27(2) gives requirements for protection The provisions of Section 90-3 do not provide means whereby of branch circuits. The (3) references given - "(e), 422-5 and requirements of Articles 250 and 422 can differ. The proposal 422-6" - are all requirements for branch circuit protection and is intended to eliminate, this inconsistency. not supplementary protection. There is enough confusion in the PANEL RECOMMENDATION: Reject. industry as it is, concerning the difference between PANEL COMMENT: CMP agrees with the intent of the Proposal. See "branch-circuit protection" and supplementary protection." action on Proposal No. IOA. Let's not promulgate the confusion. VOTE ON PANEL RECOI~(ENDATION:, Unanimously Affirmative.

424-2: Accept CMP 10 422-22(c): Reject CMP 10 SUBMITTER! Claude E. Deering, Jr., American Petroleum Institute SUBMITTER: O. E. Dillon, Border County Div. IAEI PROPOSAL: 18 Add the word "classified" in parenthesis after 13 Add the words "fastened in place and" after the "hazardous." ~pllance." SUBSTANTIATION: It is proposed that the word "classified", in SUBSTANTIATION: This section is practically unenforceable as parenthesis, be inserted after the word "hazardous." This is t-!~ere is no method of determining the rating of a portable ' consistent with Article 500, which is entitled "Hazardous appliance which may sometime in the future be plugged into a (Classified) Locations." The proposed wording recognizes that a receptacle. See the attached opinion* of the San Diego City location is not hazardous per se, but is classified depending on Attorney. the properties of the flammable or combustible substance which *See Border County Div. IAEI substantiation for proposal for may be present, and the likelihood that a flammable or 110-16(a). combustible concentration or quantity will be present. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: The supporting comment does not justify the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. proposed change. The present wording adequately reflects the Panel',s intent. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 424-3(b)(HOD 1978 NEC): Accept CMP 10 SUBMITTER: International Association of Electrical Inspectors 19 AmendSection 424-3(b), Paragraph 1, Sentence 1, 422-27: Reject CMP 10 to re--6~-6F: SUBMITTER: C. E. Muhleman, Marion, IN (b) Branch-Circuit Sizing. The size of branch-circuit PROPO~ 14 Revise as follows: conductors and overcurrent protective devices supplying fixed Overcurrent Protection. Each appliance of less than 15 electric space heating equipment consisting of resistance amperes load and each cord connected appliance shall have elements with or without a motor shall be computed on the basis overcurrent protection built into the appliance or its cord of 125-150 percent of the total load of the motors and the cap. Appliances having loads equal to or more than 15 amperes heaters. are not connected by cord, may be protected by an overcurrent SUBSTANTIATION: It should be recognized that 125 percent is device in a dedicated branch circuit. These overcurrent devices exacting and practically impossible to obtain. Guide lines were shall not exceed 150 percefit of the appliance load. The originally provided in Section 210-20(b) of the 1971NEC. requiraments in (a) thru (d)below, shall apply. However, this was deleted in the 1975 NEC. Under our present Delete present Ca) and (e). Reidentify remaining paragraphs requirement, Judgement could rule to pick something less than (b), (c), (d) and (f). 125 percent but close to it and no one can define "close." SUBSTANTIATION: This prevents small faults from not being Anything less than 125 percent may cause nuisance tripping. detected by a large overcurrent device and will reduce fires and "125-150 percent"Lwill provide the guide lines that are needed. damage to appliances. PANEL RECOMMENDATION: Accept as Revised: PANEL RECOMMENDATION: Reject. (b) Branch-Circuit Sizing. The ampacity of the branch-circuit 179 conductors and the rating or setting of overcurrent protective The wire manufacturers do not have a standard production of devices supplying fixed electric space heating equipment 2/0 and 3/0 cable required for the 30 kW and 35 kW and larger consisting of resistance elements with or without a motor shall space heaters. Most of the contractors have to special order not be less than 125 percent of the total load of the motors and this material. the heaters. The rating or setting of overcurrent protective The NEC should, as always, give the industry the method for a devices shall be permitted in accordance with Section 240-3, safe installation for the protection of the public, but let our Exception No. i. inspectors in charge determine the method. PANEL COMMENT: Reaffirm CMP 10 action for Proposal No. 30 (1978 PANEL RECOMMENDATION: Reject. Preprint) for the first sentence of the first paragraph of PANEL COMMENT: The present wording adequately reflects the Section 424-3(b). Panel's intent. VOTE ON PANEL RECOMMENDATION: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. AFFIRMATIVE: 10. NEGATIVE: Erickson. EXPLANATION OF VOTE: ERICKSON: Section 330-15 is specific on "maximum continuous 424-19(a)(2)c.: Reject CMP 10 capacities" for conductors. For thls Panel to add a derating SUBMITTER: Robert G.' MacManus, Pawtucket, RI factor of 80% is an unnecessary economic penalty. In some 22 Add a sentence as follows: instances the branch-circuitprotective device is required to be Where more than one controller is used to control one or derated because of other sections of the Code, and this will motors, as in the case of a thermostat, aquastat, summer-winter have some effect on conductor sizing, but that should not lead switch or time switch, a single disconnecting means shall be us to make an across-the-board derating of conductors. provided that will open the circuit to all controllers and also I can support this proposal if it is revised to read: be capable of being locked in the open position if not in sight (b) Branch Circuit-Sizing. The ampacity of the branch-circuit from the controller locations. conductors supplying fixed electric space heating equipment SUBSTANTIATION: Any of the above controllers may be the motor consisting of resistance elements and one or more motors shall controller at a given time and it would be impractical to be in accordance with Section 210-22(a). The ampacity of the install a disconnecting means in sight from each. A single branch-circuit conductors supplying fixed electric space heating lockable switch would prevent a hazard which now exists. equipment consisting of resistance elements only shall be in PANEL RECOMMENDATION: Reject. accordance with Section 310-15. The rating or setting of PANEL COMMENT: The present wording adequately reflects the overcurrent protective devices shall be in accordance with Panel's intent. Section 200-3, Exception No. i and Section 210-22(c) where VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. applicable.

424-14: Accept CMP 10 424-22(a) Exception-(New)(HOD 1978 NEC): CMP 10 SUBMITTER: O. E. Dillon, Border County Div. IAEI Reject 20 Delete the phrase "likely to become energized." SUBMITTER: J.A. Pietsch, General Electric Company ~IATION: The use of the words "likely to become PROPOSAL: 23 Add exception to Section 424-22(a) as follows: energized" renders this section unenforceable. See the attached ~ion: Where the branch-circuit, short-circuit and opinion* of the San Diego City Attorney. ground-fault protector is rated 60 amps or less and 250 volts 6r *See Border County Div. IAEI substantiation for CMP I Proposal less, either fuses or inverse time-type circuit breakers maybe No. 90 for 110-16(a). installed unless otherwise-limited by marking on the equipment PANEL RECOMMENDATION: Accept as Revised. nameplate. 424-14. Grounding. All exposed "noncurrent-carrying" metal SUBSTANTIATION: The intent of this proposal and a related parts of fixed electric space heating equipment likely to become proposal to change Section 440-22(b) is to permit the use of energized shall be grounded as required in Article 250. inverse time-type circuit breakers where appropriate on fixed VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Heating, Air Conditioning and Refrigeration Equipment branch circuits. Successful results with specific equipments approved as individual types or models for circuit breaker branch-circuit 424-19: Reject CMP 10 protection have shown that such devices do not constitute a SUBMITTER: T.H. Halton, Jr., Fort Worth, TX safety hazard. And, the circuit breakers permit improved 21 Revise as follows: protection to power utilization equipment by disconnecting "all" Disconnecting Means. Means shall be provided to ungrounded supply conductors s!multaneously. disconnect all fixed electric space heating equipment from all PANEL RECOMMENDATION: Reject. ungrounded conductors. Where heating equipment is supplied on PANEL COMMENT: CMP agrees with the intent of the Proposal see more than one source, the disconnecting means shall be grouped action on Proposal No. 24, Section 424-22(a). and identified. VOTE ON PANEL RECOMa4ENDATION: Unanimously Affirmative. (a) For fixed electric space heating equipment rated at not COMMENT ON VOTE: overdO0 vo!t-amperes or 1/8 horsepower, the branch-circuit JORDAN: My vote is to reject, as is the Panel's vote, but not overcurrent device may serve as the disconnecting means. for the same reason. See Proposal No. 24. (b) For fixed electric space heating equipment of greater rating, the branch-circuit switch or circuit breaker may, where readily accessible to the user of the equipment, serve as the disconnecting means. 424-22(a), Exception-(New): Accept CMP 10 (c) Motor Driven Heating Equipment. A switch or circuit Secretary's Note: It was the action of the Correlating breaker that serves as the disconnecting means for a Committee that this Proposal should be clarified as not applying motor-driven heater having a motor more than I/8 horsepower to motor operated equipment. Otherwise it is the responsibility shall be located within sight of the motor controller. of Panel 11. (d) Unit Switches as'Disconnecting Means. Unit switches with SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. a marked "Off" position, which are part of a fixed heater, that 24 Add Exception as follows: disconnect all ungrounded conductors may be used as the ~ion: Where the branch-circuit, short-circuit and disconnecting means required by the Article when other means for ground-fault protection is rated 60 amps or less and 250 volts disconnection are provided in the following types of occupancies: or less, and where the available fault current is 5000 amps or (i) Multifamily Dwellings. In multifamily (mo~e than two) less, either fuses or inverse tlme-type circuit breakers may be dwellings, the other disconnecting means shall be within the installed unless otherwise limited by marking on the equipment apartment, or on the same floor as the apartment in which the nameplate. fixed heater is installed, and may also control lamps and SUBSTANTIATION: The intent of this proposal and a related appliances. proposal to change 440-22(b) is to permit the use of (2) Two-Family Dwellings. In two-family dwellings, the inverse-time type circuit breakers where appropriate on fixed other disconnecting means may be located either inside or heating, air conditioning and refrigeration equipment branch outside of the apartment in which the fixed heater is installed. circuits. (3) Single-Family Dwellings. In single-family dwellings, A UL Fact-Finding Report dated November 1, 1976 was conducted the service disconnecting means may be the other disconnecting to investigate the suitability of inverse-time circuit breakers means. for these applications. (4) Other Occupancies. In other occupancies, the Unfortunately, close timing between issuance of the Report and branch-circuit switch or circuit breaker, where readily the final vote by the panel left little time for thorough study accessible to the user of the fixed heater, may be used for the for the 1978 Code. other disconnecting means. A careful review indicates that circuit breakers were totally SUBSTANTIATION: The members of Code Making Panel No. 10 have acceptable in 97% of the 387 tests summarized in the report. been working on this Section for some time, however this is an The remaining tests had minor discrepancies. example of trying to write a Code Section on how to install A field survey included in the report indicates that over 50% electrical work. The Code has always been a performance Code, of the defined units installed since 1971 are in fact protected not technical. by circuit breakers with no field problems. This proposal shall let the area inspector determine how to PANEL RECOMMENDATION: Accept as Revised: install electrical space heating. The utility companies are not Delete the word "may" and replace with "shall be permitted to." trying to require the methods for an installation of space heat now as they have in the past. 180 VOTE ON PANEL RECOMMENDATION: clearly. I personally believe that our Code should mainly staj, AFFIRMATIVE: 8. on the performance side. This change back to the original Code NEGATIVE: Casella, Hoeck, Jordan. will enable the Inspectors to perform their duties on a more EXPLANATION OF VOTE: equal and safer installation. CASELLA: This proposal would be acceptable if the wording PANEL RECOMMENDATION: Reject. "identified for group installation" were inserted after the PANEL COMMENT: The supporting comment does not Justify the present wording "inverse time type circuit breakers." proposed change. HOOCK: I have voted negative on this same Proposal and other VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. similar proposals in the past and feel that this issue should not be asked to be resolved by CMP 10. I believe this is a design problem and should be resolved between the testing agency and equipment manufacturers. 424-22(e): Accept CMP 10 JORDAN: Much rhetoric has been written on this subject, so I SUBMITTER: D. C. Rockholm, Underwriters Laboratories Inc. shall endeavor to confine my remarks to the bare minimum. This 27 Revise as follows: proposal is not new having been first made in a similar proposal ~onductors For Subdivided Loads. Field wired conductors by the same proposer for the 1968 NEC. between the heater and the supplementary overcurrent devices As I see this proposal, there is intent to circumvent the shall have the same ampacity as required for branch-circuit present Code requirements (namely-Section 430-53(c)(3)) which conductors in accordance with Section 424-3(b) based on the would allow circuit breakers for the proposed application, connected load. The supplementary overcurrent protective should these devices be "approved" for group installation. The devices specified in (c) above shall protect these conductors in NEC is not a testing agency and should not validate product accordance with Section 240-3. safety or mandate acceptance of a product that has not been able SUBSTANTIATION: The present wording of Section 424-22(e) to gain testing lab certification. apparently rules out the use of Exception No. I to Section It is my opinion that a nationally recognized testing lab should 240-3, which I do not believe was intended. Furthermore, the certify that this application is proper and safe and list Exception to 424-22(e) was apparently based on the Exception to and/label said equipment when submitted by the manufacturer. 424-22(d). It is my understanding that the basis for the The mechanics are already in the NEC. Why legislate performance exception to 424-22(d) is that on large heaters having by the NEC? individually controlled subdivided loads it is unlikely that all of these individual loads will be energized simultaneously for extended periods of time and therefore the conductors supplying the supplementary overcurrent protective devices would not be 424-22(b) and (c): Accept CMP '10 carrying the total heater current for extended periods. However, SUBMIITER: D. C. Rockholm, Underwriters Laboratories Inc. this logic is not applicable to the subdivided loads where it is / PROPOSAL: 25 Revise as follows: quite common for one or more such loads to be energized ~esistance Elements. Resistance-type heating elements in continuously in large heater (50 Kw or more). electric space heating equipment shall be protected at not more PANEL RECOMMENDATION: Accept as Revised: than 60 amperes. Equipment employing such elements rated more (el Conductors For Subdivided Loads. Field-wired conductors than 48 amperes shall have the heating elements subdivided, and between the heater and the supplementary overcurrent protective each subdivided load shall not exceed 48 amperes. devices shall be sized at not less than 125 percent of the load Exception: As provided in Section 424-72(a). servedt The supplementary overcurrent protective devices (c) Overcurrent Protective Devices. The supplementary specified in (c) shall protect these conductors in accordance overcurrent protective devices for the subdivided loads with Section 240-3. specified .... VOTE ON PANEL RECOMMENDATION: SUBSTANTIATION: The present wording of Section 424-22(b) does AFFIRMATIVE: 9. not place any limit on the size of overcurrent protecti6n of NEC~TIVE: Erickson. electric space heating equipment rated 48 amperes or less. I do EXPLANATION OF VOTE: not believe it was ever intended to allow such equipment to be ERICKSON: We are sizing conductors in this section and they protected with a larger size overcurrent protective device than do not have to be derated for continuous duty in accordance with permitted for an identical subdivided load of a large heater. Section 310-15. To continually oversize conductors is an The proposed rewording in Section 424-22(b) would correct ~his unnecessary economic penalty. See comments on Proposal No. 19. apparent oversight but would also require the addition of the words "for the subdivided loads" to 'Section 424-22(c) to define I can support this proposal if it is reworded to ~ead: the overcurrent protective devices referenced in this Section. (el Conductors for Subdivided Loads. Field wired conductors PANEL RECOMMENDATION: Accept as Revised. between the heating elements and supplementary overcurrent Add a paragraph to the end of (b) as follows: protective devices shall be sized in accordance with Section Where a subdivided load is less than 48 amperes, the rating of 310-15 and shall be protected by the supplementary overcurrent the overcurrent protective device shall comply with Section protective devices in accordance with Section 240-3, Exception 424-3(b). No. 1. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

424-34, Exception-(New): Accept CMP 10 424-22(c): Reject CMP 10 SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. SUBMITTER: T.H. Halton, Jr. 28 Add an exception as follows: 26 Wording to be deleted. -~-eption: Panels approved for the purpose shall be permitted ~ded Text: Delete paragraph (c) Overcurrent PrOtection with shorter leads. Devices. i SUBSTANTIATION: The present wording does not allow for the SUBSTANTIATION: This is a cempanion proposal to clarify the installation of heating panels approved for the purpose using recommendation for the proposal on 424-19. wiring systems other than 7 foot nonheating leads. The addition In the Tarrant County area of Texas we have had complaints by of this exception will correct this. the homeowner trying to replace the fuses and of being shocked. PANEL RECOMMENDATION: Accept as Revised: All of their cemplaints were checked and all units were wired Exception: Heating panels identified for direct field according to N.E.C. including the marking on the units with connections to the nonheating leads using junction assemblies. notices to disconnect unit before removing any doors. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. The homeowner tries to replace these fuses because he has called in the repairman to fix his furnace and the repairman does not always disconnect the unit, he will pull the fuses and check them. If he finds one blown he replaces said fuse and 424-35 (a): Accept CMP 10 sends a bill for or collects for the call. The next time the SUBMITTER: TSC-Nominal Voltage unit quits, the homeowner goes by the nearest store and will PROPOSAL: 29 The second sentence should be revised to read: purchase enough fuses to replace all fuses in furnace. He wire shall have the following color identification to attempts to put in new fuses and not being equipped, nor knowing indicate the circuit voltage on which it is to be used, etc. what he is doing, will be shocked. The public will try to do SUBSTANTIATION: To conform to the method to express circuit anything to save money. The fuses in the units are a hazard to voltage as per guidelines developed by the TSC on nominal the public and service men. voltage. The proposed change in Article 424-19 will enable the PANEL RECOMMENDATION: Accept. electrical inspector to have installed a sub-panel in the heater VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. closet and connect the electric furnace from that panel. The heating unit manufacturers are making their units over 20 kW with one feed and two feed connections. This creates a problem for the installer. He installs for two feeds and on the 424-41(e): Accept CMP 10 final finds a one feed. The larger units requiring 30 kW and 35 SUBMITTER: TSC-Approved for the Purpose kW feeds create problems with the 2/0 and 3/o cable as no 30 See the Technical Subcommittee "Recommendations" manufacturer of cable has a standard production of this size under the definiton of "Approved for the Purpose" in Article 100. cable. SUBSTANTIATION: See the TSC "findings" under the definition of This Section of the N.E.C. as it is presently in the Code, is "Approved for the Purpose" in Article 100. another example of writing a technical Code. No reflection on our wonderful Code Panels, they work so hard to write the Code 181 PANEL RECOMMENDATION: Accept as Revised: 424-60: Accept CMP 10 Delete the phrase "approved for the purpose" and replace with SUBMITTER: TSC-Approved for the Purpose "identified as suitable for this use." PROPOSAL: 34 See the Technical Subcommittee "Recommendations" VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. un--6-d-e-r-~e definition of "Approved for the Purpose" in Article 100. SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article 100. 424-41(f), Exception: Accept CMP 10 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose Delete the words "approved for the purpose and so marked" and 31 See the Technical Subcommittee "Recommendations" replace with "identified as suitable for use at the elevated ~e definition of "Approved for the Purpose" in Article temperatures." 100. Delete the paranthetical phrase "(such as heat pumps)." SUBSTANTIATION: See the TSC "findings" under the definition of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmatfve. "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: Exception: Cables identified to be secured at intervals not to exceed 6 feet. 424-65: Reject CMP 10 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: R. S. Pinkerton, Los Angeles, CA 35 Add the word "safely" before the word "accessible." SUBSTANTIATION: Duct heater controllers are being installed in 424-44(e): Accept CMP 10 locations which have the proper workspace but are impossible to SUBMITTER: H.F. van der Voort, Cleveland, OH "reach for routine maintenance without subjecting the workman to ]~TOI~'AI~T.. 32 Add "rigid nonmetallic conduit" after serious risks of tripping and failing. The present Code ~diate metal conduit" and "electrical metallic tubing." requirements provide for a safe workspace about equipment but do SUBSTANTIATION: The rigid nonmetallic conduit for this not provide for a safe passageway to the workspace. application is Schedule 40 PVC and has excellent mechanical PANEL RECOt~NIENDATION: Reject. strength; both crush and impact. This strength is equivalent to PANEL COMMENT: The supporting comment does not justify the that of EMT and the proposed wording indicates this. Unless proposed change. The present wording adequately reflects the severe physical damage is imminent, protection of the conduit is Panel's intent. unnecessary. Carlon tested both Schedule 40 and EMT in its own VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. research facilities to demonstrate this. The test methods are those calIed for in UL651. The test results are shown on the following table. 424-65: Reject CMP 10 SUBMITTER: SouthwesternSection IAEI I~ACT RESISTANCE MEAS~EMENTS ON PVC SCHEDULE 40 PROPOSAL: 36 Add the word "safely" in front of "accessible" to CONDUIT & EbECTRICAL METALLIC TUBING read: Duct heater controller equipment shall be safely accessible with the disconnecting means installed at or within, Percent Decrease in Inside Diameter site from the controller. SUBSTANTIATION: Duct heater controllers are being installed in DIAMETER @VC SCHEDULE 40 EMT locations which have the proper workspace but are impossible to Inches Min. Max. Min. Max. reach for routine maintenance without subjecting the workman to serious risks of tripping and falling. The present Code 1/2 4.7 7.2 18.2 25.1 requirements provide for a safe workspace about equipment but do 3/4 4.9 6.9 22.6 25.9 not provide for a safe passageway to the workspace. 1 5.5 5.7 30.0 32.9 PANEL RECOMMENDATION: Reject. I-1/4 4.6 4.8 26.6 27.8 PANEL COMMENT: The supporting comment does not justify the 1-1/2 4.7 5.5 43.6 45.1 proposed change. The present wording adequately reflects the 2 2.1 2.8 55.1 56.6 Panel's intent. 3 2.5 3.0 53.6 56.0 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 4 2.0 2.0 45.1 46.6

Crushload in Pounds to Achieve 424-71: Accept CMP 10 SUBMITTER: TSC-Approved for the Purpose 30% Deflection ~37 See the Technical Subcommittee "Recommendations o--~oved for the Purpose" in Article 100. SUBSTANTIATION: See the TSC "findings" under the definition of DIAMETER PVC SCHEDULE 40 EMT "Approved for the Purpose" in Article 100. Inches Min. Max. Min. Max. PANEL RECOMMENDATION: Accept as Revised: 424-71. Identification. Resistance-type boilers shall be 1/2 2265 2345 2565 2800 identified as suitable for the installation. 3/4 1878 1910 2100 2160 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I 1876 2010 2250 2365 1-I/4 1494 1580 2750 2950 1-1/2 1880 1892 1730 1764 2 1208 1276 1280 1296 424-72(a), (b), and (c): Accept CMP 10 3 1676 1688 ,880 957 SUBMITTER: D. C. Rockholm, Underwriters Laboratories Inc. 4 1280 1570 785 798 PI~-O]~'~-~." 38 Revise as follows: --~ boiler employing reslstance-type immersion heating elements contained in an ASME rated and stamped vessel shall PANEL RECOMMENDATION: 'Accept. have the heating elements protected at not more than 150 VOTE ON PANEL RECOMMENDATION: amperes. Such a boiler rated more than 120 amperes shall have AFFIRMATIVE: 10. the heating elements subdivided into loads not exceeding 120 NEGATIVE: Erickson. amperes. EXPLANATION OF VOTE: (b) A boiler employing resistance-type heating elements not ERICKSOH: No co~Inent received. contained in an ASME rated and stamped vessel, shall have the heating elements protected'at not more than 60 amperes. Such a boiler rated more than 48 amperes will have the heating'elements subdivided into loads not exceeding 48 amperes. 424-58: Accept CMP 10 (c) The supplementary overcurrent protective devices for the SUBMITTER: TSC-Approved for the Purpose subdivided loads as required by .... 33 See the Technical Subcommittee "Recommendations" SUBSTANTIATION: The present wording of Section 424-72(b) does ~e definition of "Approved for the Purpose" in Article not place any limit on the size of overcurrent protection of 100. resistance type immersion heating elements in boilers rated 48 SUBSTANTIATION: See the TSC "findings" under the definition of amperes or less when the elements are not contained in an ASME "Approved for the Purpose" in Article 100. rated and stamped vessel. I do not believe it was ever intended i PANEL RECOMMENDATION: Accept as Revised: tO a11ow such elements to be protected with a larger size 424-58. Identification. Heaters installed in an air duct shall overcurrent protective device than permitted for an identical be identified as suitable for the installation. subdivided load of a larger boiler. The proposed rewording of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 424-72(b) is intended to correct this apparent oversight. The proposed rewording to 424-72(a) is for clarification and consistency with 424-72(b). The proposed rewording in Section 424-72(a) and (b) would also require the addition of the words "for the subdivided loads" to Section 424-72(c) to define the overcurrent protective devices referenced in this section.

182 PANEL RECOI~ENDATION: Accept as Revised: through the pressure vessel shell. In the second sentence of (b) change ~will" to "sh~ll." And, As indicated on the sketch, the halar coated heads and the also add a paragraph to (a) as follows: polysulfone shield act to form an electrically isolated chamber Where a subdivided load is less than 120 amperes, the rating for the electrode assembly. The PPS bushing insulates the of the overcurrent protective device shall comply with Section entire electrode assembly from the steel pressure vessel. 424-3(b). The electrically "hot u electrodes are isolated from the Add a paragraph to (b) as follows: support shaft and rotating shaft by ceramic arms supported by Where a subdivided Ibad is less than 48 amperes, the rating of polysulfone discs. The rotating shaft if further isolated by the overcurrent protective device shall comply with Section encapsulation in teflon tubing. A top guard of perforated metal 424-3(b). enclosing the exposed components prevents personnel from VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. contacting any portion of the assembly. Since the electrode assenfoly is insulated from the inside of the tank, it is not necessary to bring the neutral from the supply to the boiler. However, we do connect the electrode assembly structure to 424-72(e): Accept CMP 10 neutral to prevent any possible personnel hazard. The outer SUBMITTER: D. C. Rockholm, Underwriters Laboratories Inc. enclosure is locally grounded. ]~TOPO~'7~-~. 39 Revise as follows: It is understood that the Electrode Boiler has met the .S amp ~onductors for Subdivided Loads. Field-wired conductors maximum ground current tests as specified by the Underwriters between the heater and the supplementary overcurrent devices Laboratories, Inc. The proposed recommended text attempts to shall have the same ampacity as required for branch-circuit address the above problem. conductors in accordance with Section 424-3(b) based on the PANEL RECO~4ENDATION: Accept. connected load. The supplementary overcurrent protective VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. devices specified in(c) above shall protect these conductors in accordance with Section 240-3. SUBSTANTIATION: The present wording of Section 424-72(e) apparently rules out the use of Exception No. 1 to Section ARTICLE 426 -- FIXED OUTDOOR ELECTRIC DE-ICING AND 240-3, which I do not believe was intended. Furthermore the SNOW MELTING'EQUIPMENT Exception to 424-72(e) was apparently based on the Exception to 424-72(d). It is my understanding that the basis for the 426-3 Exception-(New)(HOD 1978 NEC): Reject CMP 10 exception to 424-72(d) is that on large heaters having SUBMITTER: Pipeline Heating Systems, Inc., Brecksville, OH individually controlled subdivided loads it is unlikely that all ~43 Add at end of paragraph: of these individual loads will be energized simultaneously for ~ion: Skin effect current tracing circuits. See Section extended periods of tlme and therefore the conductors supplying 426-34. the supplementary overcurrent protective devices would not be SUBSTANTIATION: Same as Proposal No. 57 to 1978 preprint. carrying the total heater current for extended periods. PANEL RECOMMENDATION: Reject. However, this logic is not applicable to the subdivided loads PANEL COMMENT: CMP agrees with intent of proposal. See action where it is quite common for one or more such loads to be on Proposal No. 46. energized continuously in a large heater (50 Kw or more). VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised: (e) Conductors for Subdivided Loads. Field-wired conductors between the heater and the supplementary overcurrent protective devices shall be sized at not less than 125 percent of the load "426-23: Reject CMP 10 served. The supplementary overcurrent protective devices , SUBMITTER: TSC-Approved for the Purpose specified in (c) shall protect these conductors in accordance ~44 See the Technical Subcommittee "Recommendations" with Section 240-3. un-'n-de-~'-t-~e definition of "Approved for the purposeu in Article VOTE ON PANEL RECOMMENDATION: 100. AFFIRMATIVE: 10. SUBSTANTIATION: See the TSC "findings" under the definition of NEGATIVE: Erickson. "Approved/for the Purpose" in Article 100. EXPLANATION OF VOTE: PANEL RECOMMENDATION: Reject. ERICKSON: No comment received. PANEL COMMENT: See CMP action on Proposal No. 46.

• VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: ERICKSON: I feel that Panel Comment should be changed to "CMP 424-80: Accept CMP 10 agrees with intent of Proposal." See action on Proposal No. 46. SUBMITTER: TSC-Nominal Voltage ]I~-OPI~I~-L'~." 40 Add "nominal~ after the word "volts" in second 426-23: Reject CMP 10 SUBSTANTIATION: To conform to the method to express system SUBMITTER: Warren H. Cook, IEEE voltage as developed by the TSC on nominal voltage. ~45 Revisefirst sentence to read: PANEL RECOMMENDATION: Accept. ~supply nonheating leads (cold leads) for the electric VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. beating elements shall be suitable for the temperature encountered. SUBSTANTIATION: Present wording allows for only factory assembled units. Currently approved equipment is available 424-81: Accept CMP 10 which utilizes field fabrication on nonheatlng leads. SUBMITTER: TSC-Approved for the Purpose PANEL RECOMMENDATION: Reject. PROPOSAL: 41 See the Technical SubCommittee "Recommendations" PANEL COMMENT: See action on Proposal No. 46. un-G~-a-e~'-]~e definition of "Approved for the l)urpose" in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. COMMENT ON VOTE: SUBSTANTIATION: See the TSC "findings" under the definition of ERICKSON: Sameas for Proposal No. 44. ' "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: 424-81. Identification. Electrode-type boilers shall be 426 Part O-(New)(HOD 1978 NEC): Accept CMP 10 identified as suitable for the installation. Secretary's Note: It was the action of the Correlating VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Committee that further consideration be given to the comments expressed in the voting. SUBMITTER: Pipeline Heating Systems, Inc., Brecksville, OH 46 Add a new Part D to Article 426 as follows: 424-85: Accept CMP 10 D. Skin Effect Current Tracing SUBMI1-TER: Kenneth W. Cohen, Aerco International, Inc. 426-30. Scope. The provisions of Part D of thls article shall 42 Revise as follows: apply to fixed outdoor electric de-icing or snow melting ~ose boilers designed such that fault currents do not equipment utilizing a tubular resistive heating element of pass through the presssure vessel and the pressure vessel is ferromagnetic material and having within the tubular element an electrically isolated from the electrodes, all exposed electrically insulated return conductor so arranged that the noncurrent carrying metal parts including the pressure vessel, skin effect of alternating current causes the main heating supply and return connecting piping shall be grounded in current to concentrate near the inner wall of the tubular accordance with Article 250. element. For all other designs the pressure vessel containing the 426-31. Insulating Rating. electrodes shall be-isolated and electrically insulated fr~n (a) The electrical insulation of the inner conductor shall ground. have a temperature rating greater than the operating temperature SUBSTANTIATION: Aerco International, Inc. presently of the cable for the specific system based on the designs and manufactures an electrode Hot Water Boiler that is U.L. listed tests of the manufacturer. (U.L. File #E-39417) (b) The electrical insulation of the inner conductor shall I have enclosed a pictoral representation of same. have a voltage rating at any point on the system higher than the We believe the grounding requirement, Para. 424-85 of the 1978 operating voltage at that point. NEC is designed to cover those boilers where fault currents can (c) The outer conductor (tubular element) shall not require flow to neutral. However, the code '~oes not specifically electrical insulation provided its outer surface is effectively address our design, where fault currents cannot flow to ground grounded at one or more locations. • 183 426-32. Single Cable. A single cable may be used as the wiring, leads, temperature controllers, safety signs, junction internal return conductor if the provisions of Section 426-31(a) boxes, raceways and fittings. are met. Resistance Heating Element. A specific separate element to 426-33. Pull Boxes. Pull boxes for the inner cable shall be generate heat which is embedded in or fastened to the surface to accessible without excavation by being placed in suitable vaults be heated. or on above grade structure. (FPN) Tubular heaters, strip heaters, heating cable, heating 426-34. Branch-Circuit Requirements. The branch-circuit tape, heating panels, are examples of resistance heaters. supplying a skin effect current tracing system shall not be Impedance Heating System. A system in which heat is generated limited in current rating by Section 426-3, but shall meet all in a pipe or rod, or combination of pipes and rods, by causing other applicable branch-circuit requirements of this Code. current to flow through the pipe or rod by direct connection to 426-35. AboveGround Installations. Skin effect current an ac voltage source from a dual-winding transformer, The pipe tracing systems may be installed in exposed locations, such as or rod shall be permitted to be embedded in the surface to be on substation and bridge structures to prevent failing ice heated, or constitute the exposed components to be heated. provided t~e heating element is grounded at the power feed Skin Effect Heating System. A system in which heat is location ahd at the termination of the circuit. generated on the inner surface of a ferromagnetic envelope SUBSTANTIATION: Skin effect current tracing has been used with embedded in or fastened to the surface to be heated. great success in Japan for snow melting on garage ramps, airport (FPN) Typically, an electrically insulated conductor is aprons, and electrical substation structures. The principle of routed through and connected to the envelope at the other end. operation is explained in literature attached to our proposed The envelope and the electrically insulated conductor are amendment to Article 427. connected to an ac voltage source from a dual-winding This method is especially suitable for heating concrete slabs transformer. because the heavy wall steel 'heating elements has the same 426-3. Application of Other Articles. All requirements of this noncorroding characteristic in concrete that steel reinforcing Code shall apply except as specifically amended in this rod has and is also of adequate strength to be unaffected by article. Fixed outdoor electric de-icing and snow-melting shrinkage or settlement of cracks. It hasthe unique advantage equipment for use in hazardous (classified) locations shal~ that the inner cable can be replaced and full function restored comply with Articles 500 through 516. without breaking up the slab if any maintenance problem ever 426-4. Branch-Circuit Requirements. The ampacity of occurs. The main heating element, being of fully welded heavy branch-circuit conductors and size of overcurrent protective wall construction, is not subject to failure in service unless devices supplying fixed outdoor electric de-iclng and there is catastrophic breakage of the slab. The thermal and snow-melting equipment shall be calculated on the basis of 125 electrical characteristics of the system are such that several peEcent of the total load of the heaters. Fixed outdoor thousand square feet can be heated with 100 watts per square electric de-icing and snow-melting installations shall be foot frem a single circuit. permitted to be supplied by 15-, 20-, 25-, 30-, 40-, or A skin effect current tracing heat element, having roughly the 50-ampere circuits if the circuit suppliesno other load. same dimensions as rigid conduit, can be installed without Exception: An individual branch ciKcuit shall be permitted to mechanical protection in exposed locations and can be useful for supply any load to a single heating unit. the accumulation of ice build up above transformer bushings, walkways, or other places troubled by falling ice. B. Installation The purpose of each amended paragraph is explained here: 426-31(a). In most cases it is possible to operate code rated 426-10. General. Equipment for outdoor electric de-icing and cables at higher currents in skin effect heating systems than snow melting shill be identified as being suitable for: permitted by Table 310-16 without exceeding the temperature l)I the chemical, thermal and physical environment; and rating of the cable as given in Table 310-16. Normal code installation in accordance with the manufacturer's ampacity is based on three conductors in a conduit and with the drawings and instructions. thought that heat loss from the conduit might by limited by 426-11. Use. Electrical heating equipment shall be installed enclosure within an insulated stud wall, for example. In a skin in such a manner as to be afforded protection from physical effect tracing syste~l, one cable, not three, is producing heat. damage. More importantly, the temperature of the raceway is known and 426-12..Thermal Protection. External surfaces of outdoor bears a definite relationship to the pipeline temperature and electric de-lcing and snow-melting equipment which operate at the overall thermal parameters of the system. Since cable surface temperatures"exceedihg 60°C (140°F) shall be physically . temperature and not current is the true basis of any rating, it guarded, isolated, or thermally insulated to protect against is possible to design with higher currents when all facts are contact by personnel in the area. known; a wide margin for error is thus unnecessary. 426-13. Identification. The presence of outdoor electric 426-31(c). Section 310-2 states "Conductors shall be de-icing and snow-melting equipment shall be evident by the insulated." The heat tube of a skin effect system is in truth posting of appropriate caution signs or markings where clearly insulated by electremagnetic properties; under normal or Yault visible. conditions the outer surface is always isolated (insulated) from 426-14. Special Permission. Fixed outdoor de-lcing and the circuit voltage. But in every other application the Code snow-melting equipment employing methods of construction or thinks in terms of circuit theory rather than wave theory. In installation other than covered by this article may be used only order to avoid possible misunderstandings, this paragraph is by special permission. included. The presence of a ground assures the absence of voltage. There are technical approaches to this specific C. Resistance Heating Elements situation that are somewhat more definitive, but are felt inappropriate fdr the NEC. 426-20. Embedded De-icing and Snow-Melting Equipment. 426-32. Section 300-20 requires that "all phase wires be (a) Watt Density. Panels or units shall not exceed 120 watts grouped" when in a metal raceway "to avoid heating the per square foot of heated area. surrounding metal by induction." The usual situation this (b) Spacing. The spacing between adjacent cable runs is . section prohibits is obviously hazardous, for very high dependent upon the rating of the cable, and shall be not less uncontrolled temperatures are possible. A skin effect tracing than one inch on centers. system requires a single conductor in a metal tube specifically (c) Cover. Units, panels or cables shall be Installed: to create heat in the tube; although not strictly by induction. (I) On a substantial asphalt or masonry base at least 2 This is permissible because the temperature of the system in inches thick and have at least I-1/2 inches of asphalt or known, and is part of the design. masonry applied over the units, panels or cables; or 426-33. Self explanatory. (2) They shall be permitted to be installed over other 426-34. Self explanatory. approved bases and embedded within 3-I/2 inches of masonry or 426-35. Skin effect current tracing heat elements are always of 'asphalt but not less than 1-1/2 inches from the top surface; or steel and typically are from 3/4 inch to 2 inches in O.D. and (3) Equipment that has been specially investigated for other with a wall thickness greater than 0.100 inches~ They thus do forms of installation shall be installed only in the manner for not require protection from mechanical abuse in most instances. which it has been investigated. A single ground will assure that no potential can occur on the (d) Secured. Cables, units and panels shall be secured in heating element under normal or fault conditions; a second place by frames or spreaders or other approved means while the round is simply a conservative redundancy. masonry or asphalt finish is applied. ~ANEL RECOMMENDATION: Accept as Revised. (e) Expansion and Contraction. Cables, units, and panels shall not be installed where they bridge expansion Joints unless ARTICLE 426-FIXED OUTDOOR ELECTRIC DE-ICING adequately protected from expansion and contraction. AND SNOW-MELTING EQUIPMENT 426-21. Exposed De-Icing and Snow-Melting Equipment. - (a) Secured. Heating element assemblies shall be secured to A. General surface being heated by approved means. th~b)' Overtemperature. Wherethe heating element is not in 426-I. Scope. The requirements of this article shall apply to direct contact with the surface being heated, the design of the electrically energized heating systems and the installation of heater assembly shall be such that its te~q~erature limitations these systems; shall not be exceeded. (a) Embedded in driveways, walks, steps and other areas. (c) Expansion and Contraction. Heating elements and (b) Exposed on drainage systems, bridge structures, roofs and assemblies shall not be Installed where they bridge expansion other structures. joints unless provision is made for expansion and contraction. 426-2. Definitions. For the purpose of this article: (d) Flexural Capability. Where installed on flexible Heating System. A complete system consisting of components structureS, the heating elements and assemblies shall have a such as heating elements, fastening devices, nonheating circuit flexural capability compatible with the structure. 184 426-22. Installation of Nonheating Leads for Embedded Equipment. or nonferrous metal raceways, boxes, fittings, supports and (a) Grounding Sheath or Braid. Nonheating leads having a support hardware shall be permitted to be installed in concrete grounding sheath or braid shall be permitted to be embedded in or in direct contact with the earth, or in areas subjected to the masonry or asphalt in the same manner as the heating cable 'severe corrosive influences, where made of material sultable for without additional mechanical protection. the condition, or where provided with corrosion protection (b) Raceways. All but one to 6 inches of nonheating leads of identified as suitable for the condition. Corrosion protection Type TW and other approved types not having a ground!ng sheath shall maintain the original wall thickness of the ferromagnetic shall be enclosed in a rigid conduit, electrical metallic envelope. tubing~ intermediate metal conduit, or other raceways within 426-44. Grounding. The ferromagnetic envelope shall be asphalt or masonry; and the distance from the factorysplice to grounded at both ends; and, in addition, it shall be permitted raceway shall be not less than one inch or more than 6 inches. to be grounded at intermediate points as required by its design. (c) Bushings. Insulating bushings shall be used in the The provisions of Section 250-26 shall not apply to the asphalt or masonry where leads enter conduit or tubing. installation of skin effect heating systems. (d) Expansion and Contraction. Leads shall be protected in (FPN) See Section 250-26(d). expansion Joints and where they emerge from masonry or asphalt F. Control and Protection by rigid conduit, electrical metallic tubing, intermediate metal conduit, other raceways, or other approved means. 426-50. Disconnecting Means. All fixed outdoor de-icing and (el Leads in Junction Boxes. Not less than 6 inches of free snow-melting equipment shall be provided with a means for nonheating lead shall be within the junction box. disconnection from all ungrounded conductors. Where readily 426-23. Installation of Nonheating Leads for Exposed Equipment. accessible to the user of the equipment, the branch-circuit (a) Nonheating Leads. Power supply nonheating leads (cold switch or circuit breaker shall be permitted to serve as the leads) for resistance elements shall be suitable for the disconnecting means. Switches used as the disconnecting means temperature encountered. Preassembled nonheating leads on shall be of,the indicating type. approved heaters shall be permitted to be shortened if the 426-51. Controllers. markings specified in Section 426-25 are retained. Not less (a) Temperature Controller With "Off" Position. Temperature than 6 inches of nonheating leads shall be provided within the controlled switching devices which indicate an "off" position junction box. and which interrupt line current shall open all ungrounded (b) Protection. Nonheating power supply leads shall be conductors when the control device is in.the "off" position. enclosed in a rigid conduit, intermediate metal conduit, These devices shall not be permitted to serve as the electrical metellic tubing, or other approved means. disconnecting means unless provided with a positive lockout in 426-24. Electrical Connection. the "off" position. (a) Heating Element Connections. Electrical connections, (b) Temperature Controller Without "Off" Position. other than factory connections of heating elements to nonheating Temperature controlled switching devices which do not have an elements embedded in masonry or asphalt or on exposed surfaces, "off" position shall not be required t6 open all ungrounded shall be made with insulated connectors identified for the use. conductors and shall not be permitted to serve as the (b) Circuit Connections. Splices and terminations at the end disconnecting means. of the nonheating leads, other than the heating element end, (c) Remote Temperature Controller. Remote controlled shall be installed in a box or fitting i6 accordance with temperature actuated devices shall not be required to meet the Sections 110-14 and 300-15. requirements of Section 426-51(a). These devices shall not be 426-25. Marking. Each factory-assembled heating unit shall be permitted to serve as the disconnecting means. legibly marked within 3 inches of each end of the nonheating (d) Combined Switching Devices. Switching devices consisting leads with the permanent identification symbol, catalog number, of combined temperature actuated devices and manually controlled and ratings in volts and watts, or in volts and amperes. switches which serve both as the controller and the 426-26. Corrosion Protection. Ferrous or nonferrous metal disconnecting means shall comply with all of the following raceways, cable armor, cable sheaths, boxes, fittings, supports conditions: and support hardware shall be permitted to be installed in (1) Open all ungrounded conductors when manually placed in concrete or in direct contact with the earth, or in areas the "off" position; and subject to severe corrosive influences, when made of material (2) be "so designed that the circuit cannot be energized suitable for the condition, or when provided with corrosion automatically if the device has been manually placed in the protection identified as suitable for the condition. "off" position; and 426-27. Grounding. (3) be provided with a positive lockout in the "off" (a) Metal Parts. Exposed noncurrent-carrying metal parts of position. 426-52. Overcurrent Protection. Fixed outdoor electric equipment likely to become energized shall be grounded as b required in Article 250. de-icing and snow-melting equipment shall be considered as (b) Grounding Braid or Sheath. Grounding mebns, such as protected against overcurrent where supplied by one of the copper braid, metal sheath, or other approved means, shall be branch circuits as specified in Section 426-4. provided as part of the heated section of the cable, panel, or PANEL C(}~MENT: Article 426 has been completely revised and unit. augmented by CMP 10. CMP 10 feels that these revisions improve (c) Bonding and Grounding. All noncurrent-carrying metal 'and clarify present Article 426 and incorporates the intent of parts that are likely to become energized shall be bonded this proposal. together and connected to an equipment grounding conductor sized VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in accordance with Table 250-95, extending to the distribution COMMENT ON VOTE: panelb~ard. ERICKSON: Although I agree with the panel action on this D. Impedance Heating proposal I would like to comment on certain sections.

426-30. Personnel Protection. Exposed elements of impedance Section 426-4: Change first sentence to read "The ampacity of heating systems shall be physically guarded, isolated, or branch-circuit, conductors supplying fixed outdoor electric thermally insulated with weatherproof jacket to protect against de-icing and snow-melting equipment shall be in accordance with contact by personnel in the area. Section 310-15. The rating or setting of overcurrent protective 426-31. Voltage Limitations. The impedance heated elements devices shall be in accordance with Section 240-3, Exception No. shall not operate at a voltage greater than 30 volts ac. I and Section 210-22(c) where applicable. See Explanation for Exception: The voltage shall be permitted to be greater than Vote on Proposal No. 19. 30 volts, but not more than 80 volts, if a ground-fault circuit-interrupter for personnel protection is provided. Section 426-31, Exception: The use of the Words "for personnel 426-32. Isolation Transformer. A dual-winding transformer with protection" although not defined by the NEC, may imply to a grounded shield between the primary and secondary windings inspectors a 5 n~ device. These devices would be inoperative on shall be used to isolate the distribution system from the an impedance heating circuit since there is more leakage current heating system. than 5 mA. What is intended is a GFCI as defined by the NEC 426-33. Induced Currents/ All current-carrying components which would operate at a lower current to ground than the shall be installed in accordance with Section 300-20. circuit protective device. I recommend those words be deleted. 426-34. ~Grounding. An impedance,heating system that is See Section 680-41(a) for a precedent. operating at a voltage greater than 30, but not more than 80, JORDAN: The following co~mnents are editorial: shall be grounded at designated point(s). i. It is suggested that the first sentence of Section 426-4 be revised to conform with Proposal No. 19 to assure consistency. E. Skin Effect Heating 2. In Section 426-10(2): Change the word "installation" to ',,installed. u 426-40. Conductor Ampacity. The ampacity of the electrically 3. InSection 426-12: Third line; delete word "surface," which insulated conductor inside the ferromagnetic envelope shall be is redundant. permitted to exceed the values shown in. Article 310, provided it 4. In Section 426-14: In 3rd line change "may" to "shall." is identified as suitable for this use. 5. In Section 426-22(a): Last line; change word "mechanical" 426-41. Pull Boxes. Where pull boxes are used they shall be to "physical," to conform to code nomenclature. accessible without excavation by location in suitable vaults or 6. The word "approved" is used 5 or 6 times and should be above grade. Outdoor pull boxes shall be of watertight scrutinized to assure conformance with the technical sub- construction. committee's findings on "approved for the purpose:" 426-42. Single Conductor in Enclosure." The provisions of Section 300-20 shall not apply to the installation of a single conductor in a ferromagnetic envelope (metal enclosure). 426-43. Corrosion Protection. Ferremagnetic envelopes, ferrous 185 ARTICLE 427 -- FIXED ELECTRIC HEATING EQUIPMENT FOR (d) Flexural Capability. Where installed on flexible PIPELINES AND VESSELS pipelines, the heating elements and assemblies shall have a flexural capability compatible with the pipeline. Article 427: Accept CMP 10 (el Power Supply Leads• Power supply nonbeating leads (cold Secretary's Note: It was the action of the Correlating leads) for resistance elements shall be suitable for the Conwnittee that further consideration be given to the comments temperature encountered. Preassembled nonheating leads on expressed in the voting. approved heaters may be shortened if the markings specified in SUBMITTER: TSC-Skin Effect Current Tracing Section 427-24 are retained. Not less than 6 inches of 47 Revise as follows: nonheating leads shall be provided with the junction box. ARTICLE 427-F.IXED ELECTRIC HEATING EQUIPMENT FOR (f) Power Supply Leads Protection. Nonheating power supply PIPELINES AND VESSELS leads shall be protected where they emerge from electrically heated pipeline or vessel heating units by raceway• A. General (g) Interconnecting Leads. Interconnecting nonheating leads connecting portions of the heatlng system shall be permitted to 427-I. Scope. The requirements of this article shall apply to be covered by thermal insulation'in the same manner as the electrically energized heating systems and the installation of heaters. these systems used with pipeline and/or vessels. 427-15. ImpedanceHeating. 427-2. Definitions. For the purpose of this article: (a) Personnel Protection. All accessible external surfaces (a) Pipeline: A pipeline is a length of pipe including pumps, of the pipeline and vessel being heated shall be physically valves, flanges, control devices, strainers and/or similar guarded, isolated, or thermally insulated (with weatherproof equip~nt for conveying fluids. jacket for outside installations) to protect against contact by (b) Vessel: A vessel is a container such as a barrel, drum or personnel in the area. tank for holding fluids or other material. (b) VoltageLimitations. The pipeline or vessel being heated (c) Integrated Heating System: An integrated heating system and electrical connections to it shall not operate at a voltage is a complete system consisting of components such as pipelines, greater than 30 volts AC. Exception No. 1: The voltage may be vessels, heating elements, heat transfer medium, thermal greater than 30 volts but not more than 80 volts if ground-fault insulation, moisture barrier, nonheating leads, temperature sensing device with interrupting capability for personnel controllers, safety signs, junction boxes, raceways and fittings. protection is provided. (d) Resistance Heating Element: A resistance heating element (c). Grounding. The pipeline and/or vessel being heated which is a specific separate element to generate heat which is applied is operating at a voltage greater than 30 but not more than 80 to the pipeline or vessel externally or internally. Tubular shall be grounded at one designated point. heaters, strip heaters, heating cable, heating tape, heating (d) Induced Currents. All current-carrying components shall blankets, immersion heaters, etc. are examples of resistance installed in accordance with Section 300-20. • heaters. be(el Isolation Transformer. A dual-winding transformer wi~h'a (el Impedance Heating System: An impedance heating system is grounded shield between the primary and secondary shall be used a system in which heat is generated in a pipeline or vessel wall to isolate the distribution system from the heating system. by causing current to flow through the pipeline or vessel wall 427-16. Induction Heating. This section covers the by direct connection to an AC voltage source from a dual winding installation of line frequency induction heating equipment and transformer. accessories for pipelines and vessels. See Articl~ 665 for (f) Induction Heating System: An induction heating system is other applications• a system in which heat is generated in a pipeline or vessel wall (a) Personnel Protection. Induction coils and electrical by inducing current and hysterlsis effect in the pipeline or connections to them which operate or may'operate at a voltage vessel wall from an external isolated AC field source. greater than 30 volts AC shall be enclosed in a raceway, (g) Skin Effect Heating System: A skin effect heating system nonmetallic or split metallic enclosure, isolated or made is a system in which heat is generated on the inner surface of a weatherproof by locatioo to protect personnel in the area. ferromagnetic envelope attached to a pipeline and/or vessel. An (b) Induced Current. Induction coils shall be prevented from electrically insulated conductor is routed through and connected inducing circulating currents in surrounding metallic equipment, to the envelope at the far end. The envelope and the supports or structures by shielding, isolation or insulation of electrically insulated conductor are connected to an AC voltage the current paths. All possible stray current paths shall be source from a dual-wlnding transformer. bonded to prevent arcing. 427-3. Application of Other Articles. All requirements of this 427-17. Skin Effect Heating. Code shall apply' except as specifically amended in this (a) Grounding. The ferromagnetic envelope shall be grounded article. Cord-connectedpipe heating assemblies intended for at both ends. The ferromagnetic envelope shall also be specific uses and approved for the purpose shall be installed permitted to be grounded at intermediate points as required by according to Article 422. Fixed electric pipeline and vessel its design. heating equipment for use in hazardous locations shall comply (b) Conductor Ampacity. The ampacity of the with Articles 500 through 516.\ electrically-lnsulated conductor inside the envelope shall not 427-4. Branch-Circuit Requirements. The minimum size of exceed the rating for which it was designed, rated and tested. branch-clrcuit conductors and overcurrent protective devices (c) Pull Boxes. P~ll boxes for pulling the supplying fixedelectric pipeline and vessel heating equipment electrically-insulated conductor in the ferromagnetic envelope shall be calculated on the basis of 125 percent of the total shall be permitted to be buried under the thermal insulation load of the heaters. providing their locations are indicated by permanent markings on the insulation Jacket surface and on drawings. For outdoor B. Installatlon installations pull boxes are to be of watertight construction. (d) Single Conductor in Enclosure. Section 300-20 shall be 427-10. General. waived to allow installation of a single conductor in a (a) Equipment Type and Installation Requirements. Equipment ferromagnetic envelope (metal enclosure). for pipeline and vessel electrical heating shall be (1) of a type compatible with the chemical, thermal and physical C. Construction and Protection environment; and (2) installed in accordance with the manufacturer's drawings and installation instructions. 427-20. Disconnecting Means. (b) Equipment Design. Equipment for pipeline and vessel (a) Switch or Circuit Breaker. Means shall be provided to electrical heating shall be used within the limits for which it disconnect all fixed electric pipeline or vessel heating has been designed. equipment from all ungrounded conductors. The branch-circuit 427-11. Use. Electrical heating equipment shall be installed switch or circuit breaker, where readily accessible to the user in such a manner as to be afforded protection from physical of the equipment, shall be permitted to serve as the damage. disconnecting means. Switches used as disconnecting means shall 427-12. Thermal protection. Accessible external surfaces of be of the indicating type, and shall be provided with a positive pipeline and vessel heating equipment which operate at surface lockout in the "off" position. temperatures exceeding 60°C (140°F) shall be physically guarded, (b) Cord-Connected Equipment. The factory-installed isolated, or thermally insulated to protect against contact by attachment plug of cord-connected equipment rated 20 amp or less personnel in the area. and 150 volts or less to ground is an acceptable means of 427-13. Identification. The presence of electrically heated disconnection. pipelines and/or vessels shall be evident by the posting of 427-21. Controls. appropriate caution signs or markings at frequent intervals (a) Temperature Control with "off" Position.t Temperature along the pipeline or vessel. controlled switching devices which indicate an "off" position 427-14. Resistance Heating Elements. and which interrupt line current shall open all ungrounded (a) Secured. Heating element assemblies shall be secured to conductors when the control device is in this "off" position. the surface being heated by means other than the thermal These devices shall not serve as a disconnecting means unless insulation. provided with a positive lockout in the "off" position. (b) Not in Direct Contact. Where the heating element is not (b) TemperatureControl without "off" Position. Temperature in direct contact with the pipeline or vessel being heated, controlled switching devices which do not have an "off" position means shall be proClded to prevent overtemperature of the are not required to open all ungrounded conductors and shall not heating element unless the design of the heater assembly is such serve as a disconnecting means. that its temperature limitations will not be exceeded. (c) RemoteTemperature Control. Remote controlled (c) Expansion and Contraction. Heating elements and ter~oerature actuated devices shall not be required to meet the assemblies-shall not be installed where they bridge expansion requirements of Section 427-21 (a) and (b) above. Thesedevices joints unless provision is made for expansion ~nd contraction. shall not serve as a disconnecting means• 186 (d) Combined Devices. Switching devices consisting of 427-II. Use. E1ectrlcal heating equipment shall be installed combined temperature actuated devices and manually controlled In such a manner as to be afforded protection from physical switches which serve both as controllers and disconnecting means damage. shall: (1) Open all ungrounded conductors when manually placed 427-12. Thermal Protection. External surfaces of pipeline and in the "off" position, and (2) be so designed that the circuit vessel heating equipment which operate at surface temperatures cannot be energized automatically if the device has been exceeding 60°C (140°F) shall be physically guarded, isolated, or manually placed in the "off" position, and (3) be provided with thermally insulated to protect against contact by personnel in a positive lockout in the "off" position. the area. 427-22. Overcurrent Protection. Heating equip~nt shall be 427-13. Identification. The presence of electrically heated protected against overcurrent in accordance with Section 210-20. pipelines and/or vessels shall be evident by the posting of 427-24. Markings. Each factory-assembled heating unit shall be appropriate caution signs or markings at frequent intervals legibly marked within 3 inches of the end of each power supply along the pipeline or vessel. nonheating lead with the permanent identification symbol, catalog number, and ratings in volts and watts, or in volts and C. Resistance Heating Elements. amperes. 427-25. Electrical Connections. 427-14. Secured. Heating element assen~)lles shall be secured (a) Nonheating Interconnections. Nonheating to the surface being heated by means other than the thermal interconnections, where required under thermal insulation, shall insulation. be made with properly installed insulated connectors approved 427-15. Not in Direct Contact. Where the heating element is for the purpose. not in direct contact with the pipeline or vessel belng heated, (b) Splice Connections and Terminations. Splice connections means shall be provided to prevent overtemperature of the and terminations outside the thermal insulation shall be heating element unless the design of the heater assembly is such installed in a box or fitting in accordance with Sections 110-14 that its temperature limitations will not be exceeded. and 300-15. 427-16. Expansion and Contraction. Heating elements and 427-26. Grounding. Exposed noncurrent-carrying metal parts of assemblies shall not be installed where they bridge expansion electric heating equipment which are likely to become energized Joints unless provision is made for expansion and contraction. shall be grounded as required in Article 250. 427-17. Flexural Capability. Where installed on flexible 427-30. General. Induction and skin effect heating systems may pipelines, the heating elements and assemblies shall have a, be operated at voltages over 600 volts. Requirements for flexural capability compatible with the pipeline. circuits and equipment operating at over 600 volts, nominal, are 427-18. Power Supply Leads. in Article 710. (a) Nonheating Leads. Power supply nonheating leads {cold SUBSTANTIATION: We are completing the scope of the relatively leads) for resistance elements shall be suitable for the new Article 427 which at the present only covers resistance temperature encountered. Preassembled nonheatlng lead) on heating, by adding impedance heating, induction heating and skin approved heaters may be shortened if the markings specified in effect current tracing. Section 427-20 are retained. Not less than 6 inches of PANEL RECOMMENDATION: Accept as Revised: nonheatlng leads shall be provided within the Junction box. (b) Power Supply Leads Protection. Nonheatlng power supply ARTICLE 427-FIXED ELECTRIC HEATING EQUIPMENT FOR leads shall be protected where they emerge from electrically PIPELINES AND VESSELS heated pipeline or vessel heating units by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or other A. General raceways identified as suitable for the application. {c) Interconnecting Leads. Interconnecting nonheatlng leads 427-1. Scope. The requirements of this article shall apply to connecting portions of the heating system shall be permitted to electrically energized heating systems and the installation of be covered by thermal insulation in the same manner as the these systems used with pipelines and/or vessels. heaters. 427-2. Definitions. For the purpose of this article: 427-19. Electrical Connections. Pipeline. A length of pipe including pumps, valves, flanges, (a) Nonheating Interconne~tions. Nonheating control devices, strainers and/or similar equipment for interconnections, where required under thermal insulation, shall conveying fluids. be made with insulated connectors identified as suitable for Vessel. A container such as a barrel, drum or tank for holding this use. fluids or other material. (b) Circuit Connections . Splices and terminations outside Integrated Heating System. A complete system consisting of the thermal insulation shall be installed in a box or fitting in components such as pipelines, vessels, heating elements, heat accordance with Sections 110-14 and 300-15. transfer medium, thermal insulatlon, moisture barrier, 427-20. Marking. Each factory-assembled heating unit shall be nonheating leads, temperature controllers, safety signs~ legibly marked within 3 inches of each end of the nonheating junction boxes, raceways and fittings. leads with the permanent identification symbol, catalog number, Resistance Heating Element. A specific separate element to and ratings in volts and watts, or in volts and amperes. generate heat which is applied to the pipeline or vessel 427-26. Grounding. Exposed noncurrent-carrying metal parts of externally or internally. electric heating equipment which are likely to beceme energized (FPN) Tubular heaters, strip heaters, heating cable, heating shall be grounded as required in Article 250. tape, heating blankets, immersion heaters are examples of resistance heaters. D. Impedance'Heating Impedance Heating System. A system in which heat is generated in a pipeline or vessel wall by causing current to flow through 427-25. Personnel Protection. All accessible external surfaces the pipeline or vessel wall by direct connection to an ac of the pipeline and/or vessel being heated shall be physically voltage source from a dual-winding transformer. guarded, isolated, or thermally insulated (with weatherproof Induction Heating System. A system in which heat is generated jacket for outside installations) to protect against contact by in a pipeline or vessel wall by inducing current and hysteresis personnel in the area. effect in the pipeline or vessel wall from an external isolated 427-26. Voltage~imitations. The pipeline or vessel being ac field source. heated shall not operate at a voltage greater than 30 volts ac. Skin Effect Heating System. A system in which heat is Exception : The voltage shall be permitted to be greater than generated on the inner surface of a ferromagnetic envelope 30 volts but not more than 80 volts if a ground-fault attached to a pipeline and/or vessel. circult-interrupter for personnel protection is provided. (FPN) Typically, an electrically insulated conductor is 427-27. Isolation Transformer. A dual-winding transformer with routed through and connected to the envelope at the other end. a grounded shield between the primary and secondary windings The envelope and the electrically insulated conductor are shall be used to isolate the distribution system from the connected to an ac voltage source from a dual-winding heating system. transformer. 427-28. Induced Currents. All current-carrying components 427-3. Application of Other Articles. All requirements of this shall be installed in accordance with Section 300-20. Code shall apply except as specifically amended in this 427-29. Grounding. T~he pipeline and/or vessel being heated article. Cord-connected pipe heating assemblies intended for which is operating at a voltage greater than 30 but not more specific use and identified as suitable for this use shall be than 80 shall be grounded at one designated point. installed according to Article 422. Fixed electric pipeline and vessel heating equipment for use in hazardous (classified) J ~-- E. Induction Heating locations shall comply with Articles 500 through 516. 427-4. Branch-Circuit Requirements. The ampacity of 427-35. Scope. This part covers the installation of line branch-circuit conductors and size of overcurrent protective frequency induction heating equipment and accessories for devices supplying fixed electric pipeline and vessel heating pipelines and vessels. equipment shall be calculated on the basis of 125 percent of the (FPN) See Article 665 for other applications. total load of the heaters. 427-36. Personnel Protection. Induction coils that operate or may operate at a voltage greater than 30 volts ac shall be B. Installation enclosed in a nonmetallic or split metallic enclosure, isolated or made inaccessible by location to protect personnel in the 427-10. General. Equipment for pipeline and vessel electrical area. heating shall be identified as being suitable.for: 427-37. Induced Current. Induction coils shall be prevented (1) the chemical, thermal and physical environment; and from inducing circulating currents in surrounding metallic (2) installation in accordance with the manufacturer's equipment, supports or structures by shielding, isolation or drawings and instructions. 187 insulation of the current paths. Stray current paths shall be I. In Section 427-4: Change wording to conform with Proposal bonded to prevent arcing. No. 19, to assure consistency. 2. In Section 427-12: Second sentence; delete word "surface," F. Skin Effect Heating which is redundant. 3. In Section 427-16: Third line; make "provision" plural and 427-45. Conductor Ampacity. The ampacity of the change verb "is" to "are." electrically-insulated conductor inside the ferromagnetic 4. In Section 427-56(c): First sentence, third line: Change envelope shall be permitted to exceed the values given in "(b) above" to read "Section 427-55(b)." Article 310 provided it is identified as suitable for this use. 427-46. Pull Boxes. Pull boxes for pulling the electrically insulated conductor in the ferromagnetic envelope shall be permitted to be buried under the thermal insulation providing 427-I (HOD 1978 NEC): Reject CMP 10 their locations are indicated by permanent markings on the SUBMII'TER: Manufacturing Chemists Association insulation jacket surface and on drawings. For outdoor 48 Deletethe second sentence of 427-1. installations, pull boxes are to be of watertight construction. ~'I]B'S'~'A~rIATION: There is a need'for recognition of all types of 427-47. Single Conductor in Enclosure. The provisions of electrical heating in common use today in industry. Section 300-20 shall not apply to the installation of a single There are five methods of electrical heating: (i) impedance conductor in a ferromagnetic envelope (metal enclosure). heating-current flow through the pipeline or vessel wall as an Ca) Grounding. The ferromagnetic envelope shall be grounded impedance; (2) induction heating-current induced into the pipe at both ends and, in addition, it shall be permitted to be by induction; (3) skin effect-current flow confined by skin grounded at intermediate points as required by its design. effect to the inner wall of a tubular steel element welded to or Ferromagnetic envelope shall be bonded at all joints to assure inside the pipeline; (4) external heating with a heating, cable, electrical continuitx. heating tape, strip heaters, tubular heaters, heating blankets, The provisions of Section 250-26 shall not apply to the etc.; IS) internal heating with a heating cable, tubular installation of skin effect heating systems. heaters, immersion heaters, etc., or by electrically-powered (FPN) See Section 250-26(d). circulating heaters. The fifth line of 427-1 specifically excludes two types of G. Control and Protection electrical heating. These should be recognized. PANEL RECOMMENDATION:- Reject. 427-55. Disconnecting Means. PANEL COMMENT: CMP agrees with the intent of the Proposal. See (a). Switch or Circuit Breaker. Means shall be provided to action on Proposal No. 47. disconnect all fixed electric pipelines or vessel heating VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. equipment from all ungrounded conductors. The branch-circuit switch or circuit breaker, where readily accessible to the user of the equipment, shall be permitted to serve as the disconnecting means. Switches used as disconnecting means shall 427-I (HOD 1978 NEC): Reject CMP 10 be of the indicating type, and shall be provided with a positive SUBMITTER: Pipeline Heating Systems, Brecksville, OH lockout in the "off" position. 49 Revise the ending of second sentence to read (b) Cord-and-Plug Connected Equipment. The factory-installed a-a-fTe~-tI~e comma, "other than the impedance method." attachment plug of cord- and plug-connected equipment rated.20 SUBSTANTIATION: Sameas Proposal No. 62 to 1978 Preprint. amperes or less and 150 volts or less to ground shall be PANEL RECOMMENDATION: Reject. permitted to be the disconnecting means. PANEL COMMENT: CMP agrees with the intent of the Proposal. See 427-56. Controls. action on Proposal No. 47. (a) Temperature Control with "Off" Position. Temperature VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. controlled switching devices which indicate an "off" position and which interrupt llne current shall open all ungrounded conductors when the control device is in this "off" position. These devices shall not be permitted to serve as the 427-3: Accept CMP 10 disconnecting means unless provided with a positive lockout in SUBMITTER:" C1aude'E. Deering, Jr., American Petroleum Institute the "off" position. PI~q~I~TAL-~.• 50 Add the word "classified" in parenthesis after (b) TemperatureControl without "Off" Position. Temperature ~word "hazardous." controlled switching devices which do not have an "off" position SUBSTANTIATION: It is proposed that the word "~lqssified", in are not required to open all ungrounded conductors and shall not parenthesis, be inserted after the word "hazardous." This is be permitted to serve as the disconnecting means. consistent with Article 500, which is entitled "Hazardous (c) RemoteTemperature Controller. Remotecontrolled (Class!fied) Locations." The proposed wording recognizes that a temperature actuated devices shall not be required to meet the location is not hazardous per se, but is classifed depending on requiraments of Section 427-56(a) and (b) above. These devices the properties of the flammable or combustible substance'which shall not be permitted to serve as the disconnecting means. may be present, and the likelihood that a flammable or (d) Combined Switching Devices. Switching devices consisting combustible concentration or quantity will be present. of combined temperature actuated devices and manually controlled PANEL RECOMMENDATION: Accept. switches which serve both as the controllers and the PANEL RECOMMENDATION: See Proposal No. 47. disconnecting means shall cemply with all the following ~ON ~~ENDATION: Unanimously Affirmative. conditions: (I) Open all ungrounded conductors when manually 'placed in the "off" position; and \ I (2) be so designed that the circuit cannot be energized 427-3: Accept CMP ~I0 automatically if the device has been manually placed in the SUBMITTER: TSC-Approved for the Purpose "off" position; and I~-0]~-0-~7~-~.• 51 See the Technical Subcommittee "Recommendations" (3) be provided with a positive lockout in the "off" position. un-un-d-e-r-t-fle definition of "Approved for the Purpose" in Article 427-57. Overcurrent Protection. Heating equipment shall be 100. considered as protected against overcurrent where supplied by a SUBSTANTIATION: See the TSC "findings" under the definition of branch circuit as specified in Section 427-4. "Approved for the Purpose" in Article 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept. COMMENT ON VOTE: PANEL COMMENT: See Proposal No; 47, ERICKSON: Although I agree with panel action on this proposal VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I would like to co~Tnent on certain sections.

Section 427-4: Change first sentence to read "The ampacity of branch-circuit conductors supplying fixed electric pipeline and 427-3: Reject CMP 10 vessel heating equipment shall be in accordance with Section SUBMITTER: Warren H. Cook, IEEE 240-3, Exception No. I and Section 210-22(c) where applicable. 52 Changereference from Article 422 to Article 400. See Explanation for Vote on Proposal No. lg. SUBSTANTIATION: Article 422 deals with appliances while Article ~00 is flexible cords and cables. Section 427-26, Exception: The use of the words "for personnel PANEL RECOMMENDATION: Reject. protection" although not defined by the NEC, may imply to I~ANEL COMMENT: The present wording adequately reflects the inspectors a 5 n~ device. These devices would be inoperative on Panel's intent. / an impedance heating circuit since there is mere leakage current VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. than 5 nu~. What is intended is a GFCI as defined by the NEC which would operate at a lower current to ground than the circuit protective device. I recommend those words be deleted., See Section 680-41(a) for a precedent. 427-4: Reject CMP 10 SUBMITTER: Warren H. Cook, IEEE Section 427-29: Delete "one" and add (S) at end of sentence to PR~53 Revise427-4 to read: agree with panel decision and Section 426-34. ~nimum size of branch-circuit conductors supplying fixed electric pipeline and vessel heating equipment shall be Section 426-34(a): This should be renumbered 427-48 to agree calculated on the basis of 125 percent of the total load of the with panel decision and format established in Section 426-44." heaters. The size of branch-circuit overcurrent protective JORDAN: The following comments are editorial: devices supplying fixed eIectric pipeline and vessel heating 188 equipment shall be calculated on the basis of 125 percent of the SUBSTANTIATION: See the TSC "findings" under the definition of total load current. "Approved for the Purpose" in Article 100. SUBSTANTIATION: The use of a minimum requirement for PANEL RECOMMENDATION: Accept. overcurrent protection of branch-circuits could lead to ground PANEL COMMENT: See Proposal NO. 47. currents for extended periods of time. The panel was supplied VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. with a typical circuit of a pipe tracing circuit. PANEL RECOMMENDATION: Reject. PANEL COMMENT: The present wording adequately reflects the Panel's intent. 427 Part D-(New)(HOD 1978 NEC): Reject CMP 10 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: Pipeline Heating Systems, Ind., Brecksville OH COMMENT ON VOTE: 58 Add a new Part D to Article 427 as follows: ERICKSON: Although I agree with the panel action on this specific proposal, I also agree with the intent of the D. Skin Effect Current Tracing proposal. Mr. Cook desires to have minimum sized branch-circuit 427-27. Scope. The provisions of Part D of this Article shall overload protection to provide the best possible ground-fault apply to fixed pipeline heating systems utilizing a tubular protection for resistance heating loads. See comments on resistive heating element of ferromagnetic material and having Proposal 47 for a suggested solution. within the tubular element an electrically insulated return conductor so arranged that the skin effect of alternating current causes the main heating current to concentrate near the 427-12(g)-(New)(HOD 1978 NEC): Reject CMP 10 inner wall of the tubular element. SUBMITTER: Manufacturing Chemists Association 427-28. Insulating Rating. Ph-OI~O-S~CT. 54 (a) The electrical insulation of the inner conductor shall Where a pipeline or vessel wall is used as the heating have a temperature rating greater than the operating temperature element, the pipeline or vessel shall conform to the following: of the cable for the specific system based on the designs and (1) thermally insulated for safety of personnel; (2) tests of the manufacturer. electrically insulated from supporting structures; (3) protected (b) The electrical insulation of the inner conductor shall from physical contact by suitable guards or by location; (4) have a voltage rating at any point on the system higher than the visibly marked as being electrically energized; (5) operating voltage at that point. voltage-to-ground of the pipeline or vessel shall be below 50 (c) The outer conductor (tubular element) shall not require volts AC; (6) circuit-grounded or system- grounded in accordance electrical insulation provided its outer surface is effectively with Section 250-5(a). grounded at one or more locations. SUBSTANTIATION: There is no need to recognize installation of 427-29. Single Cable. A single cable may be used as the equipment used in industry but not previously covered in the internal return conductor if the provisions of Section 427-28(a) NEC. This type of heating has been practiced successfully by are met. industry for many years. The combination of all types of 427-30. Pull Boxes. pipeline and vessel heating into a single article is highly (a) For above ground pipelines, pull boxes for the inner desirable. cable may be covered by the pipeline thermal insulation provided PANEL RECOMMENDATION: Reject. their locations are suitably indicated. PANEL COt~MENT: See Panel action on Proposal No. ~47. (b) For below ground pipelines, pull boxes for the inner VOTE ON PANEL RECO~IENDATION: Unanimously Affirmative. cable may be covered by the pipeline thermal insulation provided COMMENT ON VOTE: they are of waterproof construction and their locations are ERICKSON: I feel the Panel Comment should be changed to "CMP indicated on the pipeline drawings. agrees with intent of proposal." See action on Proposal No. 47. 427-31. Grounding. Each tubular heating element shall be grounded at the power feed point on the pipeline, and additionally may be grounded at other locations. SUBSTANTIATION: Skin effect current tracing was specifically 427-23(a): Accept CMP 10 not included in the 1975 Code because there was insufficient SUBMITTER: Warren H. Cook, IEEE experience with such systems at the time the amendments were ~L: 55 Delete: "and shall be supplied by the heating closed. Such experience is now available. manufacturer. ~ Attached literature explains the principle of operation, which SUBSTANTIATION: The National Electrical Code should address has the remarkable property of allowing a heating current to itself to safety and not source of supply. flow longitudinally through the Wall of a steel tube even though PANEL RECOMMENDATION: Accept. the outer surface of the tube is at ground potential at all I PANEL COMMENT: See Proposal No. 47. points. VOTE ON PANEL RECOMMENDATION: The prime advantage of the.system is the fact that technically AFFIRMATIVE: 8. and economically it is entirely feasible to have single circuits NEGATIVE: Eichhorn. up to seven or more miles in length, thus permitting tracing of J EXPLANATIONOF VOTE: pipelines across rights-of-way, easements, bodies of water, EICHHORN: SectTon 427-23(a). As in Proposal 45, the concern etc,, where power is not available. By its very nature the is about general approval for field connection of power supply system is safe, because all current carrying parts are at all leads to the electric heating elements. times fully enclosed by grounded heavy wall steel raceways or It is suggested that existing Section 427-23(a) to be used for boxes. Section 427-14(e) with this added.- The purpose of each amended paragraph is explained here: Exception: "Fieldconnection of power supply nonheating leads 427-1. Eliminates the exclusion of skin effect heating from (cold leads) to the electric heating elements shall be permitted Article 427. where the means of connection is identified as suitable for this 427-28(a). In most cases it is possible to operate code rated purpose." cables at higher currents in skin effect heating systems than Section 247-20(b). The words "attachn~nt plug of" were permitted by Table 310-16 without exceeding the temperature omitted between "factory installed" and "cord-and plug-connected rating of the cable as given in Table 310-16. Normal code equipment." ampacities are based on three conductors in a conduit and with the thought that heat loss from the conduit might be limited by enclosure within an insulated stud wall, for example. In a skin effect tracing system, one cable, not three, is producing heat. 427-23(b), Exception-(New): Reject CMP 10 More importantly, the temperature of the raceway is known and SUBMITTER: Warren H. Cook, IEEE bears a definite relationship to the pipeline temperature and 56 Add exception as follows: the overall thermal parameters of the system. Since cable Exception: Metal conduit or metallic tubing shall not be temperature and not current is the true basis of any rating, lit required for cord connected equipment when adequately protected is possible to design with higher currents when all facts are by other means. known; a wide margin for error is thus unnecessary. SUBSTANTIATION: The placement of heating wire directly on the 427-28(c). Section 310-2 states "Conductors shall be vessel to be heated requires a flexible, open connection between. insulated." The heat tube of a skin effect system is in truth the heating wire and the raceway system. This flexible open insulated by electrical magnetic properties; under normal or connection has been found to be satisfactorily and suitably made fault conditions the outer surface is always isolated by extending the cold leads in protected manner from the heated (insulated) from the circuit voltage. But , every other component to a fitting of the raceway system. A suitable length application the Code thinks in terms of Circuit theory rather has been found to be 18 inches maximum. than wave theory. In order to avoid possible misunderstandings, PANEL RECOMMENDATION: Reject. this paragraph is included. The presence of a ground assures PANEL COMMENT: See Panel action on Proposal No. 47. the absence of voltage. There are technical approaches to this VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. special situation that are somewhat more definitive, but are felt inappropriate for the NEC. 427-29. Section 300-20 requires that "all phase wires be grouped" when in a metal raceway "to avoid heating the 427-25: Accept CMP 10 surrounding metal by induction." The usual situation this SUBMITTER: TSC-Approved for the Purpose section prohibits is obviously hazardous, for very high 57 See the Technical Subcommittee "Recomendations" uncontrolled temperatures are possible. The skin effect tracing under the definition of "Approved for the Purpose" in Article system requires a single conductor in a metal tube specifically 100. to create heat in the tube, although not strictly by induction. This is permissible because the temperature of the system is 189 known, and is part of the design. 427-30. Self explanatory. 427-31. Skin effect tracing systems should be grounded at one point, even though they are universally directly mounted on grounded pipes or vessels. Even in the unlikely occurrence of an ungrounded pipe and a broken ground wire, there will be no harmful closed circuits if contacted by personnel or conducting material. PANEL RECOMMENDATION: Reject. PANEL COMMENT: CMP agrees with the intent of the Proposal. See action on Proposal No. 47. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

190 REPORT OF CODE-MAKING PANEL NO. II Diagram 430-1: Reject CMP 11 SUBMITTER: Warren Anderson, Mount Vernon, WA l~TOl~O~rAt-~.'3 Revisediagram as follows: e~l ". Part A ARTICLE 430 -- MOTORS, MOTOR CIRCUITS, AND CONTROLLERS Requirements for over 600 volts Part J Protection of live parts all voltages Part K Diagram 430-I: Accept CMP 11 Grounding Part L SUBMITTER: A. P. White, Attleboro, MA Tables Part M

~Motor Feeder Overcurrent Protection TO READ: Motor Feeder Short Ciruit and Ground Fault Rl~tt,~ 014grm IS fo110ml: Protection. CHANGE: Motor Branch Circuit Overcurrent Protection TO READ: Motor Branch,Circuit Short Circuit SUPPLY and Ground Fault Protection. CHANGE: Motor Running Overcurrent Protection TO READ: FE£~ OVIS~K:UR~ m~T Motor Overload Protection. CHANGE: Inherent Protection TO READ: Thermal Protection. NOT~ ~.EO~ PART B: $4¢. 430-24. 25, SUBSTANTIATION: Related editorial revisions for the following Sections: Diagram 430-I; Part C Heading; Sections 430-32(a-1), ROTOR OI~.Olq~ECTING M£ANS PART H -32(d), -351b), -37, Table 430-37 Heading~ -38, -39, -40, -42(a), -42(b), -42(c), -43, -52, -53(a-3), -53(c), -53(c-I), M~TO~ ~ ~ OriENT PART 0 -53(d), -55, -125(a), -152 Table Heading; Example No. 8; 440-21. ~IIEC'TION Editorial revision of Articles 430 and 440 of the 1975 NEC were for clarification of the terms - overload, overcurrent, and MOTCR CCKT~LL£R & MOTOR pAJITS G II F short-circuit and ground-fault protective device. Since not all the changes required were made, this series of related proposals RUI~4I~ OV£RCURRINT PART C are submitted to complete the editorial changes and preserve the ~cTIo~ intent for the terms "overload," "overcurrent," and 140TOR CI~UIT O~40L~TORS PA~T It: SIC. 430-Z2 "short-circuit and ground-fault" devices. This follows where the editoral revisions in the 1975 NEC confirmed that "overload (for motors)" in Article 430 means PART A & C current due to overload and failure to start and excludes fault MOI~}R I¢4ER~$T PROTIECTION ~ currents caused by short circuit and ground fault. The editorial revisions in the 1975'NEC replaced references to $ECOROARY COXTRO~ER PA~cr B: S~. 430-Z3 "motor running overloads" and"motor running overcurrent" with the term, "motor overload," wherever it was the intent that the PART B: S~. 430-23 & Art.. 470 currents involved were due to both overload and failure to start. Additionally, the motor branch circuit protective device such as in Part D was confirmed as intended for protection against SUBSTANTIATION: Diagram 430-1 would be easier to understand and only short-circuit and ground-fault currents and excludes add clarity to the code if it were redrawn so that the sequence overload currents. In contrast, the term, "overeurrent," of devices more closely follows the actual alignment of devices includes any current resulting from overload, short circuit and that are found in the field. ground-fault. The editorial revisions in the 1975 NEC intended PANEL RECOMMENDATION: Reject. to use the term, "short-circuit and ground-fault protective PANEL CO~4ENT: Supporting comment is not persuasive as to device" in place of the term, "overcurrent" wherever it was the necessity. No additional clarification would be achieved by intent that only fault currents were involved due to short this Proposal. circuit and ground. . , VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised: The same editorial changes required by this Proposal are also required in additional sections of Articles 430 and 440 as follows: 430-2: Accept CMP 11 430-3. In paragraph 2 line i delete the words "running SUBMITTER: Edwin H. Luoma, Reliance Electric Co. overcurrent" and replace with the word "overload." IsITOIRTS'A~-T.'4 In the second sentence of the first paragraph add 430-6 (a). In line 4 delete the words "overcurrent devices" and "overload" after the word "additional." replace with the words "short-circuit and ground-fault SUBSTANTIATION: The second sentence is not complete in meaning protection." wltnout tne word "overload" as shown in the revised sentence In lines 6 and 7 delete the words "motor-running overcurrent" above. We feel the intent of the code would also be satisfied and replace with the words "motor overload.~' with the addition of the word "overload." 430-6 (b). In lines 4 and 5 delete the words "motor running PANEL RECOMMENDATION: Accept. overcurrent" and replace with the words "motor overload." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 430-6 (c). In lines 3 and 4 delete the words "overcurrent devices" and replace with the words "short-circuit and ground-fault protection." 430-7 (b). In line 6 delete the word "overcurrent" and 430-2: Reject CMP 11 replace with the words "short-circuit and ground-fault." SUBMITTER: IdahoChapter IAEI 430-7 (d). In lines 5 and 8 delete the we~d "overcurrent" and I~RI33R}~FAL-T." 5 In Section 430-2 delete the second sentence and replace with the words "short-circuit and ground-fault move ~t sentence to Section 430-52. protective." SUBSTANTIATION: (See proposal for new Exception No. 2 for 430-8. In lines 4 and 6 delete the words "motor-running Section 430-52.) overcurrent" and replace with the words "motor overload." PANEL RECOMMENDATION: Reject. In line 7 delete the word "overcurrent" and replace with the PANEL COMMENT: The revised wording adequately reflects Panel's words "short-circuit and ground-fault." intent. See Proposal No. 4. 430-54. In line 2 insert the words "short-circuit and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ground-fault" after the words "branch-circuit." 440-22 (b). In line 7 insert the words "short-circuit and ground-fault" after the word "equipment." Paragraph (b) (1) line 2 insert the words "branch-circuit 430-4: Reject CMP 11 short-circuit and ground-fault" after the words "setting of the." SUBMITTER: Robert G. MacManus, Pawtucket, RI Paragraph (b) (2) line 2 insert the words "branch-circuit ~6 Delete the figure "50" and replace with "25." short-circuit and ground-fault" after the words "setting of the." ~B-STAI~TIATION: The NEC has for many years allowed one piece of Paragraph (b) (2) Exception No. I line 4 delete the word equipment to be "in sight from" another piece of equipment if it "circuit" after the word "maximum" and replace with the words is visible and not more than 50 feet distant. However, the rule "branch-circuit short-circuit and ground-fault." does not take ihto consideration the fact that temporary or VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. permanent equipment or material could later block the view and cutting the distance in half would make for much safer conditions. It will be noted that Section,430-102 no longer allows the discennecting means to be locked in the open position. Diagram 430-I: Accept CMP 11 PANEL RECOMMENDATION: Reject. SUBMITTER: TSC-Nominal Voltage PANEL COMMENT: The supporting con~nent does not Justify the ~ITOIR~S-AL-T.'2 In the second line add "nominal" after "600" proposed change. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: To conform to the guidelines established by the TSC on Nominal Voltages. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

191 430-5: Accept ~ CMP 11 motor nameplates where the motor does not include thermal or SUBMITTER: Larry T. Smith and LaVerne E. Stetson, Lincoln, NB impedance protection. It is quite possible today to have an I~TOPO-S'A-L-~: 7 Changeto include Article675. Electrically overload relay selected properlywith regard to motor full load ~r controlled irrigation machines. current and yet have motor burnout because the wrong class of SUBSTANTIATION: The readers attention should be directed to the overload relay was used. Unless the motor is marked with its provisions of Article 675. Many installers, for example, are maximum overload relay class, there is no way for an electrician not aware of the equivalent current ratings given in Section or inspector to know if the overload relay is the proper class 675-22. for the motor. PANEL RECOMMENDATION: Accept. PANEL RECOMMENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT:. The Panel believes that extending the requlrements as indicated by this Proposal is not necessary as the Code now permits this marking. VOTE ON PANEL RECOMMENDATION: 430-7(a)(14)-(New): Reject CMP 11 AFFIRMATIVE: 16. SUBMITTER: Kenneth L. Paape, Allen-Bradley Co. NEGATIVE: Schram. I~ITOIR)~-~.• 8 Add new (14) as follows: EXPLANATION OF VOTE: ~Overload relay class, where the motor is not marked SCHRAM: The matching of the locked rotor characteristics of "Thermally Protected" or "Impedance Protected." (See Section motors and overload relay protective devices is an important 430-41). part of motor protection that is not now covered in the NEC. SUBSTANTIATION: A system of class designations, Class 10, 20 or The marking of the maximum overload relay class on the motor 30, exists for overload relays. .(See paragraphs 23.2 and 36.15 would aid in providing proper levels of protection. of UL508). The numerals in these class designations (e.g., 10, 20 or 30) indicate the maximum time in seconds required for the overload relay to trip at a current which is equal to 600% of the current element rating. Since an overload relay must 430-7(d): Reject CMP 11 ultimately trip at 100% of its current element rating and within SUBMITTER: Richard J. Denny, Air Conditioning & Refrigeration 8 minutes at 200% of its current element rating, a time-current T~ characteristic can be drawn for each overload relay class. With PROPOSAL: 10 Add a sentence before the last sentence of the this information the motor manufacturer is the most qualified to ~ragraph as follows: select the overload relay class which best matches the motor In no case shall the marked maximum rating of the circuit insulation system and heating characteristics under overcurrent device be less than the marked minimum supply acceleration, overload, or locked rotor conditions. Neither circuit conductor ampacity. installers nor inspectors have easy access to the technical SUBSTANTIATION: The actual marked values may be greater than details required to select an overload relay of the proper class. the calculated minimum, and/or may be less than the calculated A more detailed explanation of the overload relay class maximum. Under the present rules, the marked maximum rating of designation system is included with a companion proposal for a the overcurrent device (fuse or circuit breaker) could be less new Section 430-41 to require that overload relays be marked than the marked minimum supply circuit conductor ampacity, with their class designation. The time-current curves of 3 .especially since the marked maximum fuse or circuit breaker overload relay classes and table of expected motor insulation rating is normally _reduced from the calculated maximum to a life at different temperatures prepared for the Section 430-41 standard rating as given in Section 240-6. The possibility of proposal are attached. this occurrence is greater when a substantial part of the All overload relay current elements are selected on the basis combination load is electric resistance space heating. There of their current rating (ultimate t~ip current) regardless of are products on the market with this cross-over of marked overload relay class, yet overload relays with high class limits. Although Section 430-53(c)(4) permits the rating of the designations require more time to trip at 600% of their rating. fuse or circuit breaker to be increased to the next standard Relays which take longer to trip at 600% of their rating provide rating higher than the conductor ampacity (by reference to more time for the motor and its load to accelerate to full Section 240-3 Exception No. 1), the marked maximum rating of the speed. Section 430-34 requires that the overload relay have fuse or circuit breaker cannot be exceeded per Section 430-54. sufficient time delay to permit the motor to start and The change is to remove unintended permission for a crossover of accelerate its load. Only the motor manufacturer knows the the minimum and maximum marked values. maximum load (in terms of inertia and acceleration time) that PANEL RECOMMENDATION: Reject. the motor can bring up to speed without overheating. The PANEL COMMENT: Proposal is primarily a design consideration. overload relay class that best conforms to the motor capability VO~E ON PANEL RECOMMENDATION: ought to be shown on the motor nameplate. AFFIRMATIVE: 16. PANEL RECOMMENDATION: Reject. NEGATIVE: Schram. PANEL COMMENT: The Panel believes that extending the EXPLANATION OF VOTE: requirements as indicated by this Proposal is not necessary as SCHRAM: Whlle we agree a design consideration is involved, it the Code now permits this marking. is the design of the marking. We do not believe the Code should VOTE ON PANEL RECOMMENDATION: permit a marking which in conflict with'the intent, as stated in AFFIRMATIVE: 16. the proposal. NEGATIVE: Lopez." COMMENT ON VOTE: SCHRAM: See explanation of negative vote on Proposal No. 9. We believe the marked overload relay class should be the maximum 430-7(d): Reject CMP 11 class, in accordance with Proposal No. g. SUBMITTER: Alton R. Thompson, Durham, NC EXPLANATION OF VOTE: 11 Add a sentence before the last sentence of the LOPEZ: I disagree with the Panel's Recon~nendation since I Tl-~ragraph as follows: believe this proposal will improve the motor overload In no case shall the marked maximum rating'of the circuit protection. The marking of overload relay class on the motor overcurrent device be less than the marked minimum supply nameplate will help the users with the selection of the proper circuit conductor ampacity. overload relay to utilize. SUBSTANTIATION: The actual marked values may be greater than the calculated minimum, and/or may be less than the calculated maximum. Under the present rules, the marked maximum rating of the overcurrent device (fuse or circuit breaker) could be less 430-7(a)(14)-(New): Reject . CMP 11 than the marked minimum supply circuit conductor ampacity, SUBMITTER: MarvinT. Stevens, Greendale, WI especially since the marked maximum fuse or circuit breaker ~TOFOTATT." 9 rating is normally reduced from the calculated maximum to a Maximum overload relay class, where the motor is not standard rating as given in Section 240-6. The possibility of marked "Thermally Protected" or "Impedance Protected." this occurrence is greatest when a substantial part of the (FPN) See Sections 430-34 and 430-40. combination load is electric resistance space heating. There SUBSTANTIATION: This proposal is one of a package of three and are products on the market with this cross-over of marked should be considered with proposals relating to overload relay limits. Although Section 430-53(c)(4) permits the rating of the class designations submitted for Sections 430-34 and 430-40. fuse or circuit breaker to be increased to the next standard At the time a motor manufacturer designs a motor he takes Into rating higher than the conductor ampaclty (by reference to consideration the maximum inertia load that the motor should be Section 240-3 Exception No. 1), the marked maximum rating of the capable of accelerating. The motor manufacturer also knows the fuse or circuit breaker cannot be exceeded per Section 430-54. maximum allowable locked motor time which his motor can endure The change Is to remove unintended permission for a crossover of without undue deterioration of the insulation. the minimum and maximum marked values. Both the motor acceleration time and the maximum allowable PANEL RECOMMENDATION: Reject. locked rotor time for the motor can be related to the PANEL COMMENT: See Panel comment on Proposal No. 10. time-current characteristics of overload relays and the overload VOTE ON PANEL RECOMMENDATION: relay class requirements of ANSI C33.76-1976. Nationally AFFIRMATIVE: 16. recognized testing laboratories verify time-current NEGATIVE: Schram. characteristics in accordance with ANSI C33.76-1976 before EXPLANATION OF VOTE: awarding listing to a line of overload relays. Since the system SCHRAM: See Con1~ent in Proposal No. 10. of class designation exists and is based on fundamental data best interpreted by the motor manufacturer, it would seem prudent to require the maximum overload class to be marked on

192.

,/ 430-10 and Table 430-10-(New): Reject CMP 11 SUBSTANTIATION: The conductor termination means furnished SUBMITTER: K. L. Paape, Allen-Bradley Co. with motor controllers are evaluated as part of the controller !~TOIRT~:/~-~.. 12 Revise430-10 by adding a new paragraph in order to obtain listing by a nationally recognized testing a-'fq!-~'6-'t'ITe fine print note as follows: laboratory. Most installing electricians are not aware that Where the conductor termination means (lugs) supplied by the changing the termination of a controller nullifies this listing. manufacturer of a listed motor controller are replaced by other Field experience has shown that the screw ttlpe lugs furnished conductor termination means, conductors shall not be deflected with listed motor controllers are occasionally replaced with at a terminal unless bending space In accordance wlth Table crimp type lugs at the time the controllers are installed even 430-10 is provided. And add a new table as follows: though the,replacement lugs may not include an anti-rotation feature which the original termination had. When the individual Table 430-10. Minim~ Wlre Bending Space at making the installation uses a listed lug as a replacement with Terminals in Inches no concern for its length, he can create a situation where the AWG or wiring space is not adequate and the conductors are subject to Circular-Mil Wires per Terminal damage as they are forced between the end of the lug and the Size of Wire 1 2 3 4 5 wall of the enclosure. In addition, inadequate wiring space may lead to improper 14 Not Specified orientation of the new lugs with a resulting loss of electrical 12-6 1 1/2 clearance. Since nationally recognized testing laboratories 4-3 2 list lugs with no constraint on their length, and only a small 2 2 1/2 percentage of all motor controllers manufactured are used with 1 3 lugs other than those furnished, there is no practical way for a 0-00 3 1/2 5 7 .... controller manufacturer to anticipate the wiring space that may 000-0000 4 6 8 .... be required under changed lug conditions. The individual 250-MCM 4 1/2 6 8 10 -- choosing to change the conductor termination should be made 300-350 MCM . 5 8 10 12 ._ responsible for proper lug selection. 400-500MCM 6 8 10 12 14 Proposed Table 430-10 is based on the table recommended by 600-700 MCM 8 10 12 14 16 Underwriters Laboratories as a result of a fact=finding 750-900 MCM 8 12 14 16 18 investigation sqggested by CMP 11 regarding adequat~ wiring 1000-1250 MOM i0 space In enclosures for motor controllers. 1500-2000 MCM 12 PANEL RECOMMENDATION: Reject. PANbL COMMENT: Accepted Proposal No. 15. Bending space at terminals shall be measured in a straight VOTE ON PANEL RECOMMENDATION:' Unanimously Affirmative. line from the end of the lug or wire connector (in the direction that the wlre leaves the terminal) to the wall or barrier. SUBSTANTIATION: The conductor termination means furnished with motor controllers are evaluated as part of the controller in 430-10: Reject CMP 11 order to obtain listing by a nationally recognized testing SUBMITTER: R. E. Smith, Cutler-Hammer Inc. laboratory. Most installing electricians are not aware that 14 Revise as follows: changing the termination of a controller nullifies this listing. ~. Wiring Space in Enclosures. Field experience has shown that the screw type lugs furnished (a) General. Enclosures for motor controllers and wlth listed motor controllers are occasionally replaced with disconnecting means shall not be used as junction boxes, crimp type lugs at the time the controllers are installed even auxiliary gutters, or raceways for conductors feeding through or though the replacement lugs may not include an anti-rotation tapping off to the other apparatus unless designs are employed feature which the or.igianal termination had. When the which provide adequate space for this purpose. individual making the installation uses a listed lug as a (b) Wire Bending Space. Minimum wire bending space shall be replacement with no concern for its length, he can create a in accordance with Table 430-10(b) and measured in a straight situation where the wiring space !s not adequate and the line from the end of the terminal connector, supplied with the conductors are subject to damage as they are forced between the controller (In the direction the wire leaves the terminal) to end of the lug and the wall of the enclosure. the enclosure wall or barrier. Alternate terminals shall be of In addition, inadequate wiring space may lead to improper a type identified for use with the controller and shall not orientation of the new lugs with a resulting loss of electrical reduce the minimum wire bending space. clearance. Since nationally recognized testing laboratories list lugs wlth constraint of their length, and only a small TABLE 430-I0(B). MINIMUMWIRE BENDING SPACE AT percentage of all motor controllers manufactured are used with TERMINALS OF ENCLOSED MOTOR CONTROLLERS IN INCHES other than the lugs furnished there is no practical way for a controller manufacturer to anticipate the wiring space that may AWG or be required under changed lug conditions. The individual Circular-Mil. Wires Per Terminal choosing to change the conductor termination should be made Size of Wire 1 2 responsible for proper lug selection. Proposed Table 430-10 is based on present Table 373-6(a). 14-I0 not specified .... PANEL RECOMMENDATION: Reject. 8-6 1 I/2 .... PANEL COMMENT: Accepted Proposal No. 15. 4-3 2 .... VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 2 2 1/2 .... 1 3 .... 0-00 3 I/2 .... 430-10: Reject CMP 11 000-0000 7 7' 12 SUBMITTER: Kenneth L. Paape, Alle~-Bradley Co. 250MCM 8 1/2 8 1/2 12 PITOPO-~7~-T. 13 ExpandSection 430-10 by adding a paragraph and 300-350MCM I0 I0 15 follows: 400-500MCM 12 t 12 15 430-10 Wiring Space in Enclosures. Enclosures for motor 600-700MCM 15 15 18 controllers and disconnecting means shall not be used as 750-900MCM 18 18 21 Junction boxes, auxiliary gutters; or raceways for conductors SUBSTANTIATION: An Underwriters Laboratories fact-finding feeding through or tapping off to the other apparatus unless investigation has shown the need for a wire-bending space table designs are employed which provide adequate space fop this for motor controllers. The above proposed table was developed, purpose. taking into consideration the following diversity factors. The See Section 373-8 for switch and overcurrent-device enclosures. UL investigation has confirmed that these factors have an Where the conductor termination means (lugs) supplied by the influence on the amount of wlre-bending space required. Several manufacturer of a listed motor controller are replaced by other of these factors are present in any given motor controller 'lugs, these lugs shall be sized so that wire bending space in installation. accordance with Table 430-10 is available. I. The depth of motor controller enclosures provides added volume which, allows the forming of wires, sizes AWG 2/0 and Table 430-10 - Minimum Wire Bending Space smaller, to facilitate their connection to the controller at Terminals in Inches connectors. 2. Wire ampacity selection is based on motor horsepower and Max. Conductor Conductorsper Terminal voltage rating. The value of motor current is always less than Size the current rating of the standard motor controller which would AWG or MCM 1 2 3 be used. IO • Not Speclfled Example: A motor rated 50HP at 460 volts (65FLA) requires 6 1 1/2 wire rated at 82 amperes (1.25x65) which falls within the 3 2 ampacity rating of #2AWG copper wire (95A) or #1AWG aluminum 2 2 i/2 wlre (85A). 1 3 The standard motor controller with a max. rating of 50HP, 460 2/0 3 1/2 volts has a current rating of 90A and is provided with wire 4/0 7 7 12 connectors capable of accepting #1AWG copper wire. When 250 MCM 8 I/2 8 1/2 12 designed for use with aluminum wire, the wire connector is 350 MCM ' 10 10 15 capable of accepting #2/OAWG aluminum wire. The net result is 500 MCM 12 12 15 that the connector wire range of the motor controller usually 700 MCM 15 15 18 exceeds the size of the wire required for the installation. The go0 MCM ' 18 18 21 193 UL fact-finding investigation indicates that this is an shall have minimum dimenslons and usable volumes in accordance important factor which facilitates wire installation. with the following: 3. In the wire range of 2/OAWG and smaller, most motor control (1) For motors rated one horsepower and smaller, having not installations use copper wire. The UL fact-finding over four leads and having terminal housing partially or wholly investigation indicates that copper wire is easier to integral with the frame or end shield. The volume of the manipulate. Further, a smaller size copper wire is generally terminal housing shall be not less than 2 'cubic inches per used for the equivalent ~l~)acity rating of aluminum wire. wire-to-wire connection. The minimum cover opening shall be no 4. Motor controllers are designed to permit the additio~of less than 1.5 inches. accessories such as control transformers, auxiliary contacts, (2) For alternating current motors, having a maximum of 12 pushbuttons, selector switches, pilot lights, etc., which result leads entering the terminal box shall incorporate terminal boxes in oversize enclosures for many applications. no smaller than as shown in Table 430-12(b)(1). 5. Since motor controllers are not permitted to be used as (3) For direct current motors having a maximum of 6 leads junction boxes by the NEC, only one wire per terminal need be entering the terminal box shall have dimensions and usable considered for wire sizes 2/OAWG and smaller. volumes not less than shown in Table 430-12(b)(2). 6. Motor controllers are generally easily removed from their enclosures which can improve access to the wire connectors and ATTACHMENT A facilitate the connection of wires to the connectors. 7. Manymotor controllers are designed in a manner which al!ows easy removal of the wire connectors from the coBtroller. The Table 430-12(b)(1) connector can be fastened to the wire and reassembled to the w controller. Alternating-Current Motors PANEL RECOMMENDATION: Reject. Motors Over 11 Inches in Diameter PANEL COMMENT: Accepted Proposal No. 15. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Max. Full-load Current for Three Terminal Usable Typical 430-10(b)-(New): Accept CMP 11 phase Motors with Box Volumn Maximum SUBMITTER: Harold E. Whiting, St. Charles, IL Max.'of Twelve Minimum Minimum Horsepower !~TOl~O'S'At-~." 15 Identify present paragraph as (a) General. Leads Dimension ~ubic Three Phase ~w (b) and Table 430-I0(b) as follows: Inches Inches 230 volt 460 volt (b) Wire Bending Space in Enclosures. Minimum wire bending Amperes space within the enclosures of motor controllers shall be in accordance with Table 430-I0(b) when measured in a straight line from "the end of the lug or wire connector (in the direction the 45 2.5 26 15 30 wire leaves the terminal) to the wall or barrier. Where 70 3.3 55 25 50 alternate wire termination means is substituted for that 110 4.2 100 40 75 supplied by the manufacturer of the controller they shall be of 160 5.4 190 60 125 a type identified by the manufacturer for use with the 250 7.0 330 100 200 controller and shall not reduce the minimum wire bending space. 400 9.3 600 150 300 Table 430-10(b). Minimum Wire Bending Space at the Terminals 600 10.7 1100 250 500 of Enclosed Motor Controllers (In Inches)

AWG or Circular-Mil *Wires Per Terminal Size of Wire 1 2 Table 430-12(b)(2) 14 - 10 Not specified Direct-Current Motors 8 - 6 1 1/2 Motors Over 11 Inches in Diameter 4 - 3 2 2 2 I/2 1 . 3 - i/0 ~ 5 5 - 2/0 6 6 Maximum Full-load 3/0-- 4/0 7 7 Current for Terminal Box Usable 250 8 8 Motors with Minimum Volume 300 10 10 Maximum of Six Leads Dimensions Minimum 350 - 500 12 12 Inches Cubic Inches 600 - 700 14 16 Amperes 750 - 900 18 19 68 3.3 5b *Where provision for 3 or more wires per terminal exists the 105 4.2 100 minimum wire bending space shall be in accordance with 165 5.4 190 requirements of Article 373. 240 7.0 330 SUBSTANTIATION: A fact finding investigation by a nationally 375 g.3 600 recognized testing laboratory has indicated a need to specify 600 10.7 1100 the wire bending space necessary within enclosed motor 900 15.0 2000 controllers. Evidence also indicates this space should be different for I and 2 wires per terminal from that required for cabinets and cut out boxes as listed In Table 373-6(a) and SUBSTANTIATION:' Most users of motors find the terminal box therefore a separate table in 430-10 is required. sizes Ilsted in present Sec, 430-12(b) to be entirely The table presented in this proposal provides adequate space inadequate. This inadequacy stems both from insufficient space for wiring by experienced installers using approved wiring for all the wires and splices and from the necessity for techniques without increasing the unsupported lengths of wire to oversharp bending of the wires. Both of these contribute to dimensions which might permithazardous deflection during high physidal overstressing of the insulation which results in current fault conditions. inordinate failure rates of conductors in the termlnal boxes. Control of the type of alternate wire termination means must In seme studies it has been found that one-quarter of all be left with the manufacturer of the controller to assure "motor" failures occurred in the terminal boxes. While failure listing requirements and wire bending space requirements of the rate is not a basic criterion of the Code, there is ample controller are not violated. evidence in other articles to prove that adequate wiring space PANEL RECOMMENDATION: Accept. is prescribed for freedom from failures, a major cause of fires; VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. Articles 370, 373 and others require more satisfactory space for COMMENT ON VOTE: making bends and connections. SCHRAM: An affirmative vote is cast to support the addition Knowledgeable users have simply been specifying larger of bending space requirements in Article 430. However, it terminal boxes on factory orders to obtain serviceable should be noted that the proposal differs in several respects equipment. Others, and those purchasing motors from stock, fro~ the proposals being considered for Article 373. We believe discard the original boxes and fabricate more adequate ones for the requirements in Article 430 would need to treat motor the installation. The manufacturers hold that Original control centers, which have some design elements similar to Equipment Manufacturers buy the major proportion of motors, and switchboards and others similar to motor controllers, in a require the very minimum sizes of terminal boxes. It must be manner consistent with the treatment proposed for Article 373. remembered that few OEM's actually use these items and many do not even wire up the motors. In any event, OEM's do not ordinarily become involved with maintaining the motors, replacing bearings, etc. which require disconnection and 430-12(b): Accept CMP 11 reconnection of the motor, involving disassembly and reasse~foly SUBMITTER: A. C. Clark, Manufacturing Chemists Assn. of the wiring In the terminal boxes. For this very important !~R-OIs~L-~." 16 Revise as follows: reason, it is suggested that the OEI~ viewpoint is unsound, and ---Tb-)--l~imensions and Space--Wire-To-Wire Connections. When if Sec. 430-12(b)is based on this, the section would be better these terminal housings enclose wire-to-wire connectlons, they deletes from the Code. 194 It Is well known that the bending of stranded wires more 430-16: Reject CMP 11 sharply than as outlined i 9 Sec. 373-6 for a single 90° bend, or SUBMITTER: O. E. Dillon, Border County Div. IAEI double these dimensions for a 180° bend will result in PITOIRT~_-~.'20 Revise as follows: inserviceable operation, through stretching of the outer strands Exposure to Dust Accumulation. In locations where dust and inordinate pressure on the insulation. Space and size of or flying material collects on or in motors in such quantities motor terminal boxes requires that the splices be made up as to cause the motor temperature to rise beyond its rating, a outside the boxes, then formed into the boxes, usually incurring motor that will not overheat under the prevailing conditions a U-bend. The proposed sizes of the terminal boxes in Sec. shall be used. Conditions may require the use of enclosed 430-12(b) provide space for making these bends and splices pipe-ventilated motors, or enclosure in separate dust-tight without exceeding the bending sharpness specified in Sec. 373-6. rooms, ventilated from a source, of clean air. PANEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: The use of the words "seriously interfere" and First two Tables on page 292 in the 1978 NEC to be shown as in "dangerous temperatures" renders this section legally Attachment A. Also in Attachment A, Table 430-12(b)(1), column unenforecable. See the attached opinion* of the San Diego City 3 entitled "Usable Volume Minimum Cubic Inches," change fourth Attorney. figure down from "190" to "180." In same Table, column 2 *See Border County Div. IAEI substantiation for CMP 1 Proposal entitled"Terminal Box Minimum Dimension Inches" change the No. for 110-16(a). following: from "4.2" to "4.0," "5.4" to "5.0," "7.0" to "6.0," PANEL RECOMMENDATION: Reject. "9.3 to "7.2" and "10.7" to "8.8." PANEL COMMENT: No significant contribution to safety would In Table 430-12(b)(2), column 2 entitled "Terminal Box Minimum result. Dimensions Inches" change the following: from "4.2" to "4.0," VOTE ON PANEL RECO~bMENDATION: Unanimously Affirmative. "5.4" to "5.0," "7.0" to "6.0," "9.3" to "7.2," "10.7" to "8.8" and "15" to "10.7." In same Table, column 4 entitled "Usable Volume Minimum Cubic Inches," change third figure down from "190" to "180." 430-22(a): .Accept CMP 11 VOTE ON PANEL RECOMMENDATION: SUBMITTER: J. J. Kark, National Electrical Manufacturers AFFIRMATIVE: 16. ~on NEGATIVE: Wood. PROPOSAL: 21 Revise the first paragraph to read as follows: EXPLANATION OF VOTE: Branch-circuit conductors supplying a single "AC" motor, "or a WOOD: The revision made by CMP 11 does not help to alleviate DC motor operating from a source other than a rectified the space problem in smaller sized motors as originally single-phase AC supply," shall have an ampacity not less than proposed. The Panel's revisions result in Virtually no change 125 percent of the motor full-load current rating. from present values. Add the following new paragraph between the existing second and third paragraph (retain the existing paragraph entitled "Exception" as the fourth paragraph): In case of direct-current motors operating from a single-phase Table 430-12(c)(1): Accept CMP 11 power supply, the conductors between the controller and the SUBMITTER: TSC-Nomina] Voltage motor shall have an ampacity of not less than the following ~ 17 Change "volts" in the left column heading to read percent of the motor full-load current ratinggiven in Table Volts" 430-147: I SUBSTANTIATION: To conform to the guidelines established by the (1) Where a rectifier bridge of the single-phase half-wave TSC on Nominal Voltages. type is used, 190 percent• PANEL RECOMMENDATION: Accept as Revised: (2) Where a rectifier bridge of the single-phase full-wave I In addition, first line of first column should read "240 or type is used, 150 percent. less" and second line of the first column "over 240 through 600." SUBSTANTIATION: This proposal recognizes the existence of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. significant form factors for integral-horsepower motors operating from single-phase power supplies and the need to select conductors on the basis of rms current rather than on the basis of average current. CMP-11 may wish to editorially 430-12(e)-(New): Accept CMP 11 restructure this section for any clarity believed necessary to SUBMITTER:, Idaho Chapter IAEI incorporate the intent of the proposal. I~TOIsl~S'AT~.• 18 Add a section (e) to Section 430-12. PANEL RECOMMENDATION: Accept as Revised: ~quipment Grounding Connections. Equipment grounding Change existing Exception to Exception No. 1 and add the connection devices or fittings as required by Section 250-113 following as Exception No. 2: shall be provided at motor terminal housings. Such devices or Exception No. 2: For direct current motors operating from a flttings shall be located so that the equipment grounding rectified single-phase power supply, the conductors between the conductor may be terminated either inside or outside the motor controller and the motor shall have an ampacity of not less than terminal housing. the following percent of the motor full-load current rating: SUBSTANTIATION: Termination fittings for grounding conductors a. Where a rectifier bridge of the single-phase half-wave are not provided in motor terminal housings. Use of the cap type is used, 190 percent. screws that fasten the motor terminal housing to the motor is a b. Where a rectifier bridge of the single-phase full-wave violation of Section 250-i14(a). Th~ connection device or type is used, 150 percent. fitting should be installable for use inside or outside the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. motor terminal housing. This would then be compatible with the permissive methods of Section 250-79(e) Installation-Equipment Bonding Jumper. PANEL RECOMMENDATION: Accept as Revised: 430-Part C: Accept CMP 11 (e) Equipment Grounding Connections. A means for connection SUBMITTER: A. P. White, Attleboro, MA of an equipment grounding conductor in accordance with Section PROPOSAL: 22 Revise Part C Title as follows: 250-113 shall be provided at motor terminal housings for ~tor and Branch Ciruit Overload Protection. wire-to-wire connections or fixed terminal connections. The SUBSTANTIATION: See A. P. White substantiation for proposal for means for such connections shall be permitted to be located Diagram 430-1. either inside or outside the motor terminal housing. PANEL RECOMMENDATION: Accept. Exception: Where a motor is installed as a part of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. factory-wired equipment, which is required to be grounded and without additional connection being required at the motor terminal housing during equipment installation, a separate means for motor grounding at the motor terminal housing shall not be 436-32 (a)(1): Accept CMP 11 required. SUBMITTER: A. P. White, Attleboro, NSA VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I~-R-O-FD-S-A-[-[." 23 In the last paragraph, delete the words "motor-running" and replace with the word "motor." SUBSTANTIATION: See A. P. White substantiation for proposal for U1agram 430-1. 430-14(a): Reject CMP 11 PANEL RECOMMENDATION: Accept. SUBMITTER: O. E. Dillon Border County Div. IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 19 Revise as follows: ~entilation and Maintenance. Motors shall be accessible to facilitate maintenance, such as lubrication of bearing and replacing of brushes can be readily accomplished. Ventilation 430-32(b): Accept CMP 11 will be sufficient to prevent the temperature rise of the motor SUBMITTER: Roger C. Troupe, Fremont, NB from exceeding that temperature for which the motor is rated. ~24 Amend section title to read: One Horsepower or SUBSTANTIATION: The use of the words "adequate" and "readily" ~nautomatically Started. render thls section legally unenforceable. See the attached SUBSTANTIATION: Section (b) is designed to be more lenient in opinion of the San Diego City Attorney. respect to the overload protection of motors, one horsepower or *See Border County Div. IAEI substantiation for CMP 1 Proposal less, not permanently installed, and within sight from the No. go for 110-16(a). location of the person starting them. Emendation of the wording • PANEL RECOMMENDATION: Reject. in the manner shown will make it specifically understood that PANEL COMMENT: No significant contribution to safety would paragraph (b) concerns motors started by personal intervention, result. not just those started by a manual-type controller. (Note: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 195 NONAUTOMATIC, as defined in Article 100.) Additionally, it will Motors with marked service factor make clear that Sections (b) and (c) outline the required not less than 1.15 ...... 140 percent overload protection on all continuous-duty motors rated one Motors with a marked temperature rise horsepower or less. not over 40°C...... 140 percent PANEL RECO~IENDATION: Accept. All other motors ...... 130 percent VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: See related proposals for Section 430-7(a), motor namepTate marking, and for Sect!on 430-40, overload relay marking. Section 430-34 as presently written states that "the overload 430-32(b)(1), Exception: Accept CMP 11 device shall have sufficient time delay to permit the motor to SUBMITTER: TSC-Nominal Voltage start and accelerate its load" without providing any means for a 25 Change"125 volts" to "127 volts" user to select an overload relay to meet this requirement. The ~UU$1ANIIATION: To conform to the guidelines established by the control industry in NEMA Standard Part ICS 2-222 and a TSC on Nomlnal Voltages. nationally recognized testing laboratory in ANSI C33.76-1976 PANEL RECOMMENDATION: Accept as Revised: provide class designations as a way of indicating the time I "Any such motor shall be permitted on a nominal 120 volt available for the motor to accelerate its load to rated speed. branch circuit protected at not over 20 amperes." When a user selects the next higher size overload relay of a VOTE ON PANEL RECO!~ENDATION: Unanimously Affirmative. lower class designation rather than one with a lower ratio of trip ~current to motor full-load current, he sacrifices protection unnecessarily. By taking full advantage of an existing class designation system, the user can provide 430-32(d): Accept CMP 11 sufficient time for this motor and load to accelerate and still SUBMITTER: A. P. White Attleboro, MA retain the best running overcurrent protection. , ~ 26 Deletethe word "running." For example, if a Class 10 overload relay selected in ~!~'ARTIATION: See A. P. White substantiation for proposal for accordance with Section 430-32 does not provide sufficient time Diagram 430-1. for a service factor 1.0 motor to accelerate, present Section PANEL RECOMMENDATION: Accept. 430-34 raises the maximum permissible overload relay trip VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. current from 115 percent to 130 percent of motor full-load current. If the load inertia is within that specified for the motor (as it should be) then the fault lies with the overload relay and it must be changed. Howeverby changing to a higher 430-34: Reject CMP 11 class designation rather than a higher trlp current, the user SUBMITTER: Charles B. Kish, The Travelers Insurance CoL can bring his motor up to speed and still retain 115 percent l~TOI~S'AL-~.27" Delete the reference to "Section 430-32 (a)(1)." protection. Typical insulation life for a Class B insulated ~]I~:'~TI'IATION: While I agree that for motors of one horsepower service factor 1.0 motor when operated at 115 percent of motor or less as referred to in Section 430-32 (c)(1) the higher full-load current is 5,000 hours compared to go0 hours when overload relay trip settings may be necessary due to heater operated at 130 percent of motor full-load current. sizes available, and possibility of a serious accident is not The ~lass designation system for overload relays provides for great; the use of oversize heaters on motors over one horsepower motor acceleration without sacrificing running overcurrent referred to in section 430-32 (a)(1) is unwarranted and protection and should be used to reduce motor burnout, a dangerous. The ~ount of destructive power available in the significant cause of electrical fires. larger motors, is much greater. This danger is further PANEL RECOMMENDATION: Reject. compounded if used in a three phase circuit and single phasing PANEL COMMENT: Proposal is primarily a design consideration. is caused by one line opening. ~RECOMMENDATION: Unanimously Affirmative. 'PANEL RECOMMENDATION: Reject. PANEL COMMENT: No evidence to support the suggested change. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 15. 430!35{a): Accept CMP 11 NEGATIVE: Gubany, Kish. SUBMITTER: A. P. White, Attleboro,'MA EXPLANATION OF VOTE: PROPOSAL: 29 Deletethe word "running" in line 2. GUBANY: I am voting negative on Panel rejection as I agree ~]B'~FA-N-I~IATION: See A. P. White substantiation for proposal for with the author's supporting comments. With the ever decreasing Diagram 430-1. size and thermal capacity of motors, it is more important than PANEL RECOMMENDATION: Accept. ever that.motors be protected at values closer to their name VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. plate ratings. KISH: Based on my original substantiation remarks for this proposal that I submitted -- "While I agree that for motors of one horsepower or less as referred to in Section 430-32(c)(1) 430-35(a): Accept CMP 11 the higher overload relay trip settings may be necessary due to SUBMITTER: Roger C. Troupe, Fremont, NE heater sizes available, and possibility Of a serious accident is PITO-I~]~-~.'30 Amend section to read: Nonautomatically not great; the 'use of oversize heaters on motors over one For a nonautomatically started motor, the running horsepower referred to in Section 430-32(a)(1) is unwarranted overload protection may be shunted or cut out of the circuit and dangerous. The ~ount of destructive power available in the during the starting period, cut out cannot be left in the larger motors is much greater. This danger is further starting position and if fuses or inverse time circuit breakers compounded if used in a three phase circuit and single phasing rated or set at not over 400 percent of the full-load current of is caused by one line opening." In addition I feel that when the motor are so located in the circuit as to be operative larger heaters have to use it indicates a misapplication of the during the starting period of the motor. motor and we should not exceed the normal ,heater s~ze in order SUBSTANTIATION: Substitution of the word, nonautomatlcally, for to compensate for thls error. manually In both instances makes it readily understood that Sections (a) and (b) are integral. It also allows the elimination of the explanatory sentence in parentheses which reads "including starting wlth a magnetic 430-34: Reject CMP 11 starter having pushbutton control," as the word nonautomatic SUBMITTER: Marvin T. Stevens, Greendale, WI already has that meaning by the definition given it in Article l~TOl~O~FA1-~.• 28 100. Selection of Overload Relay.. PANEL RECOMMENDATION: Accept as Revised: (a) Class Designation. If not shunted during the starting In third line remove "running" and replace "may" with "shall period of the motor as provided in Section 430-35, the class be permitted to." designation of the overload relay selected in accordance with In the 4th line replace the comma with "of the motor if the Sections 430-32(a)(1) and 430-32(c)(I) shall not exceed the device by which the overload protection is shunted or." maximum overload relay class shown on the motor nameplate. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Fine print note. See Section 430-40 for definitions. (b) Maximum Protection Rati'oL Where the overload relay selected in accordance with Section 430-32(a)(1) and 430-32(c)(1) is not sufficient to start the motor and accelerate 430-35(b): Accept CMP 11 the load, an overload relay with a higher class designation SUBMIT-rER: A. P. White, Attleboro, MA shall be used, provided the conditions of Section 430-34(a) are !~TOIR~'A-L-~.31 Deletethe word "running" in line one. met. Where the overload relay of the highest permissible class ~:[]I~'TA]TTIATION: See A. P. White substantiation for proposal for is not sufficient to start the motor or to carry the load, the Diagram 430-1. next higher size overload relay of the highest permissible class PANEL RECOMMENDATION: Accept. as shown on the motor nameplate shall be permitted to be used, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. provided the rating (trip current) of the overload relay does not exceed the following percentage of motor fu11-1oad current rating:

196 430-37: Accept CMP 11 EXPLANATION OF VOTE: SUBMITTER: A. P. White, Attleboro, MA CANNADY: I wish to register my vote negative on Proposal No. .l~ArOPO-S'AL-~.32 Deletethe word "running" In line 2. 37 since this would require a marking that is presently ~'T;~ITTIATION: See A. P. White substantiation for proposal for permitted. It should not be required at this time since It will Dlagram 430-I mislead those in the field and become a requirement for PANEl. RECOMMENDATION: Accept. inspection where It is intended only to supply information. VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. MIERENDORF: Proposal No. 37 deals wlth the important subject of component coordination with. short circuit protective devices under short circuit conditions. Information regard!ng 12t and I~ let-through values for Table 430-37: Accept CMP 11 short circuit protectlve oevlces ?or a range m values of short SUBMITTER: A. P. White, Attleboro, MA- circuit currents is not yet available. I IJRUPUbAL: 33 Deletethe word "running" in the title. Because of application problems inherent when information is ~'IIb-S"FAI~rIATION: See A. P. White substantiation for proposal for incomplete, this proposal is not yet appropriate for inclusion Diagram 430-I. in the Code. PANEL RECOMMENDATION: Accept. WHITE: Such practice is not prohibited by the present Code VOTE ON PANEL RECOP~IENDATION: Unanimously Affirmative. and application problems are involved which make this proposal inappropriate for the NEC. WOOD: This proposal should be rejected as thls practice is not presently prohibited by the Code. It is improbable that the 430-38: Accept CMP 11 installer will have suf~iclent information at the Job-slte to SUBMITTER: A. P. White, Attleboro, MA properly implement this type of requirement. ~ 34 Deletethe word "running" in line 2. I ~Jl]~TTA]~I'IATION: See A. P. White substantiation for proposal for Diagram 430-1. PANEL RECOMMENDATION: Accept. 430-40: Reject CMP 11 VOTE ON PANEL RECOMI~ENDATION: Unanimously Affirmative. SUBMITTER: Marvin T. Stevens, Greendale, WI VKUVU3AL: 38 Revise as follows: ~F~J-O'z2RT~-.Thermal Cutouts and Overload Relays. (a) Protection. Thermal cutouts, overload relays, and other 430-39: Accept CMP 11 devices for motor-running overload protection that are not SUBMITTER: A. P. White, Attlebo'ro, MA J capable of opening short circuits shall be protected by fuses or ~ 35 Deletethe word "running" in line 2. circuit breakers with ratings or settings in accordance with I ~S'~'A]~TIATION: See A. P. White substantiation for proposal Section 430-52 or by a motor short-circuit protector In for Diagram 430-I. accordance with Section 430-52. PANEL RECO~HENDATION: Accept as Revised: Exception No. I: Where approved for group installation and I Also delete "Running" in title. marked to indicate the maximum size of fuse or inverse time VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. circuit breaker by which they must be protected. Exception No. 2: The fuse or circuit breaker ampere rating shalI be permitted to be marked on the nameplate of approved equiI~nent in which the thermal cutout or overload relay is used. 430-40: Accept CMP 11 For instantaneous trip circuit breakers or motor short-clrcuit SUI~HITT£R: A. P. White, Attleboro, MA protectors, see Section 430-52. ~ 36 Deletethe word "running" in line 2. (b) Overload Relay Class Designation. An overload relay, or I ~'UI~'A]~IATION: See A. P. White substantiation for proposal for the current element selection table that is provided where the Diagram 430-1. overload relay includes replaceable current elements (heaters), PANEL RECOMMENDATION: Accept. shall be marked with its class designation. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Fine print note. Definition: The class designation of an overload relay is a number that indicates the maximum time (In seconds) in which the overload relay will function when carrying a current equal to 600 percent of its current rating. 430~40: Accept CMP 11 Fine print note. Definition: The current rating of an SUBMITTER: Kenneth L. Paape, Allen-Bradley Co. overload relay is the minimum value of continuously applied !~TOPO'S'At-~. 37 Add a new paragraph as follows: current that is expected to cause all like relays to function overload relays shall be marked with their (trip) under designated conditions. This value, for an short-circuit, withstand rating. Where a current element individual relay, may equal or exceed its ultimate trip current selection table is furnished with the overload relay, showing under these conditions. the current element short-circuit withstand ratings (or a method SUBSTANTIATION: Related proposals have been submitted (I) to for determining them) on the table shall be permitted. revise Section 430-34 to provide the means by which a user SUBSTANTIATION: Section 110r10 requires those components that selects the overload relay that has "sufficient time delay to do not play an active role in clearing a short-circuit to have a permit the motor to start and accelerate the load" and (2) to short-circuit withstand rating which must be considered in add a maximum overload relay class designation to the motor selecting an overcurrent device. Manufacturers of thermal nameplate (430-7(a)). All three proposals should be considered overload relays can measure or calculate the amount of energy as a package. that each current element can absorb without burnout under The overload relay class designation system offers a way to short-circuit conditions in order to qualify for listing by a provide better running overcurrent protection for motors without nationally recognized testing laboratory (i.e., select the increasing manufacturing or installation costs. proper fuse for short-circuit testing). This energy is equal to PANEL RECOMMENDATION: Reject. the resistance of the thermal element multiplied by the I2t PANEL COI~IENT: Proposal is primarily a design consideration. let through by the fuse under short-circuit conditions. Hence VUIL ON PANtL RECOMMENDATION: Unanimously Affirmative. the short-circuit withstand rating of the current element can be expressed in terms of 12t. Seme overload relay current elements designed foF low full load motor currents (wire coil type) can also be destroyed by the mechanical effect of high 430-41-(New): Reject CMP 11 fault currents, Ip. For such designs a maximum Ip withstand SUBMITTER: Kenneth L. Paape, Allen~Bradley Co., Milwaukee, WI rating would also have to be specified. PROPOSAL: 39 Add new section as follows: Users of motor control equipment have indicated to us that ~. Overload Relay Classes. Overload relays or short-circuit withstand ratings ought to be furnished with the controllers which include overload relays shall be marked with overload relay so that those who wish to protect current their class designation. Where a current element selection elements from burnout under short-circuit conditions have the table is furnished with the overload relays, showing the class information required to do so., They would install short circuit designation on the table shall be permitted. protective devices that limit the 12t and Ip to not more than SUBSTANTIATION: For many years Underwriters Laboratories had a the withstand ratings of the overload relays. L~sted short performance requirement in their standard for Industrial Control circuit protective devices are available to provide this level (UL503) that required each overload relay to trip at 600 percent of protection. of its current rating within 30 seconds. The current rating of Standards' presently used by nationally recognized testing an overload relay is that current which when continuously laboratories "permit listing of controllers with overload relays applied to the relay will ultimately cause it to trip. For a that burn open and cause arcing under short-circuit conditions. motor having a service factor of 1.0, the minimum ratio of relay Merely complying with the Code or the information furnished with rating to motor full load current permitted by Section 430-32 is the overload relay does not provide the user with sufficient 115 percent. Control manufacturers provide a table which information to protect his current elements from burnout if he permits the installing electrician to select an overload relay considers such protection essential. A standard method of element and automatically comply with this requirement. designating the short-circuit rating of thermal overload relays When T-frame motors became a major factor in industrial is required so that manufacturers of short-circuit protective applications, Underwriters Laboratories changed the performance devices can respond in like terms. standard to 20 seconds. In order to maintain a UL listing, PANEL RECOMMENDATION: Accept. control manufacturers then had to show that their overload V~TE ON PANEL RECOMMENDATION: relays responded in not more than 20 seconds to a current equal AFFIRMAIIVE: 13. to 600 percent of the overload relay rating. This change was to NEGATIVE: Cannady, Mierendorf, White, Wood. 197 match the reduced thermal overload capability of T-frame (2) Do not exceed device marking. motors. Too many motors were burning out under locked rotor (3) Individual running overload protection conforms to Section conditions with the 30 second maximum overload relay design. 430-52. Concurrently motor manufacturers recognized that some of their However, 430-42(a) states that you Just have to apply rule (1) motors, particularly those associated with air conditioning and and (2) (as listed above) but not (3). This is a direct refrigeration equipment had even shorter permissible locked conflict. Also the overload protection as stated in Section rotor time and they demanded from the control industry a line of 430-52 is essential and clearly defined in the code. overload relays that were called "Fast Tripping." Meanwhile, B. Section 430-42(b) basically restates rule 430-53(a)3, and original equipment manufacturers and industrial users who had therefore is unnecessarily redundant, and should be eliminated. high inertia loads attached to their motors realized that very C. Summary: often the new 20 seconds maximum overload relay was too fast and 1. Eliminate Section 430-42(a). would trip out before the motor and its high inertia load came 2. Eliminate Section 430-42(b). up to speed. They needed a line of "Slow Tripping" overload 3. MoveSection 430-42(c) and (d) to 430-53. relays. PANEL RECOMMENDATION: Reject. A few years ago Underwriters Laboratories, in conjunction with PANEL COMHENT: The Panel does not agree with the supporting representatives of the control industry, developed the concept comment. of class designations for overload relays. These class VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. designations are in the NEMA Standard for Industrial Control (ICS-1970) and UL508. The essence of the class designation is the maximum time (in seconds) in which the overload relay must operate when subjected to a current equal to 600 Rercent of its 430-42(b): Accept CMP 11 current rating. The end result is that Class 10, Class 20, and SUBMITTER: A. P; White, Attleboro, MA Class 30 overload relays are available'in today's marketplace. ~42 Delete the word "running" in lines 3 and 5. .Any one of them can be used for a given full load motor ~]]~?r~I~rIATION: See A. P. White substantiation for proposal for current. Thus for any one motor full load current a user can Diagram 430-I. select any one of 3 relays, each with the same current rating, PANEL RECOMMENDATION: Accept. but a different class des4gnation. Under continuous overload VOTE ON PANEL RECOMMENDATION: Unanimously AfFirmative. conditions all 3 relays will ultimately trip at the current equal to their common rating, but their response time to a locked rotor or a longer start period is dramatically different. Attached are the time-current characteristics of the 3 classes 430-42(c): Accept CMP 11 of relays, each having the same maximum ultimate trip SUBMITTER: A. P. White, Attleboro, MA characteristic permitted under Section 430-32 for a service ~43 Delete the word "running" in lines 3 and 8. factor 1.0 motor. Also shown on the attachment is a tabulation I ~I]ITS'FAITTIATION: See A. P. White substantiation for proposal for of the marked decrease in insulation life as a result of Diagram 430-1. subjecting the motor windings to overtemperature. Note that PANEL RECOMMENDATION: Accept. curren~ is expressed as multiples of motor full-load current, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. not mu~tlples of relay ratings. Section 430-34 recognizes the problem of bringing a motor and its associated high inertia load up to speed by permitting an increase in the protection factor under such conditions to 130 430-43: Accept CMP 11 percent of motor full-load current for a service factor 1.0 SUBMITTER: A. P. White, Attleboro, MA motor. We believe that there is less danger of motor burnout PROPOSAL: 44 Delete the word "running" in llne one. and hence a reduced fire hazard if instead of moving to an ~'I]I~'II~'FIATION: See A. P. White substantiation for proposal for overload relay with higher ultimate trip current as provided by Diagram 430-1. Section 430-34, the user would select a higher class designation PANEL RECOMMENDATION: Accept. overload relay. In this way he could obtain more locked rotor VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. time without sacrificing protection under running conditions. We felt that the way to start was to add class designations for overload relays in 2 places in the Code; first a new section proposed as 430-41, secondly under motor marking requirements 430-51: Accept CMP 11 (430-7). We felt that motor manufacturers and manufacturers of SUBMITTER: CMP 11 motor ~iven equipment would both know the overload capability PROPOSAL: 44A Add a new sentence between second and third and inertia of their equipment and thus be the most qualified to ~s of the first paragraph reading: "The devices select the class of overload relay that provides optimum specified in Part D do not include the types of devices required protection for the motor and yet precludes the nuisance tripping by-Sections 210-8 and 230-95." which necessitated Section 430-34. It was our hope that once SUBSTANTIATION: Officlal Interpretation No. 75-1. proposals such as we have submitted for Sections 430-7(a) and PANEL RECOMMENDATION: Accept as Revised: 430-41 were incorporated Into the Code, consideration could be In Section 430-51, add a new sentence after the second given to modifying Section 430-34 in some way so as to solve the sentence of the first paragraph reading: "The devices specified problem of nuisance tripping without sacrificing running in Part D do not include the types of devices required by overcurrent protection. Sections 210-8 and 230-95. PANEL RECOt~MENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: The CMP believes that'extending the requirements as indicated by this Proposal is not necessary as the Code now permits this marking. VOTE ON PANEL RECOMMENDATION: 430-52: Accept CMP 11 AFFIRMATIVE: 15. SUBMITTER: A. P. White, Attleboro, MA NEGATIVE: Lopez, Schram. ~45 Delete the word "running" in lines 2 and 7. EXPLANATION OF VOTE: 5UBSrANIIATION: See A. P. White substantiation for proposal for LOPEZ: See Comment on Proposal No. 8. Diagram 430-I. SCHRAM: See explanation of negative vote on Proposal No. g. PANEL RECOMMENDATION: Accept as Revised: I believe this proposal should be accepted with a revision to Delete the word "running" in lines 2 and 7 of the second add a definition of the overload relay class designation, such paragraph only. In thSrd paragraph, line I, and in last as the first fine print note included in Proposal No. 38, paragraph, line 1, insert the words "short-circuit and Section 430-40. ground-faul't" after the words "branch-circuit." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

430-42(a): Accept CMP 11 SUBMITTER: A. P. White, Attleboro, MA ~30-52: Accept CMP 11 .~40 Delete the word "running" in line 2. SUBMITTER: TSC-Approved for the Purpose ~'I~s'rAI~rFIATION: See A. P. White substantiation for proposal for PROPOSAL: 46 See the Technical Subcommittee "Recommendations" Diagram 430-I. under the definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept. 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: In secona paragraph in lines 3 and 4 and also lines g and 10 430-42(a) and (b): Reject CMP 11 (2 places) delete "and if the combination is especially approved SUBMITTER: Warren Anderson, Mount Vernon, WA for the purpose"; insert "and" in place of comma in line i; PRUPOSAL: 41 Delete430-42(a) and (b) and relocate (c) and (d) insert "and" between "conductor" and "if" in llne 8; add new ll-6-S'-6~-Ton 430-53. sentence at end of paragraph, "An instantaneous trip circuit SUBSTANTIATION: breaker or motor short-circult protector shall be used only as A. 430-4Z{a} and (b) should be eliminated as it directly part of a combination motor controller which provides contradicts 430-53(a) and (b). 430-53(a) states three rules coordinated motor branch circuit overload and short-circuit and that motors under I HP must follow. They are: ground-fault protection." (1) Maximum FLC = 6 amps. Make the following additional changes in Section 430-52. 198

\ (I) Delete third paragraph and make wording of third c.b. (430-52 ex: c). There isn't any upper limit specified for paragraph Exception No. 1 to first paragraph. Delete Exception the other means of branch circuit protection. under existing third paragraph and rearrange as new Exception In the overload range, overload relay curves better duplicate No. 2 to first paragraph, as follows: °Exception No. 2: Where motor damage curves and thus can be adjusted to trip sooner and the rating specified in Table 430-152 is not sufficient for the provide increased protection. starting current of the motor: a. (same as (a) of existing By allowing the instantaneous trip circuit breaker or motor Exception}. b. (same as (b) of existing Exception). c. (same short circuit protector to be applied separate from the as (e) of existing Exception). d. (same as (f) of existing co{nblnation controller, branch circuit short circuit and ground Exception). ~ Make new Exception No. 3 to first paragraph, same fault protection will be provided by these devices, while as Item (d) of existing Exception. Make new Exception to second overload protection wlll be provided by the heaters, which are paragraph as follows: "Exception: Where the setting specified at the load end of the branch circuit. There shouldn't be in Table 430-152 is not sufficient for the starting current of concern over the protection of the conductors as other sections the motor, the setting of an instantaneous trlp circuit breaker of the Code allow up to 25 ft. of unprotected feeder taps, with shall be permitted to be increased but shall in no case exceed protection at the load end. 1300 percent of the moto~ full-load current. ~ PANEL RECOMMENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: The evidence submitted is inconclusive. vuIt ON PANEL RECOI~ENDATION: Unanimously Affirmative.

430-52: Accept CMP 11 SUBMITTER: Joseph L. Yosafat, General Electrlc Co. 430-52: RejeCt CMP 11 ~47 Add a new paragraph at end of 430-52 as follows: SUBMITTER: Claude E. Deering, Jr., American Petroleum Institute "--S"~Tt-~b-le fuses shall-be permitted in lieu of devices listed in PRDPOSAL: 49 Delete the words "and ground-fault" in the first Table 430-152 for an adjustable speed drive system provided that paragraph and in 'two places in the second paragraph. the marking for replacement fuses is provided adjacent to the SUBSTANTIATION: The wording of Section 430-52 in the 1978 Code fuses. Is the same as in the 1975 Code. It was changed editorially SUBSTANTIATION: Fuses now recognized by the Code for short from the 1971 Code, and the words "and ground fault" were added circuit protection for adjustable speed drives provide in three places. The present wording can be interpreted to inadequate protection for the drive semiconductors. As require special ground-fault protective devices in each motor semiconductors have very small thermal capacities, very fast branch circuit. acting energy limiting fuses are ~equired. Official Interpretation No. 75-I, dated February 18, 1975, These same fuses provide adequate short circuit protection for stated that it was not the intent of Section 430-52 of the 1975 other devices in the branch circuit as these other devices have Code to require any form of ground-fault protective device larger thermal capacities as demonstrated by short circuit beyond that provided by the motor branch-circuit overcurrent tests. These fuses are used only for short circuit protection device specified in Article 430-52 of the 1971 Code. It is and are coordinated with other approved means for providing recommended that specific references to ground fault protection overcurrent protection in.the adjustable speed drive system. be eliminated from Section 430-52 to clarify the meaning, in Marking wlll assure that the replacement fuses provide the fast line with Official Interpretation No. 75-1. protective action required. PANEL RECOi~ENDATION: Reject. PANEL RECOMMENDATION: Accept as Revised: PANEL COMMENT: See action on Proposal No. 44A. Add a new paragraph at the end of 430-52 as follows: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. For an adjustable speed drive system, special purpose fuses for protection of semiconductors shall be permitted in lieu of devices listed in Table 430-152, provided that: (a) The fuse(s) is part of a controller having motor overload 430-52, Exception Nos. 2 and 3: Reject CMP 11 and also short-circuit and ground-fault protection in each SUBMITTER: Kenneth L. Paape, Allen-Bradley Co. conductor. ~50 Add new exceptions as follows: (b) The combination provides coordinated motor branch circuit Exce~ion No. 2: Where the motor full-load current is less overload and short-circuit and ground-fault protection, than 3.75 amperes in a polyphase motor circuit and the motor (c) Marking for.replacement fuses is provided adjacent to the / controller includes motor-running overcurrent protection in each fuses. conductor, an adjustable instantaneous trip circuit breaker, not VOTE ON PANEL RECOMMENDATION: as part of a combination motor controller, shall be permitted to - AFHRMATIV~: 16. serve as the short-circuit and ground-fault protective device, NEGATIVE: White. providedthe length of the conductors between the instantaneous EXPLANATION OF VOTE: trip circuit breaker and the motor controller does not exceed 25 WHITE: Thls proposal should be rejected because it is feet, and the conductors are suitably protected from physical incomplete and confusing. The proposed format is faulty where damage. it does not include a requirement for maximum permissible fuse Exception No. 3: Where the motor full-load current is' less rating as is done for all the other items in Section 430-52. than 3.75 amperes in a polyphase motor circuit, the rating of an Additionally, there is no reason to limit this proposal ~o a inverse tlme circuit breaker shall not exceed 400 percent of the controller having overload and short circuit and ground fault full-load current. protection if the same limitations on fuse rating apply as for SUBSTANTIATION: Section 430-52 requires that the setting of an nontime delay fuses in Section 430-52 and Table 430-152, since instantaneous trip circuit breaker shall in no case exceed 1,300 to do so would prevent the use of other forms of overload percent of motor full load current. Hence the worst case protection permitted in Section 430-32. The proposal woul~ condition permitted by Exception No. 2 proposed above would be therefore become unnecessarily restrictive and mandate the an instantaneous trip circuit breaker set for 48.62 amperes to addition of one form of protection even though other acceptable protect a motor with ~ full-load current of 3.74 amperes, Where protection was provided. It was indicated during Panel the full-load current is less than 3.74 amperes, the maximum discussion that the maximum fuse rating could be specified to be permissible trip s~tting is proportionally less. Motor circuit the same as for nontime delay fuses; the original proposal conductors for motors having a full-load current of less than should be restored with the nontime delay fuse rating limitation 3.75 amperes have ampacities not less than 15. (Table 310-16 added. specifies 15 as the minimum ampacity of #14 AWG wire and 21 as the ~npacity of #18 AWG wire, the latter shown only for 90 degrees Celsius insulation.) The current elements (heaters) for overload relays usually 430-52: Reject CMP 11 used to provide motor running overcurrent protection in SUBMITTER: J. CannateITi, Gould Inc. polyphase motor circuits have a resistance inversely 48 Changethe wording of paragraph 2 to read: proportional to the square of their current rating. Thus the ~tantaneous trlp circuit breaker shall be used only if lower the motor full-load current, the higher the resistance of a~justable and motor-running overload protection is provided in the current element. each conductor. A motor short circuit protector shall be The smallest standard rating of an inverse time circuit permitted in lleu of devices listed in Table 430-152 if breaker is 15 amperes. Inverse time circuit breakers rated 15 motor-running overload protection is provided in each conductor amperes trip instantaneously at approximately 105 amperes or and if it will operate at not more than 1300 percent of- more, full-load motor current. As the resistance of the current elements in the circuit SUBSTANTIATION: This would remove the restriction that increases, the magnitude of any fault which can be produced on instantaneous trip" type circuit breakers and motor short circuit the load side of the elements decreases to.the point where if a protectors need to be in a combination controller. It will short-clrcuit occurs in a 240 volt system supplying a motor with allow both types of devices to be fully UL listed as opposed to a full-load current of one ampere or less, the maximum being Recognized Components, and be applied as separate devices. fault current is not sufficient to activate the instantaneous The time'current curve represented by an overload relay and trip mechanism of an inverse time circuit breaker, r~gardless of either the instantaneous c.b. or motor short circuit protector the short-circuit current available at the line terminals of the provides greater protection for a motor and its branch circuit circuit breaker. For every supply voltage and any fault current conductor than the allowed settings or ratings of inverse time available at the circuit breaker line terminals, there is some c.b. or non-time delay or time delay fuses. overload relay current element appropriate for the motor Both the instantaneous c.b. and the motor short circuit• full-load current where there is no instantaneous tripping protector have NEC specified high fault limits - 1300% for motor action by'a 15 ampere inverse time circuit breaker possible, short circuit protectors (430-52) and 1300% for instantaneous. because of the element's resistance. A fault current greater 199 than 1,300 percent of motor full-load current that is not 430-53(b): Accept CMP 11 sufficient to trip an inverse" time circuit breaker SUBMITTER: A. P. White, Attleboro, MA instantaneously subjects the overload relay element to a current ~54 Delete the word "running" in line 4. beyond its limit of self protection and the element burns open I ~I]ITS'TAI~FIATION: See A. P. White substantiation for proposal for before the inverse time portion of the circuit breaker can cause Diagram 430-1. the breaker to trip. When the current element burns open it PANEL RECOMMENDATION: Accept as Revised: arcs and usually causes a new short-circuit within the Add to proposal - In line 1 and line 6 insert the words controller enclosure. This second short-circuit is now not "short-circuit and ground-fault" after the words limited by the resistance of the current element and the circuit "branch-circuit." breaker now responds instantaneously, but only after the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. overload relay has been severely damaged. Adjustable instantaneous trip circuit breakers rated less than 15 amperes are commercially available, some with trip settings as low as 7 amperes. By using instantaneous trip circuit 430-53(c): Accept CMP 11 breakers in lieu of inverse time circuit breakers in motor SUBMITTER: A. P. White, Attleboro, MA circuits where the full-load current is less than 3.75 amperes, PROPOSAL: 55 Delete the word "running" in lines 2 and 3. immediate instantaneous trip action by the circuit breaker can ~I]I~TTTI]TTIATION: See A. P. White substantiation for proposal for be obtained. The risk involved in having up to 25 feet of Diagram 430-1 conductors between a separately mounted instantaneous trip PANEL RECOMMENDATION: Accept. circuit breaker and its associated motor controller protected VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. against short circuit and ~round faults at not mere than 324 percent of their mnpacity tworse case is 48.62/15 : 3.24} is less than the 333 percent permittedfor transformer feeder taps by Exception No. 8 under Section 240-21.. 430-53(c)(1): Accept CMP 11 The wording of proposed Exception No. 3 is such that it should SUBMITTER: A. P. White, Attleboro, MA encourage development and availability of polyphase inverse time PROPOSAL: 56 Delete the word "running" in line one. circuit breakers that are rated less than 15 amperes and have ~'UI~S'TAITTIATION: See A. P. White substantiation for proposal for time versus current-to-trip characteristics lower than those for Diagram 430-I. - inverse time circuit breakers rated 15 amperes. When such PANEL RECOMMENDATION: Accept. circuit breakers are available, they could be recognized as VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. standard sizes in Section 240-6. Note that this proposal would not restrict the use of 15 ampere inverse time circuit breakers in single phase motor circuits. 430-53(c)(3): Reject CMP 11 PANEL RECOMMENDATION: Reject. SUBMITTER: Alton R. Thompson, Durham, NC PANEL COMMENT: Present requirement is necessary. The Panel ]~-O-PO-~'A-L-~." 57 Revise as follows: belleves that extending the requirements as intended by this ~ach circuit breaker is.of the inverse time type and, if Proposal is not appropriate at this time. rated more than 60 amperes, 'Is approved for group installation. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: When fuses are required, especially on resldent~al a/c units, a raintight pull out or a raintlght switch is used. With a raintight pull out a child can put a screwdriver or a small piece of conducting material into the 430-52, Exception No. 2-(New): Reject CMP 11 pull out and get a lethal shock. With a raintlght switch a SUBMITTER: Idaho Chapter IAEI child can get his whole hand in the switch and get a lethal 51 In Section 430-52 change "Exception" to shock. We are trying to protect small component parts and ~l~-~-~-t-fon No. i." Add a new Exception No. 2. forgetting our small friends who do not know any better than to Exception No. 2: The values given in Table 430-152 shall not open a lid on a switch. In my own experience of 10 years of apply to adjustable speed drive motors when the power conversion electrical contracting and specializing in air conditlon.and equipment provides overload protection for the motor. refrigeration inst~llations, I used inverse time circuit Additional protection is not then required. breakers with desirable results. SUBSTANTIATION: Section 430-52 does not address short-circuit PANEL RECOMMENDATION: Reject. and ground-fault protection for the branch circuits of D.C. PANEL COMMENT: Supporting comment is not persuasive as to motors on the load side of power conversion equipment for . necesslty. adjustable speed drives. Section 430-2 Adjustable Speed Drive VOTE ON PANEL RECOMMENDATION: Systems in the first paragraph, second sentence, gives much AFFIR~t~TIYE: 14. inferred requirements. This sentenceshould be deleted from NEGATIVE: Cannady, White. Section 430-2 and moved to Section 430-52 where it belongs. In NOT VOTING: Aquilino. the field some manufacturers of adjustable speed drive equipment EXPLANATION OF VOTE: are providing neither overload or short-clrcuit and ground-fault AQUILINO: Conslderable test data has been presented both for protection for the D.C. motors and branch circuit conductors. and ~gainst this proposal. In view of the conflicting data, and This requirement should b~ clarified in the proper section of lacking the facilities to confirm the test results myself, I do the Code. not feel there is sufficient Justification for either an PANEL RECOMMENDATION: Reject. affirmative or negative vote at 'this time. PANEL COMMENT: See Panel's action on Proposal Nos. 5 and 47, CANNADY: I vote against rejecting this Proposal because we Sections 430-2 and 430-52. have seen very strong evidence that circuit breakers are doing a VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. better Job than fuses in limiting current, interrupting and protecting circuits. I feel that to reject this is discriminating against circuit breakers ~nd showing preferential treatment to fuses. 430-53(a): Accept CMP 11 " WHITE: The proposal was shown to be valid by the UL SUBMITTER: TSC-Nominal Voltage Fact-Finding data and information provided to the Panel on I~TO]~-O-~L-T.• 52 Revise the text as follows: performance of circuit breakers and fuses in that the same level "Several motors each not exceeding one horsepower in rating of performance is provided as presently specified. shall be permitted on a nominal 120 volt branch circuit protected at not over 20 amperes or a branch circuit of 600 volts, nominal, or less protected at not over 15 amperes, if all of the following conditions are met:" 430-53(c)(3), Exception-(New): Reject CMP 11 SUBSTANTIATION: To conform to the guidelines established by the SUBMITTER: R.B. Boyd, Jr., Raleigh, NC TSC on Nominal Voltages. 58 Add exception as follows: PANEL RECOMMENDATION: Accept. ~ion: Each circuit breaker is of the inverse time type VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. and, if rated more than 60 amperes, is approved for group installation. ~q SUBSTANTIATION: For many years we have treated single phase, Z50 volt window air-conditioning units as a single motor load 430-53(a)(3): AcE~pt CMP 11 and permitted branch circuit overcurrent protection to consist SUBMITTER: A. P. WHite, Attleboro, MA of either time limit or inverse time circuit breakers. As far ;I}ITOI~OSAIZ-T. 53 Delete the word "running." as can be determined, field experience using such breakers rated ~]B-S"FAI~I'IATION: ,See A. P. White substantiation for proposal for at 50 amperes and less has been good. If this information is Diagram 430-1. correct, then why not permit the smaller inverse time circuit PANEL RECOMMENDATION: Accept as Revised: breakers to be used on residential and small commercial branch Add to proposal - In paragraph (a)(2) insert the words circuits within the prescribed limits. Also many such fixed "short-clrcuit and ground-fault" after the words installations have been and are being accepted and field reports "branch-clrcuit." do not indicate difficulties resulting from the use of smaller VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. inverse time circuit breakers. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Supporting comment is not persuasive as to necesslty. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

200 430-53(d): Accept CMP 11 20 ampere overcurrent protective device against some high SUBMITTER: A. P. White, Attleboro, HA impedance faults within the overcurrent devices rating or when ~I~TOPO'S'AL-~.sg Deletethe word "running" in line 8. hlgh short-circult currents are available. As written, this SUBSTANTIATION: See A. P. White substantiation for proposal for proposal violates 110-10 and 240-1 of the NEC. Also, circuit Diagram 430-I. transformers cannot be protected by secondary control.circuit PANEL RECOMMENDATION: Accept as Revised: protection. A control transformer should have the same I Add to proposal - In llne 3 insert the words "sho~t-circuit protection in a motor controller enclosure as well as any other and ground-fault" after the words "branch-circuit." enclosure. Control transformers should be protected as required VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in Article 450. Control transformers are a big source of fire since the primary protection is usually much too great to provide any protection.

430-55: Accept CMP 11 SUBMITTER: A. P. White, Attleboro, MA ,I~60 Deletethe word "running" in lines 2 and 4. 430-71(b)-(New): Reject cMP 11 ~:I]I~"~¢~IATION: See A. P. White substantiation for proposal for SUBMITTER: A. C. Clark, Manufacturing Chemists Assn. Diagram 430-1. PROPOSAL: 64 Add new (b) as follows: PANEL RECOMMENDATION: Accept. ~onductor size. Motor control circuit cofiductors shall VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be sized in accordance with Section 310-5. Exception:' Where the motor control conductors are smaller than No. 14, the provisions of Article 725 shall apply. SUBSTANTIATION: .To correlate with companion proposal for new 430-59-(New): Reject CMP 11 Exception No. 5 to Section 430-72(a). (See that proposal for SUBMITTER: J. M. Rice, Allen-Bradley Co. additional"substantiation.) Change will also correlate with 61 Add new 430-59 as follows: proposed addition of, Section 725-2(e). ~r~o-:5"~]~-'. Interrupting Rating. Every overcurrent protective PANEL RECOMMENDATION: Reject. device installed in a polyphase motor circuit where the voltage PANEL COMMENT: See action on Proposals Nos. 63 and 65. to ground exceeds 250 volts shall be marked with an interrupting VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. rating. SUBSTANTIATION: Section 240-83(c) requires that circuit breakers be marked with their interrupting rating only if it is other tha~ 5,000 amperes. Section 240-60(c) requires that fuses 430-72: Accept CMP 11 be marked with their interrupting rating only if it is other SUBMITTER: TSC-Control Circuit Protection than 10,000 amperes. At locations where polyphase power is PROPOSAL: 65 Revise as follows: supplied to motors at 480 and 600 volts there is high ~. Overcurrent Protection. probability that the fault current avallable will exceed 5,000 (a)' General. ,A motor control circuit tapped from the load amperes. Many will exceed 10,000 amperes. side of a motor branch-circuit short-circuit and ground-fault By requiring an interrupting rating to be marked on the protective device(s) and functioning to control the motor(s) , overcurrent protective device there is an automatic reminder to connected to that branch-circult shall be protected against the installer to consider the fault current available at the overcurrent in accordance with Section 430-72. Such a tapped point of installation. Our company is aware of two cases in the control circuit shall not be considePed to be a branch-circuit past year where a serious fault occured in an industrial and shall be permitted to be protected by.either a supplementary application and the overcurrent protective device did not clear or branch-circuit overcurrent protective device(s). A motor the fault successfully. In both cases personnel were injured. control circuit other than such a tapped ~ontrol circuit shall We should not overlook an opportunity to add a requirement to be protected against overcurrent in accordance with Section the Code that will focus attention on the need to have 725-12 or 725-35, as applicable. overcurrent protective devices with interrupting ratings equal (b) Conductor Protection. to or exceeding the fault current available. (1) Conductors larger than No. 14 shall be protected PANEL RECOMMENDATION: Reject. against overcurrent in accordance with their ampacities. The PANEL C~ENT: Panel feels subject is adequately covered. ampacities for control circuit conductors No. 14 and larger VOTE ON PANEL RECOI~MENDATION: shall be those given in Tables 310-16 through 310-19, without AFPIRMJ~IIV~: 16. derating factors, and the limitations of Section 310-1 shall not NEGATIVE: Gubany. "' apply. EXPLANATION OF VOTE: (2) Conductors of Nos. 18, 16 and 14 shall be considered as GUBANY: I am voting negative on Panel rejection since I agree protected by an overcurrent device(s) of not more than 20 with the author's supporting comment. This proposal will amperes rating. enhance compliance with 110-9 and 110-10. Exception No. 1 for (I) and (2} above: Conductors which do not extend beyond the motor control equipment enclosure shall be considered as protected by the motor branch-clrcuit short-circuit and ground-fault protective device(s) where the 430~52(b): Reject CMP 11 rating of the protective device(s) is not more than 400 percent SUBMITTER: Robert J. Cunningham, Duquesne Light Company of the ampacity of the control circuit conductors for conductors l~ITOl}l~TAt-~ 62 Add a second paragraph, requiring numbering No. 14 and larger; or not more than 25 amperes for No: 18 and 40 exlstlng paragraph as follows: amperes for No. 16. The ampacities for conductors No. 14 and (b) Future Additions larger shall be the values given in Table 310-17 for 60 C (1) Existing unnumbered paragraph. conductors. (2) When a motor feeder ampacity is oversized by a Exception No. 2 for (1) and (2) above: Conductors of No. 14 specific growth factor in amperes this growth factor shall be and larger which extend beyond the motor control equipment added to "the sum of the full-load currents of the other motors enclosure shall be considered as protected by the motor of the group" in Section 430-62(a) when determining the feeder branch-clrcuit short-circuit andground-fault protective protective device rating. device(s) where the rating of the protective device(s) is not SUBSTANTIATION: The purpose of Part E is to allow the ratings more than 300 percent of the ampacity of the control circuit of the protective devices on motor feeder circuits to be higher ~onductors. The ampacities shall be the values given in Table than the conductor ~npacity so that locked rotor current will 310-16 for 60 C conductors. not cause nuisance operation of the protective device during Exception No. 3 for (1) and (2) above: Conductors supplied~by motor starting. When growth factors are designed into a motor the secondary side of a single-phase transformer having only a feeder it is intended that motors will be added to utilize this 2-wire (single-voltage) secondary shall be considered as capacity. This proposal will allow the feeder protective device protected by overcurrent protection provided on the primary to be selected for the intended load, eliminating future (supply) side of the transformer, provided this protection is in nuisance operations and costly protective device changes, accordance with Section 450-3 and does not exceed the value PANEL RECOMMENDATION: Reject. determined by multiplying the secondary conductor ampacity by PANEL COMMENT: Panel feels subject is adequately covered. the secondary-to-primary voltage ratio. Transformer secondary VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. conductors (other than 2-wire) are not considered to be protected by the primary overcurrent protection. i Exception No. 4 for (1) and (2) above: Conductors of control circuits shall be considered as protected by the motor 430-71(a): Accept CMP 11 branch-clrcuit short-circult and ground-fault protective SUBMITTER: TSC-Control Circuit Protection device(s) where the opening of the control circuit would create PROPOSAL: 63 Delete second paragraph of Section 430-71(a). a hazard, as for example, the control circuit of a fire pump ~]~'~'AI~I'IATION: Provision covered in TSC Proposal No. 4 for motor, and the like. ~evislon of Section 430-72. See 430-72(a). (c) Control Circuit Transformer. Where a motor control PANEL RECOMMENDATION: Accept. circuit transformer is provided, the transformer shall be VOTE ON PANEL RECOMMENDATION: protected in accordance with Articl~ 450. AFFIRMATIVE: 16. Exception No. 1: Where the control circuit transformer is an NEGATIVE: Gubany. integral part of the motor controller and is located within the EXPLANATION OF VOTE: motor controller enclosure, and where an ov~rcurrent device(s) GUBANY: I am voting negative on Panel acceptance since it can rated or set at not more than 200 percent of the rated secondary be proven that No. 16 and No. 18 wire cannot be protected by a current of the transformer Isprovided in the secondary circuit. 201 Exception No. 2: Where the transformer supplies a Class 1 case of small conductors forming an integral part of electronic power-limited, Class 2 or Class 3 remote control circuit controls. conforming,with the requirements of Article 725. PANEL RECOMMENDATION: Reject. Exception No. 3: Where protection~is provided by other PANEL COMMENT: See action on Proposals Nos. 63 and 65. approved means. \ VOIE ON PANEL RECOMMENDATION: Unanimously Affirmative. Exception No. 4: Overcurrent protection shall be omitted where the opening of the control circuit would create a hazard, as for example, the control circuit of a fire pump motor, and the like. 430-72(a) Exception No. 5-(New): Reject CMP 11 SUBSTANTIATION: For coordination of control circuit SUBMITTER: A. C. Clark, Manufacturing Chemists Assn. requirements. The intent is to apply Section 430-72 to all l~TO$RZTSSTL-~.68 Add a new exception as follows: portions of a control circuit tapped from a motor branch ~ion No. 5: Where the motor control circuit conductors circuit, and to apply Article 725 in all other cases, as are smaller than No. 14, overcurrent protection shall be in specified in Section 430-72(a). Other than editorial changes, accordance with Article 725. the following relates proposed revised Section 430-72 to the SUBSTANTIATION: Correlates with proposed additions of Sections 1978 NEC and other TSC proposals. 430-.IZ(b} and 725-2(e). 430-72(a) To coordinate with Article 725, as stated above. Contrary to published reports, not all remote control circuits See" also TSC Proposal No. 5 for new Section 725-2(e). must comply with Article 725. Motor-control circuits are an 430-72(b) (1) - Coordinates provisions from second paragraph, exception to Article 725 unless they cannot be described without of Section 430-72(a) of 1978 NEC with Section 725-12(a). empSoying any of the considerations given t6 remote control 430-72(b) (2) - Permits No~. 18 and 16 control circuit circuits in Article 725. conductors and coordinates with Section 725-12(b). The attached problem and analysis* indicates the typical 430-72(b), Exception No. 1 - Equivalent to Section 430-72(a), confusion that users face in deciding on the applicability of Exception No. 1 in 1978 NEC. The values of 25 amperes for No. Article 430F vs. Article 725. Since #14 copper and larger motor 18 and 40 amperes for No. 16 cntrol circuits do not meet the parameters of Article 725 and conductors are based on 400 percent of ampacities of 7 and 10 are covered elsewhere in the Code, as indicated in the problem amperes respectively, as specified in Table 400-5, and reflect analysis, confusion will be reduced by stating in Article 430F recognized practice. Reference to Table 310-17 reflects where Article 725 is applicable. recognized practice. *Attachment has been supplied to CMP members. 430-72(b), Exception No. 2 - Equivalent to Section 430-72{a), PANEL RECOMMENDATION: Reject. Exception No. 2 in 1978 NEC. PANEL COMMENt: See action on Proposals Nos. 63 and 65. , 430-72(b), Exception No. 3 - Equivalent to Section 43eO-72(b), VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Exception No. I in 1978 NEC. Same as Section 240-3, Exception No. 5 with word "only" preceding "a 2-wire (single-voltage) secondary.... " for clarification of intent. See also TSC Proposal No. 7 for new Section 725(a) and (b), Exception No. 3. 430-72(b): Reject CMP 11 430-72(b), Exception No. 4 - Equivalent to Section 430-72(a), SUBMITTER: Paul Hoh, Bussmann Mfg. Exception No. 4 of 1978 NEC. PROPOSAL: 69 Revise as follows: 430-72(c) - To coordinate with Article 725. See TSC Proposal. -~hen a motor control circuit transformer is provided it No. 9 for new Section 725-12(c). shall be protected according to Section 450-3. 430-72(c), Exception No. I - Similar to Section 430-72(b) in SUBSTANTIATION: Control transformers are a potential fire • 1978 NEC but restricted to (1) control circuits tapped from hazard whether they are a motor control transformer or a control motor branch-circuit and (2) transformers integral with motor transformer for other type(s) of equipment. Control controller where transformer primary is within controller, not transformers should be protected in compliance with 450-3. The field-wired. same level of protection should be afforded control transformers 430-72(c), Exception No. 2- Equivalent to Section 430-72(b), for motor control. Exception No. 2 in 1978 NEC. Coordinates with Article 725. PANEL RECOMMENDATION: Reject. 430-72(c), Exception No. 3 - Same as Section 430-72(b), PANEL COMMENT: Supporting comment is not persuasive as to Exception No. 3 in 1978 NEC. necesslty. 430-72(c), Exception No. 4 - Equivalent to Section 430-72(b), VOTE ON PANEL RECOMMENDATION: Exception No. 4 in 1978 NEC. AFFIRMATIVE: 15. PANEL RECOfC4ENDATION: Accept as Revised: NEGATIVE: Gubany, Kish. In Section 430-/Z[b)(1) of the Proposal, second sentence, EXPLANATION OF VOTE:

after "ampacities" delete the words "for control circuit - GUBANY: I am voting negative on Panel's rejection since I :conductors No. 14 and larger." support the author's reasoning that control transformers should l VOTE ON PANEL RECOMMENDATION: be protected asper Article 450. The transformer does not know AFFIRMATIVE: 16. where it is located. It should be protected on the primary as NEGATIVE: Gubany. required in Article 450. EXPLANATION OF VOTE: Control transformers are a big source of equipment fire. GUBANY: I am voting against the Panel's acceptance for the Sooner or leter the transformer will break down and should not same reasons as for Proposal No. 63. result in a fire. It can be easily demonstrated that a shorted primary or secondary willcause ignition. KISH: A transformer should be protected according to Section 430-72(a): Reject CMP 11 450-3 and we should not make an exception without Justification. SUBMITTER: Joseph L. Yosafat, General Electric Co. ~66 In the second paragraph, before the last three ~hall not apply" add the words "regarding ampacities." SUBSTANTIATION: The purpose of this proposal is to clarify the 430-86(a): Reject CMP 11 requirement that only the ampacities stated in Article 310 are SUBMITTER: Robert G. MacManus, Pawtucket, RI • applicable to the conductors of control circuits within an PROPOSAL: 70 Delete Section 430-86(a). enclosure. It is possible to interpret the present wording to ~'I]I~S"IS~IATION: Section 430-86(a) allows the motor and driven mean that all requirements of Article 310, such as minimum size machinery to be out of sight from the controller location if the of conductors, are applicable. controller disconnecting means is capable of being locked in the PANEL RECOMMENDATION: Reject. open position. A similar condition existed with Section 430-102 PANEC COMMENT: See action on Proposals Nos. 63 and 65. previous to the 1965 NEC, but the words "or be arranged to be VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I locked in the open position" was omitted from the 1965 NEC apparently because of a hazard to a man working on the controller. Since the same hazard exists when the motor and driven machinery are out of sight from the controller location, 430-72(a), Exception No. 1 and (b), there seems to be an apparent contradiction between Section Exception No. 5: Reject CMP 11 430-86 and Section 430-102. SUBMITTER: Joseph L. Yosafat, General Electric Co. PANEL RECOI~ENDATION: Reject. PROPOSAL: 67 At the end of (a) Exception No. 1 add, "except PANEL .COMMENT: The Panel does not agree with the supporting rating or setting of the overcurrent protective comment. device(s) shall not be required to be smaller than 15 amperes." VOTE ON PANEL RECOMMENDATION: Add a new Exception No. 5 to (b) as follows: AFFIRMATIVE: 16. Exception No. 5: The rating or setting of the overcurrent NEGATIVE: Wood. protective device(s) shall not be required to be smaller than 15 EXPLANATION OF VOTE: amperes. WOOD: I am votlng negative on this proposal since I agree SUBSTANTIATION: Tables 310-16 through 310-19 do not show with the Panel's original recommendation to accept as revised. ampacltles less than 15 amperes. Conductors having ampacities ."Delete Sections 430-86(a) and (b). Section 430-86 to read: less than 15 amperes, but not less than one-quarter of this Motor not in Sight from Controller. Where a motor and the value, are protected to the same degree as is permitted by driven machinery are not in sight from the controller location a Exception No. 1 under 430-72(a). manually operable switch that will disconnect the motor from its The present requirement is particularly impractical in the source of supply shall be placed within sight from the motor location. FPN to remain in Code."

202 ' 430-87, Exception: Accept CMP 11 the exception is required. SUBMITTER: TSC-Nomlnal Voltage Further Supporting Comment, Not for inclusion in "Preprint": ~ROI~}~'AL~T. 71 Change "For motors of 600 volts or less .... " to The loophole created by this lack of positive definition of l~r motors rated 600 volts or less .... " "portable" has been taken advantage of by a major electrical SUBSTANTIATION: To conform to the guidelines established by the manufacturer with extensive Code representation, to the extent TSC on Nomlnal Voltages. that hazards to its e~oloyees are greatly increased. (One lost PANEL RECOMMENDATION: Accept. an arm, largely because of non-lockability of cord and plug.) VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. This company looks on "portable" with the example illustrated by Webster, and its legal representatives defend this position on that basis. It cites legal references to "portable cranes" as an example of use of this word. On this basis, even an electric 430-101 FPN-(New): Reject CMP 11 locomotive could be considered as "portable." SUBMITTER: Idaho Chapter IAEI PANEL RECOMMENDATION: Accept as Revised. I~lTOPO-S']~L-~.'72 Add a third fine print note following Section For a cord- and p]ug-connected motor an attachment plug and receptacle having ratings no less than the motor ratings shall See Section 110-23 for disconnecting means for controllers be permitted to serve as the disconnecting means. A horsepower used to control loads other than motor loads. rated attachment plug and receptacle shall not be required for a SUBSTANTIATION: To cross reference that a disconnect is motor rated 2 horsepower or less. requlred In slght from all controllers that serve to govern VOTE ON PANEL RECOMMENDATION: electrical power. (See proposal for new Section 110-23 AFFIRMATIVE: 16. Disconnecting Means for Controller.) NEGATIVE: Schram. PANEL RECOMMENDATION: Reject. EXPLANATION OF VOTE: PANEL COMMENT: Outside the scope of Panel 11. SCHRAM: A negative vote is cast to draw attention to the fact VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. that receptacles and attachment plugs rated over 60 amperes may be marked "For Disconnect Use Only" and not be rated or intended for current interrupting. Also, attachment plugs and receptacles rated 60 amperes or less are tested at 150 percent 430-102, Exception No. i: Reject CMP 11 of rating. Since we believe the intent of Exception No. 5 was SUBMITTER: Joseph L. Yosafat, General Electric Co. to permit the plug and receptacle to be the disconnect means for ~73 Revise as follows: cord- and plug-connected appliance only, in accordance with ~ion No. i: The controller disconnecting means shall be Article 422, we recommend consideration of the following for the permitted to be out of sight of the controller, provided that second sentence of the Panel Recommendation. the controller is marked with a warning label giving the "A horsepower rated attachment plug and receptacle shall not location and identification of the disconnecting means. The be required for a cord- and plug-connected appliance in controller disconnecting means shall be capable of being locked accordance with Section 422-22. in the open positio6. SUBSTANTIATION: The exception permitting the disconnecting means to be out of sight of the controller if it is lockable in the open position is equally safe for motor circuits under 600 430-110(c)(1): Reject CMP 11 volts as well as for other controller circuits. Elimination of SUBMITTER: J. J. Kark, National Electrical Manufacturers the "motor circuits over 600 volts" limitation will make this ~on section more compatible with Section 430-86(a). PROPOSAL: 75 Changethe reference to "Table 430-151" in third This amendment would provide safety benefits in many paragra--~-~h to read "Table 440-XX." industrial facilities by permitting grouping of various SUBSTANTIATION: See NEMA Proposal on Table 430-151. disconnecting moans in an electrical room wherein maintenance is PANEL RECOMMENDATION: Reject. penformed by qualified personnel. It also minimizes electrical PANEL COMMENT: See Proposal No. 85A. equipment in areas where unqualified personnel are permitted to VOTE ONPANEL RECOMMENDATION: Unanimously Affirmative. work. • PANEL RECOMMENDATION: Reject. PANEL C{X4MENT: The Panel does not agree with the supporting comment. 430-110(c)(I), Exception: Accept CMP 11 VOTE ON PANEL RECOMMENDATION: Secretary's Note: It was the action of the Correlatin'g AFFIRMAIIVE: lb. Committee that the Panel review the Recommendation to clarify NEGATIVE: Mierendorf. the use of "shall be permitted to be" and the units to be EXPLANATION OF VOTE: compared. MIERENDORF: The requirements of Proposal No. 73 to provide a SUBMITTER: Richard J. Denny, Air Conditioning & Refrigeration warning label and locking means when the controller T~ disconnecting means is out of sight of the controller is PROPOSAL: 76 Revise as follows: considered to be of less danger to personnel than relying on the ~ion: Where part of the concurrent load is resistance disconnecting means being "in sight of" the controller. load, and where the disconnecting means is a switch rated in In multi-motor installations, many switches look alike and horsepower and amperes, the horsepower rating of the switch "is could easily lead to confusion when trusting to an "in sight of" permitted to be" not less than the combined load of the situation. motor(s), "provided" the ampere rating "is" not less than the Another indirect undesirable consequence of rejection of this locked-rotor current of the motor(s) plus the resistance load. proposal is the possibility of controllers being located in SUBSTANTIATION: Change is for permissive wording. Section undesirable environments, with attendant risks of malfunction in 430-110(c)(1) provides for adequate rating of disconnect without order to have the associated disconnect moans located "in sight application of exception. When motor load is small with respect of" the controller. to resistance heater load, exception may permit lower adequate rating of disconnect; however, when motor load is larger with respect to resistance heater load, application of exception could result in higher rating of disconnect than necessary. 430-109, Exception No. 5: Accept CMP 11 PANEL RECOIeJ4ENDATION: Accept as Revised: SUBMITTER: Ralph H. Lee, Lee Electrical Eng., Inc. Exception: Where part of the concurrent load is resistance ~74 Revise as follows: load, and where the)disconnecting means is a switch rated in ---E'R'Ce~ion No. 5: For motors of portable appliances rated at 2 horsepower and amperes, the horsepower rating of the switch horsepower or less and 300 volts or less, an attachment plug and shall be permitted to be not less than the combined load of the receptacle having ratings no less than the motor ratings shall motor(s), if the ampere rating of the switch is not less than be permitted to serve as the disconnecting means. the locked-rotor current of the motor(s) plus the resistance SUBSTANTIATION: This proposal is intended to clarify a load. condltlon presently misinterpreted in Code application. For VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. example, a "portable motor" is interpreted, even in legal actions, as one which is movable, even by use of powered hoisting apparatus, such as fork lift trucks, and weighing a ton or more. This is patently beyond the intent of the Code, which 430-113, Exception No. 2-(New): Reject CMP 11 intended "portable" to accompany the definition of "Appliance, SUBMITTER: A.C. Clark, Manufacturing Chemists Assn. Portable: which is actually moved or can easily be moved--in PRDPOSAL: 77 Add exception as follows: normal use." Thls'indicates that the appliance may be moved ~ion No. 2: In industrial establishments only, where while in use, such as a portable electric drill, saw, vacuum conditions of maintenance and supervision assure that only cleaner, concrete finisher or the like, not.a piece of equipment qualified persons will service the installed motor and weighing a ton or more and movable only with powered hoisting motor-operated equipment, all disconnecting means shall be equipment. permitted to be remotely located provided the disconnecting This rewording and limit o~the exception is in general means for other than control and signal devices is capable of agreement with Exception 2, especially in view of the control being locked in the open position. device being separate from the disconnecting means. SUBSTANTIATION: In industrial establishments, the term Lacking a direct definition for "portable," reference must now motor-operated equipment sometimes covers such a broad scope as be made, by some parties, to Webster, which includes as an to make the provisions of Section 430-113 overly restrictive. example, "a portable schoolhouse." To prevent misuse with the For example, an extruder is a piece of motor-operated equipment attendant hazards, positive definition of the intended scope of that consists of a motor drlve and several sectlons of electrlc 203 heaters around the extruder barrel. Established industry after servicing the equipment. The switch could fail or become practice has been to use motor and heater disconnects that are inoperative due to a loose wire or contamination resulting in remotely located and capable of being locked open. Section the opening of a critical interlock circuit which may result in 430-113 now prohibits this. extensive damage to a process or create an explosion hazard. In A second example of motor-operated equipment is a motor driven hazardous areas, explosion-proof switch devices would need to be conveyor with photocell sensors along the conveyor. For these added, increasing the hazard potential in these areas. As more photocells there is no safety need to require a local disconnect terminations and switches are added, reliability decreases. for these photocells. Established industry practlce has been to Industry has been operating for decades without providing use disconnects that are remotely located. These remote immediately adjacent disconnecting means from each source of disconnects are often contained in a panelboard and are electrical energy relative to control and monitoring circuits generally of the non-lockable type. with a good safety record. There is no Justification to impose A motor itself often contains RTD's, thermistors, or switches this high cost, impractical requirement on industry and within the motor housing. Established industrial practice has commerce. In many applications, this Panel member feels been to use only remote disconnects for these sensors. strongly that a greater hazard would be created by strict Industrial establishments have followed the above established adherence to Section 430-113 in its present form. practices for years and have achieved an excellent safety record where the equipment is serviced by qualified personnel. For such reasons, Section 430-113 is overly restrictive and should be changed by the proposed Exception 2. 430-122: Reject CMP 11 PANEL RECOMMENDATION: Reject. SUBMITTER: L. A. Burton, Oconomowoc, WI PANEL COMMENT: Present requirement is necessary. !~rO~'O-S'At-~.79 Add a new sentence as follows: The controller VOTE ON PANEL RECOMMENDATION: ~so be marked with the fuse designation which will AFFIRMATIVE: 16. properly coordinate the fuse with the interrupting rating of the NEGATIVE: Dye. contractor. EXPLANATION OF VOTE: • SUBSTANTIATION: Although the control manufacturer's literature DYE: I contend that operator safety is jeopardized as the' may contain sufficient information to make a proper fuse Code now stands requiring disconnect switches adjacent to the selection, this information is not likely to be available to the motor or motor operated equipment for each source of energy. inspection authority or to an electrician when a fuse is In the first place the .number of switches required would block replaced. the operator's view of the process especially in multi-motor (up If the contacts of instantaneous relays (e.g., groundrfault to 100 or more motors per line) processes such as steel, auto, relays) are in the control circuit or if the control voltage for chemical, and paper. the contactor is obtained from the power systems through a In the second place the danger to an operator of pulling a DC control transformer, there is an opportunity for a serious field switch on a DC motor or a synchronous motor is great. It mishap to occur under fault conditions. The contactor will would also be dangerous to the operator if he pulled the begin to open at the inception of the fault. disconnect switch on safety devices such as pressure,/flow, zero If the total clearing time of the fuse exceeds the contactor speed, o~ photocell switches. minimum dropout time, the contactor will attempt to interrrupt The hostile operating floor environment (oil, dirt, corrosive the fault current while the fuse is melting or arcing. If the chemical, and hazardous atmospheres) that these switches would fault current is greater than the interrupting rating of the be located in will lead to early failure. This is a hazard to contactor, the fault will not be cleared by the contactor. operators from an electrical energy release and from Ionized gases from a contactor which is failing to interrupt may malfunctions of safety devices. result in other flashovers within the controller, possibly ahead of the fuses. The interrupting rating and opening time of contactors vary with manufacturer and cannot be controlled by Industry 430-113, Exception No. 2-(New): Accept CM~ 11 Standards. For example, a commercially available contactor has SUBMITTER: Alton R. Thompson, Durham, NC an interrupting rating of 4400 amperes at rated voltage and an l~TO]~I~SKL-T.'78 Add~anexception as follows: opening time of .020 seconds. The attached* clearing ---E'x~e-p~-ion-No. 2: A separate disconnecting means shall not be time-current curves for Motor Starter Current Limiting fuses required for a Class II or Class Ill remote-control circuit of show that this contactor cannot be used with 9R, 12R, 18R, or 50 volts or less. 24R fuses, because fault currents in the cross-hatched area will SUBSTANTIATION: This would resolve a lot of problems in the not be cleared by these fuses in the time it takes for the field where now a disconnect is required. Class 2 and Class 3 contactor to open. Under-these fault conditions, there is no circuits of 50 volts or less would not create a shock hazard, coordination and the contactor would be placed in the position fire hazard, or a mechanical hazard. This exception is needed of attempting to interrupt a current higher than its rating. to clear up confusion by specifically permitting what is PANEL RECOMMENDATION: Reject. generally being excepted. PANEL COMMENT: Proposal is primarily a design consideration. PANEL RECO~IENDATION: Accept as Revised: VDTE ON PANEL RECOMMENDATION: Change "Class II and Class Ill" to "Class 2" and after AFFIRMATIVE: 16. "circuit" change the rest of the sentence to read "conforming NEGATIVE: Gubany. lwith Article 725, rated not more than 30 volts and which is EXPLANATION OF VOTE: ~isolated and ungrounded." GUBANY: I am voting negative on Panel's rejection since I I Change existing exception to Exception No. i and add the agree with the author's substantiating comment. It is very Iproposed exception as Exception No. 2. timely that equipment be adequately marked for proper protection VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in order for the installation to comply with Section 110-10 and COMMENT ON VOTE: Section 240-2. The proper matching of overcurrent protective ANANIAN: My reason for voting affirmative on the proposal is devices with the withstand ratings of equipment and components that it provides some relief relative to alleviating the should'be made very obvious. necessity to supply immediately adjacent disconnects for some Class 2 circuits used in control and monitoring systems. However, in my voting affirmative to reject Proposal No. 77, I feel this proposal should be expanded to include the following 430-125(a): Accept " CMP 11 additional exceptions: SUBMITTER: A. P. White, Attleboro, MA Exception No. 3: External interlock control circuits and I~TO]~[-T.'80 Delete the words "running overcurrent (overload)" monitoring circuits operating at less than 150 volts need not be l an-6-d--~e~Face with the word "overload." disconnected provided that the circuit conductors are grouped, SUBSTANTIATION: See A. P. White substantiation for proposal for identified and covered and a warning "label is attached adjacent Diagram 430-I. to the equipment enclosure disconnect(s) identifying the source PANEL RECOMMENDATION: Acceptas ~evised: and location of the interlock contacts and monitoring circuits. I Revise proposal to read - In lines 2 and 3 delete the words Exception No. 4: Separately excited synchronous and direct "motor-running overcurrent (overload)" and replace with the word current motors need not have their field circuits disconnected "overload." provided that a warning label is attached adjacent to the field VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. terminal box identifying the location of the remote source disconnecting means capable of being locked in the open position. My substantiating comments for proposing to add Exceptions No. i 3 and No. 4 are:. 430-132(d), (e), and (f)-(New): Reject CMP 11 Section 430-113, as written, is so broad and far reaching as SUBMI1-FER: R. S. Pinkerton, Los Angeles, CA to be impractical. For example, the term "energy," unless IMTOI~S'A~-T.'81 Add new (d), (e), and (f) as follows: defined as to magnitude and potential, would include any device --'T-d-F--Motor control equipment which is accessible to such as thermo-couple outputs which potential is in millivolts unqualified persons shall be enclosed and shall be arranged to creating no hazard. Also included would be telemetering be operated, including the resetting of overcurrent protective circuits, proximity switch outputs, sensor outputs, dry safety devices, from the outside of the enclosing case. control interlock contacts, etc. In an integrated process or Exception No. I: The resetting means need not be externally highly automated assembly or manufacturing operation, a central operable provided the disconnecting means is part of the control system could have many sources of energy. It would be controller and is so interlocked that the controller door cannot highly impractical and essentially not feasible to provide be opened when any bare parts are energized in the controller disconnects on ali of these sources. Greater hazards would be enclosure. created in the event ~hat a safety interlock were left open Exception No. 2: Elevator control equipment located as 204 J providedkln Article 620 need not be enclosed. Table 430-149: Accept CMP 11 (e) Where mechanical equipment such as valves, guages, SUBMITTER: J. J. Kark, National Electrical Manufacturers regulators or similar equipment which requires manual adjustment iITg~-6~Ta-~'fon are installed within the same enclosure with live parts, PROPOSAL: 84 Removethe four columns and the heading for barriers shall be provided to separate llve parts from ~ous Type Unity Power Factor Amperes. Remove the + mechanical equipment. reference at the bottom of the Table.. (f) Where two or more contactors or other controllers are l SUBSTANTIATION This synchronous motor portion of the two-phase installed in the same cabinet or other enclosure, suitable Table 430-14B should either be revised to show voltages of 230, barriers shall be installed between them. 460 and 575 with currents for these voltages or the columns Exception: Where all the devices in the enclosures serve a should be eliminated. single machine and are simultaneously de-energized by a single By the time of issue of the 1981 Code, it is the opinion of disconnecting means, barriers will not be required. the Submitter that there will be practically no need for this SUBSTANTIATION: In the normal process of operating many types information. of machines, frequent overloads require resetting of the motor PANEL RECOMMENDATION: Accept. overload device or replacing fuses., Rarely is time taken to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. call an electrician for this simple operation and the machine operator resets the equipment. As people are operating this equipment who are unqualified in terms of electrical hazards, it is necessary to specify and provide control equipment which is Table 430-151: Reject CMP 11 totally enclosed and the necessary resetting can be acc6mpllshed SUBMITTER: J. J. Kark, National Electrical Manufacturers without exposing the operator to energized live parts. 7T~B~l'a-t-Ton Furthermore, controller enclosures frequently contain PROPOSAL: 85 Removethis Table from Article 430 and add the mechanical equipment which requires adjustment or contains of this Table as Table 440-XX in Article 440. several controllers for independently operating machines. SUBSTANTIATION: Someconfusion has developed because the Mechanics for the machines should not be exposed to live present NEMA fable for locked-rotor.current differs some from energized parts when they turn a v~Ive or set regulator or the values in Table 430-151. As part of Article 430, the Table manually adjust mechanical equipment. Maintenance electricians 430-151 has been considered as a specification for general should not be required to replace motor controllers or replace purpose motors, whereas, the Table is intended for use in parts where there are adjacent non-barriered and energized motor conversion between current and hp ratings of other branch controllers. circuit components. Changes in the values in Table 430-151 are PANEL RECOMMENDATION: Reject. not practical because of numerous approvals of apparatus based PANEL COMMENT: Proposal is primarily a design consideration. on these currents which are known to provide satisfactory VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. applications. Correlating changes are required in Sections 430-110 and 440-12.. PANEL RECOMHENDATION: Reject. 430-132(d), (e), and (f)-(New): Reject CMP 11 PANEL COMMENT: See Proposal No. 85A. SUBMII-I'ER: Southwestern Section IAEI VOlE ON PANEL RECOMMENDATION: Unanimously Affirmative. I~-01~17TL-~.'82 (d) Motor control equipment which is accessible ~lified persons shall be enclosed and shall be arranged to be operated, including the resetting of overcurrent protective devices, from the outside of the enclosing case. Table 430-151: Accept CMP 11 Exception No. I: The resetting means need not be externally SUBMITTER: CMP 11 operable provided the disconnecting means is part of the 85A Revise title of Table and add Fine Print Note, controller and is so interlocked that the controller door cannot be opened when any bare parts are energized in the controller enclosure. Table 430-151. Conversion Table of Locked-Rotor Currents for Exception No. 2: Elevator control equipment located as Selection of Disconnecting Means and Controllers as determined provided in Ar{icle 620 need not be enclosed. from horsepower and voltage rating. For use only with Sections (e) Where mechanical equipment such as valves, gages, 450-110, 440-12 and 440-41. regulators or similar equipment which requires manual adjustment are installed within the same enclosure with live parts, Motor Locked-Rotor Current Amperes* barriers shall be provided to separate live parts from Single Phase Two or Three Phase mechanical equipment. (f) Where two or more contactors or other controllers are Max.HP installed in the same cabinet or other enclosure, suitable 115v 230v 115v 200v 230v ' 460v 575v Rating barriers shall be installed between them. Exception: Where all the devices in the enclosures serve a 58.8 29.4 24 13.8 12 6 4.8 1/2 single machine and are simultaneously de-energized by a single 82.8 41.4 33.6 19.3 16.8 8.4 6.6 3/4 disconnecting means, barriers will not be required. 96 , 48 43.2 24.8 21.6 10.8 8.4 I SUBSTANTIATION: In the normal process of operating many types 120 60 62 35.9 31.2 15.6 12.6 1 1/2 •of machines, frequent overloads require resetting of the motor 144 72 81 46.9 40.8 20.4 16.2 2 overload device or replacing fuses. Rarely is time taken to 204 102 66 58 26.8 23.4 3 call an electrician for this simple operation and the machine 336 168 105 91 45.6 36.6 5 operator resets th9 equipment. As people are operating this 480 240 152 132 66 54 7 1/2 equipment who.are unqualified in terms of electrical hazards, it 600 300 193 168 84 66 10 is necessary to specify and provide control equipment which is 290 252 126 102 15 totally enclosed and the necessary resetting can be accomplished 373 324 162 132 20 without exposing the operator to energized live parts. 469 408 204 162 25 Furthermore, controller enclosures frequently contain 552 480 240 192 30 mechanical equipment which requires adjustment or contains 718 624 312 246 40 several controllers for independently operating machines. B97 780 390 312 . 50 Mechanics ~or the machines should not be exposed to live 1063 924 462 372 60 energized parts when they turn a valve or set a regulator or 1325 1152 576 462 75 manually adjust mechanical equipment. Maintenance electricians 1711 1488 744 594 100 should not be required to replace motor controllers or replace 2153 1872 936 750 125 parts where "there are adjacent non-barriered and energized motor 2484 2160 1080 864 150 controllers. 3312 2880 1440 1152 200 PANEL RECOMMENDATION: Reject. PANEL COMMENT: Proposal is primarily a design consideration. VOTE ON PANEL RECOMMENDATION: Unanimousl~ Affirmative. (FPN) *These values of motor locked-rotor current are-. approximately 6 times the full-load current values given in Tables 430-148 and 430-150.

430-145(a) FPN-(New): Accept CMP 11 SUBSTANTIATION: See Substantiation for Proposals 85 and 9g, and SUBMITTER: IdahoChapter IAEI to correlate with values in Tables 430-148 and 430-150. l~TOl~)-S'At-~.'83 Add a fine print note following Section PANEL RECOMMENDATION: Accept. vuIE ON PANEL RECOI~MENDATION: Unanimously Affirmative. ~ion 430-12(e)for grounding connection devices or I fittings required at motor terminal housings. SUBSTANTIATION: To cross reference the grounding termination requirements at motor terminal housings of the preceding • Table 430-152: Accept CMP 11 proposal. (See proposal 430-12(e). SUBMITTER: A. P. White, Attleboro, MA PANEL RECOMMENDATION: Accept as Revised: ~ 86 In the title, add the words, "Short-Circuit," and I Modify by changing "devices or fittings" to "means." ~-G'~o-6-6"~ault '' after the words "Branch-circuit." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ISUBSTANTIATION: See A. P. White substantiation for proposal for ulagram 4~U-I. PANEL RECOMMENDATION: Accept. VUIL UN PANtL RECUMMLNDATION: Unanimously Affirmative. 205 ARTICLE 440 -- AIR-CONDITIONING AND REFRIGERATING EQUIPMENT 440-12(a)(2) and (b)(1)b.: Reject CMP 11 SUBMITTER: J. J. Kark, National Electrical Manufacturers 440-3(b): Reject • CMP 11 ~on SUBMITTER: Richard J. Denny, Air Conditioning & Refrigeration PROPOSAL: go Changethe references to "Table 430-151" to read T~ ~Ta~Te-i[40-XX." PROPOSAL: 87 Add a sentence before the iast sentence as SUBSTANTIATION: See NEMA Proposal - on Table 430-151. PANEL RECO~ENDATION: Reject. In no case shall the ma~ked maximum rating of the PANEL COMMENT: See Proposal 85A. branch-circuit short-circuit and ground-fault protective device VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be less than the marked minimum supply circuit conductor ampacity. [ . SUBSTANTIATION: The actual marked values may be greater than ~minimum, and/or may be less than the calculated 440-12(b)(1), Exception: Accept CMP 11 maximum. Under the present rules, the,marked maximum rating of Secretary's Note: It was the action of the Correlating the branch-circuit short-circuit and ground-fault protective Committee that the Panel review the Recommendation to clarify device (fuse or circuit breaker) could be less than the marked the use of "shall be permitted to be" and the units to be minimum supply circuit conductor ampacity, especially since the compared. marked maximum fuse or circuit breaker rating is normally SUBMITTER: Richard J. Denny, Air-Conditioning & Refrigeration redbced from the calculated maximum to a standard rating as given in Section 240.6. The possibility of this occurrence is PROPOSAL: 91 Revise as follows: greatest when a substantial part of the combination load is x--~ion: Where part of the concurrent load is a resistance electric resistance space heating. There are heat pumps on the load and the disconnecting means is a-switch rated in horsepower market with this cross-over of marked limits. Although Section and amperes, the horsepower rating of the switch "is permitted 440-22(b) permits the rating of the fuse or circuit breaker to to" be not less than the combined load to the be increased to the next standard rating higher than the motor-compressor(s) and other motor(s) at the locked-rotor conductor ampacity (by reference to Section 430-53, which condition, "provided" the ampere rating is not less than this references Section 240-3 Exception No. I), the marked maximum locked-rotor load plus the resistance load. rating of the fuse or circuit breaker cannot be exceeded. The SUBSTANTIATION: Change is for permissive wording. Section change is to remove unintended permission for a crossover of the 440-12(b)(1) provides for adequate rating of disconnect without minimum and maximum marked values. application of exception. When motor load is small with respect PANEL RECOMMENDATION: Reject. to resistance heater load, exception may permit lower adequate ~ANEL COMMENT: See Panel comment on Proposal No. 10. rating of disconnect; however, when motor load ~ larger with VOTE ON PANEL RECOMMENDATION: respect to resistance heater load, application of exception AFFIRMATIVE: 16. could result in higher rating of disconnect than necessary. NEGATIVE: Schram. PANEL RECOMMENDATION: Accept as Revised: EXPLANATION OF VOTE: Exception: Where part of the concurrent load is a resistance SCHRAM: While we agree a design consideration is involved, it load and the disconnecting means is a switch rated in horsepower is the design of the marking. We do not believe the Code should and amperes~ the horsepower rating of the switch shall be permit a marking which is in conflict with the intent, as stated permitted to be not less than the combined load to the in the proposal. motor-compressor(s) and other motor(s) at the locked-rotor condition, if the ampere rating of the switch is not less than this locked-rotor load plus the resistance load. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 440-3(b): Reject CMP 11 SUBMITTER: Alton R. Thompson, Durham, NC I~rOIR~-~.~ Add a sentence before the last sentence as 440-14: Accept CMP 11 In no case shall the marked maximum rating of the Secretary's Note: It was the action of the Correlating branch-circuit, short-circuit and ground-fault protective device Cor~nittee that the Panel review the Recommendation with respect be less than the marked minimum supply circuit conductor to the fine print note. amapcity. SUBMITTER: L~uis Miraglia, Boston, MA SUBSTANTIATION: The actual marked values may be greater than ~-R-O-F~'A-L-~.'92 Deletethe word "readily." the calculated minimum, and/or may be less than the calculated ~]~r~'~I~I'IATION: In my opinion refrigerators have had outlets maximum. Under the present rules, the marked maximum rating of behind them for years. I have yet to hear of any person who has the branch-clrcuit, short-circuit and ground-fault protective been injured from such an installation: device (fuse or circuit breaker), could be less than the marked Household refrigerators should be considered as an applicance minimum supply circuit conductor ampacity, especially since the occupying dedicated space as per 210-25(b) (second paragraph). marked maximum fuse or circuit breaker rating is normally PANEL RECOMMENDATION: Accept asRevised: reduced from the calculated maximum to a standard rating as Change Section 440-14 to read: given in Section 240-6. The possibility of this occurrence is Location. A disconnecting means shall be located within sight greatest when a substantial part of the combination load is from and readily accessible from the air-conditioning or electric resistance space heating. There are heat pumps on the refrigerating equipment. Add an exception reading: market with this cross-over of marked limits. Although" Section Exception: Cord- and plug-connected appliances. 440-220(b) permits the rating of the fuse or circuit breaker to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be increased to the next standard rating higher than the COMMENT ON VOTE: conductor ampacity (by reference to Section 430-53, which SCHRAM: The only change in Section 440-14 is to add the references Section 240-3 Exception No. I), the marked maximum exception. The present fine print note should be retained. rating of the fuse or circuit breaker cannot be exceeded. The change is to remove unintended permission for a cress-over of the minimum and maximum marked values.

PANEL RECOMMENDATION: Reject. I 440-21: Accept • .CMP 11 PANEL COMMENT: See Panel comment on Proposal No. 10. SUBMITTER: A. P. White, Attl~boro, MA VOTE ON PANEL RECOMMENDATION: l~TO!~O~'Al~.'g3" Delete the word "overcurrent" in line one. AFFIRMATIVE: 16. ~'I~']7~rIATION: See A. P. White substantiation for proposal for NEGATIVE: Schram. Diagram 430-I. EXPLANATION OF VOTE: PANEL RECOMMENDATION: Accept. SCHRAM: See Comment on Proposal No. 88. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative:

440-3(c) FPN: Reject CMP 11 440-22(b) Exception No. 3-(New~(HOD 1978 NEC): Accept CMP 11 SUBMITTER: W. L. Howard, General Electric Co. Secretary's Note: It was the action of the Correlating P]TOI~T~L-~." 89 Revise the last sentence of fine print note as Committee that this Proposal be reported as a "reject," because The value of the branch-circuit selection current will less than two-thirds of the members eligible to vote have not voted never be less than the rated load current. in the affirmative. SUBSTANTIATION: Present wording would have the effect of SUBMITTER: J. A. Pietsch, General Electric Company arbitrarily adding some value of current to a rated load current ~94 Add Exception No. 3 to Section 440-22(b) as which is already greater than or equal to 64.1% of the maximum TBT~. continuous current of the compressor. Exception No. 3: Where the branch circuit, short-circuit and PANEL RECOI~ENDATION: Reject. ground-fault protection is rated 60 amps or less and 250 volts PANEL COMMENT: The present wording adequately ~eflects the or less, either fuses or inverse-time type circuit breakers may Panel's intent. be installed unless otherwise .li@ited by marking on the VOTE ON PANEL RECO~@IENDATION: Unanimously Affirmative. equipment nameplate. SUBSTANTIATION: The intent of this proposal and a related proposal to change Section 424-22(a) is to permit the use of inverse time t~q~e circuit breakers where appropriate on fixed Heating, Air Conditioning and Refrlgeration Equipment branch circuits. 206 Successful results with specific equipments approved as installation, or possibly group installations should even be individual types or models for circuit breaker branch circuit prohibited. protection have shown that such devices do not constitute a LOPEZ: I am abstaining from voting on this proposal and safety hazard. And, the circuit breakers permit improved deferring this to the judgment of other Panel members who have protection to power utilization equipment by disconnecting all the specialized know how and experience relative to the ungrounded supply conductors simultaneously. application and protection of the equipment covered by this PANEL RECOMMENDATION: Accept as Revised. proposal. Change 60 amps. to 50 amps. MYERS: Circuit breaker test data submitted at the Panel VOTE ON PANEL RECOMMENDATION: meeting was impressive but it was a test of only one AFFIRMATIVE: 7. manufacturers circuit breaker. If this proposal is approved it NEGATIVE: Ananian, Gubany, Kish, Lawry, Myers, O'Brien, would give blanket approval to all circuit breakers. I feel Osborn, Smith. this is a problem that must be resolved between the NOT VOTING: Aquilino, Lopez. manufacturers and a recognized testing agency, not the COP~MENT ON VOTE: CodeLMaking Panel. SCHRAM: We believe the data submitted supports acceptance of O'BRIEN: Our position is to reject Proposal No. 94 due to the proposal without the reduction to 50 amperes. insufficient evidence to support the suggested changes. It is WOOD: I have voted in the affirmative on this proposal since our position that the consumer is better protected withthe it is generally known that a large percentage of these present language in the Code. installations have been installed with circuit breaker OSBORN: Data submitted puts serious doubts on the protection. advisability of multi-motor branch circuit with any type of There appears to be very little evidence of this type overcurrent protection. CMP 11 now should restudy multi-motor installation causing or contributing to loss of life or fire. branch circuit protection. Through the various test data supplied to the Panel it has SMITH: The present wording of the proposal automatically become apparent to me that no overload devices, fuses or circuit qualifies inverse-time type circuit breakers for the purpose. breakers, provide adequate protection on multi-motor circuits. The NEC should not be the judge of a products ability to perform This Panel should review its position regarding protection on adequately or safely. The agency to perform the above should be all types of multi-motor circuits as it appears that damage to a recognized testing laboratory. circuit components is prevalent when any single overload device If the capability of the circuit breaker to protect is is used. demonstrated and documented then this proposal is acceptable. EXPLANATION OF VOTE: ANANIAN: In reviewing the Fact-Finding Report conducted by UL for the Air Conditioning and Refrigeration Institute and subsequent tests conducted by fuse and circuit breaker 440-22(b), Exception No. 3-(New): Reject • CMP 11 manufacturers, it appears that inadvertent use of either 60 SUBMITTER: J.J. Kark, National Electrical Manufacturers Assn. ampere fuses or circuit breakers may result in equipment Pl~-OlTO-S'XL-~.95 Add Exception No. 3 as follows: component and/or wire damageand burning. One would have to ~"xc-eption No. 3: Where the branch-circuit, short-circuit and conclude that the equipment branch-circuit/short-circuit and ground-fault protection is rated 60 amps or less and 250 volts ground fault protective devices used in these tests, whether or less, and where the available fault current is 5000 amps or fuse or circuit breaker, cannot assure the protection of No. 18 less, either fuses or inverse-time type circuit breakers may be nor No. 16 tap conductor wires nor certain components. Small installed unless otherwise limited by marking on the equipment wire sizes, overload heaters and contactors have limited thermal nameplate. ~tc~;~Yan~h~r~l~i~t~tec~X~e~,W~a~h are SUBSTANTIATION: The intent of this proposal and a related proposal to cnange 424-22(a) is to permit the use of conditioning equipment incorporating multi-motor loads or motors inverse-time type circuit breakers where appropriate on fixed mixed with other loads and utilizing reduced wire size tap heating, air conditioning and refrigeration equipment branch conductors in compliance with 430-53(d) would appear to need to circuits. be tested as an integrated and coordinated system utilizing A UL Fact-Finding Report dated Nov. 1, 1976 was conducted to "specific branch circuit protective devices. The circuit investigate the suitability of inverse-tlme circuit breakers for components and associated wiring would need to be tested at both these applications. low and high level fault currents to verify 12T withstand and Unfortunately~ close timing between issuance of the Report and thermal ratings approved for the installation by a recognized the final vote by the panel left little time for thorough study testing laboratory. for the 1978 Code. AQUILINO: Considerable test data has been presented both for A careful review indicates that circuit breakers were totally and against this proposal. In view of the conflicting data, and acceptable in 97% of the 387 tests summarized in the report. lacking the facilities to confirm the test results myself, I do The remalning tests had minor discrepancies. not feel there is sufficient justification for either an A field survey included in the report indicates that over 50% affirmative or negative vote at this ~ime. of the defined units installed since 1971 are in fact protected GUBANY: I am voting against acceptance of Proposal No. 94 for by circuit breakers with no field problems. the following reasons: PANEL RECOMMENDATION: Reject. I. This is the same type of proposal which was declared PANEL COMMENT: See action on Proposal No. 94. nonconsensus for the 1978 Code. ,VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 2. No new substantiating data was submitted at the last OMP 11 meeting to refute the ARI/UL Fact-Finding Report which recorded destroyed and damaged air-conditioning and electric furnace components. Section 110-10 requires component 440-52(b), Exception: Reject CMP 11 protection and 240-2 requires protection of equipment, not " SUBMITTER: R. L. Eichhorn, Whirlpool Corp. destruction. ~96 Revise exception by adding: 3. Using 50A, 60A and even IOOA overcurrent devices to ~on 20-, 30-, 40-, or 50-ampere single-phase branch protect No. 18 and No. 16 wire is out of concert with other circuits as provided in Section 440-56." sections of the NEC as well as the intent of the NEC which SUBSTANTIATION: This is a correlating proposal to the proposal limits the protection to 20A as in 240-4, such as in fixtures to add Section 440-56 Cord-and-Attachment Plug-Connected and approved cords for appliances which generally do not exceed Motor-Compressors and Equipment on 20-, 30-, 40-, or 50-Ampere six (6),feet. Even in 725-12, where the conductors leave the Branch Circuits. enclosure, the overcurrent protection is limited to 20A. PANEL RECOMMENDATION: Reject. K . 4. The change from 60A to 50A branch clrcult doesn't change PANEL COMMENT: Panel feels subject is adequately covered. the damage and destruction recorded in the ARI/UL Fact-Finding VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Report of 1978 and no new Fact-Finding Report was submitted on component protection. An air-conditioner or any other equipment can have any size branch circuit. 5. The owners" or users' equipment or property should not be 440-55 and (b): Reject CMP 11 permitted to be subjected to the damage and destruction reported SUBMITTER: Richard J. Denny, Air Conditioning & Refrigeration in the 1978 ARI/UL Fact-Finding Report using circuit breakers. T~ NOTE I: Section 240-2 refers to Protection of Equipment, not PROPOSAL: 97 Revise as follows: destruction. Also, note 240-1, the word "protection" is 7F4-O-z-5=~F~-. Cord-and-Attachment Plug Connected Motor-Compressors prominent. and Equipment on 15-, 20-, 30-, 40- or 50-Ampere Branch NOTE 2: This Proposal is for all practical purposes the same Circuits. Overload protection for motor-compressors and as Proposal No. 57 which the Panel voted to reject. equipment that are cord- and attachment plug-connected and used KISH: Approval for either fused or inverse-time type circuit on 15-or 20-ampere 120-volt, or 15-, 20-, 30-, 40- or 50-ampere breakers should not get a blanket approval. While tests were 208-or 240-volt, single-phase, branch circuits as permitted in run on specific fuses and circuit breakers to show their A~ticle 210 shall be permitted as indicated in (a), (b) and (c) worthiness, approval should come only from recognized testing below. laboratories for each grouping. (b) The rating of the attachment plug and receptacle shall LAWRY: It has been suggested that test data submitted to CMP not exceed 20 amperes at 125 volts or 50 amperes at 250 volts. 11 indicates that circuit breakers are as safe as fuses for SUBSTANTIATION: Equipment for circuits larger than 20 amperes group motor installations and consequently, as for fuses, should require additional testing to meet the present code requirements. be recognized for group installations without specific approval 440-22(b), Exception No. 2 provides for such equipment to be for that purpose. In my opinion, the test data indicates that considered as a single motor. both fuses and circuit breakers should be approved for group Section 210-21(b)(I) and Tables 210-21(b)(2) and 210-21(b)(3) 207 allow for individual branch circuits and matching plug Change line I first paragraph word: "Running" to "Overload." receptacles up to 50 amperes. Change lines 2 and 3 first paragraph words: "running Further, Section 210-23 states "It shall be acceptable for an overcurrent" to "overload." individual branch circuit to supply any load for which it is Change lines I and 2 second paragraph words: "overcurrent" to rated." "short-circuit and ground-fault." The overload protection need only protect the equipment per Change lines i and 3 third paragraph words: "overcurrent" to 440-52(a). The protection of the branch circuit and control "short-circuit and ground-fault." apparatus required under 440-52(b) is not needed since it is Change line 1 fourth paragraph word: "overcurrent" to ,provided by the branch circuit protection. "short-circuit and ground fault." PANEL RECOMMENDATION: Reject. SUBSTANTIATION: See A. P. White substantiation for proposal for PANEL COMMENT: Panel feels subject is adequately covered. Diagram 430-1. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised. In Chapter 9, Example 8 change the following'to read: Change the heading "Overcurrent Protection" to "O~erload and Short-Circuit and Ground-Fault Protection. 440-56-(New): Reject CMP 11 Change subheading "Running" to "Overload." SUBMITTER: R. L. Eichhorn, Whirlpool Corp. Add to paragraph 1, before "the 25-h.p. motor," "Where 98 Add a new sentence as follows: protected by a separate overload device." 2RFO-z~T~--. Cord-and Attachment Plug-Connected Motor-Compressors In the 1st sentence add after "42.5 amperes.", "(Section and Equipment on 20-, 30-, 40-, 50-Ampere Branch Circuits. 430-32(a)(i))." Overload protection for motor-compressors and equipment that are In the second sentence before "the 30-h.p. motor," add "Where cord-and attachment plug-connected, approved for the purpose, protected by a separate overload device." Also in the second and used on 20-, 30-, 40-, or 50-amphere 208- or 24D-volt, sentence add after "not over'50 amperes.", ,"(Section single-phase branch circuits as permitted in Article 210 shall 430-32(a)(i))." be permitted as indicated in (a), (b), and (c) below. At the end of paragraph I, add a new sentence to read: For a (a) The motor compressor shall be provided with overload motor marked "thermally protected" overload protection is protection as specified in Section'44O-52(a). Both the provided by the thermal protector (see Sections 430-7(a)(12) and controller and motor overload protective device shall be 430-32(a)(2)). Change second subheading "Branch Circuit" to approved for installation with the short-circuit and read "Branch Circuit, Short-Circuit and Ground-Fault." ground-fault protective.device for the branch circuit to which In subheading "Feeder Circuit" add to the end of paragraph the equipment is connected. "(Section 430-62(a)). ~ (b) The rating of the attachment plug and receptacle shall VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. not exceed 50 amperes at 250 volts. COMMENT ON VOTE: (c) The short-circuit and ground-fault protective device SCHRAM: The Panel Recommendation should be to add the changes protecting the branch circuit shall have sufficient time delay identified to thechanges proposed. to permit the motor-compressor and other motors to start and WHITE: The Panel Recommendation revision should be in accelerate their loads. addition to the original proposal and not as a replacement. SUBSTANTIATION: Cord-and attachment-plug connected equipment Otherwise, the revision contemplated in Proposal No. 100 would for circuits 20 amperes and larger may require additional be incomplete. testing to meet the existing code requirements. This additional testin~ is considered unnecessary since field experience with well over a million room air conditioners rated over 15 amperes to 40 amperes and not tested in accordance with the existing code have not ~hown any safety problems due to this lack of testing. Results of an AHAM survey of manufacturers disclosed this information. Section 440-22(b), Exception No. 2 provides for such equipment to be considered a single motor for the purpose of specifying branch-circuit short-circuit and ground-fault protection. Section 210-21(b) (I) permits a single receptacle installed on an individual branch circuit up to the rating of the branch circuit and up to 50 amperes. See correlating proposal for revision of section 440-52(b) Exception. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Panel feels subject is adequately covered. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

Table 440-XX-(New): 'Reject CMP 11 SUBMITTER: J. JL Kark, National Electrical Manufacturers ~on PROPOSAL: 99 Use the complete contents of Table 430-151 from Code with the following title: TABLE 440-XX. Conversion Table of Locked-Rotor Currents for Selection of Disconnecting Means and Controllers As determined from horsepower and voltage rating. For use only with Sections 430-110, 440-12 and 440-41. SUBSTANTIATION: The addition of the purpose of the Table to the bold face heading should eliminate any confusion about the use of the Table in application of the Code. Also, see the comment on the NEMA proposal - on Table 430-151. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Proposal No. 85A. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

CHAPTER 9 -- TABLES AND EXAMPLES

Chapter 9, Example No. 8: Accept CMP 11 Secretary's Note: It was the action of the Correlating Committee that the responsibility for the Examples has been assigned to the Chairman of the Panel and the Secretary of the Correlating Committee. SUBMITTER: A. P. White, Attleboro, MA Lb-R~-POSAL: 100 Change in title word: "Overcurrent" to overload ~t-Circuit and Ground-Fault." Change in line I first paragraph words: "running overcurrent" to "overload." Insert in l~ne 2 first paragraph words: "short-circuit and ground-fault ahead of "protection." Change heading "Overcurrent Protection" to "Overload and Short-Circuit and Ground-Fault Protection." Under heading Overeurrent Protection- 208 REPORT OF CODE-MAKING PANEL NO. 22 be adequate. Overcurrent protectioh should be as close as practicle, but 25 feet is too restrictive. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 8. ARTICLE445 -- GENERATORS NEGATIVE: Flach, Scalone. EXPLANATION OF VOTE: 445-I: Reject CMP 22 FLACH: I agree that 25 feet may be too short for large SUBMITTER: IdahoChapter IAEI machines, but there should be some statement in the Article ]5~-Olb-O-S'A~-~." 1 AmendSection 445-1 to include Article 240. which requires overcurrent protection for the conductors ~]I~rANTIATION: 240-21 tells us all conductors shall be connected to the generator. protected at point of supply. The inherent design of a SCALONE: The installation of an unprotected feeder for great enerator only protects the generator itself. Nowhere in distances within a building might cause a greater threat to ~rticle 445 does it give any specific overcurrent protection for human life such as fire, explosion or electrocution, than would the conduEtor leading from the generator. be caused by the lack of emergency power. I suggest modifying These generators can be changed in the field to a larger the proposed wording: generator without any knowledge of conductor ~npacity or "The length of exposed feeder installed from the generator overcurrent requirements thereby causing an overload on the terminals to the first overcurrent protective device shall not conductors and creating a fire hazard. In some installations exceed 25 feet." the conductors leading from the generator to the first overcurrent device is greater than 100 feet. See Proposal No. 3 for 445-5. "PANEL RECOMMENDATION: Reject. 445-6: Accept CMP 22 PANEL COMMENT: Unduly restricting design for larger units where SUBMITTER: TSC-Nominal Voltage other methods to prevent overloading of conductors have shown to I~TOIR)~L-~.4 Change"generators of more than 150 volts to be adequate. Supporting comment is not persuasive. This grou-~-u-6~--to read "generators operated at more than 150 volts to article outlines requirements for protection of generators. iground., Other sections of the NEC cover conductor overcurrent SUBSTANTIATION: To conform to the guidelines established by the protection. Modifications of systems must be reviewed TSC on Nominal Voltages. completely for compliance with all rules applicable in the NEC. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. AFFIRMATIVE: g. NEGATIVE: Flach. EXPLANATION OF VOTE: FLACM: I don't think adding Article 240 to the list of other ARTICLE 480 -- STORAGE BATTERIES Articles will create any controversy. By doing this, Code users will be alerted to the fact that the inherent design of a 480-5(b):Accept CMP 22 generator does not protect conductors connected to the generator SUBMITTER: TSC-Nominal Voltage output terminals. I~ROIoI)~3~-~.• 5 Add "nominal" after "24 volts" to read "(24 vo-'61"t-~7-5,nominal)." SUBSTANTIATION: To conform to the guidelines established by the i TSC on Nominal Voltages. 445-5: Reject CMP 22 PANEL RECOI~MENDATION: Accept SUBMITTER: GeorgeW. Flach, New Orleans, LA VOTE ON PANEL RECOMMENDATION: Unanimously AffirmatiVe. 2 Reviseby adding "and neutral" after "phase ~rs." The sentence will then read: "The ampacity of the phase conductors and neutral from the generator terminals to the first overcurrent device shall not be less than 115 percent of ARTICLE 700 -- EMERGENCY SYSTEMS the nameplate current:rating of the generator. SUBSTANTIATION: Clarification. Article 700: Reject CMP 22 PANEL RECOMMENDATION: Reject. SUBMITTER: H. K. Glenn, Pacific Coast Electrical Assn. PANEL COMMENT: CMP agrees with the intent of the Proposal see ]~-OPO~'-A-L-~.'6 CemblneArticles 700 and 750. actlon on Proposal No. 2A, Section 445-5. ~'I]I)'S'TA)~TIATION: Adopt the report of CMP TSC to combine Articles VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 700 and 750 r Complete text as shown on pages 391, 392, 393, 394 of the "Preprint of the proposed amendments for the 1978 National Electrical Code." NFPA NO. 70 PR 78. The present separation of the articles, both of which deal 445-5: Accept CMP 22 with alternate power sources and distribution systems intended SUBMITTER: CMP 22 to be functional when normal power supplies are disrupted, is I~TOITO-S')~-~." 2A Add a sentence to the end of 445-5 as follows: illogical and is a source of conflict in application and be permitted to size the neutral conductors in enforcement. accordance with Section 220-22. The TSC report was well conceived and the integrated subject SUBSTANTIATION: To clarify requirements for sizing the neutral. matter provides a much more coherent coverage of alternate Power To be consistent in sizing the neutral with other sources and Systems. The supporting comment by CMP 22 which accompanied the distribution methods. proposal thoroughly covers the subject and is still pertinent. PANEL RECOMMENDATION: Accept as revised. It shall be permitted The Correlating Co¢mnittee (see Secretary's note) apparently to slze the neutral conductors in accordance with Section agreed with the developed material, but unfortunately the 220-22. Conductors which must carry ground-fault currents shall assignment to "process new material in the appropriate articles" not be smaller than required by Section 250-23(b). was not accemplished. Such action to pull apart the work of the PANEL COII~ENT: Where the generator neutral is not grounded at TSC would be ill-advised and would destroy the logical Its terminal, the neutral cohductor must be of adequate size to arrangement. carry ground-fault current. PANEL RECOMMENDATION: Reject VOTE ON PANEL RECO~B~ENDATION: Unanimously Affirmative. PANEL COMMENT: See CMP action on Proposal No. 7. The Correlatlng ~emmittee has instructed CMP 22 to keep the articles separate. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. 445-5: Reject CMP 22 COW,lENT ON VOFE: SUBMITTER: IdahoChapter IAEI FLACH: Separating this proposal as has been done in Proposal 3 Amend445-5 by adding another sentence stating NOS. 21A through 21S should reduce this confusion between ~ductor shall not be over 25 feet in length and shall requirements for emergency, legally required stand-by, and terminate with a single circuit breaker or a single set of fuses optional stand-by systems. that will limit the load to the ampacity of the conductors." SUBSTANTIATION: 250-5(d) states that generators are a separately derived system. If they are such we should have some rules for giving the conductors from the generator proper Article 700 and 750-(New)(HOD 1978 NEC): Reject CMP 22 protection. There are times when it is hard to install an SUBMITTER: CMP 22 overcurrent device at the generator location. If we used a 25 RTOIIO~3XLr~.• 7 Reportof CMP TSC to combine Articles 700 and 750 foot tap rule from the generator to the overcurrent device it would prevent installations of great distance from the generator ARTICLE 700 - ALTERNATE POWER SYSTEMS to the overcurrent device. A. General 240-21 tells us all conductors shall be protected at point of ' 700-1. Scope. The provisions of this article apply to the supply. The inherent design of a generator only protects the installation, operation, and maintenance of systems consisting generator itself. Nowhere in Article 445 does it give any of circuits and equipment intended to distribute and control specific overcurrent protection for the conductor leading from electricity for illumination and/or power when the normal supply the generator. or system is interrupted. Unless specifically referenced, these See Proposal No. 1 for 445-I. provisions do not apply to health care facilities which are PANEL RECOMMENDATION: Reject covered by Article 517. j PANEL COMMENT: Unduly restricting design for larger units where, 700-2. An alternate power system shall be classified as one of other methods to prevent overloading of conductors have shown to the following: 332 REPORT OF CODE-MAKING PANEL NO. 13 450-3: Reject CMP 13 SUBMITTER: H. K. Glenn, Pacific Coast Electrical Assn. ]~TOPO-S'~I[-T 4 Add a new sentence as follows: ~ondary side of a transformer shall be permitted to be ARTICLE 450 -- TRNASFORMERS AND TRANSFORMER VAULTS protected by one or more secondary overcurrent devices where secondary taps are not over 10 feet long and the total capacity 450-1, Exception No. g-(New): Reject CMP 13 of the protective devlce(st does not exceed 125 percent of the SUBMITTER: J. D. Riley, Industrial Gas Cleaning Institute transformer rating. 1 ExceptionNo. g: Transformer used as controlled SUBSTANTIATION: There are problems in this area in the power supplles for electrostatic precipitators. interpretation of this section as to when secondary overcurrent SUBSTANTIATION: To exempt electrostatic preciptator power protection is required when secondary taps are involved. We supplies from any require~nts for protection from explosion, believe this proposal will correct the problem, and Is fire and/or tank rupture such as9 Vaults, pressure relief consistent with Sections 240-3 and 240-21. vents, space separation, barriers, water spray systems, PANEL RECOMMENDATION: Reject. enclosures, dikes, basin or trapped drains. PANEL COMMENT: Already~overed by Section 240-21. Such requirements are being enforced by so~ interpreters of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. NEC Articles 450-23, 450-24, 450-25 and 450-26. Industrial Electrostatic Precipitator Power Supplies are not used as transformers in the normal sense, but rather as sources of hlgh voltage (35,000-75,000 volts) and low current (less than 450-3(a): Accept CMP 13 3 amps) power for operation of electrostatic precipitators. In SUBMITTER: TSC-Nomlnal Voltage • such use they are connected to a sophisticated, automatic 5 Add "neminal" after "600 volts" in (at, (at(It, primary control system complete with overload protection, an---~2) secondary current sensing and spark sensing and limiting SUBSTANTIATION: To obtain uniformity of voltage levels and circuitry which effectively prevents the occurrence of ratings throughout the Code. conditions which would cause explosions within thetank. PANEL RECO~IENDATION: Accept. Operating experience since the early 1goD's in thousands of VOTE ON PANEL RECOMMENDATION: Unanimogsly Affirmative. applications has yielded no known occurrences of explosions of l electrostatic precipitator power supplies. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Total exem1~tion from all requirements of Article 450-3(a) and Table 450-3(a)(2): Accept' CMP 13 450 is not justified in view of the possible significant amount SUBMITFER: F. L. Cameron, NEMA SG-2 High Voltage Fuse Technical of combustibles involved. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~PROPOSAL: 6 450-3(a)(1) - Change 150 percent to 250 percent. ~n No. I to above - Change 150 percent to 250 percent. Table 450-3(a)(2): Under the column: Primary, Over 600 Volts, Fuse Rating - Change 200 percent to 300 percent. Under 450-2 (New): Accept CMP 13 the column: Secondary, Over 600 Volts, Fuse Rating - Change 150 Secretary's Note: It was the action of the Correlating )ercent to 250 percent and change 125 percent to 225 percent. Committee that further consideration be given to the comments SUBSTANTIATION: Prior to 1975, the allowable fuse sizing was expressed in the voting and that the Panel put the references to permitted to be as large as 250 percent of the rated primary the various standards into fine print notes rather than a current of the transformer. Because of some reputed troubles mandatory requirement. with transformers rated 600 volts or less, the value was reduced SUBMITTER: CMP 13 to 125 percent. There had been no reported cases of PROPOSAL: 33 (CMP I) Add a new paragraph after Exception No. 2 difficulties with high voltage equipments utilizing the 250 as-~-T611-ows: percent value. The institution of low ratio values for high As used in the Article the term fire resistant means a voltage transformers does, itself, lead to problems when the construction having a minimum fire rating of one hour, unless primary protection consists of high voltage fuses. \ specified otherwise according to ASTM Standard E 119-75; Fire Example: 1. The inherent overload capacity of the Tests of Building Construction and materials, NFPA 251-1972; transformer cannot be utilized when the ratio of fuse rating to also Methods of Fire Tests of Building Construction and transformer rating is low. Transformers are large devices with Materials ANSI A2.1-1972. a significant thermal capacity. Fuses are small in mass and SUBSTANTIATION: C~ 1 referred Proposa.l No. 33 for a new cannot handle the same degree of overloading. This severely, definition for "Fire-resistant construction" to CMP 13 for and unnecessarily, limits the user. action.. Example: 2. A low ratio of fuse to transformer rating PANEL RECOMMENDATION: Accept sometimes leads to melting of the fuses on inrush when the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. transformers are energized. Some transformers today allow COF~MENT ON VOTE: inrush currents of 35-40 times the full load rating current. O'NEILL: The wording of the new paragraph needs to be High voltage fuses confronted with this type of melting will revised. The phrase "unless specified otherwise" is improperly react, at best, by nuisance tripping and may even fail to located., A suggested wording may be: "As used in the Article adequately clear the hlgh voltage circuit if the initial energy the term fire resistant means a construction having a minimum " is inadequate to fully burn-back the fuse element(s). fire rating of one hour according to ASTM.... and Materials, ANSI PANEL RECOMMENDATION: Accept. A2.1-1972, unless otherwise specified in the text. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

i •

450-2, Exception Nos. 1 and 2: Accept CMP 13 450-3(b): Accept C~ 13 SUBMITTER: TSC-Nominal V~ltage SUBMITTER: TSC-Nominal Voltage ~ 2 In Exception Nos. I and 2 add "nominal" after 7 Add "nominal" after "600 volts" in (b), (b)(1), I ~'6"O0"-~[ts. , an-~d-TB)T2). SUBSTANTIATION: To obtain uniformity of voltage levels and SUBSTANTIATION: To obtain uniformity of voltage levels and ratings throughout the Code., ratings throughout the Code, PANEL RECOMMENDATION: Accept. PANEL RECOMMENDATION: Accept. yOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANELRECOMMENDATION: Unanimously Affirmative.

450-3: Reject CMP 13 450-3(b)(I), Exception No. 1: Reject CMP 13 SUBMITTER: H. K. Glenn, Pacific Coast Electrical Assn. SUBMITTER: Idaho Chapter IAEI 3 Add a new sentence as follows: 8 Delete first sentence and rewrite to read: Where ~ormer secondary conductors (other than 2 wire) are not rated primary of a transformer is 9 amperes or more, an considered to be protected by the primary overcurrent protection. overcurrent device rated or set at not more than 125 percent of SUBSTANTIATION: There are problems in this area in the this current rating shall be.permitted. (The rest of the interpretation of this section as to when secondary overcurrent Section to remain unchanged.) protection is required. We believe this addition will correct SUBSTANTIATION: Permitting the primary overcurrent protection the problem, also it is consistent with the Exception No. 5 of of a transformer to be increased 125 percent above its primary Section 240-3. rating does not seem to be out of line but'when considering the PANEL RECOMMENDATION: Reject. supporting comment for Proposal No. 7, Page 178 in the Preprint •PANEL COMMENT: "Already covered by Section 240-3. for the 1975 Code, it does, however, lose us in a lot of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. mathematical figures, as you will note from the following exerpt: Due to the required derating of overcurrent devices full use of transformer design capacity is not now possible. As an example, a 30kVA, 3-phase, 208-volt transformer has, a full-load secondary current of 83.33 amps; 125 percent of this value is 104.16. If a fused switch were used for secondary protection, the largest size standard fuse that could be used and not exceed the 104.16 amps is IOD amps. However, UL Standard 98, Section 211 214 and NEMA Standard KS 1-1969 Section 2.80(b) states: 450-21: Reject P CMP 13 "A fused switch shall be marked as a part of the electrical SUBMI1-TER: TSC-Nominal Voltage rating: Continuous Load Current not to exceed 80 percent of the ~ 12 In the last paragraph add "nominal" after "35,000 Rating of Fuses Employed in other than Motor Circuits." Therefore, the maximum load that could be supplied is 80 amps SUBSTANTIATION: To obtain uniformity of voltage levels and or 96 percent of the transformer design capacity. ratings throughout the Code. The proposal would allow 100 percent use of transformer design PANEL RECOMMENDATION: Reject. capacity and be consistent with similar provisions for motors PANEL COMMENT: The present wording adequately reflects the (Section 430-52) and conductors (Section 240-5, Exception No. 1). Panel's intent. The comment draws a lot of sympathy in that the 80 percent VOTE ON PANEL RECO~MENDATION: Unanimously Affirmative. continuous duty factor permitted only 96 percent use of the transformer design but failed to mention the fact that by going, to the nex't larger size its rating with continuous loading I permitted to 120 percent. Take the case of dry transformers 450-22: Accept CMP 13 which are designed with a high heat rise with all this high SUBMITTER: R. S. Pinkerton, Los Angeles, CA temperature wire insulation that is available. With all this I~TOI}-O~'AL-:-.'13 Add a paragraph as follows: design focused on a 100 percent operation factor is does not ~ormers exceeding 112 1/2 kVA shall not be located within seem logical to push this heat rise another 20 percent providing 12 inches of combustible materials, buildings, fire escapes, the overcurrent device is loaded properly to 80 p~rcent roofs, or door or window openings unless separated therefrom as (continuous load). Overcurrent protection is an item the Code specified by Section 450-21. relies on as, a safety factor when something out of the ordinary SUBSTANTIAT~QN: A transfQr:mer,which has a seriOUS internal. develops or is faulted into a circuit. It seems that we have ~ca~I UTTer the same Tire nazaro to adjacent combustible not only lost a partial but a great deal of the safety when this ~aterials when installed outdoors as it does when installed protection can be increased to 150 percent of the rating of a ~ndoors. Therefore, the spacing or separation from combustible transformer when it is for the purpose of recovering only 4 materials should be the same. percent of the transformer design. PANEL RECOMMENDATION: Accept as Revised: The last paragraph of the 1974 Preprint supporting comments I "Transformers exceeding 112 1/2 kVA shall not be located included herein is not only in error, it serves as the piece of within 12 inches of combustible materials of buildings." wool over the eyes because it actually permits from 120 to 150 PANEL COI~MENT: Panel agrees with intent of Proposal, but feels percent loading of the transformer instead of the 100 percent its scope was too broad as submitted. heralded in the comments. Actual in the field experience is VOTE ON PANEL RECO~ENDATION: that the overcurrent device is taken at face value (rating) and AFFIRMATIVE: 12. in many cases the transformers are operating at over a 100 NEGATIVE: Boyd. percent with the permitted 125 percent factor. - EXPLANATION OF VOTE: , i Just because the 125 percent mistake has been made in the past BOYD: Support proposal as submitted. Prescribed clearance to and has warped all face values out of proportion to where window and door openings reasonable. ampacity ratings are becoming a farce, are we committed to continue to do so especially when transformers of 112 1/2 KVA rating and less are not required in a fire resistant room? PANEL RECOI~MENDATION: Reject. 450-22: Reject CMP 13 PANEL COMaMENT: The present wording adequately reflects the SUBMII-fER: Southwestern Section IAEI Panel's intent. 14 Add the following to Section 450-22: VOTE ON PANEL RECOP~4ENDATION: Unanimously Affirmative. --'T-~a-ns-irormers exceeding 112 I/2 kVA shall not be located within 12 inches of combustible materials, buildings, fire escapes roofs or door or window openings unless separated therefrom as specified by Section 450-21. 450-5: Accept CMP 13 SUBSTANTIATION: A transformer which has a serious internal SUBMITTER: TSC-Nominal Voltage fault can offer the same fire hazard to adjacent combustible I PROPOSAL: 9 In the first line add "nominal" after "600 volts." materials when installed outdoors as it does when installed '~IATION: .To obtain uniformity of voltage levels and indoors. Therefore, the spacing or separation from combustible ratings throughout the Code. materials should be the same. PANEL RECO~MENDATION: Accept. PANEL RECO~MENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COI~MENT: This Proposal is identical to Proposal No, 13. See Panel's action on Proposal'No. 13. VOTE ON PANEL RECOI~MENDATION: AFFIRMATIVE: 12. 450-8: Accept CMP 13 NEGATIVE: Boyd. SUBMI1-TER: O. E. Dillon, Border County Div. IAEI EXPLANATION OF VOTE: !~ITO]~-O-S-AI--~.• 10 Revise as follows: BOYD: Samecomment as In Proposal No. 13. 450-8. Ventilation. The ventilation shall be adequate to dispose of the transformer full-load losses without creating temperature rise which is in excess of the transformer rating. SUBSTANTIATION: The use of the word "excessive" renders this 450-23: Reject CMP 13 section legally unenforceable. See the attached ppinion* of the SUBMITTER: JeromeM. Frank, Square D Co. San Diego City Attorney. 15 In the second sentence of the first paragraph • See Border County Div. IAEI substantiation for proposal for ~the words "and'rated over 35,000 volts." 110-16(a). SUBSTANTIATION: Since there are no NEMA or ANSI Standards for PANEL RECOMMENDATION: Accept as Revised: determining flammability, there are no test methods to determine Fine Print Note to remain. if the various liquids meet the requirements of thls paragraph. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Preliminary tests made by Factory Mutual indicated that these liquids failed the tests given to them. These liquidsdo burn more readily than Askarel. Article 450-23 at the present time permits transformers with these nonpropagatlng liquids being 450-21: Accept CMP 13 placed in hazardous environments that contain flammable material SUBMITTER: W. Creighton Schwan, Hayward, CA like paper dust, wood pulp, coal dust, etc. withoutrequiring PROPOSAL: 11 Designate the first two paragraphs as (a) and (b) the use of a fireproof vault. Since a nonpropagating liquid can resp-~vely, and designate the two exceptions as Exceptions to burn for a period of time before the flame is extinguished, (b). paper dust, wood dust, coal dust, etc. could be ignited and SUBSTANTIATION: Neither of the two exceptions apply to the cause a fire even though the nonpropagating liquid went out. It first paragraph. The suggested editorial revisions will is my understanding that at the present time there are no NEMA eliminate confusion for Code users. or ANSI or any other Standard that covers the crlterla for PANEL RECOMMENDATION: Accept as Revised: defining, testing and grading dielectric fluids used in Assign titles to (a), (b), and (c). transformers where flammabl]ity is a critical factor. It is l~I Not over 112 I/2 kVA. also my understanding that industry standards for such fluids Over 112 1/2 kVA have never been formulated to insure safety and reliability. (c) Over 35,000 volts It would seem prudent that transformers containing these Exceptions Nos. l and 2 shall apply to (b) only. liquids be placed in a fireproof vault until such time that VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. flammability standards have been developed and these liquids tested and found satisfactory. PANEL RECOI~ENDATION: Reject. PANEL CDMM~NT: me supporting comment does not justify the proposed change. VOTE ON PANEL RECO~ENDATION: U11animously Affirmative.

212 450-23: Accept CMP 13 exception to the general rule. Secretary's Note: It was the action of the Correlating Something has been lost, however. At the present time there Committee that further consideration be given to the comnents are millions of gallons of PCB's in Askarel-filled transformers expressed in the voting. in this country. The Environmental Protection Agency has SUBMITTER: ~ 13 promulgated rules which encourage the elimination of this 15A Revise first paragraph to read: environmental hazard. By requiring an automatic flre -'ITi-~--~'ire Polnt Liquid-Insulated Transformers. Traosformers extinguishing system or vault for these transformers, should the insulated with a liquid identified for use in nonconfoustible user decide to replace them with a high fire point buildings of a specific height, housing noncombustible liquid-insulated tFaqsformer or to remove the PCB-containing ' occupancies, and having a flre point not less than 300°C shall Askarel In a unit and replace it with a high fire point liquid, be permitted. Such transformers installed indoors and rated the proposed requirement will make it economically unfeasible to over 35,000 volts shall be installed in a vault. make this change. This, in turn, will mean that many Delete second paragraph. Askarel-fiIled transformers, which otherwise would have been SUBSTANTIATION: Since all the Askarel substitutes developed to replaced or retrofilled, will remain in service, thereby date will burn to some degree, installations utilizing these maintaining a serious environmental hazard and, incidentally, fluids should not be permitted in combustible buildings or those subjecting the user to stringent reporting rules to the EPA and housing combustible occupancies unless provided with an forcing him to maintain a possibly catastrophic liability on his automatic fire extinguishing system or installed in a vault. system. The ability of a noncombustible building to withstand a transformer insulating fluid fire depends upon the type of construction (steel, concrete, etc.), building height, the convective and radiative heat release rates per unit area of the 450-23: Reject CMP 13 fluid and the surface area of the containment (curbing). SUBMITTEd: TSC-Neminal Voltage On that basis,leach installation should be evaluated PROPOSAL: 16" In the first paragraph add "nominal" after individually depending upon these four factors. The heat ~T~F~-O~-volts." release rates per unlt area should be determined by a recognized SUBSTANTIATION: To obtain uniformity of voltage levels and testing laboratory in accordance with a standard procedure. If ratings throughout the Code. found excessive, than protection, In the form of an automatic PANEL RECOI~ENDATION: Reject. extinguishing system or a vault, should be provided similar to PANEL C~ENT: The present wording adequately reflects the that for a combustible building or occupancy. Panel's intent. Allowing the use of any substitute fluid without some form of VOTE ON PANEL RECOI~IENDATION: Unanimously Affirmative. fire protection may, in some instances, result in a severe exposure to llfe and propertyshould an internal fault result in a transformer fire. PANEL RECOMMENDATION: Accept as Revised: 450-23: Reject CMP 13 Revise 450-23 from NEC as follows: Secretary's Note: It was the action of the Correlating i "Transformers insulated with a listed liquid having a fine Co~ittee that this Proposal be correlated with Proposal No. 15A. ;point not less than 300°C shall be permitted to be installed SUBMITTER: TSC-Approved for the Purpose l indoors without vaults if provided with a liquid confinement PROPO~ 17 See the Technical Subcommittee "Recommendations" a~ea and protected by an automatic fire extinguishing system. un--n-d-e-r-t-~e definition of "Approved for the Purpose" in Article Such transformers when installed indoors and rated over 35,000 100. volts shall be installed in a vault complying with Part C of SUBSTANTIATION: See the TSC "findings" under the definition of this Article. " "Approved for the Purpose= in Article 100. Transformers installed outdoors shall comply with Section PANEL RECOMMENDATION: Reject. 450-27." FANEL. COMMENT: See Panel action on Proposal No. 15A. VqTE ON PANEL RECOMMENDATION: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. AFFIRMATIVE: g. NEGATIVE: Boyd, Mattson, Thomas, Tudor. COMMENT ON VOTE: ROBINSON: The purpose of this and similar proposals to the 450-23: Reject CI~~ 13 1981 and earlier codes has been to promote the acceptance of a SUBMITTER: Tor Orbeck, Dow Corning Corp. safe alternate to ASKAREL as a transformer insulating fluid for PITO]~'At-~." 18 Revise as follows: use outside of vaults. While we believe the wording proposed ~[Io~0-~72-~-~-. Tranformers Installed Indoors. Transformers insulated here is too restrictive, until such authorities as F.M. and U.L. with an insulating liquid of "labeled" and "listed" fire resolve the technical problems, we have no alternative, in the characteristics, having a fire point of nQt less than 300°C, and interest of safety, but to support the Panel. "approved for the purpose" shall be permitted to be instaTled EXPLANATION OF VOTE: indoors or outdoors. The required protection of such a BOYD: Am opposed to the panel proposal because it does not transformer installation is described in the "approval include provisions for less stringent requirements for a very principles" which relates fire characteristics o~ liquids to desirable "askarel substitute" which has been or may be potential fire hazards of transformers and determines which developed. insulating liquids can be used and the protection if required. MATTSON: The 'intent of the Task Force I is lost in the Transformers rated over 35,000 volts and used indoors shall be proposal as it is worded. installed in a vault. An exception is needed to clarify the totalconcept. Tests SUBSTANTIATION: It is our understanding that to assess the fire conducted by Factory Mutual Research indicate that some of the hazard of an insulating liquid in its use enviroment in an high fire point insulated liquids are suitable for installation electrical installation, it is necessary to consider the in non-combustible buildings with non-combustible occupancies following characteristics of a material: without automatic fire extinguishing systems depending on the I. Ease of ignition - Flash point heat release rate of the liquid and the height of the building. Auto ignition temperature The following is recommended: 450-23 (as is) Hot manifold ignition Exceptions: Transformers insulated with listed liquids Transformer explosion tests suitable for use in a non-combustlble building and a 2. Fire growth - Fire point non-combustible occupancy area shall be permitted to be 'Large-scale fire tests installed, without an automatic fire extinguishing system or Transformer explosion tests vault. (Remaining text of Proposal 15A - as is). 3. Elame spread Large-scalefire tests THOMAS: To approve this CMP recommendation, which wouJd 4. Heat release Heat of co~oustion require ~hat al! liquid-filled transformers containing a liquid Rate of burning with a fire-point not less than 300°C be diked and sprinklered, , Effects on materials and people would be to ignore work that has been done and is still underway 5. Extinguishment - Field tests at Factory Mutual Research. FMR is now evaluating substitute 6. Smoke NBS smoke chamber test liquids on the bas~s of" their use in non-combustible buildings obscuration of vision With non-combustible occupancies. animal tests { eye irritation To approve this latest revision by" the CMP would be to violate toxicity the spirit of what has been done and would create an 7. Fire gases - Qualitative and quantitative inconsistency between theNEC and what the insurers find (Smoldering and analysis acceptable. burning conditions) Animal exposure tests The original proposal, which recognizes the importance of the 8. Oxygen depletion - Large-scale tests building structure and its contents, is much more acceptable to Limiting oxygen index NEFtA. It at least sets the stage for later to supply details in (Effects on people) the NEC such as building construction, roof height, building The material evaluation must finally be related to use contents, type of liquids, fire-point of liquids, etc. environment through: TUDOR: The recommended rewording of the proposal by the panel I. Consideration of appiication and quantities involved is too restrictive. The recommendation of the Subcommittee 2. Consideration of building and location of equipment / investigating this proposal was that if a transformer was We also know that the Factory Mutual Research organization has installed in accordance with the requirements of the listing of" a project to develop principles by selecting the most important the liquid in the transformer, the unit could be installed of these test methods to be used for a listing or labeling without an automatic fire extinguishing system or vault. No system for insulating liquids. increase in safety has been gained by the elimination of this At present Section 450-23 reads as follows: 213 450-23. High Fire Point Liquid-insulated" Transformers. 450-26: Accept . CMP 13 Transformers insulated with a nonpropagating liquid approved for Secretary's Note: It was the action of the Correlating the purpose, having a fire point not less than 3DO°C, shall be Committee that it questions the need for all of the diagrams and permitted to be installed indoors or outdoors. Such requests the Panel to review them to see if they can be removed. transformers installed indoors and rated over 35,0(0) volts shall SUBMITTER: O. E. Dillon, Border County Oiv. IAEI be installed in a vault. ~22 Revise as follows: For the purposes of this article, a nonpropagating liquid ~I~'~T~L~-6"~-.Oil,lnsulated Transformer Installed Outdoors. shall be one which, when subjected to a source of ignition, may Oil-Insulated transformers shall not be installed. burn but the flame will not spread from the source of ignition. I. Within 3 feet horizontal distance of any building wall. In this description the terms "high fire point liquid" and ) 2.. Within 10 feet horizontal distance of any required exit. "nonpropagating" do not adequately describe the above fire 3. Within 20 feet vertical distance of any building overhang. characteristics of a liquid nor the associated fire hazard in 4. Within 10 feet radial distance of any window. their electrical use environment. The authority having Jurisdiction may consider fire-resistive • he proper description of the fire properties of a fiquid must barrier, alternate sprinkler systems, etc., as equivalent be strongly connected with the term "approved for the purpose." )rotection for the conditions so indicated. This term is defined in Article 100 as follows: SUBSTANTIATION: The vagueness of this language £enders this Approved for the Purpose: Approved for a specific purpose, section legally unenforceable~ See the attached opinion* of the environment, or application described in a particular Code San Diego City Attorney. requirement. *See Border County Div. IAEI substantiation for proposal for Suitability of equipment or materials for a specific purpose, 110-16(a). i environment or application may be determined by a nationally PANEL RECOMMENDATION: Accept as Revised: recognized testing laboratory, inspection agency or other 450-26. Oil-lnsulated Transformers Installed Outdoors. organization concerned with product evaluation as part of its Combustible material, combustible buildings and parts of listing and labeling program. (See "Labeled" or "Llsted'.) buildings, fire escapes, and door and window openings shall be Labeled: Equipment or materials having a label, symbol, or safeguarded from fires originating in oil-insulated transformers other identifying mark of a nationally recognized testing installed on roofs, attached to, or adjacent to a building or laboratory, ihspection agency, or other organization concerned combustible material in conformance with the following: with product evaluation that maintains periodic inspection of (a) Space.Separatlonfor Non-Combustible Construction. production of labeled equipment or materials and by whose Oil-insulated transformers shall be permitted to be located labeling is indicated compliance with nationally recognized directly adjacent to non-combustible walls provided the standards or tests to determine suitable usage 4n a specified following clearances are maintained from doors, windows and manner. other building openings: Listed: Equipment or materials included in a list published (1) Oil-lnsulated transformers shall not be'located within by a nationally recognized testing laboratory, inspection a zone extending 20 feet outward and 10 feet to either side of a agency, or other organization concerned with product evaluation building door. See Figure 1. that maintains periodic inspection of production of listed equipment or materials, and whose listing states either that the equipment or materials meets nationally recognized standards or NONCOMBUSTIBLEWALL FDOOR OPENING has been tested and found suitable for use in a specified manner. The means for identifying listed equipment may vary for each F I testing laboratory, inspection agency, or other organization ,1,1,,111111,. Villi/Ill I II/ll//xl concerned with product evaluation, some of wMch do not ' ~ ,o,~ i ooo, i._,o,I # / recognize equipment as listed unless it is also labeled. The IAI "i--"-w,o,.-'- -/ / ' authority having Jurisdiction should utilize the system employed by the listing organization to identify a listed product. Fi~ll'e I Approval Principle: The term approval principle implies a third party determination of selected fire characteristics, of approved liquids and of required protection. We believe at the j ...~lIL~. present UL and FM have the capability to perform this function. PANEL RECOMMENDATION: Reject. PANEL ~OMHENT: See Panel action on Proposal No. 15A. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (2) Ol1-1nsulated transformers shall not be located within a zone extending 10 feet outward and 10 feet to either side of 450-24: Reject C~ 13 an air intake opening. If the air intake opening is above the SUBMITTER: Charles B. Kish, The Travelers Insurance Co. transformer, there shall be a 25 feet vertical distance from the ]IITOIIO~CL-~. 19 Add a new second paragraph as follows: Areas opening to the transformer. See Figure 2, con--EnI'a'rnTng Askarel transformers should never have drain or other pipe holes to the outside that would a11ow liquid to escape. Proper diking or other means of containing total liquid spillage should be constructed. Handling and disposal of spilled liquid 7 NwOAI~70MBUSTIBLE X AIR INTAKEOPENING should be to legal guidelines. SUBSTANTIATION: "Askarel" is a PCB (polychlorinated biphenyl) which is sometimes mixed with chlorobenzene to glve particular ~llllilllllA ' "lllliillllllillll~ viscosity characteristics. PCB has been on the E.P.A. (Environmental Protection Agency) Toxic Pollutant List for several years. It is an incredible stable chemical composition that could gradually accumulate in certain ecological systems. Any spillage would be a hazard to health and expenslve to clean up. PANEL RECOMMENDATION: Reject. pANEL COMMENT: This Proposal could result in conflict with later EPA Guldelines. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. t

(3) Oil-lnsulated transformers shall not be located within 450-24: Reject ? CMP 13 a zone extending I0 feet outward and 3 feet to either side of a SUBMITTER: TSC-Nominal Voltage building window or opening other than an air intake. See Figure 20 In the penultimate line add "nominal" after 3.

SUBSTANTIATION: To obtain uniformity of voltage levels and ratings throughout the Code. PANEL RECOMMENDATION: Reject. PANEL COMMENT: The present wording adequately,~eflects the 'NONCOMBUSTIBLE Panel's intent. ~ WALL " X WINDOWOPENING VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~l'illllllllllllJ VIIIIlIIIIJ 450-25, Exception No. 2: Accept CMP 13 • SUBMITTER: TSC-Nomlnal Voltage ] p; WIDTH o ' 21 Revisethe first line as follows: x~lon No. 2: Where the nominal voltage does not exceed • ~. Figure 3 600, etc. SUBSTANTIATION: To obtain unlformlty of voltage levels and ratings throughout the Code. [] PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOIe~ENDATION: Unanimously Affirmative. 214 (4) Where the space separations above cannot be attained, (e) Oil Enclosures. Where oil frem a ruptured transformer fire resistant barriers or automatic water spray systems shall :tank can drain into the protected zones listed above, oil be permitted to be installed as safeguards. Where a barrier is enclosures that confine the oil shall be installed. Oil used, it shall extend to a projection line from the corner of enclosures shall be permitted to consist of fire resistant the transformer to the furthest corner of the window, door or dikes, curbed areas or basins, or trenches filled with coarse i opening. The height of the barrier shall be I foot above the stone. Oil enclosures shall be provided with trapped drains top of the transformer. See Figures 4 and 5. where the exposure and quantity of oil is such that removal of the oil is important. F WINDOW OR OPENING (f) On Poles, Structures or Underground. Transformers installed on poles, structures or underground shall conform to Jv////////////J the National Electrical Safety Code, ANSI C2-1977. VOTE ON PANEL RECOICMENDATION: AFFIRMATIVE: 10. NEGATIVE: Jefferson, Mattson, Thomas. EXPLANATION OF VOTE: JEFFERSON: The fire potential of oil-filled transformers is OST,8 WALL \\ well known and well-documented. However, I do not feel that this proposal offers any improvement in safety over the present code. The only factors considered are the type of building • % construction. The proposal makes no distinction as to building f WINDOWOR OPENING occupancy, residential, commercial or industrial; Building use; does not consider proximity to structures other than Jv///////////A %uildings"; and does not consider the volume of oil present. I I ~ I also object to the format and feel it is a bad precedent for the NEC. I also anticipate a flood of future proposals, additions ~1 and exceptions, attempting to address every conceivable building feature. This proposal is in conflict with Article 90-1 (c) which states, "This code is not intended as a design ~[-~1I Figure 5 specification nor an instruction manual for untrained persons." MATTSON: Negative vote would change to an affirmative if I recognition were to be made of size of the units. At presen~ 450-26 allows any transformer to be installed in accordance with (b) Space Separation for Combustible Construction. , text. By changing the title the size could be limited. {1) Oil-insulated transformers rated 100 kVA or less shall It is recognized that the intent of the proposal is for small ~e located according to the provisions set forth for units. This philosophy may be lost or misinterpreted in the noncombustible construction. future. (2) Oil-insulated transformers of more than 100 kVA rating Suggest title be changed to: 450-26 Oil-lnsulated Transformer shall be located according to the provisions set forth for Under 10,000 kVA Installed Outdoors. noncombustible construction but not closer than 10 feet from the lllOMAS: Although proposed revision provides additional building wall. detail, thereis no technical substantiation for the selected (3) Where a roof of co(nbustible material or an overhang of dimensions. combustible material is 20 feet or more above the top of an oil-insulated transformer, the required horizontal distances shall be measured from the building wall. See Figure 6 - Dimension "A." . 450-26, FPN-(New): Reject CMP 13 Where a roof of combustible material or an overhang of SUBMITTER: Samuel S. Levinrad, VA, Wash., DC combustible material is less than 20 feet above the top of an ~23 Add a fine print note as follows: oil-insulated transformer, the required horizontal distances Transformer high pressure relief valves and high voltage shall be measured from the farthest projection of the overhang. current limiting fuses are recognized safeguards for preventing SeeiFigure 6 - Dimension "B." catastrophic transformer failure. SUBSTANTIATION: It is recommended that Section 450-26, Oil-lnsulated Transformers Installed Enclosures, be revised to be consistent with the latest technology and established engineering practice. Oil-insulated transformers (padmount ~ ____ Figure 6 transformers) are presently being installed adjacent to school buildings, townhouses a~d single family residences. They are installed in shopping center parking lots and in other areas readily accessible to the general public. • ._~LEARANCE S6ction 450-26 reflects the reco~endatfons contained in "Recommended Good Practice for Transformer and Switchgear Installations", published by Factory Mutual Insurance i Association. At the time that this document was written, it was •I A" the only guide for designers with respect to fire safety. However, we feel it should have been updated. Since the ///// ///. / /////////// National Electrical Code and NFPA have no jurisdiction in the updating of the aforementioned document, it is our feeling that the National ElectriCal Code should become current with present day practices. Today's emphasis for increased safety margins on (4) Where these space separations cannot be attained, electric utility distribution systems has led to a rapid growth fire-resistant barriers or automatic water spray systems shall in the use of current-limiting fuses for the protection of be permitted to be installed as the required safeguards. Where distribution systems. a barrier is used, it shall extend 3 feet beyond each side of Available distribution system fault current has increased the transformer. The height of the barrier shall be 1 foot significantly because system voltages have increased, and higher above the top of the transformer. See Figure 7. MVA capacity station transformers are being installed. This has resulted in potential fault duties that exceed the capability of low-cost fuses historically used to protect distribution f COMBUSTIBLEWALL (SOLID OR WITH WINDOW OR OPENING) transformers. A major limitation of the expulsion fuse is its inability to limit current; as a result, tremendous amounts of energy can be fed into a fault. If the fault occurs in a ~v///////// ll////// / /////~ transformer, there is the possibility of a disruptive failure endangering life and property. Current-limlting fuses offer a unique advantage in their ability to limit the let-through current and energy within safe limits with silent, non-venting operation. Thus, increased emphasis on safety (accelerated by Figure 7 the development of pad~ounted equipment which can be applied in close proximity to the general public) has caused utility. engineers to specify current-limiting fuses to prevent these potentially violent tank failures. When a current-limiting fuse is applied to a circuit, not only can the current be substantially limited, but the arcing time is also decreased. It follows then that the energy imparted to a fault can be l substantially reduced, since it is proportional to the (c) On Roofs. Oil-insulated transformers installed on roofs let-through current squared and the total clearing time. This shall meet the requirements of this section and the floor reduction of energy makes it possible to protect distribution requirements of Section 450-42. equipment from disruptive failures and hence to improve system (d) Fire Escapes. Oil-insulated transformers shall be safety margins. Consequently,'the ability of the transformer to located such that a minimum clearance of 20 feet is maintained ,withstand faults without catastrophic failure can be immensely from fire escapes at all times. improved through the.proper application of current-limiting

215 ) fuses. section legally unenforceable. See the attached opinion* of the PANEL RECOMMENDATION: Reject. San Diego City Attorney. PANEL COMMENT: Transformer high pressure relief valves are a *See Border County Div. IAEI substantiation for proposal for requirement of ANSI C57.12.22-1969. The use of high voltage 110-16(a). current limiting fuses is a system design consideration. PANEL RECOMMENDATION: Reject. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: Panel feels subject is adequately covered. VOTE ONPANEL RECOMMENDATION: 'Unanimously Affirmative.

450-27-(New): Reject CMP 13 SUBMITTER: O. E. Dillon, Border County Div. IAEI 450-29-(New): Reject CMP 13 PROPOSAL: 24 Add new section as follows: SUBMITTER: O. E. Dillon, Border County Div. IAEI TS"O'z'27q-. Installation of Transformers in Outdoor Enclosure: 27 Add new section as follows: General. Where transformers are installed in an outdoor ~[5~0U~2"9-[-. Installation of Transformers on a Roof. Transformers enclosure, the enclosure shall consist of a substantial fence may be installed on the roof of a building, where the structure not less than 8 feet high. The fence shall be so constructed of the building is of sufficient strength to carry the that persons cannot readily climb it. Where any exposed additional weight of the transformers and their enclosures and current-carrying part is more than 8 feet above the ground, the the equipment used in connection therewith under the following height of the fence shall be not less than 10 feet, unless the conditions: Fence is located more than 5 feet horizontally from the nearest (a) Dry-type and askarel-insulated transformers shall be in such current-carrying part. The fence if of metal shall be approved weatherproof enclosures. grounded in accordance with Article 250. The gate shall be kept (b) Where oil-insulated transformers are installed and the locked, and a permanent sign legible at 12 feet shall be posted roof is of two-hour flre-resistlve construction, the enclosure on the gate, gorbidding unauthorized persons to enter. No fence shall conform to Sub-article 450-C, as applicable. Where a shall be required where all current-carrying conductors and fence enclosure is provided, a curb shall be provided high parts entering the transformers are lead-sheathed and protected enough to contain the oil from the largest of the oil-filled from physical damage, or are enclosed in metal raceway; the transformers, but in no case less than six inches high. A drain sheath, or the metal raceway, shall be wiped-in or screwed to shall be provided from the enclosures to carry any oll which it the transformer cases, making a watertight construction, and all may contain well away from the building. Where the roof is not sheaths or raceways and the cases of the transformers shall be of two-hour flre-resistlve construction, the enclosures shall effectively grounded. conform to Sub-article 450-C, as applicable. When the enclosure is adjacent to platforms, balconies, roofs, SUBSTANTIATION: The vagueness of this language renders thls windows or doors, suitable screens shall be provided to prevent section legally unenforceable. See the attached opinion* of the persons coming into contact with current-carrying parts, or San Diego City Attorney. bring conducting materials into contact with them. *See Border County Div. IAEI substantiation for proposal for SUBSTANTIATION: The vagueness of this language renders this 110-16(a). section legally unenforceable. See the attached opinion* of the PANEL RECOMMENDATION: Reject; San Diego City Attorney. PANEL COMMENT: The intent is covered by Panel action on *See Border County Div. IAEI substantiation for proposal for Proposal No. 22. 110-16(a). VOTE ON PANEL RECOMMENDATION: Unanlmously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Already covered by Sections 110-30 through 110-34, No additional clarification would be achieved by this proposal. 450-41: Reject CNP 13 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Oiv. IAEI 28 Delete450-41. ~]B~-YA-N~'IATION: The use of the word "practicable" renders this section legally unenforceable. See the attached opinion* of the 450-27-(New): Accept CMP 13 San Diego City Attorney. SUBMITTER: John C. Dutton, Rome, GA *See Border County Div. IAEI substantiation for proposal for ][R-O-PD-~ki-?.• 25 110-16(a). Noncombustible Insulant Transformers. Transformers PANEL RECOMMENDATION: Reject. with a noncombustible dielectric fluid approved for the purpose PANEL COMMENT: The present wording adequately reflects the shall be permitted to be installed indoors or outdoors. Such Panel's intent. transformers.installed indoors and rated over 35000 volts shall VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be installed in a vault. For the purposes of this section, a noncombustible dielectric fluid is one which does not have a flash point or autoignition temperature, and is not flammable in air. 450~42, Exception: Reject CMP 13 SUBSTANTIATION: Recent regulatory actions have eliminated the SUBMITTER: JeromeM. Frank Sorgel, Div/Square D Co. use of PCB's (one of the constituents of askarel liquids) in new 29 Deletethe exception. transformers, requiring the development of new types of ~O~-~TANTIATION: Section 450-25 requires that oll-lnsulated transformers and the formulation of new dielectrics. transformers installed indoors be placed in a vault. The tank The wording of NEC Article 450, Part B is the basis for of an oil-filled transformer under fault conditions can rupture acceptance of stated transformer designs and specified and burning oil can be emitted. Oil floats on water and burning dielectrics. Transformers using a noncombustible dielectric oil would float on water and spread throughout a building. It fluid are available, and the proposed NEC section will provide does not make engineering sense to reduce the flre-resistance acceptance of installations utilizing these new types of rating from three hours down to one hour under the above transformers. conditlons. PANEL RECOMMENDATION: Accept as Revised: In addition, since transformer vaults contain other electrical Change lines I-3 to read: Nonflammable fluid-insulated gear which could produce serious and hazardous conditions if transformers. Transformers insulated with a dielectric fluid exposed to water, automatic sprinkling of vaults containing identified as nonflammable shall be..." In second paragraph, electrical equipment is highly undesirable and should not be change the word "noncombustible" to "nonflammable." Renumber permitted by the Natlonal Electrical Code. from "450-27" to "450-24." Renumber existing 450-24, 450-25, PANEL RECOMMENDATION: Reject. and 450-26 to 450-25, 450-26 and 450-27. PANEL COMMENT: The Panel does not agree with the supporting VOTE ON PANEL RECOMMENDATION: comment. AFFIRMATIVE: 12. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. NEGATIVE: Thomas. EXPLANATION OF VOTE: THOMAS: The revision of this section, as proposed by CMP-13, would be acceptable If the proposed second paragraph were 450-42, Exception: Accept CMP 13 revised as follows: SUBMITTER: Arthur F. Clchy, Fenwal, Inc., Ashland, MA For the purposes of this section, a nonflammable dielectric ~ 30 Revise exception as follows: fluid is one which does not have a flash point or fire point x---~-~lon: Where transformers are protected with automatic below boiling and has an autoignltion temperature greater than sprinkler, water spray, carbon dloxtde or halon, construction of lO00°F (538°C). one-hour rating shall be permitted. ISUBSTANTIATION: Since the writing of thts code, halon has been selected as the extinguishing agent on numerous transformer vault installations. As an exemple, attached sheets 450-28-(New): Reject CMP 13 representing installations in transformer vaults by ~emval, Inc. SUBMII-[ER: O. E. Dillon, Border County Div. IAEI have been supplied to the panel. 26 Add new section as follows: PANEL RECOMMENDATION: Accept. Installation of Transformers on Poles. Where VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. transformers are installed on poles or pole structures, ANSI COMMENT ON VOTE: C2-1977, Rules fop Overhead Electric Line Construction of the BECKMANN: Reco,mend "vault" be added before "construction." California Public Utilities Commission shall apply. SUBSTANTIATION: The vagueness of thls language renders thls 216 450-43, Exception: Accept CMP 13 balanced load should, necessarily be protected against possible SUBMITTER: Arthur F. Cichy, Fenwal, Inc., Ashland, MA damage from arbitrarily applying an unbalanced load which does FR-O-PO~I~C~." 31 Revise exception as follows: not exceed the nominal rated load of the transformer but may x--E'-x~eptiOn: Where transformers are protected with automatic seriously overload portions of its windings. sprinkler, water spray, carbon dioxide or halon, construction of SUBSTANTIATION: I believe that the trade magazines, In the last one-hour rating shall be permitted. year or so, have cultivated a hopeless state of confusion in the SUBSTANTIATION: Since the writing of this code, halon has been minds of many electrical inspectors and electrical engineers selected as the extinguishing agent on numerous transformer about the Code requirements which apply to the installation of vault installations. As an example, attached sheets ~/ transformers. In essence, the thrust of the published articles representing installations in transformer vaults by Fenwal, Inc. seems to have it that the Code required primary overcurrent have been supplied to the panel. protection called for in Section 450 must be augmented, as a PANEL RECOMMENDATION: Accept. general rule, by secondary-slde overcurrent devices to protect VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. the "secondary circuit conductors" to conform to Section 240 regardless of th E ampacity of these conductors, the rating of the transformer or the maximum current that the primary overcurrent would permit to become available to the secondary 450-43(b): Reject CMP 13 terminals 'under any arbitrarily imposed load conditions. SUBMITTER: D. F. Wartzok, Fort Wayne, IN It seems to be ignored, that there is generally no reason to !~R-O-PO-S-AL: 32 Add a new paragraph to existing subpart (b) as expect that a transformer serving a normally balanced load will ever have the load spontaneously revert to any seriously A vault for transformers using PCB-based cooling fluid shall unbalanced condition due to some secondary circuit defect. In have a door sill or curb of sufficient height to confine within other words, there is no reason to expect that the complication the vault the fluid from all of the transformers. End of or added expense of providing secondary overcurrent protection conduits extending through the floor shall be at a height not can be Justified as anything other than an academic argument. less than the door sill or curb height. In the final analysis, any person sufficiently inept to SUBSTANTIATION: The Federal Toxic Substances Control Act intentionally apply a seriously unbalanced load to a susceptible contains specific requirements regarding the handling and transformer could be expected to also bypass the safeguards disposal of polychlorlnated biphenyls, commonly known as PCB's intended to protect either the transformer or circuit conductors. which are considered hazardous to the environment. Large PANEL RECOMMENDATION: Reject. liquld-cooled transformers sometimes contain a cooling fluid PANEL COMMENT: The Panel is uncertain of the intent of the which is based on PCB. Proposal. The present wording in Article 450-43(b) does not adequately VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. protect against the escape of PCB-based transformer cooling fluids into the environment. The proposed additional paragraph specifies vault construction so that the PCB-based transformer cooling fluid from all transformers in a vault (instead of Just ARTICLE 460 -- CAPACITORS the largest) will b~dequately retained in case of transformer tank rupture or leakage, until it can be cleaned up. 460-6(a): Accept ~ 13 PANEL RECOMMENDATION: Reject. SUBMITTER: TSC-Nominal Voltage PANEL COMMENT: This Proposal could result in conflict with I~ 36 In the second line add "nominal" after "50 volts." later EPA Guidelines. ~7]I~SnFA-N7"IATION: To obtain uniformity of voltage levels and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ratings throughout the Code. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 450145(e): Accept CMP 13 SUBMITTER: J. Brooks Semple, ASHRAE/NFPA Std. 90A ~AL: 33 Delete "automatic closing dampers of not less 460-Part A: Accept CMP 13 than No. 10 MSG steel." Insert "Fire dampers which comply with SUBMITTER: C~ 13 Paragraph 3-3.7.1.2 of NFPA 90A.N I~TOI}I~'AL-~.• 36A Revise Title of Part A to read: 600 Volts, SUBSTANTIATION: 1. Present wording does not comply with other and Under. NFPA standards SUBSTANTIATION: To comply with the Technical Subcommittee 2. IOMSGsteel is a material specification and there is no recommendation on nominal voltages. substantiation of its effectiveness to stop fire. PANEL RECO~'6VlEMDATION: Accept. 3. Para. 3-3.7.1.2 is a performance specification which VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. includes substantiation of its effectiveness. PANEL RECOMMENDATION: Accept as Revised: (el Dampers. All ventilation openings to the indoors shall be provided with automatic closing fire dampers that operate in 460-7: Accept CMP 13 response to a vault fire. Such dampers shall possess a standard SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. fire rating of not less than 1 I/2 hours. Fine Print Note: See I}IIOI~)-S'A-L-~: 37 Revise as follows: Standard for Fire Dampers, ANSI Z233.1-1972. ~Power Factor Correction-Motor Circuit. The total VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. kilovar rating of capacitors that are connected on the load side of a motor controller shall not exceed the value required to raise the no-load power factor of the motor to unity. Capacitors so connected shall be permitted only in applications 450-46, Exception-(New): Reject CMP 13 where the motor is not subject to unusual switching service such SUBMITTER: Charles B. Kish, The Travelers Insurance Co. as plugging, rapid reversals, reclosings, Jogging, or other 34 Add a new exception as follows: similar operations which could generate over-voltages and ~ion: Areas containing Askarel transformers should never over-torques. have drain or other pipe holes to the outside that would allow Delete the exception. liquid to escape. Proper diking or other means of containing SUBSTANTIATION: The service conditions cited in italicized total liquid spillage should be constructed. Handling and "Exceptionu as not permitted when capacitors not exceeding 50 disposal of spilled liquid should be to legal guidelines. percent of the kVA rating of the motor input are used are SUBSTANTIATION: "Askarel" is a PCB (polychlorinated biphenyl) equally unacceptable when capacitor rating is selected on basis which is sometimes mixed with chlorobenzene to give particular of limiting motor no-load power factor to unity. We believe viscosity characteristics. PCB has been on the E.P.A. these application guides have been followed in the past when (Environmental Protection Agency) Toxic Pollutant List for using capacitors for motor power factor correction~ Citing the several years. It Is an incredible sta~le chemical composition unacceptable service conditions only in the italicized that could gradually accumulate in certain ecological systems. "Exception," by inference, implies such service conditions are Any spillage would be a hazard to health and expensive to clean acceptable when capacitor rating is set to limit motor no-load up. power factor to unity. With capacitor ratings so set and with PANEL RECOMMENDATION: Reject. capacitors connected on load side of motor controller, PANEL COMMENT: This Proposal could result in conflict with over-voltages and over-torques could also be generated if the later EPA Guidelines. motor is subject to plugging, rapid reversals, rec)osings, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Jogging, etc. If capacitor ratings up to 50 percent of the kVA rating of the motor input are permitted to be connected on load side of motor controller, the motor is subjected to an over-voltage limited 450-XX: Reject CMP 13 only by saturation ~ach time the motor is disconnected. These SUBMITTER: R. C. Cathcart, Kalamazoo, MI over-voltages may range from 1.2 to 1.6 times normal voltage and 35 AmendSection 450 to state specifically the will contribute to premature failure of the motor insulation ~f the NEC with respect to protecting the primary and system. secondary transformer windings (themselves) frem overcurrent, .Moreover, setting capacitor rating as 50 percent of the kVA with the object being to make a clear distinction from the rating of the motor input does not afford, in most cases, an overcurrent consideration for the primary and secondary circuit appreciable gain in power factor over that achieved by setting conductors which are involved with tranformer installations. capacitor rating to limit motor no-load power factor to unity. This should focus on whether transformers designed for a In support of the preceding sentence, Exhibit A (attached) 217 450-43, Exception: Accept CMP 13 balanced load should, necessarily be protected against possible SUBMITTER: Arthur F. Cichy, Fenwal, Inc., Ashland, MA damage from arbitrarily applying an unbalanced load which does FR-O-PO~I~C~." 31 Revise exception as follows: not exceed the nominal rated load of the transformer but may x--E'-x~eptiOn: Where transformers are protected with automatic seriously overload portions of its windings. sprinkler, water spray, carbon dioxide or halon, construction of SUBSTANTIATION: I believe that the trade magazines, In the last one-hour rating shall be permitted. year or so, have cultivated a hopeless state of confusion in the SUBSTANTIATION: Since the writing of this code, halon has been minds of many electrical inspectors and electrical engineers selected as the extinguishing agent on numerous transformer about the Code requirements which apply to the installation of vault installations. As an example, attached sheets ~/ transformers. In essence, the thrust of the published articles representing installations in transformer vaults by Fenwal, Inc. seems to have it that the Code required primary overcurrent have been supplied to the panel. protection called for in Section 450 must be augmented, as a PANEL RECOMMENDATION: Accept. general rule, by secondary-slde overcurrent devices to protect VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. the "secondary circuit conductors" to conform to Section 240 regardless of th E ampacity of these conductors, the rating of the transformer or the maximum current that the primary overcurrent would permit to become available to the secondary 450-43(b): Reject CMP 13 terminals 'under any arbitrarily imposed load conditions. SUBMITTER: D. F. Wartzok, Fort Wayne, IN It seems to be ignored, that there is generally no reason to !~R-O-PO-S-AL: 32 Add a new paragraph to existing subpart (b) as expect that a transformer serving a normally balanced load will ever have the load spontaneously revert to any seriously A vault for transformers using PCB-based cooling fluid shall unbalanced condition due to some secondary circuit defect. In have a door sill or curb of sufficient height to confine within other words, there is no reason to expect that the complication the vault the fluid from all of the transformers. End of or added expense of providing secondary overcurrent protection conduits extending through the floor shall be at a height not can be Justified as anything other than an academic argument. less than the door sill or curb height. In the final analysis, any person sufficiently inept to SUBSTANTIATION: The Federal Toxic Substances Control Act intentionally apply a seriously unbalanced load to a susceptible contains specific requirements regarding the handling and transformer could be expected to also bypass the safeguards disposal of polychlorlnated biphenyls, commonly known as PCB's intended to protect either the transformer or circuit conductors. which are considered hazardous to the environment. Large PANEL RECOMMENDATION: Reject. liquld-cooled transformers sometimes contain a cooling fluid PANEL COMMENT: The Panel is uncertain of the intent of the which is based on PCB. Proposal. The present wording in Article 450-43(b) does not adequately VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. protect against the escape of PCB-based transformer cooling fluids into the environment. The proposed additional paragraph specifies vault construction so that the PCB-based transformer cooling fluid from all transformers in a vault (instead of Just ARTICLE 460 -- CAPACITORS the largest) will b~dequately retained in case of transformer tank rupture or leakage, until it can be cleaned up. 460-6(a): Accept ~ 13 PANEL RECOMMENDATION: Reject. SUBMITTER: TSC-Nominal Voltage PANEL COMMENT: This Proposal could result in conflict with I~ 36 In the second line add "nominal" after "50 volts." later EPA Guidelines. ~7]I~SnFA-N7"IATION: To obtain uniformity of voltage levels and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ratings throughout the Code. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 450145(e): Accept CMP 13 SUBMITTER: J. Brooks Semple, ASHRAE/NFPA Std. 90A ~AL: 33 Delete "automatic closing dampers of not less 460-Part A: Accept CMP 13 than No. 10 MSG steel." Insert "Fire dampers which comply with SUBMITTER: C~ 13 Paragraph 3-3.7.1.2 of NFPA 90A.N I~TOI}I~'AL-~.• 36A Revise Title of Part A to read: 600 Volts, SUBSTANTIATION: 1. Present wording does not comply with other and Under. NFPA standards SUBSTANTIATION: To comply with the Technical Subcommittee 2. IOMSGsteel is a material specification and there is no recommendation on nominal voltages. substantiation of its effectiveness to stop fire. PANEL RECO~'6VlEMDATION: Accept. 3. Para. 3-3.7.1.2 is a performance specification which VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. includes substantiation of its effectiveness. PANEL RECOMMENDATION: Accept as Revised: (el Dampers. All ventilation openings to the indoors shall be provided with automatic closing fire dampers that operate in 460-7: Accept CMP 13 response to a vault fire. Such dampers shall possess a standard SUBMITTER: J. J. Kark, National Electrical Manufacturers Assn. fire rating of not less than 1 I/2 hours. Fine Print Note: See I}IIOI~)-S'A-L-~: 37 Revise as follows: Standard for Fire Dampers, ANSI Z233.1-1972. ~Power Factor Correction-Motor Circuit. The total VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. kilovar rating of capacitors that are connected on the load side of a motor controller shall not exceed the value required to raise the no-load power factor of the motor to unity. Capacitors so connected shall be permitted only in applications 450-46, Exception-(New): Reject CMP 13 where the motor is not subject to unusual switching service such SUBMITTER: Charles B. Kish, The Travelers Insurance Co. as plugging, rapid reversals, reclosings, Jogging, or other 34 Add a new exception as follows: similar operations which could generate over-voltages and ~ion: Areas containing Askarel transformers should never over-torques. have drain or other pipe holes to the outside that would allow Delete the exception. liquid to escape. Proper diking or other means of containing SUBSTANTIATION: The service conditions cited in italicized total liquid spillage should be constructed. Handling and "Exceptionu as not permitted when capacitors not exceeding 50 disposal of spilled liquid should be to legal guidelines. percent of the kVA rating of the motor input are used are SUBSTANTIATION: "Askarel" is a PCB (polychlorinated biphenyl) equally unacceptable when capacitor rating is selected on basis which is sometimes mixed with chlorobenzene to give particular of limiting motor no-load power factor to unity. We believe viscosity characteristics. PCB has been on the E.P.A. these application guides have been followed in the past when (Environmental Protection Agency) Toxic Pollutant List for using capacitors for motor power factor correction~ Citing the several years. It Is an incredible sta~le chemical composition unacceptable service conditions only in the italicized that could gradually accumulate in certain ecological systems. "Exception," by inference, implies such service conditions are Any spillage would be a hazard to health and expensive to clean acceptable when capacitor rating is set to limit motor no-load up. power factor to unity. With capacitor ratings so set and with PANEL RECOMMENDATION: Reject. capacitors connected on load side of motor controller, PANEL COMMENT: This Proposal could result in conflict with over-voltages and over-torques could also be generated if the later EPA Guidelines. motor is subject to plugging, rapid reversals, rec)osings, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Jogging, etc. If capacitor ratings up to 50 percent of the kVA rating of the motor input are permitted to be connected on load side of motor controller, the motor is subjected to an over-voltage limited 450-XX: Reject CMP 13 only by saturation ~ach time the motor is disconnected. These SUBMITTER: R. C. Cathcart, Kalamazoo, MI over-voltages may range from 1.2 to 1.6 times normal voltage and 35 AmendSection 450 to state specifically the will contribute to premature failure of the motor insulation ~f the NEC with respect to protecting the primary and system. secondary transformer windings (themselves) frem overcurrent, .Moreover, setting capacitor rating as 50 percent of the kVA with the object being to make a clear distinction from the rating of the motor input does not afford, in most cases, an overcurrent consideration for the primary and secondary circuit appreciable gain in power factor over that achieved by setting conductors which are involved with tranformer installations. capacitor rating to limit motor no-load power factor to unity. This should focus on whether transformers designed for a In support of the preceding sentence, Exhibit A (attached) 217 depicts motor power factor improvement over load range from 0 to The most important reason for this change is that single pole 125 percent load with corrective kVAR at value to: switching of low voltage capacitors is hazardous. Single pole (a) raise motor no-load power factor to unity; equipments are usually open type knife switches where normal (b) equal 50 percent of the kVA rating of the motor input. switching or closing on faults could cause arcs, splattering In the first two examples depicted, 7.5 HP, 1200 RPM & 10 HP, molten metal or flying parts. The workman may not open all 900 RPM ratings, the motor no-load KVAR is more than 50 percent ungrounded poles and leave the capacitor energized when it of the kVA rating of the motor input. In these cases, which are should be de-energized. typical of ones having inherently low motor power factor and PANEL RECOMMENDATION: Accept as Revised: where power factor improvement would be most beneficial, the I Change (2) to read: "The disconnecting means shall open all italicized "Exception" is simply not applicable and thus affords ungrounded conductors simultaneously." The rest of the Code no potential for additional gain in power factor improvement. remains the same. In the second two examples, 40 HP, 1200 RPM & 200 HP, 1800 RPM VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. ratings, corrective kVAR as value to raise motor no-load power factor to unity yeilds better power factor improvement up through 75 percent load than attained by corrective KVAR equal to 50 percent of the kVA rating of the motor input. For loads ARTICLE 470 -- RESISTORS AND REACTORS above 75 percent, the converse is true, but there is no notable overall difference ih power factor improvement between the two 470, Part A: Reject CMP 13 approaches. SUBMITTER: TSC-Nominal Voltage I PANEL RECOMMENDATION: Accept as Revised: PROPOSAL: 40 Revise the title as Follows:, Insert in first sentence between "motor to" the words "branch ~00 Volts, Nominal, or Less circuit." SUBSTANTIATION: To obtain uniformity of voltage levels and VOTE ON PANEL RECOMMENDATION: ratings throughout the Code. AFFIRMATIVE: 10. PANEL RECO~ENDATION: Reject. NEGATIVE: Beckmann, Jefferson, Tudor. PANEL COMMENT: The present wording adequately reflects the EXPLANATION OF VOTE: Panel's intent. BEC!

460-B(c)(1),(2),and(3): Accept C~ 13 SUBMITTER: StanleyK. Hall, Duquesne Light Company 710-3(a) and (b): Accept CMP 13 ]~-OII~'TAt-~.• 39 Revise as follows: SUBMITTER: H. F. van der Voort, Cleveland, OH -~isconnecting Means. l~J~rO-F~B~-~." 43 Add the words "in rigid nonmetallic conduit u to (I) A disconnecting means shall be provided in each the first sentence, paragraph "(a) Aboveground Conductors" after ungrounded conductor to simultaneously open all ungrounded "in intermediate metal conduit" and before "in cable trays." conductors for each capacitor bank. In paragraph "(b) Underground Conductors," amend the last (2) The disconnecting means shall be permitted to sentence before Table 710-3(b) b~ deleting the words "encased in disconnect the capacitor from the line as a regular operating not less than 3 inches of concrete." procedure. SUBSTANTIATION: Schedule 40 rigid PVC conduit is suitable in (3) The rating of the disconnecting means shall not be less applications where the potential exceeds 600 volts. High than 135 percent of the rated current of the capacitor. voltage, high current short circuit tests were conducted on 4 SUBSTANTIATION: This proposal will eliminate single pole inch Schedule 40 Rigid PVC Conduit under a wide •range of switching of low voltage capacitors. This practice is already conditions. The results prove that the conduit exhibits little obsolete and not in general use. This is already a requirement or no signs of deterioration or physical damage due to the for capacitors over 600 volts. Art. 460-24 (a). explosions and high temperatures. The report of the results of 218

\ depicts motor power factor improvement over load range from 0 to The most important reason for this change is that single pole 125 percent load with corrective kVAR at value to: switching of low voltage capacitors is hazardous. Single pole (a) raise motor no-load power factor to unity; equipments are usually open type knife switches where normal (b) equal 50 percent of the kVA rating of the motor input. switching or closing on faults could cause arcs, splattering In the first two examples depicted, 7.5 HP, 1200 RPM & 10 HP, molten metal or flying parts. The workman may not open all 900 RPM ratings, the motor no-load KVAR is more than 50 percent ungrounded poles and leave the capacitor energized when it of the kVA rating of the motor input. In these cases, which are should be de-energized. typical of ones having inherently low motor power factor and PANEL RECOMMENDATION: Accept as Revised: where power factor improvement would be most beneficial, the I Change (2) to read: "The disconnecting means shall open all italicized "Exception" is simply not applicable and thus affords ungrounded conductors simultaneously." The rest of the Code no potential for additional gain in power factor improvement. remains the same. In the second two examples, 40 HP, 1200 RPM & 200 HP, 1800 RPM VOTE ON PANEL RECOI~ENDATION: Unanimously Affirmative. ratings, corrective kVAR as value to raise motor no-load power factor to unity yeilds better power factor improvement up through 75 percent load than attained by corrective KVAR equal to 50 percent of the kVA rating of the motor input. For loads ARTICLE 470 -- RESISTORS AND REACTORS above 75 percent, the converse is true, but there is no notable overall difference ih power factor improvement between the two 470, Part A: Reject CMP 13 approaches. SUBMITTER: TSC-Nominal Voltage I PANEL RECOMMENDATION: Accept as Revised: PROPOSAL: 40 Revise the title as Follows:, Insert in first sentence between "motor to" the words "branch ~00 Volts, Nominal, or Less circuit." SUBSTANTIATION: To obtain uniformity of voltage levels and VOTE ON PANEL RECOMMENDATION: ratings throughout the Code. AFFIRMATIVE: 10. PANEL RECO~ENDATION: Reject. NEGATIVE: Beckmann, Jefferson, Tudor. PANEL COMMENT: The present wording adequately reflects the EXPLANATION OF VOTE: Panel's intent. BEC!

\ REPORT OF CODE-MAKING PANEL NO. 22 be adequate. Overcurrent protectioh should be as close as practicle, but 25 feet is too restrictive. VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 8. ARTICLE445 -- GENERATORS NEGATIVE: Flach, Scalone. EXPLANATION OF VOTE: 445-I: Reject CMP 22 FLACH: I agree that 25 feet may be too short for large SUBMITTER: IdahoChapter IAEI machines, but there should be some statement in the Article ]5~-Olb-O-S'A~-~." 1 AmendSection 445-1 to include Article 240. which requires overcurrent protection for the conductors ~]I~rANTIATION: 240-21 tells us all conductors shall be connected to the generator. protected at point of supply. The inherent design of a SCALONE: The installation of an unprotected feeder for great enerator only protects the generator itself. Nowhere in distances within a building might cause a greater threat to ~rticle 445 does it give any specific overcurrent protection for human life such as fire, explosion or electrocution, than would the conduEtor leading from the generator. be caused by the lack of emergency power. I suggest modifying These generators can be changed in the field to a larger the proposed wording: generator without any knowledge of conductor ~npacity or "The length of exposed feeder installed from the generator overcurrent requirements thereby causing an overload on the terminals to the first overcurrent protective device shall not conductors and creating a fire hazard. In some installations exceed 25 feet." the conductors leading from the generator to the first overcurrent device is greater than 100 feet. See Proposal No. 3 for 445-5. "PANEL RECOMMENDATION: Reject. 445-6: Accept CMP 22 PANEL COMMENT: Unduly restricting design for larger units where SUBMITTER: TSC-Nominal Voltage other methods to prevent overloading of conductors have shown to I~TOIR)~L-~.4 Change"generators of more than 150 volts to be adequate. Supporting comment is not persuasive. This grou-~-u-6~--to read "generators operated at more than 150 volts to article outlines requirements for protection of generators. iground., Other sections of the NEC cover conductor overcurrent SUBSTANTIATION: To conform to the guidelines established by the protection. Modifications of systems must be reviewed TSC on Nominal Voltages. completely for compliance with all rules applicable in the NEC. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. AFFIRMATIVE: g. NEGATIVE: Flach. EXPLANATION OF VOTE: FLACM: I don't think adding Article 240 to the list of other ARTICLE 480 -- STORAGE BATTERIES Articles will create any controversy. By doing this, Code users will be alerted to the fact that the inherent design of a 480-5(b):Accept CMP 22 generator does not protect conductors connected to the generator SUBMITTER: TSC-Nominal Voltage output terminals. I~ROIoI)~3~-~.• 5 Add "nominal" after "24 volts" to read "(24 vo-'61"t-~7-5,nominal)." SUBSTANTIATION: To conform to the guidelines established by the i TSC on Nominal Voltages. 445-5: Reject CMP 22 PANEL RECOI~MENDATION: Accept SUBMITTER: GeorgeW. Flach, New Orleans, LA VOTE ON PANEL RECOMMENDATION: Unanimously AffirmatiVe. 2 Reviseby adding "and neutral" after "phase ~rs." The sentence will then read: "The ampacity of the phase conductors and neutral from the generator terminals to the first overcurrent device shall not be less than 115 percent of ARTICLE 700 -- EMERGENCY SYSTEMS the nameplate current:rating of the generator. SUBSTANTIATION: Clarification. Article 700: Reject CMP 22 PANEL RECOMMENDATION: Reject. SUBMITTER: H. K. Glenn, Pacific Coast Electrical Assn. PANEL COMMENT: CMP agrees with the intent of the Proposal see ]~-OPO~'-A-L-~.'6 CemblneArticles 700 and 750. actlon on Proposal No. 2A, Section 445-5. ~'I]I)'S'TA)~TIATION: Adopt the report of CMP TSC to combine Articles VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 700 and 750 r Complete text as shown on pages 391, 392, 393, 394 of the "Preprint of the proposed amendments for the 1978 National Electrical Code." NFPA NO. 70 PR 78. The present separation of the articles, both of which deal 445-5: Accept CMP 22 with alternate power sources and distribution systems intended SUBMITTER: CMP 22 to be functional when normal power supplies are disrupted, is I~TOITO-S')~-~." 2A Add a sentence to the end of 445-5 as follows: illogical and is a source of conflict in application and be permitted to size the neutral conductors in enforcement. accordance with Section 220-22. The TSC report was well conceived and the integrated subject SUBSTANTIATION: To clarify requirements for sizing the neutral. matter provides a much more coherent coverage of alternate Power To be consistent in sizing the neutral with other sources and Systems. The supporting comment by CMP 22 which accompanied the distribution methods. proposal thoroughly covers the subject and is still pertinent. PANEL RECOMMENDATION: Accept as revised. It shall be permitted The Correlating Co¢mnittee (see Secretary's note) apparently to slze the neutral conductors in accordance with Section agreed with the developed material, but unfortunately the 220-22. Conductors which must carry ground-fault currents shall assignment to "process new material in the appropriate articles" not be smaller than required by Section 250-23(b). was not accemplished. Such action to pull apart the work of the PANEL COII~ENT: Where the generator neutral is not grounded at TSC would be ill-advised and would destroy the logical Its terminal, the neutral cohductor must be of adequate size to arrangement. carry ground-fault current. PANEL RECOMMENDATION: Reject VOTE ON PANEL RECO~B~ENDATION: Unanimously Affirmative. PANEL COMMENT: See CMP action on Proposal No. 7. The Correlatlng ~emmittee has instructed CMP 22 to keep the articles separate. VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. 445-5: Reject CMP 22 COW,lENT ON VOFE: SUBMITTER: IdahoChapter IAEI FLACH: Separating this proposal as has been done in Proposal 3 Amend445-5 by adding another sentence stating NOS. 21A through 21S should reduce this confusion between ~ductor shall not be over 25 feet in length and shall requirements for emergency, legally required stand-by, and terminate with a single circuit breaker or a single set of fuses optional stand-by systems. that will limit the load to the ampacity of the conductors." SUBSTANTIATION: 250-5(d) states that generators are a separately derived system. If they are such we should have some rules for giving the conductors from the generator proper Article 700 and 750-(New)(HOD 1978 NEC): Reject CMP 22 protection. There are times when it is hard to install an SUBMITTER: CMP 22 overcurrent device at the generator location. If we used a 25 RTOIIO~3XLr~.• 7 Reportof CMP TSC to combine Articles 700 and 750 foot tap rule from the generator to the overcurrent device it would prevent installations of great distance from the generator ARTICLE 700 - ALTERNATE POWER SYSTEMS to the overcurrent device. A. General 240-21 tells us all conductors shall be protected at point of ' 700-1. Scope. The provisions of this article apply to the supply. The inherent design of a generator only protects the installation, operation, and maintenance of systems consisting generator itself. Nowhere in Article 445 does it give any of circuits and equipment intended to distribute and control specific overcurrent protection for the conductor leading from electricity for illumination and/or power when the normal supply the generator. or system is interrupted. Unless specifically referenced, these See Proposal No. 1 for 445-I. provisions do not apply to health care facilities which are PANEL RECOMMENDATION: Reject covered by Article 517. j PANEL COMMENT: Unduly restricting design for larger units where, 700-2. An alternate power system shall be classified as one of other methods to prevent overloading of conductors have shown to the following: 332 1 ARTICLE 500 -- HAZARDOUS (CLASSIFIED) LOCATIONS it has an electricalresistivity equal to or less that 102 ohm-cm. 500-1: Accept CMP 14 Group F - that a dust be classified electrically, SUBMITTER: CMP 14 semi-conductive if it has an electrical resistivity equal to'or PROPOSAL: IA Add the following at end of fine print note less than 108 ohm-cm, but greater than 102 ohm-cm. ~g to NFPA No. 493: and Installation of Intrinsically Group G - that a dust be classified electrlcally Safe Instrument Systems in Class I Hazardous Locations ANSI/ISA non-conductive if it has an electrical resistivity greater than RP 12.6-1976. \ SUBSTANTIATION: No reference or informatlon on installation ~U~L KtcOMMENOATION: Accept as Revised:' requirements for intrinsically safe systems. ANSI/ISA RP 12.6 In Group P, remove the words "or any similar dust" and replace is such a Standard. with the word "and." Add to the definition of Group F: "...but PANEL RECOMMENDATION: Accept. equal to or less than 108ohm-cm.. Add the words "or VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. combustible" to Group G before the word "plastics" and remove the comma after "plastics." VOTE ON PANEL RECOMMENDATION: AFFIRMATIVE: 16. 500-1: Accept CMP 14 NEGATIVE: Adams, Magison. Secretary's Note: It was the action of the Correlating COMMENT ON VOTE: Committee that further consideration be given to the comments EWERS: I would like to point out a problem that •arises with expressed in the voting. this classification. Coal and coke dust is now classified as SUBMITTER: CMP 14 Group F. However, with this proposal coal dust may be in Group PROPOSAL: IB In first paragraph add: "due to flammable F or in Group G depending on moisture content. vapors, combustible dust, or ignitible fiber~ or flyings." SHORT: This proposal clarifies the classification of dusts. SUBSTANTIATION: The existing statement in the first paragraph My concern js that there is no reference table that gives the is not complete. The only fire and explosion hazards covered by resistivity of dusts which is readily available to the user. Articles 500-503 are due to flammable vapors, combustible dust, EXPLANATION OF VOTE: or ignitible fibers or flyings. See 510-1 for similar statement ADAMS: I believe that by adding a highly technical for Articles 511 through 517. specification for grouping dusts, even in a fine print note, the I PANEL RECOMMENDATION: Accept as Revised: true explosive potential of the materials are lost. The Add the words "gases or" after "flammable" in Proposal. grouping in this proposa! is questionable and to make this VOTE ON PANEL RECOMMENDATION: change at this time, with almost sure revision in the next Code, AFFIRMATIVE: 17. would be a mistake. NEGATIVE: Conaway. MAGISON: Proposal No. 3 provides quantitative definitions of EXPLANATION OF VOTE: Groups E, F and G, and is therefore a significant improvement CONAWAY: I have voted negative as I belie@e that the proposal over the language of the 1978 NEC. However, Proposal No. 5 is a should be changed to include flammable liquids. Liquids are mere significant improvement in that it clearly distinguishes mentioned in paragraph 2. between conductive dusts and nonconductive dusts, and is The proposal should read: "Due to flan~nable vapors or therefore in accord with Proposal No. 18 as modified by the liquids, combustible dust, or ignitable fibers or flyings." Panel.

500-1, FPN: Accept CMP 14 500-2: Accept CMP 14 SUBMITTER: Howard P. Kempsell, Chairman of NFPA Sectional SUBMITTER: CMP 14 on Chemistry Laboratories 3A Reword third fine print note to read: PROPOSAL: 2 Add new paragraph to fine print note as follows: ~urposes of testing, approval, and area classification ]~o-r-eTe~trical classification of laboratory areas, see Standard various air mixtures .... " for Fire Protection of Laboratories Using Chemicals NFPA 45-1975. • SUBSTANTIATION: For clarification. SUBSTANTIATION: Chemistry Laboratories have traditionally been PANEL RECOMMENDATION: Accept. considered non-hazardous (non- classified) areas, as far as VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. electrical equipment is concerned. This recognizes the relatively small quantities of flammable liquid that might be involved in a spill and the presence of other more obvious sources of ignition, such as hot plates or bunsen burners (both 500-2: Accept CMP 14 of which are indispensable laboratory equipment). SUBMITTER: Idaho Chapter IAEI PANEL RECOMMENDATION: Accept as Revised: 4 In Section 500-2(a) second line, delete the word Add reference to NFPA 45-1975 to list on page i48 of the NEC. ~on" and replace it with the words "explosive, VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. combustible or ignitible." In the third line delete the word "or," place a comma after the word "dust," and add "fiber or flyings." In the fifth line delete the word "or," delete the period after the word "dust" and add a comma and add the words 500-2: Accept CMP 14 "fiber or flyings." SUBMITTER: E. C. Magison, Honeywell Inc. The first paragraph of Section 500-2(a) would then read: PROPOSAL: 3 Revisedefinitions of Groups E, F, and G as "Equipment shall be approved not only for the class of location but also for the explosive, combustible, or ignitible Group E: ...similarly hazardous characteristics having properties of the specific gas, vapor, dust, fiber or flyings resistivity of 102 ohm-cm or less. that. will be present. In addition, equipment shall not have Group F: ...explosion hazard, or any similar dust having exposed any surface that operates at a temperature in "excess of resistivity greater than 102 ohm-cm but less than lOB ohm-cm. the ignition temperature of the specific gas, vapor, dust, Group G: ...flour, starch, grain, plastics, or chemical dusts fiber, or flyings." having resistivity greater than 108 ohm-cm. SUBSTANTIATION: Class Ill locations have an approval for class SUBSTANTIATION: This recommendation moves the National propertles as well as Class I and Class II locations. The Electrical Code toward a more definitive classification of properties-(fiber and flyings) of ignitibles in Class Ill dusts. The prevalence of dust in industrial processes (i.e., locations have been left out of the wording in this section and plastic dust, wood dust, etc., which are not presently should not be excluded. The addition of the words "explosive, classified by the Code) dictates a more precise classification combustible, or ignitible" is the wording used in Section 500-4, based on reliable scientific criteria that will aid users of the 500-5 and 500-6 to describe the properties in Class I, Class II National Electrical Code. and Class Ill locations. The National Academy of Sciences (NAS), under contract by the PANEL RECOMMENDATION: Accept. Occupational Safety and Health Administration, set up a Dust VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Test Equipment Panel, staffed by prominent experts who studied / the various methods used for testing the characteristics of I dusts. An objective of this study is to be better able to classify the various dusts according to the Groups E, F, and G 500-2: Reject CMP 14 for hazardous locations, as presently described in the NEC. The SUBMITTER: Ernest C. Magison, Honeywell, Inc. test procedure for evaluating the resistivity of dust used was ~5 Changedefinition to read: the hotplate method being proposed as the International ~E: Atmospheres containing metallic dusts or conductive Electrotechnical Cofmnission test method by Working Group No. 2 carbonaceous dusts which have more than 8 percent total volatile of Subcommittee 31H. Details of the method are explained in material (Carbon black per ASTM D1620, charcoal, coal and coke the attached report.* dusts per ASTM D27~). Conductive dusts are those whose *Attached report has been supplied to CMP. resistivity is equal to or less than 105 ohm-centimeters. The initial study ~ndicated that the present Groups E, F, and Delete Group F definition. G in Article 500 of the NEC were classified according to: SUBSTANTIATION: This proposal is aimed at providing a Ignition temperature of the dusts, and electrical conductivity quantitative definition of conductive dusts and simplifying of the dusts (page 2 of the report). Class II requirements. There is in practice little use made of In analyzing various methods pertaining to the electrical the destinction between Group E (metallic) and Group F resistivity of dusts, one important conclusion of the study (carbonaceous) dusts. The distinction is between conductive (E would better define the resistivity of dusts within the Groups. and F) and non-conductive (G) dusts. Group E - that a dust be classified electrically conductive if The proposed dividing line of 105 ohm-centimeters is based 225 on values presented in ISA SP12.10, Area Classification of Table 500-2(a) Dusts by Groups Hazardous Dust Locations, 1973 and studies conducted by the Group E Atmospheres National Research Council Committee on Evaluation of Industrial Hazards during the past two years. Metals: PANEL RECOMMENDATION: Reject. Aluminum, atomized collector fines PANEL COMMENT: Reject in deference to Proposal No. 3. Aluminum, Flake, A 422 extra fine lining, polished VOTE ON PANEL RECOMMENDATION: Boron, amorphous, commercial (85% B) AFFIRMATIVE: 17. Iron, hydrogen reduced (98% Fe) NEGATIVE: Magison. , Iron, carbonyl (99% Fe) COMMENT ON VOTE: Magnesium, milled, Grade B ADAMS: My affirmative vote to reject this proposal is for Thorium (contains 1.2% 02) much the same reason as Proposal No. 3 and illustrates the Thorium hydride (contains 0.94% H2) possi61e conflicts. Tin atomized (96%~Sn, 2% Pb) EXPLANATION OF VOTE: Titanium (99~ Ti) MAGISON: This proposal is in accord with Proposal No. 18 as Titanium hydride (95% Ti, 3.8% H2) modified by the Panel. I believe that no significant confusion Uranium will result from elimination of Group F. Apparatus approved for Uranium hydride Group F only is almost certainly intended primarily for use in Vanadium (86.4% V) the presence of coal dusts which would be Group G under the Zirconium, prepared from hydride (contains 0.-3% 02) proposed definition. The disposition of apparatus presently Zirconium, hydride (93.6% Zr. 2.1% H) approved for Group F, but not for Group E, could be covered by a new paragraph in 500-2(a): Alloys and Compounds: "Equipment approved for Group F, but not Group E, in Aluminum-lithium alloy (15% Li) accordance with earlier editions of this Code, shall not be used Aluminum-manganese alloy (Do~m~etal) ' in Group E locations if the hazard is due to metallic dusts. Aluminum-silicon alloy (12% Si) . Such equipment may be used in Group E locations where the hazard Group F Atmospheres is due to carbonacious dusts." Carbonaceous" Dusts: Charcoal, hardwood mixture Gilsonite, Utah 500-2, FPN: Reject CMP 14 Pitch, coal tar SUBMITTER: Douglas R. Pratt, Dow Corning Corp. sphalt, blown petroleum resin 6 Revisefine print note as follows: ~itch, petroleum r~p G: Atmospheres containing flour, starch, grain, or, Coal, Kentucky (Bituminous) other dusts with similar characteristics. Coal, Pennsylvania, Pittsburg (Experimental Mine Coal) SUBSTANTIATION: Recently we have been involved in the Lignite, California. classification of production facilities in which combustible elemental silicon is present in a dust form. Dust particle size Group G Atmospheres ranges from 1 to 90 microns, with the bulk of samples at approximately 35 microns. Agricultural Dusts: Difficulty was encountered with the application of Section Almond shell 500-2, describing the various "Groups" of hazardous dust Apricot pit materials. In an effort to determine the particular "Group" Cellulose into which elemental silicon would fall, we turned to Cellulose, alpha definitions developed by the Instrument Society of America, Cellulose, flock, fine cut Standard S 12.10, dated 10/73, basing classifications upon Cherry pit conductivities of dusts in controlled conditions. Cinnamon It was discovered, as a result of tests performed by Hazards Citrus peel Research Corp., that combustible elemental silicone described Coca bean shell above, behaves similar to agricultural, plastic and other Cocoa, natural 19% fat "non-conductive" dusts, lying well within "Group G." Coconut shell We would also like to encourage the adoption of the ISA Coffee, full roasted Standard 12.10, or the development of a similar standard, to Corn assist institutions in correctly classifying their facilities by Corncob grit better defining the National Electrical Code's Class II Groups. Corn, dextrine pure PANEL RECOMMENDATION: Reject Cornstarch commercial product PANEL COMMENT: Reject in deference to Proposal No. 3. Cornstarch (thru No. 325 Sieve) VOTE ON PANEL RECOMMENDATION: Cork dust AFFIRMATIVE: 17. Cottonseed meal NEGATIVE: Adams. Cube root, South American EXPLANATION OF VOTE: Flax shive ADAMS: I think this proposal should be accepted, modified to Garlic, dehydrated read: "...or other dusts with similar hazardous Grain dust, winter wheat, corn, oats characteristics." Guar seed Gum, arabic Gum, karaya Gum, Manila (copal) 500-2 FPN: Accept CMP 14 Gum, tragacanth Secretary's No~e: It was the action of the Correlating Hemp hurd Committee that the Panel make editorial adjustment to make the Lycopodium fine print note a sentence. Malt barley i SUBMITTER: E. C. Magison, Honeywell Inc. Milk, skimmed 7 In the fourth paragraph after reference to Table Pea flour ~d: For groups E, F and G see Table 500-2(c). And add Peach pit shell now Table 500-2(c) to include the dusts.now listed in the Fire Peanut hull Protection Handbook, classified as indicated. Peat, sphagnum, sun dried SUBSTANTIATION: It is recommended that the various dusts listed Pecan nut shell in the National Fire Protection Association's Fire Protection Pectin (from ground dried apple pulp) Handbook, 14th Edition, pages 3-107 through 3-114 be included in Potato starch, dextrinated the National Electrical Code. The National Academy of Sciences Pyrethrum, ground flower leaves under contract by the Occupational Safety and Health Rauwolfia vomitoria root Administration has classified the dusts within the scope Groups Rice E, F, and G in the Code as well as by the data concerning dust Rice bran resistivity (another recommendation). Rice hull There is a need for a more definitive dust classification Safflower meal within the National Electrical Code. The prevalence of dusts in Soy flour industrial processes (i.e., plastic dust, wood dust, etc., which Soy protein are presently not classified) dictates a more precise Sucrose, chemically pure classification based on reliable scientific criteria and Sucrose information. This listing would facilitate easier referencing Sugar, powdered and better application of the National Electrical Code. It is Tung kernels, oil free therefore recommended that these dusts be included in the Walnut shell, black National Electrical Code as classified in the attached listing.* -Wheat, untreated *Attached listing supplied to CMP ~:mbers. Wheat flour I PANEL RECOMMENDATION: Accept as revised: Wheat gluten, gum ~th-e-f-ou-rt-h p-a~-agraph after reference to Table 500-2 add: Wheat starch, edible "For Groups E, F and G, see Table 500-2(a)." Add now Table Wheat starch, allyl chloride treated 500-2(a) as follows: Wheat straw 226 Wood, birch bark ground Acrylonitrile-vinyl chloride-vinylidene chloride Wood flour, white pine Acrylonitrile-vinyl chloride-vinylidene chloride copolymer Yeast, torula (70-20-I0) Chemicals: Group Ill, Cellulosic Resins Acetoacetanilide • Cellulose acetate Acetoacet-o-toluidine (2 methylacetoacetanilide) Cellulose triacetate Acetoacet-p~phenetidide Cellulose acetate butyrate Adipic acid Cellulose propionate, 0.3% free' hydroxyl Anthranilic acid Ethyl cellulose 5-10 micron dust Aryl nltroso methyl amide Methyl cellulose Azelaic acid Carboxy methyl cellulose, low viscosity, 0.3 to 0.4% a.a' Azoisobutyronitrile substitution, acid product Benzoic acid Hydroxyethyl cellulose-mono sodium phosphate sizing compound Benzotriazole Bis-phenol A I Group IV. Chlorinated Polyether Resins o-Chloroacetoacetanilide Chlorinated polyether alcohol )-Chloroacetoacetanilide Dehydroacetic acid Group VI. Nylon (Polyamide Resins) Diallyl phthalate Nylon (polyhexamethyleneadipamide) polyme~ Dicumyl peroxide suspended on CaCO3 (40-60) Dicyclopenladiene dioxide Group VII. PolycarbOnate Resins Dimethyl isophthalate !Polycarbonate o 3, 5 dinitrobenzoic acid Dinitrotoluamide (35 dinitro ortho toluamide) Group VIII. Polyethylene Resins Diphenyl Polyethylene, hl-pressure process Ditertiary butyl para cresol Polyethylene, low-pressure process Ethyl hydroxyethyl cellulose Polyethylene wax, low molecular weight Fumaric acid Hexamethylene tetramine Group X. Polypropylene Resins Hydroxethyl cellulose Polypropylene (contains no antioxidant) Isatoic anhydride DL-Methionine Group XI. Rayon Nitrosoamine Rayon (viscose) flock, 1.5 denier, 0.020 inch maroon Para oxy benzaldehyde Para phenylene diamine (milled)' Group XII. Styrene Polymer and Copolymer Resins Para tertiary butyl benzoic acid Polystyrene molding compound Pentaerythritol Polystyrene latex, spray-dried, contains surfactants Phenyl beta naphthylamine Styrene-acrylonitrile copolymer (70-30) Phthalic anhydride Styrene-butadiene latex copolymer, over 75% styrene, alum Phthalimide coagulated Salicylanilide Sorbic acid Group XIII. Vinyl Polymer and Copolymer Resins Stearic acid, aluminum salt (aluminum tristearate Polyvinyl acetate Stearic acid, zinc salt (zinc stearate) Polyvinyl acetate alcohol Sulfur Polyvinyl butyral Terephthalic acid Vinyl chloride-acrylonitrile cSpolymer, water emulsion ~ product (60-40) Drugs: Vinyl chloride-acrylonitrile copolymer, water emulsion product 2-Acetylamino-5-nitcothiazole, NHCOCH3 1 S-C=N-CH=C-NO2 (33-67) 2-Amino-S-nltrotheazole, NH2 S-C:N-CH:C-NOo Polyvinyl-chloride-dloctyl phthalate mixture (67-33) Aspirin (Acetylsalicyclic Acid o-CH3cooc6H~cooH Vinyl toluene-acrylonitrile-butadiene copolymer (58719-23) Gulosonic acid, diacetone C1~H1,rm~n Mannitol (hesahydric alcohol) CH~2 c~(C HOH )4CH2OH' Thermosetting Resins and Molding Compounds: Nitropyridone L-Sorbose (CIoH1104N3) Group I. Alkyd Resins Vitamin BI, menonitrate. ~12H170N4SN03 Alkyd molding compound, mineral filler, not self-extinguishing Vitamin C, ascorbic acla u6~806 Group II. Allyl Resins Dyes, Pigments and Intermediates: Allyl alcohol derivative CR-39, (from dust collector) I, 4-Diamino-2, 3-dihydroanthraquinone (90%) I methylamino-anthraquinone (10%) (Violet 200 dye) Group Ill. Amino Resins (Melamine and Urea) I, 4-Di'-p-toluidineanthra-quinone (70%), B Urea formaldehyde molding cempound, Grade II, fine naphthalene-azo-dimethyl-aniline (30%) (green base harmon dye) • Urea formaldehyde-phenol formal-dehyde molding 1-Methyla~inoanthraquinone (red dye intermediate) compound, wood flour filler B-naphthalene-azo-dimethylaniline Group VI. EpoxyResins Alloys and Compounds: Epoxy, no catalyst, modifier~or additives Calcium silicide Epoxy-bisphenol A mixture Ferromanganese~ medium carbon Ferrotitanium (19% Ti, 74.1% Fe, 0.~6%C) Group V. Furane Resins '. Phenol furfural Pesticides: Benzethonium Chloride Group VI. Phenolic Resins Bis (2-hydroxy-5~chlorophenyl) methane Phenol formaldehyde Dleldrin (~2H80~I~ 20% (50% Combustible 30% inert) Phenol formaldehyde, l-step 2,6 Di-terzlary-ou~#l-paracresom Phenol Tormaldehyde, 2-step Ferric dimethyldithiocarbamate (Ferbam). Phenol formaldehyde molding compound, wood flour filler Manganese vanicde ((CH31~ NC(~I~ ~M- Phenol formaldehyde, polyalkylene polyamine modified 1Naphthyl-N-methylcar6A~a~e'{"~e~)nW) 15% (85% inert) 3, 4, 5, 6 tetrahydro-3, 5-dimethyl-2H-1, 3, 5 thiadeazine Group VII. Polyester Resins 2 thione, ("Craig" No. 974) 5% (95% inert) Polyethylene terephthalate a, a' Trithiobis (N, N-dimethyl-thioformamide) Styrene modified polyester-glass fiber mixture (65-35) Thermoplastic Resins and Molding Compounds: Group VIII. Polyurethane Resins (Isocyanate) Polyurethane foam (toluene diiso-cyanate-polyhydroxy Group I. Acetal Resins with fluorocarbon blowing agent), not fire retardant Acetal, linear (Polyformaldehyde) Polyurethane foam (toluene diiso-cyanate-polyhydroxy with fluorocarbon blowing agent),'fire retardant Group.II. Acrylic Resins Methyl methacrylate polymer. Special Resins and Molding Compounds: Methyl methacrylate-ethyl acrylate copolymer Methyl methacrylate-ethyl acrylate-styrene copolymer Group I. Cold Molded Resins Methyl methacrylate-styrene-butadiene-acrylonitrile copolymer Petroleum resin (blown asphalt, regular) Methacrylic acid polymer, modified Acrylamide polymer Group If. Coumarone-lndeneResins Acrylonitr.ile polymer Coumarone-lndene, hard Acrylonitrile-vinyl pyridine copolymer

227 Group Ill. Natural Resins PANEL COMMENT: See Panel Comment on Proposal No. 7. Cashew oil phenolic, hard VOTE ON PANEL RECOMMENDATION: Lignin, hydrolized-wood-type, fines AFFIRMATIVE: 17. Rosin, DK NEGATIVE: Adams. Shellac COMMENT ON VOTE: Soldium resinate, dry size grade XXX MILLER: Although I am voting in the affirmative, I believe more clarification is needed on the handling of flammable Group VI. Rubber liquids versus combustible liquids as defined in NFPA 321. Rubber, crude, hard EXPLANATION OF VOTE: Rubber, synthetic,.hard, contains" 33% sulfur ADAMS: Although these 6 chemical compounds have been tested and fit very well into Table 500-2, I think that the additions Group V. Miscellaneous Resins will continue to the point of swamping the NEC with handbook Alkyl ketone dimer sizing compound, dimer dispersed on silica type material. (50-50) Chlorinated phenol (bis 2-hydroxy-5 chlorophenyl methane) Ethylene oxide polymer Ethylene-maleic anhydride copolymer Table 500-2: Accept CMP 14 Styrene-maleic anhydride copolymer SUBMITTER: E. C. Magison, Honeywell Inc. Petrin acrylate monomer, crude ]~TOI}~FA-L-~.'9 Add the following materials in the Groups l-6Bl-E~1-6d: Add a fine print note at the end of Table 500-2(a) as follows: Nonane - D "Atmospheres containing charcoal, coal or coke dusts which Cyclohexane - D have more than 8 percent total volatile material ,(ASTM D271) or Cyclohexene - D atmospheres containing these dusts sensitized by other materials Methylcyclohexane - D so that they present an explosion hazard:" Turpentine - D PANEL COMMENT: It is the Panel's view that it is inappropriate Butylene - D to expand the tables of classified materials in the'NEC. The 1-Pentene - D number of hazardous gases, vapors and dusts is so great that the Mexene - D classifications should be given in another NFPA publication. Heptene - D Such a publication would also benefit the user because it could Octene - D also explain the basis for the classification scheme. The Panel Nonene - D recommends strongly that documents such as Report NMAB 353-1, Tripropylene - D "Matrix of Combustion-Relevant Properties and Classification of Decene -D Gases, Vapors and Selected Solids," published by the National Dipentene.- D Research Council be used as a basis for a new NFPA publication Undecene - D or a revision of 325M. Tetrapropylene -D However, because the public at present views the NEC as the Tridecene - D source of material classifications, it is essential that the ,Tetradecene - O lists be included in the 1981NEC. Methylacetylene - C VOTE ON PANEL RECOMMENDATION: Ethyl Benzene - D AFFIRMATIVE: 15. Curnene - D NEGATIVE: Adams, Conaway, Ewers. Cymene - D r COMMENT ON VOTE: Tert-butyltoluene - O HALL: Fine print should follow Group F. Diethylbenzene - D MAGISON: I agree with proposal to list additional dusts, but Styrene - D " believe that the addition of the FPN after the table is a-Methylstyrene - D unnecessary because it duplicates information in the definitions Vinyltoluene - D of the Groups. Liquified petroleumgas - D MILLER: The fine print note which is part of the Panel Methyl acetylene - Propadiene (MAPP gas)-C Recommendation needs some editorial ~djustment to make it into a Naphtha, coal tar - D sentence. Naphtha, petroleum - D EXPLANATION OF VOTE: Stoddard solvent - D ADAMS: I believe that this proposal should be rejected. The O-Terphenyl - D extensive table of dusts is something that should be in a m-Terphenyl - D handbook and not in the NEC. I do not believe in putting p-Terphenyl - D material in the NEC temporarily. isopropyl alcohol - O CONAWAY: The table material was not available prior to-the Hexanol - D May'1979, meeting so material could not be studied prior to the Methyl amyl alcohol - D meeting. Ethyl butanol - D Great long lists of dust by catagory do not belong in the Methyl isobutyl carbinol - D Code. Where will the list stop. Proposed list just scratches Methyl cyclohexanol - D the surface of materials that could be listed. Diacetone alcohol - D By listing certain materials, do we infer that anything'not Propionaldehyde - C listed is nonhazardous. iso-butyraldehyde - C For certain resins and molding cempounds, there is a breakdown Valeraldehyde - C by Group I -- XII, etc. There is nd explanation of what these 3-methyl butyTaldehyde - C are. iso-pentyl aldehyde - C EWERS: Inclusion of all the materials listed is too 2-ethylhexaldehyde - C restrictive in many cases. It would unnecessarily classify many iso octyl aldehyde - C locations that are not a fire or explosion hazard. 2-ethyl-3 propyl-acrolein - C Glyoxal - C Glutaraldehyde - formic acid - D Table 500-2: Accept CMP 14 Propionic acid - D SUBMITTER: E. C. Magison, Honeywell Inc. Acrylic acid (inhibited) - D 8 Add the following materials in the groups Acetic anhydride - D ~d: Methyl formate - D Ethyl formate - D Arsine - B Methyl acetate - D Propyl Nitrate - B n-propyl acetate - D Ethyl Mercaptan - isopropyl acetate - D Ethyl Sulfide - C n-butylacetate - D Hydrogen Cyanide - C sec-butylacetate - O Ethylene Glycol Monomethyl Ether - D Tert-butylacetate - D" n-amylacetate - D SUBSTANTIATION: Under the auspices of the National Academy of isoamylacetate - D Sciences, the Underwriters Laboratories Inc. has investigated sec-amylecetate - D arsine, ethylene glycol monomethyl ether, ethyl mercaptan, sec-hexylacetate - D ethyly sulfide, hydrogen cyanide, and propyl nitrate for the methyl acrylate - D purposes of classifying them within the National Electrical I n-butyl acrylate (inhibited) - D Code's hazardous locations, Groups A, B, C and D. The results iso-butyl acrylate (inhibited) - D of the investigation are attached.* methyl methacrylate -D It is recommended, based on the Underwriters Laboratories o-dimethyl phthalate - 0 Inc.'s investigation and test results, that these 6 chemicals be Butyl benzyl phthalate-O included in the revision of the NEC in the Groups, as designated Methyl formal - C in the report. propyl formal - C *Attachments have been supplied to CMP. n-Butylformal - C PANEL RECOMMENDATION: Accept. iso-butyl formal - C

, 228 /J

• Phenyl ether - D p-Nitro aniline - D 2-hydroxyethyl acrylate- D Tetra-ethyl lead - C 1,4-dioxane (diethylene dioxide) - C Oimethyl sulfate -,D Glycidol - C Add the following to the list: Diglycidyl ether - C 2LPentanone - D Isopropyl glycidyl ether ~ C 2-Hexanone - D Furfural - C 2-Heptanone - D n-Ethyl morpholine - C Diisobutyl ketone - D Methyl chloride - D 3-Heptanone - D Methylene chloride - D Ethyl sec-amyl ketone - D Ethyl chloride - D Cyclohexanone - D 1,1-dichloroethane - D 0 methyl syclohetanone - D Methyl chloroform - D dichloroethyl ether - D 1,1,2 - Trichloroethane - D PANEL COMMENT: See Panel Comment on Proposal NoL 7. 1,2,3 Trichloropropane - D VOTE ON PANEL RECOMMENDATION: 1,2 - dichloroethylene - D AFFIRMATIVE: 16. Vinylidene chloride (inhibited) - D NEGATIVE: Adams, Conaway. trichloroethylene - D 'COMMENT ON VOTE: Allyl chloride - D SCHRAM: My notes show ansidine was also to be deleted. 1,3 - Dichloropropene - D EXPLANATION OF VOTE: Chloroprene - D ADAMS: These 136 chemical compounds should not be included in Ethylene chlorohydrin - D Table 500-2. The information belongs in the publication of The Methyl bromide - D National Academy of Science who developed the list. Ethyl bromide - D CONAWAY: See comments for Proposal No. 7. Where does'it all Chlorobenzene - D end. What about materials not proposed for Table that are p-dichlorobenzene - D hazardous. Methyl iodide - D Materials listed in Proposal No. g duplicate items already in 1,3, dichloro-5,5-dimethyl hydantoin - D existing Table. Methylamine - D Isopropylamine - D Butylamine - D Styrene Hexamethylamine diamine - D Naphtha Petroleum PetroleumNaphtha Diethylaminoethanol - D Isopropyl Alcohol 2 -- Propanol (isopropyl alcohol) Xylldine - D Anisidine - D The entire list needs further review. p-phenylene diamine - D The listing of stoddard solvent is questioned. Hydrazine - C If the list is added, some logical manner of listing should be Monomethylhydrazene - C used. Nitromethane - C Nitroethane - C 1 1-Nitropropane - C p-nitrochlorobenzene - O Table 500-2: Accept CMP 14 p- Nitro aniline - D SUBMITTER: P. J. Schram, Underwriters Laboratories Inc. Acetonitrile - D I~ 10 Delete "sec-butyl alcohol" from the second column. Tetramethyl succinonitrile - D ~IATION: Editorial correction. "Sec-butyl alcohol" is Methyl isocyanate -D same material as "2-butanol (secondary butyl alcohol)" in the Propylene imine - C second column, second line of Table 500-2. Apparently when Hexamethylenimine - C sec-butyl alcohol was added to Table 500-2 in 1978 Edition of Dimethyl Acetamide -D NEC as per Proposal No. 10, fact that 2-butanol (secondary butyl Dimethyl formamide - D alcohol) was already in Table 500-2 was overlooked. Tetra-ethyl lead - C PANEL RECOMMENDATION: Accept. Tetra-methyl lead - C VOTE" ON PANEL RECOMMENDATION: Unanimously Affirmative. Ethyl silicate - D Dibutylphosphate - D Triphenyl phosphate - D Dimethyl 1,2-dibromo-2-2-dichlorethyl phosphate (dibrom) - D 500-2(a): Reject CMP 14 Dimethyl sulfate - D SUBMITTER: Idaho Chapter IAEI allyl propyl disulfide -C i 11 Revise (a) as follows: SUBSTANTIATION: This recommendation moves the NEC toward a more ~ent shall be approved not only for the class of location comprehensive and usable standard regarding its application to but also for the "explosive, combustible, or ignitable" vapors and gases in hazardous locations. Under contracts with properties of the specific gas, vapor dust, "fiber or flyings"' the U.S Coast Guard (completed) add more recently, the ' that will be present. In addition, equipment shall not have Occupational Safety and Health Ac~ninistration (not completed), exposed any surface that operates at a temperature in excess of the National Academy of Sciences (NAS) has sought a more the ignition temperature of the specific gas, vapor, dust, ' inclusive classification of gases and vapors, as defined in the "fiber, or flyings." National Electrical Code as Groups A, B, C, and D in hazardous SUBSTANTIATION: Class Ill locations have an approval for class locations. properties as well as Class I and Class II locations. The The present NEC groupings do not include the many gases and properties (fiber and flyings) of ignitables in Class Ill vapors present in industry today that are capable of locations have been left out of the wording in this section and classification through appropriate procedures. The NAS has should not be excluded. The addition of the words "explosive, undertaken the objective of classification, and although the combustible, or ignitable" is the wording used in Section 500-4, document is still undergoing some review, these recommendations 500-5 and 500-6 to describe the properties in Class I, Class II, are proper for inclusion in the NEC. and Class Ill locations. It is recommended, therefore, that all the gases and vapors PANEL RECOMMENDATION: Reject. indicated above, which are contained in the attached* published PANEL COMMENT: Already covered by Proposal No. 4. matrix, as well as the draft matrix, noted in the "NAS VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Classification" column as either A,.B, C, D, or A, B, C, D, be added to the list of "gases and vapors in the pr~en~ N~C.- The remaining gases and vapors marked with an asterisk (*), brackets ( ),. a dagger (t), or a double letter (X(X), are not 500-2ia) ,and (b): Accept CMP 14 recommended for the inclusion at this time. SUBMITTER: G. A. Karstens, AmeriCan Feed Manufacturers *Attachments have been supplied to CMP. ~on, F. Lind~olm, Association of Operative Millers, J. PANEL RECOMMENDATION: Accept as Revised: • Healy, Grain Elevator and Processing Society Delete the following from the list: PROPOSAL: 12 Revise (a) as follows: Tridecene - D "--Ta~--~pproval for Class and Properties. In Class I locations Tetradecene - D equipment shall be approved not only for the location but also Styrene - D for the explosion properties of the specific gas or vapor. In - Naphtha, petroleum - D Class II or Ill, Division 1 locations equipment shall be O-Terphenyl - D approved for .the dust-ignition-proof properties of the m-Terphenyl - D COmbustible oust or easily ignitible fibers or flying fines that p-Terphenyl - D will be present. Methyl cyclohexanol Revise (b) as follows: 2-ethyl 3 propyl-acrolein - C (b) Marking. In Class I locations approved equipment shall n-butylacetate be marked to show the Class, Group and operating temperature, or o-dimethyl phthalate - D temperature range, based on operation in a 40°C ambient. In xylidine - D Class II and Ill, Division 1 l~cations approved equipment shall p-phenylene diamine - D be marked to show the Cl#ss, Group and operating temperature, or p-nitrochlorobenzene - D temperature range based on operation in a 40°C ambient. 229 SUBSTANTIATION: It is the understanding of our organizations 500-2(c) and 502-I: Reject CMP 14 that~we do not need labeled equipment in Class I] and Class Ill SUBMITTER: E. C. Magison, Honeywell Inc.- Division 2 locations. As a result we are recommending this 15 In the first paragraph of 500-2(c) add: wording to avoid any possible confusion regarding the type of ~sts the temperature marking shall be at least 25°C lower equipment to be used in Division 1 or ~ locations. than the layer ignitiontemperature at the dust to be PANEL RECOMMENDATION: , Accept as revised: encountered. The ignition temperature for which equipment was Disregard proposed changes to Section 500-2(a) and revise formerly approved is given in the Table below: (use Table proposed changes to Section 500-2(b) as follows: No change in 502-1). In the fourth paragraph of 502-1 delete Table 502-1 and Paragraph I and revise Exception No. 3 to read: reference to it. Exception No. 3: Fixed general purpose equipment in Class I SUBSTANTIATION: The inclusion of plastics dusts and other dusts locations other than fixed lighting fixtures which is acceptable in Group G requires that more flexiblility of selection of for use in Class I Division 2 locations .... equipment surface temperatures for Class II equipment be Add an Exception No. 4 as follows: available. Exception No~ 4: Fixed dust tight equipment other than fixed If a dust has a low melting point, a low layer ignition lighting fixtures which are acceptable for use in Class II temperature, or exhibits a change in form, such as foaming, the Division 2 and Class Ill locations shall not be required to be equipment surface temperature must be appropriately limited. marked with the Class, Group, Division or operating temperature. This temperature may be lower than those now recognized to be PANEL COMMENT: The Panel agrees that some equipment for use in safe for flours, grain dusts, etc. Class II Division 2 and Class Ill locations need not be PANEL RECOMMENDATION: Reject. specifically marked. PANEL COMMENT: Already covered by Section 500-2(a). VOTE ON PANEL RECOMMENDATION: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. AFFIRMATIVE: 17. NEGATIVE: Miller. COMMENT ON VOTE: EWERS: In Section (b) I believe the wording "based on 500-4(a)(I): Accept CMP 14 operation in a 40°C ambient" (2 places) should be changed to SUBMITTER: CI~~ 14 "referenced to a 40°C ambient." Thi~ will agree with the Panel 15A Revise 500-4ia)(1) to read: Recommendation in Proposal No. 13. ~n which hazardous concentrations of flammable gases or EXPLANATION OF VOTE: vapors exist under normal operating conditions; or". MILLER: I am of the opinion that the exceptions should'be SUBSTANTIATION: Panel is of opinion that woFding of 500-4(a)(I) worded to indicate that they do not apply to listed equipment. and 500-5(a)(1) should be of a similar nature. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: 500-2(b): Accept , CMP 14 ADAMS: My notes indicate "hazardous" should be changed to SUBMITTER: R. Y. Newton, General Electric Co. "ignitable." 13 Revise first paragraph as follows: EWERS: The word "hazardous" should be changed to "ignitable" ~ed equipment shall be marked to show the Class, Group, to agree with Proposal No. 1. and operating temperature or temperature range, based on SCHRAM: To be consistent with the Panel Recemmendation on operation in a specified ambient temperature range, for which it Proposal No. 1, the word "hazardous" preceding "concentrations" is approved. should be changed to "ignitable." SUBSTANTIATION: The present statement regarding ambient temperature for equipment operation in Hazardous Locations first appeared inthe 1971 Code when equipment marking of approved Q temperature ranges by identification numbers per Jable 500-2b 500-5(a)(i): Accept CMP 14 was adopted. It appears to+say that the equipment is approved SUBMITTER: G. A. Karstens, American Feed Manufacturers only if operating in a 40°C ambient temperature and neither ~-s-~--Tai-~on, F. Lindholm, Association of Operating Millers, J. higher nor lower temperatures. This was the interpretation on Healy, Grain Elevator and Processing Society occasion by Underwriters Laboratories. PROPOSAL: 16 Revise(1) as follows: UL adopted as standard in 1975 that Class I Gp. D & Class II II, Division 1 location is a location: (1) in which Gp. E. F. and G motors approved for 40ec ambient hazardous combustible dust is in the air under normal operating locations were suitable for operation in an ambient tamperature conditions .... " range of-25°C to 40°C. P. J. Schram of UL, who is presently on SUBSTANTIATION: The wording in this particular paragraph has Code Panel 14, is familiar with this. led to some confusion between the intent of 500-5(a) and "Operation in a 40°C ambient" can only be an academic 500-5(b). It is felt that by changing this wording there will statement and not a realistic statement. In my opinion there is be less misunderstanding as to the definition of Class.I], a need on the part of specifiers, equipment manufacturers, Division I and Class If, Division 2 locations. users, and regulating authorities for a clear statement that PANEL RECOMMENDATION: Accept. equipment for hazardous locations is approved based on a VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specifi'ed ambient temperature range. COGENT ON VOTE: PANEL RECOMMENDATION: Accept as Revised: HALL: It is noted that a semicolon appears between condition "Approved equipment shall be marked to show the Class, Group, (1) and condition (2). This was considered an editorial change and operating temperature, or temperature range referenced to a when P~nel 14 made editorial changes on the 1975 Code. Since it 40°C ambient." is a substantive change, I believe the comma should replace the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. semicolon.

500-2(b): Reject CMP 14 500-5(a), FPN: Reject . CMP 14 SUBMITTER: Joseph L. Yosafat, General Electric Co. SUBMITTER: Douglas R. Pratt, Dow Corning C6rp. ]~rOl~'~B~--~." 14 + Revise first paragraph as follows: I~TO-P-O-~FAt-~." 17 Add the words "and inorganic" following the word- Approved equipment shall be marked to show the Class, Group, "orgY" in the second paragraph. maximum temperature and the maximum ambient temperature for SUBSTANTIATION: Recently we have been involved in the which it is approved. classlficatlon of production facilities in which combustible SUBSTANTIATION: The present statement regarding ambient elemental.silicon is present in a dust form. Dust particle size temperature for equipment operation in Hazardous Locations first ranges from 1 to 90 microns, with the bulk of samples at appeared in the 1971 Code when equipment marking of approved approximateJy 35 microns. temperature ranges by identification numbers per Table 500c2b Difficulty was encountered with the application of Section was adopted., It appears to say that the equipment is approved 500-2, describing the various "Groups" of hazardous dust only if operating in a 4O°C ambient temperature and neither materials. In an effort to determine the particular "Group" higher nor lower temperatures. This was the interpretation on into which elemental silicon would fall, we turned to occasion by Underwriters Laboratories. + definitions developed by the Instrument Society of America, A nationally recognized testing laboratory adopted as standard Standard S 12.~0, dated 10/73, basing classifications upon in 1975 that Class I Gp. D & Class II Gp. E, F, and G motors conductivities of dusts in controlled conditions. approved for 40°C ~bient hazardous locations were suitable for It was discovered, as a result of tests performed by Hazards operation in an ambient temperature range of -25°C to +40°C. Research Corp., that combustible elemental silicone described P.J. Schram, who is presently on Code Panel 14, is familiar wit~ above, behaves similar to agricultural, plastic and other this. "non-conductive" dusts, lying well within "Group G." "Operation in a 40°C ambient" can only be an academic We would also like to encourage the adoption of the ISA statement and not a realistic statement. There is a need on the Standard 12.10, "or the development of a'similar standard, to part of specifiers, equipment manufacturers, users, and assist institutions in correctly classifying their facilities by regulating authorities for a clear statement of suitable ambient better defining the National Electrical Code's Class I] Groups. temperatures for electrical equipment in hazardous locations. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 3. PANEL COMMENT: See Committee action on Proposal No. 13. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

230 500-5(a) and (b): Accept CMP 14 fibers and flyings in sawmills are not mentioned in the second SUBMITTER: G. A. Karstens, American Feed Manufacturers fine print note paragraph in Section 500-6(a). It is obvious ~on, F. Lindholm, Association of Operating Millers, J. that many types of fibers and flyings are not mentioned, but one Healy, Grain Elevator and Processing Society as prevalent in many areas as sawdust and woodchips should be PROPOSAL: 18 Deletethe fine print notes in both of these mentioned there. paragraphs. Change woodworking plants to woodworking locations because SUBSTANTIATION: The wording as is in the ~ine print notes was woodworking locations other than woodworking plants present the prepared some 25 years ago. There has been little or no change same hazards as do the woodworking plants. in this wording. Since that particular time, there has been a PANEL RECOMMENDATION: Accept. great deal of change in the industry's operation, and the VOTE ON PANEL RECOMMENDATION: wording as is can be misleading. AFFIRMATIVE: 15. PANEL RECOMMENDATION: Acceptas Revised: NEGATIVE: Adams, Conaway, Ewers. I Delete the FPN in Section 500-5(b). Delete first paragraph of EXPLANATION OF VOTE: FPN in Section 500-5(a). Retain the second paragraph and change ADAMS: I think the addition of sawmills and "sawdust and next to last sentence to read: "Electrically conductive dusts woodchips is too far-reaching. are dusts with a resistivity less than 105 ohm-cm." CONAWAY: I am voting negatively on this Proposal since I feel VOTE ON PANEL RECO~ENDATION: further revision is needed. The present section lists clothing AFFIRMATIVE: 15. manufacturing p!ants. Clothing plants such as shirt factories, NEGATIVE: Conaway, Short. dress factories, suit manufacturers, etc., do not have hazards NOT VOTING: Adams. needing Class Ill, Division I installations. Basic textile EXPLANATION OF VOTE: manufacturing facilities are and should be covered but clothing ADAMS: I am not voting on this Proposal because the proposed manufacturing plants should not be. revision would remove Class II Division 1 locations. I would EWERS: I believe it is too restrictive to include all small favor the original proposal more. woodworking operations in Class Ill, Division I. CONAWAY: I am voting negatively on this proposal. I could accept the elimination of the first paragraph of the FPN for 500-5(a) if the second paragraph was retained. I could also accept the elimination of the FPN following 500-6(a) FPN: Reject CMP 14 250-5(b) if it was not tied to 250-5(a). SUBMITTER: IdahoChapter IAEI SHORT: There Is no justification to accept 105 ohm PROPOSAL: 21 In the first paragraph of the fine print note, centimenters as the cutoff point for conductive dusts. This delete tne words "woodworking plants" and replace with the words proposal would in effect divide Group F into two groups. "sawmills and other woodworking locations." In the second paragraph, add the words "sawdust, woodchips" after the word "excelsior." SUBSTANTIATION: The additional wording is needed to stress the 500-5(b): Accept CMP 14 fire hazards existing in sawmill locations from fibers and SUBMITTER: G. A. Karstens, American Feed Manufacturers flyings. Fibers and flyings from green timber will dehydrate ~on, F. Lindholm, Association of Operative Millers, J. and carbonize in a short period of time, and, being an organic Healy, Grain Elevator and Processing Society material, is highly susceptible to spontaneous ignition. The PROPOSAL: 19 Revise as follows: wording "woodworking plants" does.not give an indication that ~s II, Division 2 location is a location in which sawmills should be included in this class./In the industry, combustible dust will not normally be in suspension in the air woodworking plants are generally considered to be those or will not be likely to be thrown into suspension by the normal locations where wood products are finished.after the original operation of equipment or apparatus in quantities sufficient to milling of the raw timber. Sawdust and woodchips that are produce explosive or ignitable mixtures, but (I) where spillage fibers and flyings in sawmills are not mentioned in the second. that may occur will be readily removed and where the fine print note paragraph in Section 500-6(a). It is obvious accumulation of dusts will not be sufficient to interfere with that many types of fibers and flyings are not mentioned, but one the normal operation of electrical equipment or apparatus; or as prevalent in many areas as sawdust and woodchips should be (2)" where such deposits or accumulations of combustible dust on, mentioned there. in or in the vicinity of electric equipment might be ignited by Change woodworking plants to woodworking locations because arcs, sparks or burning material from the failure or abnormal woodworking locations other than woodworking plants present the operation of suchequipment. same hazards as do the woodworking plants. SUBSTANTIATION: The wording as changed better describes the PANEL RECOMMENDATION: Reject. condition that exists in present Class If, Division 2 locations. PANEL COMMENT: See Panel action on Proposal No. 20, Section PANEL RECOMMENDATION: Accept as Revised: 500-6(a).FPN. I Revise 1978 NEC by adding Mter "equipment or apparatus" in VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 500-5(b)(1) "under normal operating conditions; or." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. CO~ENT ON VOTE: SHORT: Although it is recognized that the wording here is a 500-7-(NOW): Reject , CMP 14 marked improvement over that presently in the 1978 NEC, further SUBMITTER: R. S. Pinkerton, Los Angeles, CA' improvement will be achieved by the following revised wording: L~R-O]~O~-A-C-~.• 22 Add ~ now section as follows: A Class II, Division 2 Location is a location in which: -~-O~[17-[--.Wiring and Equipment Above Hazardous Locations. (I) Combustible dust will not normally be in suspension in (a) All fixed wiring installed in the open space above the air in quantities sufficient to produce explosive or hazardous locations shall be in metallic raceways, Type MI cable ignitable mixtures, and dust accumulations are normally or ALS cable. Cellular metal floor raceway may be used only for insufficient to interfere with the normal operation of supplying ceiling' outlets or extensions to the area below the electrical equipment or other apparatus. floor, but such raceway shall have no connections leading into (2) Dust may be in suspension in the air as a result of or through any hazardous locations above the floor. infrequent malfunctioning of handling or processing equipment, (b) Equipment which may produce arcs, sparks or particles of and dust accumulations resulting therefrom may be ignitable by hot metal, such as lamps, lampholders for fixed lighting, abnormal operation or failure of electrical equipment or other cutouts, switches, receptacles, charging panels, generators, apparatus. motors or other rotating equipment having make-or-break or sliding contacts shall be of the totally enclosed type or shall , be provided with suitable guards or screens to prevent the escape of sparks or hot metal particles. 500-6(a) FPN: Accept CMP 14 SUBSTANTIATION: This proposal is intended to correct an SUBMITTER: IdahoChapter IAEI omission in the Code which does not generally recognize and 20 In Section 500-6(a) fine print note, in the third provide for the hazard of dropping molten metal or hot metal ]Tne--o~-the first paragraph after "clothing manufacturing particle into hazardous vapors when overhead electrical wiring plants," add the words "sawmills and other woodworking or equipment above" and out of the hazardous location, develops a locations." The third line would then read: "mills; flax fault. This requirement is found in certain specific locations processing plants; clothing manufacturing plants; sawmills and but.it should be stated in Article 500 for all hazardous other woodworking locations." locations as the danger is the same. In the second paragraph in the last line after the word PANEL RECOMMENDATION: Reject. "excelsior," add the words "sawdust, woodchips,".' The last line PANEL COMMENT: Supporting comment is not persuasive as to wo~Id then read: "baled waste kapok, Spanish moss, excelsior, necessity. sawdust, woodchips, and other materials of similar nature." VOTE ON PANEL RECOMMENDATION: SUBSTANTIATION: The additional wording is needed to stress the AFFIRMATIVE: 17. fire hazards existing in sawmill locations from fibers and NEGATIVE: Boylston. flyings. Fibers and flyings from green timber will dehydrate EXPLANATION OF VOTE: and carbonize in a short period of time, and, being an organic BOYLSTON: Requirements for wiring above all classified material, is highly susceptable to spontaneous ignition. The locations is not well understood by those using the NEC. These wording "woodworking plants" does not give an indication that requirements should be covered in Article 500 to provide the sawmills should be included in this class. In the industry, needed emphasis. woodworking plants are generally considered to be those locations where wood products are finished after the original milling of the raw timber. Sawdust and woodchips that are 231 500-7-(New): Reject CMP 14 501-4(b), Exception No. 2-(New): Reject CMP i% SUBMITTER: Southwestern Section IAEI SUBMITTER: James M. Daly, The Okonite Co. PROPOSAL: 23 500-7. Wiring and Equipment Above Hazardous PROPOSAL: 28 Delete last paragraph of 501-4(b). Replace with a new exception as follows: (a) All fixed wiring installed in the open space above Exception No. 2: Where installed in cable tray, Type MV hazardous locations shall be in metallic raceways, t~pe MI cable single conductors and multiconductor cables rated 2001 Volts and or ALS cable. Cellular metal floor raceway may be used only for over shall have metallic shielding on each conductor. supplying ceiling outlets or extensions to the area below the Multiconductor Type MC cable with a continuous metallic sheath floor, but such raceway shall have no connections leading into shall be permitted to have nonshielded conductors. or through any hazardous locations above the floor. SUBSTANTIATION: The existing text requires the use of shielded (b) Equipment which may produce arcs, sparks or particles conductors, both single and multiconductor, 'in cable trays for of hot metal, such as lamps, l ampholders for fixed lighting, over 600 Volts. The intent is correct, namely to provide a cutouts, switches, receptacles, charging panels, generators, ground path for fault currents without an external arc. motors or other rotating equipment having make-or-break or Non-shielded single conductors and multiconductor cables would sliding contacts, shall be of the totally enclosed type or shall arc to the tray and should be shielded, however, multiconductor be provided wSth suitable guards or screens to prevent the cables enclosed in a smooth metallic sheath or a welded and escape of sparks or hot metal particles. corrugated metallic sheath as defined for Type MC cable in SUBSTANTIATION: This proposal is intended to correct an Section 334-22 would have the sheath as a shield to safely emission in the Code which does not generally recognize and conduct fault currents and contain any arc within the cable. provide for the hazard of dropping molten metal or hot metal The two sheaths specified provide a grounding path in excess of particle into hazardous vapors when overhead electrical wiring Table 250-95. or equipment above and out of the hazardous location, develops a PANEL RECOMMENDATION: Reject. fault. This requirement is found in certain specific locations PANEL COMMENT: Already covered by first paragraph of s.ame but it should be stated in Article 500 for all hazardous Section. locations as the danger is the same. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Supporting co~ent is not persuasive as to necessity. VOTE ON PANEL RECOMMENDATION: 501-5(a)(1), Exception-(New): Accept CMP 14 AFFIRMATIVE: 17. SUBMITTER: P. J. Schram, Underwriters Laboratories Inc. r NEGATIVE: Boylston. ]~TO]~'A-L-~." 29 Add a new exception as follows: COMMENT ON VOTE: --l~-xc-epl~ion: Conduit runs entering an explosion-proof enclosure JORIMAN: The submitter of this proposal was to supply for switches, circuit breakers, fuses, relays, or other additional information to support the Code change. As none was apparatus which may produce arcs or sparks need not be sealed if received the IAEI Code Panel member had no choice but to concur the current interrupting contacts are: with the rest of the Panel and reject Proposal No. 23. a. Enclosed within a chamber hermetically sealed against the EXPLANATION OF VOTE: entrance of gases or vapors; or, BOYLSTON: See Comment-on Proposal No. 22. b. Immersed in oil in accordance with Section 501-6(b)(1) and (2). SUBSTANTIATION: We believe it is the intent of the first sentence of Section 501-5(a)(1) and Section 501-5(a)(2) to ARTICLE 501 -- CLASS I LOCATIONS require seals in conduit runs 1 1/2-inch trade size and smaller only when the conduit runs enter 501-3(a): Accept CMP 14 enclosures containing a source of ignition under normal SUBMITTER: D. H. Mclntosh, E. I. du Pont de Nemours & Co. operating conditions. The Code does not require seals on 24 Revise first sentence of second paragraph as conduit runs 1 1/2-inch trade size and smaller entering explosion-proof junction boxes if the boxes contain only wiring Enclosures approved for Class I, Division, 1 locations and splices. If the interruption of current occurs within an include: (a) explosion-proof enclosures, and (b) purged and hermetically sealed chamber or the contacts are properly oil pressurized enclosures. immersed, there is no ignition s~urce under normal operating SUBSTANTIATION: To clarify intent. conditions, and the construction is essentiallx the same as an PANEL RECOMMENDATION: Accept. explosion-proof outlet box containing only wiring and splices. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Conductors which may be flexed as a condition of normal operation, such as mercury-tube switch leads, could eventually fail and result in arcing, but we do not believe it was the original intent of the Code to consider such leads as "apparatus 501-3(b)(6)(2): Accept CMP 14 which may produce arcs, sparks, or high temperatures." For SUBMITTER: TSC-Nominal Voltage example, the Code does not appear to require !eads in I~ 25 Add "nominal" after "120 volts." explosion-proof flexible connection fittings which may be flexed SUBSTANTIATION: To conform to the guidelines established by the under normal conditions to be sealed. TSC on Nominal Voltages. We believe that Section 501-B(a)(1) of the Code should be PANEL RECOMMENDATION: Accept. clarified so that specifiers, installers, and inspectors will PANEL COMMENT: CMP 14 recommends that by changing Section 110-4 have a clear indication as to whether or not seals are required to read "Throughout this Code the voltage considered shall be in' conduit runs entering explosion-proof enclosures housing the nominal system voltages at which the circuit operates" would mercury-tube switches, and in similar situations, and so that eliminate the need to add nominal each time voltage is used. testing laboratories such as Underwriters Laboratories Inc. will VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be able to publish more detailed test requirements for such products based on the intended method of installation. If it is the intent of the Code that seals be required in such circumstances (the above proposal is based on seals not being SOI-4(a) and (b): Reject CMP 14 required), the Code should be revised to so indicate. SUBMITTER: John J. Brett,'Berger Industries, E.T.P. Div. PANEL RECOMMENDATION: Accept as Revised: PR]~P-O-~A-L-~.• 26 Revise (a) and (b) as follows: Between the words "runs" and "entering" add the words "1 I/2 ~ss I Division I locations, threaded rigid metal conduit, inches and smaller". threaded steel intermediate metal conduit with integral or VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. associated couplings or type MI cable with termination fittings approved for the location shall be the wiring method employed. SUBSTANTIATION: We have tested our product ourselves and find it conforms to the requirements laid down by U.L. We have 501-5(a)(S)-(New): ReJect ' CHP 14 requested U.L. to set up a fact finding investigation and SUBMITTER: Robert G. MacManus, Pawtucket, RI testing for our product. 30 Add a new (5) as follows: PANEL RECOMMENDATION: Reject. T~TT-Nember of Conductors Allowed In One Sea]. The number of PANEL COMMENT: No evidence to support the suggested change. conductors allowed in any one seal shall be limited to nine. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: No restriction has ever been placed on the number of conductors in a raceway which is required to be sealed. It would be next to impossible to make an effective seal with the installation of a large number of conductors. As 501-4(b): Accept CMP 14 an example, 154 No. 14 conductors may be installed in a 2 inch SUBMITTER: TSC-Nominal Voltage conduit. The writer has seen 83 conductors in a combination of ~ 27 I~ the last paragraph add "nominal" after "600 No. 14 - No. 12 and No. 10 wires. A seal was attempted in order I to comply w~th Section 501-5(a)(2). SUBSTANTIATION: To conform to the guidelines established by the PANEL RECOMMENDATION: Reject. TSC on Nominal Voltages. PANEL COMMENT: Proposal is too restrictive. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: See Panel Comment on Proposal 25. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

232 500-7-(New): Reject CMP 14 501-4(b), Exception No. 2-(New): Reject CMP i% SUBMITTER: Southwestern Section IAEI SUBMITTER: James M. Daly, The Okonite Co. PROPOSAL: 23 500-7. Wiring and Equipment Above Hazardous PROPOSAL: 28 Delete last paragraph of 501-4(b). Replace with a new exception as follows: (a) All fixed wiring installed in the open space above Exception No. 2: Where installed in cable tray, Type MV hazardous locations shall be in metallic raceways, t~pe MI cable single conductors and multiconductor cables rated 2001 Volts and or ALS cable. Cellular metal floor raceway may be used only for over shall have metallic shielding on each conductor. supplying ceiling outlets or extensions to the area below the Multiconductor Type MC cable with a continuous metallic sheath floor, but such raceway shall have no connections leading into shall be permitted to have nonshielded conductors. or through any hazardous locations above the floor. SUBSTANTIATION: The existing text requires the use of shielded (b) Equipment which may produce arcs, sparks or particles conductors, both single and multiconductor, 'in cable trays for of hot metal, such as lamps, l ampholders for fixed lighting, over 600 Volts. The intent is correct, namely to provide a cutouts, switches, receptacles, charging panels, generators, ground path for fault currents without an external arc. motors or other rotating equipment having make-or-break or Non-shielded single conductors and multiconductor cables would sliding contacts, shall be of the totally enclosed type or shall arc to the tray and should be shielded, however, multiconductor be provided wSth suitable guards or screens to prevent the cables enclosed in a smooth metallic sheath or a welded and escape of sparks or hot metal particles. corrugated metallic sheath as defined for Type MC cable in SUBSTANTIATION: This proposal is intended to correct an Section 334-22 would have the sheath as a shield to safely emission in the Code which does not generally recognize and conduct fault currents and contain any arc within the cable. provide for the hazard of dropping molten metal or hot metal The two sheaths specified provide a grounding path in excess of particle into hazardous vapors when overhead electrical wiring Table 250-95. or equipment above and out of the hazardous location, develops a PANEL RECOMMENDATION: Reject. fault. This requirement is found in certain specific locations PANEL COMMENT: Already covered by first paragraph of s.ame but it should be stated in Article 500 for all hazardous Section. locations as the danger is the same. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: Supporting co~ent is not persuasive as to necessity. VOTE ON PANEL RECOMMENDATION: 501-5(a)(1), Exception-(New): Accept CMP 14 AFFIRMATIVE: 17. SUBMITTER: P. J. Schram, Underwriters Laboratories Inc. r NEGATIVE: Boylston. ]~TO]~'A-L-~." 29 Add a new exception as follows: COMMENT ON VOTE: --l~-xc-epl~ion: Conduit runs entering an explosion-proof enclosure JORIMAN: The submitter of this proposal was to supply for switches, circuit breakers, fuses, relays, or other additional information to support the Code change. As none was apparatus which may produce arcs or sparks need not be sealed if received the IAEI Code Panel member had no choice but to concur the current interrupting contacts are: with the rest of the Panel and reject Proposal No. 23. a. Enclosed within a chamber hermetically sealed against the EXPLANATION OF VOTE: entrance of gases or vapors; or, BOYLSTON: See Comment-on Proposal No. 22. b. Immersed in oil in accordance with Section 501-6(b)(1) and (2). SUBSTANTIATION: We believe it is the intent of the first sentence of Section 501-5(a)(1) and Section 501-5(a)(2) to ARTICLE 501 -- CLASS I LOCATIONS require seals in conduit runs 1 1/2-inch trade size and smaller only when the conduit runs enter 501-3(a): Accept CMP 14 enclosures containing a source of ignition under normal SUBMITTER: D. H. Mclntosh, E. I. du Pont de Nemours & Co. operating conditions. The Code does not require seals on 24 Revise first sentence of second paragraph as conduit runs 1 1/2-inch trade size and smaller entering explosion-proof junction boxes if the boxes contain only wiring Enclosures approved for Class I, Division, 1 locations and splices. If the interruption of current occurs within an include: (a) explosion-proof enclosures, and (b) purged and hermetically sealed chamber or the contacts are properly oil pressurized enclosures. immersed, there is no ignition s~urce under normal operating SUBSTANTIATION: To clarify intent. conditions, and the construction is essentiallx the same as an PANEL RECOMMENDATION: Accept. explosion-proof outlet box containing only wiring and splices. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Conductors which may be flexed as a condition of normal operation, such as mercury-tube switch leads, could eventually fail and result in arcing, but we do not believe it was the original intent of the Code to consider such leads as "apparatus 501-3(b)(6)(2): Accept CMP 14 which may produce arcs, sparks, or high temperatures." For SUBMITTER: TSC-Nominal Voltage example, the Code does not appear to require !eads in I~ 25 Add "nominal" after "120 volts." explosion-proof flexible connection fittings which may be flexed SUBSTANTIATION: To conform to the guidelines established by the under normal conditions to be sealed. TSC on Nominal Voltages. We believe that Section 501-B(a)(1) of the Code should be PANEL RECOMMENDATION: Accept. clarified so that specifiers, installers, and inspectors will PANEL COMMENT: CMP 14 recommends that by changing Section 110-4 have a clear indication as to whether or not seals are required to read "Throughout this Code the voltage considered shall be in' conduit runs entering explosion-proof enclosures housing the nominal system voltages at which the circuit operates" would mercury-tube switches, and in similar situations, and so that eliminate the need to add nominal each time voltage is used. testing laboratories such as Underwriters Laboratories Inc. will VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. be able to publish more detailed test requirements for such products based on the intended method of installation. If it is the intent of the Code that seals be required in such circumstances (the above proposal is based on seals not being SOI-4(a) and (b): Reject CMP 14 required), the Code should be revised to so indicate. SUBMITTER: John J. Brett,'Berger Industries, E.T.P. Div. PANEL RECOMMENDATION: Accept as Revised: PR]~P-O-~A-L-~.• 26 Revise (a) and (b) as follows: Between the words "runs" and "entering" add the words "1 I/2 ~ss I Division I locations, threaded rigid metal conduit, inches and smaller". threaded steel intermediate metal conduit with integral or VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. associated couplings or type MI cable with termination fittings approved for the location shall be the wiring method employed. SUBSTANTIATION: We have tested our product ourselves and find it conforms to the requirements laid down by U.L. We have 501-5(a)(S)-(New): ReJect ' CHP 14 requested U.L. to set up a fact finding investigation and SUBMITTER: Robert G. MacManus, Pawtucket, RI testing for our product. 30 Add a new (5) as follows: PANEL RECOMMENDATION: Reject. T~TT-Nember of Conductors Allowed In One Sea]. The number of PANEL COMMENT: No evidence to support the suggested change. conductors allowed in any one seal shall be limited to nine. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: No restriction has ever been placed on the number of conductors in a raceway which is required to be sealed. It would be next to impossible to make an effective seal with the installation of a large number of conductors. As 501-4(b): Accept CMP 14 an example, 154 No. 14 conductors may be installed in a 2 inch SUBMITTER: TSC-Nominal Voltage conduit. The writer has seen 83 conductors in a combination of ~ 27 I~ the last paragraph add "nominal" after "600 No. 14 - No. 12 and No. 10 wires. A seal was attempted in order I to comply w~th Section 501-5(a)(2). SUBSTANTIATION: To conform to the guidelines established by the PANEL RECOMMENDATION: Reject. TSC on Nominal Voltages. PANEL COMMENT: Proposal is too restrictive. PANEL RECOMMENDATION: Accept. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL COMMENT: See Panel Comment on Proposal 25. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

232 501-5(c)(2): Accept CMP 14 501-6(b): Accept CMP 14 SUBMITTER: TSC-Approved for the Purpose SUBMITTER: W.A. Short, Crouse-Hinds Company 31 See the Technical Subcommittee "Reco~ndations" P~. 34 Add a new 501-6(b)(5): un-u'n-~--r'-i~e definition of "Approved for the Purpose" in Article ---(TT-~uses Internal to Lighting Fixtures. Listed cartridge 100. fuses shall be permitted within lighting fixtures. SUBSTANTIATION: See the TSC "findings" under the definition of SUBSTANTIATION: The principal reason for internal fusing of "Approved for the Purpose" in Article 100. lighting fixtures is to remove the faulty fixture from the PANEL RECOMMENDATION: Accept as Revised: circuit before it results in a branch circuit outage, and (2) Compound. Sealing compound shall be approved and shall darkness in an entire area. provide a seal against passage of gas or vapors through the seal U/L requires that listed cartridge fuses (such as Buss KTK) be fitting, shall not be affected by the surrounding atmosphere or filled with quartz or other granular matter which prevents flame liquids, and shall not have a melting point of less than 93°C from erupting from the cartridge. (200°F). PANEL RECOMMENDATION: Accept as Revised: VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Substitute the word "Approved" for the word "Listed" and add the words "filled with noncembustible granular material" between the words "fuses" and "shall." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 501-5(e)(2): Reject CMP 14 COMMENT ON VOTE: SUBMITTER: C.E. Muhleman, Marion, IN MILLER: Although I am voting affirmatively, I believe the PI~rOIIO-S'-At-~ 32 Revise as follows: Panel Recommendation restricts the design more than necessary. --T~-- Installed ca~les which limit gas or vapor flow through A more general statement of desired performance would be the cable core to 0.007 cubic feet per hour (0.0551 x 106 preferable. cubic metre per second) at a pressure of 6 inches of water (1490 pascals) at 60~F (15.5°C) shall not be required to be sealed except as required in (e)(1) above. SUBSTANTIATION: The new wording is intended to assure that the 501-6(b)(3): " Accept CMP 14 cables are intact even after the rigors of installation. The SUBMITTER: TSC-Approved for the Purpose new wording also avoids the ambiguous phrase "gas/vapor-tight 35 See the Technical Subcommittee "Recommendations" continuous sheath." un-un'd'e'r--'t-F1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Reject. 100. PANEL COMMENT: Supporting comment is not persuasive as to SUBSTANTIATION: See the TSC "findings" under the definition of necesslty. "Approved for the Purpose" in Article 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Accept as Revised: COMMENT ON VOTE: In line 4 delete "for the purpose and." In line 5 delete "if ADAMS: The parenthetical phrase "0.007 cubic feet per hour of they are approved for the purpose,." air at a pressure of 6 inches of water" causes great concern and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I believe it should be left out. The gas passing through the interstices of the wire strands is included in the above phrase but when referred to the seal fitting It is not included. 501-8(b): Reject CMP 14 SUBMITTER: Ct~° 14 35A Revise 501-8(b)Motors and Generators, Class I, 501-5(e)(4) FPN: Reject CMP 14 ~2. Add a third paragraph as follows: SUBMITTER: K.C. Starkey, The Rockbestos Co. In Class I, Division 2 locations, motors, generators and other I~-O-P-O-~FA-C~- 33 Revise fine print note as follows: rotating electric machinery not approved for Class I, Division 1 ~eath mentioned in (d) and (e) above may be either metal locations shall be permitted only if: or a nonmetallic material .if approved for the purpose. I. Ignition temperature of the gas or vapor involved is 280°C SUBSTANTIATION: Cables with a gas/vapor tight continuou~ sheath (536°F) or higher, and that are sealed in the hazardous location need not be scaled 2. Nameplate is marked not over 80°C temperature rise (85°C when they leave the hazardous location. This applies to for totally enclosed nonventilated construction) by resistance continuous metallic sheathed cable and Type TC cable that is at 100% lo~d or goac temperature rise by resistance at Service approved for the purpose. Factor load, or In the case of a continuous metallic sheath cable the 3. Nameplate is marked to indicate Class A or Class B continuous metal sheath provides the gas/vapor tight sheath. In Insulation System and Maximum Ambient Temperature. approved nonmetallic Type TC cable the cable jacket provides Exception: Motors and generators with Class F or Class H this gas/vapor tight sheath. Insulation System or in installations involving gases or vapors However in a noncontinuous metallic sheathed cable such as having ignition temperatures below 280°C (536°F) shall be interlock armor the gas/vapor tight barrier must be provided by permitted if the maximum rated load operating temperature of any the nonmetallic Jacketing material. exposed surface (including internal parts of all constructions) With a continuous metallic sheath cable a Jacket, when will not exceed 80 percent of the ignition temperature in provided, is for mechanical and/or corrision protection. degrees Celsius oh the gas or vapor involved. Therefore the impervious Jacket over an interlock cable SUBSTANTIATION: The present wording of 501-8(b) was based on construction should re(Iuire the same type and thickness as a relation of exposed motor surface temperatures and gas or vapor Type TC cable. ignition temperatures prevalent some years ago; under the A comparison between the UL required Jacket thickness for conditions then existing, experience has proven that the present mechanical and/or corrosion protection of continuous sheathed wording of this section of the Code provided safe installations. metallic cable and the gas/vapor tight Jacket of a Type TC cable However, the ignition temperature of some of the newer gases is listed below. is approaching the operating temperature of some higher temperature capability motors. Under these more recent CONTINUOUS METAL SHEATH CABLE conditions, safety hazards may exist when applying non-explosion-proof motors per the present wording of the Code. Core O.D. Jacket Thickness The proposed change, then, limits use of open or non-explosion-proof enclosed motors in Class I, Division 2 0-0.425 40 mils locations to the combination of vapor ignition temperature and 0.426-0~750 50 mils motor operating temperature consistent with past practice, or 0.751-1.500 50 mils provides a safe system by limiting motor temperatures to 80 1.501-2.250 60 mils percent of the gas or vapor ignition temperature. 2.251-3.000 75 mils PANEL RECOMMENDATION: Reject. 3.001-& larger 85 mils PANEL COMMENT: Already covered by Section 500-2(a) and (c). VOTE ON PANEL RECOMMENDATION: NONMETALLIC TYPE TC CABLE AFFIRMATIVE: 16. NEGATIVE: Short. Core O.D. Jacket Thickness EXPLANATION OF VOTE: SHORT: The referenced 500-2(a) and (c) are effective for 0-0.425 45 mils listed or certified equipment, but will in no way, prevent the 0.426-0.700 60 mils application of standard and/or stock squirrelcage motors in 0.701-1.500 80 mils Class If, Division 2 areas. Only a specific limitation in 1.501-2.500 110 mils 501-8(b) can be effective in minimizing this potential hazard. 2.501-& larger 140 mils

PANEL RECOMMENDATION: Reject. 501-8ib): Accept CMP 14 PANEL COMMENT: Supporting comment is not persuasive as to SUBMITTER: CMP 14 necessity. F RTOI~S'31t-~: 35B Revise the last part of the last sentence of VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. paragraph one to read "...are provided with enclosures approved for Class I Division 2 locations in accordance with Section 501-3(b)."

233 SUBSTANTIATION: To correct error made by Panel in 1978 NEC. utilizing extra hard-usage multicondutor cords and cables have PANEL RECOMMENDATION: Accept. been used extensively and successfully in the United States and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. throughout the world. They are being used in various configurations in such diverse fields as mining, contracting (building, road, and excavating), dewater!ng, deep-well, and wastewater handling (stormwater, sewage, industrial effluent, 501-9(a)(3): Accept CMP 14 etc.). SUBMITTER: TSC-Approved for the Purpose Especially with the advent of OSHA, and it~ support of the Ri~-RO-POSAL: 36 See the Technical Subcommittee "Recommendations" NEC, more and.more inspection and standards authorities are ~e definition of "Approved for the Purpose" in Article expecting specific guidance from NEC in areas not previously lOO, , explicitly defined. It is the intention of the suggested SUBSTANTIATION: See the TSC "findings ''~ under the definition of ~endment to provide this speciflc guidance. "Approved for the Purpose" in Article 100: Many authorities in the wastewater field (sewage, stormwater, PANEL RECOMMENDATION: Accept as Revised: etc.) in recognizing especially the contribution to maintenance In line 8 delete "for the purpose and." of submersible pumps, have stipulated that in any wet-well VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. installation they be easily removed without the need for personnel to enter or dewater the wet-well. This is provided by all member companies in the industry by means of guide-rail remote guidance system and a simple automatic discharge 501~9(a)(4): Accept CMP 14 connection system which allows indexing and a tight connection SUBMITTER: TSC-Approved for the Purpose (or removal) to be automatically accomplished between the pump ~OSAL: 37 See the Technical Subcommittee "Recommendations" discharge flange and the effluent piping flange. un--6-de-{~-F[e definition of "Approved for the Purpose" in Article In order to maintain the workability of the system and the I00, intent of the specifying Authorities, it is imperative that SUBSTANTIATION: See the TSC "findings" under the definition of flexible cord or cable be used between the place where the "Approved for the Purpose" in Article 100. service enters the wet-well from the pump control (gas-tight PANEL RECOMMENDATION: Accept as Revised: conduit seal or--in the case of Class I, Division I In line 2 delete "for the purpose and." locations--explosion-proof junction or splice box hard wired to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. the pump cable with a suitable compression cable-entry) and the pump cable-entry assembly. This will allow the pump to be lifted from the wet-well through the opened cover in the access frame in the ~round-level 501-9(b)(3): Accept CMP 14 slab by its chain or wire-rope without personnel entering or SUBMITTER: TSC-Approved for the Purpose dewatering the wet-well. 38 See the Technical Subcommittee "Recommendations" In the case of Class I, Division 1 locations, the pump is ~er the definition of "Approved for the Purpose" in Article either explosion-proof and suitable for the installation (there I00. -~ are none Approved at the present time) or redundant low-level SUBSTANTIATION: See the TSC "findings" under the definition of shut-off sensing is provided which guarantees the uppermost "Approved for the Purpose" in Article I00. portion of a standard submersible pump is always,submerged. PANEL RECOMMENDATION: Accept as Revised: These approaches are specified and accepted by the I In line 6 insert "an approved" before "fitting" and delete Administrative Code for the State of Wisconsin and the "approved for the purpose." Department of Industrial Safety for the State of California for VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. some time. . Extra hard-usage cord and cable of the S, SO, ST, STO, W, G, PCG, etc., classes have been used for many years in submersible \ wastewater handling with a perfect safety record in classified 501~9{b)(4): Accept CMP 14 locations. Certainly the application is one where the usage is SUBMITTER: TSC-Approved for the Purpose far less demanding than others like coal mining and general 39 See the Technical Subcommittee "Recemmendations" contracting where these same cables have been universally j~e definition of "Approved for the Purpose" in Article accepted (MESA, Penna. Bureau of Mines, etc.) and successful. 100, PANEL RECOMMENDATION: Accept as Revised: SUBSTANTIATION: See the TSC "findings" under the definition of Revise Exception by adding a new paragraph as follows: "Approved for the Purpose" in A~ticle 100. "Electric submersible pumps with means for removal without I PANEL RECOMMENDATION: Accept as Revised: entering the wet-pit shall be considered portable utilization Delete paragraph and renumber (5) and (6) to (4) and (5). equipment." PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECO~ENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements COMMENT ON VOTE: for support of light fixtures appear elsewhere in the Code. ADAMS: I favor the intent of the Proposal but I feel that the VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Exception should be in two parts with one part in Section 501-I0(a). SCHRAM: My notes indicate the Panel Recemmendation was to add the quoted paragraph to Section 501-11, not to the Exception to 501-10(b)(1)a: Accept CMP 14 Section 501-11. SUBMITTER: O. E. Dillon, Border County Div. IAEI ]~TOI~S'Ai-[." 40 In the first sentence, delete the words "in degrees Celsius"; also delete the words "likely to be" and Ireplace with the words ;'which is." 501-16(b): Accept CMP 14 SUBSTANTIATION: The use of the word "likely" renders this SUBMITTER: Robert B. West, St. Louis, MO section legally unenforceable. See the attached opinion* of the ~42 Revise the last sentence as follows: San Diego City Attorney. ~flexible conduit is used as permitted in Section *See Border County Div. ~EI substantiation for CMP 1 Proposal 501-4(b), internal or external bonding jumpers complying with No. 90 for 110-16(a). the provisions of Section 250-79 shall be installed in parallel PANEL RECOMMENDATION: Accept as Revised: with the conduit.. Leave in "in degrees Cels!us." And add a fine print note as follows: PANEL COMMENT: The words "in degrees Celsius" are essential, See Section 250-78. since 80 percent of a temperature in degrees Fahrenheit and 80 SUBSTANTIATION: The present wording does not cover all of the percent of a temperature in degrees Celsius are not the same requirements fo~ bonding jumpers. For,exa,~)le, Section temperature. 250-79(e) requires external equipment bonding jumpers to be not VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. more than 6 feet in length and t 9 be routed with the conduit. The bonding jumpers that are required for flexible conduit should comply with Section 250-79 which specifies the material, attachment methods, size, and installation requirements for 501;11, Exception No. 2-(New): Accept CMP 14 equipment bonding jumpers. Secretary's Note: It was the action of.the Correlating The proposed fine-print reference to Section 250-78 correlates Committee that further consideration be given to the co,1~ents with the bonding requirements for hazardous locations that are expressed in Mr. Schram's voting. specified in Article 250. SUBMITTER: H. W. T. Dutton, Chicago, IL PANEL RECOMMENDATION:. Accept. 41 Add new exception as follows: VOTE ON PANEL RECOF~4ENDATION: ~ion No. 2: Electric submersible wastewater pumps with AFFIRMATIVE: 16. means for automatic removal without entering or'dewatering the NEGATIVE: Adams. wet-pit shall be considered portable utilization equipment. In EXPLANATION OF VOTE: Class I, Div. 1 locations, the pumps (unless approved for the ADAMS: Section 501-I refers to the general rules of this Code location) shall remain completely submerged under all operating and I do not think these bonding requirements are of a nature conditions with the liquid level at least four inches above "any peculiar to Class I locations. portion of the pump--excepting the extra hard-usage cord or cable. See Section 501-13 for flexible cords exposed to liquids having a deleterious effect on the conductor insulation. SUBSTANTIATION: For over 30 years electric submersible pumps 234 501-16(c): Accept CMP 14 (I) The grounded service conductor shall be connected to a SUBMITTER: Robert B. West, St. Louis, MO grounding electrode at the transformer supplying the service. 43 Revise as follows: (2) A grounding conductor shall be run with the service ~ightning Protection. Each ungrounded service conductor conductors from the supply transformer to the service equipment, of a wiring system in a Class I location, where supplied from an and shall be sized in accordance with the requirements for overhead line in an area where lightning disturbances are sizing the grounded service conductor in Section 250-23(b). The prevalent, shall be protected by a surge arrester that complies grounding conductor shall be bonded to the grounded service with the provisions of Article 280. The surge arresters shall conductor at the transformer supplying the service and to the be connected to the service conductors at an accessible point on equipment grounding conductor(s) at the service equipment. the load side of the service drop, and the arrester grounding (3) The service equipment enclosures, the grounding connections shall compl~ with the applicable provisions of conductor specified in (2) above, and the equipment grounding Article 280. conductor(s) shall be bonded together and connected to a SUBSTANTIATION: A CMP 5 Subcommittee has submitted proposals to grounding electrode by a grounding electrode conductor. update Article 280 to current nomenclature and practices. SUBSTANTIATION: Objectional currents over the grounding Article 280 covers the selection, installation, and connection conductors are caused by multiple grounding connections to the of surge attesters. The proposed revision has references to system grounded conductor, which is the grounded service Article 280 which makes the selection, installation, and conductor in Section 5O1-1B(d). One way to prevent these connection of surge arresters in Class I locations consistent obJectional currents from flowing is to ground the grounded with the updated provisions in Article 280. service conductor at the supply transformer only, and abandon PANEL RECOMMENDATION: Accept as Revised: the grounding connections to the grounded service conductor that In the last sentence delete "at an accessible point on the are specified in Sections 250-23(a), 250-50(a), and 250-53". load side of the service drop." It is perfectly safe to ground the grounded service conductor VOTE ON PANEL RECOMMENDATION: at the supply transformer only, provided the conditions stated AFFIRMATIVE: 16. in (2) and (3) of the proposed revision are met. These NEGATIVE: Adams. conditions assure an adequate conductor for ground-fault current EXPLANATION OF VOTE: to flow from the service equipment to the supply transformer, ADAMS: Section 501-I refers to the ~eneral rules of this Code and the potential between the service equipment enclosures and and I do not think the Lightning Protection requirements are of ground will not be unsafe during ground-fault, conditions. ~The a nature peculiar to Class 1'locations. surge arresters that are specified in Section 501-16(c) provide additional protection at the service equipment by .limiting voltages due to lightning and line surges. The present wording of Section 501-16(f) requires the grounded 501-16(d): Accept CMP 14 service conductor to be grounded at the service equipment if the SUBMITTER: Robert B. West, St. Louis, MO supply system is grounded at any other point. This multiple IqTOlffO'S'A'CT." 44 Revise as follows: system grounding requirement is likely to cause objectional "~----Grounded Service Conductor, Connections at Service currents over the grounding conductors if the service conductors Equipment.. Where a Class I location is supplied from an a÷e installed in metal raceways from the service supply to the alternating-current service and the supply system is solidly service equipment. grounded, the grounded service conductor shall be run to each This proposal correlates with'my proposal to revise Section service according to the requirements in Section 250-23(b) and 501-16(d). shall be grounded according to the requirements in Section PANEL RECOMMENDATION: Accept as Revised: 250-23(a). Bonding connections to the grounded service I The title of this Section will be: "Multiple Grounds." In conductor at the service equipment shall comply with Sections order to correlate with Proposal 45, the number of this Section 250-50(a) and 250-53. Metal enclosures for service conductors will be 501-16(e). and service equipment shall be bonded in accordance with the VOTE ON PANEL RECOMMENDATION: Unanimpusly Affirmative. applicable provisions in Article 250, Part G. Exception: Where the installation complies with all of the conditions specified in Section 501-16(f) and the system grounded conductor is not used as a circuit conductor, a 501-17-(New): Reject CM~ 14 grounded service conductor shall not be required to be run to SUBMITTER: Kenneth L. Paape, Allen Bradley Co. the service eFl.uipment. !~-O-P-O-S-A[-~.'47 Add new section as follows: SUBSTANTIATION: This proposed revision correlates with my Ground-Fault Protection of Equipment, Class I, proposal to revise the text of Section 501-16(f). The proposed Divisions I and 2. rewording and the references to sections in Article 250 Ca) Ground-fault protection shall be provided for each clarifies the intent of Section 501-16(~) because the referenced solidly grounded branch circuit where conductors are not sections contain complete specifications for the general protected against overcurrent i~ accordance with their requirements that are covered in the present text. The proposed ampacities and the circuit is rated more than 50 volts to revision does not change the intent of the present text. ground, but not exceeding 600 volts phase-to-phase in a Class I, PANEL RECOMMENDATION: Accept as Revised: Division 1 or 2 location. The ground-fault protection shall Change reference to 501-16(f) in the Exception to 501L16(e) to operate to open all ungrounded conductors of the faulted correlate with Proposals 45 and 46. circuit. The maximum setting of the ground-fault protection VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. shall be 10 amperes. Anytime-delay in the operation of the ground-fault protection shall be coordinated with the interrupting rating of the branch-circuit disconnecting or controlling means and the rating or setting of the device that 501-16(e): Accept CMP 14 provides overcurrent protection for the branch circuit. SUBMITTER: Robert B. West, St. Louis, /40 Exception No. I: Where the circuit overcurrent protective 45 DeleteSection 501-16(e). device has a rating mr setting not exceeding 100 ~eres. ~IATION: The grounded service conductor of a grounded Exception No. 2: Where an orderly shutdown is required. (See system is required to be run to each service by the provisions Section 240-12). of Section 250-23(b), so the condition stated in Section (b) The ground-fault protection system installed shall meet 501-16(e) is not permitted. Article 250 also contains adequate the performance requirenients of Section 230-95 (b) and (c). provisions for grounding and bonding that apply to Class I SUBSTANTIATION: It has long been recognized in the electrical locations. For example, Section 250-23(a) requires the grounded industry that arcing ground faults occur which damage equipment ~ervice conductor to be grounded at each service. Sections extensively because the. ground fault current is limited by the 250-50(a), 250-50(b), 250-53(a), and 250-53(b) cover bonding and impedance of rigid conduit or is not sustained for a sufficient interconnections between the equipment grounding conductors, the period of time to cause the overcurrent protective device to grounded service conductor, the grounding electrode conductor, clear the fault. As a consequence, damage such as shown in the and the service equipment enclosures. Sections 250-71, 250-72, attached photographcan occur with the emission of sparks and 250-75, 250-76, 250-77, 250-7B, and 250-79 cover bonding molten metal. Such emission can ignite vapors or gases which requirements for the noncurrent-carrying metal parts of may be~present in Class I HazardousLocations. The higher the equipment, raceways and other enclosures on the supply side and rating or setting of the overcurrent protective device the on the load side of the service equipment. greater the probability of extensive damage before the My proposed revision for Section 501-16(f) covers conditions overcurrent protective device responds to the ground-fault which must be complied with where a grounded service conductor current. of a grounded system is not run to the service equipment. Each of the exceptions to the general rule of protecting PANEL RECOMMENDATION: Accept. conductors against overcurrent in accordance with their VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ampacities (see Section 240-3) exists for a good purpose, but involves some degree of risk. Motor branch circuits are particularly vulnerable because motor driven equipment often includes a source of vibration which in turn can cause 501-16(f): Accept ; CMP 14 insulation to abrade in conduit with the result as shown in the SUBMITTER: Robert B. West, St. Louis, /40 photograph. Providing ground-fault protection for equipment in PROPOSAL: 46 Revise the text of (f) as follows: such situations will reduce the risk inherent in circuits where in the application of Section 250-21, it is necessary conductors are not protected in accordance with their ampacities. to abandon the grounding and'bonding connections to the grounded Similar proposals have been submitted for Class II and Class service conductor that are specified in (d) above, the Ill hazardous locations. installation shall comply with all of the following conditions: 235

r PANEL RECOMMENDATION: Reject. 502-4: Accept CMP 14 PANEL COMMENT: The supporting comment does not justify the SUBMITTER: CMP 14 proposed change. PITOI}'O-~TAL-~: 51A Revise second sentence to read: "Cable tray VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I~t be permitted in Class If, Division 1 or 2 locations. SUBSTANTIATION: Cable trays are dust collectors and should not be used in Class II areas. • PANEL RECOMMENDATION: Accept as Revised: ARTICLE 502 -- CLASS II LOCATIONS "Tray" should read "trays." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 502-I: Reject CMP 14 SUBMITTER: G. A. Karstens, American, Feed Manufacturers ~on, F. Lindholm, Association of Operative Millers, J. Healy, Grain Elevator and Processing Society 502-4(a): Reject CMP 14 PROPOSAL: 48 " After the third paragraph add a paragraph as SUBMITTER: K. C. Starkey, The Rockbestos Co. 52 Revise first sentence of (a) as follows: For further information see NFPA 496 Purged and Pressurized In Class If, Division 1 Iocatidns, threaded rigid metal Enclosures for Electrical Equip~mnt - 1974. conduit, threaded steel intermediate metal conduit, Type MI, or SUBSTANTIATION: Material in this bulletin will aid materially Type MC cable employing a continuous smooth or corrugated in describing the proper requirements for motor control centers aluminum sheath with termination fittings approved for the for Class II locations. location shall be the wiring method employed. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: Type MC cable employing a continuous smooth or PANEL COMMEN~: Already covered by Section 500-I. corrugated aluminum sheath has a tight fitting core and is VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. sheathed in an impervious aluminum tube that has superior crush and impact resistance. It has been used widely in Class I, Division 2 and Class II, Division 2 locations by the petroleu M, petrochemical, coal and grain industries. Present continuous 502-i: Accept CMP 14 welding methods make it possible to maintain the accurate OD of Secretary's Note:. It was the action of the Correlating the cable sheath within the UL Standard 886 for maximum Committee that the Panel shall .review their Recommendation with diametric clearance for cylindrical joints. In earlier a view towards correcting grammatical errors. manufacturing processes this was not possible; therefore, the SUBMITTER: W.A. Short, Crouse-Hinds Company termination fitting manufacturers could not properly design a 49 Add a new sentence to the end of 502-1: termination fitting with prope~ barrel length and clearance to --~r~-e-Fe-are only Division 1 locations where Class II, Groups E comply with the UL Standards. and F dusts are present. See Section 500-5(a)3. Termination fitting manufacturers, including Crouse-Hinds, SUBSTANTIATION: The information in 500-5(a)3 is not well have assured us that if the sheath OD can be held constant, a understood in the industry. This wording does not change the termination fitting can be designed to comply with UL Standards. intent, but helps to clarify the information already in the Code. The acceptance of Type MC cable employing a smooth or PANEL RECOMMENDATION: Accept as Revised: corrugated aluminum sheath for use in Class II, Division i After "dusts" add "having a resistivity less than 105 locations will provide "an alternate wiring system that is saYe ohm-cm." and economical to install. The sheath provides a completely VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. impervious tube from connection to ~onnection and with approved termination fittings Will eliminate the possibility of dusts entering the system through joints and couplings. We are submitting the following UL Test Reports* relative to 502-2(b)(3)(2): Accept CMP 14 the physical properties of continuous aluminum sheathed Type MC SUBMITTER: TSC-Nominal Voltage cable including impact, crushing, flexing and dielectric 50 Add "nominal" after "600 volts." withstand; ~O~-S~I~NTIATION: To conform'to the guidelines established by the *Reports have been-supplied to CMP.chairman. TSC on Nominal Voltages. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: The Panel does not ~gree with the supporting PANEL COMMENT: See Panel Comment on Proposal 25. comment. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

502-3: Accept j CMP 14 502-4(b): Reject CMP 14 SUBMITTER: Robert'B. West, St. Louis, MO SUBMITTER: James M. Daly~ The Okonite~Co. PROPOSAL: 51 Revise as follows: 53 Revise as follows: "... or Type MI, MC, SNM, T-3. Surge,Protection, Class II, Divisions I and 2. In i5"CTC-, or MV cable with approved termination fittings shall be geographical locations where lightning disturbances are the wiring method employed. Type MI, MC, SNM, PLTC, or MI/ cable prevalent, and where supplied by overhead services, electric shall be permitted to be installed in cable tray systems and systems in Class II locations shall be protected against shall be installed in a manner to avoid tensile stress at the high-voltage surges. This protection shall include surge termination fittings." , arresters, interconnectlon of all grounds, and surge-protective SUBSTANTIATION: These cable types are permitted in Class I, capacitors. Surge arresters, including their installation and Division 2 locations and it is consistent to also permit their connections, shall comply with Article 280. use in Class II, Division 2 locations. Surge-protective capacitors shall be of a type designed for PANEL RECOMMENDATION: Reject. the specific duty. The capacitor grounding conductors shall be PANEL COMMENT: Cable trays are dust collectors and should not , connected to the grounding ~onductors for the surge arresters. be used in Clas~ II areas. NotePanel's action on Proposal No.' Surge-protective capacitors" shall be connected to each 51A. ungrounded service conductor at the service entrance or service VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. equipment. The capacitors shall be protected by 30-ampere fuses of suitable type and voltage rating, or by automatic circuit breakers of suitable type and rating. Where fuse protection is provided, a disconnecting means shall be installed to disconnect 502:5: Accept,' CMP 14 the fuses from the ungrounded service conductors. Secretary's Note: It was the action of the Correlating SUBSTANTIATION: The proposed revision uses the term "surge Co{~nittee that further consideration be given to the comments arresters" and. references Article 280 which covers the expressed in Mr. Schramts voting. selection, installation, and connection of surge arresters. A SUBMITTER:' G. A. Karstens, American Feed Manufacturers CNP 5 Subcommittee has submitted proposals to update Article 280 ~on, F. Lindholm, Association of Operative Millers, J. to current nomenclature and ~ractices. The grounding Healy, Grain Elevator and Processing Society connections for surge arresters are adequately covered in PROPOSAL: 54 Delete Section 502-5. Article 280 so it is unnecessary to cover thegrounding ~IATION: In Class II, Division i Iocatiohs it is interconnections again in Section 502-3. necessary that motors be adequately sealed in the terminal box The third paragraph in the present text of Section 502-3 is and equipment is designed to be dust-tight. In.Class II, not enforceable and shouldbe deleted. Division 2 locations dust is normally not in suspension. It is The present text requires circuit protection devices for my understanding that there have been some problems with surge-protective capacitors. If fuses are used, a means should vertical or horizontal runs that may be just short of the be provided to disconnect the fuses and capacitors. It is requi~ed length. Dust unlike vapors does not travel within the recommended that CMP 14 review the requirement that fuses by conduit and does not offer a serious problem. exactly 30 amperes while circuit breakers have no specified PANEL RECOMMENDATION: Accept as Revised: current rating. "Where a raceway provides communication between an enclosdre PANEL RECOMMENDATION: Accept. ;that is required to be dust ignition proof and an enclosure in VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative." l:an unclassified locat#on, seals will not be required." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: SCHRAM: The Panel Recommendation is not clear. My notes indicate it was to add the quoted paragraph to Section 502-5. 236 PANEL RECOMMENDATION: Reject. 502-4: Accept CMP 14 PANEL COMMENT: The supporting comment does not justify the SUBMITTER: CMP 14 proposed change. PITOI}'O-~TAL-~: 51A Revise second sentence to read: "Cable tray VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. I~t be permitted in Class If, Division 1 or 2 locations. SUBSTANTIATION: Cable trays are dust collectors and should not be used in Class II areas. • PANEL RECOMMENDATION: Accept as Revised: ARTICLE 502 -- CLASS II LOCATIONS "Tray" should read "trays." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 502-I: Reject CMP 14 SUBMITTER: G. A. Karstens, American, Feed Manufacturers ~on, F. Lindholm, Association of Operative Millers, J. Healy, Grain Elevator and Processing Society 502-4(a): Reject CMP 14 PROPOSAL: 48 " After the third paragraph add a paragraph as SUBMITTER: K. C. Starkey, The Rockbestos Co. 52 Revise first sentence of (a) as follows: For further information see NFPA 496 Purged and Pressurized In Class If, Division 1 Iocatidns, threaded rigid metal Enclosures for Electrical Equip~mnt - 1974. conduit, threaded steel intermediate metal conduit, Type MI, or SUBSTANTIATION: Material in this bulletin will aid materially Type MC cable employing a continuous smooth or corrugated in describing the proper requirements for motor control centers aluminum sheath with termination fittings approved for the for Class II locations. location shall be the wiring method employed. PANEL RECOMMENDATION: Reject. SUBSTANTIATION: Type MC cable employing a continuous smooth or PANEL COMMEN~: Already covered by Section 500-I. corrugated aluminum sheath has a tight fitting core and is VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. sheathed in an impervious aluminum tube that has superior crush and impact resistance. It has been used widely in Class I, Division 2 and Class II, Division 2 locations by the petroleu M, petrochemical, coal and grain industries. Present continuous 502-i: Accept CMP 14 welding methods make it possible to maintain the accurate OD of Secretary's Note:. It was the action of the Correlating the cable sheath within the UL Standard 886 for maximum Committee that the Panel shall .review their Recommendation with diametric clearance for cylindrical joints. In earlier a view towards correcting grammatical errors. manufacturing processes this was not possible; therefore, the SUBMITTER: W.A. Short, Crouse-Hinds Company termination fitting manufacturers could not properly design a 49 Add a new sentence to the end of 502-1: termination fitting with prope~ barrel length and clearance to --~r~-e-Fe-are only Division 1 locations where Class II, Groups E comply with the UL Standards. and F dusts are present. See Section 500-5(a)3. Termination fitting manufacturers, including Crouse-Hinds, SUBSTANTIATION: The information in 500-5(a)3 is not well have assured us that if the sheath OD can be held constant, a understood in the industry. This wording does not change the termination fitting can be designed to comply with UL Standards. intent, but helps to clarify the information already in the Code. The acceptance of Type MC cable employing a smooth or PANEL RECOMMENDATION: Accept as Revised: corrugated aluminum sheath for use in Class II, Division i After "dusts" add "having a resistivity less than 105 locations will provide "an alternate wiring system that is saYe ohm-cm." and economical to install. The sheath provides a completely VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. impervious tube from connection to ~onnection and with approved termination fittings Will eliminate the possibility of dusts entering the system through joints and couplings. We are submitting the following UL Test Reports* relative to 502-2(b)(3)(2): Accept CMP 14 the physical properties of continuous aluminum sheathed Type MC SUBMITTER: TSC-Nominal Voltage cable including impact, crushing, flexing and dielectric 50 Add "nominal" after "600 volts." withstand; ~O~-S~I~NTIATION: To conform'to the guidelines established by the *Reports have been-supplied to CMP.chairman. TSC on Nominal Voltages. PANEL RECOMMENDATION: Reject. PANEL RECOMMENDATION: Accept. PANEL COMMENT: The Panel does not ~gree with the supporting PANEL COMMENT: See Panel Comment on Proposal 25. comment. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

502-3: Accept j CMP 14 502-4(b): Reject CMP 14 SUBMITTER: Robert'B. West, St. Louis, MO SUBMITTER: James M. Daly~ The Okonite~Co. PROPOSAL: 51 Revise as follows: 53 Revise as follows: "... or Type MI, MC, SNM, T-3. Surge,Protection, Class II, Divisions I and 2. In i5"CTC-, or MV cable with approved termination fittings shall be geographical locations where lightning disturbances are the wiring method employed. Type MI, MC, SNM, PLTC, or MI/ cable prevalent, and where supplied by overhead services, electric shall be permitted to be installed in cable tray systems and systems in Class II locations shall be protected against shall be installed in a manner to avoid tensile stress at the high-voltage surges. This protection shall include surge termination fittings." , arresters, interconnectlon of all grounds, and surge-protective SUBSTANTIATION: These cable types are permitted in Class I, capacitors. Surge arresters, including their installation and Division 2 locations and it is consistent to also permit their connections, shall comply with Article 280. use in Class II, Division 2 locations. Surge-protective capacitors shall be of a type designed for PANEL RECOMMENDATION: Reject. the specific duty. The capacitor grounding conductors shall be PANEL COMMENT: Cable trays are dust collectors and should not , connected to the grounding ~onductors for the surge arresters. be used in Clas~ II areas. NotePanel's action on Proposal No.' Surge-protective capacitors" shall be connected to each 51A. ungrounded service conductor at the service entrance or service VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. equipment. The capacitors shall be protected by 30-ampere fuses of suitable type and voltage rating, or by automatic circuit breakers of suitable type and rating. Where fuse protection is provided, a disconnecting means shall be installed to disconnect 502:5: Accept,' CMP 14 the fuses from the ungrounded service conductors. Secretary's Note: It was the action of the Correlating SUBSTANTIATION: The proposed revision uses the term "surge Co{~nittee that further consideration be given to the comments arresters" and. references Article 280 which covers the expressed in Mr. Schramts voting. selection, installation, and connection of surge arresters. A SUBMITTER:' G. A. Karstens, American Feed Manufacturers CNP 5 Subcommittee has submitted proposals to update Article 280 ~on, F. Lindholm, Association of Operative Millers, J. to current nomenclature and ~ractices. The grounding Healy, Grain Elevator and Processing Society connections for surge arresters are adequately covered in PROPOSAL: 54 Delete Section 502-5. Article 280 so it is unnecessary to cover thegrounding ~IATION: In Class II, Division i Iocatiohs it is interconnections again in Section 502-3. necessary that motors be adequately sealed in the terminal box The third paragraph in the present text of Section 502-3 is and equipment is designed to be dust-tight. In.Class II, not enforceable and shouldbe deleted. Division 2 locations dust is normally not in suspension. It is The present text requires circuit protection devices for my understanding that there have been some problems with surge-protective capacitors. If fuses are used, a means should vertical or horizontal runs that may be just short of the be provided to disconnect the fuses and capacitors. It is requi~ed length. Dust unlike vapors does not travel within the recommended that CMP 14 review the requirement that fuses by conduit and does not offer a serious problem. exactly 30 amperes while circuit breakers have no specified PANEL RECOMMENDATION: Accept as Revised: current rating. "Where a raceway provides communication between an enclosdre PANEL RECOMMENDATION: Accept. ;that is required to be dust ignition proof and an enclosure in VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative." l:an unclassified locat#on, seals will not be required." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. COMMENT ON VOTE: SCHRAM: The Panel Recommendation is not clear. My notes indicate it was to add the quoted paragraph to Section 502-5. 236 502-6(b): Accept CMP 14 502-10(b)(3): Accept CiMP 14 SUBMITTER: G. A. Karstens, American Feed Manufacturers SUBMITTER: G. A. Karstens, American Feed Manufacturers ~on, F. Lindholm, Association of Operative Millers, J. ~on, F. Lindholm, Association of Operative Millers, J.. Healy, Grain Elevator and Processing Society Healy, Grain Elevator and Processing Society PROPOSAL: 55 Revise (b) as follows: PROPOSAL: 58 Deletethe reference "Section 502-6(a)(2)" and ~ss If, Division 2 locations, enclosures for fuses, ~with "Section 502-6(b). switches, circuit breakers, and motor controllers, including SUBSTANTIATION: The above wording provides a much clearer pushbuttons, relays and similar devices shall be so designed understanding of the intent of the enclosures for fuses, that: (1) there are no knockout holes provided in the switches, circuit breakers and motor controllers including enclosure, (2) be constructed of substantial sheet metal with pushbuttons and relays and similar devices to be used in Class continuous welded seams, (3) be gasketed with closed cell II, Division 2 locations than that used in 502-6(a)(2) in the expanded cellular rubber gasket of the oil/flame resistant type, present Code. (4) where dust-tight mechanisms are involved they shall be *See proposals for Sections 502-6(b) and 502-7(b)(I). mounted through holes that are gasketed with a closed cell PANEL RECOMMENDATION: Accept as .Revised: ' expanded cellular rubber gasket of the oil/flame resistant type, Replace the words "comply with Section 502-6(a)(2)" with "be (5) doors shall be similarly gasketed, and where hinged shall be idust tight . hinged for horizontal opening and be supplied with an external VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. fastener that requires a tool to open, (6) provisions shall be made for external mounting. SUBSTANTIATION: The above wording provides a much clearer understanding of the intent of the enclosures for fuses, 502-11(a)(3): Accept CMP 14 switches, circuit breakers,and motor controllers including SUBMII'TER: TSC-Approved for the Purpose pushbuttons and relays and similar devices to be used in Class ~59 See the Technical Subcammittee'"Recommendations" II, Division 2 locations than that used i'n 502-6(a)(2) in the under the definition of "Approved for the Purpose" in Article present Code. 100. *See proposals for Sections 502-7(b)(I) and 502-I0(b)(3). SUBSTANTIATION: See the TSC "findings" under the definition of PANEL RECOMMENDATION: Accept as revised: "Approved for the Purpose" in Article i00. r In the third line substitute the word "dust tight" for the PANEL REC~NDATION: Accept as Revised: 'balance of the paragraph after the words "shall be." lq line 7 delete for the purpose and." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.

502-7(b)(I): Accept CMP 14 502-11(a)(4): Accept CMP 14 SUBMITTER: G. A. Karstens, American Feed Manufacturers SUBMITTER: TSC-Approved for the Purpose ~on, F. Lindholm, Association of Operative Millers, J. I~-R'O-P-O-S~-~.'60 See the Technical Subcommittee "Reco~nmendations" Healy, Grain Elevator and Processing Society ~e definition of "Approved for .the Purpose" in Article PROPOSAL: 56 Delete the reference, "Section 502-6(a)(2)" and 100. ~with "Section 502-6(b)." SUBSTANTIATION: See the TSC "findings" under the definition of SUBSTANTIATION: The above wording provides a much clearer "Approved for the Purpose" in Articl e I00. understanding of the intent of the enclosures for fuses, I PANEL RECOMMENDATION: Accept as Revised: switches, circuit breakers and motor controllers including In line 2 delete "for the purpose and." pushbuttons and relays and similar devices to be used in Class VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. II, Division 2 locations than that used in 502-6(a)(2) in the present Code. *See proposals for Sections 502-6(b) and 502-10(b)(3). PANEL RECOMMENDATION: Accept as Revised: 592-11(b)(4): Accept CMP 14 I Revise Section 502-7(b)(1) to read: Switching mechanisms SUBMITTER: TSC-Approved for the Purpose (including,overcurrent devices) associated with control PITOP'o-SrAl_-~.'61 See the TechniCal Subcommittee "Recommendations" transformers, solenoids, impedance coils, and resistors shall be ~e definition of "Approved for the Purpose" in Article provided with dust-tight enclosures. 100. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article 100.

. PANEL RECOMMENDATION: Accept as Revised: I In line 7 add "an approved" before "fitting" and delete 502-8(b): Accept CMP 14 "approved for the purpose." SUBMITTER: G. A. Karstens, American Feed Manufacturers VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ~on, F. Lindholm, Association of Operative Millers, J. Healy, Grain Elevator and Processing Society PROPOSAL: 57 Revise (b) as follows: -'-IL'l~-~-II, Division 2. In Class II, Division 2 locations, 502-11(b)(5): Accept CMP 14 motors, generators and other rotating electrical equipment shall SUBMII-TER: TSC-Approved for the Purpose be totally enclosed non-ventilated, totally encl'osed pipe ~-R'O-FO-~-A[-~: 62 See the Technical Subcommittee "Recommendations" ventilated, or totally enclosed fan cooled for w~ich maximum un--n-de~-~ITe definition of "Approved for the Purpose" in Article full load external surface temperature shall not exceed 120°C 100. (248°F) when operating in free air (not dust blanketed). SUBSTANTIATION: See the TSC "findings" under the definition of SUBSTANTIATION: We have found in many instances that various l'Approved for the Purpose" in Article 100. authorities are of the opinion that the only motor suitable for PANEL RECOMMENDATION: Accept as Revised: Class II, Division 2 locations with the wording of Section I} Delete paragraph and renumber (6) to (5). 502-8(b) as is would be a labeled motor. It is our contention 'PANEL COMMENT: This paragraph does not seam to provide any that labeled motors are not required for use in Class II, specific hazardous location requirements. General requirements Division 2 atmospheres, and the above wording is intended to for support of light fixtures appear elsewhere in the Code. note such. In addition, experience of the industry over many VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. • years denotes that the TEFC motor has operated in Class II, Division 2 locations with good experience. PANEL RECOMMENDATION: Accept as Revised: "Class If, Division 2. In Class II, Division 2 locations, 502-16(b): Reject CMP 14 motors, generators and other rotating electrical equipment shall SUBMITTER: Joseph S.'Dudor, Fluor Engineers and Constructors, be totally enclosed nonventilated, totally enclosed pipe ventilated, totally enclosed fan cooled or dust-ignition-proof PROPOSAL: 63 Revise last sentence as follows: for which maximum full load external temperature shall not flexible conduit is used as permitted in Section 502-4, exceed 120°C (248°F) when operating in free air (not dust internal or external bonding jumpers with proper fittings shall blanketed) and shall have no external openings. be provided. Change Exception (b) to read: "...within dust-tight metal SUBSTANTIATION: Revise Section 502-16(b) to have language housings..." consistent with revision made to Section 501-16(b) in the 1978 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. NEC. The same problem and the same materials are used in COMMENT ON VOTE: applications in both Class I and Class II locations andrthe Code ADAMS: My notes have the Exception to read: "...within rules governing their use should be the same where possible. dust-tight housings." PANEL RECOMMENDATION: Reject. SHORT: The Wording here is a marked improvement over that PANEL COMMENT: Covered by Proposal No. 64. presently in 1978 NEC. However, further improvement will be VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. achieved bythe ~ollowing revisions: (1) Add the following sentence after the words "...and shall have no external openings...": "Normally arcing or sparking parts shall be enclosed in tight metal housings." 502-16(b): Accept CMP 14 (2) In Exception (b) the present 1978 NEC wording "tight SUBMI1-TER: Robert B. West, St. Louis, MO metal housings" should be retained instead of changing to I~qTOITO-S'At-~.• 64 Revise the last sentence as follows: "dust-tight housings." l--I~h-e'~e--flexible conduit is used as permitted in Section 502-4,

/ 237 / internal or external bonding jumpers complying with the grounding electrode at the transformer supplying the service. provisions of Section 250-79 shall be installed parallel with (2) A grounding conductor shall be run with the service the conduit. conductors from the supply transformer to the service equipment, And add a fine print note as follows: and shall be sized in accordance with the requirements for See Section 250-78. sizing the grounded service conductor in Section 250-23(b). The SUBSTANTIATION: The requirements for flexible conduit bonding grounding conducto~ shall be bonded to the grounded service jumpers should be the same in Sections 501-16(b) and 502-16(b). conductor at the transformer supplying the service, and to the The proposed rewording is consistent with my proposal to revise equipment grounding conductor(s) at the service equipment. the last sentence in 501-16(b). (3) The service equipment enclosures, the grounding PANEL RECOMMENDATION: Accept. conductor specified in (2) above, and the equipment grounding VOTE ON PANEL RECOMMENDATION: conductor(s) shall be bonded together and connected to a AFFIRMATIVE: 16. grounding electrode by a grounding electrode conductor. NEGATIVE: Adams. SUBSTANTIATION: Objectional currents over the grounding EXPLANATION OF VOTE: conductors are caused by multiple grounding connections to the ADAMS: I do not believe the proposed revision adds to the system grounded conductor, which is the grounded service clarity of this section. conductor in Section 502-16(d). One way to prevent these / objectional currents from flowing is to ground the grounded service conductor at the supply transformer only, and abandon the grounding connections to the grounded service conductor that 502-16(c): Accept CMP 14 are specified in Sections 250-23(a), 250-50(a), and 250-53. SUBMITTER: Robert B. West, St. Louis, MO It is perfectly safe to ground the grounded service conductor i~R-O-~O-S~AL-~.• 65 Delete Section 502-16(c) at the supply transformer only, provided the conditions stated "S~]I~'TAI~TIATION: This section is unnecessary because lightning in (2) and (3) of the proposed revis!on are met. These protection in Class II locations is adequately covered in conditions assure an adequate conductor for ground-fault current Section 502-3. to flow from the service equipment to the supply transformer and PANEL RECOMMENDATION: Accept. the potential between the service equipment enclosures and VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ground will not be unsafe during ground-fault conditions. The surge protection that is specified in Section 502-3 provides additional protection at the service equipment by limiting voltages due to lightning and line surges. . 502-16(d): Accept CMP 14 The present wording of Section 502-16(f) requires the grounded SUBMITTER: Robert B. West, St. Louis, MO service conductor to be grounded at the service .equipment if the P'FR-O-~'O-S'A-L-~.'66 Revise as follows: supply system is grounded at any other point. This multiple ~rounded Service Conductor, Connections at Service system grounding requirement is likely to cause obJectional Equipment. Where a Class II location is supplied from an current over the grounding conductors if the service conductors alternating-current service and the supply system is solidly are installed in metal raceways from the service supply to the grounded, the grounded service conductor shall be run to each service equipment. service according to the requirements in Section 250-23(b) and This proposal correlates with my proposal to revise Section shall be grounded according to the requirements in Section 502-16(d). 250-23(a). Bonding connections to the grounded service PANEL RECOI~ENDATION: Accept as Revised: conductor at the service equipment shall comply with Sections • The title of this Sectionwill be "Multiple Grounds." In 250-50(a) and 250-53. Metal enclosures for service conductors order to correlate with Proposal Nos. 65, 66 and 67~ the number and service equipment shall be bonded in accordance with the of this Section will be 502-16(d). Change (d) to (c) in the applicable provisions in Article 250, Part G. first sentence oF the Proposal to correlate with Proposal Nos. Exception: Where the installation complies with all of the 65 and 66. conditions specified in Section 502-16(f) and the system VOTE ON PANEL RECOI~MENDATION: Unanimously Affirmative. grounded conductor is not used as a circui~ conductor, a grounded service conductor shall not be required to be run to the service equipment. SUBSTANTIATION: This proposed revision correlates with my 502-17-(New): Reject CMP 14 proposal to revise the text of Section 502-16(f). The proposed SUBMITTER: Kenneth L. Paape, Allen Bradley Co. rewording and the references to sections in Article 250 PITOIIO'~L-~.• 69 Add new section as follows: clarifies the intent of Section 502-16(d) because the referenced ~'O-'~I'/~'-.Ground-Fault Protection of Equipment, Class I, sections contain complete specifications for the general Divisions I and 2. requirements that are covered in the present text. The proposed (a) Ground-fault protection shall be provided for each revision does not change the intent of the present text. solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Accept as Revised. protected against overcurrent in accordance with their Change the Section number to 502-16(c) to correlate with ampacities and the circuit is rated more than 50 volts to iProposal 65, and change 502-16(f) in the Exception to 502-16(d) ground, but exceeding 600 volts phase-to-phase in a Class I, to correlate with Proposal Nos. 67 and 68. Division 1 or 2 location. The ground-fault protection shall VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the ground-fault protection shall" be coordinated with the 502-16(e): Accept CMP 14 interrupting rating of the branch-circuit disconnecting or SUBMITTER: Robert B. West, St. Louis, MO controlling means and the rating or setting of the device that 67 DelebeSection 502-16(e) provides overcurrent protection for the branch circuit. ~'I]I~'FAI~rIATION: The grounded service conductor of a grounded Exception No. i: Where the circuit overcurrent protective system is required to be run to each service by the provisions device has a rating or setting not exceeding 100 an~oeres. of Section 250-23(b), so the condition stated in Section Exception No. 2: Where an orderly shutdown is required. (See 502-16(e) is not permitted. Article 250 also contains adequate Section 240-12.) provisions for grounding and bonding that apply to Class II (b) The ground-fault protection system installed shall meet locations. For example, Section 250-23(a) requires the grounded the performance requirements of Section 230-95 (b) and (c). service conductor to be grounded at each service. Sections SUBSTANTIATION It has long been recognized in the electrical 250-50(a), 250-50(b), 2SO-53(a), and 250-53(b) cover bonding and industry that arcing ground faults occur which damage equipment interconnections between the equipment grounding conductors, the extensively because the ground fault current is limited by the grounded service conductor, the grounding electrode conductor, impedance of rigid conduit or is not sustained for a sufficient and the serviceequipment enclosures. Sections 250-71, 250-72, period of time to cause the overcurrent protective device to 250-75, 250-76, 250-77, 250-78, and 250-79 cover bonding clear the fault. As a consequence, damage such as shown in the requirements for the noncurrent-carrying metal parts of attached photograph can occur with the emission of sparks and equipment, raceways and other enclosures on the supply side and molten metal. Such emission can ignite vapors or gases which on the load'side of the service equipment. may be present in Class I Hazardous Locations. The higher the My proposed revision for Section 502-16[f) covers conditions rating Or setting of the overcurrent protective device the which must be complied with where a grounded service conductor greater the probability of extensive damage before the of a grounded system is not run to the service equipment. overcurrent protective device responds to the ground-fault PANEL RECOMMENDATION: Accept. current. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative.. Each of the exceptions to the general rule of protecting conductors against overcurrent in accordance with their ampacities (See Section 240-3) exists for a good purpose, but involves some degree of risk. Motor branch circuits are 502-16(f): Accept CMP 14 particularly vulnerable because motor driven equipment often SUBMITTER: Robert B. West, St. Louis, MO includes a source of vibration which in turn can cause . ~ 68 Revise the text of (f) as follows: insulation to abrade in conduit with the results as shown in the Where, in the application of Section 250-21, it is necessary photograph. Providing ground-fault protection for equipment in to abandon ~he grounding and bonding connections to the grounded such situations will reduce the risk inherent in circuits where service conductor that are specified in (d) above, the conductors are not protected in accordance with their an~)acities.. installation shall comply with all of the following conditions: Similar proposals have been sub(nitted for Class II and Class (I) The grounded service conductor shall be connected to a Ill hazardous locations. 238 PANEL RECOMMENDATION: Reject. ARTICLE 511 -- COMMERCIAL GARAGES, REPAIR AND STORAGE PANEL COMMENT: The supporting comment does not justify the proposed change. 511-2(f): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PITOPI~SAL-~: 73 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. ARTICLE 503 -- CLASS Ill LOCATIONS SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article lOO. 503-9(c)~ Accept CMP 14 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose I In line 7 insert "suitable" between "other" and "material" 70 See the Technical Subcommittee "Recommendations" delete "approved for the purpose." un-u-~-d~-~-]~e definition of "Approved for the Purpose" =in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. SUBSTANTIATION: See the TSC "findings" under the definiti'on of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: .ARTICLE 513 -- AIRCRAFT HANGARS I In line 6 insert "an approved" before "fitting" delete "approved for the purpose." 513-5(c): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Div. IAEI 74 Delete the words "that are or may be." SUBSTANTIATION: The use of the words "or may be" renders this section legally unenforceable. See the attached opinion* of the 503-9(d): Acce~t CMP 14 San Diego City Attorney. SUBMITTER: TSC-Approved for the Purpose ,*See Border County Div. IAEI substantiation for CMP 1 Proposal 71 See the Technical Subcommittee "Recommendations" No. 90 for 110-16(a). un'un-d-er-tF1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. "Portable lamps that are used within a hangar shall be SUBSTANTIATION: See the TSC "findings" under the definition of approved for the location in which they are used." "Approved for the Purpose" in Article 100. PANEL COMMENT: Panel recommends review of Section 513-5 by N~PA PANEL RECOMMENDATION: Accept as Revised: Committee 409, basically to review use of portable equipment in I Delete paragraph and change (e) to (d). hangars PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements for support of light fixtures appear elsewhere in the Code. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 513-8: Reject CMP 14 SUBMITTER: O. E. Dillon, Border County Div. IAEI ~75 Delete 513-8. 503-17-iNew): Reject ' ,~/ CMP 14 S~IATION: This section is practically unenforceable SUBMITTER: Kenneth L. Paape, ellen Bradley Co. unless the jurisdiction has the man- power to make routine 72 Add new section as follows: inspection of aircraft in aircraft hangers. See the attached 5--0-3--Z17~-. Ground-Fault Protection of Equipment, Class Ill, opinion* of the San Diego City Attorney. Divisions i and 2. *See Border County Div. IAEI substantiation for C~ 1 Proposal (a) Ground-fault protection shall be provided for each No. 90 for 110-16(a). solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Reject. protected against overcurrent in accordance with their PANEL COMMENT: The supporting comment does not justify the ampacities and the circuit is rated more than 50 volts to proposed'change. ground, but exceeding 600 volts phase-to-phase in a Class Ill, VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. Division 1 or 2 location. The ground-fault protection ~hall operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the 513-9: Reject CMP 14 ground-fault protection shall be coordinated with the SUBMITTER: O. E. Dillon, Border County Div. IAEI interrupting rating of the branch-circuit disconnecting or 76 Delete 513-9. controlling means and the rating or setting of the device that ~IATION: This section is practically unenforceable provides overcurrent protection for the branch circuit. unless the Jurisdiction has the man- power to make routine Exception No. I: Where the circuit overcurrent protective inspection of aircraft in aircraft hangers. See the attached device has a rating or setting not exceeding 100 amperes. opinion* of the San Diego City Attorney. Exception No. 2.: Where an orderly shutdowd is required. *See Border County Div. IAEI substantiation for C~ 1 Proposal (See Section 240-12). No. go for 110-16(a). 501-17-(New) PANEL RECOMMENDATION: Reject. (b) The ground-fault protection system installed shall meet PANEL COMMENT: The supporting c~Tfnent does not justify the • the performance requirements of Section 230-95 (b) and (c). proposed change. SUBSTANTIATION It has long been recognized in the electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. industry that arcing ground faults occur which damage equipment extensively because the ground fault current is limited by the impedance of rigid conduit or is not sustained for a sufficient period of time to cause the overcurrent protective device to ARTICLE 514 -- GASOLINE DISPENSING AND SERVICE STATIONS ~° clear the fault. As a consequence, damage such as shown in the attached photograph can occur with the emission of sparks and 514-2: Accept CMP 14 molten metal. Such emission can ignite fibers or flyers which SUBMITTER: Edward C. Sommer NFPA No. 30 S/C General Storage may be present in Class Ill Hazardous Locations. The higher the ~omb. Liquids rating or setting of the overcurrent protective device the PROPOSAL: 77 Delete Section 514-2(a) through (g) andreplace gPeater the probability of extensive damage before the following:' overcurrent protective device responds to the ground-fault The following table shall be applied where Class I liquids are current. stored, handled or dispensed and shall be used to delineate and Each of the exceptions to the general rule of protecting classify service station areas for the purpose of electrical conductors against overcurrent in accordance with their equipment under normal circumstances. It is based on the ampacities (see Section 240-3) exists for a good purpose, but premise that the installation meets all requirements of NFPA No. involves somedegree of risk. Motor branch circuits are 30. Should this not be the case, the inspector shall have the particularly vulnerable because motor driven equipment often authority to determine the extent of the classified area. A includes a source of vibration which in turn can cause classified area shall not extend beyond an unpierced wall, roof insulation to abrade in conduit with the results as shown in the or other solid partition. photograph. Providing ground-fault protection for equipment in SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of such situations will reduce the risk inherent in circuits where Flammable and Combustible Liquids has the basic responsibility conductors are not protected in accordance with their ampacities. for classification of electrical areas in service stations. The Similar proposals have been submitted for Class I and Class II present text in No. 70 is not in complete agreement with No. 30 hazardous locations. and thus presents a conflict. This can be eliminated by: PANEL RECOMMENDATION: Reject. (1) Revision of the existing test in No. 70, or (2) by PANEL COMMENT: The supporting comment does not justify the ' dropping requirements contained in these articles and proposed change. referencing No. 30, or (3) by incorporating the table contained VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in No. 30 into 514-2 of No. 70. Of the three approaches, number 3 is probably the most attractive since it eliminates the conflict and provides information to the inspector without the need for an additional reference code. Updating as changes may be made in No. 30 is not a significant problem sinceboth codes are close in cycles. 239 PANEL RECOMMENDATION: Reject. ARTICLE 511 -- COMMERCIAL GARAGES, REPAIR AND STORAGE PANEL COMMENT: The supporting comment does not justify the proposed change. 511-2(f): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PITOPI~SAL-~: 73 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. ARTICLE 503 -- CLASS Ill LOCATIONS SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article lOO. 503-9(c)~ Accept CMP 14 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose I In line 7 insert "suitable" between "other" and "material" 70 See the Technical Subcommittee "Recommendations" delete "approved for the purpose." un-u-~-d~-~-]~e definition of "Approved for the Purpose" =in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. SUBSTANTIATION: See the TSC "findings" under the definiti'on of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: .ARTICLE 513 -- AIRCRAFT HANGARS I In line 6 insert "an approved" before "fitting" delete "approved for the purpose." 513-5(c): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Div. IAEI 74 Delete the words "that are or may be." SUBSTANTIATION: The use of the words "or may be" renders this section legally unenforceable. See the attached opinion* of the 503-9(d): Acce~t CMP 14 San Diego City Attorney. SUBMITTER: TSC-Approved for the Purpose ,*See Border County Div. IAEI substantiation for CMP 1 Proposal 71 See the Technical Subcommittee "Recommendations" No. 90 for 110-16(a). un'un-d-er-tF1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. "Portable lamps that are used within a hangar shall be SUBSTANTIATION: See the TSC "findings" under the definition of approved for the location in which they are used." "Approved for the Purpose" in Article 100. PANEL COMMENT: Panel recommends review of Section 513-5 by N~PA PANEL RECOMMENDATION: Accept as Revised: Committee 409, basically to review use of portable equipment in I Delete paragraph and change (e) to (d). hangars PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements for support of light fixtures appear elsewhere in the Code. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 513-8: Reject CMP 14 SUBMITTER: O. E. Dillon, Border County Div. IAEI ~75 Delete 513-8. 503-17-iNew): Reject ' ,~/ CMP 14 S~IATION: This section is practically unenforceable SUBMITTER: Kenneth L. Paape, ellen Bradley Co. unless the jurisdiction has the man- power to make routine 72 Add new section as follows: inspection of aircraft in aircraft hangers. See the attached 5--0-3--Z17~-. Ground-Fault Protection of Equipment, Class Ill, opinion* of the San Diego City Attorney. Divisions i and 2. *See Border County Div. IAEI substantiation for C~ 1 Proposal (a) Ground-fault protection shall be provided for each No. 90 for 110-16(a). solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Reject. protected against overcurrent in accordance with their PANEL COMMENT: The supporting comment does not justify the ampacities and the circuit is rated more than 50 volts to proposed'change. ground, but exceeding 600 volts phase-to-phase in a Class Ill, VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. Division 1 or 2 location. The ground-fault protection ~hall operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the 513-9: Reject CMP 14 ground-fault protection shall be coordinated with the SUBMITTER: O. E. Dillon, Border County Div. IAEI interrupting rating of the branch-circuit disconnecting or 76 Delete 513-9. controlling means and the rating or setting of the device that ~IATION: This section is practically unenforceable provides overcurrent protection for the branch circuit. unless the Jurisdiction has the man- power to make routine Exception No. I: Where the circuit overcurrent protective inspection of aircraft in aircraft hangers. See the attached device has a rating or setting not exceeding 100 amperes. opinion* of the San Diego City Attorney. Exception No. 2.: Where an orderly shutdowd is required. *See Border County Div. IAEI substantiation for C~ 1 Proposal (See Section 240-12). No. go for 110-16(a). 501-17-(New) PANEL RECOMMENDATION: Reject. (b) The ground-fault protection system installed shall meet PANEL COMMENT: The supporting c~Tfnent does not justify the • the performance requirements of Section 230-95 (b) and (c). proposed change. SUBSTANTIATION It has long been recognized in the electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. industry that arcing ground faults occur which damage equipment extensively because the ground fault current is limited by the impedance of rigid conduit or is not sustained for a sufficient period of time to cause the overcurrent protective device to ARTICLE 514 -- GASOLINE DISPENSING AND SERVICE STATIONS ~° clear the fault. As a consequence, damage such as shown in the attached photograph can occur with the emission of sparks and 514-2: Accept CMP 14 molten metal. Such emission can ignite fibers or flyers which SUBMITTER: Edward C. Sommer NFPA No. 30 S/C General Storage may be present in Class Ill Hazardous Locations. The higher the ~omb. Liquids rating or setting of the overcurrent protective device the PROPOSAL: 77 Delete Section 514-2(a) through (g) andreplace gPeater the probability of extensive damage before the following:' overcurrent protective device responds to the ground-fault The following table shall be applied where Class I liquids are current. stored, handled or dispensed and shall be used to delineate and Each of the exceptions to the general rule of protecting classify service station areas for the purpose of electrical conductors against overcurrent in accordance with their equipment under normal circumstances. It is based on the ampacities (see Section 240-3) exists for a good purpose, but premise that the installation meets all requirements of NFPA No. involves somedegree of risk. Motor branch circuits are 30. Should this not be the case, the inspector shall have the particularly vulnerable because motor driven equipment often authority to determine the extent of the classified area. A includes a source of vibration which in turn can cause classified area shall not extend beyond an unpierced wall, roof insulation to abrade in conduit with the results as shown in the or other solid partition. photograph. Providing ground-fault protection for equipment in SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of such situations will reduce the risk inherent in circuits where Flammable and Combustible Liquids has the basic responsibility conductors are not protected in accordance with their ampacities. for classification of electrical areas in service stations. The Similar proposals have been submitted for Class I and Class II present text in No. 70 is not in complete agreement with No. 30 hazardous locations. and thus presents a conflict. This can be eliminated by: PANEL RECOMMENDATION: Reject. (1) Revision of the existing test in No. 70, or (2) by PANEL COMMENT: The supporting comment does not justify the ' dropping requirements contained in these articles and proposed change. referencing No. 30, or (3) by incorporating the table contained VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in No. 30 into 514-2 of No. 70. Of the three approaches, number 3 is probably the most attractive since it eliminates the conflict and provides information to the inspector without the need for an additional reference code. Updating as changes may be made in No. 30 is not a significant problem sinceboth codes are close in cycles. 239 PANEL RECOMMENDATION: Reject. ARTICLE 511 -- COMMERCIAL GARAGES, REPAIR AND STORAGE PANEL COMMENT: The supporting comment does not justify the proposed change. 511-2(f): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PITOPI~SAL-~: 73 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. ARTICLE 503 -- CLASS Ill LOCATIONS SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article lOO. 503-9(c)~ Accept CMP 14 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose I In line 7 insert "suitable" between "other" and "material" 70 See the Technical Subcommittee "Recommendations" delete "approved for the purpose." un-u-~-d~-~-]~e definition of "Approved for the Purpose" =in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. SUBSTANTIATION: See the TSC "findings" under the definiti'on of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: .ARTICLE 513 -- AIRCRAFT HANGARS I In line 6 insert "an approved" before "fitting" delete "approved for the purpose." 513-5(c): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Div. IAEI 74 Delete the words "that are or may be." SUBSTANTIATION: The use of the words "or may be" renders this section legally unenforceable. See the attached opinion* of the 503-9(d): Acce~t CMP 14 San Diego City Attorney. SUBMITTER: TSC-Approved for the Purpose ,*See Border County Div. IAEI substantiation for CMP 1 Proposal 71 See the Technical Subcommittee "Recommendations" No. 90 for 110-16(a). un'un-d-er-tF1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. "Portable lamps that are used within a hangar shall be SUBSTANTIATION: See the TSC "findings" under the definition of approved for the location in which they are used." "Approved for the Purpose" in Article 100. PANEL COMMENT: Panel recommends review of Section 513-5 by N~PA PANEL RECOMMENDATION: Accept as Revised: Committee 409, basically to review use of portable equipment in I Delete paragraph and change (e) to (d). hangars PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements for support of light fixtures appear elsewhere in the Code. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 513-8: Reject CMP 14 SUBMITTER: O. E. Dillon, Border County Div. IAEI ~75 Delete 513-8. 503-17-iNew): Reject ' ,~/ CMP 14 S~IATION: This section is practically unenforceable SUBMITTER: Kenneth L. Paape, ellen Bradley Co. unless the jurisdiction has the man- power to make routine 72 Add new section as follows: inspection of aircraft in aircraft hangers. See the attached 5--0-3--Z17~-. Ground-Fault Protection of Equipment, Class Ill, opinion* of the San Diego City Attorney. Divisions i and 2. *See Border County Div. IAEI substantiation for C~ 1 Proposal (a) Ground-fault protection shall be provided for each No. 90 for 110-16(a). solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Reject. protected against overcurrent in accordance with their PANEL COMMENT: The supporting comment does not justify the ampacities and the circuit is rated more than 50 volts to proposed'change. ground, but exceeding 600 volts phase-to-phase in a Class Ill, VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. Division 1 or 2 location. The ground-fault protection ~hall operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the 513-9: Reject CMP 14 ground-fault protection shall be coordinated with the SUBMITTER: O. E. Dillon, Border County Div. IAEI interrupting rating of the branch-circuit disconnecting or 76 Delete 513-9. controlling means and the rating or setting of the device that ~IATION: This section is practically unenforceable provides overcurrent protection for the branch circuit. unless the Jurisdiction has the man- power to make routine Exception No. I: Where the circuit overcurrent protective inspection of aircraft in aircraft hangers. See the attached device has a rating or setting not exceeding 100 amperes. opinion* of the San Diego City Attorney. Exception No. 2.: Where an orderly shutdowd is required. *See Border County Div. IAEI substantiation for C~ 1 Proposal (See Section 240-12). No. go for 110-16(a). 501-17-(New) PANEL RECOMMENDATION: Reject. (b) The ground-fault protection system installed shall meet PANEL COMMENT: The supporting c~Tfnent does not justify the • the performance requirements of Section 230-95 (b) and (c). proposed change. SUBSTANTIATION It has long been recognized in the electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. industry that arcing ground faults occur which damage equipment extensively because the ground fault current is limited by the impedance of rigid conduit or is not sustained for a sufficient period of time to cause the overcurrent protective device to ARTICLE 514 -- GASOLINE DISPENSING AND SERVICE STATIONS ~° clear the fault. As a consequence, damage such as shown in the attached photograph can occur with the emission of sparks and 514-2: Accept CMP 14 molten metal. Such emission can ignite fibers or flyers which SUBMITTER: Edward C. Sommer NFPA No. 30 S/C General Storage may be present in Class Ill Hazardous Locations. The higher the ~omb. Liquids rating or setting of the overcurrent protective device the PROPOSAL: 77 Delete Section 514-2(a) through (g) andreplace gPeater the probability of extensive damage before the following:' overcurrent protective device responds to the ground-fault The following table shall be applied where Class I liquids are current. stored, handled or dispensed and shall be used to delineate and Each of the exceptions to the general rule of protecting classify service station areas for the purpose of electrical conductors against overcurrent in accordance with their equipment under normal circumstances. It is based on the ampacities (see Section 240-3) exists for a good purpose, but premise that the installation meets all requirements of NFPA No. involves somedegree of risk. Motor branch circuits are 30. Should this not be the case, the inspector shall have the particularly vulnerable because motor driven equipment often authority to determine the extent of the classified area. A includes a source of vibration which in turn can cause classified area shall not extend beyond an unpierced wall, roof insulation to abrade in conduit with the results as shown in the or other solid partition. photograph. Providing ground-fault protection for equipment in SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of such situations will reduce the risk inherent in circuits where Flammable and Combustible Liquids has the basic responsibility conductors are not protected in accordance with their ampacities. for classification of electrical areas in service stations. The Similar proposals have been submitted for Class I and Class II present text in No. 70 is not in complete agreement with No. 30 hazardous locations. and thus presents a conflict. This can be eliminated by: PANEL RECOMMENDATION: Reject. (1) Revision of the existing test in No. 70, or (2) by PANEL COMMENT: The supporting comment does not justify the ' dropping requirements contained in these articles and proposed change. referencing No. 30, or (3) by incorporating the table contained VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in No. 30 into 514-2 of No. 70. Of the three approaches, number 3 is probably the most attractive since it eliminates the conflict and provides information to the inspector without the need for an additional reference code. Updating as changes may be made in No. 30 is not a significant problem sinceboth codes are close in cycles. 239 PANEL RECOMMENDATION: Reject. ARTICLE 511 -- COMMERCIAL GARAGES, REPAIR AND STORAGE PANEL COMMENT: The supporting comment does not justify the proposed change. 511-2(f): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PITOPI~SAL-~: 73 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. ARTICLE 503 -- CLASS Ill LOCATIONS SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article lOO. 503-9(c)~ Accept CMP 14 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose I In line 7 insert "suitable" between "other" and "material" 70 See the Technical Subcommittee "Recommendations" delete "approved for the purpose." un-u-~-d~-~-]~e definition of "Approved for the Purpose" =in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. SUBSTANTIATION: See the TSC "findings" under the definiti'on of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: .ARTICLE 513 -- AIRCRAFT HANGARS I In line 6 insert "an approved" before "fitting" delete "approved for the purpose." 513-5(c): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Div. IAEI 74 Delete the words "that are or may be." SUBSTANTIATION: The use of the words "or may be" renders this section legally unenforceable. See the attached opinion* of the 503-9(d): Acce~t CMP 14 San Diego City Attorney. SUBMITTER: TSC-Approved for the Purpose ,*See Border County Div. IAEI substantiation for CMP 1 Proposal 71 See the Technical Subcommittee "Recommendations" No. 90 for 110-16(a). un'un-d-er-tF1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. "Portable lamps that are used within a hangar shall be SUBSTANTIATION: See the TSC "findings" under the definition of approved for the location in which they are used." "Approved for the Purpose" in Article 100. PANEL COMMENT: Panel recommends review of Section 513-5 by N~PA PANEL RECOMMENDATION: Accept as Revised: Committee 409, basically to review use of portable equipment in I Delete paragraph and change (e) to (d). hangars PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements for support of light fixtures appear elsewhere in the Code. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 513-8: Reject CMP 14 SUBMITTER: O. E. Dillon, Border County Div. IAEI ~75 Delete 513-8. 503-17-iNew): Reject ' ,~/ CMP 14 S~IATION: This section is practically unenforceable SUBMITTER: Kenneth L. Paape, ellen Bradley Co. unless the jurisdiction has the man- power to make routine 72 Add new section as follows: inspection of aircraft in aircraft hangers. See the attached 5--0-3--Z17~-. Ground-Fault Protection of Equipment, Class Ill, opinion* of the San Diego City Attorney. Divisions i and 2. *See Border County Div. IAEI substantiation for C~ 1 Proposal (a) Ground-fault protection shall be provided for each No. 90 for 110-16(a). solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Reject. protected against overcurrent in accordance with their PANEL COMMENT: The supporting comment does not justify the ampacities and the circuit is rated more than 50 volts to proposed'change. ground, but exceeding 600 volts phase-to-phase in a Class Ill, VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. Division 1 or 2 location. The ground-fault protection ~hall operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the 513-9: Reject CMP 14 ground-fault protection shall be coordinated with the SUBMITTER: O. E. Dillon, Border County Div. IAEI interrupting rating of the branch-circuit disconnecting or 76 Delete 513-9. controlling means and the rating or setting of the device that ~IATION: This section is practically unenforceable provides overcurrent protection for the branch circuit. unless the Jurisdiction has the man- power to make routine Exception No. I: Where the circuit overcurrent protective inspection of aircraft in aircraft hangers. See the attached device has a rating or setting not exceeding 100 amperes. opinion* of the San Diego City Attorney. Exception No. 2.: Where an orderly shutdowd is required. *See Border County Div. IAEI substantiation for C~ 1 Proposal (See Section 240-12). No. go for 110-16(a). 501-17-(New) PANEL RECOMMENDATION: Reject. (b) The ground-fault protection system installed shall meet PANEL COMMENT: The supporting c~Tfnent does not justify the • the performance requirements of Section 230-95 (b) and (c). proposed change. SUBSTANTIATION It has long been recognized in the electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. industry that arcing ground faults occur which damage equipment extensively because the ground fault current is limited by the impedance of rigid conduit or is not sustained for a sufficient period of time to cause the overcurrent protective device to ARTICLE 514 -- GASOLINE DISPENSING AND SERVICE STATIONS ~° clear the fault. As a consequence, damage such as shown in the attached photograph can occur with the emission of sparks and 514-2: Accept CMP 14 molten metal. Such emission can ignite fibers or flyers which SUBMITTER: Edward C. Sommer NFPA No. 30 S/C General Storage may be present in Class Ill Hazardous Locations. The higher the ~omb. Liquids rating or setting of the overcurrent protective device the PROPOSAL: 77 Delete Section 514-2(a) through (g) andreplace gPeater the probability of extensive damage before the following:' overcurrent protective device responds to the ground-fault The following table shall be applied where Class I liquids are current. stored, handled or dispensed and shall be used to delineate and Each of the exceptions to the general rule of protecting classify service station areas for the purpose of electrical conductors against overcurrent in accordance with their equipment under normal circumstances. It is based on the ampacities (see Section 240-3) exists for a good purpose, but premise that the installation meets all requirements of NFPA No. involves somedegree of risk. Motor branch circuits are 30. Should this not be the case, the inspector shall have the particularly vulnerable because motor driven equipment often authority to determine the extent of the classified area. A includes a source of vibration which in turn can cause classified area shall not extend beyond an unpierced wall, roof insulation to abrade in conduit with the results as shown in the or other solid partition. photograph. Providing ground-fault protection for equipment in SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of such situations will reduce the risk inherent in circuits where Flammable and Combustible Liquids has the basic responsibility conductors are not protected in accordance with their ampacities. for classification of electrical areas in service stations. The Similar proposals have been submitted for Class I and Class II present text in No. 70 is not in complete agreement with No. 30 hazardous locations. and thus presents a conflict. This can be eliminated by: PANEL RECOMMENDATION: Reject. (1) Revision of the existing test in No. 70, or (2) by PANEL COMMENT: The supporting comment does not justify the ' dropping requirements contained in these articles and proposed change. referencing No. 30, or (3) by incorporating the table contained VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in No. 30 into 514-2 of No. 70. Of the three approaches, number 3 is probably the most attractive since it eliminates the conflict and provides information to the inspector without the need for an additional reference code. Updating as changes may be made in No. 30 is not a significant problem sinceboth codes are close in cycles. 239 PANEL RECOMMENDATION: Reject. ARTICLE 511 -- COMMERCIAL GARAGES, REPAIR AND STORAGE PANEL COMMENT: The supporting comment does not justify the proposed change. 511-2(f): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: TSC-Approved for the Purpose PITOPI~SAL-~: 73 See the Technical Subcommittee "Recommendations" under the definition of "Approved for the Purpose" in Article 100. ARTICLE 503 -- CLASS Ill LOCATIONS SUBSTANTIATION: See the TSC "findings" under the definition of "Approved for the Purpose" in Article lOO. 503-9(c)~ Accept CMP 14 PANEL RECOMMENDATION: Accept as Revised: SUBMITTER: TSC-Approved for the Purpose I In line 7 insert "suitable" between "other" and "material" 70 See the Technical Subcommittee "Recommendations" delete "approved for the purpose." un-u-~-d~-~-]~e definition of "Approved for the Purpose" =in Article VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 100. SUBSTANTIATION: See the TSC "findings" under the definiti'on of "Approved for the Purpose" in Article 100. PANEL RECOMMENDATION: Accept as Revised: .ARTICLE 513 -- AIRCRAFT HANGARS I In line 6 insert "an approved" before "fitting" delete "approved for the purpose." 513-5(c): Accept CMP 14 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. SUBMITTER: O. E. Dillon, Border County Div. IAEI 74 Delete the words "that are or may be." SUBSTANTIATION: The use of the words "or may be" renders this section legally unenforceable. See the attached opinion* of the 503-9(d): Acce~t CMP 14 San Diego City Attorney. SUBMITTER: TSC-Approved for the Purpose ,*See Border County Div. IAEI substantiation for CMP 1 Proposal 71 See the Technical Subcommittee "Recommendations" No. 90 for 110-16(a). un'un-d-er-tF1e definition of "Approved for the Purpose" in Article PANEL RECOMMENDATION: Accept as Revised: 100. "Portable lamps that are used within a hangar shall be SUBSTANTIATION: See the TSC "findings" under the definition of approved for the location in which they are used." "Approved for the Purpose" in Article 100. PANEL COMMENT: Panel recommends review of Section 513-5 by N~PA PANEL RECOMMENDATION: Accept as Revised: Committee 409, basically to review use of portable equipment in I Delete paragraph and change (e) to (d). hangars PANEL COMMENT: This paragraph does not seem to provide any VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. specific hazardous location requirements. General requirements for support of light fixtures appear elsewhere in the Code. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 513-8: Reject CMP 14 SUBMITTER: O. E. Dillon, Border County Div. IAEI ~75 Delete 513-8. 503-17-iNew): Reject ' ,~/ CMP 14 S~IATION: This section is practically unenforceable SUBMITTER: Kenneth L. Paape, ellen Bradley Co. unless the jurisdiction has the man- power to make routine 72 Add new section as follows: inspection of aircraft in aircraft hangers. See the attached 5--0-3--Z17~-. Ground-Fault Protection of Equipment, Class Ill, opinion* of the San Diego City Attorney. Divisions i and 2. *See Border County Div. IAEI substantiation for C~ 1 Proposal (a) Ground-fault protection shall be provided for each No. 90 for 110-16(a). solidly grounded branch circuit where conductors are not PANEL RECOMMENDATION: Reject. protected against overcurrent in accordance with their PANEL COMMENT: The supporting comment does not justify the ampacities and the circuit is rated more than 50 volts to proposed'change. ground, but exceeding 600 volts phase-to-phase in a Class Ill, VOTE ON PANEL RECOMMENDATION: UnanimouslyAffirmative. Division 1 or 2 location. The ground-fault protection ~hall operate to open all ungrounded conductors of the faulted circuit. The maximum setting of the ground-fault protection shall be 10 amperes. Any time-delay in the operation of the 513-9: Reject CMP 14 ground-fault protection shall be coordinated with the SUBMITTER: O. E. Dillon, Border County Div. IAEI interrupting rating of the branch-circuit disconnecting or 76 Delete 513-9. controlling means and the rating or setting of the device that ~IATION: This section is practically unenforceable provides overcurrent protection for the branch circuit. unless the Jurisdiction has the man- power to make routine Exception No. I: Where the circuit overcurrent protective inspection of aircraft in aircraft hangers. See the attached device has a rating or setting not exceeding 100 amperes. opinion* of the San Diego City Attorney. Exception No. 2.: Where an orderly shutdowd is required. *See Border County Div. IAEI substantiation for C~ 1 Proposal (See Section 240-12). No. go for 110-16(a). 501-17-(New) PANEL RECOMMENDATION: Reject. (b) The ground-fault protection system installed shall meet PANEL COMMENT: The supporting c~Tfnent does not justify the • the performance requirements of Section 230-95 (b) and (c). proposed change. SUBSTANTIATION It has long been recognized in the electrical VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. industry that arcing ground faults occur which damage equipment extensively because the ground fault current is limited by the impedance of rigid conduit or is not sustained for a sufficient period of time to cause the overcurrent protective device to ARTICLE 514 -- GASOLINE DISPENSING AND SERVICE STATIONS ~° clear the fault. As a consequence, damage such as shown in the attached photograph can occur with the emission of sparks and 514-2: Accept CMP 14 molten metal. Such emission can ignite fibers or flyers which SUBMITTER: Edward C. Sommer NFPA No. 30 S/C General Storage may be present in Class Ill Hazardous Locations. The higher the ~omb. Liquids rating or setting of the overcurrent protective device the PROPOSAL: 77 Delete Section 514-2(a) through (g) andreplace gPeater the probability of extensive damage before the following:' overcurrent protective device responds to the ground-fault The following table shall be applied where Class I liquids are current. stored, handled or dispensed and shall be used to delineate and Each of the exceptions to the general rule of protecting classify service station areas for the purpose of electrical conductors against overcurrent in accordance with their equipment under normal circumstances. It is based on the ampacities (see Section 240-3) exists for a good purpose, but premise that the installation meets all requirements of NFPA No. involves somedegree of risk. Motor branch circuits are 30. Should this not be the case, the inspector shall have the particularly vulnerable because motor driven equipment often authority to determine the extent of the classified area. A includes a source of vibration which in turn can cause classified area shall not extend beyond an unpierced wall, roof insulation to abrade in conduit with the results as shown in the or other solid partition. photograph. Providing ground-fault protection for equipment in SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of such situations will reduce the risk inherent in circuits where Flammable and Combustible Liquids has the basic responsibility conductors are not protected in accordance with their ampacities. for classification of electrical areas in service stations. The Similar proposals have been submitted for Class I and Class II present text in No. 70 is not in complete agreement with No. 30 hazardous locations. and thus presents a conflict. This can be eliminated by: PANEL RECOMMENDATION: Reject. (1) Revision of the existing test in No. 70, or (2) by PANEL COMMENT: The supporting comment does not justify the ' dropping requirements contained in these articles and proposed change. referencing No. 30, or (3) by incorporating the table contained VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. in No. 30 into 514-2 of No. 70. Of the three approaches, number 3 is probably the most attractive since it eliminates the conflict and provides information to the inspector without the need for an additional reference code. Updating as changes may be made in No. 30 is not a significant problem sinceboth codes are close in cycles. 239 There is a further advantage since the table proposed for or other solid partition." See write-up that was used at the inclusion in No. 70 is more complete and covers classified areas Denver meeting of CMP 14. See also the first paragraph of Panel not presently covered in No. 70. Recommendation on Proposal No. 87. "PANEL RECOMMENDATION: Accept as Revised: SCHRAM: My notes indicate the change in line 3 was to change I Substitute the words "The following table" with "Table "service station areas" to "service stations." 514-2". Incorporate Table 7-1 from NFPA 30 into 514-2 of NFPA EXPLANATION OF VOTE: 70. (See enclosed editorial modifications.) In line 3 change ADAMS: I think a better resolution of the differences between "station" to "stations" and delete remainder of Proposal. NFPA 30 and this section would be a reference to NFPA 30 at this VOTE ON PANEL RECOMMENDATION: point. I am opposed to copying other NFPA publications in the AFFIRMATIVE: 16. NEC. NEGATIVE: Adams. , COI~MENT ON VOTE: gWERS: The last sentence of the proposal should remain: "A classified area shall not-extend beyond an unpierced wall, roof

Table 514-2 Class I Locations -- Service Stations

"-¢-~' Class I, Group D Divifion ;~, Class I Location

UNDERGROUND TANK Fill Opening Any pit, box or space below grade level, any part of which is within thc Division I or 2 ,I __i fiocation. 1 h • Up to 18 inches above grade Icvcl within a horizontal radius of 10 feet from ,a loose fill connection and within a horizontal radius of 5 feet from a fight fill connection. Vent- Discharging Upward Within 3 feet of open end of vent, extending in all directions. ~ /Uat"-k~etween 3 feet and 5 feet " ( ~pace I of open end of vent, extending in all directions. DISPENSING UNITS (except overhead type) Pits 1 Any pit, box or space below grade level, any part of which is within the Division 1 or 2 c'.:-2 rlocation

Dispenser 1 The~within a dispenser enclosure up to 4 feet vertically above the base except that ...c-- defined as Division 2. Any .... I /.._~r'~_~..~ within a nozzle boot. 2 Am~f'-within a dispenser enclosure above the Division 1 a,,,.FA,,~ ~imm a ~ .p~.er ~cation.] enclosure isolated from D,vision 4Lbpacesj 1 by a solid partition or a solid nozzle boot but not completely surrounded by Division 1 ~ |/0cati0nl Within 18 inches horizontally in .~ - all directions from the Division 1 ~10cati0~J at,ml'/~at~ect wlthtrr the mspenser enclosure. Within 18 inches horizontally in , all directions from~ the opening of a nozzle boot not isolated by a vapor-fight partition, excent ~ation that the dassitled ~Nd--~nneed n~t 1 be extended around a 90* or greater corner.

240 Table 514-2 --. continued

Class I, Group D Extent of Location Division 4m~Class I Location

Outdoor Up to 18 inches above grade level within 20 feet horizontally of any edge of enclosure. INDOOR Up to 18 inches above grade or with Mechanical Ventilation floor level within 20 feet horizontally of any edge of enclmure. with Gravity Ventilation Up to 18 inches above grade or floor level within 25 feet horizontally of any edge of enclosure.

DISPENSING UNITS~ Ovza~m~ Tcp~ Within the dispenser enclosure and 18 inches in all directions from the enclosure where not suitably cut off by ceiling or wall. All electrical equipment integral with the dispensing hose or nozzle. extending-- 2 feet hori- IA space_] zontally in all directions beyond the Division 1 *Nd anna exfend- - ~l ocationJ hag to grade below this cJa~ifled ~ocation.l UI) to 18 inches above grade level within 20 feet horizontally measured from a point vertically below the ecl.ge of any dispenser enclosure. R~uo~g Puup -- C~ooR 1 Any pit, box or space below grade level ff any part is within a horizontal distance of 10 feet from any edge of pump. Within 3 feet of any edge of pump, extending in all directions. Also up to 18 inches above grade level within 10 feet horizontally from any edge of pump.

]~LlluOTg PuMP -- INDOOR Entire jmr'GTthin any pit. Within 5 feet of any edge of p.ump, extending in all direc- uons. Also up to 3 feet above floor or grade level within 25 feet horizontally from any edge of pump.

241 Table 514-2 -- continued

Chins I, Group D Location Division ~Class I Location

LUBRICATION OR SERVICE Roou I Any pit within any unventilated -- with Dispensing area. 2 Any pit with ventilatiofi. 2 up to 18 inches above floor or grade level and 3 feet horizontally from a lubrication pit. , Dispenser for Class I Liquids Within 3 feet of any fill or dispensing point, extending in all directions.

LUBRICATION OR SERVIC~g ROOM -- WITHOUT DISPENSING Entire ~within any pit used for lubrication or similar services where Oasa I liquids may be re- leased. . spac ~Rtlup to 18 inches above any such pit, and extending a distance of 3 feet horizontally from any edge Of the pit.

SPECIAL ENCLOSURE INSmR { 1 Entire enclosure. Btm.DmO PEa 7-2.2

SALES, STORAGE AND ~ If there is any opening to these REST ROOMS 0rdi nary rooms within fife extent of a Di- vision 1 q~g-the entire room [location; 7 shall be classified as Division I.

VAPOR PROCESSING SYSTEMS Prrs Any pit, box or space below grade level, any part of which is r~. a t i 0 n' ~ within a Division 1 oi 2 ~a~@'=====~ I 0C or which houses any equip- L. ment used to transport or process vapors.

VAPOR Within any protective enclosure PROCESSING housing vapor processing equip- F_.,QUIPM~gNT ment. LOCATIgD WrrHm PaOTRO~W ~CLOSLrgES

242 i Table 514-2 -- continued

Class I, Group D ~.. Extent of l~tion Division -~ -- :_-_ , Class I Location

" VAPOR The space within 18 inches in PROC~SSINO all directions of equipment con- F_.~QuiPMENT taining ' flammable vapor or NOT WITHIN liquid extending to grade level. PROTECTV,'E Up to 18 inchea above grade ENCLOSURZS (excludin~ level within 10 ft. horizontally of piping and combustion devices the vapor processing equipment.

EQUIPMENT Any a~E-within the enclosure ENCLOSURES where vapor or liquid is present under normal operating conditions. ~The entire ~f'~within the enclosure other than Division 1.

VACUUM The space within 18 inches in ASSIST all directions extending to grade BLOWERS level. Up to 18 inches above grade level within 10 feet horizontally,

243 514-2(a): Reject CMP 14 514-8: Reject CMP 14 SUBMITTER: Gene Mittermaier, Gasoline Pump Manufacturers Assn. SUBMITTER: Idaho Chapter IAEI 78 Revise as follows: I~TOFO-S'7~-L-~.'82 Delete all the rest of the Section beyond "or --T~T--I~ispenser. The area within a dispenser e~closure ~p to 4 where buried" in the second line which eliminates the use of feet vertically above the base and the area within a nozzle boot nonmetallic conduit in a Class I Division I area. is a Class I, Division 1 location, except that area defined as SUBSTANTIATION: There is no provision for the possibility of Division 2. extending the nonmetallic raceway out into a nonhazardous area The following areas are considered Division 2: Areas within a where grade level is such that the include will permit this. dispenser enclosure above the Division i area. Areas within a Nonmetallic conduit cannot be sealed. Article 514 states "where dispenser enclosure isolated from Division I by a sol~d .buried under not less than two feet.etc" does not necessarily partition or a solid nozzle boot but not completely surrounded' prohibit extending the NM conduit directly into a nonhazardous by a Division i area. location in a basement frem this burial depth. Within 18'inches horizontally in all directions from the PANEL RECOMMENDATION: Reject. Division i area located within the dispenser enclosure. Within PANEL COMMENT: See Panel action on Proposal No. 81. 18 inches horizontally in all directions from the opening of a VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. nozzle boot not isolated by a vapor-tight partition, except that the classified area need not be extended around a.9O degree or greater corner. SUBSTANTIATION: This change is needed so that 514-2 will agree 514-8: Reject CMP 14 with Tab|e 7-1 of Code 30. SUBMITTER: Idaho Chapter IAEI PANEL RECOMMENDATION:- Reject. !~ITOI~}'S'AI-~.• 83 In the second sentence, add the words "threaded PANEL COMMENT: See Panel action on Proposal No. 77 and send to rigid metal conduit or threaded steel intermediate metal conduit NFPA 30 Committee. shall be used for the last two feet of the underground'run to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. emergence" after the words "nonmetallic conduit is used." SUBSTANTIATION~ As now written "where not buried under not less than two feet of earth," does not prevent the nonmetallic conduit from being extended directly into a nonhazardous area 514-2(h)-(New): Reject CMP 14 basement at this level. The nonmetallic conduit cannot be SUBMITTER: Keith Bell amy, Canada, MN sealed. 79 Add new (h) as follows: PANEL RECOMMENDATION: Reject. Th~ The space above the Class I Division 1 locations set out PANEL COMMENT: See Panel action on Proposal No. 81. in Section 514-2(a) shall be classified as Class I Division 2 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. locations, which shall extend to a height of 18 inches above the Class I Division i locations. The space between 18 inches and 36 inches horizontally from the dispenser shall be classified as a Class I Division 2 location up to 5- feet 6-inches above the 514-8: Reject CMP 14 dispenser base. SUBMITTER: IdahoChapter IAEI SUBSTANTIATION: Section 500-4(b)(3) defines a space adjacent to ~84 Delete the remainder of the section after the a Class I Division I location as a Class I Division 2 location. ~hreaded steel intermediate metal conduit." Section 514-2(a) states that space within a dispenser, up to 4 SUBSTANTIATION: Delete all the rest of the section beyond "or feet above the base and a space within 18 inches horizontally of where buried" in the second line which eliminates the use of the dispenser up to 4 feet above the base shall be classified as nonmetallic conduit in a Class i Division I area. Class I Division 1 locations. Section 514-2(b) states that any There is no provision for the possibility of extending the space beyond the Class I Division I location within 20 feet nonmetallic raceway out into a nonhazardous area where grade horizontally of the dispenser and up to 18 inches above the level is such that the incline will permit this. Nonmetallic driveway shall be classified as a Class I Division 2 location. conduit cannot be sealed. Article 514 states "where buried Nowhere in the Code does it specify what the space directly under not less than two feet, etc." does not necessarily above the dispenser or the space above the Class I Division I prohibit extending the NM conduit directly into a nonhazardous location surrounding the dispenser are to be classified. Nor location in a basement from this burial depth. does the Code specify what the space beyond the 18 inches PANEL RECOMMENDATION: Reject. horizontally from the dispenser shall be. In othe~words, there PANEL COMMENT: See Panel action on Proposal No. 81. appears to be a void which the above proposal would look after. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 77 and send to NFPA 30 Committee. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ARTICLE 515 -- BULK-STORAGE PLANTS 515-1 and 515-2(h)-(New): Reject CMP 14 SUBMITTER: R. S. Pihkerton, Los Angeles, CA l 514-8: Reject CMP 14 PROPOSAL: 85 Add a new sentence to 515-1 as follows: SUBMITTER: H. F. van der.Voort, Cleveland, OH ~esignation shall also include locations where ships ~80 In first sentence delete: "where buried under carrying bulk cargos of gasoline or other volatile Flammable not less than 2 feet of earth, it shall be permitted in.", and liquids are loaded or unloaded. in last sentence delete: "Exception No. 3 of." And add a new (h) as follows: SUBSTANTIATION: This reflects intent of Section'3OO-5(a), which (h) Loading and Unloading of Tanker Ships. permits burial depths of 18 inches and exceptions thereto. (i) The entire horizontal area of the loading dock and the PANEL RECOMMENDATION: Reject. horizontal area extending 35 feet in all directions from the PANEL COMMENT: Present requirement is necessary because of tanker loading dock and continuing 15 feet inland measured from normal heavy vehicular traffic. the mean high tide line shall be considered a Class I Division 2 VOTE ON 'PANEL RECOMMENDATION: Unanimously Affirmative. , location. The Class I Division 2 shall also extend, vertically, below the dock to the water and upward to a level of 100 feet above the surface of the loading dock. Exception: The hazardous location shall not be required to 514-8: Accept CMP 14 extend more than 18 inches above that portion of the grade, dock SUBMITTER: Idaho Chapter IAEI or ramp which is more than 35 feet from the ship side of the PROPOSAL: 81 In the fifth line after the word "used," add loading dock. ~t-f~ea-d-ed rigid metal conduit or threaded steel intermediate a. The Class I Division 2 location shall extend 25 feet in metal conduit shall be used for the last two feet of the all directions from the surface of the loading hose manifgld. underground run to e~ergence;". The second sentence in Section b. The interior of a building, any portion which is located 514-8 would then read: "Where rigid nonmetallic conduit is in a Class I Division 2 location, shall be classified as a Class used, threaded rigid metal conduit or threaded steel I Division 2 location. intermediate metal conduit shall be used for the last two feet Exception: Buildings which are provided with satisfactory of the underground run to emergence; or to the point of positive pressure ventilation, and safeguards, with air taken connection to the above ground raceways; an equipment grounding from a clean air source may be considered to be a nonhazardous conductor shall be included to provide electrical continuity of location. the raceway system and for grounding of noncurrent-carrying SUBSTANTIATION: Following an explosion aboard an oil tanker metal parts." which destroyed the ship at its dock in the Los Angeles City SUBSTANTIATION: As now written "where not buried under not less harbor a Task Force was appointed to study the causes and than two feet of earth," does not prevent the nonmetallic recommend regulations which would minimize the chances of conduit from being extended directly into a nonhazardous area another such accident. The Task Force discovered that the basement at this level. The nonmetallic conduit cannot be Electrical Code requirements dealing with the installation of sealed. electric wiring on tanker loading docks were weak and PANEL RECOMMENDATION: Acc%pt. inadequate, (Note: LA City Code requirements for hazardous VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. locations are the same as NEC), and accordingly appointed an ad-hoc Electrical Code Advisory Committee to study the problem and propose appropriate changes to the Los Angeles City Electrical Code. A survey of National Codes, standards or other publications 244

i 514-2(a): Reject CMP 14 514-8: Reject CMP 14 SUBMITTER: Gene Mittermaier, Gasoline Pump Manufacturers Assn. SUBMITTER: Idaho Chapter IAEI 78 Revise as follows: I~TOFO-S'7~-L-~.'82 Delete all the rest of the Section beyond "or --T~T--I~ispenser. The area within a dispenser e~closure ~p to 4 where buried" in the second line which eliminates the use of feet vertically above the base and the area within a nozzle boot nonmetallic conduit in a Class I Division I area. is a Class I, Division 1 location, except that area defined as SUBSTANTIATION: There is no provision for the possibility of Division 2. extending the nonmetallic raceway out into a nonhazardous area The following areas are considered Division 2: Areas within a where grade level is such that the include will permit this. dispenser enclosure above the Division i area. Areas within a Nonmetallic conduit cannot be sealed. Article 514 states "where dispenser enclosure isolated from Division I by a sol~d .buried under not less than two feet.etc" does not necessarily partition or a solid nozzle boot but not completely surrounded' prohibit extending the NM conduit directly into a nonhazardous by a Division i area. location in a basement frem this burial depth. Within 18'inches horizontally in all directions from the PANEL RECOMMENDATION: Reject. Division i area located within the dispenser enclosure. Within PANEL COMMENT: See Panel action on Proposal No. 81. 18 inches horizontally in all directions from the opening of a VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. nozzle boot not isolated by a vapor-tight partition, except that the classified area need not be extended around a.9O degree or greater corner. SUBSTANTIATION: This change is needed so that 514-2 will agree 514-8: Reject CMP 14 with Tab|e 7-1 of Code 30. SUBMITTER: Idaho Chapter IAEI PANEL RECOMMENDATION:- Reject. !~ITOI~}'S'AI-~.• 83 In the second sentence, add the words "threaded PANEL COMMENT: See Panel action on Proposal No. 77 and send to rigid metal conduit or threaded steel intermediate metal conduit NFPA 30 Committee. shall be used for the last two feet of the underground'run to VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. emergence" after the words "nonmetallic conduit is used." SUBSTANTIATION~ As now written "where not buried under not less than two feet of earth," does not prevent the nonmetallic conduit from being extended directly into a nonhazardous area 514-2(h)-(New): Reject CMP 14 basement at this level. The nonmetallic conduit cannot be SUBMITTER: Keith Bell amy, Canada, MN sealed. 79 Add new (h) as follows: PANEL RECOMMENDATION: Reject. Th~ The space above the Class I Division 1 locations set out PANEL COMMENT: See Panel action on Proposal No. 81. in Section 514-2(a) shall be classified as Class I Division 2 VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. locations, which shall extend to a height of 18 inches above the Class I Division i locations. The space between 18 inches and 36 inches horizontally from the dispenser shall be classified as a Class I Division 2 location up to 5- feet 6-inches above the 514-8: Reject CMP 14 dispenser base. SUBMITTER: IdahoChapter IAEI SUBSTANTIATION: Section 500-4(b)(3) defines a space adjacent to ~84 Delete the remainder of the section after the a Class I Division I location as a Class I Division 2 location. ~hreaded steel intermediate metal conduit." Section 514-2(a) states that space within a dispenser, up to 4 SUBSTANTIATION: Delete all the rest of the section beyond "or feet above the base and a space within 18 inches horizontally of where buried" in the second line which eliminates the use of the dispenser up to 4 feet above the base shall be classified as nonmetallic conduit in a Class i Division I area. Class I Division 1 locations. Section 514-2(b) states that any There is no provision for the possibility of extending the space beyond the Class I Division I location within 20 feet nonmetallic raceway out into a nonhazardous area where grade horizontally of the dispenser and up to 18 inches above the level is such that the incline will permit this. Nonmetallic driveway shall be classified as a Class I Division 2 location. conduit cannot be sealed. Article 514 states "where buried Nowhere in the Code does it specify what the space directly under not less than two feet, etc." does not necessarily above the dispenser or the space above the Class I Division I prohibit extending the NM conduit directly into a nonhazardous location surrounding the dispenser are to be classified. Nor location in a basement from this burial depth. does the Code specify what the space beyond the 18 inches PANEL RECOMMENDATION: Reject. horizontally from the dispenser shall be. In othe~words, there PANEL COMMENT: See Panel action on Proposal No. 81. appears to be a void which the above proposal would look after. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PANEL RECOMMENDATION: Reject. PANEL COMMENT: See Panel action on Proposal No. 77 and send to NFPA 30 Committee. VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. ARTICLE 515 -- BULK-STORAGE PLANTS 515-1 and 515-2(h)-(New): Reject CMP 14 SUBMITTER: R. S. Pihkerton, Los Angeles, CA l 514-8: Reject CMP 14 PROPOSAL: 85 Add a new sentence to 515-1 as follows: SUBMITTER: H. F. van der.Voort, Cleveland, OH ~esignation shall also include locations where ships ~80 In first sentence delete: "where buried under carrying bulk cargos of gasoline or other volatile Flammable not less than 2 feet of earth, it shall be permitted in.", and liquids are loaded or unloaded. in last sentence delete: "Exception No. 3 of." And add a new (h) as follows: SUBSTANTIATION: This reflects intent of Section'3OO-5(a), which (h) Loading and Unloading of Tanker Ships. permits burial depths of 18 inches and exceptions thereto. (i) The entire horizontal area of the loading dock and the PANEL RECOMMENDATION: Reject. horizontal area extending 35 feet in all directions from the PANEL COMMENT: Present requirement is necessary because of tanker loading dock and continuing 15 feet inland measured from normal heavy vehicular traffic. the mean high tide line shall be considered a Class I Division 2 VOTE ON 'PANEL RECOMMENDATION: Unanimously Affirmative. , location. The Class I Division 2 shall also extend, vertically, below the dock to the water and upward to a level of 100 feet above the surface of the loading dock. Exception: The hazardous location shall not be required to 514-8: Accept CMP 14 extend more than 18 inches above that portion of the grade, dock SUBMITTER: Idaho Chapter IAEI or ramp which is more than 35 feet from the ship side of the PROPOSAL: 81 In the fifth line after the word "used," add loading dock. ~t-f~ea-d-ed rigid metal conduit or threaded steel intermediate a. The Class I Division 2 location shall extend 25 feet in metal conduit shall be used for the last two feet of the all directions from the surface of the loading hose manifgld. underground run to e~ergence;". The second sentence in Section b. The interior of a building, any portion which is located 514-8 would then read: "Where rigid nonmetallic conduit is in a Class I Division 2 location, shall be classified as a Class used, threaded rigid metal conduit or threaded steel I Division 2 location. intermediate metal conduit shall be used for the last two feet Exception: Buildings which are provided with satisfactory of the underground run to emergence; or to the point of positive pressure ventilation, and safeguards, with air taken connection to the above ground raceways; an equipment grounding from a clean air source may be considered to be a nonhazardous conductor shall be included to provide electrical continuity of location. the raceway system and for grounding of noncurrent-carrying SUBSTANTIATION: Following an explosion aboard an oil tanker metal parts." which destroyed the ship at its dock in the Los Angeles City SUBSTANTIATION: As now written "where not buried under not less harbor a Task Force was appointed to study the causes and than two feet of earth," does not prevent the nonmetallic recommend regulations which would minimize the chances of conduit from being extended directly into a nonhazardous area another such accident. The Task Force discovered that the basement at this level. The nonmetallic conduit cannot be Electrical Code requirements dealing with the installation of sealed. electric wiring on tanker loading docks were weak and PANEL RECOMMENDATION: Acc%pt. inadequate, (Note: LA City Code requirements for hazardous VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. locations are the same as NEC), and accordingly appointed an ad-hoc Electrical Code Advisory Committee to study the problem and propose appropriate changes to the Los Angeles City Electrical Code. A survey of National Codes, standards or other publications 244

i dealing with the handling of flommable liquids or gases revealed point was well delineated and gave the Committee a very real and that there are no existing standards for electrical systems practical guide in establishing the parameters of locations which are located on tanker loading docks. One publication, The classified as hazardous. National Oil Tanker and"Terminal Safety Guide, did provide The recommendations in the Oil Tanker and Terminal Safety helpful background information which enabled the Con~ittee to Guide are consistent withNFPA Pamphlet No. 497-1975, develop valid, practical standards• CLASSIFICATION OF CLASS 1 HAZARDOUS LOCATIONS FOR ELECTRICAL The developers of the safety guide had conducted wind tunnel INSTALLATIONS IN CHEMICAL PLANTS. Although this pamphlet does tests to determine the extent of flammable vapors from the not specify requirements on tanker loading docks, it does discharge point. These tests provided several different classify certain areas as hazardous around similar operations conditions which included various discharge rates of the vapor, such as bulk, loading of tanker trucks, bulk loading of railway various heights of the discharge opening, the number of exhaust tank cars and areas around large storage tanks located adjacent vents and the effect of shipboard superstructures on the flow of to refineries. vapors. The extent of the flommable vapors from the discharge The main source of the hazard, obviously, is aboard ship and point was well delineated and gavb the Committee a very real and to be completely accurate, the extent of a hazardous area must practical guide in establishing the parameters of locations be delineated from the tanker vent. The Committee agreed that classified as hazardous. this would be impractical and unenforceable and so a study was The recommendations in the Oil Tanker and Terminal Safety made to determine the shortest distance from a ship vent to ship Guide are consistent with NFPA Pamphlet No. 497-1975, • side of the dock and how far the vapors would extend from that CLASSIFICATION OF CLASS I HAZARDOUS LOCATIONS FOR ELECTRICAL point was _determined by the results of the wind tunnel tests• INSTALLATIONS IN CHEMICAL PLANTS. Although this pamphlet does The proposed Code requirements are the results of this study. not specify requirements on tanker loading docks, it does With the tremendous increase in the handling of petroleum • classify certain areas as hazardous around similar operations products in the nations harbors, it is imperative that the NEC such as bulk loading of tanker trucks, bulk loading of railway be updated to provide for safe electrical- systems installed tank cars and areas around large storage tanks located adjacent adjacent to this extremely flammable material. to refineries. PANEL RECOMMENDATION: Reject. The main source of the hazard, obviously, is aboard ship and PANEL COMMENT: See Panel Comment on Proposal 85. to be completely accurate, the extent of a hazardous area must VOTE ONP~NEL RECOMMENDATION: be delineated from the tanker vent. The Committee agreed that AFFIRM#ITIVE: 15. this would be impractical and unenforceable and so a study was NEGATIVE: Joriman. made to determine the shortest distance from a ship vent to ship EXPLANATION OF VOTE: side of the dock and how far the vapors would extend from that JORIMAN: The IAEI concurred with the Task Force studies that point was determined by the results of the wind tunnel tests• the National Electrical Code requirements dealing with the The proposed Code requirements are the results of this study. installation of electrical wiring on tanker loading docks are With the tremendous increase in the handling of petroleum weak and inadequate. Therefore, Proposal No. 86 should not have products in the nations harbors, it. is imperative that the NEC been rejected. be updated to provide for safe electrical systems installed adjacent to this extremely flammable material. PANEL RECOMMENDATION: Reject• PANEL COMMENT: The scope of Article 515 and the classification 515-2: Accept CMP 14 of areas is based on NFPA 30, the Panel believes NFPA 30 should SUBMITTER: Edward C. Semmer, NFPA No. 30 S/C General Storage be revised before Article 515. rl~---~--C-omb. Liquids VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. PROPOSAL: 87 Delete Section 515-2(a) through (g) and replace w~-Tt-FF-Th-6 following: The following table shall be applied where Class I liquids are stored, handled or dispensed and shall be used to delineate and 515-1/and 515-2(h)-(New): Reject CMP 14 classify bulk storage plant areas for the purpose of electrical SUBMITTER: Southwestern Section IAEI equipment under normal'circumstances. It is based on the ~86 515-1 DEFINITIONS. Add the following to the premise that the installation meets all requirements of NFPA No. definition: 30. Should this not be the case, the inspector shall have the This designation shall also include locations where ships authority to determine the extent of the classified area. A carrying bulk cargos of gasoline or other volatile flammable classified area shall not extend beyond an unpierced wall, roof liquids are loaded or unloaded. or other solid partition. Add a Subparagraph to read: SUBSTANTIATION: NFPA No. 30 S/C General Storage and Handling of (h) Loading and Unloading of Tanker Ships. Flammable and Combustible Liquids has the basic responsibility I. The entire horizontal area of the loading dock and the. for classification of electrical areas in bulk plants. The horizontal area extending 35 feet in all directions from the present text in No. 70 is not in complete agreement with No. 30 tanker loading dock and continuing 15 feet inland measured from and thus presents a conflict. This conflict can be eliminated the mean high tide line shall be considered a Class 1 Division 2 by: location. The Class I Division 2 location shall also extend, (1) revision of the existing text in No. 70, or (2) by • vertically, below the dock to the water and upward to a level of dropping requirements contained in these articles and 100 feet above the surface of the loading dock. referencing No. 30, or (3) by incorporating the table contained Exception: The hazardous location shall ndt be required to . in No. 30 into 515-~ of No. 70. extend more than 18 inches above that portion of the. grade, dock Of the three approaches, number 3 is probably the most or romp which is more than 35 feet from the ship.side of the attractive since it elimin#tes the conflict and provides .loading dock. information to the inspector without the need for an additional 2. The Class 1 Division 2 location shall extend 25 feet in reference code. Updating as changes may be made in No. 30 is all directions from the surface of the loading hose manifold. not a significant problem since both codes are close in cycles. 3. The interior of a.building, any portion which is located There is a further advantage since the table proposed for in a Class 1 Division 2 location, shall be classified as a Class inclusion in No. 70 is more complete and covers classified areas I Division 2 location. not presently covered in No. 70. Exception: Buildings which are provided with satisfactory PANEL RECOMMENDATION: Accept as Revised: positive pressure ventilation, and safeguards, with air taken "The following Table shall be applied where Class I liquids from a clean air source may.be considered to be a non-hazardous are stored, handled or dispensed and shall be used to delineate location. and classify bulk storage plants. The'Class I location shall SUBSTANTIATION: Following an explosion aboard an oil tanker not extend beyond an unpierced wall, roof or other solid • which destroyed the ship at its dock in the Los Angeles City partition." harbor a Task Force was appointed to study the causes of another Incorporate Table 6-1 of NFPA 30 into Section 515-2 labeling such accident. The Task Force discovered that the Electrical it Table 515-2. (See attached editorial modiffcations to Table.) Code requirements dealing with the installation of electric VOTE ON PANEL RECOMMENDATION: wiring on tanker loading' docks were weak and inadequate (NOTE: AFFIRMATIVE: 15. L. A. City Code requirements for hazardous locations are the NEGATIVE: Adams. same as NEC), and accordingly appointed an ad-hoc Electrical COMMENT ON VOTE: Code Advisory Committee to study the problem and propose EWERS:. In the Panel Recommendation "Table 515-2" should be appropriate changes to the Los Angeles City Electrical Code.' substituted for "The following.table" to agree with Proposal No. A survey of National Cedes, standards or other publications 77. dealing with the handling of flammaWle liquids or gases revealed SCHRAM: I suggest "the following table" be revised to: that there are no existing standards for electrical systems "Table 515-2" to be consistent with Panel Action on Proposal No. which are located on tanker loading docks. One publication, The 77. National Oil Tanker and Terminal Safety Guide, did provide EXPLANATION OF VOTE: helpful background information which enabled the Committee to ADAMS: Some as comment on Proposal No. 77. develop valid, practical standards. The developers of the safety guide had conducted wind tunnel tests to determine the extent ef flammable vapors from the discharge point. These tests provided several different conditions which included various discharge rates of the vapor, various heights of the discharge opening, the number of exhaust vents and the effect of shipboard superstructures on the flow of vapors. The extent of the flammable vapors from the discharge 245 Table 515-2. Class I Locations -- Bulk Plants

Class I, Group D Location Division ~v1~Class I Location

\ TANK Vl~HICI..E~"~ AND TANK CAR~ Loading Through 1 Within 3 feet of edge of dome, Open Dome. extending in all directions. %' 2 ~etween 3 feet and 15 feet from I 'S'pace~ f edge of dome, extending in all directions.

Loading Through Bottom 1 Within 3 feet of point of venting to Connections With Atmo- atmosphere extending in all di- spheric Venting rections. 2 ~sd~r.between!3 feet and 15 feet from point of venting to atmosphere, extending in all directions. ALso up to 18 inches above grade within a horizontal radius of 10 feet from point of loading connection.

Loading Through Closed 1 Within 3 feet of open end of vent, Dome ' With Atmospheric extending in all directions. Venting 2 -¢~m[ between 3 feet and 15 feet from open end of vent, extending in aU directions. Also within 3 feet of edge of dome, extending in all directions.

Loading Through Closed Within ,3 feet of point of connection Dome With Vapor Recovery of both fill and vapor lines, extending in all directions.

/ Bottom Loading With Vapor Within 3 feet of point of connections Recovery or Any Bottom extending in all directions. Aho Unloading up to 18 inches above grade withi~ a horizontal radius of 10 feet from point of connection.

~e ace ' " nt o~, consideration shall be given to fact that tank [ cars or tank vehicles may be spotted at. varying points. Therefore, the ex- [trerm'ties of the loading or unloading positions shall be used.

L p

246 Table 515-2 - continued

Class I, Group D Location Division Cl ass I Location PUMPS, B r.v-~nl~s, WITHDRAWAL FITTINGSs METERS AND SIMILAR Dsvtc~s

Indoors 2 Within 5 feet of an~ edge of such devices, extending in all directions. Also up to 3 feet above floor or grade level within 25 feet horizontally from any edge of such devices. Outdoors Within 3 feet of any edge of such devices, extending in all directions. Also up to 18 inches .above grade level within 10 feet horizontally from any edge of such devices. STORAGE AND REPAIR GARAGE All pits or spaces below floor FOR TANK VEHICLES level. •4~'~up to 18 inches above floor F a ej or grade level for entire storage or repair garage. DRAINAGE DITCHES n u~~pto 18 inches above [SpaceJ SEPARATORS, IMPOUNDING ~tch, separator or basin. Also BASINS up to 18 inches above grade within 15 feet horizontally from any edge. GARAGES FOR OTHER THAN Ordinary If there is 'any opening to these TANK VEHICLES rooms within the extent of an outdoor ~' .... __" ..... the vision 1 or entire room shall be cl~sified , location, the same as the area classification at the point of the opening. //OUTDOOR .DRUM STORAGE Ordinary

INrOOR WAREHOUSING Ordinary I f there is any opening to these WHERE THERE Is No rooms within the extent of an FLAMMABLE LIQUID indoor ~'17he room Division 1 or 2J TRANSFER shall be classified the same as if the wall, curb or partition location, did not exist. OFFICE AND REST ROOMS Ordinary

247 1

Table 515-2 - continued

-- -- ....;:,,--'.2 /

Class I, Group D Location Divimon Cl ass I Location

DRUM AND CONT~ Fn~Lmo Outdoors, or Indoors Within 3 feet of vent and fill With Adequate Ventilation opening, extending in all directions. ~m~-between 3 feet and 5 feet from vent or fill opening, extending in all directions. Also up to 18 inches above floor or grade level within a horizontal radius of 10 feet from vent or flU opening.

TANK -- ABOVF.f.~OUND* Shell, Ends, or Roof 2 Within !0 feet from shell, ends, and Dike Area or roof of tank. ~ tnsme dikes to level of top of dike. Vent Within 5 feet of open end of vent, extending in all directions. .A,s~ between 5 feet and 10 feet from open end of vent, extending in all directions. Floating Roof 1 ~ve the roof and within the shell.

PITS Without Mechanical Entire wad ~ithin pit if any ~kspace Ventilation part is within a Division 1 or 2~ Cloca t i on -I With Mechanical 2 Entire ~within pit if any Ventilation part is within a Division 1 or 2 ~!~:~:~ ~--~=__ ocatio Containing Valves, Fit- Entire pit. tings or Piping, and Not __ Within a Division 1 or 2 -~-~,,~-~-~-r Loca t i on.

*For Tanks -- Underground, -,.-c -t ~ ~.~ ...... see Article 514-2.

248 515-5: Reject CMP 14 ARTICLE 516 -- FINISHING PROCESSES SUBMITTER: H. F. van der Voort, Cleveland, OH I~TOIR)-S'A-L-T.'88 In first sentence delete: "where buried under Article 516 (HOD 1978 NEC): Reject CMP 14 not less than 2 feet of earth, it shall be permitted in." After SUBMITTER: Chet Noyes, AIJen KnicKrehm second sentence add: "Refer to Section 300-5(a)." 94 ReviseArticle 616 as follows: SUBSTANTIATION: This reflects intent of Article 300-5(a), which ~evise scope (definition) by addiqg second sentence: permits buri~ depths of 18 inches and all the exceptions "This Article also covers electroplating and electrolytic thereto. finishing processes." PANEL RECOMMENDATION: Reject. (2) Make the present wording "Article 516 Part A-Liquid PANEL COMMENT: The present requirement is necessary because of Finish Processes." normal heavy vehicular traffic. (3) Make new "Part B-Electrolytic Finish Processes." VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. (4) Add: 516-xx. General. Equipment for use in electrolytic finishing process shall be of a type intended for such service. 516-xx. Branch-Circult Conductor. The branch-circuit conductor 515-5(a): Accept , CMP 14 supplying one or more units of equipment to a source of supply SUBMITTER: TSC~Approved for the Purpose shall have an ampacity of not less than 125 percent of the total 89 See the Technical Subcommittee "Reco~endations" connected load. un--6-de-r--~e definition of "Approved for the Purpose" in Article 516-xx. SecondaryWiring. The conductor connecting the I00. electrolite tank equipment to the regulating or conversion SUBSTANTIATION: See the TSC "findings" under the definition of equipment shall be permitted to run as open wiring not on "Approved for the Purpose" in Article 100. insulator, provided: PANEL RECOMMENDATION: Accept as Revised: (a) they are protected from physical damage; : ~-l-{n-e~ to "conduit or an approved cable." (b) they operate at 25 volts or less. 'V_OTE ON PANEL RECOMMENDATION: Unanimously Affirmative. 516-xx. Busbars. Open noninsulated busbaFs shall be permitted to be installed over or adjacent to electrolite containers, provided: (a) signs are posted to indicate open electric conductors are 515-5(a): Accept CMP 14 present; SUBMITTER: Idaho Chapter IAEI (b) the busbars occur only in the areas where electrical PROPOSAL: 90 In the 5th line of Section 515-5(a), after the connection is required. ~rpose," add the following senteh~e: "Where rigid 516-xx. Overcurrent Protection. Secondary and busbars shall be nonmetallic conduit is used, threaded rigid metal conduit or protected fgom overcurrent by one or more of the following: threaded steel intermediated metal conduit shall be used for the (a) fuses or circu!t breakers; last two feet of the conduit run to emergence or to the point of (b) a current sensing device which operates a disconnecting connection to the above ground ~aceway." The rest of the means section to remain unchanged. ' (c) an inherently current limiting equipment or apparatus SUBSTANTIATION: Section 515-5, as" it is now written, which by its design and construction, will limit overcurrent to misleadingl~ermits rigid nonmetallic conduit to emerge from 120% of normal--reduce output voltage--de-energize the secondary its minimum required buried depth of two feet by directly conductors if an overcurrent continues for a set length of time requiring cable to be enclosed in threaded rigid or threaded of not more than five seconds. steel intermediate conduit from point of lowest buried cable SUBSTANTIATION: The present NEC rules do not cover the level. electroplating industry. When inspectors apply the NEC rules PANEL RECOMMENDATION: Accept. open conductors necessary are not permitted. This, of course, VOTE ON PANEL RECOMMENDATION: Unanimously AFfirmative. cannot be permitted. This proposal is an attempt to correct this situation. See attached letter for further supporting comment. PANEL RECOMMENDATION: Reject. 515-5(a): Reject CMP 14 PANEL COMMENT: Outside the scope of CMP 14. SUBMITTER: Idaho Chapter IAEI VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. !~-O-gb-~-A-C-~.' 91 Add a sentence before the last sentence as Where rigid nonmetallic conduit is used, threaded rigid metal conduit or threaded steel intermediated metal condGit shall be 516-2(b)(5): Reject CMP 14 used for the last two feet of the conduit run to emergence or to Secretary's Note: It was the action of the Correlating the point of connection to the above ground raceway. Committee that further consideration be given to the comments SUBSTANTIATION: Section 515-5, as it ,is now written, expressed in Mr. Schram's voting. misleadingl~ermits rigid nonmetalIic conduit to emerge from SUBMITTER: Nicholas J. Talbot, NFPA Finishing Processes its minimum required buried depth of two feet by directly requiring cable to be enclosed in threaded rigid or threaded PROPOSAL: 95 Change20 feet horizontal dimension to 25 feet. steel intermediate conduit from point of lowest buried cable SUBSTANTIATION: Conflict with the intent of NFPA 34. level. Correction of Error. PANEL RECOMMENDATION: Reject. Figure 6-1 of NFPA 34-1974 indicates the dimension is 25 feet, PANEL COMMENT: See Panel action on Proposal No. 90. but the text of Section 6-2.4 of NFPA 34-1974 indicates the ~TE ON PANEL RECOMMENDATION: Unanimously Affirmative. dimension is 20 feet. The text of Section 516-2(b)(5) of the National Electrical Code is based on the text of NFPA 34-1974 rather than the dimension shown in the figure in NFPA 34-1974 (see Proposal No. 112 in the "Preprint" for the 1978 NEC). The 515-5(c): Reject CMP 14 text of Section 6-2.4 of NFPA 34 is now in the process of being SUBMITTER: Idaho Chapter IAEI corrected by the Finishing Processes Committee to agree with the 92 Delete "with a nonmetallic sheath" from the Figure 6-I. ~ine. After "cable" in the first line, add "approved for PANEL RECOMMENDATION: Reject. the purpose." It will then read: "Where rigid nonmetallic PANEL COMMENT: Pending final action on NFPA 34. conduit or'cable approved for the purpose is used.... " (Rest of VOTE ON PANEL RECOMMENDATION: Section to remain unchanged.) AFFIRMATIVE: 14. SUBSTANTIATION: The phrase "cable with a nonmetallic sheath" NEGATIVE: Conaway, Schram. can be misle~ing to include UF cable. EXPLANATION OF VOTE: PANEL RECOMMENDATION: Reject. CONAWAY: Correct distance to 2B ft. in 516-2(b)(5). There PANEL COMMENT: The present wording adequately reflects the should be no inconsistencies between NFPA 34 and NEC. Panel's intent. Figures i, 2, and 3 should also track NFPA 33. Figure 1 in VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. the NFC does not do this as powder coating that requires Class II installations is not covered. For that matter, Article 516 does not indicate that certain powder coating operations need Class II, Division 1 or Division 2 installations. 515-5(c): Reject CMP 14 SCHRAM: There were no comments on this Proposal during the SUBMITTER: IdahoChapter IAEI period of public review of revised NFPA No. 34 as noted in ~OSAL: 93 Revise as follows: TEC-79-F. I believe the Panel should have voted affirmative "Where rigid nommetallic conduit or cable approved for the with the same Panel Comment. purpose is used.... " (Rest of Section to remain unchanged.) SUBSTANTIATION: The phrase "cable with a nonmetallic sheath" Table 6-I Electrical Equipment Classified Areas--Bulk Plants can be misleading to include UF cable. PANEL RECOMMENDATION: Reject. TANK VEHICLE PANEL COMMENT: See Panel action on Proposal No. 92. AND TANK CAR* VOTE ON PANEL RECOMMENDATION: Unanimously Affirmative. Loading Through 1 Within 3 feet of edge of dome, Open Dome extending in all directions.

* Loading Through Bottom 249