496 Part 75—Mandatory Safety Standards

§ 74.18 30 CFR Ch. I (7–1–17 Edition)

(b) If a change is proposed in a pump 75.214 Supplemental support materials, unit of a certified CMDPSU or in elec- equipment and tools. trical components of a CPDM, the ap- 75.215 Longwall mining systems. 75.220 Roof control plan. proval of MSHA with respect to intrin- 75.221 Roof control plan information. sic safety shall be obtained in accord- 75.222 Roof control plan—approval criteria. ance with the procedures set forth in 75.223 Evaluation and revision of roof con- § 74.11(d). trol plan.

§ 74.18 Withdrawal of certification. Subpart D—Ventilation Any certificate of approval issued 75.300 Scope. under this part may be revoked for 75.301 Definitions. cause by NIOSH or MSHA which issued 75.302 Main mine fans. the certificate. 75.310 Installation of main mine fans. 75.311 Main mine fan operation. 75.312 Main mine fan examinations and PART 75—MANDATORY SAFETY records. STANDARDS—UNDERGROUND 75.313 Main mine fan stoppage with persons COAL MINES underground. 75.320 Air quality detectors and measurement devices. Subpart A—General 75.321 Air quality. Sec. 75.322 Harmful quantities of noxious gases. 75.1 Scope. 75.323 Actions for excessive methane. 75.2 Definitions. 75.324 Intentional changes in the ventilation system. Subpart B—Qualified and Certified Persons 75.325 Air quantity. 75.326 Mean entry air velocity. 75.100 Certified person. 75.327 Air courses and trolley haulage sys- 75.150 Tests for methane and for oxygen de- tems. ficiency; qualified person. 75.330 Face ventilation control devices. 75.151 Tests for methane; qualified person; 75.331 Auxiliary fans and tubing. additional requirement. 75.332 Working sections and working places. 75.152 Tests of air flow; qualified person. 75.333 Ventilation controls. 75.153 Electrical work; qualified person. 75.334 Worked-out areas and areas where 75.154 Repair of energized surface high volt- pillars are being recovered. age lines; qualified person. 75.335 Seal strengths, design applications, 75.155 Qualified hoisting engineer; qualifica- and installation. tions. 75.336 Sampling and monitoring require- 75.156 AMS operator, qualifications. ments. 75.159 Records of certified and qualified per- 75.337 Construction and repair of seals. sons. 75.338 Training. 75.160 Training programs. 75.339 Seals records. 75.161 Plans for training programs. 75.340 Underground electrical installations. 75.341 Direct-fired intake air heaters. Subpart C—Roof Support 75.342 Methane monitors. 75.343 Underground shops. 75.200 Scope. 75.344 Compressors. 75.201 Definitions. 75.350 Belt air course ventilation. 75.202 Protection from falls of roof, face and 75.351 Atmospheric monitoring systems. ribs. 75.352 Actions in response to AMS malfunc- 75.203 Mining methods. tion, alert, or alarm signals. 75.204 Roof bolting. 75.360 Preshift examination at fixed inter- 75.205 Installation of roof support using vals. mining machines with integral roof bolt- 75.361 Supplemental examination. ers. 75.362 On-shift examination. 75.206 Conventional roof support. 75.363 Hazardous conditions and violations 75.207 Pillar recovery. of mandatory health or safety standards; 75.208 Warning devices. posting, correcting, and recording. 75.209 Automated Temporary Roof Support 75.364 Weekly examination. (ATRS) systems. 75.370 Mine ventilation plan; submission 75.210 Manual installation of temporary and approval. support. 75.371 Mine ventilation plan; contents. 75.211 Roof testing and scaling. 75.372 Mine ventilation map. 75.212 Rehabilitation of areas with unsup- 75.373 Reopening mines. ported roof. 75.380 Escapeways; bituminous and lignite 75.213 Roof support removal. mines.

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75.381 Escapeways; anthracite mines. 75.511 Low-, medium-, or high-voltage dis- 75.382 Mechanical escape facilities. tribution circuits and equipment; repair. 75.384 Longwall and shortwall travelways. 75.511–1 Qualified person. 75.385 Opening new mines. 75.512 Electric equipment; examination, 75.386 Final mining of pillars. testing and maintenance. 75.388 Boreholes in advance of mining. 75.512–1 Qualified person. 75.389 Mining into inaccessible areas. 75.512–2 Frequency of examinations. 75.513 Electric conductor; capacity and in- Subpart E—Combustible Materials and sulation. Rock Dusting 75.513–1 Electric conductor; size. 75.514 Electrical connections or splices; 75.400 Accumulation of combustible mate- suitability. rials. 75.515 Cable fittings; suitability. 75.400–1 Definitions. 75.516 Power wires; support. 75.400–2 Cleanup program. 75.516–1 Installed insulators. 75.401 Abatement of dust; water or water 75.516–2 Communication wires and cables; with a wetting agent. installation; insulation; support. 75.401–1 Excessive amounts of dust. 75.517 Power wires and cables; insulation 75.402 Rock dusting. and protection. 75.402–1 Definition. 75.517–1 Power wires and cables; insulation 75.402–2 Exceptions. and protection. 75.403 Maintenance of incombustible con- 75.517–2 Plans for insulation of existing bare tent of rock dust. power wires and cables. 75.403–1 Incombustible content. 75.518 Electric equipment and circuits; over- 75.404 Exemption of anthracite mines. load and short circuit protection. 75.518–1 Electric equipment and circuits; Subpart F—Electrical Equipment—General overload and short circuit protection; minimum requirements. 75.500 Permissible electric equipment. 75.518–2 Incandescent lamps; overload and 75.500–1 Other low horsepower electric face short circuit protection. equipment. 75.519 Main power circuits; disconnecting 75.501 Permissible electric face equipment; switches. coal seams above water table. 75.501–1 Coal seams above the water table. 75.519–1 Main power circuits; disconnecting 75.501–2 Permissible electric face equip- switches; locations. ment. 75.520 Electric equipment; switches. 75.501–3 New openings; mines above water 75.521 Lightning arresters; ungrounded and table and never classed gassy. exposed power conductors and telephone 75.502 Permits for noncompliance. wires. 75.503 Permissible electric face equipment; 75.522 Lighting devices. maintenance. 75.522–1 Incandescent and fluorescent 75.503–1 Statement listing all electric face lamps. equipment. 75.523 Electric face equipment; 75.504 Permissibility of new, replacement, deenergization. used, reconditioned, additional, and re- 75.523–1 Deenergization of self-propelled built electric face equipment. electric face equipment installation re- 75.505 Mines classed gassy; use and mainte- quirements. nance of permissible electric face equip- 75.523–2 Deenergization of self-propelled ment. electric face equipment; performance re- 75.506 Electric face equipment; require- quirements. ments for permissibility. 75.523–3 Automatic emergency-parking 75.506–1 Electric face equipment; permis- brakes. sible condition; maintenance require- 75.524 Electric face equipment; electric ments. equipment used in return air outby the 75.507 Power connection points. last open crosscut; maximum level of al- 75.507–1 Electric equipment other than ternating or direct electric current be- power-connection points; outby the last tween frames of equipment. open crosscut; return air; permissibility APPENDIX A TO SUBPART F OF PART 75—LIST requirements. OF PERMISSABLE ELECTRIC FARE EQUIP- 75.508 Map of electrical system. MENT APPROVED BY THE BUREAU OF MINES 75.508–1 Mine tracks. PRIOR TO MAY 23, 1936 75.508–2 Changes in electric system map; recording. Subpart G—Trailing Cables 75.509 Electric power circuit and electric equipment; deenergization. 75.600 Trailing cables; flame resistance. 75.510 Energized trolley wires; repair. 75.600–1 Approved cables; flame resistance. 75.510–1 Repair of energized trolley wires; 75.601 Short circuit protection of trailing training. cables.

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75.601–1 Short circuit protection; ratings 75.705–5 Installation of protective equip- and settings of circuit breakers. ment. 75.601–2 Short circuit protection; use of 75.705–6 Protective clothing; use and inspec- fuses; approval by the Secretary. tion. 75.601–3 Short circuit protection; dual ele- 75.705–7 Protective equipment; inspection. ment fuses; current ratings; maximum 75.705–8 Protective equipment; testing and values. storage. 75.602 Trailing cable junctions. 75.705–9 Operating disconnecting or cutout 75.603 Temporary splice of trailing cable. switches. 75.604 Permanent splicing of trailing cables. 75.705–10 Tying into energized high-voltage 75.605 Clamping of trailing cables to equip- surface circuits. ment. 75.705–11 Use of grounded messenger wires; 75.606 Protection of trailing cables. ungrounded systems. 75.607 Breaking trailing cable and power 75.706 Deenergized underground power cir- cable connections. cuits; idle days—idle shifts.

Subpart H—Grounding Subpart I—Underground High-Voltage Distribution 75.700 Grounding metallic sheaths, armors and conduits enclosing power conductors. 75.800 High-voltage circuits; circuit break- 75.700–1 Approved methods of grounding. ers. 75.701 Grounding metallic frames, casings 75.800–1 Circuit breakers; location. and other enclosures of electric equip- 75.800–2 Approved circuit schemes. ment. 75.800–3 Testing, examination and mainte- 75.701–1 Approved methods of grounding of nance of circuit breakers; procedures. equipment receiving power from 75.800–4 Testing, examination, and mainte- ungrounded alternating current power nance of circuit breakers; record. systems. 75.801 Grounding resistors. 75.701–2 Approved method of grounding me- 75.802 Protection of high-voltage circuits tallic frames, casings and other enclo- extending underground. sures receiving power from single-phase 75.803 Fail safe ground check circuits on 110–220-volt circuit. high-voltage resistance grounded sys- 75.701–3 Approved methods of grounding me- tems. tallic frames, casings and other enclo- 75.803–1 Maximum voltage ground check cir- sures of electric equipment receiving cuits. power from direct current power systems 75.803–2 Ground check systems not employ- with one polarity grounded. ing pilot check wires; approval by the 75.701–4 Grounding wires; capacity of wires. Secretary. 75.701–5 Use of grounding connectors. 75.804 Underground high-voltage cables. 75.702 Protection other than grounding. 75.805 Couplers. 75.702–1 Protection other than grounding; 75.806 Connection of single-phase loads. approved by an authorized representative 75.807 Installation of high-voltage trans- of the Secretary. mission cables. 75.703 Grounding offtrack direct-current 75.808 Disconnecting devices. machines and enclosures of related de- 75.809 Identification of circuit breakers and tached components. disconnecting switches. 75.703–1 Approved method of grounding. 75.810 High-voltage trailing cables; splices. 75.703–2 Approved grounding mediums. 75.811 High-voltage underground equipment; 75.703–3 Approved methods of grounding off- grounding. track mobile, portable and stationary di- 75.812 Movement of high-voltage power cen- rect-current machines. ters and portable transformers; permit. 75.703–4 Other methods of protecting off- 75.812–1 Qualified person. track direct-current equipment; ap- 75.812–2 High-voltage power centers and proved by an authorized representative transformers; record of examination. of the Secretary. HIGH-VOLTAGE LONGWALLS 75.704 Grounding frames of stationary high- voltage equipment receiving power from 75.813 High-voltage longwalls; scope. ungrounded delta systems. 75.814 Electrical protection. 75.704–1 Approved methods of grounding. 75.815 Disconnect devices. 75.705 Work on high-voltage lines; deener- 75.816 Guarding of cables. gizing and grounding. 75.817 Cable handling and support systems. 75.705–1 Work on high-voltage lines. 75.818 Use of insulated cable handling equip- 75.705–2 Repairs to energized surface high- ment. voltage lines. 75.819 Motor-starter enclosures; barriers 75.705–3 Work on energized high-voltage sur- and interlocks. face lines; reporting. 75.820 Electrical work; troubleshooting and 75.705–4 Simultaneous repairs. testing.

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75.821 Testing, examination and mainte- 75.1003 Insulation of trolley wires, trolley nance. feeder wires and bare signal wires; guard- 75.822 Underground high-voltage longwall ing of trolley wires and trolley feeder cables. wires. 75.823 Scope. 75.1003–1 Other requirements for guarding of 75.824 Electrical protection. trolley wires and trolley feeder wires. 75.825 Power centers. 75.1003–2 Requirements for movement of off- 75.826 High-voltage trailing cables. track mining equipment in areas of ac- 75.827 Guarding of trailing cables. tive workings where energized trolley 75.828 Trailing cable pulling. wires or trolley feeder wires are present; 75.829 Tramming continuous mining ma- pre-movement requirements; certified chines in and out of the mine and from and qualified persons. section to section. 75.830 Splicing and repair of trailing cables. Subpart L—Fire Protection 75.831 Electrical work; troubleshooting and testing. 75.1100 Requirements. 75.832 Frequency of examinations; record- 75.1100–1 Type and quality of firefighting keeping. equipment. 75.833 Handling high-voltage trailing cables. 75.1100–2 Quantity and location of fire- 75.834 Training. fighting equipment. APPENDIX A TO SUBPART I OF PART 75—DIA- 75.1100–3 Condition and examination of fire- GRAMS OF INBY AND OUTBY SWITCHING fighting equipment. 75.1101 Deluge-type water sprays, foam gen- Subpart J—Underground Low- and Me- erators; main and secondary belt-con- dium-Voltage Alternating Current Cir- veyor drives. cuits 75.1101–1 Deluge-type water spray systems. 75.1101–2 Installation of deluge-type sprays. 75.900 Low- and medium-voltage circuits 75.1101–3 Water requirements. serving three-phase alternating current 75.1101–4 Branch lines. equipment; circuit breakers. 75.1101–5 Installation of foam generator sys- 75.900–1 Circuit breakers; location. tems. 75.900–2 Approved circuit schemes. 75.1101–6 Water sprinkler systems; general. 75.900–3 Testing, examination and mainte- 75.1101–7 Installation of water sprinkler sys- nance of circuit breakers; procedures. tems; requirements. 75.900–4 Testing, examination and mainte- 75.1101–8 Water sprinkler systems; arrange- nance of circuit breakers; record. ment of sprinklers. 75.901 Protection of low- and medium-volt- 75.1101–9 Back-up water system. age three-phase circuits used under- 75.1101–10 Water sprinkler systems; fire ground. warning devices at belt drives. 75.902 Low- and medium-voltage ground 75.1101–11 Inspection of water sprinkler sys- check monitor circuits. tems. 75.902–1 Maximum voltage ground check cir- 75.1101–12 Equivalent dry-pipe system. cuits. 75.1101–13 Dry powder chemical systems; 75.902–2 Approved ground check systems not general. employing pilot check wires. 75.1101–14 Installation of dry powder chem- 75.902–4 Attachment of ground conductors ical systems. and ground check wires to equipment 75.1101–15 Construction of dry powder chem- frames; use of separate connections. ical systems. 75.903 Disconnecting devices. 75.1101–16 Dry powder chemical systems; 75.904 Identification of circuit breakers. sensing and fire suppression devices. 75.905 Connection of single-phase loads. 75.1101–17 Sealing of dry powder chemical 75.906 Trailing cables for mobile equipment, systems. ground wires and ground check wires. 75.1101–18 Dry powder requirements. 75.907 Design of trailing cables for medium- 75.1101–19 Nozzles; flow rate and direction. voltage circuits. 75.1101–20 Safeguards for dry powder chem- APPENDIX A TO SUBPART J OF PART 75 ical systems. 75.1101–21 Back-up water system. Subpart K—Trolley Wires and Trolley Feeder 75.1101–22 Inspection of dry powder chemical Wires systems. 75.1102 Slippage and sequence switches. 75.1000 Cutout switches. 75.1103 Automatic fire warning devices. 75.1001 Overcurrent protection. 75.1103–1 Automatic fire sensors. 75.1001–1 Devices for overcurrent protection; 75.1103–2 Automatic fire sensors; approved testing and calibration requirements; components; installation requirements. records. 75.1103–3 Automatic fire sensor and warning 75.1002 Installation of electric equipment device systems; minimum requirements; and conductors; permissibility. general.

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75.1103–4 Automatic fire sensor and warning 75.1107–7 Water spray devices; capacity; device systems; installation; minimum water supply; minimum requirements. requirements. 75.1107–8 Fire suppression devices; 75.1103–5 Automatic fire warning devices; extinguishant supply systems. actions and response. 75.1107–9 Dry chemical devices; capacity; 75.1103–6 Automatic fire sensors; actuation minimum requirements. of fire suppression systems. 75.1107–10 High expansion foam devices; 75.1103–7 Electrical components; permissi- minimum capacity. bility requirements. 75.1107–11 Extinguishing agents; require- 75.1103–8 Automatic fire sensor and warning ments on mining equipment employed in device systems; examination and test re- low coal. quirements. 75.1107–12 Inerting of mine atmosphere pro- 75.1103–9 Minimum requirements; fire sup- hibited. pression materials and location; mainte- 75.1107–13 Approval of other fire suppression nance of entries and crosscuts; access devices. doors; communications; fire crews: high- 75.1107–14 Guards and handrails; require- expansion foam devices. ments where fire suppression devices are 75.1103–10 Fire suppression systems; addi- employed. tional requirements. 75.1107–15 Fire suppression devices; hazards; 75.1103–11 Tests of fire hydrants and fire training of miners. hose; record of tests. 75.1107–16 Inspection of fire suppression de- 75.1104 Underground storage, lubricating oil vices. and grease. 75.1107–17 Incorporation by reference; avail- 75.1106 Welding, cutting, or soldering with ability of publications. arc or flame underground. 75.1108 Approved conveyor belts. 75.1106–1 Test for methane. Subpart M—Maps TRANSPORTATION, HANDLING AND STORAGE OF LIQUEFIED AND NONLIQUEFIED COMPRESSED 75.1200 Mine map. GAS CYLINDERS 75.1200–1 Additional information on mine map. 75.1106–2 Transportation of liquefied and 75.1200–2 Accuracy and scale of mine maps. nonliquefied compressed gas cylinders; 75.1201 Certification. requirements. 75.1202 Temporary notations, revisions, and 75.1106–3 Storage of liquefied and nonlique- supplements. fied compressed gas cylinders; require- 75.1202–1 Temporary notations, revisions, ments. and supplements. 75.1106–4 Use of liquefied and nonliquefied 75.1203 Availability of mine map. compressed gas cylinders; general re- 75.1204 Mine closure; filing of map with Sec- quirements. retary. 75.1106–5 Maintenance and tests of liquefied 75.1204–1 Places to give notice and file and nonliquefied compressed gas cyl- maps. inders; accessories and equipment; requirements. Subpart N—Explosives and Blasting 75.1106–6 Exemption of small low pressure gas cylinders containing nonflammable 75.1300 Definitions. or nonexplosive gas mixtures. 75.1301 Qualified person. 75.1310 Explosives and blasting equipment. FIRE SUPPRESSION DEVICES AND FIRE-RESIST- 75.1311 Transporting explosives and deto- ANT HYDRAULIC FLUIDS ON UNDERGROUND nators. EQUIPMENT 75.1312 Explosives and detonators in under- 75.1107 Fire suppression devices. ground magazines. 75.1107–1 Fire-resistant hydraulic fluids and 75.1313 Explosives and detonators outside of fire suppression devices on underground magazines. equipment. 75.1314 Sheathed explosive units. 75.1107–2 Approved fire-resistant hydraulic 75.1315 Boreholes for explosives. fluids; minimum requirements. 75.1316 Preparation before blasting. 75.1107–3 Fire suppression devices; approved 75.1317 Primer cartridges. components; installation requirements. 75.1318 Loading boreholes. 75.1107–4 Automatic fire sensors and manual 75.1319 Weight of explosives permitted in actuators; installation; minimum re- boreholes in bituminous and lignite quirements. mines. 75.1107–5 Electrical components of fire sup- 75.1320 Multiple-shot blasting. pression devices; permissibility require- 75.1321 Permit for firing more than 20 ments. boreholes and to use nonpermissible 75.1107–6 Capacity of fire suppression de- blasting units. vices; location and direction of nozzles. 75.1322 Stemming boreholes.

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75.1323 Blasting circuits. 75.1504 Mine emergency evacuation training 75.1324 Methane concentration and tests. and drills. 75.1325 Firing procedure. 75.1505 Escapeway maps. 75.1326 Examination after blasting. 75.1506 Refuge alternatives. 75.1327 Misfires. 75.1507 Emergency Response Plan; refuge al- 75.1328 Damaged or deteriorated explosives ternatives. and detonators. 75.1508 Training and records for examination, maintenance and repair of refuge Subpart O—Hoisting and Mantrips alternatives and components.

75.1400 Hoisting equipment; general. Subpart Q—Communications 75.1400–1 Hoists; brakes, capability. 75.1400–2 Hoists; tests of safety catches; 75.1600 Communications. records. 75.1600–1 Communication facilities; main 75.1400–3 Daily examination of hoisting portals; installation requirements. equipment. 75.1600–2 Communication facilities; working 75.1400–4 Certifications and records of daily sections; installation and maintenance examinations. requirements; audible or visual alarms. 75.1401 Hoists; rated capacities; indicators. 75.1600–3 Communications facilities; refuge 75.1401–1 Hoists; indicators. alternatives. 75.1402 Communication between shaft stations and hoist room. Subpart R—Miscellaneous 75.1402–1 Communication between shaft stations and hoist room. 75.1700 Oil and gas wells. 75.1402–2 Tests of signaling systems. 75.1702 Smoking; prohibition. 75.1403 Other safeguards. 75.1702–1 Smoking programs. 75.1403–1 General criteria. 75.1703 Portable electric lamps. 75.1403–2 Criteria—Hoists transporting ma- 75.1703–1 Permissible lamps. terials; brakes. 75.1707–1 New working section. 75.1403–3 Criteria—Drum clutch; cage con- 75.1708 Surface structures, fireproofing. struction. 75.1708–1 Surface structures; fireproof con- 75.1403–4 Criteria—Automatic elevators. struction. 75.1403–5 Criteria—Belt conveyors. 75.1709 Accumulations of methane and coal 75.1403–6 Criteria—Self-propelled personnel dust on surface coal-handling facilities. carriers. 75.1710 Canopies or cabs; diesel-powered and 75.1403–7 Criteria—Mantrips. electric face equipment. 75.1403–8 Criteria—Track haulage roads. 75.1710–1 Canopies or cabs; self-propelled 75.1403–9 Criteria—Shelter holes. diesel-powered and electric face equip- 75.1403–10 Criteria—Haulage; general. ment; installation requirements. 75.1403–11 Criteria—Entrances to shafts and 75.1711 Sealing of mines. slopes. 75.1711–1 Sealing of shaft openings. 75.1404 Automatic brakes; speed reduction 75.1711–2 Sealing of slope or drift openings. gear. 75.1711–3 Openings of active mines. 75.1404–1 Braking system. 75.1712 Bath houses and toilet facilities. 75.1405 Automatic couplers. 75.1712–1 Availability of surface bathing fa- 75.1405–1 Automatic couplers, haulage cilities; change rooms; and sanitary fa- equipment. cilities. 75.1712–2 Location of surface facilities. WIRE ROPES 75.1712–3 Minimum requirements of surface 75.1429 Guide ropes. bathing facilities, change rooms, and 75.1430 Wire ropes; scope. sanitary toilet facilities. 75.1431 Minimum rope strength. 75.1712–4 Waiver of surface facilities re- 75.1432 Initial measurement. quirements. 75.1433 Examinations. 75.1712–5 Application for waiver of surface 75.1434 Retirement criteria. facilities. 75.1435 Load end attachments. 75.1712–6 Underground sanitary facilities; 75.1436 Drum end attachment. installation and maintenance. 75.1437 End attachment retermination. 75.1712–7 Underground sanitary facilities; 75.1438 End attachment replacement. waiver of requirements. 75.1712–8 Application for waiver of location Subpart P—Mine Emergencies requirements for underground sanitary facilities. 75.1500 [Reserved] 75.1712–9 Issuance of waivers. 75.1501 Emergency evacuations. 75.1712–10 Underground sanitary facilities; 75.1502 Mine emergency evacuation and fire- maintenance. fighting program of instruction. 75.1713 Emergency medical assistance; first- 75.1503 Use of fire suppression equipment. aid.

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75.1713–1 Arrangements for emergency med- 75.1726 Performing work from a raised posi- ical assistance and transportation for in- tion; safeguards. jured persons; agreements; reporting re- 75.1727 Drive belts. quirements; posting requirements. 75.1728 Power-driven pulleys. 75.1713–2 Emergency communications; re- 75.1729 Welding operations. quirements. 75.1730 Compressed air; general; compressed 75.1713–3 First-Aid training; supervisory air systems. employees. 75.1731 Maintenance of belt conveyors and 75.1713–4 First-aid training program; avail- belt conveyor entries. ability of instruction to all miners. 75.1732 Proximity detection systems. 75.1713–5 First-aid training program; retraining of supervisory employees; avail- Subpart S [Reserved] ability to all miners. 75.1713–6 First-aid training program; min- Subpart T—Diesel-Powered Equipment imum requirements. 75.1713–7 First-aid equipment; location; 75.1900 Definitions. minimum requirements. 75.1901 Diesel fuel requirements. 75.1714 Availability of approved self-rescue 75.1902 Underground diesel fuel storage— devices; instruction in use and location. general requirements. 75.1714–1 Approved self-rescue devices. 75.1903 Underground diesel fuel storage fa- 75.1714–2 Self-rescue devices; use and loca- cilities and areas; construction and safe- tion requirements. ty precautions. 75.1714–3 Self-rescue devices; inspection, 75.1904 Underground diesel fuel tanks and testing, maintenance, repair, and record- safety cans. keeping. 75.1905 Dispensing of diesel fuel. 75.1714–4 Additional self-contained self-res- 75.1905–1 Diesel fuel piping systems. cuers (SCSRs). 75.1906 Transport of diesel fuel. 75.1714–5 Map locations of self-contained 75.1907 Diesel-powered equipment intended self-rescuers (SCSR). for use in underground coal mines. 75.1714–6 Emergency tethers. 75.1908 Nonpermissible diesel-powered 75.1714–7 Multi-gas detectors. equipment; categories. 75.1714–8 Reporting SCSR inventory and 75.1909 Nonpermissible diesel-powered malfunctions; retention of SCSRs. equipment; design and performance re- 75.1715 Identification check system. quirements. 75.1716 Operations under water. 75.1910 Nonpermissible diesel-powered 75.1716–1 Operations under water; notifica- equipment; electrical system design and tion by operator. performance requirements. 75.1716–2 Permit required. 75.1911 Fire suppression systems for diesel- 75.1716–3 Applications for permits. powered equipment and diesel fuel trans- 75.1716–4 Issuance of permits. portation units. 75.1717 Exemptions. 75.1912 Fire suppression systems for perma- 75.1718 Drinking water. nent underground diesel fuel storage fa- 75.1718–1 Drinking water; quality. cilities. 75.1719 Illumination; purpose and scope of 75.1913 Starting aids. §§ 75.1719 through 75.1719–4; time for com- 75.1914 Maintenance of diesel-powered pliance. equipment. 75.1719–1 Illumination in working places. 75.1915 Training and qualification of persons 75.1719–2 Lighting fixtures; requirements. working on diesel-powered equipment. 75.1719–3 Methods of measurement; light 75.1916 Operation of diesel-powered equip- measuring instruments. ment. 75.1719–4 Mining machines, cap lamps; requirements. AUTHORITY: 30 U.S.C. 811, 813(h), 957. 75.1720 Protective clothing; requirements. SOURCE: 35 FR 17890, Nov. 20, 1970, unless 75.1720–1 Distinctively colored hard hats, or otherwise noted. hard caps; identification for newly employed, inexperienced miners. EDITORIAL NOTE: The provisions of this 75.1721 Opening of new underground coal part marked [Statutory Provision] appear in mines, or reopening and reactivating of Title III of the Federal Coal Mine Health and abandoned or deactivated coal mines; no- Safety Act of 1969. tification by the operator; requirements. 75.1722 Mechanical equipment guards. Subpart A—General 75.1723 Stationary grinding machines; protective devices. § 75.1 Scope. 75.1724 Hand-held power tools; safety devices. This part 75 sets forth safety stand- 75.1725 Machinery and equipment; operation ards compliance with which is manda- and maintenance. tory in each underground coal mine

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subject to the Federal Mine Safety and from underground mines and which Health Act of 1977. Some standards also provides at least 1 hour of protection are applicable to surface operations. against carbon monoxide. Regulations and criteria supple- Ground fault or grounded phase. An mentary to these standards also are set unintentional connection between an forth in this part. electric circuit and the grounding sys- [35 FR 17890, Nov. 20, 1970, as amended at 43 tem. FR 12319, Mar. 24, 1978] Low voltage. Up to and including 660 volts, medium voltage means voltages § 75.2 Definitions. from 661 to 1,000 volts; and high voltage The following definitions apply in means more than 1,000 volts. this part. Motor-starter enclosure. An enclosure Act. The Federal Mine Safety and containing motor starting circuits and Health Act of 1977. equipment. Active workings. Any place in a coal Nominal voltage. The phase-to-phase mine where miners are normally re- or line-to-line root-mean-square value quired to work or travel. assigned to a circuit or system for des- Adequate interrupting capacity. The ability of an electrical protective de- ignation of its voltage class, such as vice, based upon its required and in- 480 or 4,160 volts. Actual voltage at tended application, to safely interrupt which the circuit or system operates values of current in excess of its trip may vary from the nominal voltage setting or melting point. within a range that permits satisfac- Anthracite. Coals with a volatile ratio tory operation of equipment. equal to 0.12 or less. The volatile ratio Permissible. (1) As applied to electric is the volatile matter content divided face equipment, all electrically oper- by the volatile matter plus the fixed ated equipment taken into or used inby carbon. the last open crosscut of an entry or a Approval documentation. Formal pa- room of any coal mine the electrical pers issued by the Mine Safety and parts of which, including, but not lim- Health Administration which describe ited to, associated electrical equip- and illustrate the complete assembly ment, components, and accessories, are of electrical machinery or accessories designed, constructed, and installed, in which have met the applicable require- accordance with the specifications of ments of 30 CFR part 18. the Secretary, to assure that such Certified or registered. As applied to equipment will not cause a mine explo- any person, a person certified or reg- sion or mine fire, and the other fea- istered by the State in which the coal tures of which are designed and con- mine is located to perform duties pre- structed, in accordance with the speci- scribed by this part 75, except that in a fications of the Secretary, to prevent, State where no program of certifi- to the greatest extent possible, other cation or registration is provided or accidents in the use of such equipment. where the program does not meet at least minimum Federal standards es- The regulations of the Secretary or the tablished by the Secretary, such cer- Director of the Bureau of Mines in ef- tification or registration shall be by fect on March 30, 1970, relating to the the Secretary. requirements for investigation, testing, Circuit-interrupting device. A device approval, certification, and acceptance designed to open and close a circuit by of such equipment as permissible shall nonautomatic means and to open the continue in effect until modified or su- circuit automatically at a predeter- perseded by the Secretary, except that mined overcurrent value without dam- the Secretary shall provide procedures, age to the device when operated within including, where feasible, testing, ap- its rating. proval, certification, and acceptance in Coal mine. Includes areas of adjoining the field by an authorized representa- mines connected underground. tive of the Secretary, to facilitate com- Filter Self-Rescuer (FSR). A type of gas pliance by an operator with the re- mask approved by MSHA and NIOSH quirements of § 75.500 within the peri- under 42 CFR part 84 for escape only ods prescribed in § 75.500.

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(2) As applied to equipment other Secretary. The Secretary of Labor or than permissible electric face equip- the Secretary’s delegate. ment: (i) Equipment used in the oper- Self-Contained Self-Rescuer (SCSR). A ation of a coal mine to which an ap- type of closed-circuit, self-contained proval plate, label, or other device is breathing apparatus approved by attached as authorized by the Sec- MSHA and NIOSH under 42 CFR part 84 retary and which meets specifications for escape only from underground which are prescribed by the Secretary mines. for the construction and maintenance Short circuit. An abnormal connection of such equipment and are designed to of relatively low impedance, whether assure that such equipment will not made accidentally or intentionally, because a mine explosion or a mine fire. tween two points of different potential. (ii) The manner of use of equipment Working face. Any place in a coal means the manner of use prescribed by mine in which work of extracting coal the Secretary. from its natural deposit in the earth is Qualified person. As the context re- performed during the mining cycle. quires: Working place. The area of a coal (1) An individual deemed qualified by mine inby the last open crosscut. the Secretary and designated by the Working section. All areas of the coal operator to make tests and examina- mine from the loading point of the sections required by this part 75; and tion to and including the working (2) An individual deemed, in accord- faces. ance with minimum requirements to be [57 FR 20913, May 15, 1992, as amended at 60 established by the Secretary, qualified FR 30401, June 8, 1995; 67 FR 11001, Mar. 11, by training, education, and experience, 2002] to perform electrical work, to maintain electrical equipment, and to con- Subpart B—Qualified and Certified duct examinations and tests of all elec- Persons trical equipment. Respirable dust. Dust collected with a § 75.100 Certified person. sampling device approved by the Sec- (a) The provisions of Subpart D— retary and the Secretary of Health and Ventilation of this part 75 require that Human Services in accordance with certain examinations and tests be part 74—Coal Mine Dust Personal Sam- made by a certified person. A certified pler Units of this title. Sampling de- person within the meaning of those vice approvals issued by the Secretary provisions is a person who has been of the Interior and Secretary of Health, certified as a mine foreman (mine man- Education, and Welfare are continued ager), an assistant mine foreman (sec- in effect. tion foreman), or a preshift examiner Rock dust. Pulverized limestone, do- (mine examiner). A person who has lomite, gypsum, anhydrite, shale, been so certified is also a qualified per- adobe, or other inert material, pref- son within the meaning of those provi- erably light colored, 100 percent of sions of subpart D of this part which which will pass through a sieve having require that certain tests be made by a 20 meshes per linear inch and 70 per- qualified person and within the mean- cent or more of which will pass ing of § 75.1106. through a sieve having 200 meshes per (b) A person who is certified as a linear inch; the particles of which when mine foreman, an assistant mine fore- wetted and dried will not cohere to man, or a preshift examiner by the form a cake which will not be dispersed State in which the coal mine is located into separate particles by a light blast is, to the extent of the State’s certifi- of air; and which does not contain more cation, a certified person within the than 5 percent combustible matter or meaning of the provisions of subpart D more than a total of 4 percent free and of this part and § 75.1106 referred to in combined silica (SiO2), or, where the paragraph (a) of this section. Secretary finds that such silica con- (c)(1) The Secretary may certify per- centrations are not available, which sons in the categories of mine foreman, does not contain more than 5 percent assistant mine foreman, and preshift of free and combined silica. examiner whenever the State in which

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persons are presently employed in (2) The Secretary may qualify per- these categories does not provide for sons for this purpose in a coal mine in such certification. A person’s initial which persons are not qualified for this certification by MSHA is valid for as purpose by the State upon an applica- long as the person continues to satisfy tion and a satisfactory showing by the the requirements necessary to obtain operator of the coal mine that each the certification and is employed at such person has been trained and des- the same coal mine or by the same ignated by the operator to test for independent contractor. The mine op- methane and oxygen deficiency and has erator or independent contractor shall made such tests for a period of 6 make an application which satisfac- months immediately preceding the ap- torily shows that each such person has plication. Applications for Secretarial had at least 2 years underground expe- qualification should be submitted to rience in a coal mine, and has held the the Health and Safety Activity, Mine position of mine foreman, assistant Safety and Health Administration, Cer- mine foreman, or preshift examiner for tification and Qualification Center, a period of 6 months immediately pre- P.O. Box 25367, Denver Federal Center, ceding the filing of the application, and Denver, Colo. 80225. is qualified to test for methane and for [35 FR 17890, Nov. 20, 1970, as amended at 43 oxygen deficiency. Applications for FR 12320, Mar. 24, 1978] Secretarial certification should be submitted in writing to the Health and § 75.151 Tests for methane; qualified Safety Activity, Mine Safety and person; additional requirement. Health Administration, Certification Notwithstanding the provisions of and Qualification Center, P.O. Box § 75.150, on and after January 1, 1971, no 25367, Denver Federal Center, Denver, person shall be a qualified person for Colorado 80225. testing for methane unless he dem- (2) A person certified by the Sec- onstrates to the satisfaction of an au- retary under this paragraph will be a thorized representative of the Sec- certified person, within the meaning of retary that he is qualified to test for the provisions for subpart D of this methane with a portable methane de- part and § 75.1106 referred to in para- tector approved by the Bureau of Mines graph (a) of this section, as long as or the Mine Safety and Health Admin- that person continues to satisfy the re- istration under part 22 of this chapter quirements for qualification or certifi- (Bureau of Mines Schedule 8C). cation and is employed at the same coal mine or by the same independent § 75.152 Tests of air flow; qualified person. contractor. A person is a qualified person within [35 FR 17890, Nov. 20, 1970, as amended at 43 the meaning of the provisions of Sub- FR 12320, Mar. 24, 1978; 54 FR 30514, July 20, part D—Ventilation of this part requir- 1989] ing that tests of air flow be made by a qualified person only if he is a certified § 75.150 Tests for methane and for oxygen deficiency; qualified person. person under § 75.100 or a person trained and designated by a certified person to (a) The provisions of Subpart D— perform such tests. Ventilation of this part and § 75.1106 require that tests for methane and for § 75.153 Electrical work; qualified per- oxygen deficiency be made by a quali- son. fied person. A person is a qualified per- (a) Except as provided in paragraph son for this purpose if he is a certified (f) of this section, an individual is a person under § 75.100. qualified person within the meaning of (b) Pending issuance of Federal §§ 75.511 and 75.512 to perform electrical standards, a person will be considered a work (other than work on energized qualified person for testing for meth- surface high-voltage lines) if: ane and for oxygen deficiency: (1) He has been qualified as a coal (1) If he has been qualified for this mine electrician by a State that has a purpose by the State in which the coal coal mine electrical qualification pro- mine is located; or gram approved by the Secretary; or,

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(2) He has at least 1 year of experi- than 5 percentage points for such prac- ence in performing electrical work un- tical experience. derground in a coal mine, in the sur- (e) An individual may, within 30 days face work areas of an underground coal from the date on which he received no- mine, in a surface coal mine, in a tification from the Administration of noncoal mine, in the mine equipment his test scores, repeat those on which manufacturing industry, or in any he received an unsatisfactory score. If other industry using or manufacturing further retesting is necessary after this similar equipment, and has satisfac- initial repetition, a minimum of 30 torily completed a coal mine electrical days from the date of receipt of notifi- training program approved by the Sec- cation of the initial retest scores shall retary; or, elapse prior to such further retesting. (3) He has at least 1 year of experi- (f) An individual who has, prior to ence, prior to the date of the applica- November 1, 1972, been qualified to per- tion required by paragraph (c) of this form electrical work specified in section, in performing electrical work §§ 75.511 and 75.512 (other than work on underground in a coal mine, in the sur- energized surface high-voltage lines) face work areas of an underground coal shall continue to be qualified until mine, in a surface coal mine, in a June 30, 1973. To remain qualified after noncoal mine, in the mine equipment June 30, 1973, such individual shall manufacturing industry, or in any meet the requirements of either para- other industry using or manufacturing graph (a) (1), (2), or (3) of this section. similar equipment, and he attains a (g) An individual qualified in accord- satisfactory grade on each of the series ance with this section shall, in order to of five written tests approved by the retain qualification, certify annually Secretary and prescribed in paragraph to the District Manager, that he has (b) of this section. satisfactorily completed a coal mine (b) The series of five written tests ap- electrical retraining program approved proved by the Secretary shall include by the Secretary. the following categories: [37 FR 22376, Oct. 19, 1972, as amended at 44 (1) Direct current theory and applica- FR 9380, Feb. 13, 1979; 47 FR 23641, May 28, tion; 1982] (2) Alternating current theory and application; § 75.154 Repair of energized surface (3) Electric equipment and circuits; high voltage lines; qualified person. (4) Permissibility of electric equip- An individual is a qualified person ment; and, within the meaning of § 75.705 for the (5) Requirements of subparts F purpose of repairing energized surface through K of this part 75. high voltage lines only if he has had at (c) In order to take the series of five least 2 years experience in electrical written tests approved by the Sec- maintenance, and at least 2 years expe- retary, an individual shall apply to the rience in the repair of energized high District Manager and shall certify that voltage surface lines located on poles he meets the requirements of para- or structures. graph (a)(3) of this section. The tests will be administered in the Coal Mine § 75.155 Qualified hoisting engineer; Safety and Health Districts at regular qualifications. intervals, or as demand requires. (a)(1) A person is a qualified hoisting (d) A score of at least 80 percent of engineer within the provisions of sub- each of the five written tests will be part O of this part, for the purpose of deemed to be a satisfactory grade. Rec- operating a steam-driven hoist in a ognition shall be given to practical ex- coal mine, if he has at least 1 year experience in that 1 percentage point perience as an engineer in a steam- shall be added to an individual’s score driven hoisting plant and is qualified in each test for each additional year of by the State in which the mine is lo- experience beyond the 1 year minimum cated as a steam-hoisting engineer; or requirement specified in paragraph (2) If a State has no program for (a)(3) of this section; however, in no qualifying persons as steam-hoisting case shall an individual be given more engineers, the Secretary may qualify

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persons for this purpose if the operator ator is employed in accordance with of the coal mine in which such persons the mine operator’s approved Part 48 are employed, or the independent con- training plan. tractor, makes an application and a (b) An AMS operator must be able to satisfactory showing that each such demonstrate to an authorized rep- person has had 1 year experience in op- resentative of the Secretary that he/ erating steam-driven hoists and has she is qualified to perform in the as- held the position of hoisting engineer signed position. for a periond of 6 months immediately [73 FR 80612, Dec. 31, 2008] preceding the application. A person’s qualification is valid for as long as this § 75.159 Records of certified and quali- person continues to satisfy the require- fied persons. ments necessary for qualification and The operator of each coal mine shall is employed at the same coal mine or maintain a list of all certified and by the same independent contractor. qualified persons designated to perform (b)(1) A person is a qualified hoisting duties under this part 75. engineer within the provisions of subpart O of this part, for the purpose of [35 FR 17890, Nov. 20, 1970, as amended at 60 operating an electrically driven hoist FR 33723, June 29, 1995] in a coal mine, if he has at least 1 year experience operating a hoist plant in a § 75.160 Training programs. mine or maintaining electric-hoist [STATUTORY PROVISION] equipment in a mine and is qualified by the State in which the mine is located Every operator of a coal mine shall provide as an electric-hoisting engineer; or a program, approved by the Secretary, of (2) If a State has no program for training and retraining of both qualified and qualifying persons as electric-hoisting certified persons needed to carry out functions prescribed in the Act. engineers, the Secretary may qualify persons for this purpose if the operator § 75.161 Plans for training programs. of the coal mine in which such persons Each operator must submit to the are employed, or the independent con- district manager, of the Coal Mine tractor, makes an application and a Safety and Health District in which satisfactory showing that each such the mine is located, a program or plan person has had 1 year experience in op- setting forth what, when, how, and erating electric-driven hoists and has where the operator will train and re- held the position of hoisting engineer train persons whose work assignments for a period of 6 months immediately require that they be certified or quali- preceding the application. A person’s fied. The program must provide— qualification is valid for as long as this (a) For certified persons, annual person continues to satisfy the require- training courses in first aid, principles ments for qualification and is em- of mine rescue, and the provisions of ployed at the same coal mine or by the this part 75; and same independent contractor. (b) For qualified persons, annual (c) Applications for Secretarial quali- courses in performance of the task fication should be submitted to the which they perform as qualified per- Health and Safety Activity, Mine Safe- sons. ty and Health Administration, Certifi- cation and Qualification Center, P.O. [63 FR 53761, Oct. 6, 1998] Box 25367, Denver Federal Center, Den- ver, Colo. 80225. Subpart C—Roof Support [35 FR 17894, Nov. 20, 1970, as amended at 43 FR 12320, Mar. 24, 1978; 54 FR 30515, July 20, SOURCE: 53 FR 2375, Jan. 27, 1988, unless 1989] otherwise noted.

§ 75.156 AMS operator, qualifications. § 75.200 Scope. (a) To be qualified as an AMS oper- This subpart C sets forth require- ator, a person shall be provided with ments for controlling roof, face and task training on duties and responsibil- ribs, including coal or rock bursts, in ities at each mine where an AMS oper- underground coal mines. Roof control

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systems installed prior to the effective Specification for Roof and Rock Bolts date of this subpart are not affected so and Accessories,’’ the mine operator long as the support system continues shall— to effectively control the roof, face and (1) Obtain a manufacturer’s certifi- ribs. cation that the material was manufactured and tested in accordance with § 75.201 Definitions. the specifications of ASTM F432–95; Automated temporary roof support and (ATRS) system. A device to provide tem- (2) Make this certification available porary roof support from a location to an authorized representative of the where the equipment operator is pro- Secretary and to the representative of tected from roof falls. miners. Any reduction in pil- Pillar recovery. (b) Roof bolts and accessories not ad- lar size during retreat mining. dressed in ASTM F432–95 may be used, § 75.202 Protection from falls of roof, provided that the use of such materials face and ribs. is approved by the District Manager (a) The roof, face and ribs of areas based on— where persons work or travel shall be (1) Demonstrations which show that supported or otherwise controlled to the materials have successfully sup- protect persons from hazards related to ported the roof in an area of a coal falls of the roof, face or ribs and coal or mine with similar strata, opening di- rock bursts. mensions and roof stresses; or (b) No person shall work or travel (2) Tests which show the materials to under unsupported roof unless in ac- be effective for supporting the roof in cordance with this subpart. an area of the affected mine which has similar strata, opening dimensions and § 75.203 Mining methods. roof stresses as the area where the roof (a) The method of mining shall not bolts are to be used. During the test expose any person to hazards caused by process, access to the test area shall be excessive widths of rooms, crosscuts limited to persons necessary to con- and entries, or faulty pillar recovery duct the test. methods. Pillar dimensions shall be (c)(1) A bearing plate shall be firmly compatible with effective control of installed with each roof bolt. the roof, face and ribs and coal or rock (2) Bearing plates used directly bursts. against the mine roof shall be at least (b) A sightline or other method of di- 6 inches square or the equivalent, ex- rectional control shall be used to main- cept that where the mine roof is firm tain the projected direction of mining and not susceptible to sloughing, bear- in entries, rooms, crosscuts and pillar ing plates 5 inches square or the equiv- splits. alent may be used. (c) A sidecut shall be started only (3) Bearing plates used with wood or from an area that is supported in ac- metal materials shall be at least 4 cordance with the roof control plan. inches square or the equivalent. (d) A working face shall not be mined through into an unsupported area of (4) Wooden materials that are used active workings, except when the un- between a bearing plate and the mine supported area is inaccessible. roof in areas which will exist for three (e) Additional roof support shall be years or more shall be treated to mini- installed where— mize deterioration. (1) The width of the opening specified (d) When washers are used with roof in the roof control plan is exceeded by bolts, the washers shall conform to the more than 12 inches; and shape of the roof bolt head and bearing (2) The distance over which the ex- plate. cessive width exists is more than 5 feet. (e)(1) The diameter of finishing bits shall be within a tolerance of plus or § 75.204 Roof bolting. minus 0.030 inch of the manufacturer’s (a) For roof bolts and accessories ad- recommended hole diameter for the an- dressed in ASTM F432–95, ‘‘Standard chor used.

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(2) When separate finishing bits are (6) The mine operator or a person used, they shall be distinguishable designated by the operator shall certify from other bits. by signature and date that measure- (f) Tensioned roof bolts. (1) Roof bolts ments required by paragraph (f)(5) of that provide support by creating a this section have been made. This cer- beam of laminated strata shall be at tification shall be maintained for at least 30 inches long. Roof bolts that least one year and shall be made avail- provide support by suspending the roof able to an authorized representative of from overlying stronger strata shall be the Secretary and representatives of long enough to anchor at least 12 the miners. inches into the stronger strata. (7) Tensioned roof bolts installed in (2) Test holes, spaced at intervals the roof support pattern shall not be specified in the roof control plan, shall used to anchor trailing cables or used be drilled to a depth of at least 12 for any other purpose that could affect inches above the anchorage horizon of the tension of the bolt. Hanging trail- mechanically anchored tensioned bolts ing cables, line brattice, telephone being used. When a test hole indicates lines, or other similar devices which do that bolts would not anchor in com- not place sudden loads on the bolts are petent strata, corrective action shall permitted. be taken. (8) Angle compensating devices shall (3) The installed torque or tension be used to compensate for the angle ranges for roof bolts as specified in the when tensioned roof bolts are installed roof control plan shall maintain the integrity of the support system and shall at angles greater than 5 degrees from not exceed the yield point of the roof the perpendicular to the bearing plate. bolt nor anchorage capacity of the (g) Non-tensioned grouted roof bolts. strata. The first non-tensioned grouted roof (4) In each roof bolting cycle, the ac- bolt installed during each roof bolting tual torque or tension of the first ten- cycle shall be tested during or imme- sioned roof bolt installed with each diately after the first row of bolts has drill head shall be measured imme- been installed. If the bolt tested does diately after it is installed. Thereafter, not withstand at least 150 foot-pounds for each drill head used, at least one of torque without rotating in the hole, roof bolt out of every four installed corrective action shall be taken. shall be measured for actual torque or [53 FR 2375, Jan. 27, 1988, as amended at 55 tension. If the torque or tension of any FR 4595, Feb. 8, 1990; 63 FR 20030, Apr. 22, of the roof bolts measured is not within 1998] the range specified in the roof control plan, corrective action shall be taken. § 75.205 Installation of roof support (5) In working places from which coal using mining machines with inte- is produced during any portion of a 24- gral roof bolters. hour period, the actual torque or ten- When roof bolts are installed by a sion on at least one out of every ten continuous mining machine with previously installed mechanically an- intregal roof bolting equipment: chored tensioned roof bolts shall be (a) The distance between roof bolts measured from the outby corner of the shall not exceed 10 feet crosswise. last open crosscut to the face in each advancing section. Corrective action (b) Roof bolts to be installed 9 feet or shall be taken if the majority of the more apart shall be installed with a bolts measured— wooden crossbar at least 3 inches thick (i) Do not maintain at least 70 per- and 8 inches wide, or material which cent of the minimum torque or tension provides equivalent support. specified in the roof control plan, 50 (c) Roof bolts to be installed more percent if the roof bolt plates bear than 8 feet but less than 9 feet apart against wood; or shall be installed with a wooden plank (ii) Have exceeded the maximum at least 2 inches thick and 8 inches specified torque or tension by 50 per- wide, or material which provides equiv- cent. alent support.

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§ 75.206 Conventional roof support. (c) A cluster of two or more posts (a) Except in anthracite mines using that provide equivalent strength may non-mechanized mining systems, when be used to meet the requirements of conventional roof support materials paragraph (b)(1) of this section, except are used as the only means of support— that no post shall have a diameter less (1) The width of any opening shall than 4 inches or have a cross-sectional not exceed 20 feet; area less than 13 square inches. (2) The spacing of roadway roof sup- (d) Materials other than wood used port shall not exceed 5 feet; for support shall have support strength (3)(i) Supports shall be installed to at least equivalent to wooden material within 5 feet of the uncut face; meeting the applicable provisions of (ii) When supports nearest the face this section. must be removed to facilitate the oper- (e) Posts and jacks shall be tightly ation of face equipment, equivalent installed on solid footing. temporary support shall be installed (f) When posts are installed under prior to removing the supports; roof susceptible to sloughing a cap (4) Straight roadways shall not ex- block, plank, crossbar or materials ceed 16 feet wide where full overhead that are equally effective shall be support is used and 14 feet wide where placed between the post and the roof. only posts are used; (g) Blocks used for lagging between (5) Curved roadways shall not exceed the roof and crossbars shall be spaced 16 feet wide; and to distribute the load. (6) The roof at the entrance of all (h) Jacks used for roof support shall openings along travelways which are be used with at least 36 square inches no longer needed for storing supplies or of roof bearing surface. for travel of equipment shall be sup- [53 FR 2375, Jan. 27, 1988, as amended at 55 ported by extending the line of support FR 14228, Apr. 16, 1990; 55 FR 20137, May 15, across the opening. 1990] (b) Conventional roof support materials shall meet the following specifica- § 75.207 Pillar recovery. tions: Pillar recovery shall be conducted in (1) The minimum diameter of cross- the following manner, unless otherwise sectional area of wooden posts shall be specified in the roof control plan: as follows: (a) Full and partial pillar recovery shall not be conducted on the same pil- Cross-sec- lar line, except where physical condi- Diameter of tional area of Post length (in inches) round posts split posts (in tions such as unstable floor or roof, (in inches) square falls of roof, oil and gas well barriers or inches) surface subsidence require that pillars 60 or less ...... 4 13 be left in place. Over 60 to 84 ...... 5 20 (b) Before mining is started in a pil- Over 84 to 108 ...... 6 28 Over 108 to 132 ...... 7 39 lar split or lift— Over 132 to 156 ...... 8 50 (1) At least two rows of breaker posts Over 156 to 180 ...... 9 64 or equivalent support shall be in- Over 180 to 204 ...... 10 79 Over 204 to 228 ...... 11 95 stalled— Over 228 ...... 12 113 (i) As close to the initial intended breakline as practicable; and (2) Wooden materials used for support (ii) Across each opening leading into shall have the following dimensions: an area where full or partial pillar ex- (i) Cap blocks and footings shall have traction has been completed. flat sides and be at least 2 inches thick, (2) A row of roadside-radius (turn) 4 inches wide and 12 inches long. posts or equivalent support shall be in- (ii) Crossbars shall have a minimum stalled leading into the split or lift. cross-sectional area of 24 square inches (c) Before mining is started on a final and be at least 3 inches thick. stump— (iii) Planks shall be at least 6 inches (1) At least 2 rows of posts or equiva- wide and 1 inch thick. lent support shall be installed on not (3) Cribbing materials shall have at more than 4-foot centers on each side least two parallel flat sides. of the roadway; and

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(2) Only one open roadway, which (1) Mining conditions or cir- shall not exceed 16 feet wide, shall lead cumstances prevent the use of an from solid pillars to the final stump of ATRS system; or a pillar. Where posts are used as the (2) Temporary supports are installed sole means of roof support, the width of in conjunction with an ATRS system. the roadway shall not exceed 14 feet. (d) Persons shall work or travel be- (d) During open-end pillar extraction, tween the support device of the ATRS at least 2 rows of breaker posts or system and another support, and the equivalent support shall be installed on distance between the support device of not more than 4-foot centers. These the ATRS system and support to the supports shall be installed between the left, right or beyond the ATRS system, lift to be started and the area where shall not exceed 5 feet. pillars have been extracted. These sup- (e) Each ATRS system shall meet ports shall be maintained to within 7 each of the following: feet of the face and the width of the (1) The ATRS system shall elas- roadway shall not exceed 16 feet. Where tically support a deadweight load posts are used as the sole means of roof measured in pounds of at least 450 support, the width of the roadway shall times each square foot of roof intended not exceed 14 feet. to be supported, but in no case less than 11,250 pounds. § 75.208 Warning devices. (2) The controls that position and set Except during the installation of roof the ATRS system shall be— supports, the end of permanent roof (i) Operable from under permanently support shall be posted with a readily supported roof; or visible warning, or a physical barrier (ii) Located in a compartment, which shall be installed to impede travel be- includes a deck, that provides the yond permanent support. equipment operator with overhead and lateral protection, and has the struc- § 75.209 Automated Temporary Roof tural capacity to elastically support a Support (ATRS) systems. deadweight load of at least 18,000 (a) Except in anthracite mines and as pounds. specified in paragraphs (b) and (c) of (3) All jacks affecting the capacity of this section, an ATRS system shall be the ATRS system and compartment used with roof bolting machines and shall have check valves or equivalent continuous-mining machines with inte- devices that will prevent rapid collapse gral roof bolters operated in a working in the event of a system failure. section. The requirements of this para- (4) Except for the main tram con- graph shall be met according to the fol- trols, tram controls for positioning the lowing schedule: equipment to set the ATRS system (1) All new machines ordered after shall limit the speed of the equipment March 28, 1988. to a maximum of 80 feet-per-minute. (2) All existing machines operated in (f) The support capacity of each mining heights of 36 inches or more ATRS system and the structural capac- after March 28, 1989; and ity of each compartment shall be cer- (3) All existing machines operated in tified by a registered engineer as meet- mining heights of 30 inches or more but ing the applicable requirements of less than 36 inches after March 28, 1990. paragraphs (e)(1) and (e)(2) of this sec- (b) After March 28, 1990 the use of tion. The certifications shall be made ATRS systems with existing roof bolt- available to an authorized representa- ing machines and continuous-mining tive of the Secretary and representa- machines with integral roof bolters op- tive of the miners. erated in a working section where the mining height is less than 30 inches § 75.210 Manual installation of tem- shall be addressed in the roof control porary support. plan. (a) When manually installing tem- (c) Alternative means of temporary porary support, only persons engaged support shall be used, as specified in in installing the support shall proceed the roof control plan, when— beyond permanent support.

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(b) When manually installing tem- removal of loose material from a posi- porary supports, the first temporary tion that will not expose the person support shall be set no more than 5 feet performing this work to injury from from a permanent roof support and the falling material. rib. All temporary supports shall be set so that the person installing the sup- § 75.212 Rehabilitation of areas with ports remains between the temporary unsupported roof. support being set and two other sup- (a) Before rehabilitating each area ports which shall be no more than 5 where a roof fall has occurred or the feet from the support being installed. roof has been removed by mining ma- Each temporary support shall be com- chines or by blasting— pletely installed prior to installing the (1) The mine operator shall establish next temporary support. the clean up and support procedures (c) All temporary supports shall be that will be followed; placed on no more than 5-foot centers. (2) All persons assigned to perform (d) Once temporary supports have rehabilitation work shall be instructed been installed, work or travel beyond in the clean-up and support procedures; permanent roof support shall be done and between temporary supports and the (3) Ineffective, damaged or missing nearest permanent support or between roof support at the edge of the area to other temporary supports. be rehabilitated shall be replaced or § 75.211 Roof testing and scaling. other equivalent support installed. (b) All persons who perform rehabili- (a) A visual examination of the roof, tation work shall be experienced in face and ribs shall be made imme- this work or they shall be supervised diately before any work is started in an by a person experienced in rehabilita- area and thereafter as conditions war- tion work who is designated by the rant. mine operator. (b) Where the mining height permits (c) Where work is not being per- and the visual examination does not formed to rehabilitate an area in ac- disclose a hazardous condition, sound tive workings where a roof fall has oc- and vibration roof tests, or other curred or the roof has been removed by equivalent tests, shall be made where mining machines or by blasting, each supports are to be installed. When entrance to the area shall be supported sound and vibration tests are made, by at least one row of posts on not they shall be conducted— more than 5-foot centers, or equally ef- (1) After the ATRS system is set fective support. against the roof and before other support is installed; or § 75.213 Roof support removal. (2) Prior to manually installing a roof support. This test shall begin (a)(1) All persons who perform the under supported roof and progress no work of removing permanent roof sup- further than the location where the ports shall be supervised by a manage- next support is to be installed. ment person experienced in removing (c) When a hazardous roof, face, or roof supports. rib condition is detected, the condition (2) Only persons with at least one shall be corrected before there is any year of underground mining experience other work or travel in the affected shall perform permanent roof support area. If the affected area is left unat- removal work. tended, each entrance to the area shall (b) Prior to the removal of perma- be posted with a readily visible warn- nent roof supports, the person super- ing, or a physical barrier shall be in- vising roof support removal in accord- stalled to impede travel into the area. ance with paragraph (a)(1) of this sec- (d) A bar for taking down loose mate- tion shall examine the roof conditions rial shall be available in the working in the area where the supports are to place or on all face equipment except be removed and designate each support haulage equipment. Bars provided for to be removed. taking down loose material shall be of (c)(1) Except as provided in paragraph a length and design that will allow the (g) of this section, prior to the removal

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of permanent supports, a row of tem- § 75.214 Supplemental support mate- porary supports on no more than 5-foot rials, equipment and tools. centers or equivalent support shall be (a) A supply of supplementary roof installed across the opening within 4 support materials and the tools and feet of the supports being removed. Ad- equipment necessary to install the ma- ditional supports shall be installed terials shall be available at a readily where necessary to assure safe re- accessible location on each working moval. section or within four crosscuts of each (2) Prior to the removal of roof bolts, working section. temporary support shall be installed as (b) The quantity of support materials close as practicable to each roof bolt and tools and equipment maintained being removed. available in accordance with this sec- (d) Temporary supports installed in tion shall be sufficient to support the accordance with this section shall not roof if adverse roof conditions are en- be removed unless— countered, or in the event of an acci- (1) Removal is done by persons who dent involving a fall. are in a remote location under supported roof; and § 75.215 Longwall mining systems. (2) At least two rows of temporary For each longwall mining section, supports, set across the opening on no the roof control plan shall specify— more than 5-foot centers, are main- (a) The methods that will be used to tained between the miners and the un- maintain a safe travelway out of the supported area. section through the tailgate side of the (e) Each entrance to an area where longwall; and supports have been removed shall be (b) The procedures that will be fol- posted with a readily visible warning lowed if a ground failure prevents trav- or a physical barrier shall be installed el out of the section through the tail- to impede travel into the area. gate side of the longwall. (f) Except as provided in paragraph (g) of this section, permanent support § 75.220 Roof control plan. shall not be removed where— (a)(1) Each mine operator shall de- (1) Roof bolt torque or tension meas- velop and follow a roof control plan, urements or the condition of conven- approved by the District Manager, that tional support indicate excessive load- is suitable to the prevailing geological ing; conditions, and the mining system to (2) Roof fractures are present; be used at the mine. Additional meas- (3) There is any other indication that ures shall be taken to protect persons the roof is structurally weak; or if unusual hazards are encountered. (4) Pillar recovery has been con- (2) The proposed roof control plan ducted. and any revisions to the plan shall be (g) Permanent supports may be re- submitted, in writing, to the District moved provided that: Manager. When revisions to a roof con- (1) Removal is done by persons who trol plan are proposed, only the revised are in a remote location under sup- pages need to be submitted unless oth- ported roof; and erwise specified by the District Man- (2) At least two rows of temporary ager. (b)(1) The mine operator will be noti- supports, set across the opening on no fied in writing of the approval or denial more than 5-foot centers, are main- of approval of a proposed roof control tained between the miners and the un- plan or proposed revision. supported area. (2) When approval of a proposed plan (h) The provisions of this section do or revision is denied, the deficiencies of not apply to removal of conventional the plan or revision and recommended supports for starting crosscuts and pil- changes will be specified and the mine lar splits or lifts except that prior to operator will be afforded an oppor- the removal of these supports an exam- tunity to discuss the deficiencies and ination of the roof conditions shall be changes with the District Manager. made. (3) Before new support materials, de- [55 FR 4595, Feb. 8, 1990] vices or systems other than roof bolts

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and accessories, are used as the only (9) A list of all support materials re- means of roof support, the District quired to be used in the roof, face and Manager may require that their effec- rib control system, including, if roof tiveness be demonstrated by experi- bolts are to be installed— mental installations. (i) The length, diameter, grade and (c) No proposed roof control plan or type of anchorage unit to be used; revision to a roof control plan shall be (ii) The drill hole size to be used; and implemented before it is approved. (iii) The installed torque or tension (d) Before implementing an approved range for tensioned roof bolts. revision to a roof control plan, all per- (10) When mechanically anchored sons who are affected by the revision tensioned roof bolts are used, the inter- shall be instructed in its provisions. vals at which test holes will be drilled. (e) The approved roof control plan (11) A description of the method of and any revisions shall be available to protecting persons— the miners and representative of min- (i) From falling material at drift ers at the mine. openings; and [53 FR 2375, Jan. 27, 1988; 53 FR 11395, Apr. 6, (ii) When mining approaches within 1988, as amended at 60 FR 33723, June 29, 1995; 150 feet of an outcrop. 71 FR 16668, Apr. 3, 2006] (12) A description of the roof and rib support necessary for the refuge alter- § 75.221 Roof control plan information. natives. (a) The following information shall (b) Each drawing submitted with a be included in each roof control plan: roof control plan shall contain a legend (1) The name and address of the com- explaining all symbols used and shall pany. specify the scale of the drawing which (2) The name, address, mine identi- shall not be less than 5 feet to the inch fication number and location of the or more than 20 feet to the inch. mine. (c) All roof control plan information, (3) The name and title of the com- including drawings, shall be submitted pany official responsible for the plan. on 81⁄2 by 11 inch paper, or paper folded (4) A typical columnar section of the to this size. mine strata which shall— [53 FR 2375, Jan. 27, 1988, as amended at 60 (i) Show the name and the thickness FR 33723, June 29, 1995; 73 FR 80697, Dec. 31, of the coalbed to be mined and any per- 2008] sistent partings; (ii) Identify the type and show the § 75.222 Roof control plan-approval thickness of each stratum up to and in- criteria. cluding the main roof above the coal- (a) This section sets forth the cri- bed and for distance of at least 10 feet teria that shall be considered on a below the coalbed; and mine-by-mine basis in the formulation (iii) Indicate the maximum cover and approval of roof control plans and over the area to be mined. revisions. Additional measures may be (5) A description and drawings of the required in plans by the District Man- sequence of installation and spacing of ager. Roof control plans that do not supports for each method of mining conform to the applicable criteria in used. this section may be approved by the (6) When an ATRS system is used, District Manager, provided that effec- the maximum distance that an ATRS tive control of the roof, face and ribs system is to be set beyond the last row can be maintained. of permanent support. (b) Roof Bolting. (1) Roof bolts should (7) When tunnel liners or arches are be installed on centers not exceeding 5 to be used for roof support, specifica- feet lengthwise and crosswise, except tions and installation procedures for as specified in § 75.205. the liners or arches. (2) When tensioned roof bolts are (8) Drawings indicating the planned used as a means of roof support, the width of openings, size of pillars, meth- torque or tension range should be capa- od of pillar recovery, and the sequence ble of supporting roof bolt loads of at of mining pillars. least 50 percent of either the yield

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point of the bolt or anchorage capacity (f) ATRS systems in working sections of the strata, whichever is less. where the mining height is below 30 (3) Any opening that is more than 20 inches. In working sections where the feet wide should be supported by a mining height is below 30 inches, an combination of roof bolts and conven- ATRS system should be used to the ex- tional supports. tent practicable during the installation (4) In any opening more than 20 feet of roof bolts with roof bolting ma- wide— chines and continuous-mining ma- (i) Posts should be installed to limit chines with integral roof bolters. each roadway to 16 feet wide where (g) Longwall mining systems. (1) Sys- straight and 18 feet wide where curved; tematic supplemental support should and be installed throughout— (ii) A row of posts should be set for (i) The tailgate entry of the first each 5 feet of space between the road- longwall panel prior to any mining; way posts and the ribs. and (5) Openings should not be more than (ii) In the proposed tailgate entry of 30 feet wide. each subsequent panel in advance of (c) Installation of roof support using the frontal abutment stresses of the mining machines with integral roof bolt- panel being mined. ers. (1) Before an intersection or pillar (2) When a ground failure prevents split is started, roof bolts should be in- travel out of the section through the stalled on at least 5-foot centers where tailgate side of the longwall section, the work is performed. the roof control plan should address— (2) Where the roof is supported by (i) Notification of miners that the only two roof bolts crosswise, openings travelway is blocked; should not be more than 16 feet wide. (ii) Re-instruction of miners regard- (d) Pillar recovery. (1) During developing escapeways and escape procedures ment, any dimension of a pillar should in the event of an emergency; be at least 20 feet. (iii) Re-instruction of miners on the (2) Pillar splits and lifts should not availability and use of self-contained be more than 20 feet wide. self-rescue devices; (3) Breaker posts should be installed (iv) Monitoring and evaluation of the on not more than 4-foot centers. air entering the longwall section; (4) Roadside-radius (turn) posts, or (v) Location and effectiveness of the equivalent support, should be installed two-way communication systems; and on not more than 4-foot centers leading (vi) A means of transportation from into each pillar split or lift. the section to the main line. (5) Before full pillar recovery is start- (3) The plan provisions addressed by ed in areas where roof bolts are used as paragraph (g)(2) of this section should the only means of roof support and remain in effect until a travelway is re- openings are more than 16 feet wide, at established on the tailgate side of a least one row of posts should be in- longwall section. stalled to limit the roadway width to 16 feet. These posts should be— § 75.223 Evaluation and revision of (i) Extended from the entrance to the roof control plan. split through the intersection outby (a) Revisions of the roof control plan the pillar in which the split or lift is shall be proposed by the operator— being made; and (1) When conditions indicate that the (ii) Spaced on not more than 5-foot plan is not suitable for controlling the centers. roof, face, ribs, or coal or rock bursts; (e) Unsupported openings at intersec- or tions. Openings that create an intersec- (2) When accident and injury experi- tion should be permanently supported ence at the mine indicates the plan is or at least one row of temporary sup- inadequate. The accident and injury ports should be installed on not more experience at each mine shall be re- than 5-foot centers across the opening viewed at least every six months. before any other work or travel in the (b) Each unplanned roof fall and rib intersection. fall and coal or rock burst that occurs

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in the active workings shall be plotted by § 75.1501 when an emergency evacu- on a mine map if it— ation is necessary. (1) Is above the anchorage zone where Atmospheric Monitoring System (AMS). roof bolts are used; A network consisting of hardware and (2) Impairs ventilation; software meeting the requirements of (3) Impedes passage of persons; §§ 75.351 and 75.1103–2 and capable of: (4) Causes miners to be withdrawn measuring atmospheric parameters; from the area affected; or transmitting the measurements to a (5) Disrupts regular mining activities designated surface location; providing for more than one hour. alert and alarm signals; processing and (c) The mine map on which roof falls cataloging atmospheric data; and, pro- are plotted shall be available at the viding reports. Early-warning fire de- mine site for inspection by authorized tection systems using newer tech- representatives of the Secretary and nology that provides equal or greater representatives of miners at the mine. protection, as determined by the Sec- (d) The roof control plan for each retary, will be considered atmospheric mine shall be reviewed every six monitoring systems for the purposes of months by an authorized representa- this subpart. tive of the Secretary. This review shall Belt air course. The entry in which a take into consideration any falls of the belt is located and any adjacent roof, face and ribs and the adequacy of entry(ies) not separated from the belt the support systems used at the time. entry by permanent ventilation controls, including any entries in series [53 FR 2375, Jan. 27, 1988; 60 FR 33723, June 29, with the belt entry, terminating at a 1995] return regulator, a section loading point, or the surface. Subpart D—Ventilation Carbon monoxide ambient level. The average concentration in parts per mil- AUTHORITY: 30 U.S.C. 811, 863. lion (ppm) of carbon monoxide detected in an air course containing carbon SOURCE: 61 FR 9829, Mar. 11, 1996, unless monoxide sensors. This average con- otherwise noted. centration is representative of the § 75.300 Scope. composition of the mine atmosphere over a period of mining activity during This subpart sets requirements for non-fire conditions. Separate ambient underground coal mine ventilation. levels may be established for different areas of the mine. § 75.301 Definitions. Incombustible. Incapable of being In addition to the applicable defini- burned. tions in § 75.2, the following definitions Intake air. Air that has not yet venti- apply in this subpart. lated the last working place on any Air course. An entry or a set of en- split of any working section, or any tries separated from other entries by worked-out area, whether pillared or stoppings, overcasts, other ventilation nonpillared. control devices, or by solid blocks of Intrinsically safe. Incapable of releas- coal or rock so that any mixing of air ing enough electrical or thermal en- currents between each is limited to ergy under normal or abnormal condi- leakage. tions to cause ignition of a flammable AMS operator. The person(s), des- mixture of methane or natural gas and ignated by the mine operator, who is air of the most easily ignitable com- located on the surface of the mine and position. monitors the malfunction, alert, and Noncombustible structure or area. De- alarm signals of the AMS and notifies scribes a structure or area that will appropriate personnel of these signals. continue to provide protection against Appropriate personnel. The person or flame spread for at least 1 hour when persons designated by the operator to subjected to a fire test incorporating perform specific tasks in response to an ASTM E119–88 time/temperature AMS signals. Appropriate personnel in- heat input, or equivalent. The publica- clude the responsible person(s) required tion ASTM E119–88 ‘‘Standard Test

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Methods for Fire Tests of Building Con- accordance with 5 U.S.C. 552(a) and 1 struction and Materials’’ is incor- CFR part 51. porated by reference and may be in- Point feeding. The process of pro- spected at any MSHA Coal Mine Safety viding additional intake air to the belt and Health District Office, or at air course from another intake air MSHA’s Office of Standards, Regula- course through a regulator. tions, and Variances, 201 12th Street Return air. Air that has ventilated South, Arlington, VA 22202–5452; 202– the last working place on any split of 693–9440; or at the National Archives any working section or any worked-out and Records Administration (NARA). area whether pillared or nonpillared. If For information on the availability of air mixes with air that has ventilated this material at NARA, call 202–741– the last working place on any split of 6030, or go to: http://www.archives.gov/ any working section or any worked-out area, whether pillared or nonpillared, federallregister/ it is considered return air. For the pur- codeloflfederallregulations/ poses of § 75.507–1, air that has been ibrllocations.html. In addition, copies used to ventilate any working place in of the document can be purchased from a coal producing section or pillared the American Society for Testing and area, or air that has been used to venti- Materials (ASTM), 100 Barr Harbor late any working face if such air is di- Drive, P.O. Box C700, West rected away from the immediate return Conshohocken, PA 19428–2959; 610–832– is return air. Notwithstanding the defi- 9500; http://www.astm.org. This incorpo- nition of intake air, for the purpose of ration by reference was approved by ventilation of structures, areas or in- the Director of the Federal Register in stallations that are required by this accordance with 5 U.S.C. 552(a) and 1 subpart D to be ventilated to return air CFR part 51. courses, and for ventilation of seals, Noncombustible material. Describes a other air courses may be designated as material that, when used to construct return air courses by the operator only a ventilation control, results in a con- when the air in these air courses will trol that will continue to serve its in- not be used to ventilate working places tended function for 1 hour when sub- or other locations, structures, installa- jected to a fire test incorporating an tions or areas required to be ventilated ASTM E119–88 time/temperature heat with intake air. input, or equivalent. The publication Worked-out area. An area where min- ASTM E119–88 ‘‘Standard Test Methods ing has been completed, whether for Fire Tests of Building Construction pillared or nonpillared, excluding de- and Materials’’ is incorporated by ref- veloping entries, return air courses, erence and may be inspected at any and intake air courses. Coal Mine Safety and Health District [61 FR 9829, Mar. 11, 1996; 61 FR 29288, June Office, or at MSHA’s Office of Stand- 10, 1996, as amended at 67 FR 38386, June 4, ards, Regulations, and Variances, 201 2002; 69 FR 17526, Apr. 2, 2004; 71 FR 16668, 12th Street South, Arlington, VA 22202– Apr. 3, 2006; 80 FR 52990, Sept. 2, 2015] 5452; 202–693–9440; or at the National Ar- chives and Records Administration § 75.302 Main mine fans. (NARA). For information on the avail- Each coal mine shall be ventilated by ability of this material at NARA, call one or more main mine fans. Booster 202–741–6030, or go to: http:// fans shall not be installed underground www.archives.gov/federallregister/ to assist main mine fans except in an- codeloflfederallregulations/ thracite mines. In anthracite mines, ibrllocations.html. In addition, copies booster fans installed in the main air of the document can be purchased from current or a split of the main air cur- the American Society for Testing and rent may be used provided their use is Materials (ASTM), 100 Barr Harbor approved in the ventilation plan. Drive, P.O. Box C700, West Conshohocken, PA 19428–2959; 610–832– § 75.310 Installation of main mine fans. 9500; http://www.astm.org. This incorpo- (a) Each main mine fan shall be— ration by reference was approved by (1) Installed on the surface in an in- the Director of the Federal Register in combustible housing;

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(2) Connected to the mine opening operate from a power circuit inde- with incombustible air ducts; pendent of all mine power circuits. (3) Equipped with an automatic de- (2) If an internal combustion engine vice that gives a signal at the mine is used to drive a main mine fan— when the fan either slows or stops. A (i) The fuel supply shall be protected responsible person designated by the against fires and explosions; operator shall always be at a surface (ii) The engine shall be installed in location at the mine where the signal an incombustible housing and be can be seen or heard while anyone is equipped with a remote shut-down de- underground. This person shall be pro- vice; vided with two-way communication (iii) The engine and the engine ex- with the working sections and work haust system shall be located out of di- stations where persons are routinely rect line of the air current exhausting assigned to work for the majority of a from the mine; and shift; (iv) The engine exhaust shall be vent- (4) Equipped with a pressure recorded to the atmosphere so that the ex- ing device or system. Mines permitted haust gases do not contaminate the to shut down main mine fans under mine intake air current or any enclo- § 75.311 and which do not have a pressure. sure recording device installed on main (c) If a main mine fan monitoring mine fans shall have until June 10, 1997 system is used under § 75.312, the sys- to install a pressure recording device tem shall— or system on all main mine fans. If a (1) Record, as described in paragraph device or system other than a circular (a)(4) the mine ventilating pressure; pressure recorder is used to monitor (2) Monitor bearing temperature, rev- main mine fan pressure, the moni- olutions per minute, vibration, electric toring device or system shall provide a voltage, and amperage; continuous graph or continuous chart (3) Provide a printout of the mon- of the pressure as a function of time. itored parameters, including the mine At not more than 7-day intervals, a ventilating pressure within a reason- hard copy of the continuous graph or able period, not to exceed the end of chart shall be generated or the record the next scheduled shift during which of the fan pressure shall be stored elec- miners are underground; and tronically. When records of fan pres- (4) Be equipped with an automatic de- sure are stored electronically, the sys- vice that signals when— tem used to store these records shall be (i) An electrical or mechanical defi- secure and not susceptible to alter- ciency exists in the monitoring system; ation and shall be capable of storing or the required data. Records of the fan (ii) A sudden increase or loss in mine pressure shall be retained at a surface ventilating pressure occurs. location at the mine for at least 1 year (5) Provide monitoring, records, and be made available for inspection by printouts, and signals required by para- authorized representatives of the Sec- graphs (c)(1) through (c)(4) at a surface retary and the representative of min- location at the mine where a respon- ers; sible person designated by the operator (5) Protected by one or more weak is always on duty and where signals walls or explosion doors, or a combina- from the monitoring system can be tion of weak walls and explosion doors, seen or heard while anyone is under- located in direct line with possible ex- ground. This person shall be provided plosive forces; with two-way communication with the (6) Except as provided under para- working sections and work stations graph (e) of this section, offset by at where persons are routinely assigned to least 15 feet from the nearest side of work for the majority of a shift. the mine opening unless an alternative (d) Weak walls and explosion doors method of protecting the fan and its shall have cross-sectional areas at associated components is approved in least equal to that of the entry through the ventilation plan. which the pressure from an explosion (b)(1) If an electric motor is used to underground would be relieved. A weak drive a main mine fan, the motor shall wall and explosion door combination

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shall have a total cross-sectional area (3) Electric power circuits entering at least equal to that of the entry underground areas of the mine shall be through which the pressure from an ex- deenergized. plosion underground would be relieved. (c) When a back-up fan system is (e) If a mine fan is installed in line used that does not provide the ven- with an entry, a slope, or a shaft— tilating quantity provided by the main (1) The cross-sectional area of the mine fan, persons may be permitted in pressure relief entry shall be at least the mine and electric power circuits equal to that of the fan entry; may be energized as specified in the ap- (2) The fan entry shall be developed proved ventilation plan. out of direct line with possible explo- (d) If an unusual variance in the mine sive forces; ventilation pressure is observed, or if (3) The coal or other solid material an electrical or mechanical deficiency between the pressure relief entry and of a main mine fan is detected, the the fan entry shall be at least 2,500 mine foreman or equivalent mine offi- square feet; and cial, or in the absence of the mine fore- (4) The surface opening of the pres- man or equivalent mine official, a des- sure relief entry shall be not less than ignated certified person acting for the 15 feet nor more than 100 feet from the mine foreman or equivalent mine offi- surface opening of the fan entry and cial shall be notified immediately, and from the underground intersection of appropriate action or repairs shall be the fan entry and pressure relief entry. instituted promptly. (f) In mines ventilated by multiple (e) While persons are underground, a main mine fans, incombustible doors responsible person designated by the shall be installed so that if any main operator shall always be at a surface mine fan stops and air reversals location where each main mine fan sig- through the fan are possible, the doors nal can be seen or heard. on the affected fan automatically close. (f) The area within 100 feet of main mine fans and intake air openings shall [61 FR 9829, Mar. 11, 1996, as amended at 61 be kept free of combustible material, FR 20877, May 8, 1996] unless alternative precautions necessary to provide protection from fire § 75.311 Main mine fan operation. or other products of combustion are ap- (a) Main mine fans shall be continu- proved in the ventilation plan. ously operated, except as otherwise ap- (g) If multiple mine fans are used, the proved in the ventilation plan, or when mine ventilation system shall be de- intentionally stopped for testing of signed and maintained to eliminate automatic closing doors and automatic areas without air movement. fan signal devices, maintenance or ad- (h) Any atmospheric monitoring sys- justment of the fan, or to perform tem operated during fan stoppages maintenance or repair work under- shall be intrinsically safe. ground that cannot otherwise be made while the fan is operating. § 75.312 Main mine fan examinations (b) Except as provided in paragraph and records. (c) of this section, when a main mine (a) To assure electrical and mechan- fan is intentionally stopped and the ventilating quantity provided by the ical reliability of main mine fans, each fan is not maintained by a back-up fan main mine fan and its associated com- system— ponents, including devices for meas- (1) Only persons necessary to evalu- uring or recording mine ventilation ate the effect of the fan stoppage or re- pressure, shall be examined for proper start, or to perform maintenance or re- operation by a trained person des- pair work that cannot otherwise be ignated by the operator. Examinations made while the fan is operating, shall of main mine fans shall be made at be permitted underground; least once each day that the fan oper- (2) Mechanized equipment shall be ates, unless a fan monitoring system is shut off before stopping the fan; and used. No examination is required on

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any day when no one, including cer- essary to evaluate the effect of the fan tified persons, goes underground, ex- stoppage or restart, or to perform cept that an examination shall be com- maintenance or repair work that can- pleted prior to anyone entering the not otherwise be made while the fan is mine. operating, shall be permitted under- (b)(1) If a main mine fan monitoring ground. Notwithstanding the provi- system is used, a trained person des- sions of § 75.311, underground power ignated by the operator shall— may remain energized during this test (i) At least once each day review the provided no one, including persons data provided by the fan monitoring identified in § 75.311(b)(1), is under- system to assure that the fan and the ground. If the fan is not restarted with- fan monitoring system are operating in 15 minutes, underground power shall properly. No review is required on any be deenergized and no one shall enter day when no one, including certified any underground area of the mine, persons, goes underground, except that until the fan is restarted and an exam- a review of the data shall be performed ination of the mine is conducted as de- prior to anyone entering the under- scribed in § 75.360 (b) through (e) and ground portion of the mine. Data re- the mine has been determined to be viewed should include the fan pressure, safe. bearing temperature, revolutions per (e) Circular main mine fan pressure minute, vibration, electric voltage, and recording charts shall be changed be- amperage; and fore the beginning of a second revolu- (ii) At least every 7 days— tion. (A) Test the monitoring system for (f)(1) Certification. Persons making proper operation; and main mine fan examinations shall cer- (B) Examine each main mine fan and tify by initials and date at the fan or its associated components to assure another location specified by the oper- electrical and mechanical reliability of ator that the examinations were made. main mine fans. Each certification shall identify the (2) If the monitoring system malfunc- main mine fan examined. tions, the malfunction shall be corrected, or paragraph (a) of this section (2) Persons reviewing data produced shall apply. by a main mine fan monitoring system (c) At least every 31 days, the auto- shall certify by initials and date on a matic fan signal device for each main printed copy of the data from the sys- mine fan shall be tested by stopping tem that the review was completed. In the fan. Only persons necessary to lieu of certification on a copy of the evaluate the effect of the fan stoppage data, the person reviewing the data or restart, or to perform maintenance may certify electronically that the re- or repair work that cannot otherwise view was completed. Electronic certifi- be made while the fan is operating, cation shall be by handwritten initials shall be permitted underground. Not- and date in a computer system so as to withstanding the requirement of be secure and not susceptible to alter- § 75.311(b)(3), underground power may ation. remain energized during this test pro- (g)(1) Recordkeeping. By the end of the vided no one, including persons identi- shift on which the examination is fied in § 75.311(b)(1), is underground. If made, persons making main mine fan the fan is not restarted within 15 min- examinations shall record all uncor- utes, underground power shall be deen- rected defects that may affect the op- ergized and no one shall enter any un- eration of the fan that are not cor- derground area of the mine until the rected by the end of that shift. Records fan is restarted and an examination of shall be maintained in a secure book the mine is conducted as described in that is not susceptible to alteration or § 75.360 (b) through (e) and the mine has electronically in a computer system so been determined to be safe. as to be secure and not susceptible to (d) At least every 31 days, the auto- alteration. matic closing doors in multiple main (2) When a fan monitoring system is mine fan systems shall be tested by used in lieu of the daily fan examina- stopping the fan. Only persons nection—

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(i) The certified copies of data pro- methane in the working places and in duced by fan monitoring systems shall other areas where methane is likely to be maintained separate from other accumulate before work is resumed and computer-generated reports or data; before equipment is energized or re- and started in these areas. (ii) A record shall be made of any fan (c) If ventilation is not restored with- monitoring system malfunctions, elec- in 15 minutes after a main mine fan trical or mechanical deficiencies in the stops— monitoring system and any sudden in- (1) Everyone shall be withdrawn from crease or loss in mine ventilating pres- the mine; sure. The record shall be made by the (2) Underground electric power cir- end of the shift on which the review of cuits shall be deenergized. However, the data is completed and shall be circuits necessary to withdraw persons maintained in a secure book that is not from the mine need not be deenergized susceptible to alteration or electroni- if located in areas or haulageways cally in a computer system so as to be where methane is not likely to migrate secure and not susceptible to alter- to or accumulate. These circuits shall ation. be deenergized as persons are with- (3) By the end of the shift on which drawn; and the monthly test of the automatic fan (3) Mechanized equipment not lo- signal device or the automatic closing cated on working sections shall be shut doors is completed, persons making off. However, mechanized equipment these tests shall record the results of necessary to withdraw persons from the tests. Records shall be maintained the mine need not be shut off if located in a secure book that is not susceptible in areas where methane is not likely to to alteration or electronically in a migrate to or accumulate. computer system so as to be secure and (d)(1) When ventilation is restored— not susceptible to alteration. (i) No one other than designated cer- (h) Retention period. Records, includ- tified examiners shall enter any under- ing records of mine fan pressure and ground area of the mine until an exam- the certified copies of data produced by ination is conducted as described in fan monitoring systems, shall be re- § 75.360(b) through (e) and the area has tained at a surface location at the been determined to be safe. Designated mine for at least 1 year and shall be certified examiners shall enter the un- made available for inspection by au- derground area of the mine from which thorized representatives of the Sec- miners have been withdrawn only after retary and the representative of min- the fan has operated for at least 15 ers. minutes unless a longer period of time is specified in the approved ventilation § 75.313 Main mine fan stoppage with plan. persons underground. (ii) Underground power circuits shall (a) If a main mine fan stops while not be energized and nonpermissible anyone is underground and the ven- mechanized equipment shall not be tilating quantity provided by the fan is started or operated in an area until an not maintained by a back-up fan sys- examination is conducted as described tem— in § 75.360(b) through (e) and the area (1) Electrically powered equipment in has been determined to be safe, except each working section shall be deener- that designated certified examiners gized; may use nonpermissible transportation (2) Other mechanized equipment in equipment in intake airways to facili- each working section shall be shut off; tate the making of the required exam- and ination. (3) Everyone shall be withdrawn from (2) If ventilation is restored to the the working sections and areas where mine before miners reach the surface, mechanized mining equipment is being the miners may return to underground installed or removed. working areas only after an examina- (b) If ventilation is restored within 15 tion of the areas is made by a certified minutes after a main mine fan stops, person and the areas are determined to certified persons shall examine for be safe.

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(e) Any atmospheric monitoring sys- the air current in these areas shall be tem operated during fan stoppages sufficient to dilute, render harmless, shall be intrinsically safe. and carry away flammable, explosive, (f) Any electrical refuge alternative noxious, and harmful gases, dusts, components exposed to the mine at- smoke, and fumes. mosphere shall be approved as intrinsi- (2) The air in areas of bleeder entries cally safe for use during fan stoppages. and worked-out areas where persons Any electrical refuge alternative com- work or travel shall contain at least ponents located inside the refuge alter- 19.5 percent oxygen, and carbon dioxide native shall be either approved as in- levels shall not exceed 0.5 percent time trinsically safe or approved as permis- weighted average and 3.0 percent short sible for use during fan stoppages. term exposure limit. [61 FR 9829, Mar. 11, 1996, as amended at 73 (b) Notwithstanding the provisions of FR 80697, Dec. 31, 2008] § 75.322, for the purpose of preventing explosions from gases other than meth- § 75.320 Air quality detectors and ane, the following gases shall not be measurement devices. permitted to accumulate in excess of (a) Tests for methane shall be made the concentrations listed below: by a qualified person with MSHA ap- (1) Carbon monoxide (CO)—2.5 per- proved detectors that are maintained cent in permissible and proper operating (2) Hydrogen (H )—.80 percent condition and calibrated with a known 2 (3) Hydrogen sulfide (H S)—.80 per- methane-air mixture at least once 2 cent every 31 days. (b) Tests for oxygen deficiency shall (4) Acetylene (C2 H2)—.40 percent be made by a qualified person with (5) Propane (C3 H8)—.40 percent MSHA approved oxygen detectors that (6) MAPP (methyl-acetylene-pro- are maintained in permissible and pylene-propodiene)—.30 percent proper operating condition and that can detect 19.5 percent oxygen with an § 75.322 Harmful quantities of noxious accuracy of ±0.5 percent. The oxygen gases. detectors shall be calibrated at the Concentrations of noxious or poi- start of each shift that the detectors sonous gases, other than carbon diox- will be used. ide, shall not exceed the threshold (c) Handheld devices that contain limit values (TLV) as specified and ap- electrical components and that are plied by the American Conference of used for measuring air velocity, carbon Governmental Industrial Hygienists in monoxide, oxides of nitrogen, and other ‘‘Threshold Limit Values for Substance gases shall be approved and maintained in Workroom Air’’ (1972). Detectors or in permissible and proper operating laboratory analysis of mine air samples condition. shall be used to determine the con- (d) An oxygen detector approved by centrations of harmful, noxious, or poi- MSHA shall be used to make tests for sonous gases. This incorporation by oxygen deficiency required by the regu- reference has been approved by the Di- lations in this part. Permissible flame rector of the Federal Register in ac- safety lamps may only be used as a cordance with 5 U.S.C. 552(a) and 1 CFR supplementary testing device. part 51. Copies are available from (e) Maintenance of instruments re- MSHA’s Office of Standards, Regula- quired by paragraphs (a) through (d) of tions, and Variances, 201 12th Street this section shall be done by persons South, Arlington, VA 22202–5452; 202– trained in such maintenance. 693–9440; and at every MSHA Coal Mine Safety and Health District Office. The § 75.321 Air quality. material is available for examination (a)(1) The air in areas where persons at the National Archives and Records work or travel, except as specified in Administration (NARA). For informa- paragraph (a)(2) of this section, shall tion on the availability of this mate- contain at least 19.5 percent oxygen rial at NARA, call 202–741–6030, or go and not more than 0.5 percent carbon to: http://www.archives.gov/ dioxide, and the volume and velocity of federallregister/

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codeloflfederallregulations/ section and where that split of air ibrllocations.html. meets another split of air, or the location where the split is used to ventilate [80 FR 52991, Sept. 2, 2015] seals or worked-out areas— § 75.323 Actions for excessive methane. (i) Everyone except those persons referred to in § 104(c) of the Act shall be (a) Location of tests. Tests for meth- withdrawn from the affected area; ane concentrations under this section (ii) Other than intrinsically safe shall be made at least 12 inches from AMS, equipment in the affected area the roof, face, ribs, and floor. (b) Working places and intake air shall be deenergized, electric power courses. (1) When 1.0 percent or more shall be disconnected at the power methane is present in a working place source, and other mechanized equip- or an intake air course, including an ment shall be shut off; and air course in which a belt conveyor is (iii) No other work shall be permitted located, or in an area where mecha- in the affected area until the methane nized mining equipment is being in- concentration in the return air is less stalled or removed— than 1.0 percent. (i) Except intrinsically safe atmos- (d) Return air split alternative. (1) The pheric monitoring systems (AMS), provisions of this paragraph apply if— electrically powered equipment in the (i) The quantity of air in the split affected area shall be deenergized, and ventilating the active workings is at other mechanized equipment shall be least 27,000 cubic feet per minute in the shut off; last open crosscut or the quantity spec- (ii) Changes or adjustments shall be ified in the approved ventilation plan, made at once to the ventilation system whichever is greater; to reduce the concentration of methane (ii) The methane content of the air in to less than 1.0 percent; and the split is continuously monitored (iii) No other work shall be permitted during mining operations by an AMS in the affected area until the methane that gives a visual and audible signal concentration is less than 1.0 percent. on the working section when the meth- (2) When 1.5 percent or more methane ane in the return air reaches 1.5 per- is present in a working place or an in- cent, and the methane content is mon- take air course, including an air course itored as specified in § 75.351; and in which a belt conveyor is located, or (iii) Rock dust is continuously ap- in an area where mechanized mining plied with a mechanical duster to the equipment is being installed or re- return air course during coal produc- moved— tion at a location in the air course im- (i) Everyone except those persons re- mediately outby the most inby moni- ferred to in § 104(c) of the Act shall be toring point. withdrawn from the affected area; and (2) When 1.5 percent or more methane (ii) Except for intrinsically safe is present in a return air split between AMS, electrically powered equipment a point in the return opposite the sec- in the affected area shall be discon- tion loading point and where that split nected at the power source. of air meets another split of air or (c) Return air split. (1) When 1.0 per- where the split of air is used to venti- cent or more methane is present in a late seals or worked-out areas— return air split between the last work- (i) Changes or adjustments shall be ing place on a working section and made at once to the ventilation system where that split of air meets another to reduce the concentration of methane split of air, or the location at which in the return air below 1.5 percent; the split is used to ventilate seals or (ii) Everyone except those persons re- worked-out areas changes or adjust- ferred to in § 104(c) of the Act shall be ments shall be made at once to the withdrawn from the affected area; ventilation system to reduce the con- (iii) Except for intrinsically safe centration of methane in the return air AMS, equipment in the affected area to less than 1.0 percent. shall be deenergized, electric power (2) When 1.5 percent or more methane shall be disconnected at the power is present in a return air split between source, and other mechanized equip- the last working place on a working ment shall be shut off; and

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(iv) No other work shall be permitted required to be specified in the approved in the affected area until the methane ventilation plan for other working concentration in the return air is less places or working faces. than 1.5 percent. (2) The quantity of air reaching the (e) Bleeders and other return air working face shall be determined at or courses. The concentration of methane near the face end of the line curtain, in a bleeder split of air immediately ventilation tubing, or other ventilation before the air in the split joins another control device. If the curtain, tubing, split of air, or in a return air course or device extends beyond the last row other than as described in paragraphs of permanent roof supports, the quan- (c) and (d) of this section, shall not ex- tity of air reaching the working face ceed 2.0 percent. shall be determined behind the line curtain or in the ventilation tubing at § 75.324 Intentional changes in the or near the last row of permanent sup- ventilation system. ports. When machine-mounted dust (a) A person designated by the oper- collectors are used in conjunction with ator shall supervise any intentional blowing face ventilation systems, the change in ventilation that— quantity of air reaching the working (1) Alters the main air current or any face shall be determined with the dust split of the main air current in a man- collector turned off. ner that could materially affect the (3) If machine mounted dust collec- safety or health of persons in the mine; tors or diffuser fans are used, the ap- or proved ventilation plan shall specify (2) Affects section ventilation by the operating volume of the dust col- 9,000 cubic feet per minute of air or lector or diffuser fan. more in bituminous or lignite mines, or (b) In bituminous and lignite mines, 5,000 cubic feet per minute of air or the quantity of air reaching the last more in anthracite mines. open crosscut of each set of entries or (b) Intentional changes shall be made rooms on each working section and the only under the following conditions: quantity of air reaching the intake end (1) Electric power shall be removed of a pillar line shall be at least 9,000 from areas affected by the ventilation cubic feet per minute unless a greater change and mechanized equipment in quantity is required to be specified in those areas shall be shut off before the the approved ventilation plan. This ventilation change begins. minimum also applies to sections (2) Only persons making the change which are not operating but are capa- in ventilation shall be in the mine. ble of producing coal by simply ener- (3) Electric power shall not be re- gizing the equipment on the section. stored to the areas affected by the ven- (c) In longwall and shortwall mining tilation change and mechanized equip- systems— ment shall not be restarted until a cer- (1) The quantity of air shall be at tified person has examined these areas least 30,000 cubic feet per minute reach- for methane accumulation and for oxy- ing the working face of each longwall, gen deficiency and has determined that unless the operator demonstrates that the areas are safe. a lesser air quantity will maintain con- tinual compliance with applicable § 75.325 Air quantity. methane and respirable dust standards. (a)(1) In bituminous and lignite This lesser quantity shall be specified mines the quantity of air shall be at in the approved ventilation plan. A least 3,000 cubic feet per minute reach- quantity greater than 30,000 cubic feet ing each working face where coal is per minute may be required to be speci- being cut, mined, drilled for blasting, fied in the approved ventilation plan. or loaded. When a greater quantity is (2) The velocity of air that will be necessary to dilute, render harmless, provided to control methane and res- and carry away flammable, explosive, pirable dust in accordance with appli- noxious, and harmful gases, dusts, cable standards on each longwall or smoke, and fumes, this quantity shall shortwall and the locations where be specified in the approved ventilation these velocities will be provided shall plan. A minimum air quantity may be be specified in the approved ventilation

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plan. The locations specified shall be at installed or removed must be at least least 50 feet but no more than 100 feet the sum of that specified on the ap- from the headgate and tailgate, respec- proval plates of all the diesel-powered tively. equipment on the working section or in (d) Ventilation shall be maintained the area where mechanized mining during installation and removal of equipment is being installed or re- mechanized mining equipment. The ap- moved. The minimum ventilating air proved ventilation plan shall specify quantity shall be specified in the ap- the minimum quantity of air, the loca- proved ventilation plan. For working tions where this quantity will be pro- sections such air quantity must be vided and the ventilation controls re- maintained— quired. (1) In the last open crosscut of each (e) In anthracite mines, the quantity set of entries or rooms in each working of air shall be as follows: section; (1) At least 1,500 cubic feet per (2) In the intake, reaching the work- minute reaching each working face ing face of each longwall; and where coal is being mined, unless a (3) At the intake end of any pillar greater quantity is required to be spec- line. ified in the approved ventilation plan. (h) The following equipment may be (2) At least 5,000 cubic feet per excluded from the calculations of ven- minute passing through the last open tilating air quantity under paragraph crosscut in each set of entries or rooms (g) if such equipment exclusion is ap- and at the intake end of any pillar line, proved by the district manager and unless a greater quantity is required to specified in the ventilation plan: be specified in the approved ventilation plan. (1) Self-propelled equipment meeting (3) When robbing areas where air cur- the requirements of § 75.1908(b); rents cannot be controlled and air (2) Equipment that discharges its ex- measurements cannot be obtained, the haust into intake air that is coursed air shall have perceptible movement. directly to a return air course; (f) The minimum ventilating air (3) Equipment that discharges its ex- quantity for an individual unit of die- haust directly into a return air course; sel-powered equipment being operated and shall be at least that specified on the (4) Other equipment having duty cy- approval plate for that equipment. cles such that the emissions would not Such air quantity shall be main- significantly affect the exposure of tained— miners. (1) In any working place where the (i) A ventilating air quantity that is equipment is being operated; less than what is required by paragraph (2) At the section loading point dur- (g) of this section may be approved by ing any shift the equipment is being the district manager in the ventilation operated on the working section; plan based upon the results of sampling (3) In any entry where the equipment that demonstrate that the lesser air is being operated outby the section quantity will maintain continuous loading point in areas of the mine de- compliance with applicable TLV ®’s. veloped on or after April 25, 1997; (j) If during sampling required by (4) In any air course with single or § 70.1900(c) of this subchapter the ven- multiple entries where the equipment tilating air is found to contain con- is being operated outby the section centrations of CO or NO2 in excess of loading point in areas of the mine de- the action level specified by § 70.1900(c), veloped prior to April 25, 1997; and higher action levels may be approved (5) At any other location required by by the district manager based on the the district manager and specified in results of sampling that demonstrate the approved ventilation plan. that a higher action level will main- (g) The minimum ventilating air tain continuous compliance with appli- quantity where multiple units of die- cable TLV ®’s. Action levels other than sel-powered equipment are operated on those specified in § 70.1900(c) shall be working sections and in areas where specified in the approved ventilation mechanized mining equipment is being plan.

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(k) As of November 25, 1997 the ven- velocity may be required to limit the tilating air quantity required where methane content in these haulage en- diesel-powered equipment is operated tries or elsewhere in the mine to less shall meet the requirements of para- than 1.0 percent and provide an ade- graphs (f) through (j) of this section. quate supply of oxygen. Mine operators utilizing diesel-powered equipment in underground coal mines § 75.330 Face ventilation control de- shall submit to the appropriate MSHA vices. district manager a revised ventilation (a) Brattice cloth, ventilation tubing plan or appropriate amendments to the and other face ventilation control de- existing plan, in accordance with vices shall be made of flame-resistant § 75.371, which implement the require- material approved by MSHA. ments of paragraphs (f) through (j) of (b)(1) Ventilation control devices this section. shall be used to provide ventilation to [61 FR 9828, Mar. 11, 1996; 61 FR 26442, May 28, dilute, render harmless, and to carry 1996; 61 FR 29288, June 10, 1996, as amended at away flammable, explosive, noxious, 61 FR 55526, Oct. 25, 1996; 62 FR 34641, June 27, and harmful gases, dusts, smoke, and 1997; 79 FR 24987, May 1, 2014] fumes— (i) To each working face from which § 75.326 Mean entry air velocity. coal is being cut, mined, drilled for In exhausting face ventilation sys- blasting, or loaded; and tems, the mean entry air velocity shall (ii) To any other working places as be at least 60 feet per minute reaching required by the approved ventilation each working face where coal is being plan. cut, mined, drilled for blasting, or load- (2) These devices shall be installed at ed, and to any other working places as a distance no greater than 10 feet from required in the approved ventilation the area of deepest penetration to plan. A lower mean entry air velocity which any portion of the face has been may be approved in the ventilation advanced unless an alternative dis- plan if the lower velocity will maintain tance is specified and approved in the methane and respirable dust concentra- ventilation plan. Alternative distances tions in accordance with the applicable specified shall be capable of maintain- levels. Mean entry air velocity shall be ing concentrations of respirable dust, determined at or near the inby end of methane, and other harmful gases, in the line curtain, ventilation tubing, or accordance with the levels specified in other face ventilation control devices. the applicable sections of this chapter. [61 FR 9828, Mar. 11, 1996; 61 FR 29288, June (c) When the line brattice or any 10, 1996] other face ventilation control device is damaged to an extent that ventilation § 75.327 Air courses and trolley haul- of the working face is inadequate, pro- age systems. duction activities in the working place (a) In any mine opened on or after shall cease until necessary repairs are March 30, 1970, or in any new working made and adequate ventilation is re- section of a mine opened before that stored. date, where trolley haulage systems are maintained and where trolley wires [61 FR 9828, Mar. 11, 1996; 61 FR 29288, June or trolley feeder wires are installed, an 10, 1996] authorized representative of the Sec- § 75.331 Auxiliary fans and tubing. retary shall require enough entries or rooms as intake air courses to limit (a) When auxiliary fans and tubing the velocity of air currents in the are used for face ventilation, each aux- haulageways to minimize the hazards iliary fan shall be— of fires and dust explosions in the (1) Permissible, if the fan is elec- haulageways. trically operated; (b) Unless the district manager ap- (2) Maintained in proper operating proves a higher velocity, the velocity condition; of the air current in the trolley haul- (3) Deenergized or shut off when no age entries shall be limited to not more one is present on the working section; than 250 feet per minute. A higher air and

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(4) Located and operated to avoid re- (2) Air that has passed by any open- circulation of air. ing of any unsealed area that is not ex- (b) If a deficiency exists in any auxil- amined under §§ 75.360, 75.361 or 75.364 of iary fan system, the deficiency shall be this subpart, shall not be used to venti- corrected or the auxiliary fan shall be late any working place. deenergized immediately. (c) If the air passing through an aux- § 75.333 Ventilation controls. iliary fan or tubing contains 1.0 per- (a) For purposes of this section, cent or more methane, power to elec- ‘‘doors’’ include any door frames. trical equipment in the working place (b) Permanent stoppings or other per- and to the auxiliary fan shall be deen- manent ventilation control devices ergized, and other mechanized equip- constructed after November 15, 1992, ment in the working place shall be shall be built and maintained— shut off until the methane concentration is reduced to less than 1.0 percent. (1) Between intake and return air (d) When an auxiliary fan is courses, except temporary controls stopped— may be used in rooms that are 600 feet (1) Line brattice or other face ven- or less from the centerline of the entry tilation control devices shall be used to from which the room was developed in- maintain ventilation to affected faces; cluding where continuous face haulage and systems are used in such rooms. Unless (2) Electrical equipment in the af- otherwise approved in the ventilation fected working places shall be discon- plan, these stoppings or controls shall nected at the power source, and other be maintained to and including the mechanized equipment shall be shut off third connecting crosscut outby the until ventilation to the working place working face; is restored. (2) To separate belt conveyor haulageways from return air courses, § 75.332 Working sections and working except where belt entries in areas of places. mines developed before March 30, 1970, (a)(1) Each working section and each are used as return air courses; area where mechanized mining equip- (3) To separate belt conveyor ment is being installed or removed, haulageways from intake air courses shall be ventilated by a separate split when the air in the intake air courses of intake air directed by overcasts, is used to provide air to active working undercasts or other permanent ventila- places. Temporary ventilation controls tion controls. may be used in rooms that are 600 feet (2) When two or more sets of mining or less from the centerline of the entry equipment are simultaneously engaged from which the rooms were developed in cutting, mining, or loading coal or including where continuous face haul- rock from working places within the age systems are used in such rooms. same working section, each set of min- When continuous face haulage systems ing equipment shall be on a separate are used, permanent stoppings or other split of intake air. permanent ventilation control devices (3) For purposes of this section, a set shall be built and maintained to the of mining equipment includes a single outby most point of travel of the dolly loading machine, a single continuous or 600 feet from the point of deepest mining machine, or a single longwall penetration in the conveyor belt entry, or shortwall mining machine. whichever distance is closer to the (b)(1) Air that has passed through point of deepest penetration, to sepa- any area that is not examined under rate the continuous haulage entry from §§ 75.360, 75.361 or 75.364 of this subpart, the intake entries; or through an area where second min- (4) To separate the primary ing has been done shall not be used to escapeway from belt and trolley haul- ventilate any working place. Second age entries, as required by § 75.380(g). mining is intentional retreat mining For the purposes of § 75.380(g), the load- where pillars have been wholly or par- ing point for a continuous haulage sys- tially removed, regardless of the tem shall be the outby most point of amount of recovery obtained. travel of the dolly or 600 feet from the

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point of deepest penetration, whichever the American Society for Testing and distance is less; and Materials (ASTM), 100 Barr Harbor (5) In return air courses to direct air Drive, P.O. Box C700, West into adjacent worked-out areas. Conshohocken, PA 19428–2959; 610–832– (c) Personnel doors shall be con- 9500; http://www.astm.org. This incorpo- structed of noncombustible material ration by reference was approved by and shall be of sufficient strength to the Director of the Federal Register in serve their intended purpose of main- accordance with 5 U.S.C. 552(a) and 1 taining separation and permitting CFR part 51. travel between air courses, and shall be (2) Of sufficient strength to serve installed as follows in permanent their intended purpose of maintaining stoppings constructed after November separation and permitting travel be- 15, 1992: tween or within air courses or entries. (1) The distance between personnel (3) Installed in pairs to form an air- doors shall be no more than 300 feet in lock. When an airlock is used, one side seam heights below 48 inches and 600 of the airlock shall remain closed. feet in seam heights 48 inches or high- When not in use, both sides shall be er. closed. (2) The location of all personnel doors (e)(1)(i) Except as provided in para- in stoppings along escapeways shall be graphs (e)(2), (3), and (4) of this section, clearly marked so that the doors may all overcasts, undercasts, shaft parti- be easily identified by anyone trav- tions, permanent stoppings, and regu- eling in the escapeway and in the en- lators, installed after June 10, 1996, tries on either side of the doors. shall be constructed in a traditionally (3) When not in use, personnel doors accepted method and of materials that shall be closed. have been demonstrated to perform (4) An airlock shall be established adequately or in a method and of mate- where the air pressure differential be- rials that have been tested and shown tween air courses creates a static force to have a minimum strength equal to exceeding 125 pounds on closed per- or greater than the traditionally ac- sonnel doors along escapeways. cepted in-mine controls. Tests may be (d) Doors, other than personnel performed under ASTM E72–80, doors, constructed after November 15, ‘‘Standard Methods of Conducting 1992, that are used in lieu of permanent Strength Tests of Panels for Building stoppings or to control ventilation Construction’’ (Section 12–Transverse within an air course shall be: Load–Specimen Vertical, load, only), (1) Made of noncombustible material or the operator may conduct compara- or coated on all accessible surfaces tive in-mine tests. In-mine tests shall with flame-retardant materials having be designed to demonstrate the com- a flame-spread index of 25 or less, as parative strength of the proposed con- tested under ASTM E162–87, ‘‘Standard struction and a traditionally accepted Test Method for Surface Flammability in-mine control. The publication of Materials Using a Radiant Heat En- ASTM E72–80, ‘‘Standard Methods of ergy Source.’’ This publication is in- Conducting Strength Tests of Panels corporated by reference and may be infor Building Construction,’’ is incor- spected at any MSHA Coal Mine Safety porated by reference and may be in- and Health District Office, or at spected at any MSHA Coal Mine Safety MSHA’s Office of Standards, Regula- and Health District Office, or at tions, and Variances, 201 12th Street MSHA’s Office of Standards, Regula- South, Arlington, VA 22202–5452; 202– tions, and Variances, 201 12th Street 693–9440; and at the National Archives South, Arlington, VA 22202–5452; 202– and Records Administration (NARA). 693–9440; and at the National Archives For information on the availability of and Records Administration (NARA). this material at NARA, call 202–741– For information on the availability of 6030, or go to: http://www.archives.gov/ this material at NARA, call 202–741– federallregister/ 6030, or go to: http://www.archives.gov/ codeloflfederallregulations/ federallregister/ ibrllocations.html. In addition, copies codeloflfederallregulations/ of the document can be purchased from ibrllocations.html. In addition, copies

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of the document can be purchased from the Director of the Federal Register in the American Society for Testing and accordance with 5 U.S.C. 552(a) and 1 Materials (ASTM), 100 Barr Harbor CFR part 51. Drive, P.O. Box C700, West (4) In anthracite mines, doors and Conshohocken, PA 19428–2959; 610–832– regulators may be constructed of over- 9500; http://www.astm.org. This incorpo- lapping layers of hardwood boards, if ration by reference was approved by the doors, door frames, and regulators the Director of the Federal Register in are a minimum 2 inches thick. accordance with 5 U.S.C. 552(a) and 1 (f) When sealants are applied to ven- CFR part 51. tilation controls, the sealant shall (ii) All overcasts, undercasts, shaft have a flame-spread index of 25 or less partitions, permanent stoppings, and regulators, installed after November 15, under ASTM E162–87, ‘‘Standard Test 1992, shall be constructed of non- Method for Surface Flammability of combustible material. Materials that Materials Using a Radiant Heat Energy are suitable for the construction of Source.’’ This publication is incor- overcasts, undercasts, shaft partitions, porated by reference and may be in- permanent stoppings, and regulators spected at any MSHA Coal Mine Safety include concrete, concrete block, brick, and Health District Office, or at cinder block, tile, or steel. No ventila- MSHA’s Office of Standards, Regula- tion controls installed after November tions, and Variances, 201 12th Street 15, 1992, shall be constructed of alu- South, Arlington, VA 22202–5452; 202– minum. 693–9440; and at the National Archives (2) In anthracite mines, permanent and Records Administration (NARA). stoppings may be constructed of over- For information on the availability of lapping layers of hardwood mine this material at NARA, call 202–741– boards, if the stoppings are a minimum 6030, or go to: http://www.archives.gov/ 2 inches thick. federallregister/ (3) When timbers are used to create codeloflfederallregulations/ permanent stoppings in heaving or cav- ibrllocations.html. In addition, copies ing areas, the stoppings shall be coated of the document can be purchased from on all accessible surfaces with a flame- the American Society for Testing and retardant material having a flame- Materials (ASTM), 100 Barr Harbor spread index of 25 or less, as tested Drive, P.O. Box C700, West under ASTM E162–87, ‘‘Standard Test Conshohocken, PA 19428–2959; 610–832– Method for Surface Flammability of Materials Using a Radiant Heat Energy 9500; http://www.astm.org. This incorpo- Source.’’ This publication is incor- ration by reference was approved by porated by reference and may be in- the Director of the Federal Register in spected at any MSHA Coal Mine Safety accordance with 5 U.S.C. 552(a) and 1 and Health District Office, or at CFR part 51. MSHA’s Office of Standards, Regula- (g) Before mining is discontinued in tions, and Variances, 201 12th Street an entry or room that is advanced South, Arlington, VA 22202–5452; 202– more than 20 feet from the inby rib, a 693–9440; and at the National Archives crosscut shall be made or line brattice and Records Administration (NARA). shall be installed and maintained to For information on the availability of provide adequate ventilation. When this material at NARA, call 202–741– conditions such as methane liberation 6030, or go to: http://www.archives.gov/ warrant a distance less than 20 feet, federallregister/ the approved ventilation plan shall codeloflfederallregulations/ specify the location of such rooms or ibrllocations.html. In addition, copies entries and the maximum distance of the document can be purchased from they will be developed before a cross- the American Society for Testing and cut is made or line brattice is installed. Materials (ASTM), 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428–2959; 610–832– 9500; http://www.astm.org. This incorporation by reference was approved by

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(h) All ventilation controls, including (e) Each mining system shall be de- seals, shall be maintained to serve the signed so that each worked-out area purpose for which they were built. can be sealed. The approved ventilation plan shall specify the location and the [61 FR 9829, Mar. 11, 1996; 61 FR 20877, May 8, 1996; 61 FR 26442, May 28, 1996; 61 FR 29288, sequence of construction of proposed 29289, June 10, 1996, as amended at 67 FR seals. 38386, June 4, 2002; 71 FR 16668, Apr. 3, 2006; 73 (f) In place of the requirements of FR 80612, Dec. 31, 2008; 80 FR 52991, Sept. 2, paragraphs (a) and (b) of this section, 2015] for mines with a demonstrated history of spontaneous combustion, or that are § 75.334 Worked-out areas and areas located in a coal seam determined to where pillars are being recovered. be susceptible to spontaneous combus- (a) Worked-out areas where no pillars tion, the approved ventilation plan have been recovered shall be— shall specify the following: (1) Ventilated so that methane-air (1) Measures to detect methane, car- mixtures and other gases, dusts, and bon monoxide, and oxygen concentra- fumes from throughout the worked-out tions during and after pillar recovery, areas are continuously diluted and and in worked-out areas where no pil- routed into a return air course or to lars have been recovered, to determine the surface of the mine; or if the areas must be ventilated or (2) Sealed. sealed. (b)(1) During pillar recovery a bleeder (2) Actions that will be taken to pro- system shall be used to control the air tect miners from the hazards of sponta- passing through the area and to con- neous combustion. tinuously dilute and move methane-air (3) If a bleeder system will not be mixtures and other gases, dusts, and used, the methods that will be used to fumes from the worked-out area away control spontaneous combustion, accu- from active workings and into a return mulations of methane-air mixtures, air course or to the surface of the and other gases, dusts, and fumes in mine. the worked-out area. (2) After pillar recovery a bleeder system shall be maintained to provide § 75.335 Seal strengths, design applica- ventilation to the worked-out area, or tions, and installation. the area shall be sealed. (a) Seal strengths. Seals constructed (c) The approved ventilation plan on or after October 20, 2008 shall be de- shall specify the following: signed, constructed, and maintained to (1) The design and use of bleeder sys- withstand— tems; (1)(i) At least 50-psi overpressure (2) The means to determine the effec- when the atmosphere in the sealed area tiveness of bleeder systems; is monitored and maintained inert and (3) The means for adequately main- designed using a pressure-time curve taining bleeder entries free of obstruc- with an instantaneous overpressure of tions such as roof falls and standing at least 50 psi. A minimum over- water; and pressure of at least 50 psi shall be (4) The location of ventilating de- maintained for at least four seconds vices such as regulators, stoppings and then released instantaneously. bleeder connectors used to control air (ii) Seals constructed to separate the movement through the worked-out active longwall panel from the area. longwall panel previously mined shall (d) If the bleeder system used does be designed using a pressure-time curve not continuously dilute and move with a rate of pressure rise of at least methane-air mixtures and other gases, 50 psi in 0.1 second. A minimum over- dusts, and fumes away from worked- pressure of at least 50 psi shall be out areas into a return air course or to maintained; or the surface of the mine, or it cannot be (2)(i) Overpressures of at least 120 psi determined by examinations or evalua- if the atmosphere in the sealed area is tions under § 75.364 that the bleeder sys- not monitored, is not maintained inert, tem is working effectively, the worked- the conditions in paragraphs (a)(3)(i) out area shall be sealed. through (iii) of this section are not

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present, and the seal is designed using accordance with current, prudent engi- a pressure-time curve with an instanta- neering practices and is applicable to neous overpressure of at least 120 psi. A conditions in an underground coal minimum overpressure of 120 psi shall mine; and be maintained for at least four seconds (iii) Include a summary of the instal- then released instantaneously. lation procedures related to seal con- (ii) Seals constructed to separate the struction; or active longwall panel from the (2) Each application based on full- longwall panel previously mined shall scale explosion tests or equivalent be designed using a pressure-time curve means of physical testing shall address with a rate of pressure rise of 120 psi in the following requirements to ensure 0.25 second. A minimum overpressure that a seal can reliably meet the seal of 120 psi shall be maintained; or strength requirements: (3) Overpressures greater than 120 psi (i) Certification by a professional en- if the atmosphere in the sealed area is gineer that the testing was done in ac- not monitored and is not maintained cordance with current, prudent engi- inert, and neering practices for construction in a (i) The atmosphere in the sealed area coal mine; is likely to contain homogeneous mix- (ii) Technical information related to tures of methane between 4.5 percent the methods and materials; and 17.0 percent and oxygen exceeding (iii) Supporting documentation; 17.0 percent throughout the entire (iv) An engineering analysis to ad- area; dress differences between the seal sup- (ii) Pressure piling could result in port during test conditions and the overpressures greater than 120 psi in range of conditions in a coal mine; and the area to be sealed; or (v) A summary of the installation (iii) Other conditions are encoun- procedures related to seal construc- tered, such as the likelihood of a deto- tion. nation in the area to be sealed. (3) MSHA will notify the applicant if (iv) Where the conditions in para- additional information or testing is re- graphs (a)(3)(i), (ii), or (iii) of this sec- quired. The applicant shall provide this tion are encountered, the mine oper- information, arrange any additional or ator shall revise the ventilation plan to repeat tests, and provide prior notifica- address the potential hazards. The plan tion to MSHA of the location, date, and shall include seal strengths sufficient time of such test(s). to address such conditions. (4) MSHA will notify the applicant, (b) Seal design applications. Seal de- in writing, whether the design is ap- sign applications from seal manufac- proved or denied. If the design is de- turers or mine operators shall be in ac- nied, MSHA will specify, in writing, cordance with paragraph (b)(1) or (2) of the deficiencies of the application, or this section and submitted for approval necessary revisions. to MSHA’s Office of Technical Support, (5) Once the seal design is approved, Pittsburgh Safety and Health Tech- the approval holder shall promptly no- nology Center, 626 Cochrans Mill Road, tify MSHA, in writing, of all defi- Building 151, Pittsburgh, PA 15236–3611. ciencies of which they become aware. (1) An engineering design application (c) Seal installation approval. The in- shall— stallation of the approved seal design (i) Address gas sampling pipes, water shall be subject to approval in the ven- drainage systems, methods to reduce tilation plan. The mine operator air leakage, pressure-time curve, fire shall— resistance characteristics, flame (1) Retain the seal design approval spread index, entry size, engineering and installation information for as design and analysis, elasticity of de- long as the seal is needed to serve the sign, material properties, construction purpose for which it was built. specifications, quality control, design (2) Designate a professional engineer references, and other information re- to conduct or have oversight of seal in- lated to seal construction; stallation and certify that the provi- (ii) Be certified by a professional en- sions in the approved seal design speci- gineer that the design of the seal is in fied in this section have been addressed

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and are applicable to conditions at the sealed areas. Sealed areas shall be mine. A copy of the certification shall monitored, whether ingassing or be submitted to the District Manager outgassing, for methane and oxygen with the information provided in para- concentrations and the direction of graph (c)(3) of this section and a copy leakage. of the certification shall be retained (1) Each sampling pipe and approved for as long as the seal is needed to sampling location shall be sampled at serve the purpose for which it was least every 24 hours. built. (i) Atmospheres with seals of 120 psi (3) Provide the following information or greater shall be sampled until the for approval in the ventilation plan— design strength is reached for every (i) The MSHA Technical Support Ap- seal used to seal the area. proval Number; (ii) Atmospheres with seals less than (ii) A summary of the installation 120 psi constructed before October 20, procedures; 2008 shall be monitored for methane (iii) The mine map of the area to be and oxygen concentrations and main- sealed and proposed seal locations that tained inert. The operator may request include the deepest points of penetra- that the District Manager approve dif- tion prior to sealing. The mine map ferent sampling locations and fre- shall be certified by a professional en- quencies in the ventilation plan, pro- gineer or a professional land surveyor. (iv) Specific mine site information, vided at least one sample is taken at including— each set of seals at least every 7 days. (A) Type of seal; (iii) Atmospheres with seals less than (B) Safety precautions taken prior to 120 psi constructed after October 20, seal achieving design strength; 2008 shall be monitored for methane (C) Methods to address site-specific and oxygen concentrations and main- conditions that may affect the tained inert. The operator may request strength and applicability of the seal that the District Manager approve dif- including set-back distances; ferent sampling locations and fre- (D) Site preparation; quencies in the ventilation plan after a (E) Sequence of seal installations; minimum of 14 days and after the seal (F) Projected date of completion of design strength is reached, provided at each set of seals; least one sample is taken at each set of (G) Supplemental roof support inby seals at least every 7 days. and outby each seal; (2) The mine operator shall evaluate (H) Water flow estimation and di- the atmosphere in the sealed area to mensions of the water drainage system determine whether sampling through through the seals; the sampling pipes in seals and ap- (I) Methods to ventilate the outby proved locations provides appropriate face of seals once completed; sampling locations of the sealed area. (J) Methods and materials used to The mine operator shall make the eval- maintain each type of seal; uation immediately after the minimum (K) Methods to address shafts and 14-day required sampling, if the mine boreholes in the sealed area; ventilation system is reconfigured, if (L) Assessment of potential for over- changes occur that adversely affect the pressures greater than 120 psi in sealed sealed area, or if the District Manager area; requests an evaluation. When the re- (M) Additional sampling locations; sults of the evaluations indicate the and need for additional sampling locations, (N) Additional information required the mine operator shall provide the ad- by the District Manager. ditional locations and have them ap- [73 FR 21206, Apr. 18, 2008, as amended at 80 proved in the ventilation plan. The Dis- FR 52982, Sept. 2, 2015] trict Manager may require additional sampling locations and frequencies in § 75.336 Sampling and monitoring re- the ventilation plan. quirements. (3) Mine operators with an approved (a) A certified person as defined in ventilation plan addressing sponta- § 75.100 shall monitor atmospheres of neous combustion pursuant to § 75.334(f)

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shall sample the sealed atmosphere in the mine operator shall have a ventila- accordance with the ventilation plan. tion plan revision approved by the Dis- (4) The District Manager may ap- trict Manager specifying the actions to prove in the ventilation plan the use of be taken. a continuous monitoring system in lieu (d) In sealed areas with a dem- of monitoring provisions in this sec- onstrated history of carbon dioxide or tion. sealed areas where inert gases have (b)(1) Except as provided in § 75.336(d), been injected, the operator may re- the atmosphere in the sealed area is quest that the District Manager ap- considered inert when the oxygen con- prove in the ventilation plan an alter- centration is less than 10.0 percent or native method to determine if the the methane concentration is less than sealed atmosphere is inert and when 3.0 percent or greater than 20.0 percent. miners have to be withdrawn. The mine (2) Immediate action shall be taken operator shall address in the ventila- by the mine operator to restore an tion plan the specific levels of meth- inert sealed atmosphere behind seals ane, carbon dioxide, nitrogen and oxy- with strengths less than 120 psi. Until gen; the sampling methods and equip- the atmosphere in the sealed area is re- ment used; and the methods to evalu- stored to an inert condition, the sealed ate these concentrations underground atmosphere shall be monitored at each at the seal. sampling pipe and approved location at least once every 24 hours. (e) Recordkeeping. (1) The certified (c) Except as provided in § 75.336(d), person shall promptly record each sam- when a sample is taken from the sealed pling result including the location of atmosphere with seals of less than 120 the sampling points, whether ingassing psi and the sample indicates that the or outgassing, and oxygen and methane oxygen concentration is 10 percent or concentrations. The results of oxygen greater and methane is between 4.5 per- and methane samples shall be recorded cent and 17 percent, the mine operator as the percentage of oxygen and meth- shall immediately take an additional ane measured by the certified person sample and then immediately notify and any hazardous condition found in the District Manager. When the addi- accordance with § 75.363. tional sample indicates that the oxy- (2) The mine operator shall retain gen concentration is 10 percent or sampling records at the mine for at greater and methane is between 4.5 per- least one year from the date of the cent and 17 percent, persons shall be sampling. withdrawn from the affected area [73 FR 21207, Apr. 18, 2008; 73 FR 27730, May which is the entire mine or other af- 14, 2008] fected area identified by the operator and approved by the District Manager § 75.337 Construction and repair of in the ventilation plan, except those seals. persons referred to in § 104(c) of the (a) The mine operator shall maintain Act. The operator may identify areas and repair seals to protect miners from in the ventilation plan to be approved hazards of sealed areas. by the District Manager where persons may be exempted from withdrawal. The (b) Prior to sealing, the mine oper- operator’s request shall address the lo- ator shall— cation of seals in relation to: Areas (1) Remove insulated cables, bat- where persons work and travel in the teries, and other potential electric ig- mine; escapeways and potential for nition sources from the area to be damage to the escapeways; and ventila- sealed when constructing seals, unless tion systems and controls in areas it is not safe to do so. If ignition where persons work or travel and sources cannot safely be removed, seals where ventilation is used for must be constructed to at least 120 psi; escapeways. The operator’s request (2) Remove metallic objects through shall also address the gas concentra- or across seals; and tion of other sampling locations in the (3) Breach or remove all stoppings in sealed area and other required informa- the first crosscut inby the seals imme- tion. Before miners reenter the mine, diately prior to sealing the area.

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(c) A certified person designated by feet of a seal. An operator may request the mine operator shall directly super- a different location in the ventilation vise seal construction and repair and— plan to be approved by the District (1) Examine each seal site imme- Manager. The operator’s request must diately prior to construction or repair address methods the mine operator will to ensure that the site is in accordance use to continuously monitor atmos- with the approved ventilation plan; pheric conditions in the sealed area (2) Examine each seal under con- during welding or burning; the airflow struction or repair during each shift to conditions in and around the work ensure that the seal is being con- area; the rock dust and water applica- structed or repaired in accordance with tion methods; the availability of fire the approved ventilation plan; extinguishers on hand; the procedures (3) Examine each seal upon comple- to maintain safe conditions, and other tion of construction or repair to ensure relevant factors. that construction or repair is in ac- (g) Sampling pipes. (1) For seals con- cordance with the approved ventilation structed after April 18, 2008, one non- plan; metallic sampling pipe shall be in- (4) Certify by initials, date, and time stalled in each seal that shall extend that the examinations were made; and into the center of the first connecting (5) Make a record of the examination crosscut inby the seal. If an open cross- at the completion of any shift during cut does not exist, the sampling pipe which an examination was conducted. shall extend one-half of the distance of The record shall include each defi- the open entry inby the seal. ciency and the corrective action taken. (2) Each sampling pipe shall be The record shall be countersigned by equipped with a shut-off valve and ap- the mine foreman or equivalent mine propriate fittings for taking gas sam- official by the end of the mine fore- ples. man’s or equivalent mine official’s (3) The sampling pipes shall be la- next regularly scheduled working shift. beled to indicate the location of the The record shall be kept at the mine sampling point when more than one for one year. sampling pipe is installed through a (d) Upon completion of construction seal. of each seal a senior mine management (4) If a new seal is constructed to re- official, such as a mine manager or su- place or reinforce an existing seal with perintendent, shall certify that the a sampling pipe, the sampling pipe in construction, installation, and mate- the existing seal shall extend through rials used were in accordance with the the new seal. An additional sampling approved ventilation plan. The mine pipe shall be installed through each operator shall retain the certification new seal to sample the area between for as long as the seal is needed to seals, as specified in the approved ven- serve the purpose for which it was tilation plan. built. (h) Water drainage system. For each (e) The mine operator shall— set of seals constructed after April 18, (1) Notify the District Manager be- 2008, the seal at the lowest elevation tween two and fourteen days prior to shall have a corrosion-resistant, non- commencement of seal construction; metallic water drainage system. Seals (2) Notify the District Manager, in shall not impound water or slurry. writing, within five days of completion Water or slurry shall not accumulate of a set of seals and provide a copy of within the sealed area to any depth the certification required in paragraph that can adversely affect a seal. (d) of this section; and (3) Submit a copy of quality control [73 FR 21207, Apr. 18, 2008] results to the District Manager for seal material properties specified by § 75.335 § 75.338 Training. within 30 days of completion of quality (a) Certified persons conducting sam- control tests. pling shall be trained in the use of ap- (f) Welding, cutting, and soldering. propriate sampling equipment, proce- Welding, cutting, and soldering with an dures, location of sampling points, fre- arc or flame are prohibited within 150 quency of sampling, size and condition

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of the sealed area, and the use of con- sign and ventilation plan. The mine op- tinuous monitoring systems if applica- erator shall certify the date of training ble before they conduct sampling, and provided each miner, certified person, annually thereafter. The mine operator and senior mine management official shall certify the date of training pro- and retain each certification for two vided to certified persons and retain years. each certification for two years. (b) Miners constructing or repairing [73 FR 21208, Apr. 18, 2008] seals, designated certified persons, and senior mine management officials shall § 75.339 Seals records. be trained prior to constructing or re- (a) The table entitled ‘‘Seal Record- pairing a seal and annually thereafter. keeping Requirements’’ lists records The training shall address materials the operator shall maintain and the re- and procedures in the approved seal de- tention period for each record.

TABLE—§ 75.339(a) SEAL RECORDKEEPING REQUIREMENTS

Record Section reference Retention time

(1) Approved seal design ...... 75.335(c)(1) ...... As long as the seal is needed to serve the purpose for which it is built. (2) Certification of Provisions of Approved Seal 75.335(c)(2) ...... As long as the seal is needed to serve the pur- Design is Addressed. pose for which it is built. (3) Gas sampling records ...... 75.336(e)(2) ...... 1 year. (4) Record of examinations ...... 75.337(c)(5) ...... 1 year. (5) Certification of seal construction, installation, 75.337(d) ...... As long as the seal is needed to serve the pur- and materials. pose for which it is built. (6) Certification of Training for Persons that Sam- 75.338(a) ...... 2 years. ple. (7) Certification of Training for Persons that Per- 75.338(b) ...... 2 years. form Seal Construction and Repair.

(b) Records required by §§ 75.335, § 75.340 Underground electrical instal- 75.336, 75.337 and 75.338 shall be retained lations. at a surface location at the mine in a (a) Underground transformer sta- secure book that is not susceptible to tions, battery charging stations, sub- alteration. The records may be re- stations, rectifiers, and water pumps tained electronically in a computer shall be housed in noncombustible system that is secure and not suscep- structures or areas or be equipped with tible to alteration, if the mine operator a fire suppression system meeting the can immediately access the record requirements of § 75.1107–3 through from the mine site. § 75.1107–16. (c) Upon request from an authorized (1) When a noncombustible structure representative of the Secretary of or area is used, these installations Labor, the Secretary of Health and shall be— Human Services, or from the author- (i) Ventilated with intake air that is ized representative of miners, mine op- coursed into a return air course or to erators shall promptly provide access the surface and that is not used to ven- to any record listed in the table in this tilate working places; or section. (ii) Ventilated with intake air that is (d) Whenever an operator ceases to do monitored for carbon monoxide or smoke by an AMS installed and oper- business or transfers control of the ated according to § 75.351. Monitoring of mine to another entity, that operator intake air ventilating battery charging shall transfer all records required to be stations shall be done with sensors not maintained by this part, or a copy affected by hydrogen; or thereof, to any successor operator who (iii) Ventilated with intake air and shall maintain them for the required equipped with sensors to monitor for period. heat and for carbon monoxide or [73 FR 21208, Apr. 18, 2008] smoke. Monitoring of intake air ventilating battery charging stations shall

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be done with sensors not affected by (b) Thermal overload devices shall hydrogen. The sensors shall deenergize protect the blower motor from over- power to the installation, activate a heating. visual and audible alarm located out- (c) The fuel supply shall turn off side of and on the intake side of the en- automatically if a flame-out occurs. closure, and activate doors that will (d) Each heater shall be located or automatically close when either of the guarded to prevent contact by persons following occurs: and shall be equipped with a screen at (A) The temperature in the non- the inlet to prevent combustible mate- combustible structure reaches 165 °F; rials from passing over the burner or units. (B) The carbon monoxide concentra- (e) If intake air heaters use liquefied tion reaches 10 parts per million above fuel systems— the ambient level for the area, or the (1) Hydrostatic relief valves installed optical density of smoke reaches 0.022 on vaporizers and on storage tanks per meter. At least every 31 days, sen- shall be vented; and sors installed to monitor for carbon (2) Fuel storage tanks shall be lo- monoxide shall be calibrated with a cated or protected to prevent fuel from known concentration of carbon mon- leaking into the mine. oxide and air sufficient to activate the (f) Following any period of 8 hours or closing door, or each smoke sensor more during which a heater does not shall be tested to determine that it operate, the heater and its associated functions correctly. components shall be examined within (2) When a fire suppression system is its first hour of operation. Addition- used, these installations shall be— ally, each heater and its components (i) Ventilated with intake air that is shall be examined at least once each coursed into a return air course or to shift that the heater operates. The ex- the surface and that is not used to ven- amination shall include measurement tilate working places; or of the carbon monoxide concentration (ii) Ventilated with intake air that is at the bottom of each shaft, slope, or in monitored for carbon monoxide or the drift opening where air is being smoke by an AMS installed and oper- heated. The measurements shall be ated according to § 75.351. Monitoring of taken by a person designated by the intake air ventilating battery charging operator or by a carbon monoxide sen- stations shall be done with sensors not sor that is calibrated with a known affected by hydrogen. concentration of carbon monoxide and (b) This section does not apply to— air at least once every 31 days. When the carbon monoxide concentration at (1) Rectifiers and power centers with this location reaches 50 parts per mil- transformers that are either dry-type lion, the heater causing the elevated or contain nonflammable liquid, if they carbon monoxide level shall be shut are located at or near the section and down. are moved as the working section advances or retreats; § 75.342 Methane monitors. (2) Submersible pumps; (a)(1) MSHA approved methane mon- (3) Permissible pumps and associated itors shall be installed on all face cut- permissible switchgear; ting machines, continuous miners, (4) Pumps located on or near the sec- longwall face equipment, loading mation and that are moved as the working chines, and other mechanized equip- section advances or retreats; ment used to extract or load coal with- (5) Pumps installed in anthracite in the working place. mines; and (2) The sensing device for methane (6) Small portable pumps. monitors on longwall shearing machines shall be installed at the return § 75.341 Direct-fired intake air heaters. air end of the longwall face. An addi- (a) If any system used to heat intake tional sensing device also shall be in- air malfunctions, the heaters affected stalled on the longwall shearing ma- shall switch off automatically. chine, downwind and as close to the

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cutting head as practicable. An alter- § 75.343 Underground shops. native location or locations for the (a) Underground shops shall be sensing device required on the longwall equipped with an automatic fire sup- shearing machine may be approved in pression system meeting the require- the ventilation plan. ments of § 75.1107–3 through § 75.1107–16, (3) The sensing devices of methane or be enclosed in a noncombustible monitors shall be installed as close to structure or area. the working face as practicable. (b) Underground shops shall be venti- (4) Methane monitors shall be main- lated with intake air that is coursed di- tained in permissible and proper oper- rectly into a return air course. ating condition and shall be calibrated with a known air-methane mixture at § 75.344 Compressors. least once every 31 days. To assure that (a) Except compressors that are com- methane monitors are properly main- ponents of equipment such as loco- tained and calibrated, the operator motives and rock dusting machines and shall: compressors of less than 5 horsepower, (i) Use persons properly trained in electrical compressors including those the maintenance, calibration, and per- that may start automatically shall be: missibility of methane monitors to (1) Continuously attended by a per- calibrate and maintain the devices. son designated by the operator who can (ii) Maintain a record of all calibra- see the compressor at all times during tion tests of methane monitors. its operation. Any designated person Records shall be maintained in a secure attending the compressor shall be ca- book that is not susceptible to alter- pable of activating the fire suppression ation or electronically in a computer system and deenergizing or shutting- off the compressor in the event of a system so as to be secure and not sus- fire; or, ceptible to alteration. (2) Enclosed in a noncombustible (iii) Retain the record of calibration structure or area which is ventilated tests for 1 year from the date of the by intake air coursed directly into a test. Records shall be retained at a sur- return air course or to the surface and face location at the mine and made equipped with sensors to monitor for available for inspection by authorized heat and for carbon monoxide or representatives of the Secretary and smoke. The sensors shall deenergize the representative of miners. power to the compressor, activate a (b)(1) When the methane concentra- visual and audible alarm located out- tion at any methane monitor reaches side of and on the intake side of the en- 1.0 percent the monitor shall give a closure, and activate doors to auto- warning signal. matically enclose the noncombustible (2) The warning signal device of the structure or area when either of the methane monitor shall be visible to a following occurs: person who can deenergize electric (i) The temperature in the non- equipment or shut down diesel-powered combustible structure or area reaches equipment on which the monitor is 165 °F. mounted. (ii) The carbon monoxide concentra- (c) The methane monitor shall auto- tion reaches 10 parts per million above matically deenergize electric equip- the ambient level for the area, or the ment or shut down diesel-powered optical density of smoke reaches 0.022 equipment on which it is mounted per meter. At least once every 31 days, when— sensors installed to monitor for carbon (1) The methane concentration at monoxide shall be calibrated with a any methane monitor reaches 2.0 per- known concentration of carbon monoxide and air sufficient to activate the cent; or closing door, and each smoke sensor (2) The monitor is not operating shall be tested to determine that it properly. functions correctly. [61 FR 9829, Mar. 11, 1996, as amended at 61 (b) Compressors, except those ex- FR 55527, Oct. 25, 1996] empted in paragraph (a), shall be

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equipped with a heat activated fire sup- ated, examined, and maintained as pression system meeting the require- specified in § 75.351. ments of 75.1107–3 through 75.1107–16. (2) All miners must be trained annu- (c) Two portable fire extinguishers or ally in the basic operating principles of one extinguisher having at least twice the AMS, including the actions re- the minimum capacity specified for a quired in the event of activation of any portable fire extinguisher in § 75.1100– AMS alert or alarm signal. This train- 1(e) shall be provided for each coming must be conducted prior to working pressor. underground in a mine that uses belt (d) Notwithstanding the require- air to ventilate working sections or ments of § 75.1107–4, upon activation of areas where mechanized mining equip- any fire suppression system used under ment is installed or removed. It must paragraph (b) of this section, the com- be conducted as part of a miner’s 30 pressor shall be automatically deener- CFR part 48 new miner training (§ 48.5), gized or automatically shut off. experienced miner training (§ 48.6), or [61 FR 9829, Mar. 11, 1996, as amended at 61 annual refresher training (§ 48.8). FR 55527, Oct. 25, 1996] (3)(i) The average concentration of respirable dust in the belt air course, § 75.350 Belt air course ventilation. when used as a section intake air (a) The belt air course must not be course, shall be maintained at or used as a return air course; and except below: as provided in paragraph (b) of this sec- (A) 1.0 mg/m3. tion, the belt air course must not be (B) 0.5 mg/m3 as of August 1, 2016. used to provide air to working sections (ii) Where miners on the working sec- or to areas where mechanized mining tion are on a reduced standard below equipment is being installed or re- that specified in § 75.350(b)(3)(i), the av- moved. erage concentration of respirable dust (1) The belt air course must be sepa- in the belt entry must be at or below rated with permanent ventilation con- the lowest applicable standard on that trols from return air courses and from section. other intake air courses except as pro- (iii) A permanent designated area vided in paragraph (c) of this section. (DA) for dust measurements must be (2) Effective December 31, 2009, the established at a point no greater than air velocity in the belt entry must be 50 feet upwind from the section loading at least 50 feet per minute. When re- point in the belt entry when the belt quested by the mine operator, the dis- air flows over the loading point or no trict manager may approve lower ve- greater than 50 feet upwind from the locities in the ventilation plan based point where belt air is mixed with air on specific mine conditions. Air veloci- from another intake air course near ties must be compatible with all fire the loading point. The DA must be detection systems and fire suppression specified and approved in the ventila- systems used in the belt entry. tion plan. (b) The use of air from a belt air (4) The primary escapeway must be course to ventilate a working section, monitored for carbon monoxide or or an area where mechanized mining smoke as specified in § 75.351(f). equipment is being installed or re- (5) The area of the mine with a belt moved, shall be permitted only when air course must be developed with evaluated and approved by the district three or more entries. manager in the mine ventilation plan. (6) In areas of the mine developed The mine operator must provide jus- after the effective date of this rule, un- tification in the plan that the use of less approved by the district manager, air from a belt entry would afford at no more than 50% of the total intake least the same measure of protection air, delivered to the working section or as where belt haulage entries are not to areas where mechanized mining used to ventilate working places. In ad- equipment is being installed or re- dition, the following requirements moved, can be supplied from the belt must be met: air course. The locations for measuring (1) The belt entry must be equipped these air quantities must be approved with an AMS that is installed, oper- in the mine ventilation plan.

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(7) The air velocity in the belt entry (5) The location(s) and use of a point- must be at least 100 feet per minute. feed regulator(s) must be approved in When requested by the mine operator, the mine ventilation plan and shown the district manager may approve on the mine ventilation map; and lower velocities in the ventilation plan (6) An AMS must be installed, oper- based on specific mine conditions. ated, examined, and maintained as (8) The air velocity in the belt entry specified in § 75.351. must not exceed 1,000 feet per minute. [69 FR 17526, Apr. 2, 2004, as amended at 70 When requested by the mine operator, FR 37266, June 29, 2005; 71 FR 12269, Mar. 9, the district manager may approve 2006; 73 FR 80612, Dec. 31, 2008; 79 FR 24987, higher velocities in the ventilation May 1, 2014] plan based on specific mine conditions. (c) Notwithstanding the provisions of § 75.351 Atmospheric monitoring systems. § 75.380(g), additional intake air may be added to the belt air course through a (a) AMS operation. Whenever per- point-feed regulator. The location and sonnel are underground and an AMS is use of point feeds must be approved in used to fulfill the requirements of the mine ventilation plan. §§ 75.323(d)(1)(ii), 75.340(a)(1)(ii), (d) If the air through the point-feed 75.340(a)(2)(ii), 75.350(b), 75.350(d), or regulator enters a belt air course which 75.362(f), the AMS must be operating is used to ventilate a working section and a designated AMS operator must or an area where mechanized mining be on duty at a location on the surface equipment is being installed or re- of the mine where audible and visual signals from the AMS must be seen or moved, the following conditions must heard and the AMS operator can be met: promptly respond to these signals. (1) The air current that will pass (b) Designated surface location and through the point-feed regulator must AMS operator. When an AMS is used to be monitored for carbon monoxide or comply with §§ 75.323(d)(1)(ii), smoke at a point within 50 feet upwind 75.340(a)(1)(ii), 75.340(a)(2)(ii), 75.350(b), of the point-feed regulator. A second 75.350(d), or 75.362(f), the following re- point must be monitored 1,000 feet quirements apply: upwind of the point-feed regulator un- (1) The mine operator must designate less the mine operator requests that a a surface location at the mine where lesser distance be approved by the dis- signals from the AMS will be received trict manager in the mine ventilation and two-way voice communication is plan based on mine specific conditions; maintained with each working section, (2) The air in the belt air course must with areas where mechanized mining be monitored for carbon monoxide or equipment is being installed or re- smoke upwind of the point-feed regu- moved, and with other areas designated lator. This sensor must be in the belt in the approved emergency evacuation air course within 50 feet of the mixing and firefighting program of instruction point where air flowing through the (§ 75.1502). point-feed regulator mixes with the (2) The mine operator must designate belt air; an AMS operator to monitor and (3) The point-feed regulator must be promptly respond to all AMS signals. provided with a means to close the reg- The AMS operator must have as a pri- ulator from the intake air course with- mary duty the responsibility to mon- out requiring a person to enter the itor the malfunction, alert and alarm crosscut where the point-feed regulator signals of the AMS, and to notify ap- is located. The point-feed regulator propriate personnel of these signals. In must also be provided with a means to the event of an emergency, the sole reclose the regulator from a location in sponsibility of the AMS operator shall the belt air course immediately upwind be to respond to the emergency. of the crosscut containing the point- (3) A map or schematic must be pro- feed regulator; vided at the designated surface loca- (4) A minimum air velocity of 300 feet tion that shows the locations and type per minute must be maintained of AMS sensor at each location, and through the point-feed regulator; the intended air flow direction at these

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locations. This map or schematic must struction (§ 75.1502) when the carbon be updated within 24 hours of any monoxide, smoke, or methane con- change in this information. centration at any sensor reaches the (4) The names of the designated AMS alarm level as specified in § 75.351(i). operators and other appropriate per- These signals must be seen or heard by sonnel, including the designated person miners working at these locations. responsible for initiating an emergency Methane alarms must be distinguish- mine evacuation under § 75.1501, and able from other signals. the method to contact these persons, (6) Identify at the designated surface must be provided at the designated sur- location the operational status of all face location. sensors. (c) Minimum operating requirements. (7) Automatically provide visual and AMSs used to comply with audible alarm signals at the designated §§ 75.323(d)(1)(ii), 75.340(a)(1)(ii), surface location, at all affected work- 75.340(a)(2)(ii), 75.350(b), 75.350(d), or ing sections, and at all affected areas 75.362(f) must: where mechanized mining equipment is (1) Automatically provide visual and being installed or removed when the audible signals at the designated sur- carbon monoxide level at any two con- face location for any interruption of secutive sensors alert at the same circuit continuity and any electrical time. These signals must be seen or malfunction of the system. These sig- heard by the AMS operator and miners nals must be of sufficient magnitude to working at these locations. be seen or heard by the AMS operator. (d) Location and installation of AMS (2) Automatically provide visual and sensors. (1) All AMS sensors, as speci- audible signals at the designated sur- fied in §§ 75.351(e) through 75.351(h), face location when the carbon mon- must be located such that measure- oxide concentration or methane con- ments are representative of the mine centration at any sensor reaches the atmosphere in these locations. alert level as specified in § 75.351(i). These signals must be of sufficient (2) Carbon monoxide or smoke sen- magnitude to be seen or heard by the sors must be installed near the center AMS operator. in the upper third of the entry, in a lo- (3) Automatically provide visual and cation that does not expose personnel audible signals at the designated sur- working on the system to unsafe condi- face location distinguishable from tions. Sensors must not be located in alert signals when the carbon mon- abnormally high areas or in other loca- oxide, smoke, or methane concentrations where air flow patterns do not tion at any sensor reaches the alarm permit products of combustion to be level as specified in § 75.351(i). These carried to the sensors. signals must be of sufficient magnitude (3) Methane sensors must be installed to be seen or heard by the AMS oper- near the center of the entry, at least 12 ator. inches from the roof, ribs, and floor, in (4) Automatically provide visual and a location that would not expose per- audible signals at all affected working sonnel working on the system to un- sections and at all affected areas where safe conditions. mechanized mining equipment is being (e) Location of sensors-belt air course. installed or removed when the carbon (1) In addition to the requirements of monoxide, smoke, or methane con- paragraph (d) of this section, any AMS centration at any sensor reaches the used to monitor belt air courses under alarm level as specified in § 75.351(i). § 75.350(b) must have approved sensors These signals must be of sufficient to monitor for carbon monoxide at the magnitude to be seen or heard by min- following locations: ers working at these locations. Meth- (i) At or near the working section ane signals must be distinguishable belt tailpiece in the air stream ven- from other signals. tilating the belt entry. In longwall (5) Automatically provide visual and mining systems the sensor must be lo- audible signals at other locations as cated upwind in the belt entry at a dis- specified in Mine Emergency Evacu- tance no greater than 150 feet from the ation and Firefighting Program of In- mixing point where intake air is mixed

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with the belt air at or near the tail- (iii) At intervals not to exceed 3,000 piece; feet along each belt entry. (ii) No more than 50 feet upwind from (iv) This provision shall be effective the point where the belt air course is one year after the Secretary has deter- combined with another air course or mined that a smoke sensor is available splits into multiple air courses; to reliably detect fire in underground (iii) At intervals not to exceed 1,000 coal mines. feet along each belt entry. However, in (f) Locations of sensors—the primary areas along each belt entry where air escapeway. When used to monitor the velocities are between 50 and 100 feet primary escapeway under § 75.350(b)(4), per minute, spacing of sensors must carbon monoxide or smoke sensors not exceed 500 feet. In areas along each must be located in the primary belt entry where air velocities are less escapeway within 500 feet of the work- than 50 feet per minute, the sensor ing section and areas where mecha- spacing must not exceed 350 feet; nized mining equipment is being in- (iv) Not more than 100 feet downwind stalled or removed. In addition, an- of each belt drive unit, each tailpiece, other sensor must be located within 500 transfer point, and each belt take-up. If feet inby the beginning of the panel. the belt drive, tailpiece, and/or take-up The point-feed sensor required by for a single transfer point are installed § 75.350(d)(1) may be used as the sensor together in the same air course, and at the beginning of the panel if it is lo- the distance between the units is less cated within 500 feet inby the begin- than 100 feet, they may be monitored ning of the panel. with one sensor downwind of the last (g) Location of sensors—return air component. If the distance between the splits. (1) If used to monitor return air units exceeds 100 feet, additional sen- splits under § 75.362(f), a methane sensors are required downwind of each belt sor must be installed in the return air drive unit, each tailpiece, transfer split between the last working place, point, and each belt take-up; and longwall or shortwall face ventilated (v) At other locations in any entry by that air split, and the junction of that is part of the belt air course as re- the return air split with another air quired and specified in the mine ven- split, seal, or worked out area. tilation plan. (2) If used to monitor a return air (2) Smoke sensors must be installed split under § 75.323(d)(1)(ii), the meth- to monitor the belt entry under ane sensors must be installed at the § 75.350(b) at the following locations: following locations: (i) At or near the working section (i) In the return air course opposite belt tailpiece in the air stream ven- the section loading point, or, if ex- tilating the belt entry. In longwall hausting auxiliary fan(s) are used, in mining systems the sensor must be lo- the return air course no closer than 300 cated upwind in the belt entry at a dis- feet downwind from the fan exhaust tance no greater than 150 feet from the and at a point opposite or immediately mixing point where intake air is mixed outby the section loading point; and with the belt air at or near the tail- (ii) Immediately upwind from the lo- piece; cation where the return air split meets (ii) Not more than 100 feet downwind another air split or immediately of each belt drive unit, each tailpiece upwind of the location where an air transfer point, and each belt take-up. If split is used to ventilate seals or the belt drive, tailpiece, and/or take-up worked-out areas. for a single transfer point are installed (h) Location of sensors—electrical in- together in the same air course, and stallations. When monitoring the intake the distance between the units is less air ventilating underground trans- than 100 feet, they may be monitored former stations, battery charging sta- with one sensor downwind of the last tions, substations, rectifiers, or water component. If the distance between the pumps under § 75.340(a)(1)(ii) or units exceeds 100 feet, additional sen- § 75.340(a)(2)(ii), at least one sensor sors are required downwind of each belt must be installed to monitor the mine drive unit, each tailpiece, transfer atmosphere for carbon monoxide or point, and each belt take-up; and smoke, located downwind and not

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greater than 50 feet from the electrical techniques or methods which eliminate installation being monitored. or reduce the need for time delays, (i) Establishing alert and alarm levels. must be specified and approved in the An AMS installed in accordance with mine ventilation plan. the following paragraphs must initiate (n) Examination, testing, and calibra- alert and alarm signals at the specified tion. (1) At least once each shift when levels, as indicated: belts are operated as part of a produc- (1) For § 75.323(d)(1)(ii) alarm at 1.5% tion shift, sensors used to detect car- methane. bon monoxide or smoke in accordance (2) For §§ 75.340(a)(1)(ii), with §§ 75.350(b), and 75.350(d), and 75.340(a)(2)(ii), 75.350(b), and 75.350(d), alarms installed in accordance with alert at 5 ppm carbon monoxide above § 75.350(b) must be visually examined. the ambient level and alarm at 10 ppm (2) At least once every seven days, carbon monoxide above the ambient alarms for AMS installed in accordance level when carbon monoxide sensors with §§ 75.350(b), and 75.350(d) must be are used; and alarm at a smoke optical functionally tested for proper oper- density of 0.022 per meter when smoke ation. sensors are used. Reduced alert and (3) At intervals not to exceed 31 alarm settings approved by the district days— manager may be required for carbon (i) Each carbon monoxide sensor in- monoxide sensors identified in the stalled in accordance with mine ventilation plan, § 75.371(nn). §§ 75.340(a)(1)(ii), 75.340(a)(2)(ii), (3) For § 75.362(f), alert at 1.0% meth- 75.350(b), or 75.350(d) must be calibrated ane and alarm at 1.5% methane. in accordance with the manufacturer’s (j) Establishing carbon monoxide ambi- calibration specifications. Calibration ent levels. Carbon monoxide ambient must be done with a known concentra- levels and the means to determine tion of carbon monoxide in air suffi- these levels must be approved in the cient to activate the alarm; mine ventilation plan (§ 75.371(hh)) for (ii) Each smoke sensor installed in monitors installed in accordance with accordance with §§ 75.340(a)(1)(ii), §§ 75.340(a)(1)(ii), 75.340(a)(2)(ii), 75.340(a)(2)(ii), 75.350(b), or 75.350(d) 75.350(b), and 75.350(d). must be functionally tested in accord- (k) Installation and maintenance. An ance with the manufacturer’s calibra- AMS installed in accordance with tion specifications; §§ 75.323(d)(1)(ii), 75.340(a)(1)(ii), (iii) Each methane sensor installed in 75.340(a)(2)(ii), 75.350(b), 75.350(d), or accordance with §§ 75.323(d)(1)(ii) or 75.362(f) must be installed and main- 75.362(f) must be calibrated in accord- tained by personnel trained in the in- ance with the manufacturer’s calibra- stallation and maintenance of the sys- tion specifications. Calibration must tem. The system must be maintained be done with a known concentration of in proper operating condition. methane in air sufficient to activate an (l) Sensors. Sensors used to monitor alarm. for carbon monoxide, methane, and (iv) If the alert or alarm signals will smoke must be either of a type listed be activated during calibration of sen- and installed in accordance with the sors, the AMS operator must be noti- recommendations of a nationally rec- fied prior to and upon completion of ognized testing laboratory approved by calibration. The AMS operator must the Secretary; or these sensors must be notify miners on affected working sec- of a type, and installed in a manner, tions, areas where mechanized mining approved by the Secretary. equipment is being installed or re- (m) Time delays. When a dem- moved, or other areas designated in the onstrated need exists, time delays may approved emergency evacuation and be incorporated into the AMS. These firefighting program of instruction time delays must only be used to ac- (§ 75.1502) when calibration will acti- count for non-fire related carbon mon- vate alarms and when calibration is oxide alert and alarm sensor signals. completed. These time delays are limited to no (4) Gases used for the testing and more than three minutes. The use and calibration of AMS sensors must be length of any time delays, or other traceable to the National Institute of

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Standards and Technology reference (iii) The mine emergency evacuation standard for the specific gas. When and firefighting program of instruc- these reference standards are not avail- tion; able for a specific gas, calibration (iv) The mine ventilation system in- gases must be traceable to an analyt- cluding planned air directions; ical standard which is prepared using a (v) Appropriate response to alert, method traceable to the National Insti- alarm and malfunction signals; tute of Standards and Technology. (vi) Use of mine communication sys- Calibration gases must be within ±2.0 tems including emergency notification percent of the indicated gas concentra- procedures; and tion. (vii) AMS recordkeeping require- (o) Recordkeeping. (1) When an AMS is ments. used to comply with §§ 75.323(d)(1)(ii), (2) At least once every six months, 75.340(a)(1)(ii), 75.340(a)(2)(ii), 75.350(b), all AMS operators must travel to all 75.350(d), or 75.362(f), individuals des- working sections. ignated by the operator must make the (3) A record of the content of train- following records by the end of the ing, the person conducting the train- shift in which the following event(s) ing, and the date the training was con- occur: ducted, must be maintained at the (i) If an alert or alarm signal occurs, mine for at least one year by the mine a record of the date, time, location and operator. type of sensor, and the cause for the (r) Communications. When an AMS is activation. used to comply with § 75.350(b), a two- (ii) If an AMS malfunctions, a record way voice communication system re- of the date, the extent and cause of the quired by § 75.1600 must be installed in malfunction, and the corrective action an entry that is separate from the taken to return the system to proper entry in which the AMS is installed no operation. later than August 2, 2004. The two-way (iii) A record of the seven-day tests of voice communication system may be alert and alarm signals; calibrations; installed in the entry where the intake and maintenance of the AMS must be sensors required by §§ 75.350(b)(4) or made by the person(s) performing these 75.350(d)(1) are installed. actions. [69 FR 17527, Apr. 2, 2004, as amended at 73 (2) The person entering the record FR 80612, Dec. 31, 2008] must include their name, date, and signature in the record. § 75.352 Actions in response to AMS (3) The records required by this sec- malfunction, alert, or alarm signals. tion must be kept either in a secure (a) When a malfunction, alert, or book that is not susceptible to alter- alarm signal is received at the des- ation, or electronically in a computer ignated surface location, the sensor(s) system that is secure and not suscep- that are activated must be identified tible to alteration. These records must and the AMS operator must promptly be maintained separately from other notify appropriate personnel. records and identifiable by a title, such (b) Upon notification of a malfunc- as the ‘AMS log.’ tion, alert, or alarm signal, appropriate (p) Retention period. Records must be personnel must promptly initiate an retained for at least one year at a sur- investigation to determine the cause of face location at the mine and made the signal and take the required ac- available for inspection by miners and tions set forth in paragraphs (c), (d), or authorized representatives of the Sec- (e) of this section. retary. (c) If any sensor installed in accord- (q) Training. (1) All AMS operators ance with §§ 75.340(a)(1)(ii), must be trained annually in the proper 75.340(a)(2)(ii), 75.350(b), or 75.350(d) in- operation of the AMS. This training dicates an alarm or if any two consecu- must include the following subjects: tive sensors indicate alert at the same (i) Familiarity with underground time, the following procedures must be mining systems; followed unless the cause of the sig- (ii) Basic atmospheric monitoring nal(s) is known not to be a hazard to system requirements; miners:

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(1) Appropriate personnel must notify diately to the AMS operator any con- miners in affected working sections, in centration of the contaminant that affected areas where mechanized min- reaches either the alert or alarm level ing equipment is being installed or re- specified in § 75.351(i), or the alternate moved, and at other locations specified alert and alarm levels specified in in the § 75.1502 approved mine emer- paragraph (e)(7) of this section, unless gency evacuation and firefighting pro- the source of the contaminant is gram of instruction; and known not to present a hazard. (2) All personnel in the affected (6) Detectors used to monitor under areas, unless assigned other duties this section must have a level of de- under § 75.1502, must be withdrawn tectability equal to that required of promptly to a safe location identified the sensors in § 75.351(l). in the mine emergency evacuation and (7) For those AMSs using sensors firefighting program of instruction. other than carbon monoxide sensors, (d) If there is an alert or alarm signal an alternate detector and the alert and from a methane sensor installed in ac- alarm levels associated with that de- cordance with §§ 75.323(d)(1)(ii) and tector must be specified in the ap- 75.362(f), an investigation must be initi- proved mine ventilation plan. ated to determine the cause of the sig- (f) If the minimum air velocity is not nal, and the actions required under maintained when required under § 75.323 must be taken. § 75.350(b)(7), immediate action must be (e) If any fire detection components taken to return the ventilation system of the AMS malfunction or are inoper- to proper operation. While the ventila- ative, immediate action must be taken tion system is being corrected, oper- to return the system to proper operation of the belt may continue only ation. While the AMS component re- while a trained person(s) patrols and pairs are being made, operation of the continuously monitors for carbon mon- belt may continue if the following con- oxide or smoke as set forth in ditions are met: §§ 75.352(e)(3) through (7), so that the af- (1) If one AMS sensor malfunctions or fected areas will be traveled each hour becomes inoperative, a trained person in their entirety. must continuously monitor for carbon (g) The AMS shall automatically pro- monoxide or smoke at the inoperative vide both a visual and audible signal in sensor. the belt entry at the point-feed regu- (2) If two or more adjacent AMS sen- lator location, at affected sections, and sors malfunction or become inoper- at the designated surface location ative, a trained person(s) must patrol when carbon monoxide concentrations and continuously monitor for carbon reach: monoxide or smoke so that the affected (1) The alert level at both point-feed areas will be traveled each hour in intake monitoring sensors; or their entirety, or a trained person (2) The alarm level at either point- must be stationed to monitor at each feed intake monitoring sensor. inoperative sensor. (3) If the complete AMS malfunctions [69 FR 17529, Apr. 2, 2004, as amended at 73 or becomes inoperative, trained per- FR 80613, Dec. 31, 2008] sons must patrol and continuously monitor for carbon monoxide or smoke § 75.360 Preshift examination at fixed so that the affected areas will be trav- intervals. eled each hour in their entirety. (a)(1) Except as provided in para- (4) The trained person(s) monitoring graph (a)(2) of this section, a certified under this section must, at a min- person designated by the operator must imum, have two-way voice communica- make a preshift examination within 3 tion capabilities with the AMS oper- hours preceding the beginning of any 8- ator at intervals not to exceed 2,000 hour interval during which any person feet and report contaminant levels to is scheduled to work or travel under- the AMS operator at intervals not to ground. No person other than certified exceed 60 minutes. examiners may enter or remain in any (5) The trained person(s) monitoring underground area unless a preshift ex- under this section must report imme- amination has been completed for the

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established 8-hour interval. The oper- areas if the intake air passing the ap- ator must establish 8-hour intervals of proaches is used to ventilate working time subject to the required preshift sections where anyone is scheduled to examinations. work during the oncoming shift. The (2) Preshift examinations of areas examination of the approaches to the where pumpers are scheduled to work worked-out areas shall be made in the or travel shall not be required prior to intake air course immediately inby the pumper entering the areas if the and outby each entry used to carry air pumper is a certified person and the into the worked-out area. An examina- pumper conducts an examination for tion of the entries used to carry air hazardous conditions and violations of into the worked-out areas shall be con- the mandatory health or safety stand- ducted at a point immediately inby the ards referenced in paragraph (b)(11) of intersection of each entry with the in- this section, tests for methane and ox- take air course. ygen deficiency, and determines if the (5) Seals along intake air courses air is moving in its proper direction in the area where the pumper works or where intake air passes by a seal to travels. The examination of the area ventilate working sections where any- must be completed before the pumper one is scheduled to work during the on- performs any other work. A record of coming shift. all hazardous conditions and violations (6)(i) Entries and rooms developed of the mandatory health or safety after November 15, 1992, and developed standards found by the pumper shall be more than 2 crosscuts off an intake air made and retained in accordance with course without permanent ventilation § 75.363 of this part. controls where intake air passes (b) The person conducting the through or by these entries or rooms to preshift examination shall examine for reach a working section where anyone hazardous conditions and violations of is scheduled to work during the oncom- the mandatory health or safety standing shift; and, ards referenced in paragraph (b)(11) of (ii) Entries and rooms developed this section, test for methane and oxy- after November 15, 1992, and driven gen deficiency, and determine if the air more than 20 feet off an intake air is moving in its proper direction at the course without a crosscut and without following locations: permanent ventilation controls where (1) Roadways, travelways and track intake air passes through or by these haulageways where persons are sched- entries or rooms to reach a working uled, prior to the beginning of the section where anyone is scheduled to preshift examination, to work or travel work during the oncoming shift. during the oncoming shift. (7) Areas where trolley wires or trol- (2) Belt conveyors that will be used ley feeder wires are to be or will re- to transport persons during the oncom- main energized during the oncoming ing shift and the entries in which these shift. belt conveyors are located. (8) High spots along intake air (3) Working sections and areas where mechanized mining equipment is being courses where methane is likely to ac- installed or removed, if anyone is cumulate, if equipment will be oper- scheduled to work on the section or in ated in the area during the shift. the area during the oncoming shift. (9) Underground electrical installa- The scope of the examination shall in- tions referred to in § 75.340(a), except clude the working places, approaches those pumps listed in § 75.340 (b)(2) to worked-out areas and ventilation through (b)(6), and areas where com- controls on these sections and in these pressors subject to § 75.344 are installed areas, and the examination shall in- if the electrical installation or com- clude tests of the roof, face and rib con- pressor is or will be energized during ditions on these sections and in these the shift. areas. (10) Other areas where work or travel (4) Approaches to worked-out areas during the oncoming shift is scheduled along intake air courses and at the en- prior to the beginning of the preshift tries used to carry air into worked-out examination.

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(11) Preshift examinations shall in- (e) The district manager may require clude examinations to identify viola- the operator to examine other areas of tions of the standards listed below: the mine or examine for other hazards (i) §§ 75.202(a) and 75.220(a)(1)—roof and violations of other mandatory control; health or safety standards found during (ii) §§ 75.333(h) and 75.370(a)(1)—ven- the preshift examination. tilation, methane; (f) Certification. At each working (iii) §§ 75.400 and 75.403—accumula- place examined, the person doing the tions of combustible materials and ap- preshift examination shall certify by plication of rock dust; initials, date, and the time, that the (iv) § 75.1403—other safeguards, lim- examination was made. In areas re- ited to maintenance of travelways quired to be examined outby a working along belt conveyors, off track haulage section, the certified person shall cer- roadways, and track haulage, track tify by initials, date, and the time at switches, and other components for enough locations to show that the en- haulage; tire area has been examined. (v) § 75.1722(a)—guarding moving ma- (g) Recordkeeping. A record of the re- chine parts; and sults of each preshift examination, in- (vi) § 75.1731(a)—maintenance of belt cluding a record of hazardous condi- conveyor components. tions and violations of the nine manda- (c) The person conducting the tory health or safety standards and preshift examination shall determine their locations found by the examiner the volume of air entering each of the during each examination, and of the re- following areas if anyone is scheduled sults and locations of air and methane to work in the areas during the oncom- measurements, shall be made on the ing shift: surface before any persons, other than (1) In the last open crosscut of each certified persons conducting examina- set of entries or rooms on each working tions required by this subpart, enter section and areas where mechanized any underground area of the mine. The mining equipment is being installed or results of methane tests shall be re- removed. The last open crosscut is the corded as the percentage of methane crosscut in the line of pillars con- measured by the examiner. The record taining the permanent stoppings that shall be made by the certified person separate the intake air courses and the who made the examination or by a per- return air courses. son designated by the operator. If the (2) On each longwall or shortwall in record is made by someone other than the intake entry or entries at the in- the examiner, the examiner shall take end of the longwall or shortwall verify the record by initials and date face immediately outby the face and by or at the end of the shift for which the velocity of air at each end of the the examination was made. A record face at the locations specified in the shall also be made by a certified person approved ventilation plan. of the action taken to correct haz- (3) At the intake end of any pillar ardous conditions and violations of line— mandatory health or safety standards (i) If a single split of air is used, in found during the preshift examination. the intake entry furthest from the re- All preshift and corrective action turn air course, immediately outby the records shall be countersigned by the first open crosscut outby the line of mine foreman or equivalent mine offi- pillars being mined; or cial by the end of the mine foreman’s (ii) If a split system is used, in the in- or equivalent mine official’s next regu- take entries of each split immediately larly scheduled working shift. The inby the split point. records required by this section shall (d) The person conducting the be made in a secure book that is not preshift examination shall check the susceptible to alteration or electroni- refuge alternative for damage, the in- cally in a computer system so as to be tegrity of the tamper-evident seal and secure and not susceptible to alter- the mechanisms required to deploy the ation. refuge alternative, and the ready avail- (h) Retention period. Records shall be ability of compressed oxygen and air. retained at a surface location at the

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mine for at least 1 year and shall be § 75.362 On-shift examination. made available for inspection by au- (a)(1) At least once during each shift, thorized representatives of the Sec- or more often if necessary for safety, a retary and the representative of min- certified person designated by the oper- ers. ator shall conduct an on-shift examina- [61 FR 9829, Mar. 11, 1996, as amended at 61 tion of each section where anyone is FR 55527, Oct. 25, 1996; 62 FR 35085, June 30, assigned to work during the shift and 1997; 64 FR 45170, Aug. 19, 1999; 73 FR 80697, any area where mechanized mining Dec. 31, 2008; 77 FR 20714, Apr. 6, 2012] equipment is being installed or removed during the shift. The certified § 75.361 Supplemental examination. person shall check for hazardous condi- (a)(1) Except for certified persons tions and violations of the mandatory conducting examinations required by health or safety standards referenced this subpart, within 3 hours before any- in paragraph (a)(3) of this section, test one enters an area in which a preshift for methane and oxygen deficiency, and examination has not been made for determine if the air is moving in its that shift, a certified person shall ex- proper direction. amine the area for hazardous condi- (2) A person designated by the oper- tions and violations of the mandatory ator shall conduct an examination and health or safety standards referenced record the results and the corrective in paragraph (a)(2) of this section, de- actions taken to assure compliance termine whether the air is traveling in with the respirable dust control param- its proper direction and at its normal eters specified in the approved mine volume, and test for methane and oxy- ventilation plan. In those instances gen deficiency. when a shift change is accomplished (2) Supplemental examinations shall without an interruption in production include examinations to identify viola- on a section, the examination shall be tions of the standards listed below: made anytime within 1 hour after the (i) §§ 75.202(a) and 75.220(a)(1)—roof shift change. In those instances when control; there is an interruption in production (ii) §§ 75.333(h) and 75.370(a)(1)—ven- during the shift change, the examina- tilation, methane; tion shall be made before production (iii) §§ 75.400 and 75.403—accumula- begins on a section. Deficiencies in tions of combustible materials and ap- dust controls shall be corrected before plication of rock dust; production begins or resumes. The examination shall include: Air quantities (iv) § 75.1403—other safeguards, lim- and velocities; water pressures and ited to maintenance of travelways flow rates; excessive leakage in the along belt conveyors, off track haulage water delivery system; water spray roadways, and track haulage, track numbers and orientations; section ven- switches, and other components for tilation and control device placement; haulage; roof bolting machine dust collector (v) § 75.1722(a)—guarding moving ma- vacuum levels; scrubber air flow rate; chine parts; and work practices required by the ventila- (vi) § 75.1731(a)—maintenance of belt tion plan; and any other dust suppres- conveyor components. sion measures. Measurements of the air (b) Certification. At each working velocity and quantity, water pressure place examined, the person making the and flow rates are not required if con- supplemental examination shall certify tinuous monitoring of these controls is by initials, date, and the time, that the used and indicates that the dust con- examination was made. In areas re- trols are functioning properly. quired to be examined outby a working (3) On-shift examinations shall in- section, the certified person shall cer- clude examinations to identify viola- tify by initials, date, and the time at tions of the standards listed below: enough locations to show that the en- (i) §§ 75.202(a) and 75.220(a)(1)—roof tire area has been examined. control; [61 FR 9829, Mar. 11, 1996, as amended at 77 (ii) §§ 75.333(h) and 75.370(a)(1)—ven- FR 20714, 2012] tilation, methane;

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(iii) §§ 75.400 and 75.403—accumula- (d) (1) A qualified person shall make tions of combustible materials and ap- tests for methane— plication of rock dust; (i) At the start of each shift at each (iv) § 75.1403—other safeguards, lim- working place before electrically oper- ited to maintenance of travelways ated equipment is energized; and along belt conveyors, off track haulage (ii) Immediately before equipment is roadways, and track haulage, track energized, taken into, or operated in a switches, and other components for working place; and haulage; (iii) At 20-minute intervals, or more (v) § 75.1722(a)—guarding moving ma- often if required in the approved ven- chine parts; and tilation plan at specific locations, dur- (vi) § 75.1731(a)—maintenance of belt ing the operation of equipment in the conveyor components. working place. (b) During each shift that coal is pro- (2) Except as provided for in para- duced, a certified person shall examine graph (d)(3) of this section, these meth- for hazardous conditions and violations ane tests shall be made at the face of the mandatory health or safety from under permanent roof support, standards referenced in paragraph using extendable probes or other ac- (a)(3) of this section along each belt ceptable means. When longwall or conveyor haulageway where a belt con- shortwall mining systems are used, veyor is operated. This examination these methane tests shall be made at may be conducted at the same time as the shearer, the plow, or the cutting the preshift examination of belt con- head. When mining has been stopped veyors and belt conveyor haulageways, for more than 20 minutes, methane if the examination is conducted within tests shall be conducted prior to the 3 hours before the oncoming shift. start up of equipment. (3) As an alternative method of com- (c) Persons conducting the on-shift pliance with paragraph (d)(2) of this examination shall determine at the fol- section during roof bolting, methane lowing locations: tests may be made by sweeping an area (1) The volume of air in the last open not less than 16 feet inby the last area crosscut of each set of entries or rooms of permanently supported roof, using a on each section and areas where probe or other acceptable means. This mechanized mining equipment is being method of testing is conditioned on installed or removed. The last open meeting the following requirements: crosscut is the crosscut in the line of (i) The roof bolting machine must be pillars containing the permanent equipped with an integral automated stoppings that separate the intake air temporary roof support (ATRS) system courses and the return air courses. that meets the requirements of 30 CFR (2) The volume of air on a longwall or 75.209. shortwall, including areas where (ii) The roof bolting machine must longwall or shortwall equipment is have a permanently mounted, MSHA- being installed or removed, in the in- approved methane monitor which take entry or entries at the intake end meets the maintenance and calibration of the longwall or shortwall. requirements of 30 CFR 75.342(a)(4), the (3) The velocity of air at each end of warning signal requirements of 30 CFR the longwall or shortwall face at the 75.342(b), and the automatic de- locations specified in the approved ven- energization requirements of 30 CFR tilation plan. 75.342(c). (4) The volume of air at the intake (iii) The methane monitor sensor end of any pillar line— must be mounted near the inby end and (i) Where a single split of air is used within 18 inches of the longitudinal in the intake entry furthest from the center of the ATRS support, and posi- return air course immediately outby tioned at least 12 inches from the roof the first open crosscut outby the line when the ATRS is fully deployed. of pillars being mined; or (iv) Manual methane tests must be (ii) Where a split system is used in made at intervals not exceeding 20 the intake entries of each split imme- minutes. The test may be made either diately inby the split point. from under permanent roof support or

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from the roof bolter’s work position than the end of the shift for which the protected by the deployed ATRS. examination was made. (v) Once a methane test is made at (3) The mine foreman or equivalent the face, all subsequent methane tests mine official shall countersign each ex- in the same area of unsupported roof amination record required under (a)(2) must also be made at the face, from of this section after it is verified by the under permanent roof support, using certified person under (g)(2)(ii) of this extendable probes or other acceptable section, and no later than the end of means at intervals not exceeding 20 the mine foreman’s or equivalent mine minutes. official’s next regularly scheduled (vi) The district manager may re- working shift. The record shall be quire that the ventilation plan include made in a secure book that is not sus- the minimum air quantity and the po- ceptible to alteration or electronically sition and placement of ventilation in a computer system so as to be secure controls to be maintained during roof and not susceptible to alteration. bolting. (4) Records shall be retained at a sur- (e) If auxiliary fans and tubing are face location at the mine for at least 1 used, they shall be inspected fre- year and shall be made available for in- quently. spection by authorized representatives of the Secretary and the representative (f) During each shift that coal is proof miners. duced and at intervals not exceeding 4 hours, tests for methane shall be made [61 FR 9829, Mar. 11, 1996; 61 FR 26442, May 28, by a certified person or by an atmos- 1996, as amended at 68 FR 40138, July 7, 2003; pheric monitoring system (AMS) in 77 FR 20715, Apr. 6, 2012; 79 FR 24987, May 1, each return split of air from each 2014] working section between the last work- § 75.363 Hazardous conditions and vio- ing place, or longwall or shortwall face, lations of mandatory health or safe- ventilated by that split of air and the ty standards; posting, correcting, junction of the return air split with an- and recording. other air split, seal, or worked-out (a) Any hazardous condition found by area. If auxiliary fans and tubing are the mine foreman or equivalent mine used, the tests shall be made at a loca- official, assistant mine foreman or tion outby the auxiliary fan discharge. equivalent mine official, or other cer- (g) Certification. (1) The person con- tified persons designated by the oper- ducting the on-shift examination in ator for the purposes of conducting ex- belt haulage entries shall certify by aminations under this subpart D, shall initials, date, and time that the exam- be posted with a conspicuous danger ination was made. The certified person sign where anyone entering the areas shall certify by initials, date, and the would pass. A hazardous condition time at enough locations to show that shall be corrected immediately or the the entire area has been examined. area shall remain posted until the haz- (2) The certified person directing the ardous condition is corrected. If the on-shift examination to assure compli- condition creates an imminent danger, ance with the respirable dust control everyone except those persons referred parameters specified in the approved to in section 104(c) of the Act shall be mine ventilation plan shall: withdrawn from the area affected to a (i) Certify by initials, date, and time safe area until the hazardous condition on a board maintained at the section is corrected. Only persons designated load-out or similar location showing by the operator to correct or evaluate that the examination was made prior the hazardous condition may enter the to resuming production; and posted area. Any violation of a manda- (ii) Verify, by initials and date, the tory health or safety standard found record of the results of the examina- during a preshift, supplemental, on- tion required under (a)(2) of this sec- shift, or weekly examination shall be tion to assure compliance with the res- corrected. pirable dust control parameters speci- (b) A record shall be made of any haz- fied in the mine ventilation plan. The ardous condition and any violation of verification shall be made no later the nine mandatory health or safety

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standards found by the mine examiner. the area. The locations of measure- This record shall be kept in a book ment points where tests and measure- maintained for this purpose on the sur- ments will be performed shall be in- face at the mine. The record shall be cluded in the mine ventilation plan and made by the completion of the shift on shall be adequate in number and loca- which the hazardous condition or violation to assure ventilation and air qual- tion of the nine mandatory health or ity in the area. Air quantity measure- safety standards is found and shall in- ments shall also be made where the air clude the nature and location of the enters and leaves the worked-out area. hazardous condition or violation and An alternative method of evaluating the corrective action taken. This the ventilation of the area may be ap- record shall not be required for shifts proved in the ventilation plan. when no hazardous conditions or viola- (2) At least every 7 days, a certified tions of the nine mandatory health or person shall evaluate the effectiveness safety standards are found. of bleeder systems required by § 75.334 (c) The record shall be made by the as follows: certified person who conducted the ex- (i) Measurements of methane and ox- amination or a person designated by ygen concentrations and air quantity the operator. If made by a person other than the certified person, the certified and a test to determine if the air is person shall verify the record by ini- moving in its proper direction shall be tials and date by or at the end of the made where air enters the worked-out shift for which the examination was area. made. Records shall be countersigned (ii) Measurements of methane and by the mine foreman or equivalent oxygen concentrations and air quan- mine official by the end of the mine tity and a test to determine if the air foreman’s or equivalent mine official’s is moving in the proper direction shall next regularly scheduled working shift. be made immediately before the air en- The record shall be made in a secure ters a return split of air. book that is not susceptible to alter- (iii) At least one entry of each set of ation or electronically in a computer bleeder entries used as part of a bleeder system so as to be secure and not sus- system under § 75.334 shall be traveled ceptible to alteration. in its entirety. Measurements of meth- (d) Retention period. Records shall be ane and oxygen concentrations and air retained at a surface location at the quantities and a test to determine if mine for at least 1 year and shall be the air is moving in the proper direc- made available for inspection by au- tion shall be made at the measurement thorized representatives of the Sec- point locations specified in the mine retary and the representative of min- ventilation plan to determine the effec- ers. tiveness of the bleeder system. (e) Review of citations and orders. The (iv) In lieu of the requirements of mine operator shall review with mine paragraphs (a)(2)(i) and (iii) of this sec- examiners on a quarterly basis cita- tion, an alternative method of evaluations and orders issued in areas where tion may be specified in the ventilation preshift, supplemental, on-shift, and plan provided the alternative method weekly examinations are required. results in proper evaluation of the ef- [61 FR 9829, Mar. 11, 1996; 61 FR 26442, May 28, fectiveness of the bleeder system. 1996; 77 FR 20715, Apr. 6, 2012] (b) Hazardous conditions and violations of mandatory health or safety standards. § 75.364 Weekly examination. At least every 7 days, an examination (a) Worked-out areas. (1) At least for hazardous conditions and violations every 7 days, a certified person shall of the mandatory health or safety examine unsealed worked-out areas standards referenced in paragraph where no pillars have been recovered (b)(8) of this section shall be made by a by traveling to the area of deepest pen- certified person designated by the oper- etration; measuring methane and oxy- ator at the following locations: gen concentrations and air quantities (1) In at least one entry of each in- and making tests to determine if the take air course, in its entirety, so that air is moving in the proper direction in the entire air course is traveled.

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(2) In at least one entry of each re- mandatory health or safety standards turn air course, in its entirety, so that found during a weekly examination the entire air course is traveled. shall be corrected. (3) In each longwall or shortwall (e) The weekly examination may be travelway in its entirety, so that the conducted at the same time as the entire travelway is traveled. preshift or on-shift examinations. (4) At each seal along return and (f) (1) The weekly examination is not bleeder air courses and at each seal required during any 7 day period in along intake air courses not examined which no one enters any underground under § 75.360(b)(5). area of the mine. (5) In each escapeway so that the en- (2) Except for certified persons re- tire escapeway is traveled. quired to make examinations, no one (6) On each working section not ex- shall enter any underground area of amined under § 75.360(b)(3) during the the mine if a weekly examination has previous 7 days. not been completed within the previous (7) At each water pump not examined 7 days. during a preshift examination con- (g) Certification. The person making ducted during the previous 7 days. the weekly examinations shall certify (8) Weekly examinations shall inby initials, date, and the time that the clude examinations to identify viola- examination was made. Certifications tions of the standards listed below: and times shall appear at enough loca- (i) §§ 75.202(a) and 75.220(a)(1)—roof tions to show that the entire area has control; (ii) §§ 75.333(h) and 75.370(a)(1)—ven- been examined. tilation, methane; (h) Recordkeeping. At the completion (iii) §§ 75.400 and 75.403—accumula- of any shift during which a portion of a tions of combustible materials and ap- weekly examination is conducted, a plication of rock dust; and record of the results of each weekly ex- (iv) § 75.1403—maintenance of off amination, including a record of haz- track haulage roadways, and track ardous conditions and violations of the haulage, track switches, and other nine mandatory health or safety stand- components for haulage; ards found during each examination (v) § 75.1722(a)—guarding moving ma- and their locations, the corrective ac- chine parts; and tion taken, and the results and loca- (vi) § 75.1731(a)—maintenance of belt tion of air and methane measurements, conveyor components. shall be made. The results of methane (c) Measurements and tests. At least tests shall be recorded as the percent- every 7 days, a certified person shall— age of methane measured by the exam- (1) Determine the volume of air en- iner. The record shall be made by the tering the main intakes and in each in- person making the examination or a take split; person designated by the operator. If (2) Determine the volume of air and made by a person other than the exam- test for methane in the last open cross- iner, the examiner shall verify the cut in any pair or set of developing en- record by initials and date by or at the tries or rooms, in the return of each end of the shift for which the examina- split of air immediately before it en- tion was made. The record shall be ters the main returns, and where the countersigned by the mine foreman or air leaves the main returns; and equivalent mine official by the end of (3) Test for methane in the return the mine foreman’s or equivalent mine entry nearest each set of seals imme- official’s next regularly scheduled diately after the air passes the seals. working shift. The records required by (d) Hazardous conditions shall be cor- this section shall be made in a secure rected immediately. If the condition book that is not susceptible to alter- creates an imminent danger, everyone ation or electronically in a computer except those persons referred to in sec- system so as to be secure and not sus- tion 104(c) of the Act shall be with- ceptible to alteration. drawn from the area affected to a safe (i) Retention period. Records shall be area until the hazardous condition is retained at a surface location at the corrected. Any violation of the nine mine for at least 1 year and shall be

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made available for inspection by au- the time of submittal. The proposed thorized representatives of the Sec- plan or proposed revision shall remain retary and the representative of min- posted until it is approved, withdrawn ers. or denied. [61 FR 9829, Mar. 11, 1996, as amended at 77 (b) Following receipt of the proposed FR 20715, Apr. 6, 2012] plan or proposed revision, the representative of miners may submit § 75.370 Mine ventilation plan; submis- timely comments to the district man- sion and approval. ager, in writing, for consideration dur- (a)(1) The operator shall develop and ing the review process. A copy of these follow a ventilation plan approved by comments shall also be provided to the the district manager. The plan shall be operator by the district manager upon designed to control methane and res- request. pirable dust and shall be suitable to (c) (1) The district manager will no- the conditions and mining system at tify the operator in writing of the ap- the mine. The ventilation plan shall proval or denial of approval of a pro- consist of two parts, the plan content posed ventilation plan or proposed re- as prescribed in § 75.371 and the ventila- vision. A copy of this notification will tion map with information as pre- be sent to the representative of miners scribed in § 75.372. Only that portion of by the district manager. the map which contains information (2) If the district manager denies ap- required under § 75.371 will be subject to proval of a proposed plan or revision, approval by the district manager. the deficiencies of the plan or revision (2) The proposed ventilation plan and shall be specified in writing and the op- any revision to the plan shall be sub- erator will be provided an opportunity mitted in writing to the district man- to discuss the deficiencies with the dis- ager. When revisions to a ventilation trict manager. plan are proposed, only the revised (d) No proposed ventilation plan shall pages, maps, or sketches of the plan be implemented before it is approved need to be submitted. When required in by the district manager. Any inten- writing by the district manager, the tional change to the ventilation sys- operator shall submit a fully revised tem that alters the main air current or plan by consolidating the plan and all any split of the main air current in a revisions in an orderly manner and by manner that could materially affect deleting all outdated material. the safety and health of the miners, or (3) (i) The mine operator shall notify any change to the information required the representative of miners at least 5 in § 75.371 shall be submitted to and ap- days prior to submission of a mine ven- proved by the district manager before tilation plan and any revision to a implementation. mine ventilation plan. If requested, the (e) Before implementing an approved mine operator shall provide a copy to ventilation plan or a revision to a ven- the representative of miners at the tilation plan, persons affected by the time of notification. In the event of a revision shall be instructed by the op- situation requiring immediate action erator in its provisions. on a plan revision, notification of the (f) The approved ventilation plan and revision shall be given, and if re- any revisions shall be— quested, a copy of the revision shall be (1) Provided upon request to the rep- provided, to the representative of min- resentative of miners by the operator ers by the operator at the time of sub- following notification of approval; mittal; (2) Made available for inspection by (ii) A copy of the proposed ventila- the representative of miners; and tion plan, and a copy of any proposed (3) Posted on the mine bulletin board revision, submitted for approval shall within 1 working day following notifi- be made available for inspection by the cation of approval. The approved plan representative of miners; and and revisions shall remain posted on (iii) A copy of the proposed ventila- the bulletin board for the period that tion plan, and a copy of any proposed they are in effect. revision, submitted for approval shall (g) The ventilation plan for each be posted on the mine bulletin board at mine shall be reviewed every 6 months

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by an authorized representative of the (2) The maximum distance that ven- Secretary to assure that it is suitable tilation control devices will be in- to current conditions in the mine. stalled from each working face when mining or installing roof bolts in en- § 75.371 Mine ventilation plan; con- tries and crosscuts; tents. (3) Procedures for maintaining the The mine ventilation plan shall con- roof bolting machine dust collection tain the information described below system in approved condition; and and any additional provisions required (4) Recommended best work practices by the district manager: for equipment operators to minimize (a) The mine name, company name, dust exposure. mine identification number, and the (g) Locations where the air quan- name of the individual submitting the tities must be greater than 3,000 cubic plan information. feet per minute (see § 75.325(a)(1)). (b) Planned main mine fan stoppages, (h) In anthracite mines, locations other than those scheduled for testing, where the air quantities must be great- maintenance or adjustment, including er than 1,500 cubic feet per minute (see procedures to be followed during these § 75.325(e)(1)). stoppages and subsequent restarts (see (i) Working places and working faces § 75.311(a)) and the type of device to be other than those where coal is being used for monitoring main mine fan cut, mined, drilled for blasting or load- pressure, if other than a pressure re- ed, where a minimum air quantity will cording device (see 75.310(a)(4)). be maintained, and the air quantity at (c) Methods of protecting main mine those locations (see § 75.325(a)(1)). fans and associated components from (j) The operating volume of machine the forces of an underground explosion mounted dust collectors or diffuser if a 15-foot offset from the nearest side fans, if used (see § 75.325(a)(3)), includ- of the mine opening is not provided ing the type and size of dust collector (see § 75.310(a)(6)); and the methods of screen used, and a description of the protecting main mine fans and intake procedures to maintain dust collectors air openings if combustible material used on equipment. will be within 100 feet of the area sur- (k) The minimum mean entry air ve- rounding the fan or these openings (see locity in exhausting face ventilation § 75.311(f)). systems where coal is being cut, mined, (d) Persons that will be permitted to drilled for blasting, or loaded, if the ve- enter the mine, the work these persons locity will be less than 60 feet per will do while in the mine, and electric minute. Other working places where power circuits that will be energized coal is not being cut, mined, drilled for when a back-up fan system is used that blasting or loaded, where at least 60 does not provide the ventilating quan- feet per minute or some other min- tity provided by the main mine fan (see imum mean entry air velocity will be § 75.311(c)). maintained (see § 75.326). (e) The locations and operating con- (l) The maximum distance if greater ditions of booster fans installed in an- than 10 feet from each working face at thracite mines (see § 75.302). which face ventilation control devices (f) Section and face ventilation sys- will be installed (see § 75.330(b)(2)). The tems used and the minimum quantity working places other than those where of air that will be delivered to the coal is being cut, mined, drilled for working section for each mechanized blasting or loaded, where face ventila- mining unit, including drawings illus- tion control devices will be used (see trating how each system is used, and a § 75.330(b)(1)(ii). description of each different dust sup- (m) The volume of air required in the pression system used on equipment, last open crosscut or the quantity of identified by make and model, on each air reaching the pillar line if greater working section, including: than 9,000 cubic feet per minute (see (1) The number, types, location, ori- § 75.325(b)). entation, operating pressure, and flow (n) In anthracite mines, the volume rate of operating water sprays; of air required in the last open crosscut

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or the quantity of air reaching the pil- nonpillared worked-out areas (see lar line if greater than 5,000 cubic feet § 75.364 (a)(1)) and the effectiveness of per minute (see § 75.325(e)(2)). bleeder systems (see § 75.364 (a)(2)(iii). (o) Locations where separations of in- Alternative methods of evaluation of take and return air courses will be the effectiveness of bleeder systems built and maintained to other than the (§ 75.364 (a)(2)(iv)). third connecting crosscut outby each (aa) The means for adequately main- working face (see § 75.333(b)(1)). taining bleeder entries free of obstruc- (p) The volume of air required at the tions such as roof falls and standing intake to the longwall sections, if dif- water (see § 75.334(c)(3)). ferent than 30,000 cubic feet per minute (bb) The location of ventilation de- (see § 75.325(c)). vices such as regulators, stoppings and (q) The velocities of air on a longwall bleeder connectors used to control air or shortwall face, and the locations movement through worked-out areas where the velocities must be measured (see § 75.334(c)(4)). The location and se- (see § 75.325(c)(2)). quence of construction of proposed (r) The minimum quantity of air that seals for each worked-out area. (see will be provided during the installation § 75.334(e)). and removal of mechanized mining (cc) In mines with a demonstrated equipment, the location where this history of spontaneous combustion: a quantity will be provided, and the ven- description of the measures that will tilation controls that will be used (see be used to detect methane, carbon § 75.325(d), (g), and (i)). monoxide, and oxygen concentration (s) The locations and frequency of the during and after pillar recovery and in methane tests if required more often worked-out areas where no pillars have by § 75.362(d)(1)(iii) (see § 75.362 been recovered (see § 75.334(f)(1); and, (d)(1)(iii). the actions which will be taken to pro- (t) The locations where samples for tect miners from the hazards associ- ‘‘designated areas’’ will be collected, ated with spontaneous combustion (see including the specific location of each § 75.334(f)(2). If a bleeder system will sampling device, and the respirable not be used, the methods that will be dust control measures used at the dust used to control spontaneous combus- generating sources for these locations tion, accumulations of methane-air (see §§ 70.207 and 70.209 of this chapter). mixtures, and other gases, dusts, and (u) The methane and dust control fumes in the worked-out area (see systems at underground dumps, § 75.334(f)(3)). crushers, transfer points, and (dd) The location of all horizontal haulageways. degasification holes that are longer (v) Areas in trolley haulage entries than 1,000 feet and the location of all where the air velocity will be greater vertical degasification holes. than 250 feet per minute and the veloc- (ee) If methane drainage systems are ity in these areas (see § 75.327(b)). used, a detailed sketch of each system, (w) Locations where entries will be including a description of safety pre- advanced less than 20 feet from the cautions used with the systems. inby rib without a crosscut being pro- (ff) Seal installation requirements vided where a line brattice will be re- provided by § 75.335 and the sampling quired. (see § 75.333(g)). provisions provided by § 75.336. (x) A description of the bleeder sys- (gg) The alternative location for the tem to be used, including its design additional sensing device if the device (see § 75.334). will not be installed on the longwall (y) The means for determining the ef- shearing machine (see § 75.342(a)(2)). fectiveness of bleeder systems (see (hh) The ambient level in parts per § 75.334(c)(2)). million of carbon monoxide, and the (z) The locations where measure- method for determining the ambient ments of methane and oxygen con- level, in all areas where carbon mon- centrations and air quantities and oxide sensors are installed. tests to determine whether the air is (ii) The locations (designated areas) moving in the proper direction will be where dust measurements would be made to evaluate the ventilation of made in the belt entry when belt air is

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used to ventilate working sections or units of diesel-powered equipment are areas where mechanized mining equip- operated (see § 75.325(g) (1)–(3) and (i)). ment is being installed or removed, in (ww) The diesel-powered mining accordance with § 75.350(b)(3). equipment excluded from the calcula- (jj) The locations and approved ve- tion under § 75.325(g). (see § 75.325(h)). locities at those locations where air ve- (xx) Action levels higher than the 50 locities in the belt entry are above or percent level specified by § 70.1900(c). below the limits set forth in (see § 75.325(j)). § 75.350(a)(2) or §§ 75.350(b)(7) and (yy) The locations where the pressure 75.350(b)(8). differential cannot be maintained from (kk) The locations where air quan- the primary escapeway to the belt tities are measured as set forth in entry. § 75.350(b)(6). (ll) The locations and use of point- [61 FR 9829, Mar. 11, 1996, as amended at 61 feed regulators, in accordance with FR 55527, Oct. 25, 1996; 69 FR 17529, Apr. 2, §§ 75.350(c) and 75.350(d)(5). 2004; 72 FR 28817, May 22, 2007; 73 FR 21209, Apr. 18, 2008; 73 FR 80613, Dec. 31, 2008; 79 FR (mm) The location of any diesel-dis- 24987, May 1, 2014] criminating sensor, and additional carbon monoxide or smoke sensors in- § 75.372 Mine ventilation map. stalled in the belt air course. (nn) The length of the time delay or (a)(1) At intervals not exceeding 12 any other method used to reduce the months, the operator shall submit to number of non-fire related alert and the district manager 3 copies of an up- alarm signals from carbon monoxide to-date map of the mine drawn to a sensors. scale of not less than 100 nor more than (oo) The reduced alert and alarm set- 500 feet to the inch. A registered engi- tings for carbon monoxide sensors, in neer or a registered surveyor shall cer- accordance with § 75.351(i)(2). tify that the map is accurate. (pp) The alternate detector and the (2) In addition to the informational alert and alarm levels associated with requirements of this section the map the detector, in accordance with may also be used to depict and explain § 75.352(e)(7). plan contents that are required in (qq) The distance that separation be- § 75.371. Information shown on the map tween the primary escapeway and the to satisfy the requirements of § 75.371 belt or track haulage entries will be shall be subject to approval by the dis- maintained if other than to the first trict manager. connecting crosscut outby the section (b) The map shall contain the fol- loading point (see § 75.380(g)). lowing information: (rr) In anthracite mines, the dimen- (1) The mine name, company name, sions of escapeways where the pitch of mine identification number, a legend the coal seam does not permit identifying the scale of the map and escapeways to be maintained 4 feet by symbols used, and the name of the indi- 5 feet and the locations where these di- vidual responsible for the information mensions must be maintained (see on the map. § 75.381(c)(4)). (2) All areas of the mine, including (ss) Areas designated by the district sealed and unsealed worked-out areas. manager where measurements of CO (3) All known mine workings that are and NO2 concentrations will be made located in the same coalbed within (see § 70.1900(a)(4)). 1,000 feet of existing or projected work- (tt) Location where the air quantity ings. These workings may be shown on will be maintained at the section load- a mine map with a scale other than ing point (see § 75.325(f)(2)). that required by paragraph (a) of this (uu) Any additional location(s) re- section, if the scale does not exceed quired by the district manager where a 2,000 feet to the inch and is specified on minimum air quantity must be main- the map. tained for an individual unit of diesel- (4) The locations of all known mine powered equipment. (see § 75.325(f)(5)). workings underlying and overlying the (vv) The minimum air quantities mine property and the distance be- that will be provided where multiple tween the mine workings.

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(5) The locations of all known oil and (19) The entry height, velocity and gas wells and all known drill holes that direction of the air current at or near penetrate the coalbed being mined. the midpoint of each belt flight where (6) The locations of all main mine the height and width of the entry are fans, installed backup fans and motors, representative of the belt haulage and each fan’s specifications, including entry. size, type, model number, manufac- (20) The location and designation of turer, operating pressure, motor horse- air courses that have been redesignated power, and revolutions per minute. from intake to return for the purpose (7) The locations of all surface mine of ventilation of structures, areas or openings and the direction and quan- installations that are required by this tity of air at each opening. subpart D to be ventilated to return air (8) The elevation at the top and bot- courses, and for ventilation of seals. tom of each shaft and slope, and shaft (c) The mine map required by § 75.1200 and slope dimensions, including depth may be used to satisfy the require- and length. ments for the ventilation map, pro- (9) The direction of air flow in all un- vided that all the information required derground areas of the mine. by this section is contained on the (10) The locations of all active work- map. ing sections and the four-digit identi- [61 FR 9829, Mar. 11, 1996, as amended at 69 fication number for each mechanized FR 17530, Apr. 2, 2004; 73 FR 80697, Dec. 31, mining unit (MMU). 2008] (11) The location of all escapeways and refuge alternatives. § 75.373 Reopening mines. (12) The locations of all ventilation After a mine is abandoned or de- controls, including permanent clared inactive, and before it is re- stoppings, overcasts, undercasts, regu- opened, mining operations shall not lators, seals, airlock doors, haulageway begin until MSHA has been notified doors and other doors, except tem- and has completed an inspection. porary ventilation controls on working sections. § 75.380 Escapeways; bituminous and (13) The direction and quantity of lignite mines. air— (a) Except in situations addressed in (i) Entering and leaving each split; § 75.381, § 75.385 and § 75.386, at least two (ii) In the last open crosscut of each separate and distinct travelable pas- set of entries and rooms; and sageways shall be designated as (iii) At the intake end of each pillar escapeways and shall meet the require- line, including any longwall or ments of this section. shortwall. (b) (1) Escapeways shall be provided (14) Projections for at least 12 from each working section, and each months of anticipated mine develop- area where mechanized mining equipment, proposed ventilation controls, ment is being installed or removed, proposed bleeder systems, and the an- continuous to the surface escape drift ticipated location of intake and return opening or continuous to the escape air courses, belt entries, and shaft or slope facilities to the surface. escapeways. (2) During equipment installation, (15) The locations of existing meth- these escapeways shall begin at the ane drainage systems. projected location for the section load- (16) The locations and type of all ing point. During equipment removal, AMS sensors required by subpart D of they shall begin at the location of the this part. last loading point. (17) Contour lines that pass through (c) The two separate and distinct whole number elevations of the coalbed escapeways required by this section being mined. These lines shall be shall not end at a common shaft, slope, spaced at 10-foot elevation levels un- or drift opening, except that multiple less a wider spacing is permitted by the compartment shafts or slopes sepa- district manager. rated by walls constructed of non- (18) The location of proposed seals for combustible material may be used as each worked-out area. separate and distinct passageways.

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(d) Each escapeway shall be— longwall sections, is necessary during (1) Maintained in a safe condition to normal mining operations, such as ma- always assure passage of anyone, in- terial cars containing rock dust or roof cluding disabled persons; control supplies, or is to be used for the (2) Clearly marked to show the route evacuation of miners off the section in and direction of travel to the surface; the event of an emergency. In any in- (3) Maintained to at least a height of stance, escapeways shall be of suffi- 5 feet from the mine floor to the mine cient width to enable miners, including roof, excluding the thickness of any disabled persons, to escape quickly in roof support, except that the an emergency. When there is a need to escapeways shall be maintained to at determine whether sufficient width is least the height of the coalbed, exclud- provided, MSHA may require a stretching the thickness of any roof support, er test where 4 persons carry a miner where the coalbed is less than 5 feet. In through the area in question on a areas of mines where escapeways pass stretcher; through doors, the height may be less (5) Located to follow the most direct, than 5 feet, provided that sufficient safe and practical route to the nearest height is maintained to enable miners, mine opening suitable for the safe including disabled persons, to escape evacuation of miners; and quickly in an emergency. In areas of (6) Provided with ladders, stairways, mines developed before November 16, ramps, or similar facilities where the 1992, where escapeways pass over or escapeways cross over obstructions. under overcasts or undercasts, the (7) Provided with a continuous, dura- height may be less than 5 feet provided ble directional lifeline or equivalent that sufficient height is maintained to device that shall be— enable miners, including disabled per- (i) Installed and maintained through- sons, to escape quickly in an emer- out the entire length of each gency. When there is a need to deter- escapeway as defined in paragraph mine whether sufficient height is pro- (b)(1) of this section; vided, MSHA may require a stretcher (ii) Flame-resistant in accordance test where 4 persons carry a miner with the requirements of part 18 of this through the area in question on a chapter upon replacement of existing stretcher; lifelines; but in no case later than June (4) Maintained at least 6 feet wide ex- 15, 2009; cept— (iii) Marked with a reflective mate- (i) Where necessary supplemental rial every 25 feet; roof support is installed, the escapeway (iv) Located in such a manner for shall not be less than 4 feet wide; or miners to use effectively to escape; (ii) Where the route of travel passes (v) Equipped with one directional in- through doors or other permanent ven- dicator cone securely attached to the tilation controls, the escapeway shall lifeline, signifying the route of escape, be at least 4 feet wide to enable miners placed at intervals not exceeding 100 to escape quickly in an emergency, or feet. Cones shall be installed so that (iii) Where the alternate escapeway the tapered section points inby; passes through doors or other perma- (vi) Equipped with one sphere se- nent ventilation controls or where sup- curely attached to the lifeline at each plemental roof support is required and intersection where personnel doors are sufficient width is maintained to en- installed in adjacent crosscuts; able miners, including disabled per- (vii) Equipped with two securely at- sons, to escape quickly in an emer- tached cones, installed consecutively gency. When there is a need to deter- with the tapered section pointing inby, mine whether sufficient width is pro- to signify an attached branch line is vided, MSHA may require a stretcher immediately ahead. test where 4 persons carry a miner (A) A branch line leading from the through the area in question on a lifeline to an SCSR cache will be stretcher, or marked with four cones with the base (iv) Where mobile equipment near sections in contact to form two dia- working sections, and other equipment mond shapes. The cones must be placed essential to the ongoing operation of within reach of the lifeline.

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(B) A branch line leading from the least eight inches in length. The spi- lifeline to a refuge alternative will be raled coil must be placed within reach marked with a rigid spiraled coil at of the lifeline (see Illustration 1 below).

(e) Surface openings shall be ade- (i) To all areas of a primary quately protected to prevent surface escapeway developed on or after No- fires, fumes, smoke, and flood water vember 16, 1992; from entering the mine. (ii) Effective as of June 10, 1997, to all (f) Primary escapeway. (1) One areas of a primary escapeway devel- escapeway that is ventilated with in- oped between March 30, 1970 and No- take air shall be designated as the pri- vember 16, 1992; and mary escapeway. The primary (iii) Effective as of June 10, 1997, to escapeway shall have a higher ventila- all areas of the primary escapeway de- tion pressure than the belt entry un- veloped prior to March 30, 1970 where less the mine operator submits an al- separation of the belt and trolley haul- ternative in the mine ventilation plan age entries from the primary to protect the integrity of the primary escapeway existed prior to November escapeway, based on mine specific con- 16, 1992. ditions, which is approved by the dis- (3) The following equipment is not trict manager. permitted in the primary escapeway: (2) Paragraphs (f)(3) through (f)(7) of (i) Mobile equipment hauling coal ex- this section apply as follows: cept for hauling coal incidental to

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cleanup or maintenance of the primary the suppression system is suitable for escapeway. the intended application and is listed (ii) Compressors, except— or approved by a nationally recognized (A) Compressors necessary to main- independent testing laboratory, or, tain the escapeway in safe, travelable (ii) Battery powered and provided condition; with two 10 pound multipurpose dry (B) Compressors that are components chemical portable fire extinguishers. of equipment such as locomotives and (6) Notwithstanding the requirements rock dusting machines; and of paragraph (f)(3)(i), mobile equipment (C) Compressors of less than five not provided with a fire suppression horsepower. system may operate in the primary (iii) Underground transformer sta- escapeway if no one is inby except tions, battery charging stations, sub- those persons directly engaged in using stations, and rectifiers except— or moving the equipment. (A) Where necessary to maintain the (7) Notwithstanding the requirements escapeway in safe, travelable condi- of paragraph (f)(3)(i), mobile equipment tion; and designated and used only as emergency (B) Battery charging stations and vehicles or ambulances, may be oper- rectifiers and power centers with trans- ated in the primary escapeway without formers that are either dry-type or fire suppression systems. contain nonflammable liquid, provided (g) Except where separation of belt they are located on or near a working and trolley haulage entries from des- section and are moved as the section advances or retreats. ignated escapeways did not exist before (iv) Water pumps, except— November 15, 1992, and except as pro- (A) Water pumps necessary to main- vided in § 75.350(c), the primary tain the escapeway in safe, travelable escapeway must be separated from belt condition; and trolley haulage entries for its en- (B) Submersible pumps; tire length, to and including the first (C) Permissible pumps and associated connecting crosscut outby each loading permissible switchgear; point except when a greater or lesser (D) Pumps located on or near a work- distance for this separation is specified ing section that are moved as the sec- and approved in the mine ventilation tion advances or retreats; plan and does not pose a hazard to min- (E) Pumps installed in anthracite ers. mines; and (h) Alternate escapeway. One (F) Small portable pumps. escapeway shall be designated as the (4) Mobile equipment operated in the alternate escapeway. The alternate primary escapeway, except for contin- escapeway shall be separated from the uous miners and as provided in para- primary escapeway for its entire graphs (f)(5), (f)(6), and (f)(7) of this sec- length, except that the alternate and tion, shall be equipped with a fire sup- primary escapeways may be ventilated pression system installed according to from a common intake air shaft or §§ 75.1107–3 through 75.1107–16 that is— slope opening. (i) Manually operated and attended (i) Mechanical escape facilities shall continuously by a person trained in the be provided and maintained for— systems function and use, or (1) Each shaft that is part of a des- (ii) A multipurpose dry chemical ignated escapeway and is greater than type capable of both automatic and 50 feet in depth; and manual activation. (2) Each slope from the coal seam to (5) Personnel carriers and small mo- the surface that is part of a designated bile equipment designed and used only escapeway and is inclined more than 9 for carrying people and small hand degrees from the horizontal. tools may be operated in primary (j) Within 30 minutes after mine per- escapeways if— sonnel on the surface have been noti- (i) The equipment is provided with a fied of an emergency requiring evacu- multipurpose dry chemical type fire ation, mechanical escape facilities pro- suppression system capable of both vided under paragraph (i) of this sec- automatic and manual activation, and tion shall be operational at the bottom

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of shaft and slope openings that are (1) Maintained in a safe condition to part of escapeways. always assure passage of anyone, in- (k) Except where automatically acti- cluding disabled persons; vated hoisting equipment is used, the (2) Clearly marked to show the route bottom of each shaft or slope opening of travel to the surface; that is part of a designated escapeway (3) Provided with ladders, stairways, shall be equipped with a means of sig- ramps, or similar facilities where the naling a surface location where a per- escapeways cross over obstructions; son is always on duty when anyone is and underground. When the signal is acti- (4) Maintained at least 4 feet wide by vated or the evacuation of persons un- 5 feet high. If the pitch or thickness of derground is necessary, the person the coal seam does not permit these di- shall assure that mechanical escape fa- mensions to be maintained other di- cilities are operational as required by mensions may be approved in the ven- paragraph (j) of this section. tilation plan. (l)(1) Stairways or mechanical escape (5) Provided with a continuous, dura- facilities shall be installed in shafts ble directional lifeline or equivalent that are part of the designated device that shall be— escapeways and that are 50 feet or less (i) Installed and maintained through- in depth, except ladders may be used in out the entire length of each shafts that are part of the designated escapeway as defined in paragraph (b) escapeways and that are 5 feet or less of this section; in depth. (ii) Flame-resistant in accordance (2) Stairways shall be constructed of with the requirements of part 18 of this concrete or metal, set on an angle not chapter upon replacement of existing to exceed 45 degrees from the hori- lifelines; but in no case later than June zontal, and equipped on the open side 15, 2009; with handrails. In addition, landing (iii) Marked with a reflective mate- platforms that are at least 2 feet by 4 rial every 25 feet; feet shall be installed at intervals not (iv) Located in such a manner for to exceed 20 vertical feet on the stair- miners to use effectively to escape; ways and equipped on the open side (v) Equipped with one directional in- with handrails. dicator cone securely attached to the (3) Ladders shall be constructed of lifeline, signifying the route of escape, metal, anchored securely, and set on an placed at intervals not exceeding 100 angle not to exceed 60 degrees from the feet. Cones shall be installed so that horizontal. the tapered section points inby; (m) A travelway designed to prevent (vi) Equipped with one sphere se- slippage shall be provided in slope and curely attached to the lifeline at each drift openings that are part of des- intersection where personnel doors are ignated escapeways, unless mechanical installed in adjacent crosscuts; escape facilities are installed. (vii) Equipped with two securely at- [61 FR 9829, Mar. 11, 1996; 61 FR 20877, May 8, tached cones, installed consecutively 1996, as amended at 61 FR 55527, Oct. 25, 1996; with the tapered section pointing inby, 69 FR 17530, Apr. 2, 2004; 71 FR 12269, Mar. 9, to signify an attached branch line is 2006; 71 FR 71452, Dec. 8, 2006; 73 FR 80613, immediately ahead. Dec. 31, 2008] (A) A branch line leading from the lifeline to an SCSR cache will be § 75.381 Escapeways; anthracite mines. marked with four cones with the base (a) Except as provided in §§ 75.385 and sections in contact to form two dia- 75.386, at least two separate and dis- mond shapes. The cones must be placed tinct travelable passageways shall be within reach of the lifeline. designated as escapeways and shall (B) A branch line leading from the meet the requirements of this section. lifeline to a refuge alternative will be (b) Escapeways shall be provided marked with a rigid spiraled coil at from each working section continuous least eight inches in length. The spi- to the surface. raled coil must be placed within reach (c) Each escapeway shall be— of the lifeline.

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(d) Surface openings shall be ade- shall be equipped with brakes that can quately protected to prevent surface stop the fully loaded platform, cage, or fires, fumes, smoke, and flood water other device. from entering the mine. (c) Mechanical escape facilities, in- (e) Primary escapeway. One escapeway cluding automatic elevators, shall be that shall be ventilated with intake air examined weekly. The weekly exam- shall be designated as the primary ination of this equipment may be con- escapeway. The primary escapeway ducted at the same time as a daily ex- shall have a higher ventilation pres- amination required by § 75.1400–3. sure than the belt entry unless the (1) The weekly examination shall in- mine operator submits an alternative clude an examination of the headgear, in the mine ventilation plan to protect connections, links and chains, over- the integrity of the primary speed and overwind controls, auto- escapeway, based on mine specific con- matic stop controls, and other facili- ditions, which is approved by the dis- ties. trict manager. (2) At least once each week, the hoist (f) Alternate escapeway. One shall be run through one complete escapeway that shall be designated as cycle of operation to determine that it the alternate escapeway shall be separated from the primary escapeway for is operating properly. its entire length. (d) A person trained to operate the (g) Mechanical escape facilities shall mechanical escape facility always shall be provided— be available while anyone is under- (1) For each shaft or slope opening ground to provide the mechanical es- that is part of a primary escapeway; cape facilities, if required, to the bot- and tom of each shaft and slope opening (2) For slopes that are part of that is part of an escapeway within 30 escapeways, unless ladders are in- minutes after personnel on the surface stalled. have been notified of an emergency re- (h) Within 30 minutes after mine per- quiring evacuation. However, no oper- sonnel on the surface have been noti- ator is required for automatically oper- fied of an emergency requiring evacu- ated cages, platforms, or elevators. ation, mechanical escape facilities (e) Mechanical escape facilities shall shall be operational at the bottom of have rated capacities consistent with each shaft and slope opening that is the loads handled. part of an escapeway. (f) Manually-operated mechanical es- (i) Except where automatically acti- cape facilities shall be equipped with vated hoisting equipment is used, the indicators that accurately and reliably bottom of each shaft or slope opening show the position of the facility. that is part of a primary escapeway (g) Certification. The person making shall be equipped with a means of sig- the examination as required by para- naling a surface location where a per- graph (c) of this section shall certify by son is always on duty when anyone is initials, date, and the time that the ex- underground. When the signal is acti- amination was made. Certifications vated or the evacuation of personnel is shall be made at or near the facility ex- necessary, the person on duty shall as- amined. sure that mechanical escape facilities are operational as required by para- § 75.384 Longwall and shortwall graph (h) of this section. travelways. [61 FR 9829, Mar. 11, 1996, as amended at 71 (a) If longwall or shortwall mining FR 12269, Mar. 9, 2006; 71 FR 71452, Dec. 8, systems are used and the two des- 2006; 73 FR 80614, Dec. 31, 2008] ignated escapeways required by § 75.380 are located on the headgate side of the § 75.382 Mechanical escape facilities. longwall or shortwall, a travelway (a) Mechanical escape facilities shall shall be provided on the tailgate side of be provided with overspeed, overwind, that longwall or shortwall. The and automatic stop controls. travelway shall be located to follow the (b) Every mechanical escape facility most direct and safe practical route to with a platform, cage, or other device a designated escapeway.

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(b) The route of travel shall be clear- (3) At least 20 feet in depth in ad- ly marked. vance of the working face, and always (c) When a roof fall or other blockage maintained to a distance of 10 feet in occurs that prevents travel in the advance of the working face. travelway— (c) Boreholes shall be drilled in both (1) Work shall cease on the longwall ribs of advancing working places de- or shortwall face; scribed in paragraph (a) of this section (2) Miners shall be withdrawn from unless an alternative drilling plan is face areas to a safe area outby the sec- approved by the District Manager in tion loading point; and accordance with paragraph (g) of this (3) MSHA shall be notified. section. These boreholes shall be (d) Work may resume on the longwall drilled— or shortwall face after the procedures (1) At an angle of 45 degrees to the di- set out in §§ 75.215 and 75.222 are imple- rection of advance; mented. (2) At least 20 feet in depth; and (3) At intervals not to exceed 8 feet. § 75.385 Opening new mines. (d) When a borehole penetrates an area that cannot be examined, and be- When new mines are opened, no more fore mining continues, a certified per- than 20 miners at a time shall be al- son shall, if possible, determine— lowed in any mine until a connection (1) The direction of airflow in the has been made between the mine open- borehole; ings, and these connections shall be (2) The pressure differential between made as soon as possible. the penetrated area and the mine § 75.386 Final mining of pillars. workings; (3) The concentrations of methane, When only one mine opening is avail- oxygen, carbon monoxide, and carbon able due to final mining of pillars, no dioxide; and more than 20 miners at a time shall be (4) Whether water is impounded with- allowed in the mine, and the distance in the penetrated area. between the mine opening and working (e) Unless action is taken to dewater face shall not exceed 500 feet. or to ventilate penetrated areas, boreholes shall be plugged with wooden § 75.388 Boreholes in advance of mining. plugs or similar devices when— (1) Tests conducted at the boreholes (a) Boreholes shall be drilled in each show that the atmosphere in the pene- advancing working place when the trated area contains more than 1.0 per- working place approaches— cent methane, less than 19.5 percent (1) To within 50 feet of any area lo- oxygen, or harmful concentrations of cated in the mine as shown by surveys carbon monoxide, carbon dioxide or that are certified by a registered engi- other explosive, harmful or noxious neer or registered surveyor unless the gases; area has been preshift examined; (2) Tests for methane, oxygen, carbon (2) To within 200 feet of any area lo- monoxide, and carbon dioxide cannot cated in the mine not shown by surveys be made because air from mine work- that are certified by a registered engi- ings is flowing into the penetrated neer or registered surveyor unless the area; or area has been preshift examined; or (3) Water is discharging through the (3) To within 200 feet of any mine boreholes from the penetrated area workings of an adjacent mine located into the mine workings. in the same coalbed unless the mine (f) If mining is to be conducted with- workings have been preshift examined. in 50 feet above or below an inacces- (b) Boreholes shall be drilled as fol- sible area of another mine, boreholes lows: shall be drilled, as necessary, according (1) Into the working face, parallel to to a plan approved by the district man- the rib, and within 3 feet of each rib. ager. (2) Into the working face, parallel to (g) Alternative borehole patterns the rib, and at intervals across the face that provide the same protection to not to exceed 8 feet. miners as the pattern established by

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paragraphs (b) and (c) of this section Subpart E—Combustible Materials may be used under a plan approved by and Rock Dusting the district manager. § 75.400 Accumulation of combustible § 75.389 Mining into inaccessible areas. materials. (a) (1) The operator shall develop and Coal dust, including float coal dust follow a plan for mining into areas pen- deposited on rock-dusted surfaces, etrated by boreholes drilled under loose coal, and other combustible ma- § 75.388. terials, shall be cleaned up and not be (2) Mining shall not resume into any permitted to accumulate in active area penetrated by boreholes until con- workings, or on diesel-powered and ditions in the penetrated area can be electric equipment therein. determined under § 75.388 and the plan [61 FR 55527, Oct. 25, 1996] for mining-through into the area has been approved by the district manager. § 75.400–1 Definitions. (3) A copy of the procedures to be fol- (a) The term coal dust means par- lowed shall be posted near the site of ticles of coal that can pass a No. 20 the mining-through operations and the sieve. operator shall explain these procedures (b) The term float coal dust means the to all miners involved in the oper- coal dust consisting of particles of coal ations. that can pass a No. 200 sieve. (b) The procedures specified in the (c) The term loose coal means coal fragments larger in size than coal dust. plan shall include— (1) The method of ventilation, ven- § 75.400–2 Cleanup program. tilation controls, and the air quantities A program for regular cleanup and and velocities in the affected working removal of accumulations of coal and section and working place; float coal dusts, loose coal, and other (2) Dewatering procedures to be used combustibles shall be established and if a penetrated area contains a water maintained. Such program shall be accumulation; and available to the Secretary or author- (3) The procedures and precautions to ized representative. be followed during mining-through operations. § 75.401 Abatement of dust; water or (c) Except for routine mining- water with a wetting agent. through operations that are part of a [STATUTORY PROVISION] retreat section ventilation system approved in accordance with § 75.371(f) Where underground mining oper- and (x), the following provisions shall ations in active workings create or apply: raise excessive amounts of dust, water (1) Before and during mining-through or water with a wetting agent added to operations, a certified person shall per- it, or other no less effective methods approved by the Secretary or his au- form air quality tests at intervals and thorized representative, shall be used at locations necessary to protect the to abate such dust. In working places, safety of the miners. particularly in distances less than 40 (2) During mining-through oper- feet from the face, water, with or with- ations, only persons involved in these out a wetting agent, or other no less ef- operations shall be permitted in the fective methods approved by the Sec- mine; and retary or his authorized representative, (3) After mining-through, a certified shall be applied to coal dust on the person shall determine that the af- ribs, roof, and floor to reduce fected areas are safe before any persons dispersibility and to minimize the ex- enter the underground areas of the plosion hazard. mine. § 75.401–1 Excessive amounts of dust. The term ‘‘excessive amounts of dust’’ means coal and float coal dust in

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the air in such amounts as to create § 75.404 Exemption of anthracite the potential of an explosion hazard. mines.

§ 75.402 Rock dusting. [STATUTORY PROVISION]

[STATUTORY PROVISION] Sections 75.401, 75.402, and 75.403 shall not apply to underground anthracite All underground areas of a coal mine, mines. except those areas in which the dust is too wet or too high in incombustible content to propagate an explosion, Subpart F—Electrical Equipment— shall be rock dusted to within 40 feet of General all working faces, unless such areas are inaccessible or unsafe to enter or un- § 75.500 Permissible electric equipment. less the Secretary or his authorized representative permits an exception [STATUTORY PROVISION] upon his finding that such exception will not pose a hazard to the miners. On and after March 30, 1971: All crosscuts that are less than 40 feet (a) All junction or distribution boxes from a working face shall also be rock used for making multiple power con- dusted. nections inby the last open crosscut shall be permissible; § 75.402–1 Definition. (b) All handheld electric drills, blow- The term too wet means that suffi- er and exhaust fans, electric pumps, cient natural moisture is retained by and such other low horsepower electric the dust that when a ball of finely di- face equipment as the Secretary may vided material is squeezed in the hands designate on or before May 30, 1970, water is exuded. which are taken into or used inby the last open crosscut of any coal mine § 75.402–2 Exceptions. shall be permissible; Exceptions granted under § 75.402 by (c) All electric face equipment which the Secretary or his authorized rep- is taken into or used inby the last open resentative shall be reviewed periodi- crosscut of any coal mine classified cally. under any provision of law as gassy prior to March 30, 1970, shall be permis- § 75.403 Maintenance of incombustible sible; and content of rock dust. (d) All other electric face equipment Where rock dust is required to be ap- which is taken into or used inby the plied, it shall be distributed upon the last crosscut of any coal mine, except a top, floor, and sides of all underground coal mine referred to in § 75.501, which areas of a coal mine and maintained in has not been classified under any provi- such quantities that the incombustible sion of law as a gassy mine prior to content of the combined coal dust, March 30, 1970, shall be permissible. rock dust, and other dust shall be not less than 80 percent. Where methane is § 75.500–1 Other low horsepower elec- present in any ventilating current, the tric face equipment. percent of incombustible content of such combined dust shall be increased Other low horsepower electric face 0.4 percent for each 0.1 percent of meth- equipment designated pursuant to the ane. provisions of § 75.500(b) is all other electric-driven mine equipment, except low [75 FR 57857, Sept. 23, 2010; 76 FR 35978, June horsepower rock dusting equipment, 21, 2011] and employs an electric current sup- § 75.403–1 Incombustible content. plied by either a power conductor or battery and consumes not more than Moisture contained in the combined 2,250 watts of electricity and which is coal dust, rock dust and other dusts taken into or used inby the last open shall be considered as a part of the in- crosscut. combustible content of such mixture.

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§ 75.501 Permissible electric face § 75.501–3 New openings; mines above equipment; coal seams above water water table and never classed table. gassy. (a) Where a new opening(s) is pro- [STATUTORY PROVISION] posed to be developed by shaft, slope, On and after March 30, 1974, all elec- or drift from the surface to, or in, any tric face equipment, other than equip- coalbed and the operator considers such proposed new opening(s) to be a ment referred to in paragraph (b) of part of a mine coming under section § 75.500, which is taken into and used 305(a)(2) of the Act and § 75.501 the oper- inby the last open crosscut of any coal ator shall so notify the District Man- mine which is operated entirely in coal ager for the District in which the mine seams located above the water table is located in writing prior to the date and which has not been classified under any actual development (in coal) any provision of law as a gassy mine through such opening(s) is undertaken. prior to March 30, 1970, and in which Such notification shall include the fol- one or more openings were made prior lowing information: to December 30, 1969, shall be permis- (1) Name, address, and identification sible. number of the existing mine. (2) A current map of the existing § 75.501–1 Coal seams above the water mine clearly setting out the proposed table. new opening(s), mining plan and As used in § 75.501, the phrase ‘‘coal planned interconnection, if any, with seams above the water table’’ means existing workings. coal seams in a mine which are located (3) A statement as to when the operator obtained the right to mine the at an elevation above a river or the coal which the proposed new opening(s) tributary of a river into which a local will traverse. surface water system naturally drains. (4) The name of the coalbeds currently being mined and those which the § 75.501–2 Permissible electric face equipment. new opening(s) will traverse. (5) The expected life of the mine. (a) On and after March 30, 1971, in (6) The reason(s) for the proposed new mines operated entirely in coal seams opening(s) (for example, haulage, ven- which are located at elevations above tilation, drainage, to avoid bad roof, the water table: escapeway). (1) All junction or distribution boxes The District Manager shall require sub- used for making multiple power con- mission of any additional information nections inby the last open crosscut he considers pertinent. shall be permissible; and (b) The District Manager shall make (2) All handheld electric drills, blow- a determination based on all of the iner and exhaust fans, electric pumps, formation submitted by the operator as and all other electric-driven mine to whether the proposed new opening(s) equipment, except low horsepower rock will be considered as a part of the ex- dusting equipment, that employs an isting mine or as a new mine. The fol- electric current supplied by either a lowing guidelines and criteria shall be power conductor or battery and con- used by the District Manager in mak- sumes not more than 2,250 watts of ing his determination: (1) The effect that the proposed new electricity, which is taken into or used opening(s) will have on the safety of inby the last open crosscut shall be the men working in the existing mine permissible. shall be considered of primary impor- (b) On and after March 30, 1974, in tance. mines operated entirely in coal seams (2) Whether the operator had a right which are located at elevations above to mine the coal which the proposed the water table, all electric face equip- new openings will traverse prior to the ment which is taken into or used inby date of enactment of the Act (Decem- the last crosscut shall be permissible. ber 30, 1969) and whether the original mining plan included mining such coal.

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(3) Whether, in accordance with the § 75.503–1 Statement listing all electric usual mining practices common to the face equipment. particular district, the proposed new Each operator of a coal mine shall openings would have been considered a complete and file Mine Safety and new mine or part of the existing mine. Health Administration Form No. 6–1496 A number of factors will be considered entitled ‘‘Coal Operator’s Electrical including, but not limited to: Survey’’ and Form 6–1496 Supplemental (i) The relationship between the coal- entitled ‘‘Operator’s Survey of Elec- beds currently being mined, and those trical Face Equipment.’’ Forms may be proposed to be mined; obtained from any MSHA Coal Mine (ii) The distance between existing Safety and Health district office. Sepa- openings and the proposed new open- rate forms shall be filed for each mine. ing(s); Copies one and two of the completed (iii) The projected time elapsing be- form shall be filed with the Coal Mine tween the start of the new opening(s) District Manager for the district in and planned interconnection, if any, which each mine is located on or before with the existing mine; and May 30, 1970. An operator must list all (iv) The projected tonnage of coal electric face equipment being used at which is expected to be mined prior to each mine as of the time of filing, all interconnection where interconnection such equipment being repaired, and all is planned. standby electric equipment stored at or The District Manager shall notify the in the mine which the operator intends operator in writing within 30 days of to use as face equipment. receiving all of the information, re- [35 FR 17890, Nov. 20, 1970, as amended at 71 quired and requested, of his determina- FR 16668, Apr. 3, 2006] tion. No informal notification shall be given. § 75.504 Permissibility of new, replace- (c) All new opening(s) shall be oper- ment, used, reconditioned, additional, and rebuilt electric face ated as a new mine prior to receiving a equipment. written notification from the District Manager that such new opening(s) will On and after March 30, 1971, all new, be considered part of an existing mine replacement, used, reconditioned, and coming under section 305(a)(2) of the additional electric face equipment used Act and § 75.501. in any mine referred to in §§ 75.500, (d) Nothing in this § 75.501–3 shall be 75.501, and 75.503 shall be permissible construed to relieve the operator from and shall be maintained in a permis- compliance with any of the mandatory sible condition, and in the event of any standards contained in this Part 75. major overhaul of any item of electric face equipment in use on or after [37 FR 8949, May 3, 1972] March 30, 1971, such equipment shall be put in, and thereafter maintained in, a § 75.502 Permits for noncompliance. permissible condition, unless in the An operator need not comply with opinion of the Secretary, such equip- paragraph (d) of § 75.500 or with § 75.501 ment or necessary replacement parts during the period of time specified in a are not available. permit issued by the Interim Compli- [38 FR 4975, Feb. 23, 1973] ance Panel established by the Act. § 75.505 Mines classed gassy; use and § 75.503 Permissible electric face maintenance of permissible electric equipment; maintenance. face equipment.

[STATUTORY PROVISIONS] [STATUTORY PROVISION] The operator of each coal mine shall Any coal mine which, prior to March maintain in permissible condition all 30, 1970, was classed gassy under any electric face equipment required by provision of law and was required to §§ 75.500, 75.501, 75.504 to be permissible use permissible electric face equipment which is taken into or used inby the and to maintain such equipment in a last open crosscut of any such mine. permissible condition shall continue to

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use such equipment and to maintain (4) Flame Safety Lamps; such equipment in such condition. (5) Portable Methane Detectors, part 22; § 75.506 Electric face equipment; re- (6) Telephone and Signaling Devices, quirements for permissibility. part 23; (a) Electric-driven mine equipment (7) Single-Shot Blasting Units; and accessories manufactured on or (8) Lighting Equipment for Illu- after March 30, 1973, will be permissible electric face equipment only (1) if they minating Underground Workings; are fabricated, assembled, or built (9) Methane-Monitoring Systems, under an approval, or any extension part 27; and thereof, issued by the Bureau of Mines (10) Continuous Duty, Warning Light, or the Mine Safety and Health Admin- Portable Methane Detectors, 30 CFR istration in accordance with schedule part 29 contained in the 30 CFR, parts 2G, or any subsequent Bureau of Mines 1–199, edition, revised as of July 1, 1999. schedule promulgated by the Secretary after March 30, 1970, which amends, [35 FR 17890, Nov. 20, 1970, as amended at 63 FR 47119, Sept. 3, 1998; 64 FR 43283, Aug. 10, modifies, or supersedes the permissi- 1999; 71 FR 16668, Apr. 3, 2006] bility requirements of schedule 2G, and (2) if they are maintained in a permis- § 75.506–1 Electric face equipment; sible condition. permissible condition; maintenance (b) Except as provided in paragraph requirements. (c) of this § 75.506 electric-driven mine equipment and accessories manufac- (a) Except as provided in paragraph tured prior to March 30, 1973, will be (b) of this section, electric face equip- permissible electric face equipment (1) ment which meets the requirements for if they were fabricated, assembled, or permissibility set forth in § 75.506 will built under an approval, or any exten- be considered to be in permissible con- sion thereof, issued by the Bureau of dition only if it is maintained so as to Mines in accordance with the schedules meet the requirements for permissi- set forth below, and (2) if they are bility set forth in the Bureau of Mines maintained in a permissible condition. schedule under which such electric face Bureau of Mines Schedule 2D, May 23, 1936; equipment was initially approved, or, if Bureau of Mines Schedule 2E, February 15, the equipment has been modified, it is 1945; maintained so as to meet the require- Bureau of Mines Schedule 2F, August 3, 1955; ments of the schedule under which and such modification was approved. Bureau of Mines Schedule 2G, March 19, 1968. (b) Electric face equipment bearing Copies of these schedules are available the Bureau of Mines approval number at all MSHA Coal Mine Safety and listed in Appendix A of this subpart Health district offices. will be considered to be in permissible (c) Electric driven mine equipment condition only if it is maintained so as and accessories bearing the Bureau of to meet the requirements for permissi- Mines approval numbers listed in Ap- bility set forth in Bureau of Mines pendix A to this subpart are permis- Schedule 2D or, if such equipment has sible electric face equipment only if been modified, it is maintained so as to they are maintained in a permissible meet the requirements of the schedule condition. under which the modification was ap- (d) The following equipment will be proved. permissible electric face equipment only if it is approved under the appro- (c) Notwithstanding the provisions of priate parts of this chapter, or former paragraphs (a) and (b) of this section, Bureau of Mines’ approval schedules, where the minimum requirements for and if it is in permissible condition: permissibility set forth in the appro- (1) Multiple-Shot Blasting Units, part priate Bureau of Mines schedule under 7 subpart D; which such equipment or modifications (2) Electric Cap Lamps, part 19; were approved have been superseded by (3) Electric Mine Lamps Other than the requirements of this Part 75, the Standard Cap Lamps, part 20; latter requirements shall be applicable.

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§ 75.507 Power connection points. § 75.508–1 Mine tracks. When mine track is used as a con- [STATUTORY PROVISIONS] ductor of a trolley system, the location Except where permissible power con- of such track shall be shown on the nection units are used, all power-con- map required by § 75.508, with a nota- nection points outby the last open tion of the number of rails and the size crosscut shall be in intake air. of such track expressed in pounds per yard. § 75.507–1 Electric equipment other than power-connection points; § 75.508–2 Changes in electric system outby the last open crosscut; return map; recording. air; permissibility requirements. Changes made in the location, elec- (a) All electric equipment, other than trical rating or setting within the mine power-connection points, used in re- electrical system shall be recorded on turn air outby the last open crosscut in the map of such system no later than any coal mine shall be permissible ex- the end of the next workday following cept as provided in paragraphs (b) and completion of such changes. (c) of this section. (b) Notwithstanding the provisions of § 75.509 Electric power circuit and paragraph (a) of this section, in any electric equipment; deenergization. coal mine where nonpermissible elec- [STATUTORY PROVISIONS] tric face equipment may be taken into or used inby the last open crosscut All power circuits and electric equip- until March 30, 1974, such nonpermis- ment shall be deenergized before work sible electric face equipment may be is done on such circuits and equipment, used in return air outby the last open except when necessary for trouble crosscut. shooting or testing. (c) Notwithstanding the provisions of paragraph (a) of this section, in any § 75.510 Energized trolley wires; re- coal mine where a permit for non- pair. compliance is in effect, nonpermissible [STATUTORY PROVISIONS] electric face equipment specified in such permit for noncompliance may be Energized trolley wires may be re- used in return air outby the last open paired only by a person trained to per- crosscut for the duration of such perform electrical work and to maintain mit. electrical equipment and the operator of a mine shall require that such per- [38 FR 4975, Feb. 23, 1973] son wear approved and tested insulated shoes and wireman’s gloves. § 75.508 Map of electrical system. § 75.510–1 Repair of energized trolley [STATUTORY PROVISIONS] wires; training. The location and the electrical rating The training referred to in § 75.510 of all stationary electric apparatus in must include training in the repair and connection with the mine electric sys- maintenance of live trolley wires, and tem, including permanent cables, in the hazards involved in making such switchgear, rectifying substations, repairs, and in the limitations of pro- transformers, permanent pumps, and tective clothing used to protect against trolley wires and trolley feeder wires, such hazards. and settings of all direct-current circuit breakers protecting underground § 75.511 Low-, medium-, or high-volt- trolley circuits, shall be shown on a age distribution circuits and equip- mine map. Any changes made in a loca- ment; repair. tion, electric rating, or setting shall be [STATUTORY PROVISION] promptly shown on the map when the change is made. Such map shall be No electrical work shall be performed available to an authorized representa- on low-, medium-, or high-voltage dis- tive of the Secretary and to the miners tribution circuits or equipment, except in such mine. by a qualified person or by a person

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trained to perform electrical work and sulting from normal operation will not to maintain electrical equipment under damage the insulating materials. the direct supervision of a qualified person. Disconnecting devices shall be § 75.513–1 Electric conductor; size. locked out and suitably tagged by the An electric conductor is not of suffi- persons who perform such work, except cient size to have adequate carrying that in cases where locking out is not capacity if it is smaller than is pro- possible, such devices shall be opened and suitably tagged by such persons. vided for in the National Electric Code, Locks or tags shall be removed only by 1968. In addition, equipment and trail- the persons who installed them or, if ing cables that are required to be per- such persons are unavailable, by permissible must meet the requirements sons authorized by the operator or his of the appropriate schedules of the Bu- agent. reau of Mines.

§ 75.511–1 Qualified person. § 75.514 Electrical connections or To be a qualified person within the splices; suitability. meaning of § 75.511, an individual must [STATUTORY PROVISION] meet the requirements of § 75.153. All electrical connections or splices § 75.512 Electric equipment; examina- in conductors shall be mechanically tion, testing and maintenance. and electrically efficient, and suitable [STATUTORY PROVISION] connectors shall be used. All electrical connections or splices in insulated wire All electric equipment shall be fre- shall be reinsulated at least to the quently examined, tested, and properly same degree of protection as the re- maintained by a qualified person to as- mainder of the wire. sure safe operating conditions. When a potentially dangerous condition is § 75.515 Cable fittings; suitability. found on electric equipment, such equipment shall be removed from serv- [STATUTORY PROVISION] ice until such condition is corrected. A record of such examinations shall be Cables shall enter metal frames of kept and made available to an author- motors, splice boxes, and electric com- ized representative of the Secretary partments only through proper fit- and to the miners in such mine. tings. When insulated wires other than [35 FR 17890, Nov. 20, 1970, as amended at 60 cables pass through metal frames, the FR 33723, June 29, 1995] holes shall be substantially bushed with insulated bushings. § 75.512–1 Qualified person. To be a qualified person within the § 75.516 Power wires; support. meaning of § 75.512, an individual must meet the requirements of § 75.153. [STATUTORY PROVISION] All power wires (except trailing ca- § 75.512–2 Frequency of examinations. bles on mobile equipment, specially de- The examinations and tests required signed cables conducting high-voltage by § 75.512 shall be made at least week- power to underground rectifying equip- ly. Permissible equipment shall be ex- ment or transformers, or bare or insu- amined to see that it is in permissible lated ground and return wires) shall be condition. supported on well-insulated insulators § 75.513 Electric conductor; capacity and shall not contact combustible ma- and insulation. terial, roof, or ribs.

[STATUTORY PROVISION] § 75.516–1 Installed insulators. All electric conductors shall be suffi- Well-insulated insulators is inter- cient in size and have adequate current preted to mean well-installed carrying capacity and be of such con- insulators. Insulated J-hooks may be struction that a rise in temperature re- used to suspend insulated power cables

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for temporary installation not exceed- to March 30, 1970, shall be filed with ing 6 months and for permanent instal- the District Manager of the Coal Mine lation of control cables such as may be Safety District in which the mine is lo- used along belt conveyors. cated to permit approval and prompt implementation of such plans. § 75.516–2 Communication wires and cables; installation; insulation; sup- (b) The appropriate District Manager port. shall notify the operator in writing of the approval of a proposed insulation (a) All communication wires shall be supported on insulated hangers or insu- plan. If revisions are required for ap- lated J-hooks. proval, the changes required will be (b) All communication cables shall be specified. insulated as required by § 75.517–1, and (c) An insulation plan shall include shall either be supported on insulated the following information: or uninsulated hangers or J-hooks, or (1) Name and address of the company, securely attached to messenger wires, the mine and the responsible officials; or buried, or otherwise protected (2) Map or diagram indicating loca- against mechanical damage in a man- tion of power wires and cables required ner approved by the Secretary or his to be insulated; authorized representative. (3) Total length of bare power wires (c) All communication wires and ca- and cables required to be insulated; bles installed in track entries shall, ex- (4) Schedule for the replacement or cept when a communication cable is insulation of bare power wires and ca- buried in accordance with paragraph bles; (b) of this section, be installed on the side of the entry opposite to trolley (5) Type of insulation to be used and wires and trolley feeder wires. Addi- the voltage rating as indicated by the tional insulation shall be provided for manufacturer. communication circuits at points (d) The District Manager shall be where they pass over or under any guided by the following criteria in ap- power conductor. proving insulation plans on a mine-by- (d) For purposes of this section, com- mine basis. Insulation not conforming munication cable means two or more to these criteria may be approved pro- insulated conductors covered by an ad- vided the operator can satisfy the Mine ditional abrasion-resistant covering. Safety and Health Administration that [38 FR 4975, Feb. 23, 1973] the insulation will provide no less than the same measure of protection. § 75.517 Power wires and cables; insu- (1) Insulation shall be adequate for lation and protection. the applied voltage of the circuit. (2) When tubing is used to insulate [STATUTORY PROVISIONS] existing power wires and cables, it Power wires and cables, except trol- shall have a dielectric strength at least ley wires, trolley feeder wires, and bare equal to the voltage of the circuit. signal wires, shall be insulated ade- When the tubing is split for purposes of quately and fully protected. installation, the joints shall be effectively sealed. The butt ends may be § 75.517–1 Power wires and cables; insulation and protection. sealed with a moisture resistant insulating tape. Power wires and cables installed on (3) When tape is used to insulate ex- or after March 30, 1970, shall have insu- isting power wires and cables, it shall lation with a dielectric strength at least equal to the voltage of the cir- be applied half-lapped and one thick- cuit. ness of the tape shall have a dielectric strength at least equal to the voltage § 75.517–2 Plans for insulation of exist- of the circuit. The tape shall be self-ad- ing bare power wires and cables. hesive and moisture resistant. (a) On or before December 31, 1970, plans for the insulation of existing bare power wires and cables installed prior

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§ 75.518 Electric equipment and cir- § 75.519–1 Main power circuits; dis- cuits; overload and short circuit connecting switches; locations. protection. Section 75.519 requires (a) that a disconnecting switch be installed on the [STATUTORY PROVISION] surface at a point within 500 feet of the Automatic circuit-breaking devices place where the main power circuit en- or fuses of the correct type and capac- ters the underground area of a mine, ity shall be installed so as to protect and (b) that, in an instance on which a all electric equipment and circuits main power circuit enters the under- against short circuit and overloads. ground area through a shaft or bore- Three-phase motors on all electric hole, a disconnecting switch be in- equipment shall be provided with over- stalled underground within 500 feet of the bottom of the shaft or borehole. load protection that will deenergize all three phases in the event that any § 75.520 Electric equipment; switches. phase is overloaded. [STATUTORY PROVISION] § 75.518–1 Electric equipment and circuits; overload and short circuit All electric equipment shall be pro- protection; minimum requirements. vided with switches or other controls that are safely designed, constructed, A device to provide either short cir- and installed. cuit protection or protection against overload which does not conform to the § 75.521 Lightning arresters; provisions of the National Electric ungrounded and exposed power Code, 1968, does not meet the require- conductors and telephone wires. ment of § 75.518. In addition, such de- Each ungrounded, exposed power con- vices on electric face equipment and ductor and each ungrounded, exposed trailing cables that are required to be telephone wire that leads underground permissible must meet the require- shall be equipped with suitable light- ments of the applicable schedules of ning arresters of approved type within the Bureau of Mines. 100 feet of the point where the circuit enters the mine. Lightning arresters § 75.518–2 Incandescent lamps, over- shall be connected to a low resistance load and short circuit protection. grounding medium on the surface Incandescent lamps installed along which shall be separated from neutral haulageways and at other locations, grounds by a distance of not less than not contacting combustible material, 25 feet. and powered from trolley or direct cur- [38 FR 4975, Feb. 23, 1973] rent feeder circuits, need not be provided with separate short circuit or § 75.522 Lighting devices. overload protection, if the lamp is not [STATUTORY PROVISION] more than 8 feet in distance from such circuits. No device for the purpose of lighting any coal mine which has not been ap- § 75.519 Main power circuits; dis- proved by the Secretary or his author- connecting switches. ized representative shall be permitted in such mine. [STATUTORY PROVISION] § 75.522–1 Incandescent and fluores- In all main power circuits, dis- cent lamps. connecting switches shall be installed (a) Except for areas of a coal mine underground within 500 feet of the bot- inby the last open crosscut, incandes- toms of shafts and boreholes through cent lamps may be used to illuminate which main power circuits enter the underground areas. When incandescent underground area of the mine and lamps are used in a track entry or belt within 500 feet of all other places where entry or near track entries to illu- main power circuits enter the under- minate special areas other than struc- ground area of the mine. tures, the lamps shall be installed in

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weather-proof sockets located in posi- (c) An operator may apply to the Di- tions such that the lamps will not rector of Technical Support, Mine come in contact with any combustible Safety and Health Administration, De- material. Lamps used in all other partment of Labor, 201 12th Street places must be of substantial construc- South, Arlington, VA 22202–5452; 202– tion and be fitted with a glass enclo- 693–9440; for approval of the installa- sure. tion of devices to be used in lieu of de- (b) Incandescent lamps within glass vices that will quickly deenergize the enclosures or fluorescent lamps may be tramming motors of self-propelled elec- used inside underground structures (ex- tric face equipment in the event of an cept magazines used for the storage of emergency. The Director of Technical explosives and detonators). In under- Support may approve such devices if he ground structures lighting circuits determines that the performance there- shall consist of cables installed on of will be no less effective than the per- insulators or insulated wires installed in metallic conduit or metallic armor. formance requirements specified in § 75.523–2. § 75.523 Electric face equipment; [38 FR 3407, Feb. 6, 1973, as amended at 39 FR deenergization. 27557, July 30, 1974; 43 FR 12320, Mar. 24, 1978; 47 FR 28096, June 29, 1982; 67 FR 38386, June [STATUTORY PROVISION] 4, 2002; 80 FR 52992, Sept. 2, 2015] An authorized representative of the Secretary may require in any mine § 75.523–2 Deenergization of self-pro- that electric face equipment be propelled electric face equipment; per- vided with devices that will permit the formance requirements. equipment to be deenergized quickly in (a) Deenergization of the tramming the event of an emergency. motors of self-propelled electric face equipment, required by paragraph (a) § 75.523–1 Deenergization of self-proof § 75.523–1, shall be provided by: pelled electric face equipment installation requirements. (1) Mechanical actuation of an existing pushbutton emergency stopswitch, (a) Except as provided in paragraphs (2) Mechanical actuation of an exist- (b) and (c) of this section, all self-propelled electric face equipment which is ing lever emergency stopswitch, or used in the active workings of each un- (3) The addition of a separate derground coal mine on and after electromechanical switch assembly. March 1, 1973, shall, in accordance with (b) The existing emergency the schedule of time specified in para- stopswitch or additional switch assem- graphs (a) (1) and (2) of this section, be bly shall be actuated by a bar or lever provided with a device that will quick- which shall extend a sufficient distance ly deenergize the tramming motors of in each direction to permit quick the equipment in the event of an emer- deenergization of the tramming motors gency. The requirements of this para- of self-propelled electric face equip- graph (a) shall be met as follows: ment from all locations from which the (1) On and after December 15, 1974, for equipment can be operated. self-propelled cutting machines, shut- (c) Movement of not more than 2 tle cars, battery-powered machines, inches of the actuating bar or lever re- and roof drills and bolters; sulting from the application of not (2) On and after February 15, 1975, for more than 15 pounds of force upon con- all other types of self-propelled electric tact with any portion of the equipment face equipment. operator’s body at any point along the (b) Self-propelled electric face equip- length of the actuating bar or lever ment that is equipped with a substan- shall cause deenergization of the tially constructed cab which meets the requirements of this part, shall not be tramming motors of the self-propelled required to be provided with a device electric face equipment. that will quickly deenergize the [38 FR 3406, Feb. 6, 1973; 38 FR 4394, Feb. 14, tramming motors of the equipment in 1973] the event of an emergency.

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§ 75.523–3 Automatic emergency-park- shall be applied when the equipment ing brakes. operator is not at the controls of the (a) Except for personnel carriers, rub- equipment, except during movement of ber-tired, self-propelled electric haul- disabled equipment. age equipment used in the active work- [54 FR 12412, Mar. 24, 1989] ings of underground coal mines shall be equipped with automatic emergency- § 75.524 Electric face equipment; elec- parking brakes in accordance with the tric equipment used in return air following schedule. outby the last open crosscut; max- (1) On and after May 23, 1989— imum level of alternating or direct (i) All new equipment ordered; and electric current between frames of equipment. (ii) All equipment originally furnished with or retrofitted with auto- The maximum level of alternating or matic emergency-parking brakes which direct electric current that exists be- meet the requirements of this section. tween the frames of any two units of (2) On and after May 23, 1991, all electric face equipment that come in other equipment. contact with each other in the working (b) Automatic emergency-parking places of a coal mine, or between the brakes shall— frames of any two units of electric (1) Be activated immediately by the equipment that come in contact with emergency deenergization device re- each other in return air outby the last quired by 30 CFR 75.523–1 and 75.523–2; open crosscut, shall not exceed one am- (2) Engage automatically within 5.0 pere as determined from the voltage seconds when the equipment is deener- measured across a 0.1 ohm resistor con- gized; nected between the frames of such (3) Safely bring the equipment when equipment. fully loaded to a complete stop on the [38 FR 29998, Oct. 31, 1973] maximum grade on which it is operated; APPENDIX A TO SUBPART F OF PART 75— (4) Hold the equipment stationary de- LIST OF PERMISSIBLE ELECTRIC spite any contraction of brake parts, FACE EQUIPMENT APPROVED BY THE exhaustion of any non-mechanical BUREAU OF MINES PRIOR TO MAY 23, source of energy, or leakage; and 1936 (5) Release only by a manual control Motor-Driven Mine Equipment that does not operate any other equip- (Approved Under Schedules 2, 2A, 2B, and 2C) ment function. (c) Automatic emergency-parking Approval No. Date

brakes shall include a means in the AIR COMPRESSORS equipment operator’s compartment to— 128 ...... March 21, 1927. (1) Apply the brakes manually with- 128A ...... July 16, 1926. out deenergizing the equipment; and COAL DRILLS AND DRILLING MACHINES (2) Release and reengage the brakes Hand Drills without energizing the equipment. (d) On and after November 24, 1989, 109 ...... September 19, 1922. 154 ...... August 1, 1928. rubber-tired, self-propelled electric 184 ...... February 7, 1930. face equipment not covered by para- 227 ...... July 29, 1931. graph (a) of this section shall be 254 ...... July 15, 1933. equipped with a means incorporated on Post Drills the equipment and operable from each tramming station to hold the equip- 119 ...... April 15, 1925. ment stationary— 119A ...... Do. (1) On the maximum grade on which 225 ...... July 10, 1931. 225A ...... Do. it is operated; and 228 ...... August 12, 1931. (2) Despite any contraction of compo- 228A ...... February 17, 1932. nents, exhaustion of any non-mechan- 230 ...... August 20, 1931. ical source of energy, or leakage. 230A ...... Do. 237 ...... December 1, 1931. (e) The brake systems required by 237A ...... Do. paragraphs (a) or (d) of this section

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Motor-Driven Mine Equipment Motor-Driven Mine Equipment (Approved Under Schedules 2, 2A, 2B, and 2C) (Approved Under Schedules 2, 2A, 2B, and 2C)

Approval No. Date Approval No. Date

Drilling Machines Power Units for Conveyors

147 ...... February 8, 1928. 265 ...... February 12, 1934. 147A ...... Do. 265A ...... March 19, 1934. 176 ...... September 9, 1929. 390A ...... March 23, 1934. 176A ...... Do. Shaker Type LOADING AND CONVEYING EQUIPMENT 247 ...... October 21, 1932. LOADING MACHINES 257A ...... August 11, 1933. Unmounted Type 262A ...... December 8, 1933. 271 ...... May 20, 1935. 122 ...... January 8, 1926. 271A ...... October 17, 1934. 122A ...... Do. 274A ...... December 13, 1934. 286A ...... March 12, 1935. Caterpillar-Mounted Type 295 ...... September 20, 1935. 299A ...... April 9, 1936. 150 ...... May 11, 1928. 186 ...... March 15, 1930. Scraper-type Loaders 222 ...... May 8, 1931. 222A ...... July 28, 1931. 138 ...... August 5, 1927. 229 ...... August 17, 1931. 138A ...... Do. 229A ...... Do. 196 ...... September 29, 1930. 235 ...... November 27, 1931. 196A ...... July 26, 1930. 235A ...... October 29, 1931. 226 ...... July 27, 1931. 278 ...... January 17, 1935. 255 ...... July 31, 1933. 278A ...... Do. 256 ...... Do. 283A ...... March 12, 1935. 284A ...... Do. MINING MACHINES, MACHINERY-MOVING EQUIPMENT, 285A ...... Do. MISCELLANEOUS TRUCKS, AND WATER SPRAY SUPPLY UNITS 294 ...... September 18, 1935. MINING MACHINES 300A ...... May 6, 1936. Shortwall Machines 127 ...... July 16, 1926. 127A ...... September 23, 1927. 103 ...... November 2, 1917. 103A ...... Do. Track-Mounted Type 105 ...... February 9, 1922. 105A ...... Do. 194 ...... June 6, 1930. 106 ...... Do. 194A ...... Do. 106A ...... Do. 217 ...... February 27, 1931. 107 ...... Do. 217A ...... Do. 107A ...... Do. 276 ...... January 11, 1935. 108 ...... Do. 277 ...... January 17, 1935. 108A ...... Do. 282A ...... March 12, 1935. 111 ...... October 16, 1922. 291A ...... July 3, 1935. 111A ...... Do. 113 ...... November 4, 1924. Pit-Car Loaders 113A ...... Do. 114 ...... February 7, 1925. 167 ...... March 27, 1929. 114A ...... Do. 167A ...... Do. 115 ...... Do. 175 ...... July 26, 1929. 115A ...... Do. 175A ...... June 24, 1929. 153 ...... July 31, 1928. 250 ...... December 10, 1932. 153A ...... Do. 250A ...... Do. 193 ...... June 3, 1930. 252A ...... February 20, 1933. 193A ...... Do. 197 ...... July 31, 1930. CONVEYORS 197A ...... Do. Belt Type 198 ...... August 1, 1930. 198A ...... Do. 236 ...... November 19, 1931. 201 ...... September 8, 1930. 287A ...... March 12, 1935. 201A ...... Do. 296A ...... January 6, 1936. 204 ...... October 13, 1930. 204A ...... December 13, 1930. Chain Type 223 ...... May 13, 1931. 223A ...... Do. 151 ...... May 19, 1928. 241 ...... March 18, 1932. 209 ...... December 2, 1930. 241A ...... Do. 240 ...... March 12, 1932. 258 ...... August 15, 1933. 240A ...... Do. 259A ...... August 16, 1933. 298A ...... March 3, 1936. 260A ...... August 17, 1933. 273 ...... November 30, 1934.

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Motor-Driven Mine Equipment Motor-Driven Mine Equipment (Approved Under Schedules 2, 2A, 2B, and 2C) (Approved Under Schedules 2, 2A, 2B, and 2C)

Approval No. Date Approval No. Date

288 ...... March 27, 1935. Rock-Dusting Machines 288A ...... Do. 292 ...... September 11, 1935. 130 ...... November 5, 1926. 292A ...... Do. 137 ...... July 2, 1927. 293A ...... Do. 146 ...... January 20, 1928. 146A ...... April 3, 1928. Longwall Machines 180 ...... October 30, 1929. 180A ...... January 17, 1930. 185 ...... February 24, 1930. 206 ...... November 12, 1930. 185A ...... Do. 279 ...... February 14, 1935. 218 ...... March 10, 1931. 218A ...... Do. Room and Car-Spotting Hoists 246 ...... August 19, 1932. 246A ...... Do. 116 ...... February 13, 1925. 261 ...... September 12, 1933. 116A ...... Do. 164 ...... January 21, 1931. Track or caterpillar mounted 164A ...... Do. 165 ...... Do. 112 ...... March 13, 1924. 165A ...... Do. 112A ...... Do. 169 ...... April 5, 1929. 118 ...... March 12, 1925. 169A ...... February 26, 1934. 118A ...... Do. 190 ...... April 20, 1930. 125 ...... April 26, 1926. 251A ...... January 16, 1933. 125A ...... Do. 263 ...... January 11, 1934. 172 ...... April 30, 1929. 266A ...... February 27, 1934. 172A ...... Do. 188 ...... April 15, 1930. STORAGE-BATTERY LOCOMOTIVES AND POWER TRUCKS 188A ...... Do. 207 ...... November 14, 1930. (Approved under Schedules 15, 2C, 2D, and 2E) 207A ...... Do. Gathering Locomotives 216 ...... February 12, 1931. 216A ...... Do. 1501 ...... October 11, 1921. 231 ...... August 31, 1931. 1502 ...... November 13, 1922. 231A ...... Do. 1503 ...... March 24, 1923. 242 ...... April 7, 1932. 1505 ...... April 5, 1924. 244 ...... June 18, 1932. 1507 ...... August 20, 1925. 244A ...... September 20, 1932. 1508 ...... March 21, 1925. 253A ...... February 25, 1933. 1509 ...... September 25, 1925. 267 ...... June 27, 1934. 1511 ...... November 10, 1925. 268A ...... July 25, 1934. 1512 ...... November 11, 1925. 269A ...... September 24, 1934. 1513 ...... February 25, 1926. 280A ...... March 4, 1935. 1516 ...... December 28, 1926. 297 ...... January 27, 1936. 1517 ...... February 10, 1927. 297A ...... Do. 1520 ...... May 27, 1929. 1521 ...... June 13, 1930. Mine Pumps 1522 ...... September 12, 1930. 1523 ...... December 19, 1930. 140 ...... November 1, 1927. 1525 ...... July 25, 1934. 140A ...... Do. 1526 ...... December 20, 1935. 143 ...... Do. 143A ...... Do. Tandem Locomotive 144 ...... Do. 144A ...... Do. 1518 ...... November 21, 1927. 199 ...... August 18, 1930. 199A ...... Do. Power Trucks 208 ...... November 29, 1930. 210 ...... December 15, 1930. 1506 ...... May 5, 1924. 210A ...... Do. 1505A ...... June 21, 1926. 211 ...... December 17, 1930. 1510C ...... December 31, 1926. 211A ...... Do. 1514 ...... December 18, 1926. 213 ...... December 29, 1930. 1515 ...... December 28, 1926. 213A ...... Do. 1512C ...... September 13, 1928. 214 ...... January 2, 1931. 1519C ...... April 6, 1929. 214A ...... Do. 1524C ...... June 25, 1934. 215 ...... Do. 215A ...... Do. JUNCTION, DISTRIBUTION, AND SPLICE BOXES 248 ...... October 31, 1932. (Approved under Schedules 2D and 2E) 248A ...... November 23, 1932. 264 ...... January 31, 1934. Junction Boxes 264A ...... Do. 272 ...... October 23, 1934. 400 ...... June 16, 1928. 272A ...... Do. 400A ...... August 5, 1925. 401 ...... May 11, 1927.

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Motor-Driven Mine Equipment Maximum allowable (Approved Under Schedules 2, 2A, 2B, and 2C) circuit breaker in- Conductor size AWG or MGM stantaneous setting Approval No. Date (amperes)

401A ...... Do. 14 ...... 50 402 ...... Do. 12 ...... 75 402A ...... Do. 10 ...... 150 403 ...... April 14, 1931. 8 ...... 200 403A ...... Do. 6 ...... 300 405A ...... December 4, 1933. 4 ...... 500 3 ...... 600 2 ...... 800 1 ...... 1,000 Subpart G—Trailing Cables 1/0 ...... 1,250 2/0 ...... 1,500 § 75.600 Trailing cables; flame resist- 3/0 ...... 2,000 ance. 4/0 ...... 2,500 250 ...... 2,500 300 ...... 2,500 [STATUTORY PROVISIONS] 350 ...... 2,500 Trailing cables used in coal mines 400 ...... 2,500 450 ...... 2,500 shall meet the requirements estab- 500 ...... 2,500 lished by the Secretary for flame-resistant cables. § 75.601–2 Short circuit protection; use of fuses; approval by the Secretary. § 75.600–1 Approved cables; flame resistance. Fuses shall not be employed to pro- Cables shall be accepted or approved vide short circuit protection for trail- by MSHA as flame resistant. ing cables unless specifically approved by the Secretary. [57 FR 61223, Dec. 23, 1992] § 75.601–3 Short circuit protection; § 75.601 Short circuit protection of dual element fuses; current ratings; trailing cables. maximum values. Dual element fuses having adequate [STATUTORY PROVISIONS] current-interrupting capacity shall Short circuit protection for trailing meet the requirements for short circuit cables shall be provided by an auto- protection of trailing cables as pro- matic circuit breaker or other no less vided in § 75.601, however, the current effective device approved by the Sec- ratings of such devices shall not exceed retary of adequate current-inter- the maximum values specified in this rupting capacity in each ungrounded section: conductor. Disconnecting devices used Single conductor Two conductor to disconnect power from trailing ca- cable cable bles shall be plainly marked and iden- Conductor size (AWG or MGM) Max. Max. tified and such devices shall be Ampacity fuse Ampacity fuse equipped or designed in such a manner rating rating that it can be determined by visual ob- 14 ...... 15 15 servation that the power is discon- 12 ...... 20 20 nected. 10 ...... 25 25 8 ...... 60 60 50 50 § 75.601–1 Short circuit protection; rat- 6 ...... 85 90 65 70 ings and settings of circuit break- 4 ...... 110 110 90 90 3 ...... 130 150 105 110 ers. 2 ...... 150 150 120 125 Circuit breakers providing short cir- 1 ...... 170 175 140 150 1/0 ...... 200 200 170 175 cuit protection for trailing cables shall 2/0 ...... 235 250 195 200 be set so as not to exceed the max- 3/0 ...... 275 300 225 225 imum allowable instantaneous settings 4/0 ...... 315 350 260 300 specified in this section; however, high- 250 ...... 350 350 285 300 300 ...... 395 400 310 350 er settings may be permitted by an au- 350 ...... 445 450 335 350 thorized representative of the Sec- 400 ...... 480 500 360 400 retary when he has determined that 450 ...... 515 600 385 400 special applications are justified: 500 ...... 545 600 415 450

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§ 75.602 Trailing cable junctions. cables from damage and to prevent strain on the electrical connections. [STATUTORY PROVISION] § 75.606 Protection of trailing cables. When two or more trailing cables junction to the same distribution cen- [STATUTORY PROVISIONS] ter, means shall be provided to assure against connecting a trailing cable to Trailing cables shall be adequately the wrong size circuit breaker. protected to prevent damage by mobile equipment. § 75.603 Temporary splice of trailing cable. § 75.607 Breaking trailing cable and power cable connections. [STATUTORY PROVISION] [STATUTORY PROVISIONS] One temporary splice may be made in any trailing cable. Such trailing cable Trailing cable and power cable con- may only be used for the next 24-hour nections to junction boxes shall not be period. No temporary splice shall be made or broken under load. made in a trailing cable within 25 feet of the machine, except cable reel equip- Subpart H—Grounding ment. Temporary splices in trailing cables shall be made in a workmanlike § 75.700 Grounding metallic sheaths, manner and shall be mechanically armors, and conduits enclosing power conductors. strong and well insulated. Trailing cables or hand cables which have exposed [STATUTORY PROVISIONS] wires or which have splices that heat or spark under load shall not be used. All metallic sheaths, armors, and As used in this section, the term conduits enclosing power conductors ‘‘splice’’ means the mechanical joining shall be electrically continuous of one or more conductors that have throughout and shall be grounded by been severed. methods approved by an authorized representative of the Secretary. § 75.604 Permanent splicing of trailing cables. § 75.700–1 Approved methods of grounding. [STATUTORY PROVISIONS] Metallic sheaths, armors and con- When permanent splices in trailing duits in resistance grounded systems cables are made, they shall be: where the enclosed conductors are a (a) Mechanically strong with ade- part of the system will be approved if a quate electrical conductivity and flexi- solid connection is made to the neutral bility; conductor; in all other systems, the (b) Effectively insulated and sealed following methods of grounding will be so as to exclude moisture; and approved: (c) Vulcanized or otherwise treated (a) A solid connection to a borehole with suitable materials to provide casing having low resistance to earth; flame-resistant qualities and good (b) A solid connection to metal bonding to the outer jacket. waterlines having low resistance to earth; (d) Made using splice kits accepted or approved by MSHA as flame resistant. (c) A solid connection to a grounding conductor, other than the neutral con- [35 FR 17890, Nov. 20, 1970, as amended at 57 ductor of a resistance grounded sys- FR 61223, Dec. 23, 1992] tem, extending to a low resistance ground field located on the surface; § 75.605 Clamping of trailing cables to (d) Any other method of grounding, equipment. approved by an authorized representative of the Secretary, which ensures [STATUTORY PROVISIONS] that there is no difference in potential Trailing cables shall be clamped to between such metallic enclosures and machines in a manner to protect the the earth.

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§ 75.701 Grounding metallic frames, § 75.701–3 Approved methods of casings, and other enclosures of grounding metallic frames, casings electric equipment. and other enclosures of electric equipment receiving power from di- [STATUTORY PROVISIONS] rect current power systems with Metallic frames, casings, and other one polarity grounded. enclosures of electric equipment that For the purpose of grounding metal- can become ‘‘alive’’ through failure of lic frames, casings and enclosures of insulation or by contact with energized any electric equipment or device-re- parts shall be grounded by methods ap- ceiving power from a direct-current proved by an authorized representative power system with one polarity of the Secretary. grounded, the following methods of § 75.701–1 Approved methods of grounding will be approved: grounding of equipment receiving (a) A solid connection to the mine power from ungrounded alternating track; current power systems. (b) A solid connection to the ground- For purposes of grounding metallic ed power conductor of the system; frames, casings and other enclosures of (c) Silicon diode grounding; however, equipment receiving power from this method shall be employed only ungrounded alternating current power when such devices are installed in ac- systems, the following methods of cordance with the requirements set grounding will be approved: forth in paragraph (d) of § 75.703–3; and (a) A solid connection between the (d) Any other method, approved by metallic frame, casing, or other metal an authorized representative of the enclosure and the grounded metallic Secretary, which insures that there is sheath, armor, or conduit enclosing the no difference in potential between such power conductor feeding the electrical equipment enclosed; metal enclosures and the earth. (b) A solid connection to a borehole casing having low resistance to earth; § 75.701–4 Grounding wires; capacity of wires. (c) A solid connection to metal waterlines having low resistance to Where grounding wires are used to earth; ground metallic sheaths, armors, con- (d) A solid connection to a grounding duits, frames, casings, and other metal- conductor extending to a low resist- lic enclosures, such grounding wires ance ground field located on the sur- will be approved if: face; (a) The cross-sectional area (size) of (e) Any other method of grounding, the grounding wire is at least one-half approved by an authorized representa- the cross-sectional area (size) of the tive of the Secretary, which ensures power conductor where the power con- that there is no difference in potential ductor used is No. 6 A.W.G., or larger. between such metal enclosures and the earth. (b) Where the power conductor used is less than No. 6 A.W.G., the cross-sec- § 75.701–2 Approved method of ground- tional area (size) of the grounding wire ing metallic frames, casings and is equal to the cross-sectional area other enclosures receiving power (size) of the power conductor. from single-phase 110–220-volt circuit. § 75.701–5 Use of grounding connec- In instances where single-phase 110– tors. 220-volt circuits are used to feed elec- The attachment of grounding wires trical equipment, the only method of to a mine track or other grounded grounding that will be approved is the power conductor will be approved if connection of all metallic frames, cas- separate clamps, suitable for such pur- ings and other enclosures of such equipment to a separate grounding pose, are used and installed to provide conductor which establishes a contin- a solid connection. uous connection to a grounded center tap of the transformer.

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§ 75.702 Protection other than ground- a medium is used, a separate grounding ing. conductor must be employed.

[STATUTORY PROVISIONS] § 75.703–3 Approved methods of grounding offtrack mobile, portable Methods other than grounding which and stationary direct-current ma- provide no less effective protection chines. may be permitted by the Secretary or In grounding offtrack direct-current his authorized representative. machines and the enclosures of their § 75.702–1 Protection other than component parts, the following meth- grounding; approved by an author- ods of grounding will meet the require- ized representative of the Sec- ments of § 75.703: retary. (a) The use of a separate grounding Under this subpart no method other conductor located within the trailing than grounding may be used to ensure cable of mobile and portable equipment against a difference in potential be- and connected between such equipment tween metallic sheaths, armors and and the direct-current grounding me- conduits, enclosing power conductors dium; and frames, casings and metal enclo- (b) The use of a separate ground con- sures of electric equipment, and the ductor located within the direct-cur- earth, unless approved by an author- rent power cable feeding stationary ized representative of the Secretary. equipment and connected between such stationary equipment and the direct- § 75.703 Grounding offtrack direct-cur- current grounding medium; rent machines and the enclosures of (c) The use of a separate external related detached components. ground conductor connected between stationary equipment and the direct- [STATUTORY PROVISIONS] current grounding medium; or, The frames of all offtrack direct-cur- (d) The use of silicon diodes; however, rent machines and the enclosures of re- the installation of such devices shall lated detached components shall be ef- meet the following minimum require- fectively grounded, or otherwise main- ments: tained at no less safe voltages, by (1) Installation of silicon diodes shall methods approved by an authorized be restricted to electric equipment re- representative of the Secretary. ceiving power from a direct-current system with one polarity grounded; § 75.703–1 Approved method of ground- (2) Where such diodes are used on cir- ing. cuits having a nominal voltage rating In instances where the metal frames of 250, they must have a forward cur- both of an offtrack direct-current ma- rent rating of 400 amperes or more, and chine and of the metal frames of its have a peak inverse voltage rating of component parts are grounded to the 400 or more; same grounding medium the require- (3) Where such diodes are used on cir- ments of § 75.703 will be met. cuits having a nominal voltage rating of 550, they must have a forward cur- § 75.703–2 Approved grounding medi- rent rating of 250 amperes or more, and ums. have a peak inverse voltage rating of For purposes of grounding offtrack 800 or more; direct-current machines, the following (4) Where fuses approved by the Sec- grounding mediums are approved: retary are used at the outby end of a (a) The grounded polarity of the di- trailing cable connected to electrical rect-current power system feeding such equipment employing silicon diodes, machines; or, the rating of such fuses must not ex- (b) The alternating current ground- ceed 150 percent of the nominal current ing medium where such machines are rating of the grounding diodes; fed by an ungrounded direct-current (5) Where circuit breakers are used at power system originating in a portable the outby end of a trailing cable con- rectifier receiving its power from a sec- nected to electrical equipment employ- tion power center. However, when such ing silicon diodes, the instantaneous

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trip setting shall not exceed 300 per- § 75.704–1 Approved methods of cent of the nominal current rating of grounding. the grounding diode; The methods of grounding stated in (6) Overcurrent devices must be used § 75.701–1 will also be approved with re- and installed in such a manner that the spect to the grounding of frames of operating coil circuit of the main con- high-voltage equipment referred to in tactor will open when a fault current § 75.704. with a value of 25 percent or less of the diode rating flows through the diode; § 75.705 Work on high-voltage lines; (7) The silicon diode installed must deenergizing and grounding. be suitable to the grounded polarity of [STATUTORY PROVISIONS] the power system in which it is used and its threaded base must be solidly High-voltage lines, both on the sur- connected to the machine frame on face and underground, shall be deener- which it is installed; gized and grounded before work is per- (8) In addition to the grounding formed on them, except that repairs diode, a polarizing diode must be in- may be permitted, in the case of ener- stalled in the machine control circuit gized surface high-voltage lines, if such to prevent operation of the machine repairs are made by a qualified person when the polarity of a trailing cable is in accordance with procedures and reversed; safeguards, including, but not limited to, a requirement that the operator of (9) When installed on permissible such mine provide, test, and maintain equipment, all grounding diodes, over- protective devices in making such re- current devices, and polarizing diodes pairs, to be prescribed by the Secretary must be placed in explosion proof com- prior to March 30, 1970. partments; (10) When grounding diodes are in- § 75.705–1 Work on high-voltage lines. stalled on a continuous miner, their (a) Section 75.705 specifically pro- nominal diode current rating must be hibits work on energized high-voltage at least 750 amperes or more; and, lines underground; (11) All grounding diodes shall be (b) No high-voltage line, either on tested, examined and maintained as the surface or underground, shall be re- electrical equipment in accordance garded as deenergized for the purpose with the provisions of § 75.512. of performing work on it, until it has been determined by a qualified person § 75.703–4 Other methods of protecting (as provided in § 75.153) that such high- offtrack direct-current equipment; voltage line has been deenergized and approved by an authorized representative of the Secretary. grounded. Such qualified person shall by visual observation (1) determine Other methods of maintaining safe that the disconnecting devices on the voltage by preventing a difference be- high-voltage circuit are in open posi- tween the frames of offtract direct-cur- tion and (2) ensure that each rent machines and the earth must be ungrounded conductor of the high-volt- approved by an authorized representa- age circuit upon which work is to be tive of the Secretary. done is properly connected to the system-grounding medium. In the case of § 75.704 Grounding frames of sta- resistance grounded or solid wye-con- tionary high-voltage equipment re- nected systems, the neutral wire is the ceiving power from ungrounded system-grounding medium. In the case delta systems. of an ungrounded power system, either [STATUTORY PROVISIONS] the steel armor or conduit enclosing the system or a surface grounding field The frames of all stationary high- is a system grounding medium; voltage equipment receiving power (c) No work shall be performed on from ungrounded delta systems shall any high-voltage line on the surface be grounded by methods approved by which is supported by any pole or an authorized representative of the structure which also supports other Secretary. high-voltage lines until: (1) All lines

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supported on the pole or structure are (5) Such other information as the deenergized and grounded in accord- person designated by the operator feels ance with all of the provisions of this necessary to describe properly the section which apply to the repair of en- means or methods to be employed in ergized surface high-voltage lines; or such repairs. (2) the provisions of §§ 75.705–2 through 75.705–10 have been complied with, with § 75.705–3 Work on energized high- respect to all lines, which are sup- voltage surface lines; reporting. ported on the pole or structure. Any operator designating and assign- (d) Work may be performed on ener- ing qualified persons to perform repairs gized surface high-voltage lines only in on energized high-voltage surface lines accordance with the provisions of under the provisions of § 75.705–2 shall §§ 75.705–2 through 75.705–10, inclusive. maintain a record of such repairs. Such record shall contain a notation of the § 75.705–2 Repairs to energized surface time, date, location, and general na- high-voltage lines. ture of the repairs made, together with An energized high-voltage surface a copy of the information filed with the line may be repaired only when operator by the qualified person des- (a) The operator has determined that: ignated as responsible for performing (1) Such repairs cannot be scheduled such repairs. during a period when the power circuit § 75.705–4 Simultaneous repairs. could be properly deenergized and grounded; When two or more persons are work- (2) Such repairs will be performed on ing on an energized high-voltage sur- power circuits with a phase-to-phase face line simultaneously, and any one nominal voltage no greater than 15,000 of them is within reach of another, volts; such persons shall not be allowed to work on different phases or on equip- (3) Such repairs on circuits with a ment with different potentials. phase-to-phase nominal voltage of 5,000 volts or more will be performed only § 75.705–5 Installation of protective with the use of live line tools; equipment. (4) Weather conditions will not inter- Before repair work on energized high- fere with such repairs or expose those voltage surface lines is begun, protec- persons assigned to such work to an tive equipment shall be used to cover imminent danger; and all bare conductors, ground wires, (b) The operator has designated a guys, telephone lines, and other at- person qualified under the provisions of tachments in proximity to the area of § 75.154 as the person responsible for planned repairs. Such protective equip- carrying out such repairs and such per- ment shall be installed from a safe po- son, in order to ensure protection for sition below the conductors or other himself and other qualified persons as- apparatus being covered. Each rubber signed to perform such repairs from the protective device employed in the mak- hazards of such repair, has prepared ing of repairs shall have a dielectric and filed with the operator: strength of 20,000 volts, or more. (1) A general description of the nature and location of the damage or de- § 75.705–6 Protective clothing; use and fect to be repaired; inspection. (2) The general plan to be followed in All persons performing work on ener- making such repairs; gized high-voltage surface lines shall (3) A statement that a briefing of all wear protective rubber gloves, sleeves, qualified persons assigned to make and climber guards if climbers are such repairs was conducted informing worn. Protective rubber gloves shall them of the general plan, their indi- not be worn wrong side out or without vidual assignments, and the dangers in- protective leather gloves. Protective herent in such assignments; devices worn by a person assigned to (4) A list of the proper protective perform repairs on high-voltage surface equipment and clothing that will be lines shall be worn continuously from provided; and the time he leaves the ground until he

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returns to the ground, and, if such de- § 75.705–10 Tying into energized high- vices are employed for extended peri- voltage surface circuits. ods, such person shall visually inspect If the work of forming an additional the equipment assigned him for defects circuit by tying into an energized high- before each use and, in no case, less voltage surface line is performed from than twice each day. the ground, any person performing such work must wear and employ all of § 75.705–7 Protective equipment; in- the protective equipment and clothing spection. required under the provisions of Each person shall visually inspect §§ 75.705–5 and 75.705–6. In addition, the protective equipment and clothing pro- insulated stick used by such person vided him in connection with work on must have been designed for such pur- high-voltage surface lines before using pose and must be adequately insulated such equipment and clothing, and any and be maintained to protect such per- equipment or clothing containing any son from the voltage to which he is ex- defect or damage shall be discarded and posed. replaced with proper protective equipment or clothing prior to the perform- § 75.705–11 Use of grounded messenger ance of any electrical work on such wires; ungrounded systems. lines. Solely for purposes of grounding ungrounded high-voltage power sys- § 75.705–8 Protective equipment; test- tems, grounded messenger wires used ing and storage. to suspend the cables of such systems (a) All rubber protective equipment may be used as a grounding medium. used on work on energized high-voltage § 75.706 Deenergized underground surface lines shall be electrically test- power circuits; idle days—idle ed by the operator in accordance with shifts. ASTM standards, Part 28, published February 1968, and such testing shall be [STATUTORY PROVISIONS] conducted in accordance with the fol- When not in use, power circuits un- lowing schedule: derground shall be deenergized on idle (1) Rubber gloves, once each month; days and idle shifts, except that recti- (2) Rubber sleeves, once every 3 fiers and transformers may remain en- months; ergized. (3) Rubber blankets, once every 6 months; Subpart I—Underground High- (4) Insulator hoods and line hose, Voltage Distribution once a year; and (5) Other electric protective equip- § 75.800 High-voltage circuits; circuit ment, once a year. breakers. (b) Rubber gloves shall not be stored wrong side out. Blankets shall be rolled [STATUTORY PROVISIONS] when not in use, and line hose and in- High-voltage circuits entering the sulator hoods shall be stored in their underground area of any coal mine natural position and shape. shall be protected by suitable circuit breakers of adequate interrupting ca- § 75.705–9 Operating disconnecting or pacity which are properly tested and cutout switches. maintained as prescribed by the Sec- Disconnecting or cutout switches on retary. Such breakers shall be equipped energized high-voltage surface lines with devices to provide protection shall be operated only with insulated against under-voltage grounded phase, sticks, fuse tongs, or pullers which are short circuit, and overcurrent. adequately insulated and maintained to protect the operator from the volt- § 75.800–1 Circuit breakers; location. age to which he is exposed. When such Circuit breakers protecting high- switches are operated from the ground, voltage circuits entering an under- the person operating such devices shall ground area of any coal mine shall be wear protective rubber gloves. located on the surface and in no case

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installed either underground or within to be secure and not susceptible to al- a drift. teration. (c) Retention and access. These records § 75.800–2 Approved circuit schemes. shall be retained at a surface location The following circuit schemes will be at the mine for at least one year and regarded as providing the necessary shall be made available to authorized protection to the circuits required by representatives of the Secretary, the § 75.800: representative of miners, and other in- (a) Ground check relays may be used terested persons. for undervoltage protection if the relay [64 FR 43287, Aug. 10, 1999] coils are designed to trip the circuit breaker when line voltage decreases to § 75.801 Grounding resistors. 40 percent to 60 percent of the nominal line voltage; [STATUTORY PROVISIONS] (b) Ground trip relays on resistance grounded systems will be acceptable as The grounding resistor, where re- grounded phase protection; quired, shall be of the proper ohmic (c) One circuit breaker may be used value to limit the voltage drop in the to protect two or more branch circuits, grounding circuit external to the resis- if the circuit breaker is adjusted to af- tor to not more than 100 volts under ford overcurrent protection for the fault conditions. The grounding resis- smallest conductor. tor shall be rated for maximum fault current continuously and insulated § 75.800–3 Testing, examination and from ground for a voltage equal to the maintenance of circuit breakers; phase-to-phase voltage of the system. procedures. (a) Circuit breakers and their auxil- § 75.802 Protection of high-voltage circuits extending underground. iary devices protecting underground high-voltage circuits shall be tested (a) Except as provided in paragraph and examined at least once each month (b) of this section, high-voltage cir- by a person qualified as provided in cuits extending underground and sup- § 75.153; plying portable, mobile, or, stationary (b) Tests shall include: (1) Breaking high-voltage equipment shall contain continuity of the ground check con- either a direct or derived neutral which ductor, where ground check monitoring shall be grounded through a suitable is used; and resistor at the source transformers, (2) Actuating at least two (2) of the and a grounding circuit, originating at auxiliary protective relays. the grounded side of the grounding re- (c) Examination shall include visual sistor, shall extend along with the observation of all components of the power conductors and serve as a circuit breaker and its auxiliary de- grounding conductor for the frames of vices, and such repairs or adjustments all high-voltage equipment supplied as are indicated by such tests and ex- power from that circuit. aminations shall be carried out imme- (b) Notwithstanding the require- diately. ments of paragraph (a) of this section, the Secretary or his authorized rep- § 75.800–4 Testing, examination, and resentative may permit ungrounded maintenance of circuit breakers; high-voltage circuits to be extended record. underground to feed stationary electric (a) Recordkeeping. The operator shall equipment if: make a record of each test, examina- (1) Such circuits are either steel ar- tion, repair, or adjustment of all cir- mored or installed in grounded, rigid cuit breakers protecting high-voltage steel conduit throughout their entire circuits which enter any underground length; or, area of the mine. (2) The voltage of such circuits is (b) Record security. These records nominally 2,400 volts or less phase-to- shall be made in a secure book that is phase and the cables used in such cir- not susceptible to alteration or elec- cuits are equipped with metallic tronically in a computer system so as shields around each power conductor,

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and contain one or more ground con- § 75.803–2 Ground check systems not ductors having a total cross sectional employing pilot check wires; ap- area of not less than one-half the power proval by the Secretary. conductor; and, Ground check systems not employing (3) Upon a finding by the Secretary pilot check wires will be approved only or his authorized representative that if it is determined that the system in- the use of the circuits described in cludes a fail safe design causing the paragraphs (b) (1) and (2) of this section circuit breaker to open when ground does not pose a hazard to the miners. continuity is broken. (c) Within 100 feet of the point on the surface where high-voltage circuits § 75.804 Underground high-voltage ca- enter the underground portion of the bles. mine, disconnecting devices shall be in- (a) Underground high-voltage cables stalled and so equipped or designed in used in resistance grounded systems such a manner that it can be deter- shall be equipped with metallic shields mined by visual observation that the around each power conductor with one power is disconnected, except that the or more ground conductors having a Secretary or his authorized representa- total cross sectional area of not less tive may permit such devices to be in- than one-half the power conductor, and stalled at a greater distance from such with an insulated external conductor area of the mine if he determines, not smaller than No. 8 (A.W.G.) or an based on existing physical conditions, insulated internal ground check con- that such installation will be more ac- ductor not smaller than No. 10 (A.W.G.) cessible at a greater distance and will for the ground continuity check cir- not pose any hazard to the miners. cuit. [38 FR 4975, Feb. 23, 1973] (b) All such cables shall be adequate for the intended current and voltage. § 75.803 Fail safe ground check cir- Splices made in such cables shall pro- cuits on high-voltage resistance vide continuity of all components. grounded systems. [38 FR 4976, Feb. 23, 1973] [STATUTORY PROVISIONS] § 75.805 Couplers. On and after September 30, 1970, high- voltage, resistance grounded systems [STATUTORY PROVISIONS] shall include a fail safe ground check Couplers that are used with medium- circuit to monitor continuously the voltage or high-voltage power circuits grounding circuit to assure continuity shall be of the three-phase type with a and the fail safe ground check circuit full metallic shell, except that the Sec- shall cause the circuit breaker to open retary may permit, under such guide- when either the ground or pilot check lines as he may prescribe, no less effec- wire is broken, or other no less effective couplers constructed of materials tive device approved by the Secretary other than metal. Couplers shall be or his authorized representative to as- adequate for the voltage and current sure such continuity, except that an expected. All exposed metal on the me- extension of time, not in excess of 12 tallic couplers shall be grounded to the months, may be permitted by the Sec- ground conductor in the cable. The retary on a mine-by-mine basis if he coupler shall be constructed so that determines that such equipment is not the ground check continuity conductor available. shall be broken first and the ground § 75.803–1 Maximum voltage ground conductors shall be broken last when check circuits. the coupler is being uncoupled. The maximum voltage used for ground check circuits under § 75.803 shall not exceed 96 volts.

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§ 75.806 Connection of single-phase § 75.811 High-voltage underground loads. equipment; grounding.

[STATUTORY PROVISIONS] [STATUTORY PROVISIONS] Single-phase loads, such as trans- Frames, supporting structures and former primaries, shall be connected enclosures of stationary, portable, or phase-to-phase. mobile underground high-voltage equipment and all high-voltage equip- § 75.807 Installation of high-voltage ment supplying power to such equip- transmission cables. ment receiving power from resistance grounded systems shall be effectively [STATUTORY PROVISIONS] grounded to the high-voltage ground. All underground high-voltage transmission cables shall be installed only § 75.812 Movement of high-voltage in regularly inspected air courses and power centers and portable trans- haulageways, and shall be covered, bur- formers; permit. ied, or placed so as to afford protection [STATUTORY PROVISIONS] against damage, guarded where men regularly work or pass under them un- Power centers and portable trans- less they are 61⁄2 feet or more above the formers shall be deenergized before floor or rail, securely anchored, prop- they are moved from one location to erly insulated, and guarded at ends, another, except that, when equipment and covered, insulated, or placed to powered by sources other than such prevent contact with trolley wires and centers or transformers is not avail- other low-voltage circuits. able, the Secretary may permit such centers and transformers to be moved § 75.808 Disconnecting devices. while energized, if he determines that another equivalent or greater hazard [STATUTORY PROVISIONS] may otherwise be created, and if they Disconnecting devices shall be in- are moved under the supervision of a stalled at the beginning of branch lines qualified person, and if such centers in high-voltage circuits and equipped and transformers are examined prior to or designed in such a manner that it such movement by such person and can be determined by visual observa- found to be grounded by methods ap- tion that the circuit is deenergized proved by an authorized representative when the switches are open. of the Secretary and otherwise protected from hazards to the miner. A § 75.809 Identification of circuit break- record shall be kept of such examina- ers and disconnecting switches. tions. High-voltage cables, other than trailing cables, shall not be moved or [STATUTORY PROVISIONS] handled at any time while energized, except that, when such centers and Circuit breakers and disconnecting transformers are moved while ener- switches underground shall be marked gized as permitted under this section, for identification. energized high-voltage cables attached § 75.810 High-voltage trailing cables; to such centers and transformers may splices. be moved only by a qualified person and the operator of such mine shall re- [STATUTORY PROVISIONS] quire that such person wear approved and tested insulated wireman’s gloves. In the case of high-voltage cables used as trailing cables, temporary [35 FR 17890, Nov. 20, 1970, as amended at 60 splices shall not be used and all perma- FR 33723, June 29, 1995] nent splices shall be made in accordance with § 75.604. Terminations and § 75.812–1 Qualified person. splices in all other high-voltage cables A person who meets the requirements shall be made in accordance with the of § 75.153 is a qualified person within manufacturer’s specifications. the meaning of § 75.812.

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§ 75.812–2 High-voltage power centers (4) High-voltage circuits extending and transformers; record of exam- from the section power center must be ination. provided with— The operator shall maintain a record (i) Ground-fault protection set to of all examinations conducted in ac- cause deenergization at not more than cordance with § 75.812. Such record 40 percent of the current rating of the shall be kept in a book approved by the neutral grounding resistor; Secretary. (ii) A backup ground-fault detection device to cause deenergization when a HIGH-VOLTAGE LONGWALLS ground fault occurs with the neutral grounding resistor open; and SOURCE: 67 FR 11001, Mar. 11, 2002, unless (iii) Thermal protection for the otherwise noted. grounding resistor that will deenergize the longwall power center if the resis- § 75.813 High-voltage longwalls; scope. tor is subjected to a sustained ground Sections 75.814 through 75.822 of this fault. The thermal protection must op- part are electrical safety standards erate at either 50 percent of the max- that apply to high-voltage longwall cir- imum temperature rise of the ground- cuits and equipment. All other existing ing resistor, or 150 °C (302 °F), which- standards in 30 CFR must also apply to ever is less, and must open the ground- these longwall circuits and equipment wire monitor circuit for the high-volt- where appropriate. age circuit supplying the section power center. The thermal protection must § 75.814 Electrical protection. not be dependent upon control power and may consist of a current trans- (a) High-voltage circuits must be pro- former and overcurrent relay. tected against short circuits, over- (5) High-voltage motor and shearer loads, ground faults, and undervoltages circuits must be provided with instan- by circuit-interrupting devices of ade- taneous ground-fault protection set at quate interrupting capacity as follows: not more than 0.125-ampere. (1) Current settings of short-circuit (6) Time-delay settings of ground- protective devices must not exceed the fault protective devices used to provide setting specified in approval docu- coordination with the instantaneous mentation, or seventy-five percent of ground-fault protection of motor and the minimum available phase-to-phase shearer circuits must not exceed 0.25- short-circuit current, whichever is less. second. (2) Time-delay settings of short-cir- (7) Undervoltage protection must be cuit protective devices used to protect provided by a device which operates on any cable extending from the section loss of voltage to cause and maintain power center to a motor-starter enclo- the interruption of power to a circuit sure must not exceed the settings spec- to prevent automatic restarting of the ified in approval documentation, or equipment. 0.25-second, whichever is less. Time (b) Current transformers used for the delay settings of short-circuit protec- ground-fault protection specified in tive devices used to protect motor and paragraphs (a)(4)(i) and (5) of this sec- shearer circuits must not exceed the tion must be single window-type and settings specified in approval docu- must be installed to encircle all three mentation, or 3 cycles, whichever is phase conductors. Equipment safety less. grounding conductors must not pass (3) Ground-fault currents must be through or be connected in series with limited by a neutral grounding resistor ground-fault current transformers. to not more than— (c) Each ground-fault current device (i) 6.5 amperes when the nominal specified in paragraphs (a)(4)(i) and (5) voltage of the power circuit is 2,400 of this section must be provided with a volts or less; or test circuit that will inject a primary (ii) 3.75 amperes when the nominal current of 50 percent or less of the cur- voltage of the power circuit exceeds rent rating of the grounding resistor 2,400 volts. through the current transformer and

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cause each corresponding circuit-inter- of the circuit that is supplied power rupting device to open. through the device. (d) Circuit-interrupting devices must (d) Each disconnecting device must not reclose automatically. be designed and installed so that— (e) Where two or more high-voltage (1) Visual observation determines cables are used to supply power to a that the contacts are open without re- common bus in a high-voltage enclo- moving any cover; sure, each cable must be provided with (2) All load power conductors can be ground-wire monitoring. The ground- grounded when the device is in the wire monitoring circuits must cause ‘‘open’’ position; and deenergization of each cable when ei- (3) The device can be locked in the ther the ground-monitor or grounding ‘‘open’’ position. conductor(s) of any cable become sev- (e) Disconnecting devices, except ered or open. On or after May 10, 2002, those installed in explosion-proof en- parallel connected cables on newly in- closures, must be capable of inter- stalled longwalls must be protected as rupting the full-load current of the cir- follows: cuit or designed and installed to cause the current to be interrupted auto- (1) When one circuit-interrupting de- matically prior to the opening of the vice is used to protect parallel con- contacts of the device. Disconnecting nected cables, the circuit-interrupting devices installed in explosion-proof en- device must be electrically interlocked closures must be maintained in accord- with the cables so that the device will ance with the approval requirements of open when any cable is disconnected; paragraph (f)(2)(iv) of § 18.53 of part 18 or of this chapter. (2) When two or more parallel circuit- interrupting devices are used to pro- § 75.816 Guarding of cables. tect parallel connected cables, the cir- (a) High-voltage cables must be cuit-interrupting devices must be me- guarded at the following locations: chanically and electrically interlocked. (1) Where persons regularly work or Mechanical interlocking must cause all travel over or under the cables. devices to open simultaneously and (2) Where the cables leave cable han- electrical interlocking must cause all dling or support systems to extend to devices to open when any cable is dis- electric components. connected. (b) Guarding must minimize the possibility of miners contacting the cables § 75.815 Disconnect devices. and protect the cables from damage. (a) The section power center must be The guarding must be made of ground- equipped with a main disconnecting de- ed metal or nonconductive flame-re- vice installed to deenergize all cables sistant material. extending to longwall equipment when the device is in the ‘‘open’’ position. § 75.817 Cable handling and support See Figures I-1 and I-2 in Appendix A systems. to this subpart I. Longwall mining equipment must be (b) Disconnecting devices for motor- provided with cable-handling and sup- starter enclosures must be maintained port systems that are constructed, in- in accordance with the approval re- stalled and maintained to minimize the quirements of paragraph (f) of § 18.53 of possibility of miners contacting the ca- part 18 of this chapter. The compart- bles and to protect the high-voltage ca- ment for the disconnect device must be bles from damage. provided with a caution label to warn miners against entering the compart- § 75.818 Use of insulated cable han- ment before deenergizing the incoming dling equipment. high-voltage circuits to the compart- (a) Energized high-voltage cables ment. must not be handled except when (c) Disconnecting devices must be motor or shearer cables need to be rated for the maximum phase-to-phase trained. When cables need to be voltage of the circuit in which they are trained, high-voltage insulated gloves, installed, and for the full-load current mitts, hooks, tongs, slings, aprons, or

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other personal protective equipment § 75.820 Electrical work; trouble- capable of providing protection against shooting and testing. shock hazard must be used to prevent (a) Electrical work on all circuits and direct contact with the cable. equipment associated with high-volt- (b) High-voltage insulated gloves, age longwalls must be performed only sleeves, and other insulated personal by persons qualified under § 75.153 to protective equipment must— perform electrical work on all circuits (1) Have a voltage rating of at least and equipment. Class 1 (7,500 volts) that meets or ex- (b) Prior to performing electrical ceeds ASTM F496–97, ‘‘Standard Speci- work, except for troubleshooting and fication for In-Service Care of Insu- testing of energized circuits and equip- lating Gloves and Sleeves’’ (1997). (2) Be examined before each use for ment as provided for in paragraph (d) visible signs of damage; of this section, a qualified person must (3) Be removed from the underground do the following: area of the mine or destroyed when (1) Deenergize the circuit or equip- damaged or defective; and ment with a circuit-interrupting de- (4) Be electrically tested every 6 vice. months in accordance with publication (2) Open the circuit disconnecting de- ASTM F496–97. ASTM F496–97 (Stand- vice. On high-voltage circuits, ground ard Specification for In-Service Care of the power conductors until work on the Insulating Gloves and Sleeves, 1997) is circuit is completed. incorporated by reference and may be (3) Lock out the disconnecting device inspected at any MSHA Coal Mine with a padlock. When more than one Safety and Health District Office, or at qualified person is performing work, MSHA’s Office of Standards, Regula- each person must install an individual tions, and Variances, 201 12th Street padlock. South, Arlington, VA 22202–5452; 202– (4) Tag the disconnecting device to 693–9440; and at the National Archives identify each person working and the and Records Administration (NARA). circuit or equipment on which work is For information on the availability of being performed. this material at NARA, call 202–741– (c) Each padlock and tag must be re- 6030, or go to: http://www.archives.gov/ moved only by the person who installed federallregister/ them, except that, if that person is un- codeloflfederallregulations/ available at the mine, the lock and tag ibrllocations.html. In addition, copies may be removed by a person authorized of the document can be purchased from by the operator, provided— the American Society for Testing and (1) The authorized person is qualified Materials, 100 Barr Harbor Drive, P.O. under paragraph (a) of this section; and Box C700, West Conshohocken, PA (2) The operator ensures that the per- 19428–2959; 610–832–9500; http:// son who installed the lock and tag is www.astm.org. This incorporation by aware of the removal before that per- reference was approved by the Director son resumes work on the affected cir- of the Federal Register in accordance cuit or equipment. with 5 U.S.C. 552(a) and 1 CFR part 51. (d) Troubleshooting and testing of [67 FR 11001, Mar. 11, 2002, as amended at 67 energized circuits must be performed FR 38386, June 4, 2002; 71 FR 16668, Apr. 3, only— 2006; 80 FR 52992, Sept. 2, 2015] (1) On low- and medium-voltage circuits; § 75.819 Motor-starter enclosures; bar- (2) When the purpose of trouble- riers and interlocks. shooting and testing is to determine Compartment separation and cover voltages and currents; and interlock switches for motor-starter (3) By persons qualified to perform enclosures must be maintained in ac- electrical work and who wear protec- cordance with the approval require- tive gloves on circuits that exceed 40 ments of paragraphs (a) and (b) of volts in accordance with the following § 18.53 of part 18 of this chapter. table:

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Circuit voltage Type of glove required

Greater than 120 volts (nominal) (not intrinsically safe) ...... Rubber insulating gloves with leather protectors. 40 volts to 120 volts (nominal) (both intrinsically safe and non-intrinsi- Either rubber insulating gloves with leather protectors cally safe). or dry work gloves. Greater than 120 volts (nominal) (intrinsically safe) ...... Either rubber insulating gloves with leather protectors or dry work gloves.

(4) Rubber insulating gloves must be (c) When examinations or tests of rated at least for the nominal voltage equipment reveal a fire, electrical of the circuit when the voltage of the shock, ignition, or operational hazard, circuit exceeds 120 volts nominal and is the equipment must be removed from not intrinsically safe. service immediately or repaired imme- (e) Before troubleshooting and test- diately. ing a low- or medium-voltage circuit (d) At the completion of examina- contained in a compartment with a tions and tests required by this sec- high-voltage circuit, the high-voltage tion, the person who makes the exami- circuit must be deenergized, discon- nations and tests must certify by sig- nected, grounded, locked out and nature and date that they have been tagged in accordance with paragraph conducted. A record must be made of (b) of this section. any unsafe condition found and any (f) Prior to the installation or re- corrective action taken. Certifications moval of conveyor belt structure, high- and records must be kept for at least voltage cables extending from the sec- one year and must be made available tion power center to longwall equip- for inspection by authorized represent- ment and located in the belt entries atives of the Secretary and representa- must be: tives of miners. (1) Deenergized; or (2) Guarded in accordance with § 75.822 Underground high-voltage § 75.816 of this part, at the location longwall cables. where the belt structure is being in- In addition to the high-voltage cable stalled or removed; or design specifications in § 75.804 of this (3) Located at least 6.5 feet above the part, high-voltage cables for use on mine floor. longwalls may be a type SHD cable with a center ground-check conductor § 75.821 Testing, examination and no smaller than a No. 16 AWG stranded maintenance. conductor. The cables must be MSHA (a) At least once every 7 days, a per- accepted as flame-resistant under part son qualified in accordance with § 75.153 18 or approved under subpart K of part to perform electrical work on all cir- 7. cuits and equipment must test and examine each unit of high-voltage § 75.823 Scope. longwall equipment and circuits to de- Sections 75.823 through 75.834 of this termine that electrical protection, part are electrical safety standards ap- equipment grounding, permissibility, plicable to 2,400 volt continuous mining cable insulation, and control devices machines and circuits. A ‘‘qualified are being properly maintained to pre- person’’ as used in these sections vent fire, electrical shock, ignition, or means a person meeting the require- operational hazards from existing on ments of § 75.153. Other standards in 30 the equipment. Tests must include ac- CFR apply to these circuits and equip- tivating the ground-fault test circuit ment where appropriate. as required by § 75.814(c). (b) Each ground-wire monitor and as- [75 FR 17549, Apr. 6, 2010] sociated circuits must be examined and tested at least once each 30 days to § 75.824 Electrical protection. verify proper operation and that it will (a) Trailing cable protection. The trail- cause the corresponding circuit-inter- ing cable extending to the high-voltage rupting device to open. continuous mining machine must be

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protected by a circuit-interrupting de- (vii) A test circuit for the ground- vice of adequate interrupting capacity fault device must be provided. The test and voltage that provides short-circuit, circuit must inject no more than 50 overload, ground-fault, and under-volt- percent of the current rating of the age protection as follows: neutral grounding resistor through the (1) Short-circuit protection. current transformer. When the test cir- (i) The current setting of the device cuit is activated, the circuit-inter- must be the setting specified in the ap- rupting device must open. proval documentation or 75 percent of (3) Under-voltage protection. The the minimum available phase-to-phase under-voltage device must operate on a short-circuit current, whichever is less; loss of voltage, de-energize the circuit, and and prevent the equipment from auto- (ii) The time-delay setting must not matically restarting. exceed 0.050 seconds. (b) Re-closing. Circuit-interrupting (2) Ground-fault protection. devices must not re-close automati- (i) Neutral grounding resistors must cally. limit the ground-fault current to no (c) Onboard Power Circuits. When a more than 0.5 ampere. grounded-phase indicator light circuit (ii) Ground-fault devices must cause is used and it indicates a grounded- de-energization of the circuit extend- phase fault, the following corrective ing to the continuous mining machine actions must be taken: at not more than 0.125 ampere. The (1) The machine must be moved im- time-delay of the device must not ex- mediately to a location with a properly ceed 0.050 seconds. supported roof; and (iii) Look-ahead circuits must detect (2) The grounded-phase condition a ground-fault condition and prevent must be located and corrected prior to the circuit-interrupting device from placing the continuous mining machine closing as long as the ground-fault con- back into operation. dition exists. (iv) Backup ground-fault devices [75 FR 17549, Apr. 6, 2010] must cause de-energization of the cir- § 75.825 Power centers. cuit extending to the continuous mining machine at not more than 40 per- (a) Main disconnecting switch. The cent of the voltage developed across power center supplying high voltage the neutral grounding resistor when a power to the continuous mining ma- ground fault occurs with the neutral chine must be equipped with a main grounding resistor open. The time- disconnecting switch that, when in the delay setting of the backup device open position, de-energizes input to all must not exceed 0.25 seconds. power transformers. (v) Thermal devices must detect a (b) Trailing cable disconnecting device. sustained ground-fault current in the In addition to the main disconnecting neutral grounding resistor and must switch required in paragraph (a) of this de-energize the incoming power. The section, the power center must be device must operate at either 50 per- equipped with a disconnecting device cent of the maximum temperature rise for each circuit that supplies power to of the neutral grounding resistor or 302 a high-voltage continuous mining ma- °F (150 °C), whichever is less. Thermal chine. A disconnecting device is de- protection must not be dependent on fined as a disconnecting switch or a control power and may consist of a cur- cable coupler. rent transformer and over-current (c) Disconnecting switches. Each dis- relay in the neutral grounding resistor connecting switch must be labeled to circuit. clearly identify the circuit it dis- (vi) A single window-type current connects, and be designed and installed transformer that encircles all three- as follows: phase conductors must be used to acti- (1) Rated for the maximum phase-to- vate the ground-fault device protecting phase voltage of the circuit; the continuous mining machine. Equip- (2) Rated for the full-load current of ment grounding conductors must not the circuit that is supplied power pass through the current transformer. through the device.

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(3) Allow for visual observation, stick. The grounding stick must be without removing any covers, to verify stored in a dry location. that the contacts are open; (i) Caution label. All compartments (4) Ground all power conductors on providing access to energized high- the load side when the switch is in the voltage conductors and parts must dis- ‘‘open and grounded’’ position; play a caution label to warn miners (5) Can only be locked out in the against entering the compartments be- ‘‘open and grounded’’ position; and fore de-energizing incoming high-volt- (6) Safely interrupts the full-load age circuits. current of the circuit or causes the cur- [75 FR 17549, Apr. 6, 2010] rent to be interrupted automatically before the disconnecting switch opens. § 75.826 High-voltage trailing cables. (d) Barriers and covers. All compart- High-voltage trailing cables must: ments that provide access to high-volt- (a) Meet existing trailing cable re- age circuits must have barriers and/or quirements and the approval require- covers to prevent miners from con- ments of the high-voltage continuous tacting energized high-voltage circuits. mining machine; and (e) Main disconnecting switch and con- (b) Meet existing ground-check control circuit interlocking. The control cir- ductor requirements (§ 75.804) or have a cuit must be interlocked with the main stranded center ground-check con- disconnecting switch in the power cen- ductor not smaller than a No. 16 ter so that: A.W.G. (1) When the main disconnecting switch is in the ‘‘open’’ position, the [75 FR 17549, Apr. 6, 2010] control circuit can only be powered through an auxiliary switch in the § 75.827 Guarding of trailing cables. ‘‘test’’ position; and (a) Guarding. (1) The high-voltage (2) When the main disconnecting cable must be guarded in the following switch is in the ‘‘closed’’ position, the locations: control circuit can only be powered (i) From the power center cable cou- through an auxiliary switch in the pler for a distance of 10 feet inby the ‘‘normal’’ position. power center; (f) Interlocks. Each cover or remov- (ii) From the entrance gland for a able barrier providing access to high- distance of 10 feet outby the last strain voltage circuits must be equipped with clamp on the continuous mining ma- at least two interlock switches. Except chine; and, when the auxiliary switch is on the (iii) At any location where the cable ‘‘test’’ position, removal of any cover could be damaged by moving equip- or barrier that exposes energized high- ment. voltage circuits must cause the inter- (2) Guarding must be constructed lock switches to automatically de-en- using nonconductive flame-resistant ergize the incoming circuit to the material or grounded metal. power center. (b) Suspended cables and cable cross- (g) Emergency stop switch. The power overs. When equipment must cross any center must be equipped with an exter- portion of the cable, the cable must be nally accessible emergency stop switch either: hard-wired into the incoming ground- (1) Suspended from the mine roof; or wire monitor circuit that de-energizes the incoming high-voltage in the event (2) Protected by a cable crossover of an emergency. having the following specifications: (h) Grounding stick. The power center (i) A minimum length of 33 inches; must be equipped with a grounding (ii) A minimum width of 17 inches; stick to be used prior to performing (iii) A minimum height of 3 inches; electrical work to assure that high- (iv) A minimum cable placement area voltage capacitors are discharged and of two and one half-inches (21⁄2″) high circuits are de-energized. The power by four and one-quarter inches (41⁄4″) center must have a label readily identi- wide; fying the location of the grounding (v) Made of nonconductive material;

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(vi) Made of material with a distinc- the continuous mining machine. This tive color. The color black must not be provision applies only when using the used; and power sources specified in paragraphs (vii) Made of material that has a (c)(2) and (c)(3) of this section. minimum compressive strength of 6,400 (b) Testing prior to tramming. Prior to pounds per square inch (psi). tramming the continuous mining ma- [75 FR 17549, Apr. 6, 2010] chine, (1) A qualified person must activate § 75.828 Trailing cable pulling. the ground-fault and ground-wire mon- The trailing cable must be de-ener- itor test circuits of the power sources gized prior to being pulled by any specified in paragraph (c) of this sec- equipment other than the continuous tion to assure that the corresponding mining machine. The cable manufac- circuit-interrupting device opens the turer’s recommended pulling proce- circuit. Corrective actions and record- dures must be followed when pulling keeping resulting from these tests the trailing cable with equipment must be in accordance with §§ 75.832(f) other than the continuous mining ma- and (g). chine. (2) Where applicable, a person designated by the mine operator must ac- [75 FR 17549, Apr. 6, 2010] tivate the test circuit for the ground- § 75.829 Tramming continuous mining ed-phase detection circuit on the con- machines in and out of the mine tinuous mining machine to assure that and from section to section. the detection circuit is functioning (a) Conditions of use. Tramming the properly. Corrective actions resulting continuous mining machine in and out from this test must be in accordance of the mine and from section to section with § 75.832(f). must be done in accordance with move- (c) Power sources. In addition to the ment requirements of high-voltage power center specified in § 75.825, the power centers and portable trans- following power sources may be used to formers (§ 75.812) and as follows: tram the continuous mining machine. (1) The power source must not be lo- (1) Medium-voltage power source. A cated in areas where permissible equip- medium-voltage power source is a ment is required; source that supplies 995 volts through a (2) The continuous mining machine trailing cable (See Figure 1 of this sec- must not be used for mining or cutting tion) to the continuous mining ma- purposes, unless a power center is used chine. The medium-voltage power in accordance with §§ 75.823 through source must— 75.828 and §§ 75.830 through 75.833; (i) Not be used to back-feed the high- (3) Low-, medium-, and high-voltage voltage circuits of the continuous min- cables must comply with §§ 75.600–1, ing machine; and 75.907, and 75.826, as applicable; and (ii) Meet all applicable requirements (4) The energized high-voltage cable for medium-voltage circuits in 30 CFR must be mechanically secured onboard 75.

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(2) Step-up transformer. A step-up (2) A sled/cart that must be con- transformer is a transformer that steps nected to the continuous mining ma- up the low or medium voltage to high chine by a tow-bar and be in close prox- voltage (See Figure 2 in this section) imity to the mining machine. and must meet the following require- (B) Grounded as follows: ments: (1) Connected to the incoming ground (i) The trailing cable supplying low conductor of the low- or medium-volt- or medium voltage to the step-up age trailing cable; transformer must meet the applicable (2) Bonded by a No. 1/0 A.W.G. or requirements of 30 CFR part 75; larger external grounding conductor to the continuous mining machine frame; (ii) The high-voltage circuit output and of the step-up transformer supplying (3) Bonded by a No. 1/0 A.W.G. or power to the continuous mining ma- larger external grounding conductor to chine must meet the applicable provi- the metallic shell of each cable cou- sions of § 75.824; pler. (iii) The step-up transformer enclo- (C) Equipped with: sure must be— (1) At least two interlock switches (A) Securely mounted to minimize for each of the enclosure covers; and vibration on: (2) An external emergency stop (1) The continuous mining machine; switch to remove input power to the or step-up transformer.

[75 FR 17549, Apr. 6, 2010] (iv) Using only MSHA-approved high- voltage kits that include instructions § 75.830 Splicing and repair of trailing for outer-jacket repairs and splices. cables. (b) Splicing limitations. (1) Splicing of (a) Splices and repairs. (1) Splicing the high-voltage trailing cable within means the mechanical joining of one or 35 feet of the continuous mining ma- more severed conductors in a single chine is prohibited. length of a cable including the replace- (2) Only four (4) splices will be al- ment of: Insulation, semi-conductive lowed at any one time for the portion tape, metallic shielding, and the outer of the trailing cable that extends from jacket(s). the continuous miner outby for a distance of 300 feet. (2) Repair means to fix damage to any component of the cable other than [75 FR 17549, Apr. 6, 2010] the conductor. § 75.831 Electrical work; trouble- (3) Splices and repairs to high-volt- shooting and testing. age trailing cables must be made: (i) Only by a qualified person trained (a) Trailing cable and continuous mining machine electrical work procedures. in the proper methods of splicing and Prior to performing electrical work, repairing high-voltage trailing cables; other than troubleshooting and test- (ii) In a workman-like manner; ing, on the high-voltage trailing cable (iii) In accordance with § 75.810; and or the continuous mining machine, a

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qualified person must de-energize the (i) Open and ground power conductors power center and follow procedures and lock out and tag the disconnecting specified in paragraph (1) or (2): switch; (1) If a trailing cable disconnecting (ii) Disconnect the plug from the switch is provided: power receptacle; (i) Open and ground the power con- (iii) Lock out and tag the plug; and ductors, lock out and tag the dis- (iv) Place a dust cover over the power connecting switch; and receptacle. (ii) Lock out and tag the plug to the (2) If a trailing cable disconnecting power receptacle. switch is not provided and a cable cou- (2) If a trailing cable disconnecting pler is used as a disconnecting device: switch is not provided and a cable cou- (i) Remove the plug from the power pler is used as a disconnecting device: receptacle and connect it to the grounding receptacle to ground the (i) Remove the plug from the power power conductors; receptacle and connect it to the (ii) Remove the plug from the grounding receptacle; grounding receptacle and install a lock (ii) Lock out and tag the plug to the and tag on the plug; and grounding receptacle; and (iii) Place a dust cover over the (iii) Place a dust cover over the power receptacle. power receptacle. (c) Troubleshooting and testing limita- (b) Troubleshooting and testing the tions. Troubleshooting and testing en- trailing cable. During troubleshooting ergized circuits must be performed and testing, the de-energized high-volt- only: age cable may be disconnected from (1) On low- and medium-voltage cir- the power center only for that period of cuits; time necessary to locate the defective (2) When the purpose of trouble- condition. Prior to troubleshooting and shooting and testing is to determine testing trailing cables, a qualified per- voltages and currents; son must perform the following: (3) By qualified persons; and (1) If a trailing cable disconnecting (4) When using protective gloves in switch is provided: accordance with the following table:

Circuit voltage Type of glove required

Greater than 120 volts (nominal) (not intrinsically safe) ...... Rubber insulating gloves with leather protectors. 40 volts to 120 volts (nominal) (both intrinsically safe and non- Either rubber insulating gloves with leather protectors or dry intrinsically safe). work gloves. Greater than 120 volts (nominal) (intrinsically safe) ...... Either rubber insulating gloves with leather protectors or dry work gloves.

(d) Power center electrical work proce- person is performing electrical work, dures. Before any work is performed in- including troubleshooting and testing, side any compartment of the power each person must install an individual center, except for troubleshooting and lock and tag. Each lock and tag must testing energized circuits as specified be removed only by the persons who in- in paragraph (c) of this section, a quali- stalled them. fied person must: (2) If the person who installed the (1) De-energize affected circuits; lock and tag is unavailable, the lock (2) Open the corresponding dis- and tag may be removed by a person connecting switch, lock it out, and tag authorized by the operator, provided it to assure the circuit is isolated; that: (3) Visually verify that the contacts (i) The authorized person is a quali- of the disconnecting switch are open fied person; and and grounded; and (ii) The mine operator assures that (4) Discharge all high-voltage capaci- the person who installed the lock and tors and circuits. tag is aware that the lock and tag have been removed. (e) Locking out and tagging responsibil- ities. (1) When more than one qualified [75 FR 17549, Apr. 6, 2010]

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§ 75.832 Frequency of examinations; mining machine, a person designated recordkeeping. by the mine operator must activate the (a) Continuous mining machine exam- test circuit at the beginning of each ination. At least once every 7 days, a production shift to assure that the de- qualified person must examine each tection circuit is functioning properly. high-voltage continuous mining ma- (f) Corrective action. When examina- chine to verify that electrical protec- tions or tests of equipment reveal a tion, equipment grounding, permissi- risk of fire, electrical shock, ignition, bility, cable insulation, and control de- or operational hazard, the equipment vices are properly installed and main- must be immediately removed from tained. service or repaired. (b) Ground-fault test circuit. At least (g) Record of tests. (1) At the comple- once every 7 days, and prior to tion of examinations and tests required tramming the high-voltage continuous under paragraphs (a), (b), and (c) of this mining machine, a qualified person section, the person conducting the ex- must activate the ground-fault test cir- aminations and tests must: cuit to verify that it will cause the cor- (i) Certify by signature and date that responding circuit-interrupting device the examinations and tests have been to open. conducted. (c) Ground-wire monitor test. At least (ii) Make a record of any unsafe con- once every 7 days, and prior to dition found. tramming the high-voltage continuous (2) Any corrective action(s) must be mining machine, a qualified person recorded by the person taking the cor- must examine and test each high-volt- rective action. age continuous mining machine (3) The record must be countersigned ground-wire monitor circuit to verify by the mine foreman or equivalent that it will cause the corresponding mine official by the end of the mine circuit-interrupting device to open. foreman’s or the equivalent mine offi- (d) Trailing cable inspections. (1) Once cial’s next regularly scheduled working each day during the shift that the con- shift. tinuous mining machine is first ener- (4) Records must be maintained in a gized, a qualified person must de-ener- secure book that is not susceptible to gize and inspect the entire length of alteration or electronically in a com- the high-voltage trailing cable from puter system so as to be secure and not the power center to the continuous susceptible to alteration. (5) Certifications and records must be mining machine. The inspection must kept for at least 1 year and must be include examination of the outer jack- made available for inspection by au- et repairs and splices for damage, and thorized representatives of the Sec- assure guarding is provided where re- retary and representatives of miners. quired. (2) At the beginning of each shift [75 FR 17549, Apr. 6, 2010] that the continuous mining machine is energized, a person designated by the § 75.833 Handling high-voltage trailing mine operator must de-energize and cables. visually inspect the high-voltage trail- (a) Cable handling. (1) Miners must ing cable for damage to the outer jack- not handle energized trailing cables un- et. This inspection must be conducted less they are wearing high-voltage in- from the continuous mining machine sulating gloves, which include the rub- to the following locations: ber gloves and leather outer protector (i) The last open crosscut; gloves, or are using insulated cable (ii) Within 150 feet of the working handling tools that meet the require- place during retreat or second mining; ments of paragraph (c) or (d) of this or section. (iii) Up to 150 feet from the contin- (2) Miners must not handle energized uous mining machine when the ma- high-voltage cables with any parts of chine is used in outby areas. their bodies except by hand in accord- (e) Grounded-phase detection test. ance with paragraph (1) above. When a grounded-phase test circuit is (b) Availability. Each mine operator provided on a high-voltage continuous must make high-voltage insulating

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gloves or insulated cable handling tools ually examined before each use for available to miners handling energized signs of damage or defects. high-voltage trailing cables. (4) Damaged rubber gloves must be (c) High-voltage insulating gloves. removed from the underground area of High-voltage insulating gloves must the mine or destroyed. Leather protec- meet the following requirements: tors must be maintained in good condi- (1) The rubber gloves must be de- tion or replaced. signed and maintained to have a volt- (d) Insulated cable handling tools. In- age rating of at least Class 1 (7,500 sulated cable handling tools must be: volts) and tested every 30 days in ac- (1) Rated and properly maintained to cordance with publication ASTM F496– withstand at least 7,500 volts; 02a, ‘‘Standard Specification for In- (2) Designed and manufactured for Service Care of Insulating Gloves and cable handling; Sleeves’’ (2002). The Director of the (3) Visually examined before each use Federal Register approved this incorpo- for signs of damage or defects; and (4) Removed from the underground ration by reference in accordance with area of the mine or destroyed if dam- 5 U.S.C. 522(a) and 1 CFR part 51. ASTM aged or defective. F496–02a may be obtained from the American Society for Testing and Ma- [75 FR 17549, Apr. 6, 2010, as amended at 80 terials, 100 Barr Harbor Drive, P.O. Box FR 52992, Sept. 2, 2015] C700, West Conshohocken, PA 19428– 2959, call 610–832–9500 or go to http:// § 75.834 Training. www.astm.org. ASTM F496–02a is avail- In addition to existing part 48 task able for inspection at any MSHA Coal training, hazard training, training for Mine Safety and Health District Office, qualified persons under existing § 75.153, at the MSHA Office of Standards, Reg- and annual refresher training, the fol- ulations, and Variances, 201 12th Street lowing specialized training shall be South, Arlington, VA 22202–5452; 202– provided and specified in the part 48 693–9440; or at the National Archives plan: and Records Administration (NARA). (a) Training for miners who perform For information on the availability of maintenance on high-voltage contin- this material at NARA, call 202–741– uous mining machines in high-voltage 6030, or go to: http://www.archives.gov/ safety, testing, and repair and mainte- federallregister/ nance procedures. codeloflfederallregulations/ (b) Training for personnel who work ibrllocations.html. in the vicinity of high-voltage contin- (2) The rubber glove portion must be uous mining machines in safety proce- air-tested at the beginning of each dures and precautions for moving the shift to assure its effectiveness. high-voltage machines or the trailing (3) Both the leather protector and cables. rubber insulating gloves must be vis- [75 FR 17549, Apr. 6, 2010]

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APPENDIX A TO SUBPART I OF PART 75—DIAGRAMS OF INBY AND OUTBY SWITCHING

[67 FR 11001, Mar. 11, 2002; 67 FR 18823, Apr. 17, 2002]

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Subpart J—Underground Low- and tings listed in the tables of the Na- Medium-Voltage Alternating tional Electric Code, 1968. Current Circuits § 75.900–3 Testing, examination, and maintenance of circuit breakers; § 75.900 Low- and medium-voltage cir- procedures. cuits serving three-phase alternating current equipment; circuit Circuit breakers protecting low- and breakers. medium-voltage alternating current circuits serving three-phase alter- [STATUTORY PROVISIONS] nating current equipment and their auxiliary devices shall be tested and Low- and medium-voltage power cir- examined at least once each month by cuits serving three-phase alternating a person qualified as provided in current equipment shall be protected § 75.153. In performing such tests, actu- by suitable circuit breakers of ade- ating any of the circuit breaker auxil- quate interrupting capacity which are iaries or control circuits in any man- properly tested and maintained as pre- ner which causes the circuit breaker to scribed by the Secretary. Such break- open, shall be considered a proper test. ers shall be equipped with devices to All components of the circuit breaker provide protection against undervolt- and its auxiliary devices shall be vis- age, grounded phase, short circuit, and ually examined and such repairs or ad- overcurrent. justments as are indicated by such § 75.900–1 Circuit breakers; location. tests and examinations shall be carried out immediately. Circuit breakers used to protect low- and medium-voltage circuits under- § 75.900–4 Testing, examination, and ground shall be located in areas which maintenance of circuit breakers; are accessible for inspection, examina- record. tion, and testing, have safe roofs, and The operator of any coal mine shall are clear of any moving equipment maintain a written record of each test, used in haulageways. examination, repair, or adjustment of all circuit breakers protecting low- and § 75.900–2 Approved circuit schemes. medium-voltage circuits serving three- The following circuit schemes will be phase alternating current equipment regarded as providing the necessary used in the mine. Such record shall be protection to the circuit required by kept in a book approved by the Sec- § 75.900: retary. (a) Ground check relays may be used [35 FR 17890, Nov. 20, 1970, as amended at 60 for undervoltage protection if the relay FR 33723, June 29, 1995] coils are designed to trip the circuit breaker when line voltage decreases to § 75.901 Protection of low- and me- 40 to 60 percent of the nominal line dium-voltage three-phase circuits voltage. used underground. (b) One undervoltage device installed [STATUTORY PROVISIONS] in the main secondary circuit at the source transformer may be used to pro- (a) Low- and medium-voltage three- vide undervoltage protection for each phase alternating-current circuits used circuit that receives power from that underground shall contain either a di- transformer. rect or derived neutral which shall be (c) One circuit breaker may be used grounded through a suitable resistor at to protect two or more branch circuits the power center, and a grounding cir- if the circuit breaker is adjusted to af- cuit, originating at the grounded side ford overcurrent protection for the of the grounding resistor, shall extend smallest conductor. along with the power conductors and (d) Circuit breakers with shunt trip, serve as a grounding conductor for the series trip or undervoltage release de- frames of all the electrical equipment vices may be used if the tripping ele- supplied power from that circuit, ex- ments of such devices are selected or cept that the Secretary or his author- adjusted in accordance with the set- ized representative may permit

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ungrounded low- and medium-voltage (4) Each three-phase output circuit circuits to be used underground to feed that supplies power to equipment must such stationary electrical equipment if be equipped with an instantaneous sen- such circuits are either steel armored sitive ground-fault relay that will or installed in grounded rigid steel con- cause its respective circuit inter- duit throughout their entire length. rupting device(s) to trip and cause The grounding resistor, where required, shutdown of the diesel engine when a shall be of the proper ohmic value to phase-to-frame fault occurs. The limit the ground fault current to 25 grounded-phase protection must be set amperes. The grounding resistor shall at not more than 90 milliamps. Current be rated for maximum fault current transformers used for the ground-fault continuously and insulated from protection must be single window-type ground for a voltage equal to the and must be installed to encircle all phase-to-phase voltage of the system. three phase conductors. Equipment (b) Diesel-powered electrical genera- safety grounding conductors must not tors used as an alternative to power pass through or be connected in series centers for the purpose of moving with ground-fault current trans- equipment in, out, and around the formers. mine, and to perform work in areas (5) Each three-phase circuit inter- where permissible equipment is not re- rupting device must be provided with a quired, must comply with the fol- means to provide short-circuit, over- lowing: current, grounded-phase, undervoltage, (1) The diesel engine powering the and ground wire monitoring protec- electrical generator must be approved tion. The instantaneous only trip unit under 30 CFR part 7, subpart E. for the circuit interrupting device(s) in (2) A grounding resistor rated for the use must be adjusted to trip at not phase-to-phase voltage of the system more than 75 percent of the minimum must be provided to limit the ground- available short circuit current at the fault current to not more than 0.5 am- point where the portable cable enters peres. The grounding resistor(s) must the equipment or the maximum allow- be located: able instantaneous settings specified in (i) Between the wye-connected gener- § 75.601–1, whichever is less. ator neutral and the generator frame; (6) The equipment portable cable (see Figure I in Appendix A to subpart length(s) must not exceed the length(s) J of this part) or specified in 30 CFR part 18, appendix I, (ii) Between the wye-connected gen- table 9, Specifications for Cables erator neutral and the generator frame and between the wye-connected trans- Longer than 500 Feet. former secondary and the transformer (7) Permanent label(s) listing the frame when an isolation transformer(s) maximum circuit interrupting device is used and the generator is supplying setting(s) and maximum portable cable power to the other equipment; (see Fig- length(s) must be installed on each in- ure II in Appendix A to subpart J of stantaneous trip unit or be maintained this part) or near each three-phase circuit inter- (iii) Between the wye-connected gen- rupting device. The permanent label(s) erator neutral and the generator frame must be maintained legibly. when an auto-transformer is used. (see (8) The circuit interrupting device Figure III in Appendix A to subpart J that supplies three-phase power cir- of this part) cuit(s) to the equipment being powered (3) Each three-phase output circuit of must be limited to the use of only one the generator must be equipped with a circuit interrupting device at a time sensitive ground fault relay. The pro- when equipment is being moved in, out, tective relay must be set to cause the and around the mine. circuit interrupting device that sup- (9) The grounding system must in- plies power to the primary windings of clude an MSHA-accepted ground wire each transformer to trip and shut down monitor system that satisfies the re- the diesel engine when a phase-to- quirements of § 75.902; or have a No. 1/0 frame fault of not more than 90 or larger external grounding conductor milliamperes occurs. to bond and ground the frames of all

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equipment to the frame of the gener- § 75.902–2 Approved ground check sys- ator. tems not employing pilot check (10) All trailing cables extending wires. from the generator to equipment must Ground check systems not employing comply with § 75.907. pilot check wires will be approved only (11) A strain relief device must be if it is determined that the system in- provided on each end of the trailing ca- cludes a fail safe design causing the bles that extends between the gener- circuit breaker to open when ground ator and the piece of equipment being continuity is broken. powered. (12) Prior to moving each piece of § 75.902–4 Attachment of ground con- equipment or performing work, a func- ductors and ground check wires to tional test of each ground fault and equipment frames; use of separate connections. ground wire monitor system must be performed by a qualified electrician In grounding equipment frames of all who meets the requirements of § 75.153. stationary, portable or mobile equip- The ground-fault circuit must be tested ment receiving power from resistance without subjecting the circuit to an ac- grounded systems separate connections tual grounded phase condition. A shall be used when practicable. record of each test must be maintained and made available to authorized rep- § 75.903 Disconnecting devices. resentatives of the Secretary and to [STATUTORY PROVISIONS] the miners in such mine. Disconnecting devices shall be in- [35 FR 17890, Nov. 20, 1970, as amended at 70 stalled in conjunction with the circuit FR 77736, Dec. 30, 2005] breaker to provide visual evidence that § 75.902 Low- and medium-voltage the power is disconnected. ground check monitor circuits. § 75.904 Identification of circuit breakers. [STATUTORY PROVISIONS] On or before September 30, 1970, low- [STATUTORY PROVISIONS] and medium-voltage resistance ground- Circuit breakers shall be marked for ed systems shall include a fail-safe identification. ground check circuit to monitor continuously the grounding circuit to as- § 75.905 Connection of single-phase sure continuity which ground check loads. circuit shall cause the circuit breaker to open when either the ground or pilot [STATUTORY PROVISIONS] check wire is broken, or other no less Single-phase loads shall be connected effective device approved by the Sec- phase-to-phase. retary or his authorized representative to assure such continuity, except that § 75.906 Trailing cables for mobile an extention of time, not in excess of 12 equipment, ground wires, and months, may be permitted by the Sec- ground check wires. retary on a mine-by-mine basis if he determines that such equipment is not [STATUTORY PROVISIONS] available. Cable couplers shall be con- Trailing cables for mobile equipment structed so that the ground check con- shall contain one or more ground continuity conductor shall be broken first ductors having a cross-sectional area of and the ground conductors shall be bro- not less than one-half the power con- ken last when the coupler is being un- ductor, and, on September 30, 1970, an coupled. insulated conductor for the ground continuity check circuit or other no § 75.902–1 Maximum voltage ground less effective device approved by the check circuits. Secretary or his authorized representa- The maximum voltage used for such tive to assure such continuity, except ground check circuits shall not exceed that an extension of time, not in excess 40 volts. of 12 months may be permitted by the

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Secretary on a mine-by-mine basis if ductors, a ground check conductor, and he determines that such equipment is grounded metallic shields around each not available. Splices made in the ca- power conductor or a ground metallic bles shall provide continuity of all shield over the assembly, except that components. on equipment employing cable reels, cables without shields may be used if § 75.907 Design of trailing cables for medium-voltage circuits. the insulation is rated 2,000 volts or more. [STATUTORY PROVISIONS] Trailing cables for medium-voltage circuits shall include grounding con-

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APPENDIX A TO SUBPART J OF PART 75

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[70 FR 77737, Dec. 30, 2005] fected circuit upon occurrence of a short circuit at any point in the sys- Subpart K—Trolley Wires and tem will meet the requirements of Trolley Feeder Wires § 75.1001. (b) Automatic circuit interrupting § 75.1000 Cutout switches. devices described in paragraph (a) of this section shall be tested and cali- [STATUTORY PROVISIONS] brated at intervals not to exceed six Trolley wires and trolley feeder months. Testing of such devices shall wires, shall be provided with cutout include passing the necessary amount switches at intervals of not more than of electric current through the device 2,000 feet and near the beginning of all to cause activation. Calibration of such branch lines. devices shall include adjustment of all associated relays to ±15 percent of the § 75.1001 Overcurrent protection. indicated value. An authorized representative of the Secretary may re- [STATUTORY PROVISIONS] quire additional testing or calibration of these devices. Trolley wires and trolley feeder wires (c) A record of the tests and calibra- shall be provided with overcurrent pro- tions required by paragraph (b) of this tection. section shall be kept, and shall be § 75.1001–1 Devices for overcurrent made available, upon request, to an au- protection; testing and calibration thorized representative of the Sec- requirements; records. retary. (a) Automatic circuit interrupting [38 FR 29998, Oct. 31, 1973, as amended at 60 devices that will deenergize the af- FR 33723, June 29, 1995]

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§ 75.1002 Installation of electric equip- § 75.1003–1 Other requirements for ment and conductors; permissi- guarding of trolley wires and trol- bility. ley feeder wires. (a) Electric equipment must be per- Adequate precaution shall be taken missible and maintained in a permis- to insure that equipment being moved sible condition when such equipment is along haulageways will not come in located within 150 feet of pillar work- contact with trolley wires or trolley ings or longwall faces. feeder wires. (b) Electric conductors and cables installed in or in by the last open cross- § 75.1003–2 Requirements for move- cut or within 150 feet of pillar workings ment of off-track mining equipment or longwall faces must be— in areas of active workings where energized trolley wires or trolley (1) Shielded high-voltage cables sup- feeder wires are present; pre-move- plying power to permissible longwall ment requirements; certified and equipment; qualified persons. (2) Interconnecting conductors and (a) Prior to moving or transporting cables of permissible longwall equip- any unit of off-track mining equipment ment; in areas of the active workings where (3) Conductors and cables of intrinsi- energized trolley wires or trolley feed- cally safe circuits; and er wires are present: (4) Cables and conductors supplying (1) The unit of equipment shall be ex- power to low- and medium-voltage per- amined by a certified person to ensure missible equipment. that coal dust, float coal dust, loose (5) Shielded high-voltage cables sup- coal oil, grease, and other combustible plying power to permissible continuous materials have been cleaned up and mining machines. have not been permitted to accumulate [67 FR 11004, Mar. 11, 2002, as amended at 75 on such unit of equipment; and, FR 17553, Apr. 6, 2010] (2) A qualified person, as specified in § 75.153 of this part, shall examine the § 75.1003 Insulation of trolley wires, trolley wires, trolley feeder wires, and trolley feeder wires and bare signal the associated automatic circuit inter- wires; guarding of trolley wires and trolley feeder wires. rupting devices provided for short circuit protection to ensure that proper [STATUTORY PROVISIONS] short circuit protection exists. (b) A record shall be kept of the ex- Trolley wires, trolley feeder wires, aminations required by paragraph (a) and bare signal wires shall be insulated of this section, and shall be made avail- adequately where they pass through able, upon request, to an authorized doors and stoppings, and where they representative of the Secretary. cross other power wires and cables. (c) Off-track mining equipment shall Trolley wires and trolley feeder wires be moved or transported in areas of the shall be guarded adequately: active workings where energized trol- (a) At all points where men are re- ley wires or trolley feeder wires are quired to work or pass regularly under present only under the direct super- the wires; vision of a certified person who shall be (b) On both sides of all doors and physically present at all times during stoppings; and moving or transporting operations. (c) At man-trip stations. (d) The frames of off-track mining The Secretary or his authorized rep- equipment being moved or transported, resentatives shall specify other condi- in accordance with this section, shall tions where trolley wires and trolley be covered on the top and on the trol- feeder wires shall be adequately pro- ley wire side with fire-resistant mate- tected to prevent contact by any per- rial which has met the applicable re- son, or shall require the use of im- quirements of Part 18 of Subchapter D proved methods to prevent such con- of this chapter (Bureau of Mines Sched- tact. Temporary guards shall be pro- ule 2G). vided where trackmen and other per- (e) Electrical contact shall be main- sons work in proximity to trolley wires tained between the mine track and the and trolley feeder wires. frames of off-track mining equipment

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being moved in-track and trolley en- or other equivalent two-way commu- tries, except that rubber-tired equip- nication devices that can readily be ment need not be grounded to a trans- connected with the mine communica- porting vehicle if no metal part of such tion system shall be carried by the rubber-tired equipment can come into miner stationed at the first automatic contact with the transporting vehicle. circuit breaker outby the equipment (f) A minimum vertical clearance of being moved and by a miner actually 12 inches shall be maintained between engaged in the moving or transporting the farthest projection of the unit of operation; and, equipment which is being moved and (5) No person shall be permitted to be the energized trolley wires or trolley inby the unit of equipment being feeder wires at all times during the moved or transported, in the ven- movement or transportation of such tilating current of air that is passing equipment; provided, however, that if over such equipment, except those per- the height of the coal seam does not sons directly engaged in moving such permit 12 inches of vertical clearance equipment. to be so maintained, the following ad- (g) The provisions of paragraphs (a) ditional precautions shall be taken: through (f) of this section shall not (1)(i) Except as provided in paragraph apply to units of mining equipment (f)(1)(ii) of this section electric power that are transported in mine cars, pro- shall be supplied to the trolley wires or vided that no part of the equipment ex- trolley feeder wires only from outby tends above or over the sides of the the unit of equipment being moved or mine car. transported. [38 FR 29998, Oct. 31, 1973, as amended at 60 (ii) Where direct current electric FR 33723, June 29, 1995] power is used and such electric power can be supplied only from inby the Subpart L—Fire Protection equipment being moved or transported, power may be supplied from inby such § 75.1100 Requirements. equipment provided a miner with the means to cut off the power, and in di- [STATUTORY PROVISION] rect communication with persons actu- Each coal mine shall be provided ally engaged in the moving or trans- with suitable firefighting equipment porting operation, is stationed outby adapted for the size and conditions of the equipment being moved. the mine. The Secretary shall establish (2) The settings of automatic circuit minimum requirements of the type, interrupting devices used to provide quality, and quantity of such equip- short circuit protection for the trolley ment. circuit shall be reduced to not more than one-half of the maximum current § 75.1100–1 Type and quality of fire- that could flow if the equipment being fighting equipment. moved or transported were to come Firefighting equipment required into contact with the trolley wire or under this subpart shall meet the fol- trolley feeder wire; lowing minimum requirements: (3) At all times the unit of equipment (a) Waterlines: Waterlines shall be is being moved or transported, a miner capable of delivering 50 gallons of shall be stationed at the first auto- water a minute at a nozzle pressure of matic circuit breaker outby the equip- 50 pounds per square inch. ment being moved and such miner shall (b) Portable water cars: A portable be: (i) In direct communication with water car shall be of at least 1,000 gal- persons actually engaged in the moving lons capacity (500 gallons capacity for or transporting operation, and (ii) ca- anthracite mines) and shall have at pable of communicating with the re- least 300 feet of fire hose with nozzles. sponsible person on the surface re- A portable water car shall be capable of quired to be on duty in accordance providing a flow through the hose of 50 with § 75.1600–1 of this part; gallons of water per minute at a nozzle (4) Where trolley phones are utilized pressure of 50 pounds per square inch. to satisfy the requirements of para- (c) A portable chemical car shall graph (f)(3) of this section, telephones carry enough chemicals to provide a

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fire extinguishing capacity equivalent point and be equipped with enough fire to that of a portable water car. hose to reach each working face unless (d) Portable foam-generating ma- the section loading point is provided chines or devices: A portable foam-gen- with one of the following: erating machine or device shall have (i) Two portable water cars; or facilities and equipment for supplying (ii) Two portable chemical cars; or the machine with 30 gallons of water (iii) One portable water car or one per minute at 30 pounds per square portable chemical car, and either (a) a inch for a period of 35 minutes. portable foam-generating machine or (e) Portable fire extinguisher: A port- (b) a portable high-pressure rock-dust- able fire extinguisher shall be either (1) ing machine fitted with at least 250 a multipurpose dry chemical type con- feet of hose and supplied with at least taining a nominal weight of 5 pounds of 60 sacks of rock dust. dry powder and enough expellant to (2) Each working section of coal apply the powder or (2) a foam-pro- mines producing less than 300 tons of 1 ducing type containing at least 2 ⁄2 gal- coal per shift shall be provided with lons of foam-producing liquids and the following: enough expellant to supply the foam. (i) Two portable fire extinguishers; Only fire extinguishers approved by the and Underwriters Laboratories, Inc., or Factory Mutual Research Corp., car- (ii) 240 pounds of rock dust in bags or rying appropriate labels as to type and other suitable containers; and purpose, shall be used. After March 30, (iii) At least 500 gallons of water and 1971, all new portable fire extinguishers at least three pails of 10-quart capac- acquired for use in a coal mine shall ity; or a waterline with sufficient hose have a 2A 10 BC or higher rating. to reach the working places; or a port- (f)(1) Except as provided in paragraph able water car of at least 500-gallons (f)(2) of this section, the fire hose shall capacity; or a portable, all-purpose, be lined with a material having flame dry-powder chemical car of at least 125- resistant qualities meeting require- pounds capacity. ments for hose in Bureau of Mines’ (3) As an alternative to paragraph Schedule 2G. The cover shall be poly- (a)(2) of this section, each working sec- ester, or other material with flame- tion with no electrical equipment at spread qualities and mildew resistance the face of an anthracite coal mine pro- equal or superior to polyester. The ducing less than 300 tons of coal per bursting pressure shall be at least 4 shift shall be provided with the fol- times the water pressure at the valve lowing: to the hose inlet with the valve closed; (i) Portable fire extinguishers con- the maximum water pressure in the taining a total capacity of at least 30 hose nozzle shall not exceed 100 p.s.i.g. pounds of dry chemical or 15 gallons of (2) Fire hose installed for use in un- foam and located at the entrance to derground coal mines prior to Decem- the gangway at the bottom of the ber 30, 1970, shall be mildew-proof and slope; and have a bursting pressure at least 4 (ii) Portable fire extinguishers con- times the water pressure at the valve taining a total capacity of at least 20 to the hose inlet with the valve closed, pounds of dry chemical or 10 gallons of and the maximum water pressure in foam and located within 500 feet from the hose nozzle with water flowing the working face. shall not exceed 100 p.s.i.g. (b) Belt conveyors. In all coal mines, waterlines shall be installed parallel to § 75.1100–2 Quantity and location of the entire length of belt conveyors and firefighting equipment. shall be equipped with firehose outlets (a) Working sections. (1) Each working with valves at 300-foot intervals along section of coal mines producing 300 each belt conveyor and at tailpieces. tons or more per shift shall be provided At least 500 feet of firehose with fit- with two portable fire extinguishers tings suitable for connection with each and 240 pounds of rock dust in bags or belt conveyor waterline system shall other suitable containers; waterlines be stored at strategic locations along shall extend to each section loading the belt conveyor. Waterlines may be

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installed in entries adjacent to the con- shall be one portable fire extinguisher veyor entry belt as long as the outlets or 240 pounds of rock dust within 25 project into the belt conveyor entry. feet of the door on the intake air side. (c) Haulage tracks. (1) In mines pro- (i) Emergency materials. (1) At each ducing 300 tons of coal or more per mine producing 300 tons of coal or more shift waterlines shall be installed par- per shift there shall be readily avail- allel to all haulage tracks using able the following materials at loca- mechanized equipment in the track or tions not exceeding 2 miles from each adjacent entry and shall extend to the working section: loading point of each working section. Waterlines shall be equipped with out- 1,000 board feet of brattice boards let valves at intervals of not more than 2 rolls of brattice cloth 500 feet, and 500 feet of firehose with 2 hand saws fittings suitable for connection with 25 pounds of 8d nails such waterlines shall be provided at 25 pounds of 10d nails strategic locations. Two portable water 25 pounds of 16d nails cars, readily available, may be used in 3 claw hammers lieu of waterlines prescribed under this 25 bags of wood fiber plaster or 10 bags of ce- paragraph. ment (or equivalent material for (2) In mines producing less than 300 stoppings) tons of coal per shift, there shall be 5 tons of rock dust provided at 500-foot intervals in all (2) At each mine producing less than main and secondary haulage roads: 300 tons of coal per shift the above ma- (i) A tank of water of at least 55-gal- terials shall be available at the mine, lon capacity with at least 3 pails of not provided, however, that the emergency less than 10-quart capacity; or materials for one or more mines may (ii) Not less than 240 pounds of be stored at a central warehouse or bagged rock dust. building supply company and such sup- (d) Transportation. Each track or off- ply must be the equivalent of that re- track locomotive, self-propelled man- quired for all mines involved and with- trip car, or personnel carrier shall be in 1-hour’s delivery time from each equipped with one portable fire extinguisher. mine. This exception shall not apply (e) Electrical installations. At each where the active working sections are electrical installation, the operator more than 2 miles from the surface. shall provide two portable fire extin- [35 FR 17890, Nov. 20, 1970, as amended at 73 guishers that have a nominal capacity FR 53127, Sept. 15, 2008] of 5 pounds of dry chemical, or one extinguisher that has a nominal capacity § 75.1100–3 Condition and examination of at least 10 pounds of dry chemical, of firefighting equipment. and which have a 2–A:10–B:C or higher All firefighting equipment shall be rating. maintained in a usable and operative (f) Oil storage stations. Two portable condition. Chemical extinguishers fire extinguishers and 240 pounds of shall be examined every 6 months and rock dust, shall be provided at each the date of the examination shall be permanent underground oil storage station. One portable fire extinguisher written on a permanent tag attached shall be provided at each working sec- to the extinguisher. tion where 25 gallons or more of oil are [35 FR 17890, Nov. 20, 1970, as amended at 60 stored in addition to extinguishers re- FR 33723, June 29, 1995] quired under paragraph (a) of this section. § 75.1101 Deluge-type water sprays, (g) Welding, cutting, soldering. One foam generators; main and sec- portable fire extinguisher or 240 pounds ondary belt-conveyor drives. of rock dust shall be provided at locations where welding, cutting, or sol- [STATUTORY PROVISIONS] dering with arc or flame is being done. Deluge-type water sprays or foam (h) Powerlines. At each wooden door generators automatically actuated by through which powerlines pass there

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rise in temperature, or other no less ef- § 75.1101–5 Installation of foam gener- fective means approved by the Sec- ator systems. retary of controlling fire, shall be in- (a) Foam generator systems shall be stalled at main and secondary belt-con- located so as to discharge foam to the veyor drives. belt drive, belt takeup, electrical controls, gear reducing unit and the con- § 75.1101–1 Deluge-type water spray systems. veyor belt. (b) Foam generator systems shall be (a) Deluge-type spray systems shall equipped with a fire sensor which actu- consist of open nozzles attached to ates the system, and each system shall branch lines. The branch lines shall be be capable of producing and delivering connected to a waterline through a the following amounts of foam within 5 control valve operated by a fire sensor. minutes: Actuation of the control valve shall (1) At fire-resistant belt installa- cause water to flow into the branch tions, an amount which will fully en- lines and discharge from the nozzles. velop the belt drive, belt takeup, elec- (b) Nozzles attached to the branch trical controls, gear reducing unit, and lines shall be full cone, corrosion re- the conveyor belt over a distance of 50 sistant and provided with blow-off dust feet; and, covers. The spray application rate shall (2) At nonfire-resistant belt installa- not be less than 0.25 gallon per minute tions, an amount which will fully en- per square foot of the top surface of the velop the belt drive, belt takeup elec- top belt and the discharge shall be di- trical controls, gear reducing unit, and rected at both the upper and bottom the conveyor belt over a distance of 150 surfaces of the top belt and to the feet. upper surface of the bottom belt. (c) The foam generator shall be equipped with a warning device de- § 75.1101–2 Installation of deluge-type signed to stop the belt drive when a sprays. fire occurs and all such warning de- Deluge-type water spray systems vices shall be capable of giving both an shall provide protection for the belt audible and visual signal when actu- drive and 50 feet of fire-resistant belt ated by fire. or 150 feet of nonfire-resistant belt ad- (d) Water, power, and chemicals re- jacent to the belt drive. quired shall be adequate to maintain water or foam flow for no less than 25 § 75.1101–3 Water requirements. minutes. Deluge-type water spray systems (e) Water systems shall include shall be attached to a water supply. strainers with a flush-out connection Water so supplied shall be free of exces- and a manual shut-off valve. sive sediment and noncorrosive to the system Water pressure shall be main- § 75.1101–6 Water sprinkler systems; tained consistent with the pipe, fit- general. tings, valves, and nozzles at all times. Water sprinkler systems may be in- Water systems shall include strainers stalled to protect main and secondary with a flush-out connection and a man- belt-conveyor drives, however, where ual shut-off valve. The water supply such systems are employed, they shall shall be adequate to provide flow for 10 be installed and maintained in accord- minutes except that pressure tanks ance with §§ 75.1101–7 through 75.1101–11. used as a source of water supply shall be of 1,000-gallon capacity for a fire-re- § 75.1101–7 Installation of water sprin- sistant belt and 3,000 gallons for a kler systems; requirements. nonfire-resistant belt may be provided. (a) The fire-control components of each water sprinkler system shall be § 75.1101–4 Branch lines. installed, as far as practicable in ac- As a part of the deluge-type water cordance with the recommendations spray system, two or more branch lines set forth in National Fire Protection of nozzles shall be installed. The max- Association 1968–69 edition, Code No. imum distance between nozzles shall 13, ‘‘Installation of Sprinkler Systems’’ not exceed 8 feet. and such systems’ components shall be

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of a type approved by the Under- temperature and each such warning de- writers’ Laboratories, Inc., Factory vice shall be capable of giving both an Mutual Research Corp. audible and visual warning when a fire (b) Each sprinkler system shall pro- occurs. vide protection for the motor drive belt takeup, electrical controls, gear reduc- § 75.1101–11 Inspection of water sprin- ing unit, and the 50 feet of fire-resist- kler systems. ant belt, or 150 feet of nonfire-resistant Each water sprinkler system shall be belt adjacent to the belt drive. examined weekly and a functional test (c) The components of each water of the complete system shall be con- sprinkler system shall be located so as ducted at least once each year. to minimize the possibility of damage by roof fall or by the moving belt and § 75.1101–12 Equivalent dry-pipe sys- its load. tem. Where water sprinkler systems are § 75.1101–8 Water sprinkler systems; installed to protect main and sec- arrangement of sprinklers. ondary belt conveyor drives and freez- (a) At least one sprinkler shall be in- ing temperatures prevail, an equivalent stalled above each belt drive, belt take- dry-pipe system may be installed. up, electrical control, and gear-reducing unit, and individual sprinklers § 75.1101–13 Dry powder chemical sys- shall be installed at intervals of no tems; general. more than 8 feet along all conveyor Self-contained dry powder chemical branch lines. systems may be installed to protect (b) Two or more branch lines, at least main and secondary belt conveyor one of which shall be above the top belt drives, however, where such systems and one between the top and bottom are employed, they shall be installed belt, shall be installed in each sprin- and maintained in accordance with the kler system to provide a uniform dis- provisions of §§ 75.1101–14 through charge of water to the belt surface. 75.1101–22. (c) The water discharge rate from the sprinkler system shall not be less than § 75.1101–14 Installation of dry powder 0.25 gallon per minute per square foot chemical systems. of the top surface of the top belt and (a) Self-contained dry powder chem- the discharge shall be directed at both ical systems shall be installed to pro- the upper and bottom surfaces of the tect each belt-drive, belt takeup, elec- top belt and to the upper surface of the trical-controls, gear reducing units and bottom belt. The supply of water shall 50 feet of fire-resistant belt or 150 feet be adequate to provide a constant flow of non-fire-resistant belt adjacent to of water for 10 minutes with all sprin- the belt drive. klers functioning. (b) The fire-control components of (d) Each individual sprinkler shall be each dry powder chemical system shall activated at a temperature of not less be a type approved by the Under- than 150 °F. and not more than 300 °F. writers’ Laboratories, Inc., or Factory (e) Water systems shall include Mutual Engineering Corp. strainers with a flush-out connection (c) The components of each dry pow- and a manual shut-off valve. der chemical system shall be located so as to minimize the possibility of dam- § 75.1101–9 Back-up water system. age by roof fall or by the moving belt One fire hose outlet together with a and its load. length of hose capable of extending to the belt drive shall be provided within § 75.1101–15 Construction of dry pow- 300 feet of each belt drive. der chemical systems. (a) Each self-contained dry powder § 75.1101–10 Water sprinkler systems; system shall be equipped with hose or fire warning devices at belt drives. pipe lines which are no longer than Each water sprinkler system shall be necessary. equipped with a device designed to stop (b) Metal piping and/or hose between the belt drive in the event of a rise in control valves and nozzles shall have a

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minimum bursting pressure of 500 § 75.1101–19 Nozzles; flow rate and di- p.s.i.g. rection. (c) Hose shall be protected by wire The nozzles of each dry powder chem- braid or its equivalent. ical system shall be capable of dis- (d) Nozzles and reservoirs shall be charging all powder within 1 minute sufficient in number to provide max- after actuation of the system and such imum protection to each belt, belt nozzles shall be directed so as to mini- takeup, electrical controls, and gear mize the effect of ventilation upon fire reducing unit. control. (e) Each belt shall be protected on the top surface of both the top and bot- § 75.1101–20 Safeguards for dry pow- tom belts and the bottom surface of der chemical systems. the top belt. Adequate guards shall be provided along all belt conveyors in the vicinity § 75.1101–16 Dry powder chemical systems; sensing and fire-suppression of each dry powder chemical system to devices. protect persons whose vision is restricted by a discharge of powder from (a) Each self-contained dry powder the system. In addition, hand-rails chemical system shall be equipped with shall be installed in such areas to pro- sensing devices which shall be designed vide assistance to those passing along to activate the fire-control system, the conveyor after a powder discharge. sound an alarm and stop the conveyor drive motor in the event of a rise in § 75.1101–21 Back-up water system. temperature, and provision shall be made to minimize contamination of One fire hose outlet together with a the lens of any optical sensing device length of hose capable of extending to installed in such system. the belt drive shall be provided within (b) Where sensors are operated from 300 feet of each belt drive. the same power source as the belt § 75.1101–22 Inspection of dry powder drive, each sensor shall be equipped chemical systems. with a standby power source which shall be capable of remaining operative (a) Each dry powder chemical system for at least 4 hours after a power cut- shall be examined weekly and a func- off. tional test of the complete system (c) Sensor systems shall include a shall be conducted at least once each warning indicator (or test circuit) year. which shows it is operative. (b) Where the dry powder chemical (d) Each fire-suppression system system has been actuated, all compo- shall be equipped with a manually op- nents of the system shall be cleaned erated control valve which shall be immediately by flushing all powder independent of the sensor. from pipes and hoses and all hose damaged by fire shall be replaced. § 75.1101–17 Sealing of dry powder chemical systems. § 75.1102 Slippage and sequence switches. Each dry powder chemical system shall be adequately sealed to protect [STATUTORY PROVISIONS] all components of the system from moisture dust, and dirt. Underground belt conveyors shall be equipped with slippage and sequence § 75.1101–18 Dry powder requirements. switches. Each dry powder chemical system § 75.1103 Automatic fire warning de- shall contain the following minimum vices. amounts of multipurpose dry powder: [STATUTORY PROVISIONS] Dry Belt powder, pounds On or before May 29, 1970, devices shall be installed on all such belts Fire resistant ...... 125 which will give a warning automati- Non-fire resistant ...... 250 cally when a fire occurs on or near

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such belt. The Secretary shall pre- § 75.1103–4 Automatic fire sensor and scribe a schedule for installing fire sup- warning device systems; installa- pression devices on belt haulageways. tion; minimum requirements. (a) Effective December 31, 2009, auto- § 75.1103–1 Automatic fire sensors. matic fire sensor and warning device A fire sensor system shall be in- systems that use carbon monoxide sen- stalled on each underground belt con- sors shall provide identification of fire veyor. Sensors so installed shall be of a along all belt conveyors. type which will (a) give warning auto- (1) Carbon monoxide sensors shall be matically when a fire occurs on or near installed at the following locations: such belt; (b) provide both audible and (i) Not more than 100 feet downwind visual signals that permit rapid loca- of each belt drive unit, each tailpiece tion of the fire. transfer point, and each belt take-up. If the belt drive, tailpiece, and/or take-up § 75.1103–2 Automatic fire sensors; ap- for a single transfer point are installed proved components; installation requirements. together in the same air course, and the distance between the units is less (a) The components of each auto- than 100 feet, they may be monitored matic fire sensor required to be in- with one sensor downwind of the last stalled in accordance with the provi- component. If the distance between the sions of § 75.1103–1 shall be of a type and units exceeds 100 feet, additional sen- installed in a manner approved by the sors are required downwind of each belt Secretary, or the components shall be drive unit, each tailpiece transfer of a type listed, approved and installed point, and each belt take-up; in accordance with the recommenda- (ii) Not more than 100 feet downwind tions of a nationally recognized testing of each section loading point; laboratory approved by the Secretary. (iii) Along the belt entry so that the (b) Where applicable, and not incon- spacing between sensors does not ex- sistent with these regulations, auto- ceed 1,000 feet. Where air velocities are matic fire sensors shall be installed in less than 50 feet per minute, spacing accordance with the recommendations must not exceed 350 feet; and set forth in National Fire Code No. 72A (iv) The mine operator shall indicate ‘‘Local Protective Signaling Systems’’ the locations of all carbon monoxide (NFPA No. 72A–1967). National Fire sensors on the mine maps required by Code No. 72A (1967) is hereby incor- §§ 75.1200 and 75.1505 of this part. porated by reference and made a part (2) Where used, sensors responding to hereof. National Fire Code No. 72A is radiation, smoke, gases, or other indi- available for examination at each cations of fire, shall be spaced at reg- MSHA Coal Mine Safety and Health ular intervals to provide protection district office, and may be obtained equivalent to carbon monoxide sensors, from the National Fire Protection As- and installed within the time specified sociation, 11 Tracy Drive, Avon, MA in paragraph (a)(3) of this section. 02322; Telephone: 800–344–3555 (toll free); (3) When the distance from the tail- http://www.nfpa.org. piece at loading points to the first [37 FR 16546, Aug. 16, 1972, as amended at 71 outby sensor reaches the spacing re- FR 16668, Apr. 3, 2006] quirements in § 75.1103–4(a)(1)(iii), an additional sensor shall be installed and § 75.1103–3 Automatic fire sensor and put in operation within 24 production warning device systems; minimum requirements; general. shift hours. When sensors of the kind described in paragraph (a)(2) of this Automatic fire sensor and warning section are used, they shall be installed device systems installed in belt and put in operation within 24 produc- haulageways of underground coal tion shift hours after the equivalent mines shall be assembled from compo- distance which has been established for nents which meet the minimum re- the sensor from the tailpiece at loading quirements set forth in §§ 75.1103–4 points to the first outby sensor is first through 75.1103–7 unless otherwise ap- reached. proved by the Secretary. (b) Automatic fire sensor and warn- [37 FR 16545, Aug. 16, 1972] ing device systems shall be installed so

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as to minimize the possibility of dam- an effective warning signal at the fol- age from roof falls and the moving belt lowing locations: and its load. Sensors must be installed (1) At working sections and other near the center in the upper third of work locations where miners may be the entry, in a manner that does not endangered from a fire in the belt expose personnel working on the sys- entry. tem to unsafe conditions. Sensors must (2) At a manned surface location not be located in abnormally high where personnel have an assigned post areas or in other locations where air of duty. The manned surface location flow patterns do not permit products of must have: combustion to be carried to the sen- (i) A telephone or equivalent commu- sors. nication with all miners who may be (c) Infrared, ultraviolet, and other endangered and sensors whose effectiveness is impaired (ii) A map or schematic that shows by contamination shall be protected the locations of sensors, and the in- from dust, dirt, and moisture. tended air flow direction at these loca- (d) The voltage of automatic fire sen- tions. This map or schematic must be sor and warning device systems shall updated within 24 hours of any change not exceed 120 volts. in this information. (e) Except when power must be cut (3) The automatic fire sensor and off in the mine under the provisions of warning device system shall be mon- § 75.313, automatic fire sensor and itored for a period of 4 hours after the warning device systems shall be capa- belt is stopped, unless an examination ble of giving warning of fire for a min- for hot rollers and fire is made as pre- imum of 4 hours after the source of scribed in § 75.1103–4(e). power to the belt is removed unless the (b) The fire sensor and warning de- belt haulageway is examined for hot vice system shall include a means for rollers and fire as provided in para- rapid evaluation of electrical short and graph (e) (1) or (2) of this section. open circuits, ground faults, pneumatic (1) When an unplanned removal of leaks, or other defect detrimental to power from the belt occurs an examina- its proper operational condition. tion for hot rollers and fire in the oper- (c) Automatic fire sensor and warn- ating belts of a conveyor system shall ing devices shall include a manual be completed within 2 hours after the reset feature. belt has stopped. (d) When a malfunction or warning signal is received at the manned sur- (2) When a preplanned removal of face location, the sensors that are acti- power from the belt occurs an examina- vated must be identified and appro- tion for hot rollers and fire on the op- priate personnel immediately notified. erating belts of a conveyor system may (e) Upon notification of a malfunc- commence not more than 30 minutes tion or warning signal, appropriate per- before the belts are stopped and shall sonnel must immediately initiate an be completed within 2 hours after the investigation to determine the cause of examination is commenced, or the ex- the malfunction or warning signal and amination shall be commenced when take the required actions set forth in the belts are stopped and completed paragraph (f) of this section. within 2 hours after the belts are (f) If any sensor indicates a warning, stopped. the following actions must be taken [37 FR 16545, Aug. 16, 1972, as amended at 57 unless the mine operator determines FR 20928, May 15, 1992; 73 FR 80614, Dec. 31, that the signal does not present a haz- 2008] ard to miners: (1) Appropriate personnel must notify § 75.1103–5 Automatic fire warning de- miners in affected working sections, in vices; actions and response. affected areas where mechanized min- (a) When the carbon monoxide level ing equipment is being installed or re- reaches 10 parts per million above the moved, and at other locations specified established ambient level at any sensor in the approved mine emergency evacu- location, automatic fire sensor and ation and firefighting program of in- warning device systems shall provide struction; and

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(2) All miners in the affected areas, (6) Handheld detectors used to mon- unless assigned emergency response du- itor the belt entry under this section ties, must be immediately withdrawn must have a detection level equivalent to a safe location identified in the to that of the system’s carbon mon- mine emergency evacuation and fire- oxide sensors. fighting program of instruction. [37 FR 16545, Aug. 16, 1972, as amended at 73 (g) If the warning signal will be acti- FR 80615, Dec. 31, 2008] vated during calibration of sensors, personnel manning the surface location § 75.1103–6 Automatic fire sensors; ac- must be notified prior to and upon tuation of fire suppression systems. completion of calibration. Affected Point-type heat sensors or automatic working sections, areas where mecha- fire sensor and warning device systems nized mining equipment is being in- may be used to actuate deluge-type stalled or removed, or other areas des- water systems, foam generator sys- ignated in the approved emergency tems, multipurpose dry-powder sys- evacuation and firefighting program of tems, or other equivalent automatic instruction must be notified at the be- fire suppression systems. ginning and completion of calibration. (h) If any fire detection component [73 FR 80615, Dec. 31, 2008] becomes inoperative, immediate action must be taken to repair the compo- § 75.1103–7 Electrical components; permissibility requirements. nent. While repairs are being made, operation of the belt may continue if the The electrical components of each following requirements are met: automatic fire sensor and warning de- (1) If one sensor becomes inoperative, vice system shall: a trained person must continuously (a) Remain functional when the monitor for carbon monoxide at the in- power circuits are deenergized as re- operative sensor; quired by § 75.706; and (2) If two or more adjacent sensors (b) Be provided with protection become inoperative, trained persons against ignition of methane or coal must patrol and continuously monitor dust when the electrical power is deen- the affected areas for carbon monoxide ergized as required by § 75.313, but these so that they will be traveled each hour components shall be permissible or in- in their entirety. Alternatively, a trinsically safe if installed in a return trained person must be stationed at airway. each inoperative sensor to monitor for [37 FR 16546, Aug. 16, 1972, as amended at 57 carbon monoxide; FR 20929, May 15, 1992] (3) If the complete fire detection system becomes inoperative, trained per- § 75.1103–8 Automatic fire sensor and sons must patrol and continuously warning device systems; examina- monitor the affected areas for carbon tion and test requirements. monoxide so that they will be traveled (a) Automatic fire sensor and warn- each hour in their entirety; ing device systems shall be examined (4) Trained persons who conduct at least once each shift when belts are monitoring under this section must operated as part of a production shift. have two-way voice communication ca- A functional test of the warning sig- pability, at intervals not to exceed nals shall be made at least once every 2,000 feet, and must report carbon mon- seven days. Examination and mainte- oxide concentrations to the surface at nance of such systems shall be by a intervals not to exceed one hour; qualified person. (5) Trained persons who conduct (b) A record of the functional test monitoring under this section must im- conducted in accordance with para- mediately report to the surface any graph (a) of this section shall be main- concentration of carbon monoxide that tained by the operator and kept for a reaches 10 parts per million above the period of one year. established ambient level, unless the (c) Sensors shall be calibrated in ac- mine operator knows that the source of cordance with the manufacturer’s cali- the carbon monoxide does not present a bration instructions at intervals not to hazard to miners; and exceed 31 days. A record of the sensor

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calibrations shall be maintained by the (d) The fire suppression system re- operator and kept for a period of one quired at the belt drive shall include year. the belt discharge head. (e) A crew consisting of at least five [73 FR 80615, Dec. 31, 2008] members for each working shift shall § 75.1103–9 Minimum requirements; be trained in firefighting operations. fire suppression materials and loca- Fire drills shall be held at intervals not tion; maintenance of entries and exceeding 6 months. crosscuts; access doors; communications; fire crews; high-expansion [37 FR 16546, Aug. 16, 1972] foam devices. § 75.1103–10 Fire suppression systems; (a) The following materials shall be additional requirements. stored within 300 feet of each belt drive For each conveyor belt flight exceed- or at a location where the material can ing 2,000 feet in length, where the aver- be moved to the belt drive within 5 age air velocity along the belt haulage minutes, except that when the ven- entry exceeds 100 feet per minute, an tilating current in the belt haulageway additional cache of the materials speci- travels in the direction of the normal fied in § 75.1103–9(a)(1), (2), and (3) shall movement of coal on the belt, the ma- be provided. The additional cache may terials shall be stored within 300 feet of be stored at the locations specified in the belt tailpiece or at a location § 75.1103–9(a), or at some other strategic where the materials can be moved to location readily accessible to the con- the belt tailpiece within 5 minutes. veyor belt flight. (1) 500 feet of fire hose, except that if the belt flight is less than 500 feet in [73 FR 80616, Dec. 31, 2008] length the fire hose may be equal to the length of the belt flight. A high ex- § 75.1103–11 Tests of fire hydrants and fire hose; record of tests. pansion foam device may be substituted for 300 feet of the 500 feet of Each fire hydrant shall be tested by the fire hose. Where used, such foam opening to insure that it is in oper- generators shall produce foam suffi- ating condition, and each fire hose cient to fill 100 feet of the belt shall be tested, at intervals not exceed- haulageway in not more than 5 mining 1 year. A record of these tests shall utes. Sufficient power cable and water be maintained at an appropriate loca- hose shall be provided so that the foam tion. generator can be installed at any cross- [37 FR 16546, Aug. 16, 1972] cut along the belt by which the generator is located. A 1-hour supply of foam § 75.1104 Underground storage, lubri- producing chemicals and tools and cating oil and grease. hardware required for its operation [STATUTORY PROVISIONS] shall be stored at the foam generator. (2) Tools to open a stopping between Underground storage places for lubri- the belt entry and the adjacent intake cating oil and grease shall be of fire- entry; and proof construction. Except for specially (3) 240 pounds of bagged rock dust. prepared materials approved by the (b) The entry containing the main Secretary, lubricating oil and grease waterline and the crosscuts containing kept in all underground areas in a coal water outlets between such entry and mine shall be in fireproof, closed metal the belt haulageway (if the main wa- containers or other no less effective terline is in an adjacent entry) shall be containers approved by the Secretary. maintained accessible and in safe condition for travel and firefighting ac- § 75.1106 Welding, cutting, or soldering tivities. Each stopping in such cross- with arc or flame underground. cuts or adjacent crosscuts shall have [STATUTORY PROVISIONS] an access door. (c) Suitable communication lines ex- All welding, cutting, or soldering tending to the surface shall be provided with arc or flame in all underground in the belt haulageway or adjacent areas of a coal mine shall, whenever entry. practicable, be conducted in fireproof

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enclosures. Welding, cutting, or sol- uefied and nonliquefied compressed gas dering with arc or flame in other than cylinders are transported by a trolley a fireproof enclosure shall be done wire haulage system into or through an under the supervision of a qualified underground coal mine, such cylinders person who shall make a diligent shall be placed in well insulated and search for fire during and after such substantially constructed containers operations and shall, immediately be- which are specifically designed for fore and during such operations, con- holding such cylinders. tinuously test for methane with means (c) Liquefied and nonliquefied com- approved by the Secretary for detect- pressed gas cylinders shall not be ing methane. Welding, cutting, or sol- transported on mantrips. dering shall not be conducted in air [36 FR 22061, Nov. 19, 1971] that contains 1.0 volume per centum or more of methane. Rock dust or suitable § 75.1106–3 Storage of liquefied and fire extinguishers shall be immediately nonliquefied compressed gas cyl- available during such welding, cutting inders; requirements. or soldering. (a) Liquefied and nonliquefied compressed gas cylinders stored in an un- § 75.1106–1 Test for methane. derground coal mine shall be: Until December 31, 1970, a permissible (1) Clearly marked and identified as flame safety lamp may be used to to their contents in accordance with make tests for methane required by the Department of Transportation regula- regulations in this part. On and after tions. December 31, 1970 a methane detector (2) Placed securely in storage areas approved by the Secretary shall be designated by the operator for such used for such tests and a permissible purpose, and where the height of the flame safety lamp may be used as a coalbed permits, in an upright position, supplemental testing device. A person preferably in specially designated qualified to test for methane under racks, or otherwise secured against § 75.151 will be a qualified person for the being accidently tipped over. purpose of this section. (3) Protected against damage from falling material, contact with power TRANSPORTATION, HANDLING AND STOR- lines and energized electrical equip- AGE OF LIQUEFIED AND NONLIQUEFIED ment, heat from welding, cutting or COMPRESSED GAS CYLINDERS soldering, and exposure to flammable liquids. § 75.1106–2 Transportation of liquefied (b) Liquefied and nonliquefied com- and nonliquefied compressed gas pressed gas cylinders shall not be cylinders; requirements. stored or left unattended in any area (a) Liquefied and nonliquefied com- inby the last open crosscut of an under- pressed gas cylinders transported into ground coal mine. or through an underground coal mine (c) When not in use, the valves of all shall be: liquefied and nonliquefied compressed (1) Placed securely in devices de- gas cylinders shall be in the closed po- signed to hold the cylinder in place sition, and all hoses shall be removed during transit on self-propelled equip- from the cylinder. ment or belt conveyors; [36 FR 22061, Nov. 19, 1971] (2) Disconnected from all hoses and gages; § 75.1106–4 Use of liquefied and non- (3) Equipped with a metal cap or liquefied compressed gas cylinders; ‘‘headband’’ (fence-type metal pro- general requirements. tector around the valve stem) to pro- (a) Persons assigned by the operator tect the cylinder valve during transit; to use and work with liquefied and non- and, liquefied compressed gas shall be (4) Clearly labeled ‘‘empty’’ or ‘‘MT’’ trained and designated by the operator when the gas in the cylinder has been as qualified to perform the work to expended. which they are assigned, and such (b) In addition to the requirements of qualified persons shall be specifically paragraph (a) of this section, when liq- instructed with respect to the dangers

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inherent in the use of such gases in an (b) Defective cylinders, cylinder ac- underground coal mine. cessories, torches, and other welding, (b) Persons who perform welding, cutting, and burning equipment shall cutting, or burning operations shall be labeled ‘‘defective’’ and taken out of wear clothing free from excessive oil or service. grease. (c) Each qualified person assigned to (c) Liquefied and nonliquefied com- perform welding, cutting, or burning pressed gas shall be used only in well- with liquefied and nonliquefied com- ventilated areas. pressed gas shall be equipped with a (d) Not more than one liquefied or wrench specifically designed for use nonliquefied compressed gas unit, con- with liquefied and nonliquefied com- sisting of one oxygen cylinder and one pressed gas cylinders and a suitable additional gas cylinder, shall be used torchtip cleaner to maintain torches in to repair any unit of equipment which a safe operating condition. is inby the loading point of any sec- (d) Tests for leaks on the hose valves tion. or gages of liquefied and nonliquefied (e) Where liquefied and nonliquefied compressed gas cylinders shall only be compressed gas is used regularly in un- made with a soft brush and soapy water derground shops or other underground or soap suds, or other device approved structures, such shops or structures by the Secretary. shall be on a separate split of air. [36 FR 22062, Nov. 19, 1971] (f) Where liquefied and nonliquefied compressed gas is used in any area in § 75.1106–6 Exemption of small low which oil, grease, or coal dust is pressure gas cylinders containing present, oil and grease deposits shall, nonflammable or nonexplosive gas where practicable, be removed and the mixtures. entire area within 10 feet of the work- Small low pressure gas cylinders con- site covered with a heavy coating of taining nonflammable or nonexplosive rock dust. gas mixtures, which provide for the (g) Liquefied and nonliquefied com- emission of such gas under a pressure pressed gas cylinders shall be located reduced from a pressure which does not no less than 10 feet from the worksite, exceed 250 p.s.i.g., and which is manu- and where the height of the coal seam factured and sold in conformance with permits, they shall be placed in an up- U.S. Department of Transportation right position and chained or otherwise Special Permit No. 6029 as a calibration secured against falling. test kit for methane monitoring sys- (h) Liquefied and nonliquefied com- tems, shall be exempt from the require- pressed gas shall not be used under di- ments of §§ 75.1106–2(c) and 75.1106–4(d), rect pressure from the cylinder and, (f) and (g). where such gases are used under re- [36 FR 22062, Nov. 19, 1971] duced pressure, the pressure level shall not exceed that recommended by the FIRE SUPPRESSION DEVICES AND FIRE- manufacturer. RESISTANT HYDRAULIC FLUIDS ON UN- (i) ‘‘Manifolding cylinders’’ shall DERGROUND EQUIPMENT only be performed in well-ventilated shops where the necessary equipment § 75.1107 Fire suppression devices. is properly installed and operated in accordance with specifications for safe- [STATUTORY PROVISIONS] ty prescribed by the manufacturer. On and after March 30, 1971, fire-sup- [36 FR 22061, Nov. 19, 1971] pression devices meeting specifications prescribed by the Secretary shall be in- § 75.1106–5 Maintenance and tests of stalled on unattended underground liquefied and nonliquefied com- equipment and suitable fire-resistant pressed gas cylinders; accessories hydraulic fluids approved by the Sec- and equipment; requirements. retary shall be used in the hydraulic (a) Hose lines, gages, and other cyl- systems of such equipment. Such fluids inder accessories shall be maintained shall be used in the hydraulic systems in a safe operating condition. of other underground equipment unless

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fire suppression devices meeting speci- such jobsite during each production fications prescribed by the Secretary shift. are installed on such equipment. (d) Machines and devices described under paragraph (c) of this section § 75.1107–1 Fire-resistant hydraulic must be inspected for fire and the input fluids and fire suppression devices on underground equipment. powerline deenergized when workmen leave the area for more than 30 min- (a)(1) Unattended electrically pow- utes. ered equipment used underground which uses hydraulic fluid shall use ap- [37 FR 15301, July 29, 1972] proved fire-resistant hydraulic fluid. (2) Except as provided in paragraph § 75.1107–2 Approved fire-resistant hy- (a) (3) of this section, within 24 produc- draulic fluids; minimum require- tion shift hours after being installed, ments. unattended electrically powered equip- Fire-resistant hydraulic fluids and ment used underground shall be concentrates required to be employed equipped with a fire suppression device in the hydraulic system of underground which meets the applicable require- equipment in accordance with the pro- ments of §§ 75.1107–3 through 75.1107–16. visions of § 75.1107–1 shall be considered (3) Unattended enclosed motors, con- suitable only if they have been pro- trols, transformers, rectifiers, and duced under an approval, or any modi- other similar noncombustible elec- fication thereof, issued pursuant to trically powered equipment containing Part 35 Subchapter I of this chapter no flammable fluid may be protected: (Bureau of Mines Schedule 30), or any (i) By an approved fire suppression revision thereof. device, or (ii) Be located at least 2 feet from [37 FR 15301, July 29, 1972] coal or other combustible materials, or (iii) Be separated from the coal or § 75.1107–3 Fire suppression devices; combustible materials by a 4-inch- approved components; installation thick masonry firewall or equivalent; requirements. and be mounted on a minimum 4-inch- (a) The components of each fire sup- thick noncombustible surface, plat- pression device required to be installed form, or equivalent. The electrical ca- in accordance with the provisions of bles at such equipment shall conform § 75.1107–1 shall be approved by the Sec- with the requirements of Part 18 of this retary, or where appropriate be listed chapter (Bureau of Mines Schedule 2G) as approved by a nationally recognized or be in metal conduit. agency approved by the Secretary. (b) Attended electrically powered (b) Where used, pressure vessels shall equipment used underground which uses hydraulic fluid shall use approved conform with the requirements of sec- fire-resistant hydraulic fluid unless tions 3603, 3606, 3607, 3707, and 3708 of such equipment is protected by a fire National Fire Code No. 22 ‘‘Water suppression device which meets the ap- Tanks for Private Fire Protection’’ plicable requirements of §§ 75.1107–3— (NFPA No. 22–1971). 75.1107–16. (c) The cover of hose of fire suppres- (c) For purpose of §§ 75.1107—75.1107–16 sion devices, if used on the protected the following underground equipment equipment and installed after the effec- shall be considered attended equip- tive date of this section, shall meet the ment: flame-resistant requirements of Part 18 (1) Any machine or device regularly of this chapter (Bureau of Mines Sched- operated by a miner assigned to oper- ule 2G). ate such machine or device; (d) Fire suppression devices required (2) Any machine or device which is to be installed in accordance with the mounted in the direct line of sight of a provisions of § 75.1107–1 shall where ap- jobsite which is located within 500 feet propriate be installed in accordance of such machine or device and which with the manufacturer’s specifications. jobsite is regularly occupied by a miner assigned to perform job duties at [37 FR 15301, July 29, 1972]

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§ 75.1107–4 Automatic fire sensors and other protective device) actuates. On manual actuators; installation; min- attended equipment powered through a imum requirements. trailing cable the fire suppression de- (a)(1) Where fire suppression devices vice shall operate independently of the are installed on unattended under- electrical power provided by the cable. ground equipment, one or more point- (d) Point-type sensors (such as ther- type sensors or equivalent shall be in- mocouple, bimetallic strip, or rate of stalled for each 50 square feet of top temperature rise) located in ventilated surface area, or fraction thereof, of passageways shall be installed down- such equipment, and each sensor shall wind from the equipment to be probe designed to activate the first sup- tected. pression system and disconnect the (e) Sensor systems shall include a de- electrical power source to the equip- vice or method for determining their ment protected, and, except where operative condition. sprinklers are used, there shall be in [37 FR 15301, July 29, 1972] addition, a manual actuator installed to operate the system. Where sprin- § 75.1107–5 Electrical components of klers are used, provision shall be made fire suppression devices; permissi- for manual application of water to the bility requirements. protected equipment in lieu of a man- The electrical components of each ual actuator. fire suppression device used on permis- (2) Two or more manual actuators, sible equipment inby the last open where practicable, shall be installed, as crosscut or on equipment in the return provided in paragraphs (a)(2) (i) and (ii) airways of any coal mine shall be per- of this section, to activate fire suppres- missible or intrinsically safe and such sion devices on attended equipment components shall be maintained in per- purchased on or after the effective date missible or intrinsically safe condition. of this § 75.1107–4. At least one manual [37 FR 15302, July 29, 1972] actuator shall be used on equipment purchased prior to the effective date of § 75.1107–6 Capacity of fire suppres- this § 75.1107–4. sion devices; location and direction (i) Manual actuators installed on at- of nozzles. tended equipment regularly operated (a) Each fire suppression device shall by a miner, as provided in § 75.1107– be: 1(c)(1) shall be located at different lo- (1) Adequate in size and capacity to cations on the equipment, and at least extinguish potential fires in or on the one manual actuator shall be located equipment protected; and within easy reach of the operator’s nor- (2) Suitable for the atmospheric con- mal operating position. ditions surrounding the equipment pro- (ii) Manual actuators to activate fire tected (e.g., air velocity, type, and suppression devices on attended equip- proximity of adjacent combustible ma- ment not regularly operated by a terial); and miner, as provided in § 75.1107–1(c)(2), (3) Rugged enough to withstand shall be installed at different location, rough usage and vibration when in- and at least one manual actuator shall stalled on mining equipment. be installed so as to be easily reached (b) The extinguishant-discharge noz- by the miner at the jobsite or by per- zles of each fire suppression device sons approaching the equipment. shall, where practicable, be located so (b) Sensors shall, where practicable, as to take advantage of mine ventila- be installed in accordance with the rection air currents. The fire suppression ommendations set forth in National device may be of the internal injection, Fire Code No. 72A ‘‘Local Protective inundating, or combination type. Signaling Systems’’ (NFPA No. 72A– Where fire control is achieved by inter- 1967). nal injection, or combination of inter- (c) On unattended equipment the fire nal injection and inundation, haz- suppression device shall operate inde- ardous locations shall be enclosed to pendently of the power to the main minimize runoff and overshoot of the motor (or equivalent) so it will remain extinguishing agent and the extin- operative if the circuit breakers (or guishing agent shall be directed onto:

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(1) Cable reel compartments and elec- (e) On equipment provided with a trical cables on the equipment which cable reel and an internal injection or are subject to flexing or to external combination-type system, the amount damage; and of water discharged into the cable reel (2) All hydraulic components on the compartments shall be approximately equipment which are exposed directly 25 percent of the amount required to be to or located in the immediate vicinity discharged by the system, however, of electrical cables which are subject such quantity need not exceed 10 gal- to flexing or to damage. lons. [37 FR 15302, July 29, 1972] (f) Liquid chemicals may be used, as approved by the Secretary in self-con- § 75.1107–7 Water spray devices; capac- tained fire suppression devices. Such ity; water supply; minimum re- liquid chemicals shall be nontoxic and quirements. when applied to a fire shall not produce (a) Where water spray devices are excessive toxic compounds. The quan- used on unattended underground equip- tity of liquid chemicals required shall ment the rate of flow shall be at least be proportionately less than water as 0.25 gallon per minute per square foot based on equivalency ratings estab- over the top surface area of the equip- lished by the Secretary or equivalency ment and the supply of water shall be ratings made by a nationally recog- adequate to provide the required flow nized agency approved by the Sec- of water for 10 minutes. retary. (b) Where water spray devices are used for inundating attended under- [37 FR 15302, July 29, 1972] ground equipment the rate of flow shall be at least 0.18 gallon per minute per § 75.1107–8 Fire suppression devices; square foot over the top surface area of extinguishant supply systems. the equipment (excluding conveyors, (a) Fire suppression systems using cutters, and gathering heads), and the water or liquid chemical to protect at- supply of water shall be adequate to tended equipment shall: provide the required flow of water for (1) Be maintained at a pressure con- 10 minutes. sistent with the pipe, fittings, valves, (c) Where water is used for internal and nozzles used in the system. injection on attended equipment the (2) Be located so as to be protected total quantity of water shall be at against damage during operation of the least 4.5 gallons times the number of equipment protected. hazardous locations; however, the total (3) Employ liquid which is free from minimum amount of water shall not be excessive sediment and noncorrosive to less than the following: the system. (4) Include strainers equipped with Type of equipment Water in gallons flush-out connections or equivalent (1) Cutting machines ...... 36 protective devices and a rising stem or (2) Continuous miners ...... 36 other visual indicator-type shutoff (3) Haulage vehicles ...... 22.5 valve. (4) All other attended equipment ...... 18.0 (b) Water supplies for fire suppression devices installed on underground The rate of flow shall be not less than equipment may be maintained in 7 gallons per minute. mounted water tanks or by connection (d) Where water is used in a combina- to water mains. Such water supplies tion internal injection and inundation shall be continuously connected to the system on attended equipment the rate fire suppression device whenever the of flow shall be at least 0.12 gallon per equipment is connected to a power minute per square foot over the top source, except for a reasonable time for surface area of the equipment (exclud- changing hose connections to hydrants ing conveyors, cutters, and gathering while the machine is stopped in a ven- heads), and the supply of water shall be tilated passageway. adequate to provide the required flow of water for 10 minutes. [37 FR 15302, July 29, 1972]

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§ 75.1107–9 Dry chemical devices; ca- than the following, except that sys- pacity; minimum requirements. tems on haulage vehicles installed (a) Dry chemical fire extinguishing prior to the effective date of this sec- systems used on underground equip- tion may contain 20 pounds (nominal). ment shall be of the multipurpose pow- Dry chem- der-type and shall include the fol- Type of equipment ical lowing: pounds (nominal) (1) The system including all hose and nozzles shall be protected against the (1) Cutting machines ...... 40 entrance of moisture, dust, or dirt; (2) Continuous miners ...... 40 (3) Haulage vehicles ...... 30 (2) The system shall be guarded (4) All other attended equipment ...... 20 against damage during operation of the equipment protected; (d) The amount of dry chemical dis- (3) Hose and pipe shall be as short as charged into the cable reel compart- possible; the distance between the ments of attended underground equip- chemical container and furthest nozzle ment shall be approximately 25 percent shall not exceed 50 feet; of the total amount required to be dis- (4) Hose, piping, and fittings between charged by the system; however, the the actuator and the chemical con- quantity discharged into cable reel tainer shall have a bursting pressure of compartments need not exceed 10 500 pounds per square inch (gage) or pounds. higher; the hose, piping, and fittings between the chemical container and [37 FR 15302, July 29, 1972] the nozzles shall have a bursting pressure of 300 pounds per square inch § 75.1107–10 High expansion foam devices; minimum capacity. (gage) or higher and (5) The system shall discharge in 1 (a) On unattended underground minute or less, for quantities less than equipment the amount of water deliv- 50 pounds (nominal) 1 and in less than 2 ered as high expansion foam for a pe- minutes for quantities more than 50 riod of approximately 20 minutes shall pounds; be not less than 0.06 gallon per minute (b) On unattended underground per square foot of surface area of the equipment, the number of pounds of equipment protected; however, the dry chemical employed by the system minimum total rate for any system shall be not less than 1 pound per shall be not less than 3 gallons per square foot of top surface area of the minute. equipment; however, the minimum (b) On attended underground equip- amount in any system shall be 20 ment, foam may be delivered by inter- pounds (nominal). The discharge shall nal injection, inundation, or combina- be directed into and on potentially haz- tion-type systems. Each system shall ardous locations of the equipment. deliver water as foam for a minimum (c) On attended underground equip- of 10 minutes. For internal injection, ment, the number of pounds (nominal) the rate of water application as high employed by the system shall equal 5 expansion foam shall be not less than times the total number of hazardous 0.5 gallon per minute per hazardous lo- locations; however, the minimum cation; however, the minimum total amount in any system shall not be less rate shall be not less than 2 gallons per minute. For inundation, the rate of 1 Many dry chemical systems were origi- water application as high expansion nally designed for sodium bicarbonate before foam shall be not less than 0.05 gallon all-purpose chemical (ammonium phosphate) per minute per square foot of top sur- was shown to be more effective. Sodium bi- face area of the equipment protected; carbonate is denser than ammonium phos- however, the minimum total rate shall phate; hence, for example, a 50-pound system be not less than 5 gallons of water per designed for the sodium bicarbonate will minute. hold slightly more by weight than all-purpose dry chemical (ammonium phosphate) by (c) In combined internal injection weight. The word ‘‘nominal’’ is used in and inundation systems the rate of § 75.1107–9 to express the approximate weight water applied as foam shall not be less in pounds of all-purpose dry chemical. than 0.035 gallon per minute per square

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foot of top surface area of the equip- (b) The fire suppression equipment ment protected; however, the minimum shall be designed to withstand the rig- total rate shall not be less than 3.5 gal- ors of the mine environment. Where lons of water per minute. used, pressure vessels shall conform (d) Where internal injection is em- with the requirements of section 3603, ployed, the amount of water discharged 3606, 3607, 3707, and 3708 of National as high expansion foam into the cable Fire Code No. 22 ‘‘Water Tanks for Pri- reel compartments of underground vate Fire Protection’’ (NFPA No. 22– equipment regularly operated by a 1971). miner shall be approximately 25 per- (c) The cover of hose of fire suppres- cent of the total amount required to be sion devices, if used on the protected discharged by the system; however, the equipment, shall meet the flame-resist- quantity of water discharged as foam ant requirements of Part 18 of this into the cable reel compartment need chapter (Bureau of Mines Schedule 2G). not exceed 1.5 gallons. (d) Extinguishing agents shall not [37 FR 15303, July 29, 1972] create a serious toxic or other hazard to the miners. § 75.1107–11 Extinguishing agents; re- (e) The electrical components of the quirements on mining equipment fire suppression device shall meet the employed in low coal. requirements for electrical components On mining equipment no more than of the mining machine. 32 inches high, the quantity of extin- (f) Where used, manual actuators for guishing agent required under the pro- initiating the operation of the fire sup- visions of §§ 75.1107–7, 75.1107–9, and pression device shall be readily acces- 75.1107–10 may be reduced by one-fourth sible to the machine operator. On unat- if space limitations on the equipment tended equipment, an automatic as require such reduction. well as a manual actuator shall be provided. [37 FR 15303, July 29, 1972] (g) On unattended equipment the fire § 75.1107–12 Inerting of mine atmos- suppression device shall operate inde- phere prohibited. pendently of the power to the main motor (or equivalent) so it will remain No fire suppression device designed operative if the circuit breakers (or to control fire by total flooding shall other protective device) actuates. On be installed to protect unattended unattended equipment powered through a derground equipment except in en- trailing cable the fire suppression de- closed dead-end entries or enclosed vice shall operate independently of the rooms. electrical power provided by the cable. [37 FR 15303, July 29, 1972] (h) On unattended equipment, the sensor system shall have a means for § 75.1107–13 Approval of other fire checking its operative condition. suppression devices. (i) The fire suppression agent shall be Notwithstanding the provisions of directed at locations where the great- §§ 75.1107–1 through 75.1107–12 the Dis- est potential fire hazard exists. Cable trict Manager for the District in which reel compartments shall receive ap- the mine is located may approve any proximately twice the quantity of ex- other fire suppression system or device tinguishing agent as each other haz- which provides substantially equiva- ardous location. lent protection as would be achieved (j) The rate of application of the fire through compliance with those sec- suppression agent shall minimize the tions: Provided, That no such system or time for quenching and the total quan- device shall be approved which does not tity applied shall be sufficient to meet the following minimum criteria: quench a fire in its incipient stage. (a) Components shall be approved by (k) The effectiveness of the quench- the Secretary, or where appropriate be ing agent, together with the total listed as approved by a nationally rec- quantity of agent and its rate of appli- ognized agency approved by the Sec- cation shall provide equivalent protec- retary. tion to the water, dry powder, or foam

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systems described in §§ 75.1107–7, braid hose shall have at least two 75.1107–9, and 75.1107–10. braids, and wire braid hose shall have (l) The fire suppression device shall at least a single braid. be operable at all times electrical (7) In addition to the hose located at power is connected to the mining ma- the hydrant (which is intended to be chine, except during tramming when connected to the hose on the machine) the machine is in a ventilated passage- the firefighting equipment required by way, the water hose if used, may be § 75.1100–2(a) shall be maintained. switched from one hydrant to another (8) A sufficient number of trained in a reasonable time and except in sys- miners shall be kept on the section tems meeting the minimum special cri- when the machine is in use to connect teria set forth in paragraph (m) of this the machine hose to the hydrant hose section. and achieve water flow in not more (m) Systems for attended equipment than 3 minutes. which are not continuously connected to a water supply shall not be approved [37 FR 15303, July 29, 1972] unless they meet the following min- § 75.1107–14 Guards and handrails; re- imum criteria: quirements where fire suppression (1) The machine shall be equipped devices are employed. with a firehose at least 50 feet in length which is continuously connected All unattended underground equip- to the machine-mounted portion of the ment provided with fire suppression de- system. vices which are mounted in dead end (2) Hydrants in proximity to the area entries, enclosed rooms or other poten- where the machine is to be used shall tially hazardous locations shall be be equipped with sufficient hose to equipped with adequate guards at mov- reach the machine at any time it is ing or rotating components. Handrails connected to a power source. or other effective protective devices (3) The machine shall be used only shall be installed at such locations where the operator (or other person) where necessary to facilitate rapid will always be in ventilated air egress from the area surrounding such uncontaminated by smoke and hot equipment. gases from the machine fire while ex- [37 FR 15303, July 29, 1972] tending the machine-mounted hose to connect with the hydrant-mounted § 75.1107–15 Fire suppression devices; hose. hazards; training of miners. (4) The machine and hydrant hoses Each operator shall instruct all min- shall be readily accessible so that the ers normally assigned to the active connection between the machine- workings of the mine with respect to mounted hose and the hydrant hose any hazards inherent in the operation can be made and water flow achieved in of all fire suppression devices installed not more than 3 minutes under actual in accordance with § 75.1107–1 and, mining conditions for any location of where appropriate, the safeguards the machine while electric power is available at each such installation. connected. (5) The rate of water flow at the ma- [37 FR 15303, July 29, 1972] chine shall provide a minimum of 0.12 gallon of water per minute per square § 75.1107–16 Inspection of fire suppres- foot of top surface area (excluding con- sion devices. veyors, cutters, and gathering heads). (a) All fire suppression devices shall The water shall discharge to all haz- be visually inspected at least once each ardous locations on the machine. week by a person qualified to make (6) Hose, if used on the machine, in such inspections. addition to meeting the flame resistant (b) Each fire suppression device shall requirements for the cover of a hose be tested and maintained in accordance provided in §§ 75.1107–3(b) and 75.1107– with the requirements specified in the 13(c) shall have a minimum burst pres- appropriate National Fire Code listed sure 4 times that of the static water as follows for the type and kind of de- pressure at the mining machine. Fabric vice used:

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National Fire Code No. 11A ‘‘High Expansion coal mines shall be approved under Foam Systems’’ (NFPA No. 11A—1970). Part 14. National Fire Code No. 13A ‘‘Care and Main- tenance of Sprinkler Systems’’ (NFPA No. [73 FR 80616, Dec. 31, 2008] 13A—1971). National Fire Code No. 15 ‘‘Water Spray Fixed Systems for Fire Protection’’ (NFPA Subpart M—Maps No. 15—1969). National Fire Code No. 17 ‘‘Dry Chemical Ex- § 75.1200 Mine map. tinguishing Systems’’ (NFPA No. 17—1969). National Fire Code No. 72A ‘‘Local Protec- [STATUTORY PROVISIONS] tive Signaling Systems’’ (NFPA No. 72A— 1967). The operator of a coal mine shall National Fire Code No. 198 ‘‘Care of Fire have in a fireproof repository located Hose’’ (NFPA No. 198—1969). in an area on the surface of the mine chosen by the mine operator to mini- (c) A record of the inspections re- mize the danger of destruction by fire quired by this section shall be main- or other hazard, an accurate and up-to- tained by the operator. The record of date map of such mine drawn on scale. the weekly inspections may be maintained at an appropriate location by Such map shall show: each fire suppression device. (a) The active workings; (b) All pillared, worked out, and [37 FR 15304, July 29, 1972, as amended at 60 abandoned areas, except as provided in FR 33723, June 29, 1995] this section; § 75.1107–17 Incorporation by ref- (c) Entries and aircourses with the erence; availability of publications. direction of airflow indicated by ar- rows; In accordance with 5 U.S.C. 552(a), the technical publications to which ref- (d) Contour lines of all elevations; erence is made in §§ 75.1107–1 through (e) Elevations of all main and cross 75.1107–16, and which have been pre- or side entries; pared by organizations other than the (f) Dip of the coalbed; Bureau of Mines or the Mine Safety (g) Escapeways; and Health Administration, are hereby (h) Adjacent mine workings within incorporated by reference and made a 1,000 feet; part hereof. The incorporated publica- (i) Mines above or below; tions are available for examination at (j) Water pools above; and each MSHA Coal Mine Safety and (k) Either producing or abandoned oil Health district office. National Fire and gas wells located within 500 feet of Codes are available from the National such mine and any underground area of Fire Protection Association, 11 Tracy such mine; and, Drive, Avon, MA 02322; Telephone: 800– (l) Such other information as the 344–3555 (toll free); http://www.nfpa.org. Secretary may require. Such map shall identify those areas of the mine which [37 FR 15304, July 29, 1972, as amended at 71 FR 16669, Apr. 3, 2006] have been pillared, worked out, or abandoned, which are inaccessible or § 75.1108 Approved conveyor belts. cannot be entered safely and on which (a) Until December 31, 2009 conveyor no information is available. belts placed in service in underground § 75.1200–1 Additional information on coal mines shall be: mine map. (1) Approved under Part 14; or (2) Accepted under Part 18. Additional information required to (b) Effective December 31, 2009 con- be shown on mine maps under § 75.1200 veyor belts placed in service in under- shall include the following: ground coal mines shall be approved (a) Name and address of the mine; under Part 14. If MSHA determines (b) The scale and orientation of the that Part 14 approved belt is not avail- map; able, the Agency will consider an ex- (c) The property or boundary lines of tension of the effective date. the mine; (c) Effective December 31, 2018 all (d) All drill holes that penetrate the conveyor belts used in underground coalbed being mined;

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(e) All shaft, slope, drift, and tunnel (n) The locations of refuge alter- openings and auger and strip mined natives. areas of the coalbed being mined; [35 FR 17890, Nov. 20, 1970, as amended at 73 (f) The location of all surface mine FR 80697, Dec. 31, 2008] ventilation fans; the location may be designated on the mine map by sym- § 75.1200–2 Accuracy and scale of mine bols; maps. (g) The location of railroad tracks (a) The scale of mine maps submitted and public highways leading to the to the Secretary shall not be less than mine, and mine buildings of a perma- 100 or more than 500 feet to the inch. nent nature with identifying names (b) Mine traverses shall be advanced shown; by closed loop methods of traversing or (h) The location and description of at other equally accurate methods of tra- least two permanent base line points versing. coordinated with the underground and surface mine traverses, and the loca- § 75.1201 Certification. tion and description of at least two permanent elevation bench marks used [STATUTORY PROVISIONS] in connection with establishing or ref- Such map shall be made or certified erencing mine elevation surveys; by a registered engineer or a registered (i) The location of any body of water surveyor of the State in which the dammed in the mine or held back in mine is located. any portion of the mine; provided, however, such bodies of water may be § 75.1202 Temporary notations, revi- shown on overlays or tracings attached sions, and supplements. to the mine maps used to show contour lines as provided under paragraph (m) [STATUTORY PROVISIONS] of this section; Such map shall be kept up-to-date by (j) The elevations of tops and bot- temporary notations and such map toms of shafts and slopes, and the floor shall be revised and supplemented at at the entrance to drift and tunnel intervals prescribed by the Secretary openings; on the basis of a survey made or cer- (k) The elevation of the floor at in- tified by such engineer or surveyor. tervals of not more than 200 feet in: (1) At least one entry of each work- § 75.1202–1 Temporary notations, revi- ing section, and main and cross entries; sions, and supplements. (2) The last line of open crosscuts of (a) Mine maps shall be revised and each working section, and main and supplemented at intervals of not more cross entries before such sections and than 6 months. main and cross entries are abandoned; (b) Temporary notations shall in- (3) Rooms advancing toward or adja- clude: cent to property or boundary lines or (1) The location of each working face adjacent mines; of each working place; (l) The elevation of any body of water (2) Pillars mined or other such second dammed in the mine or held back in mining; any portion of the mine; and, (3) Permanent ventilation controls (m) Contour lines passing through constructed or removed, such as seals, whole number elevations of the coalbed overcasts, undercasts, regulators, and being mined. The spacing of such lines permanent stoppings, and the direction shall not exceed 10-foot elevation lev- of air currents indicated; els, except that a broader spacing of (4) Escapeways and refuge alter- contour lines may be approved by the natives designated by means of sym- District Manager for steeply-pitching bols. coalbeds. Contour lines may be placed on overlays or tracings attached to [35 FR 17890, Nov. 20, 1970, as amended at 73 mine maps. FR 80697, Dec. 31, 2008]

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§ 75.1203 Availability of mine map. the Coal Mine Safety and Health Dis- trict Office for the district in which the [STATUTORY PROVISIONS] mine is located. The coal mine map and any revision [35 FR 17890, Nov. 20, 1970, as amended at 60 and supplement thereof shall be avail- FR 33723, June 29, 1995; 71 FR 16669, Apr. 3, able for inspection by the Secretary or 2006] his authorized representative, by coal mine inspectors of the State in which Subpart N—Explosives and the mine is located, by miners in the Blasting mine and their representatives and by operators of adjacent coal mines and SOURCE: 53 FR 46786, Nov. 18, 1988, unless by persons owning, leasing, or residing otherwise noted. on surface areas of such mines or areas adjacent to such mines. The operator § 75.1300 Definitions. shall furnish to the Secretary or his The following definitions apply in authorized representative and to the this subpart. Secretary of Housing and Urban Devel- Approval. A document issued by opment, upon request, one or more cop- MSHA which states that an explosive ies of such maps and any revision and or explosive unit has met the require- supplement thereof. Such map or revi- ments of this part and which author- sion and supplement thereof shall be izes an approval marking identifying kept confidential and its contents shall the explosive or explosive unit as ap- not be divulged to any other person, proved as permissible. except to the extent necessary to carry Battery starting. The use of out the provisions of this Act and in unconfined explosives to start the flow connection with the functions and re- of coal down a breast or chute in an an- sponsibilities of the Secretary of Hous- thracite mine. ing and Urban Development. Blasting off the solid. Blasting the working face without providing a sec- § 75.1204 Mine closure; filing of map ond free face by cutting, shearing or with Secretary. other method before blasting. Instantaneous detonator. An electric [STATUTORY PROVISIONS] detonator that fires within 6 milli- Whenever an operator permanently seconds after application of the firing closes or abandons a coal mine, or tem- current. porarily closes a coal mine for a period Laminated partition. A partition com- of more than 90 days, he shall promptly posed of the following material and notify the Secretary of such closure. minimum nominal dimensions: 1⁄2-inch 1 Within 60 days of the permanent clo- thick plywood, ⁄2-inch thick gypsum 1 sure or abandonment of the mine, or, wall board, ⁄8-inch thick low carbon 1 when the mine is temporarily closed, steel and ⁄4-inch thick plywood, bonded upon the expiration of a period of 90 together in that order. days from the date of closure, the oper- Opener hole. The first hole or holes ator shall file with the Secretary a fired in a round blasted off the solid to copy of the mine map revised and sup- create an additional free face. plemented to the date of the closure. Permissible blasting unit. A device that Such copy of the mine map shall be has been approved by MSHA and that is used for firing electric detonators. certified by a registered surveyor or Permissible explosive. Any substance, registered engineer of the State in compound or mixture which is ap- which the mine is located and shall be proved by MSHA and whose primary available for public inspection. purpose is to function by explosion. [35 FR 17890, Nov. 20, 1970, as amended at 60 Round. A group of boreholes fired or FR 33723, June 29, 1995] intended to be fired in a continuous sequence with one application of the fir- § 75.1204–1 Places to give notice and ing current. file maps. Sheathed explosive unit. A device con- Operators shall give notice of mine sisting of an approved or permissible closures and file copies of maps with explosive covered by a sheath encased

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in a sealed covering and designed to be detonators and long period delay deto- fired outside the confines of a borehole. nators for anthracite mines. Short-delay electric detonator. An elec- (d) Permissible explosives and tric detonator with a designated delay sheathed explosive units shall not be period of 25 to 1,000 milliseconds. used underground when they are below the minimum product firing tempera- § 75.1301 Qualified person. ture specified by the approval. Explo- (a) A qualified person under this sub- sives previously approved which do not part is a person who— specify a minimum firing temperature (1) Is certified or qualified to use ex- are permissible for use so long as the plosives by the State in which the mine present approval is maintained. is located provided that the State re- (e) Electric detonators shall be com- quires a demonstration of ability to patible with the blasting unit and have safely use permissible explosives as sufficient strength to initiate the ex- prescribed by this subpart effective plosives being used. January 17, 1989; or (2) In States that do not certify or § 75.1311 Transporting explosives and qualify persons to use explosives re- detonators. quired by this section, has at least 1 (a) When explosives and detonators year of experience working in an un- are to be transported underground— derground coal mine that includes di- (1) They shall be enclosed in sepa- rect involvement with procedures for rate, substantially constructed con- handling, loading, and preparing explo- tainers made of nonconductive mate- sives for blasting and demonstrates to rial, with no metal or other conductive an authorized representative of the materials exposed inside, except as Secretary the ability to use permis- specified in paragraph (d) of this sec- sible explosives safely. tion; and (b) Persons qualified or certified by a (2) Each container of explosives and State to use permissible explosives in of detonators shall be indelibly marked underground coal mines as of May 17, with a readily visible warning identi- 1989, are considered qualified under this fying the contents. section even though their State pro- (b) When explosives and detonators gram did not contain a demonstration are transported by any cars or vehi- of ability requirement. cles— [35 FR 17890, Nov. 20, 1970, as amended at 56 (1) The cars or vehicles shall be FR 51616, Oct. 11, 1991; 60 FR 33723, June 29, marked with warnings to identify the 1995] contents as explosive. The warnings shall be readily visible to miners ap- § 75.1310 Explosives and blasting proaching from any direction and in in- equipment. delible letters; (a) Only permissible explosives, ap- (2) Explosives and detonators shall be proved sheathed explosive units, and transported either in separate cars or permissible blasting units shall be vehicles, or if in the same cars or vehi- taken or used underground. cles as follows: (b) Black blasting powder, alu- (i) Class A and Class C detonators in minum-cased detonators, aluminum- quantities greater than 1,000 shall be alloy-cased detonators, detonators kept in the original containers as with aluminum leg wires, and safety shipped from the manufacturer and fuses shall not be taken or used under- separated from explosives by a hard- ground. wood partition at least 4 inches thick, (c) Explosives shall be fired only with a laminated partition or equivalent; a permissible blasting unit used in a and manner consistent with its approval. (ii) Class A and Class C detonators in Blasting units approved by MSHA that quantities of no more than 1,000 shall have approval labels specifying use be separated from explosives by a hard- with short-delay detonators with delay wood partition at least 4 inches thick, periods between 25–500 milliseconds are a laminated partition or equivalent. accepted to fire short-delay detonators (3) No persons, other than those nec- up to 1,000 milliseconds, instantaneous essary to operate the equipment or to

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accompany the explosives and deto- (d) Magazines shall be substantially nators, shall be transported with explo- constructed and all interior surfaces sives and detonators, and shall be made of nonconductive mate- (4) When explosives and detonators rial, with no metal or other conductive are transported using trolley loco- material exposed inside. motives— (e) All magazines shall be— (i) Trips carrying explosives and det- (1) Located at least 25 feet from road- onators shall be separated from all ways and any source of electric cur- other mantrips by at least a 5-minute rent; interval; and (2) Located out of the direct line of (ii) Cars containing explosives or det- the forces from blasting; and onators shall be separated from the lo- (3) Kept as dry as practicable. comotives by at least one car that is (f) Magazine locations shall be posted empty or that contains noncombustible with indelibly marked and readily visi- materials. ble warnings indicating the presence of (c) When explosives and detonators explosives. are transported on conveyor belts— (g) Only materials and equipment to (1) Containers of explosives shall be be used in blasting shall be stored at separated from containers of deto- magazine locations. nators by at least 50 feet; § 75.1313 Explosives and detonators (2) At least 6 inches of clearance shall outside of magazines. be maintained between the top of any container of explosives or container of (a) The quantity of explosives outside detonators and the mine roof or other a magazine for use in a working section obstruction; or other area where blasting is to be performed shall— (3) Except when persons are riding (1) Not exceed 100 pounds; or the belt to accompany explosives or (2) Not exceed the amount necessary detonators, a person shall be at each to blast one round when more than 100 transfer point between belts and at the pounds of explosives is required. unloading location; and (b) Explosives and detonators outside (4) Conveyor belts shall be stopped a magazine that are not being trans- before explosives or detonators are ported or prepared for loading loaded or unloaded. boreholes shall be kept in closed sepa- (d) When explosives and detonators rate containers made of nonconductive are transported by hand they shall be material with no metal or other con- carried in separate, nonconductive, ductive material exposed inside and closed containers. the containers shall be— (1) At least 15 feet from any source of § 75.1312 Explosives and detonators in underground magazines. electric current; (2) Out of the direct line of the forces (a) The quantity of explosives kept from blasting; underground shall not be more than is (3) In a location to prevent damage needed for 48 hours of use. by mobile equipment; and (b) Except as provided in § 75.1313, ex- (4) Kept as dry as practicable. plosives and detonators taken under- (c) Explosives and detonators not ground shall be kept in— used during the shift shall be returned (1) Separate, closed magazines at to a magazine by the end of the shift. least 5 feet apart; or (2) The same closed magazine when— § 75.1314 Sheathed explosive units. (i) Separated by a hardwood partition (a) A separate instantaneous deto- at least 4 inches thick; or nator shall be used to fire each (ii) Separated by a laminated parti- sheathed explosive unit. tion; or (b) Sheathed explosive units shall be (iii) Separated by a device that is primed and placed in position for firing equivalent. only by a qualified person or a person (c) Only explosives and detonators working in the presence of and under shall be kept in underground maga- the direction of a qualified person. To zines. prime a sheathed explosive unit, the

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entire detonator shall be inserted into be placed and fired shall be deenergized the detonator well of the unit and be or removed to at least 50 feet from held securely in place. these locations before priming of explo- (c) Sheathed explosive units shall not sives. Battery-powered equipment shall be primed until immediately before the be removed to at least 50 feet from units are placed where they are to be these locations before priming of explo- fired. A sheathed explosive unit shall sives. not be primed if it is damaged or dete- (2) As an alternative to paragraph riorated. (a)(1) of this section, electric equip- (d) Except in anthracite mines, rock ment, including cables, need not be de- dust shall be applied to the roof, ribs energized or removed if located at least and floor within a 40–foot radius of the 25 feet from these locations provided location where the sheathed explosive stray current tests conducted prior to units are to be fired. priming the explosives detect stray (e) No more than three sheathed ex- currents of 0.05 ampere or less through plosive units shall be fired at one time. a 1-ohm resistor. (f) No sheathed explosive unit shall (i) Tests shall be made at floor loca- be fired in contact with another tions on the perimeter, on energized sheathed explosive unit. equipment frames and on repaired areas of energized cables within the § 75.1315 Boreholes for explosives. area between 25 to 50 feet from the lo- (a) All explosives fired underground cations where the explosives are to be shall be confined in boreholes except— primed. (1) Sheathed explosives units and (ii) Tests shall be conducted using a other explosive units approved by blasting multimeter or other instru- MSHA for firing outside the confines of ment specifically designed for such use. a borehole; and (3) The blasting cable or detonator (2) Shots fired in anthracite mines circuitry shall not come in contact for battery starting or for blasting coal with energized electric equipment, in- overhangs. No person shall go inside a cluding cables. battery to start the flow of material. (b) Before loading boreholes with ex- (b) Each borehole in coal for explo- plosives, each borehole shall be cleared sives shall be at least 24 inches from and its depth and direction determined. any other borehole and from any free (c) No borehole drilled beyond the face, unless prohibited by the thickness depth of cut coal shall be loaded with of the coal seam. explosives unless that portion of the (c) Each borehole in rock for explo- borehole deeper than the cut is tamped sives shall be at least 18 inches from with noncombustible material. any other borehole in rock, at least 24 (d) When two working faces are ap- inches from any other borehole in coal, proaching each other, cutting, drilling and at least 18 inches from any free and blasting shall be done at only one face. working face at a time if the two faces (d) No borehole that has contained are within 25 feet of each other. explosives shall be used for starting any other hole. [35 FR 17890, Nov. 20, 1970, as amended at 56 (e) When blasting slab rounds off the FR 51616, Oct. 11, 1991] solid, opener holes shall not be drilled beyond the rib line. § 75.1317 Primer cartridges. (f) When coal is cut for blasting, the (a) Primer cartridges shall be primed coal shall be supported if necessary to and loaded only by a qualified person maintain the stability of the column of or a person working in the presence of explosives in each borehole. and under the direction of a qualified person. § 75.1316 Preparation before blasting. (b) Primer cartridges shall not be (a)(1) All nonbattery-powered electric primed until immediately before load- equipment, including cables, located ing boreholes. within 50 feet from boreholes to be (c) Only a nonsparking punch shall be loaded with explosives or the sites used when priming explosive car- where sheathed explosive units are to tridges.

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(d) Detonators shall be completely § 75.1319 Weight of explosives per- within and parallel to the length of the mitted in boreholes in bituminous cartridge and shall be secured by half- and lignite mines. hitching the leg wires around the car- (a) The total weight of explosives tridge or secured by an equally effec- loaded in any borehole in bituminous tive method. and lignite mines shall not exceed 3 pounds except when blasting solid rock § 75.1318 Loading boreholes. in its natural deposit. (a) Explosives shall be loaded by a (b) The total weight of explosives qualified person or a person working in loaded in a borehole less than 6 feet the presence of and under the direction deep in bituminous and lignite mines 1 of a qualified person. shall be reduced by ⁄2 pound for each foot of borehole less than 6 feet. (b) When boreholes are being loaded, no other work except that necessary to § 75.1320 Multiple-shot blasting. protect persons shall be done in the (a) No more than 20 boreholes shall working place or other area where be fired in a round unless permitted in blasting is to be performed. writing by the District Manager under (c) When loading boreholes drilled at § 75.1321. an angle of 45 degrees or greater from (b) Instantaneous detonators shall the horizontal in solid rock or loading not be used in the same circuit with long holes drilled upward in anthracite delay detonators in any underground mines— coal mine. (1) The first cartridge in each bore- (c) In bituminous and lignite mines, hole shall be the primer cartridge with only detonators with delay periods of the end of the cartridge containing the 1,000 milliseconds or less shall be used. detonator facing the back of the bore- (d) When blasting in anthracite hole; and mines, each borehole in a round shall (2) The explosive cartridges shall be be initiated in sequence from the open- loaded in a manner that provides con- er hole or holes. tact between each cartridge in the (e) Arrangement of detonator delay borehole. periods for bituminous and lignite (d) When loading other boreholes— mines shall be as follows: (1) The primer cartridge shall be the (1) When blasting cut coal— (i) The first shot or shots fired in a first cartridge loaded in the borehole; round shall be initiated in the row (2) The end of the cartridge in which nearest the kerf or the row or rows the detonator is inserted shall face the nearest the shear; and back of the borehole; and (ii) After the first shot or shots, the (3) The primer cartridge and other interval between the designated delay explosives shall be pushed to the back periods of successive shots shall be at of the borehole in a continuous column least 50 milliseconds but not more than with no cartridge being deliberately 100 milliseconds. crushed or deformed. (2) When blasting coal off the solid— (e) An explosive shall not be loaded (i) Each shot in the round shall be into a borehole if it is damaged, dete- initiated in sequence from the opener riorated or if the cartridge is incom- hole or holes; and pletely filled. (ii) After the first shot or shots, the (f) Explosives of different brands, interval between the designated delay types or cartridge diameters shall not periods of successive shots shall be at be loaded in the same borehole. least 50 milliseconds but not more than (g) Only nonconductive, nonsparking 100 milliseconds. tamping poles shall be used for loading § 75.1321 Permits for firing more than and tamping boreholes. The use of non- 20 boreholes and for use of nonsparking connecting devices for ex- permissible blasting units. tendable tamping poles is permitted. (a) Applications for permits for firing [53 FR 46786, Nov. 18, 1988; 54 FR 888, Jan. 10, more than 20 boreholes in a round and 1989] for the use of nonpermissible blasting

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units shall be submitted in writing to boreholes during earlier blasting oper- the District Manager for the district in ations; or which the mine is located and shall (4) Any other hazard created by the contain the following information: use of permissible blasting units during (1) The name and address of the mine; underground development or construc- (2) The active workings in the mine tion. affected by the permit and the approxi- (c) Permits shall be issued on a mine- mate number of boreholes to be fired; by-mine basis for periods of time to be (3) The period of time during which specified by the District Manager. the permit will apply; (d) Permits issued under this section (4) The nature of the development or shall specify and include as a condition construction for which they will be of their use, any safeguards, in addi- used, e.g., overcasts, undercasts, track tion to those proposed by the operator, grading, roof brushing or boom holes; which the District Manager issuing (5) A plan, proposed by the operator such permit has determined will be re- designed to protect miners in the mine quired to ensure the welfare of the from the hazards of methane and other miners employed in the mine at the explosive gases during each multiple time of the blasting permitted. shot, e.g., changes in the mine ventilation system, provisions for auxiliary [35 FR 17890, Nov. 20, 1970, as amended at 60 FR 33723, June 29, 1995] ventilation and any other safeguards necessary to minimize such hazards; § 75.1322 Stemming boreholes. (6) A statement of the specific hazards anticipated by the operator in (a) Only noncombustible material blasting for overcasts, undercasts, shall be used for stemming boreholes. track grading, brushing of roof, boom (b) Stemming materials other than holes or other unusual blasting situa- water stemming bags shall be tamped tions such as coalbeds of abnormal to fill the entire cross sectional area of thickness; and the borehole. (7) The method to be employed to (c) Stemming material shall contact avoid the dangers anticipated during the explosive cartridge nearest the col- development or construction which lar of the borehole. will ensure the protection of life and (d) Each borehole 4 or more feet deep the prevention of injuries to the miners shall be stemmed for at least 24 inches. exposed to such underground blasting. (e) Each borehole less than 4 feet (b) The District Manager may permit deep shall be stemmed for at least half the firing of more than 20 boreholes of the depth of the borehole. permissible explosives in a round where (f) When blasting off the solid in bitu- he has determined that it is necessary minous and lignite mines, only pliable to reduce the overall hazard to which clay dummies shall be used for stem- miners are exposed during underground ming. blasting. He may also permit the use of (g) The diameter of a water stem- nonpermissible blasting units if he ming bag shall be within 1⁄4 of an inch finds that a permissible blasting unit of the diameter of the drill bit used to does not have adequate blasting capac- drill the borehole. ity and that the use of such permissible (h) Water stemming bags shall be units will create any of the following constructed of tear-resistant and development or construction hazards: flame-resistant material and be capa- (1) Exposure to disturbed roof in an ble of withstanding a 3-foot drop when adjacent cavity while scaling and sup- filled without rupturing or developing porting the remaining roof prior to leaks. wiring a new series of boreholes; (2) Exposure to underburden § 75.1323 Blasting circuits. boreholes where prior rounds have re- (a) Blasting circuits shall be pro- moved the burden adjacent to a re- tected from sources of stray electric maining borehole; current. (3) Exposure to an unsupported roof (b) Detonators made by different while redrilling large fragmented roof manufacturers shall not be combined rock following the loss of predrilled in the same blasting circuit.

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(c) Detonator leg wires shall be ence of and under the direction of a shunted until connected into the blast- qualified person. ing circuit. (b) Only one face in a working place (d) Blasting cables shall be— shall be blasted at a time, except that (1) Well insulated, copper wire of a when blasting cut coal up to three diameter not smaller than 18-gauge; faces may be blasted in a round if each and face has a separate kerf and no more (2) Long enough to permit the round than a total of 20 shots connected in a to be fired from a safe location that is single series are fired in the round. A around at least one corner from the permit to fire more than 20 boreholes blasting area. in a round under the provisions of 30 (e) Blasting cables shall be shunted CFR 75.1320 and 75.1321 may not be ob- until immediately before firing, except tained for use when blasting multiple when testing for circuit continuity. faces. (f) Wire used between the blasting (c) Before blasting— cable and detonator circuitry shall— (1) All persons shall leave the blast- (1) Be undamaged; ing area and each immediately adja- (2) Be well insulated; cent working place where a hazard (3) Have a resistance no greater than would be created by the blast, to an 20-gauge copper wire; and area that is around at least one corner (4) Be not more than 30 feet long. from the blasting area; (g) Each wire connection in a blast- (2) The qualified person shall ascer- ing circuit shall be— tain that all persons are a safe distance (1) Properly spliced; and from the blasting area; and (2) Separated from other connections (3) A warning shall be given and ade- in the circuit to prevent accidental quate time allowed for persons to re- contact and arcing. spond. (h) Uninsulated connections in each (d) All shots shall be fired promptly, blasting circuit shall be kept out of after all persons have been removed to water and shall not contact the coal, a safe location. roof, ribs, or floor. [35 FR 17890, Nov. 20, 1970, as amended at 56 (i) When 20 or fewer boreholes are FR 51616, Oct. 11, 1991] fired in a round, the blasting circuit shall be wired in a single series. § 75.1326 Examination after blasting. (j) Immediately prior to firing, all (a) After blasting, the blasting area blasting circuits shall be tested for shall not be entered until it is clear of continuity and resistance using a smoke and dust. blasting galvanometer or other instru- (b) Immediately after the blasting ment specifically designed for testing area has cleared, a qualified person or blasting circuits. a person working in the presence of and [53 FR 46786, Nov. 18, 1988; 54 FR 27641, June under the direction of a qualified per- 30, 1989] son, shall examine the area for misfires, methane and other hazardous § 75.1324 Methane concentration and conditions. tests. (c) If a round has partially detonated, (a) No shot shall be fired in an area the qualified person shall immediately that contains 1.0 volume percent or leave the area and no person shall reen- more of methane. ter the affected area for at least 5 min- (b) Immediately before shots are utes. fired, the methane concentration in a working place or any other area where § 75.1327 Misfires. blasting is to be performed, shall be de- (a) When misfires occur, only work termined by a person qualified to test by a qualified person to dispose of mis- for methane. fires and other work necessary to protect persons shall be done in the af- § 75.1325 Firing procedures. fected area. (a) Shots shall be fired by a qualified (b) When a misfire cannot be disposed person or a person working in the pres- of—

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(1) A qualified person shall post each quired for automatically operated accessible entrance to the area affected cages, platforms, or elevators. by the hazard of the misfire with a [48 FR 53239, Nov. 25, 1983] warning at a conspicuous location to prohibit entry; and § 75.1400–1 Hoists; brakes, capability. (2) The misfire shall be immediately Brakes on hoists used to transport reported to mine management. persons shall be capable of stopping [53 FR 46786, Nov. 18, 1988; 54 FR 27641, June and holding the fully loaded platform, 30, 1989] cage, or other device at any point in the shaft, slope, or incline. § 75.1328 Damaged or deteriorated explosives and detonators. § 75.1400–2 Hoists; tests of safety catches; records. (a) Damaged explosives or detonators shall be— A record shall be made in a book of the tests, required by § 75.1400, of the (1) Placed in separate containers con- safety catches or other devices ap- structed of nonconductive and non- proved by the Secretary. Each entry sparking materials; and shall be signed by the person making (2) Removed from the mine or placed the tests and countersigned by a re- in a magazine and removed when the sponsible official. magazine is resupplied. (b) Damaged detonators shall be § 75.1400–3 Daily examination of hoist- shunted, if practicable, either before ing equipment. being removed from the mine or placed Hoists and elevators shall be exam- in a magazine. ined daily and such examinations shall (c) Deteriorated explosives and deto- include, but not be limited to, the fol- nators shall be handled and disposed of lowing: in accordance with the instructions of (a) Elevators. A visual examination of the manufacturer. the rope for wear, broken wires, and corrosion, especially at excessive Subpart O—Hoisting and Mantrips strain points such as near the attachments and where the rope rests on § 75.1400 Hoisting equipment; general. sheaves; (b) Hoists and elevators. (1) An exam- (a) Every hoist used to transport per- ination of the rope fastenings for de- sons shall be equipped with overspeed, fects; overwind, and automatic stop controls. (2) An examination of safety catches; (b) Every hoist handling a platform, (3) An examination of the cages, plat- cage, or other device used to transport forms, elevators, or other devices for persons shall be equipped with brakes loose, missing or defective parts; capable of stopping the fully loaded (4) An examination of the head platform, cage, or other device. sheaves to check for broken flanges, (c) Cages, platforms, or other devices defective bearings, rope alignment, and used to transport persons in shafts and proper lubrication; and slopes shall be equipped with safety (5) An observation of the lining and catches or other no less effective de- all other equipment and appurtenances vices approved by the Secretary that installed in the shaft. act quickly and effectively in an emer- [48 FR 53239, Nov. 25, 1983] gency. Such catches or devices shall be tested at least once every two months. § 75.1400–4 Certifications and records (d) Hoisting equipment, including of daily examinations. automatic elevators, used to transport At the completion of each daily ex- persons shall be examined daily. amination required by § 75.1400, the per- (e) Where persons are transported son making the examination shall cer- into or out of a mine by a hoist, a tify, by signature and date, that the qualified hoisting engineer shall be on examination has been made. If any un- duty while any person is underground. safe condition is found during the ex- No such engineer, however, shall be re- aminations required by § 75.1400–3, the

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person conducting the examination § 75.1403–1 General criteria. shall make a record of the condition (a) Sections 75.1403–2 through 75.1403– and the date. Certifications and records 11 set out the criteria by which an au- shall be retained for one year. thorized representative of the Sec- [48 FR 53239, Nov. 25, 1983, as amended at 60 retary will be guided in requiring other FR 33723, June 29, 1995] safeguards on a mine-by-mine basis under § 75.1403. Other safeguards may § 75.1401 Hoists; rated capacities; indi- be required. cators. (b) The authorized representative of the Secretary shall in writing advise Hoists shall have rated capacities the operator of a specific safeguard consistent with the loads handled. An which is required pursuant to § 75.1403 accurate and reliable indicator of the and shall fix a time in which the oper- position of the cage, platform, skip, ator shall provide and thereafter main- bucket, or cars shall be provided. tain such safeguard. If the safeguard is [48 FR 53239, Nov. 25, 1983] not provided within the time fixed and if it is not maintained thereafter, a no- § 75.1401–1 Hoists; indicators. tice shall be issued to the operator pursuant to section 104 of the Act. The indicator required by § 75.1401 of (c) Nothing in the sections in the this subpart shall be placed so that it § 75.1403 series in this Subpart O pre- is in clear view of the hoisting engineer cludes the issuance of a withdrawal and shall be checked daily to deter- order because of imminent danger. mine its accuracy. § 75.1403–2 Criteria—Hoists trans- [48 FR 53239, Nov. 25, 1983] porting materials; brakes. § 75.1402 Communication between Hoists and elevators used to trans- shaft stations and hoist room. port materials should be equipped with brakes capable of stopping and holding [STATUTORY PROVISIONS] the fully loaded platform, cage, skip, car, or other device at any point in the There shall be at least two effective shaft, slope, or incline. methods approved by the Secretary of signaling between each of the shaft sta- § 75.1403–3 Criteria—Drum clutch; tions and the hoist room, one of which cage construction. shall be a telephone or speaking tube. (a) The clutch of a free-drum on a personnel hoist should be provided with § 75.1402–1 Communication between a locking mechanism or interlocked shaft stations and hoist room. with the brake to prevent accidental One of the methods used to commu- withdrawal of the clutch. nicate between shaft stations and the (b) Cages used for hoisting persons hoist room shall give signals which can should be constructed with the sides be heard by the hoisting engineer at all enclosed to a height of at least six feet times while men are underground. and should have gates, safety chains, or bars across the ends of the cage § 75.1402–2 Tests of signaling systems. when persons are being hoisted or low- Signaling systems used for commu- ered. (c) Self-dumping cages, platforms, or nication between shaft stations and the other devices used for transportation of hoist room shall be tested daily. persons should have a locking device to § 75.1403 Other safeguards. prevent tilting when persons are transported. [STATUTORY PROVISIONS] (d) An attendant should be on duty at the surface when persons are being Other safeguards adequate, in the hoisted or lowered at the beginning and judgment of an authorized representa- end of each shift. tive of the Secretary, to minimize haz- (e) Precautions should be taken to ards with respect to transportation of protect persons working in shaft men and materials shall be provided. sumps.

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(f) Workers should wear safety belts be installed at all loading and unload- while doing work in or over shafts. ing stations. Such colored lights and reflective signs should be so located as [48 FR 53239, Nov. 25, 1983] to be observable to all persons riding § 75.1403–4 Criteria—Automatic ele- the belt conveyor. vators. (f) After supplies have been trans- (a) The doors of automatic elevators ported on belt conveyors such belts should be equipped with interlocking should be examined for unsafe condi- switches so arranged that the elevator tions prior to the transportation of car will be immovable while any door men on regularly scheduled mantrips, is opened or unlocked, and arranged so and belt conveyors should be clear be- that such door or doors cannot be inad- fore men are transported. vertently opened when the elevator car (g) A clear travelway at least 24 is not at a landing. inches wide should be provided on both (b) A ‘‘Stop’’ switch should be pro- sides of all belt conveyors installed vided in the automatic elevator com- after March 30, 1970. Where roof sup- partment that will permit the elevator ports are installed within 24 inches of a to be stopped at any location in the belt conveyor, a clear travelway at shaft. least 24 inches wide should be provided (c) A slack cable device should be on the side of such support farthest used where appropriate on automatic from the conveyor. elevators which will automatically (h) On belt conveyors that do not shut-off the power and apply the transport men, stop and start controls brakes in the event the elevator is ob- should be installed at intervals not to structed while descending. exceed 1,000 feet. Such controls should (d) Each automatic elevator should be properly installed and positioned so be provided with a telephone or other as to be readily accessible. effective communication system by (i) Telephone or other suitable com- which aid or assistance can be obtained munications should be provided at promptly. points where men or supplies are regularly loaded on or unloaded from the § 75.1403–5 Criteria—Belt conveyors. belt conveyors. (a) Positive-acting stop controls (j) Persons should not cross moving should be installed along all belt con- belt conveyors, except where suitable veyors used to transport men, and such crossing facilities are provided. controls should be readily accessible and maintained so that the belt can be § 75.1403–6 Criteria—Self-propelled stopped or started at any location. personnel carriers. (b) Belt conveyors used for regularly (a) Each self-propelled personnel car- scheduled mantrips should be stopped rier should: while men are loading or unloading. (1) Be provided with an audible warn- (c) All belt conveyors used for the ing device; transportation of persons should have a (2) Be provided with a sealed-beam minimum vertical clearance of 18 headlight, or its equivalent, on each inches from the nearest overhead pro- end; jection when measured from the edge (3) Be provided with reflectors on of the belt and there should be at least both ends and sides. 36 inches of side clearance where men (b) In addition, each track-mounted board or leave such belt conveyors. self-propelled personnel carrier should: (d) When men are being transported (1) Be provided with a suitable lifting on regularly scheduled mantrips on jack and bar, which shall be secured or belt conveyors the belt speed should carried in a tool compartment; not exceed 300 feet per minute when (2) Be equipped with 2 separate and the vertical clearance is less than 24 independent braking systems properly inches, and should not exceed 350 feet installed and well maintained; per minute when the vertical clearance (3) Be equipped with properly in- is 24 inches or more. stalled and well-maintained sanding (e) Adequate illumination including devices, except that personnel carriers colored lights or reflective signs should (jitneys), which transport not more

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than 5 men, need not be equipped with (m) The mine car next to a trolley lo- such sanding device; comotive should not be used to trans- (4) If an open type, be equipped with port men. Such cars may be used to guards of sufficient strength and transport small tools and supplies. height to prevent personnel from being This is not to be construed as permit- thrown from such carriers. ting the transportation of large or bulky supplies such as shuttle car § 75.1403–7 Criteria—Mantrips. wheel units, or similar material. (a) Mantrips should be operated inde- (n) Drop-bottom cars used to trans- pendently of any loaded trip, empty port men should have the bottoms se- trip, or supply trip and should not be cured with an additional locking de- operated within 300 feet of any trip, in- vice. cluding another mantrip. (o) Extraneous materials or supplies (b) A sufficient number of mantrip should not be transported on top of cars should be provided to prevent equipment; however, materials and overcrowding of men. supplies that are necessary for or re- (c) Mantrips should not be pushed. lated to the operation of such equip- (d) Where mantrips are operated by ment may be transported on top of locomotives on slopes such mantrips such equipment if a hazard is not intro- should be coupled to the front and rear duced. by locomotives capable of holding such mantrips. Where ropes are used on [35 FR 17890, Nov. 20, 1970, as amended at 53 slopes for mantrip haulage, such con- FR 46786, Nov. 18, 1988] veyances should be connected by chains, steel ropes, or other effective § 75.1403–8 Criteria—Track haulage devices between mantrip cars and the roads. rope. (a) The speed at which haulage equip- (e) Safety goggles or eyeshields ment is operated should be determined should be provided for all persons being by the condition of the roadbed, rails, transported in open-type mantrips. rail joints, switches, frogs, and other (f) All trips, including trailers and elements of the track and the type and sleds, should be operated at speeds con- condition of the haulage equipment. sistent with conditions and the equip- (b) Track haulage roads should have ment used, and should be so controlled a continuous clearance on one side of that they can be stopped within the at least 24 inches from the farthest pro- limits of visibility. jection of normal traffic. Where it is (g) All mantrips should be under the necessary to change the side on which direction of a supervisor and the oper- clearance is provided, 24 inches of ator of each mantrip should be familiar clearance should be provided on both with the haulage safety rules and regu- sides for a distance of not less than 100 lations. (h) Men should proceed in an orderly feet and warning signs should be posted manner to and from mantrips and no at such locations. person should be permitted to get on or (c) Track haulage roads developed off a moving mantrip. after March 30, 1970, should have clear- (i) [Reserved] ance on the ‘‘tight’’ side of at least 12 (j) Mantrips should not be permitted inches from the farthest projection of to proceed until the operator of the normal traffic. A minimum clearance mantrip is assured that he has a clear of 6 inches should be maintained on the road. ‘‘tight’’ side of all track haulage roads (k) Supplies or tools, except small developed prior to March 30, 1970. hand tools or instruments, should not (d) The clearance space on all track be transported with men. haulage roads should be kept free of (l) At places where men enter or loose rock, supplies, and other loose leave mantrip conveyances, ample materials. clearance should be provided and provi- (e) Positive stopblocks or derails sions made to prevent persons from should be installed on all tracks near coming in contact with energized elec- the top and at landings of shafts, tric circuits. slopes, and surface inclines.

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§ 75.1403–9 Criteria—Shelter holes. (c) Warning lights or reflective signs (a) Shelter holes should be provided or tapes should be installed along haul- on track haulage roads at intervals of age roads at locations of abrupt or sud- not more than 105 feet unless otherwise den changes in the overhead clearance. approved by the Coal Mine Safety Dis- (d) No person, other than the motor- trict Manager(s). man and brakeman, should ride on a lo- (b) Shelter holes should be readily comotive unless authorized by the accessible and should be at least 5 feet mine foreman, and then only when safe in depth, not more than 4 feet in width riding facilities are provided. No per- (except crosscuts used as shelter holes) son should ride on any loaded car or on and at least the height of the coal seam the bumper of any car. However, the where the coal seam is less than 6 feet brakeman may ride on the rear bumper high and at least 6 feet in height where of the last car of a slow moving trip the coal seam is 6 feet or more in pulled by a locomotive. height. (e) Positive-acting stopblocks or de- (c) Shelter holes should be kept free rails should be used where necessary to of refuse and other obstructions. Cross- protect persons from danger of run- cuts used as shelter holes should be away haulage equipment. kept free of refuse or other materials (f) An audible warning should be to a depth of at least 15 feet. given by the operator of all self-pro- (d) Shelter holes should be provided pelled equipment including off-track at all manually operated doors and at equipment, where persons may be en- switch throws except: (1) At room dangered by the movement of the switches, or (2) at switches where more equipment. than 6 feet of side clearance is pro- (g) Locomotives and personnel car- vided. The Coal Mine Safety District riers should not approach to within 300 Manager(s) may permit exemption of feet of preceding haulage equipment, this requirement if such shelter holes except trailing locomotives that are an create a hazardous roof condition. integral part of the trip. (e) At each underground slope land- (h) A total of at least 36 inches of un- ing where men pass and cars are han- obstructed side clearance (both sides dled, a shelter hole at least 10 feet in combined) should be provided for all depth, 4 feet in width, and 6 feet in rubber-tired haulage equipment where height should be provided. such equipment is used. (i) Off-track haulage roadways should § 75.1403–10 Criteria—Haulage; gen- be maintained as free as practicable eral. from bottom irregularities, debris, and (a) A permissible trip light or other wet or muddy conditions that affect approved device such as reflectors, ap- the control of the equipment. proved by the Coal Mine Safety Dis- (j) Operators of self-propelled equip- trict Manager(s), should be used on the ment should face in the direction of rear of trips pulled, on the front of travel. trips pushed and on trips lowered in (k) Mechanical steering and control slopes. However, trip lights or other devices should be maintained so as to approved devices need not be used on provide positive control at all times. cars being shifted to and from loading (l) All self-propelled rubber-tired machines, on cars being handled at haulage equipment should be equipped loading heads, during gathering oper- with well maintained brakes, lights, ations at working faces, when trailing and a warning device. locomotives are used, or on trips pulled (m) On and after March 30, 1971, all by animals. tram control switches on rubber-tired (b) Cars on main haulage roads equipment should be designed to pro- should not be pushed, except where vide automatic return to the stop or off necessary to push cars from side tracks position when released. located near the working section to the producing entries and rooms, where § 75.1403–11 Criteria—Entrances to necessary to clear switches and shafts and slopes. sidetracks, and on the approach to All open entrances to shafts should cages, slopes, and surface inclines. be equipped with safety gates at the

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top and at each landing. Such gates WIRE ROPES should be self-closing and should be kept closed except when the cage is at SOURCE: Sections 75.1429 through 75.1438 ap- such landing. pear at 48 FR 53239, Nov. 25, 1983, unless otherwise noted. § 75.1404 Automatic brakes; speed reduction gear. § 75.1429 Guide ropes. If guide ropes are used in shafts for [STATUTORY PROVISIONS] personnel hoisting applications other than shaft development, the nominal Each locomotive and haulage car strength (manufacturer’s published used in an underground coal mine shall catalog strength) of the guide rope at be equipped with automatic brakes, installation shall meet the minimum where space permits. Where space does value calculated as follows: Minimum not permit automatic brakes, loco- value = Static Load × 5.0. motives and haulage cars shall be subject to speed reduction gear, or other § 75.1430 Wire ropes; scope. similar devices approved by the Sec- (a) Sections 75.1430 through 75.1438 retary, which are designed to stop the apply to wire ropes in service used to locomotives and haulage cars with the hoist— proper margin of safety. (1) Persons in shafts or slopes underground; or § 75.1404–1 Braking system. (2) Loads in shaft or slope development when persons work below the sus- A locomotive equipped with a dual pended loads. braking system will be deemed to sat- (b) These standards do not apply to isfy the requirements of § 75.1404 for a wire ropes used for elevators. train comprised of such locomotive and haulage cars, provided the locomotive § 75.1431 Minimum rope strength. is operated within the limits of its de- At installation, the nominal strength sign capabilities and at speeds con- (manufacturer’s published catalog sistent with the condition of the haul- strength) of wire ropes used for hoist- age road. A trailing locomotive or ing shall meet the minimum rope equivalent devices should be used on strength values obtained by the fol- trains that are operated on ascending lowing formulas in which ‘‘L’’ equals grades. the maximum suspended rope length in feet: § 75.1405 Automatic couplers. (a) Winding drum ropes (all construc- tions, including rotation resistant). [STATUTORY PROVISIONS] For rope lengths less than 3,000 feet: All haulage equipment acquired by Minimum Value = Static Load × an operator of a coal mine on or after (7.0¥0.001L) March 30, 1971, shall be equipped with For rope lengths 3,000 feet or greater: Minimum Value = Static Load × 4.0 automatic couplers which couple by impact and uncouple without the ne- (b) Friction drum ropes. cessity of persons going between the For rope lengths less than 4,000 feet: ends of such equipment. All haulage Minimum Value = Static Load × (7.0 ¥ equipment without automatic couplers 0.0005L) in use in a mine on March 30, 1970, shall For rope lengths 4,000 feet or greater: Minimum Value = Static Load × 5.0 also be so equipped within 4 years after March 30, 1970. (c) Tail ropes (balance ropes). Minimum Value = Weight of Rope × 7.0 § 75.1405–1 Automatic couplers, haulage equipment. [48 FR 53239, Nov. 25, 1983; 48 FR 54975, Dec. 8, 1983] The requirement of § 75.1405 with respect to automatic couplers applies § 75.1432 Initial measurement. only to track haulage cars which are After initial rope stretch but before regularly coupled and uncoupled. visible wear occurs, the rope diameter

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of newly installed wire ropes shall be and records of examinations shall be measured at least once in every third retained for one year. interval of active length and the meas- (e) The person making the measure- urements averaged to establish a base- ments or nondestructive tests as re- line for subsequent measurements. A quired by paragraph (c) of this section record of the measurements and the shall record the measurements or test date shall be made by the person tak- results and the date. This record shall ing the measurements. This record be retained until the rope is retired shall be retained until the rope is re- from service. tired from service. [48 FR 53239, Nov. 25, 1983, as amended at 60 [48 FR 53239, Nov. 25, 1983, as amended at 60 FR 33723, June 29, 1995] FR 33723, June 29, 1995] § 75.1434 Retirement criteria. § 75.1433 Examinations. Unless damage or deterioration is re- (a) At least once every fourteen cal- moved by cutoff, wire ropes shall be re- endar days, each wire rope in service moved from service when any of the shall be visually examined along its en- following conditions occurs: tire active length for visible structural (a) The number of broken wires with- damage, corrosion, and improper lubri- in a rope lay length, excluding filler cation or dressing. In addition, visual wires, exceeds either— (1) Five percent of the total number examination for wear and broken wires of wires; or shall be made at stress points, includ- (2) Fifteen percent of the total num- ing the area near attachments, where ber of wires within any strand; the rope rests on sheaves, where the (b) On a regular lay rope, more than rope leaves the drum, at drum cross- one broken wire in the valley between overs, and at change-of-layer regions. strands in one rope lay length; When any visible condition that results (c) A loss of more than one-third of in a reduction of rope strength is the original diameter of the outer present, the affected portion of the wires; rope shall be examined on a daily basis. (d) Rope deterioriation from corro- (b) Before any person is hoisted with sion; a newly installed wire rope or any wire (e) Distortion of the rope structure; rope that has not been examined in the (f) Heat damage from any source; previous fourteen calendar days, the (g) Diameter reduction due to wear wire rope shall be examined in accord- that exceeds six percent of the baseline ance with paragraph (a) of this section. diameter measurement; or (c) At least once every six months, (h) Loss of more than ten percent of nondestructive tests shall be conducted rope strength as determined by non- of the active length of the rope, or rope destructive testing. diameter measurements shall be made— § 75.1435 Load end attachments. (1) Wherever wear is evident; (a) Wire rope shall be attached to the (2) Where the hoist rope rests on load by a method that develops at least sheaves at regular stopping points; 80 percent of the nominal strength of (3) Where the hoist rope leaves the the rope. drum at regular stopping points; and (b) Except for terminations where use (4) At drum crossover and change-of- of other materials is a design feature, layer regions. zinc (spelter) shall be used for (d) At the completion of each exam- socketing wire ropes. Design feature ination required by paragraph (a) of means either the manufacturer’s origi- this section, the person making the ex- nal design or a design approved by a amination shall certify, by signature registered professional engineer. and date, that the examination has (c) Load end attachment methods been made. If any condition listed in using splices are prohibited. paragraph (a) of this standard is present, the person conducting the ex- § 75.1436 Drum end attachment. amination shall make a record of the (a) For drum end attachment, wire condition and the date. Certifications rope shall be attached—

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(1) Securely by clips after making ation and Firefighting Program of In- one full turn around the drum spoke; struction. (2) Securely by clips after making (2) The responsible person shall be one full turn around the shaft, if the trained annually in a course of instruc- drum is fixed to the shaft; or tion in mine emergency response, as (3) By properly assembled anchor prescribed by MSHA’s Office of Edu- bolts, clamps, or wedges, provided that cational Policy and Development. The the attachment is a design feature of course will include topics such as the the hoist drum. Design feature means following: either the manufacturer’s original de- (i) Organizing a command center; sign or a design approved by a reg- (ii) Coordinating firefighting per- istered professional engineer. sonnel; (b) A minimum of three full turns of (iii) Deploying firefighting equip- wire rope shall be on the drum when ment; the rope is extended to its maximum working length. (iv) Coordinating mine rescue personnel; § 75.1437 End attachment retermi- (v) Establishing fresh air base; nation. (vi) Deploying mine rescue teams; Damaged or deteriorated wire rope (vii) Providing for mine gas sampling shall be removed by cutoff and the rope and analysis; reterminated where there is— (viii) Establishing security; (a) More than one broken wire at an (ix) Initiating an emergency mine attachment; evacuation; (b) Improper installation of an at- (x) Contacting emergency personnel; tachment; and (c) Slippage at an attachment; or (xi) Communicating appropriate in- (d) Evidence of deterioration from formation related to the emergency. corrosion at an attachment. (3) The operator shall certify by signature and date after each responsible § 75.1438 End attachment replacement. person has completed the training and Wire rope attachments shall be re- keep the certification at the mine for 1 placed when cracked, deformed, or ex- year. cessively worn. (b) The responsible person shall initiate and conduct an immediate mine Subpart P—Mine Emergencies evacuation when there is a mine emergency which presents an imminent § 75.1500 [Reserved] danger to miners due to fire or explosion or gas or water inundation. Only § 75.1501 Emergency evacuations. properly trained and equipped persons (a) For each shift that miners work essential to respond to the mine emer- underground, there shall be in attend- gency may remain underground. ance a responsible person designated by (c) The mine operator shall instruct the mine operator to take charge dur- all miners of the identity of the respon- ing mine emergencies involving a fire, sible person designated by the operator explosion, or gas or water inundation. for their workshift. The mine operator (1) The responsible person shall have shall instruct miners of any change in current knowledge of the assigned loca- the identity of the responsible person tion and expected movements of min- before the start of their workshift. ers underground, the operation of the (d) Nothing in this section shall be mine ventilation system, the locations construed to restrict the ability of of the mine escapeways and refuge alternatives, the mine communications other persons in the mine to warn of an system, any mine monitoring system if imminent danger which warrants evac- used, locations of firefighting equip- uation. ment, the mine’s Emergency Response [68 FR 53049, Sept. 9, 2003, as amended at 73 Plan, the Mine Rescue Notification FR 7655, Feb. 8, 2008; 73 FR 80697, Dec. 31, Plan, and the Mine Emergency Evacu- 2008]

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§ 75.1502 Mine emergency evacuation (iii) Traversing undercasts or and firefighting program of instruc- overcasts; tion. (iv) Switching escapeways, as appli- Each operator of an underground coal cable; mine shall adopt and follow a mine (v) Negotiating any other unique emergency evacuation and firefighting escapeway conditions; and program that instructs all miners in (vi) Using refuge alternatives. the proper procedures they must follow (5) Location and use of the fire sup- if a mine emergency occurs. pression and firefighting equipment (a) Program approval. The operator and materials available in the mine. shall submit this program of instruc- (6) Location of the escapeways, exits, tion, and any revisions, for approval to routes of travel to the surface, includ- the District Manager of the Coal Mine ing the location of continuous direc- Safety and Health district in which the tional lifelines or equivalent devices. mine is located. Within 30 days of ap- (7) Location, quantity, types, and use proval, the operator shall conduct of stored SCSRs, as applicable. training in accordance with the revised (8) A review of the mine map; the program. (b) New or revised provisions. Before escapeway system; the escape, fire- implementing any new or revised ap- fighting, and emergency evacuation proved provision in the program of in- plan in effect at the mine; and the loca- struction, the operator shall instruct tions of refuge alternatives and aban- miners in the change. doned areas. (c) Instruction plan. The approved pro- (9) A description of how miners will gram shall include a specific plan de- receive annual expectations training signed to instruct miners on all shifts that includes practical experience in on the following: donning and transferring SCSRs in (1) Procedures for— smoke, simulated smoke, or an equiva- (i) Evacuating the mine for mine lent environment and breathing emergencies that present an imminent through a realistic SCSR training unit danger to miners due to fire, explosion, or device that provides the sensation of or gas or water inundation; SCSR airflow resistance and heat. (ii) Evacuating all miners not re- (10) A summary of the procedures required for a mine emergency response; lated to deploying refuge alternatives. and (11) A summary of the construction (iii) The rapid assembly and trans- methods for 15 psi stoppings con- portation of necessary miners, fire sup- structed prior to an event. pression equipment, and rescue appa- (12) A summary of the procedures re- ratus to the scene of the mine emer- lated to refuge alternative use. gency. (d) Instructors. (1) The mine operator (2) The use, care, and maintenance of shall designate a person who has the self-rescue devices, including hands-on ability, training, knowledge, or experi- training in the complete donning and ence to conduct the mine emergency transferring of all types of self-rescue evacuation instruction and drills in his devices used at the mine. or her area of expertise. (3) The deployment, use, and mainte- (2) Persons conducting SCSR donning nance of refuge alternatives. and transferring training shall be able (4) Scenarios requiring a discussion to effectively train and evaluate of options and a decision as to the best whether miners can successfully don option for evacuation under each of the the SCSR and transfer to additional various mine emergencies (fires, explo- SCSR devices. sions, or gas or water inundations). These options shall include: [71 FR 71452, Dec. 8, 2006, as amended at 73 (i) Encountering conditions in the FR 80697, Dec. 31, 2008] mine or circumstances that require immediate donning of self-rescue devices. § 75.1503 Use of fire suppression (ii) Using continuous directional life- equipment. lines or equivalent devices, tethers, In addition to the approved program and doors; of instruction required by 30 CFR

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75.1502, each operator of an under- (1) Hands-on training on all types of ground coal mine shall ensure the fol- self-rescue devices used at the mine, lowing. which includes— (a) Working section. At least two min- (i) Instruction and demonstration in ers in each working section on each the use, care, and maintenance of self- production shift shall be proficient in rescue devices; the use of all fire suppression equip- (ii) The complete donning of the ment available on such working sec- SCSR by assuming a donning position, tion, and know the location of such fire opening the device, activating the de- suppression equipment. vice, inserting the mouthpiece, and (b) Attended equipment. Each operator putting on the nose clip; and of attended equipment specified in 30 (iii) Transferring between all applica- CFR 75.1107–1(c)(1), and each miner as- ble self-rescue devices. signed to perform job duties at the job (2) Training that emphasizes the im- portance of— site in the direct line of sight of at- (i) Recognizing when the SCSR is not tended equipment as described in 30 functioning properly and dem- CFR 75.1107–1(c)(2), shall be proficient onstrating how to initiate and reini- in the use of fire suppression devices tiate the starting sequence; installed on such attended equipment. (ii) Not removing the mouthpiece, (c) Maintenance shift. The shift fore- even to communicate, until the miner man and at least one miner for every reaches fresh air; and five miners working underground on a (iii) Proper use of the SCSR by con- maintenance shift shall be proficient in trolling breathing and physical exer- the use of fire suppression equipment tion. available in the mine, and know the lo- (3) A realistic escapeway drill that is cation of such fire suppression equip- initiated and conducted with a dif- ment. ferent approved scenario each quarter [71 FR 71452, Dec. 8, 2006] and during which each miner— (i) Travels the primary or alternate § 75.1504 Mine emergency evacuation escapeway in its entirety, alternating training and drills. escapeways each quarter; Each operator of an underground coal (ii) Physically locates and practices mine shall conduct mine emergency using the continuous directional life- evacuation training and drills and re- lines or equivalent devices and tethers, quire all miners to participate. and physically locates the stored SCSRs and refuge alternatives; (a) Schedule of training and drills. (iii) Traverses undercasts or Each miner shall participate in a mine overcasts and doors; emergency evacuation training and (iv) Switches escapeways, as applica- drill once each quarter. Quarters shall ble; and be based on a calendar year (Jan–Mar, (v) Negotiates any other unique Apr–Jun, Jul–Sep, Oct–Dec). In addi- escapeway conditions. tion— (4) A review of the mine and (1) A newly hired miner, who has not escapeway maps, the firefighting plan, participated in a mine emergency evac- and the mine emergency evacuation uation training and drill at the mine plan in effect at the mine, which shall within the previous 3 months, shall include: participate in the next applicable mine (i) Informing miners of the locations emergency evacuation training and of fire doors, check curtains, changes drill. in the routes of travel, and plans for di- (2) Prior to assuming duties on a sec- verting smoke from escapeways. tion or outby work location, a foreman (ii) Locating escapeways, exits, shall travel both escapeways in their routes of travel to the surface, aban- entirety. doned areas, and refuge alternatives. (b) Content of quarterly training and (5) Operation of the fire suppression drill. Each quarterly evacuation train- equipment available in the mine and ing and drill shall include the fol- the location and use of firefighting lowing: equipment and materials.

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(6) Reviewing the procedures for de- training shall be provided to the par- ploying refuge alternatives and compo- ticipating miner. nents. (7) For miners who will be con- [71 FR 71452, Dec. 8, 2006, as amended at 73 FR 80698, Dec. 31, 2008] structing the 15 psi stoppings prior to an event, reviewing the procedures for § 75.1505 Escapeway maps. constructing them. (8) Reviewing the procedures for use (a) Content and accessibility. An of the refuge alternatives and compo- escapeway map shall show the des- nents. ignated escapeways from the working (9) Task training in proper transpor- sections or the miners’ work stations tation of the refuge alternatives and to the surface or the exits at the bot- components. tom of the shaft or slope, refuge alter- (c) Annual expectations training. Over natives, and SCSR storage locations. the course of each year, each miner The escapeway map shall be posted or shall participate in expectations train- readily accessible for all miners— ing that includes the following: (1) In each working section; (1) Donning and transferring SCSRs (2) In each area where mechanized in smoke, simulated smoke, or an mining equipment is being installed or equivalent environment. removed; (2) Breathing through a realistic (3) At the refuge alternative; and SCSR training unit that provides the (4) At a surface location of the mine sensation of SCSR airflow resistance where miners congregate, such as at and heat. the mine bulletin board, bathhouse, or (3) Deployment and use of refuge al- waiting room. ternatives similar to those in use at (b) Keeping maps current. All maps the mine, including— shall be kept up-to-date and any (i) Deployment and operation of com- change in route of travel, location of ponent systems; and doors, location of refuge alternatives, (ii) Instruction on when to use refuge or direction of airflow shall be shown alternatives during a mine emergency, on the maps by the end of the shift on emphasizing that it is the last resort which the change is made. when escape is impossible. (c) Informing affected miners. Miners (4) A miner shall participate in ex- underground on a shift when any such pectations training within one quarter change is made shall be notified imme- of being employed at the mine. diately of the change and other af- (d) Certification of training and drills. fected miners shall be informed of the At the completion of each training or change before entering the under- drill required in this section, the oper- ground areas of the mine. ator shall certify by signature and date that the training or drill was held in [71 FR 71452, Dec. 8, 2006, as amended at 73 accordance with the requirements of FR 80698, Dec. 31, 2008] this section. § 75.1506 Refuge alternatives. (1) This certification shall include the names of the miners participating (a) Each operator shall provide refuge in the training or drill. For each miner, alternatives and components as fol- this certification shall list the content lows: of the training or drill component com- (1) Prefabricated self-contained pleted, including the escapeway trav- units, including the structural, breath- eled and scenario used, as required in able air, air monitoring, and harmful paragraphs (b) and (c) of this section. gas removal components of the unit, (2) Certifications shall be kept at the shall be approved under 30 CFR part 7; mine for one year. and (3) Upon request, the certifications (2) The structural components of shall be made available to an author- units consisting of 15 psi stoppings con- ized representative of the Secretary structed prior to an event shall be ap- and the representative of the miners. proved by the District Manager, and (4) Upon request, a copy of the cer- the breathable air, air monitoring, and tification that shows his or her own harmful gas removal components of

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these units shall be approved under 30 (1) Within 1,000 feet from the nearest CFR part 7. working face and from locations where (3) Prefabricated refuge alternative mechanized mining equipment is being structures that states have approved installed or removed except that for and those that MSHA has accepted in underground anthracite coal mines approved Emergency Response Plans that have no electrical face equipment, (ERPs) that are in service prior to refuge alternatives shall be provided if March 2, 2009 are permitted until De- the nearest working face is greater cember 31, 2018, or until replaced, than 2,000 feet from the surface. whichever comes first. Breathable air, (2) Spaced within one-hour travel dis- air-monitoring, and harmful gas re- tances in outby areas where persons moval components of either a prefab- work such that persons in outby areas ricated self-contained unit or a unit are never more than a 30-minute travel consisting of 15 psi stoppings con- distance from a refuge alternative or structed prior to an event in a secure safe exit. However, the operator may space and an isolated atmosphere that request and the District Manager may states have approved and those that approve a different location in the MSHA has accepted in approved ERPs ERP. The operator’s request shall be that are in use prior to March 2, 2009 based on an assessment of the risk to are permitted until December 31, 2013, persons in outby areas, considering the or until replaced, whichever comes following factors: proximity to seals; first. Refuge alternatives consisting of materials pre-positioned for miners to proximity to potential fire or ignition deploy in a secure space with an iso- sources; conditions in the outby areas; lated atmosphere that MSHA has ac- location of stored SCSRs; and prox- cepted in approved ERPs that are in imity to the most direct, safe, and use prior to March 2, 2009 are permitted practical route to an intake escapeway. until December 31, 2010, or until re- (d) Roof and rib support for refuge al- placed, whichever comes first. ternative locations shall be specified in (b) Except as permitted under para- the mine’s roof control plan. graph (a)(3) of this section, each oper- (e) The operator shall protect the ref- ator shall provide refuge alternatives uge alternative and contents from with sufficient capacity to accommo- damage during transportation, instal- date all persons working underground. lation, and storage. (1) Refuge alternatives shall provide (f) A refuge alternative shall be re- at least 15 square feet of floor space per moved from service if examination re- person and 30 to 60 cubic feet of volume veals damage that interferes with the per person according to the following functioning of the refuge alternative or chart. The airlock can be included in any component. the space and volume if waste is dis- (1) If a refuge alternative is removed posed outside the refuge alternative. from service, the operator shall withdraw all persons from the area serviced Unrestricted volume Mining height (inches) (cubic feet) per person* by the refuge alternative, except those persons referred to in § 104(c) of the 36 or less ...... 30 Mine Act. >36–≤42 ...... 37.5 >42–≤48 ...... 45 (2) Refuge alternative components re- >48–≤54 ...... 52.5 moved from service shall be replaced or >54 ...... 60 be repaired for return to service in ac- * Includes an adjustment of 12 inches for clearances. cordance with the manufacturer’s spec- (2) Refuge alternatives for working ifications. sections shall accommodate the max- (g) At all times, the site and area imum number of persons that can be around the refuge alternative shall be expected on or near the section at any kept clear of machinery, materials, time. and obstructions that could interfere (3) Each refuge alternative for outby with the deployment or use of the ref- areas shall accommodate persons rea- uge alternative. sonably expected to use it. (h) Each refuge alternative shall be (c) Refuge alternatives shall be pro- conspicuously identified with a sign or vided at the following locations: marker as follows:

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(1) A sign or marker made of a reflec- (5) The methods for providing ready tive material with the word ‘‘REF- backup oxygen controls and regulators. UGE’’ shall be posted conspicuously at (6) The methods for providing an air- each refuge alternative. lock and for providing breathable air in (2) Directional signs made of a reflec- the airlock, except where adequate tive material shall be posted leading to positive pressure is maintained. each refuge alternative location. (7) The methods for providing sanita- (i) During use of the refuge alter- tion facilities. native, the atmosphere within the refuge alternative shall be monitored. (8) The methods for harmful gas re- Changes or adjustments shall be made moval, if necessary. to reduce the concentration of methane (9) The methods for monitoring gas to less than 1 percent; to reduce the concentrations, including charging and concentration of carbon dioxide to 1 calibration of equipment. percent or less and excursions not ex- (10) The method for providing light- ceeding 2.5 percent; and to reduce the ing sufficient for persons to perform concentration of carbon monoxide to 25 tasks. ppm or less. Oxygen shall be main- (11) Suitable locations for the refuge tained at 18.5 to 23 percent. alternatives and an affirmative state- (j) Refuge alternatives shall contain ment that the locations are— a fire extinguisher that— (i) Not within direct line of sight of (1) Meets the requirements for port- the working face; and able fire extinguishers used in under- (ii) Where feasible, not placed in ground coal mines under this part; (2) Is appropriate for extinguishing areas directly across from, nor closer fires involving the chemicals used for than 500 feet radially from, belt drives, harmful gas removal; and take-ups, transfer points, air compres- (3) Uses a low-toxicity extinguishing sors, explosive magazines, seals, en- agent that does not produce a haz- trances to abandoned areas, and fuel, ardous by-product when activated. oil, or other flammable or combustible material storage. However, the oper- [73 FR 80698, Dec. 31, 2008] ator may request and the District Man- § 75.1507 Emergency Response Plan; ager may approve an alternative loca- refuge alternatives. tion in the ERP if mining involves two- (a) The Emergency Response Plan entry systems or yield pillars in a (ERP) shall include the following for longwall that would prohibit locating each refuge alternative and compo- the refuge alternative out of direct line nent: of sight of the working face. (1) The types of refuge alternatives (12) The maximum mine air tempera- used in the mine, i.e., a prefabricated ture at each of the locations where ref- self-contained unit or a unit consisting uge alternatives are to be placed. of 15 psi stoppings constructed prior to (b) For a refuge alternative con- an event in a secure space and an iso- sisting of 15 psi stoppings constructed lated atmosphere. prior to an event in a secure space and (2) Procedures or methods for main- an isolated atmosphere, the ERP shall taining approved refuge alternatives specify that— and components. (1) The breathable air components (3) The rated capacity of each refuge shall be approved by MSHA; and alternative, the number of persons ex- (2) The refuge alternative can with- pected to use each refuge alternative, and the duration of breathable air pro- stand exposure to a flash fire of 300 de- ° vided per person by the approved grees Fahrenheit ( F) for 3 seconds and breathable air component of each ref- a pressure wave of 15 pounds per square uge alternative. inch (psi) overpressure for 0.2 seconds. (4) The methods for providing breath- (c) If the refuge alternative sustains able air with sufficient detail of the persons for only 48 hours, the ERP component’s capability to provide shall detail advanced arrangements breathable air over the duration stated that have been made to assure that in the approval. persons who cannot be rescued within

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48 hours will receive additional sup- (4) First aid supplies. plies to sustain them until rescue. Ad- vance arrangements shall include the [73 FR 80699, Dec. 31, 2008] following: § 75.1508 Training and records for ex- (1) Pre-surveyed areas for refuge al- amination, maintenance and repair ternatives with closure errors of less of refuge alternatives and compo- than 20,000:1. nents. (2) An analysis to demonstrate that the surface terrain, the strata, the ca- (a) Persons examining, maintaining, pabilities of the drill rig, and all other or repairing refuge alternatives and factors that could affect drilling are components shall be instructed in how such that a hole sufficient to provide to perform this work. required supplies and materials reli- (1) The operator shall assure that all ably can be promptly drilled within 48 persons assigned to examine, maintain, hours of an accident at a mine. and repair refuge alternatives and com- (3) Permissions to cross properties, ponents are trained. build roads, and construct drill sites. (2) The mine operator shall certify, (4) Arrangement with a drilling con- by signature and date, the training of tractor or other supplier of drilling persons who examine, maintain, and services to provide a suitable drilling repair refuge alternatives and compo- rig, personnel and support so that a nents. hole can be completed to the refuge al- (b) At the completion of each repair, ternative within 48 hours. the person conducting the maintenance (5) Capability to promptly transport or repair shall make a record of all cor- a drill rig to a pre-surveyed location rective action taken. such that a drilled hole would be com- (c) Training certifications and repair pleted and located near a refuge alter- records shall be kept at the mine for native structure within 48 hours of an one year. accident at a mine. (6) The specifications of pipes, air [73 FR 80699, Dec. 31, 2008] lines, and approved fans or approved compressors that will be used. Subpart Q—Communications (7) A method for assuring that within 48 hours, breathable air shall be pro- § 75.1600 Communications. vided. (8) A method for assuring the imme- [STATUTORY PROVISIONS] diate availability of a backup source Telephone service or equivalent two- for supplying breathable air and a way communication facilities, ap- backup power source for surface installations. proved by the Secretary or his author- (d) The ERP shall specify that the ized representative, shall be provided refuge alternative is stocked with the between the surface and each landing following: of main shafts and slopes and between (1) A minimum of 2,000 calories of the surface and each working section of food and 2.25 quarts of potable water any coal mine that is more than 100 per person per day in approved con- feet from a portal. tainers sufficient to sustain the maximum number of persons reasonably § 75.1600–1 Communication facilities; main portals; installation require- expected to use the refuge alternative ments. for at least 96 hours, or for 48 hours if advance arrangements are made under A telephone or equivalent two-way paragraph (c) of this section; communication facility shall be lo- (2) A manual that contains sufficient cated on the surface within 500 feet of detail for each refuge alternative or all main portals, and shall be installed component addressing in-mine trans- either in a building or in a box-like portation, operation, and maintenance structure designed to protect the facili- of the unit; ties from damage by inclement weath- (3) Sufficient quantities of materials er. At least one of these communica- and tools to repair components; and tion facilities shall be at a location

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where a responsible person who is al- (2) An additional communication sys- ways on duty when men are under- tem and other requirements as defined ground can hear the facility and re- in the communications portion of the spond immediately in the event of an operator’s approved Emergency Re- emergency. sponse Plan. [38 FR 29999, Oct. 31, 1973] [73 FR 80700, Dec. 31, 2008] § 75.1600–2 Communication facilities; working sections; installation and Subpart R—Miscellaneous maintenance requirements; audible or visual alarms. § 75.1700 Oil and gas wells. (a) Telephones or equivalent two-way [STATUTORY PROVISIONS] communication facilities provided at each working section shall be located Each operator of a coal mine shall not more than 500 feet outby the last take reasonable measures to locate oil open crosscut and not more than 800 and gas wells penetrating coalbeds or feet from the farthest point of penetra- any underground area of a coal mine. tion of the working places on such sec- When located, such operator shall es- tion. tablish and maintain barriers around (b) The incoming communication sig- such oil and gas wells in accordance nal shall activate an audible alarm, with State laws and regulations, except distinguishable from the surrounding that such barriers shall not be less noise level, or a visual alarm that can than 300 feet in diameter, unless the be seen by a miner regularly employed Secretary or his authorized representa- on the working section. tive permits a lesser barrier consistent (c) If a communication system other with the applicable State laws and reg- than telephones is used and its oper- ulations where such lesser barrier will ation depends entirely upon power be adequate to protect against hazards from the mine electric system, means from such wells to the miners in such shall be provided to permit continued mine, or unless the Secretary or his au- communication in the event the mine thorized representative requires a electric power fails or is cut off; pro- greater barrier where the depth of the vided, however, that where trolley mine, other geologic conditions, or phones and telephones are both used, other factors warrant such a greater an alternate source of power for the barrier. trolley phone system is not required. (d) Trolley phones connected to the § 75.1702 Smoking; prohibition. trolley wire shall be grounded in accordance with Subpart H of this part. [STATUTORY PROVISIONS] (e) Telephones or equivalent two-way communication facilities shall be No person shall smoke, carry smok- maintained in good operating condi- ing materials, matches, or lighters un- tion at all times. In the event of any derground, or smoke in or around oil failure in the system that results in houses, explosives magazines, or other loss of communication, repairs shall be surface areas where such practice may started immediately, and the system cause a fire or explosion. The operator restored to operating condition as soon shall institute a program, approved by as possible. the Secretary, to insure that any person entering the underground area of [38 FR 29999, Oct. 31, 1973] the mine does not carry smoking materials, matches, or lighters. § 75.1600–3 Communications facilities; refuge alternatives. [35 FR 17890, Nov. 20, 1970, as amended at 60 (a) Refuge alternatives shall be pro- FR 33723, June 29, 1995] vided with a communications system that consists of— § 75.1702–1 Smoking programs. (1) A two-way communication facil- Programs required under § 75.1702 ity that is a part of the mine commu- shall be submitted to the Coal Mine nication system, which can be used Safety District Manager for approval from inside the refuge alternative; and on or before May 30, 1970.

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§ 75.1703 Portable electric lamps. § 75.1708–1 Surface structures; fireproof construction. [STATUTORY PROVISIONS] Structures of fireproof construction Persons underground shall use only is interpreted to mean structures with permissible electric lamps approved by fireproof exterior surfaces. the Secretary for portable illumina- § 75.1709 Accumulations of methane tion. No open flame shall be permitted and coal dust on surface coal-han- in the underground area of any coal dling facilities. mine, except as permitted under § 75.1106. [STATUTORY PROVISIONS] Adequate measures shall be taken to § 75.1703–1 Permissible lamps. prevent methane and coal dust from Lamps approved by the Bureau of accumulating in excessive concentra- Mines or the Mine Safety and Health tions in or on surface coal-handling fa- Administration under Part 19 or Part cilities, but in no event shall methane 20 of this chapter (Bureau of Mines be permitted to accumulate in con- Schedule 6D and Schedule 10C) are ap- centrations in or on surface coal-han- proved lamps for the purposes of dling facilities in excess of limits established for methane by the Secretary § 75.1703. on and after March 30, 1971. Where coal § 75.1707–1 New working section. is dumped at or near air-intake openings, provisions shall be made to avoid The term ‘‘new working section’’ as dust from entering the mine. used in § 75.1707 means any extension of the belt or trolley haulage system in § 75.1710 Canopies or cabs; diesel-pow- main, cross, and room entries nec- ered and electric face equipment. essary for the development of the mine In any coal mine where the height of on and after March 30, 1970. Room en- the coalbed permits, an authorized rep- tries being developed as of March 30, resentative of the Secretary may re- 1970, with certified stop line limita- quire that diesel-powered and electric tions as shown on the mine map and re- face equipment, including shuttle cars, treating panels shall not be considered be provided with substantially con- as new working sections. structed canopies or cabs to protect the miners operating such equipment § 75.1708 Surface structures, fire- from roof falls and from rib and face proofing. rolls. [61 FR 55527, Oct. 25, 1996] [STATUTORY PROVISIONS] After March 30, 1970, all structures § 75.1710–1 Canopies or cabs; self-propelled diesel-powered and electric erected on the surface within 100 feet of face equipment; installation re- any mine opening shall be of fireproof quirements. construction. Unless structures exist- (a) Except as provided in paragraph ing on or prior to such date which are (f) of this section, all self-propelled die- located within 100 feet of any mine sel-powered and electric face equip- opening are of such construction, fire ment, including shuttle cars, which is doors shall be erected at effective employed in the active workings of points in mine openings to prevent each underground coal mine on and smoke or fire from outside sources en- after January 1, 1973, shall, in accord- dangering miners underground. These ance with the schedule of time speci- doors shall be tested at least monthly fied in paragraphs (a) (1), (2), (3), (4), to insure effective operation. A record (5), and (6) of this section, be equipped of such tests shall be kept in an area with substantially constructed can- on the surface of the mine chosen by opies or cabs, located and installed in the operator to minimize the danger of such a manner that when the operator destruction by fire or other hazard and is at the operating controls of such shall be available for inspection by in- equipment he shall be protected from terested persons. falls of roof, face, or rib, or from rib

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and face rolls. The requirements of this canopy or cab has the minimum struc- paragraph (a) shall be met as follows: tural capacity to support elastically: (1) On and after January 1, 1974, in (1) A dead weight load of 18,000 pounds, coal mines having mining heights of 72 or (2) 15 p.s.i. distributed uniformly inches or more; over the plan view area of the struc- (2) On and after July 1, 1974, in coal ture, whichever is lesser. mines having mining heights of 60 (e) Evidence of the certification re- inches or more, but less than 72 inches; quired by paragraph (d) of this section (3) On and after January 1, 1975, in shall be furnished by attaching a plate, coal mines having mining heights of 48 label, or other appropriate marking to inches or more, but less than 60 inches; the canopy or cab for which certifi- (4) On and after July 1, 1975, in coal cation has been made, stating that mines having mining heights of 36 inches or more, but less than 48 inches; such canopy or cab meets the min- (5)(i) On and after January 1, 1976, in imum requirements for structural ca- coal mines having mining heights of 30 pacity set forth in paragraph (d) of this inches or more, but less than 36 inches, section. Written evidence of such cer- (ii) On and after July 1, 1977, in coal tification shall also be retained by the mines having mining heights of 24 operator, and shall be made available inches or more, but less than 30 inches, to an authorized representative of the and Secretary upon request. Written evi- (6) On and after July 1, 1978, in coal dence of certification may consist of mines having mining heights of less the report of the registered engineer than 24 inches. who certified the canopy or cab, or of (b)(1) For purposes of this section, a information from the manufacturer of canopy means a structure which pro- the canopy or cab stating that a reg- vides overhead protection against falls istered engineer has certified that the of roof. canopy or cab meets the minimum re- (2) For purposes of this section, a cab quirements for structural capacity set means a structure which provides over- forth in paragraph (d) of this section. head and lateral protection against (f) An operator may apply to the Di- falls of roof, rib, and face, or rib and rector of Technical Support, Mine face rolls. Safety and Health Administration, De- (c) In determining whether to install partment of Labor, 201 12th Street substantially constructed canopies as South, Arlington, VA 22202–5452, for ap- opposed to substantially constructed cabs, the operator shall consider and proval of the installation of devices to take into account the following fac- be used in lieu of substantially con- tors: structed canopies or cabs on self-pro- (1) The mining method used; pelled diesel-powered and electric face (2) Physical limitations, including equipment. The Director of Technical but not limited to the dip of the coal- Support may approve such devices if he bed, and roof, rib, and face conditions; determines that the use thereof will af- (3) Previous accident experience, if ford the equipment operator no less any, caused by falls of roof, rib, and than the same measure of protection face, or rib and face rolls; from falls of roof, face, or rib, or from (4) Overhead protection, such as that rib and face rolls as would a substan- afforded by a substantially constructed tially constructed canopy or cab meet- canopy, against falls of roof will al- ing the requirements of this section. ways be required; and (5) Lateral protection, such as that [37 FR 20690, Oct. 3, 1972, as amended at 41 FR afforded by a substantially constructed 23200, June 9, 1976; 43 FR 12320, Mar. 24, 1978; cab, may also be necessary where the 47 FR 28096, June 29, 1982; 61 FR 55527, Oct. 25, 1996; 67 FR 38386, June 4, 2002; 80 FR 52992, occurrence of falls of rib and face, or Sept. 2, 2015] rib and face rolls is likely. (d) For purposes of this section, a EFFECTIVE DATE NOTE: At 42 FR 34877, July canopy or cab will be considered to be 7, 1977, the dates appearing in paragraphs substantially constructed if a reg- (a)(5)(ii) and (a)(6) of § 75.1710–1 were sus- istered engineer certifies that such pended indefinitely, effective July 1, 1977.

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§ 75.1711 Sealing of mines. ing facilities. Sanitary toilet facilities shall be provided in the active work- [STATUTORY PROVISIONS] ings of the mine when such surface fa- On or after March 30, 1970, the open- cilities are not readily accessible to ing of any coal mine that is declared the active workings. inactive by the operator, or is perma- [35 FR 17890, Nov. 20, 1970, as amended at 60 nently closed, or abandoned for more FR 33723, June 29, 1995] than 90 days, shall be sealed by the operator in a manner prescribed by the § 75.1712–1 Availability of surface Secretary. Openings of all other mines bathing facilities; change rooms; shall be adequately protected in a man- and sanitary facilities. ner prescribed by the Secretary to pre- Except where a waiver has been vent entrance by unauthorized persons. granted pursuant to the provisions of § 75.1712–4, each operator of an under- § 75.1711–1 Sealing of shaft openings. ground coal mine shall on and after De- Shaft openings required to be sealed cember 30, 1970, provide bathing facili- under § 75.1711 shall be effectively ties, clothing change rooms, and sani- capped or filled. Filling shall be for the tary facilities, as hereinafter pre- entire depth of the shaft and, for the scribed, for the use of the miners at the first 50 feet from the bottom of the mine. coalbed, the fill shall consist of incombustible material. Caps consisting of a § 75.1712–2 Location of surface facili- 6-inch thick concrete cap or other ties. equivalent means may be used for seal- Bathhouses, change rooms, and sani- ing. Caps shall be equipped with a vent tary toilet facilities shall be in a loca- pipe at least 2 inches in diameter ex- tion convenient for the use of the min- tending for a distance of at least 15 feet ers. Where such facilities are designed above the surface of the shaft. to serve more than one mine, they shall be centrally located so as to be as § 75.1711–2 Sealing of slope or drift convenient for the use of the miners in openings. all the mines served by such facilities. Slope or drift openings required to be sealed under § 75.1711 shall be sealed § 75.1712–3 Minimum requirements of with solid, substantial, incombustible surface bathing facilities, change material, such as concrete blocks, rooms, and sanitary toilet facilities. bricks or tile, or shall be completely (a) All bathing facilities, change filled with incombustible material for rooms, and sanitary toilet facilities a distance of at least 25 feet into such shall be provided with adequate light, openings. heat, and ventilation so as to maintain a comfortable air temperature and to § 75.1711–3 Openings of active mines. minimize the accumulation of mois- The openings of all mines not de- ture and odors, and such facilities shall clared by the operator, to be inactive, be maintained in a clean and sanitary permanently closed, or abandoned for condition. less than 90 days shall be adequately (b) Bathing facilities, change rooms, fenced or posted with conspicuous signs and sanitary toilet facilities shall be prohibiting the entrance of unauthor- constructed and equipped so as to com- ized persons. ply with applicable State and local building codes: Provided, however, That § 75.1712 Bath houses and toilet facili- where no State or local building codes ties. apply to such facilities, or where no State or local building codes exist, [STATUTORY PROVISIONS] such facilities shall be constructed and The Secretary may require any oper- equipped so as to meet the minimum ator to provide adequate facilities for construction requirements of the Na- the miners to change from the clothes tional Building Code; and the min- worn underground, to provide for the imum plumbing requirements of the storing of such clothes from shift to U.S.A. Standard Plumbing Code, ASA shift, and to provide sanitary and bath- A40.8–1955.

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(c) In addition to the minimum re- requirements, and, upon issuance of quirements specified in paragraphs (a) such waiver, he shall set forth the fa- and (b) of this § 75.1712–3, facilities cilities which will not be required and maintained in accordance with the specific reason or reasons for such § 75.1712–1 shall include the following: waiver. (1) Bathing facilities. (i) Showers shall [35 FR 17890, Nov. 20, 1970, as amended at 60 be provided with both hot and cold FR 33723, June 29, 1995] water. (ii) At least one shower head shall be § 75.1712–5 Application for waiver of provided where five or less miners use surface facilities. such showers. Applications for waivers of the re- (iii) Where five or more miners use quirements of §§ 75.1712–1 through such showers, sufficient showers shall 75.1712–3 shall be filed with the Coal be furnished to provide approximately Mine Safety District Manager and shall one shower head for each five miners. contain the following information: (iv) A suitable cleansing agent shall (a) The name and address of the mine be provided for use at each shower. operator; (2) Sanitary toilet facilities. (i) At least (b) The name and location of the one sanitary flush toilet shall be pro- mine; vided where 10 or less miners use such (c) A statement explaining why, in facilities. the opinion of the operator, the instal- (ii) Where 10 or more miners use such lation or maintenance of the facilities sanitary toilet facilities, sufficient toi- is impractical or unnecessary. lets shall be furnished to provide approximately one sanitary flush toilet § 75.1712–6 Underground sanitary fa- for each 10 miners. cilities; installation and mainte- (iii) Where 30 or more miners use san- nance. itary toilet facilities, one urinal may (a) Except as provided in § 75.1712–7, be substituted for one sanitary flush each operator of an underground coal toilet, however, where such substi- mine shall provide and maintain one tutions are made they shall not reduce sanitary toilet in a dry location under the number of toilets below a ratio of protected roof, within 500 feet of each two toilets to one urinal. working place in the mine where min- (iv) An adequate supply of toilet ers are regularly employed during the paper shall be provided with each toi- mining cycle. A single sanitary toilet let. may serve two or more working places (v) Adequate handwashing facilities in the same mine, if it is located within or hand lavatories shall be provided in 500 feet of each such working place. or adjacent to each toilet facility. (b) Sanitary toilets shall have an at- (3) Change rooms. (i) Individual tached toilet seat with a hinged lid and clothes storage containers or lockers a toilet paper holder together with an shall be provided for storage of miners adequate supply of toilet tissue, except clothing and other incidental personal that a toilet paper holder is not re- belongings during and between shifts. quired for an unenclosed toilet facility. (ii) Change rooms shall be provided (c) Only flush or nonflush chemical with ample space to permit the use of or biological toilets, sealed bag toilets, such facilities by all miners changing and vault toilets meet the require- clothes prior to and after each shift. ments of this section. Privies and combustion or incinerating toilets are pro- § 75.1712–4 Waiver of surface facilities hibited underground. requirements. [68 FR 37087, June 23, 2003] The Coal Mine Safety District Man- ager for the district in which the mine § 75.1712–7 Underground sanitary fa- is located may, upon written applica- cilities; waiver of requirements. tion by the operator, waive any or all If it has been determined by the Coal of the requirements of §§ 75.1712–1 Mine Safety District Manager for the through 75.1712–3 if he determines that district in which the mine is located the operator of the mine cannot or that sanitary toilets cannot be pro- need not meet any part or all of such vided and maintained within 500 feet of

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a working place because of the thick- § 75.1712–10 Underground sanitary fa- ness of the coal seam or because of any cilities; maintenance. other physical restriction in the under- Sanitary toilets shall be regularly ground workings, he may, upon written maintained in a clean and sanitary application by the operator, waive the condition. Holding tanks shall be serv- location requirements for underground iced and cleaned when full and in no sanitary facilities with respect to such case less than once each week by drain- working place. ing or pumping or by removing them to the surface for cleaning or recharging. § 75.1712–8 Application for waiver of Transfer tanks and transfer equipment location requirements for under- used underground shall be equipped ground sanitary facilities. with suitable fittings to permit com- Applications for waivers of the loca- plete drainage of holding tanks with- tion requirements of § 75.1712–6 shall be out spillage and allow for the sanitary filed with the Coal Mine Safety Dis- transportation of wastes to the surface. trict Manager and shall contain the Waste shall be disposed of on the sur- following information: face in accordance with State and local (a) The name and address of the mine laws and regulations. operator; (b) The name and location of the § 75.1713 Emergency medical assistance; first-aid. mine; (c) The thickness of the coal seam in [STATUTORY PROVISIONS] each working place in the mine for which a waiver is requested; and Each operator shall make arrange- (d) Other physical restrictions in the ments in advance for obtaining emer- mine (for example, poor roof condi- gency medical assistance and transpor- tions, excessive water, timbering, etc.). tation for injured persons. Emergency communications shall be provided to If a sanitary toilet cannot be installed the nearest point of assistance. Se- within 500 feet of a working place be- lected agents of the operator shall be cause of physical conditions other than trained in first-aid and first-aid train- the thickness of the coal seam, the op- ing shall be made available to all min- erator shall also include a short state- ers. Each coal mine shall have an ade- ment specifying areas in the mine quate supply of first-aid equipment lo- which could be considered possible al- cated on the surface, at the bottom of ternative sites for installation of such shafts and slopes, and at other stra- facilities. tegic locations near the working faces. In fulfilling each of the requirements § 75.1712–9 Issuance of waivers. of this section, the operator shall meet Following the receipt of an applica- at least minimum requirements pre- tion submitted in accordance with the scribed by the Secretary of Health and Human Services. provisions of § 75.1712–8, the Coal Mine Safety District Manager shall, if he de- [35 FR 17890, Nov. 20, 1970, as amended at 47 termines that the operator cannot FR 14696, Apr. 6, 1982; 60 FR 33723, June 29, meet the location requirements of 1995] § 75.1712–6 with respect to any or all of § 75.1713–1 Arrangements for emer- the working places in the mine because gency medical assistance and trans- of the coal seam thickness or because portation for injured persons; of other physical restriction, issue a agreements; reporting require- waiver of the requirements of this sec- ments; posting requirements. tion and designate an alternative site (a) Each operator of an underground for installation of such facilities. The coal mine shall make arrangements waiver issued shall specify each work- with a licensed physician, medical ing place to which it shall apply, set service, medical clinic, or hospital to forth the reasons for such waiver, and provide 24-hour emergency medical as- the reasons for designation of the al- sistance for any person injured at the ternative site. mine.

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(b) Each operator of an underground means of communication with the per- coal mine shall make arrangements son or persons providing emergency with an ambulance service, or other- medical assistance or transportation in wise provide, for 24-hour emergency accordance with the provisions of transportation for any person injured § 75.1713–1. at the mine. (c) Each operator shall, on or before § 75.1713–3 First-Aid training; super- December 30, 1970, report to the Dis- visory employees. trict Manager for the district in which The mine operator shall conduct the mine is located the name, title and first-aid training courses for selected address of the physician, medical serv- supervisory employees at the mine. ice, medical clinic, hospital or ambu- Within 60 days after the selection of a lance service with whom arrangements new supervisory employee to be so have been made, or otherwise provided, trained, the mine operator shall certify in accordance with the provisions of by signature and date the name of the paragraphs (a) and (b) of this § 75.1713– employee and date on which the em- 1. ployee satisfactorily completed the (d) Each operator shall, within 10 first-aid training course. The certifi- days after any change of the arrange- cation shall be kept at the mine and ments required to be reported under made available on request to an au- the provisions of this § 75.1713–1, report thorized representative of the Sec- such changes to the District Manager. retary. If such changes involve a substitution [56 FR 1478, Jan. 14, 1991] of persons, the operator shall provide the name, title, and address of the per- § 75.1713–4 First-aid training program; son substituted together with the name availability of instruction to all and address of the medical service, miners. medical clinic, hospital, or ambulance On or before June 30, 1971, each oper- service with which such person or per- ator of an underground coal mine shall sons are associated. make available to all miners employed (e) Each operator shall, immediately in the mine a course of instruction in after making an arrangement required first-aid conducted by the operator or under the provisions of paragraphs (a) under the auspices of the operator, and and (b) of this § 75.1713–1, or imme- such a course of instruction shall be diately after any change of such ar- made available to newly employed rangement, post at appropriate places miners within 6 months after the date at the mine the names, titles, address- of employment. es, and telephone numbers of all persons or services currently available § 75.1713–5 First-aid training program; under such arrangements to provide retraining of supervisory employ- medical assistance and transportation ees; availability to all miners. at the mine. Beginning January 1, 1971, each operator of an underground coal mine shall § 75.1713–2 Emergency communica- conduct refresher first-aid training tions; requirements. courses each calendar year for all se- (a) Each operator of an underground lected supervisory employees, and coal mine shall establish and maintain make available refresher first-aid a communication system from the training courses to all miners em- mine to the nearest point of medical ployed in the mine. assistance for use in an emergency. (b) The emergency communication § 75.1713–6 First-aid training program; system required to be maintained minimum requirements. under paragraph (a) of this § 75.1713–2 (a) All first-aid training programs re- may be established by telephone or quired under the provisions of radio transmission or by any other §§ 75.1713–3 and 75.1713–4 shall include 10 means of prompt communication to class hours of training in a course of any facility (for example, the local instruction similar to that outlined in sheriff, the State highway patrol, or ‘‘First Aid, A Bureau of Mines Instruc- local hospital) which has available the tion Manual.’’

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(b) Refresher first-aid training pro- dust tight, moisture proof containers grams required under the provisions of and such supplies shall be accessible to § 75.1713–5 shall include five class hours the miners. of refresher training in a course of instruction similar to that outlined in § 75.1714 Availability of approved self- ‘‘First Aid, A Bureau of Mines Instruc- rescue devices; instruction in use tion Manual.’’ and location. (a) Each operator shall make avail- § 75.1713–7 First-aid equipment; loca- able to each miner who goes under- tion; minimum requirements. ground, and to visitors authorized to (a) Each operator of an underground enter the mine by the operator, an ap- coal mine shall maintain a supply of proved self-rescue device or devices the first-aid equipment set forth in which is adequate to protect such per- paragraph (b) of this § 75.1713–7 at each son for 1 hour or longer. of the following locations: (b) Before any person authorized by (1) At the mine dispatcher’s office or the operator goes underground, the op- other appropriate work area on the erator shall instruct and train such surface in close proximity to the mine person in accordance with provisions entry; set forth in 30 CFR part 48. (2) At the bottom of each regularly traveled slope or shaft; however, where [43 FR 54246, Nov. 21, 1978, as amended at 53 the bottom of such slope or shaft is not FR 10336, Mar. 30, 1988; 60 FR 30401, June 8, more than 1,000 feet from the surface, 1995; 71 FR 71454, Dec. 8, 2006] such first-aid supplies may be maintained on the surface at the entrance § 75.1714–1 Approved self-rescue devices. to the mine; and (3) At a point in each working section The requirements of § 75.1714 shall be not more than 500 feet outby the active met by making available to each per- working face or faces. son referred to in that section a self- (b) The first-aid equipment required rescue device or devices, which have to be maintained under the provisions been approved by MSHA and NIOSH of paragraph (a) of this § 75.1713–7 shall under 42 CFR part 84, as follows: include at least the following: (a) A 1-hour SCSR; (1) One stretcher; (b) A SCSR of not less than 10 min- (2) One broken-back board. (If a utes and a 1-hour canister; or splint stretcher combination is used it (c) Any other self-contained breath- will satisfy the requirements of both ing apparatus which provides protec- (1) and (2)). tion for a period of 1 hour or longer and (3) 24 triangular bandages (15 if a which is approved for use by MSHA as splint-stretcher combination is used). a self-rescue device when used and (4) Eight 4-inch bandage compresses; maintained as prescribed by MSHA. (5) Eight 2-inch bandage compresses. (6) Twelve 1-inch adhesive com- [60 FR 30401, June 8, 1995] presses; (7) One foille; § 75.1714–2 Self-rescue devices; use and location requirements. (8) Two cloth blankets: (9) One rubber blanket or equivalent (a) Self-rescue devices shall be used substitute. and located as prescribed in paragraphs (10) Two tourniquets; (b) through (f) of this section. (11) One 1-ounce bottle of aromatic (b) Except as provided in paragraph spirits of ammonia or 1 dozen ammonia (c), (d), (e), or (f) of this section, self- ampules. rescue devices shall be worn or carried (12) The necessary complements of at all times by each person when un- arm and leg splints or two each inflat- derground. able plastic arm and leg splints. (c) Where the wearing or carrying of (c) All first-aid supplies required to the self-rescue device is hazardous to be maintained under the provisions of the person, it shall be placed in a read- paragraphs (a) and (b) of this § 75.1713– ily accessible location no greater than 7 shall be stored in suitable, sanitary, 25 feet from such person.

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(d) Where a person works on or devices shall be used and located as fol- around equipment, the self-rescue de- lows: vice may be placed in a readily acces- (1) Except as provided in paragraphs sible location on such equipment. (c) and (d) of this section, the device of (e) A mine operator may apply to the not less than 10 minutes shall be worn District Manager under § 75.1502 for per- or carried at all times by each person mission to place the SCSR more than when underground, and 25 feet away. (2) The one-hour canister shall be (1) The District Manager shall con- available at all times to all persons sider the following factors in deciding when underground in accordance with whether to permit an operator to place a plan submitted by the mine operator a SCSR more than 25 feet from a and approved by the District Manager. miner: When the one-hour canister is placed in (i) Distance from affected sections to a storage location, a sign made of a re- surface, flective material with the word (ii) Pitch of seam in affected sec- ‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall tions, be conspicuously posted at each stor- (iii) Height of coal seam in affected age location. Direction signs made of a sections, reflective material shall be posted (iv) Location of escapeways, leading to each storage location. (v) Proposed location of SCSRs, [43 FR 54246, Nov. 21, 1978, as amended at 60 (vi) Type of work performed by af- FR 30401, June 8, 1995; 69 FR 8108, Feb. 23, fected miners, 2004; 71 FR 12270, Mar. 9, 2006; 71 FR 71454, (vii) Degree of risk to which affected Dec. 8, 2006] miners are exposed, § 75.1714–3 Self-rescue devices; inspec- (viii) Potential for breaking into oxy- tion, testing, maintenance, repair, gen deficient atmospheres, and recordkeeping. (ix) Type of risk to which affected (a) Each operator shall provide for miners are exposed, proper inspection, testing, mainte- (x) Accident history of mine, and nance, and repair of self-rescue devices (xi) Other matters bearing upon the by a person trained to perform such safety of miners. functions. (2) Such application shall not be ap- (b) After each time a self-rescue de- proved by the District Manager unless vice is worn or carried by a person, the it provides that, while underground, all device shall be inspected for damage miners whose SCSR is more than 25 and for the integrity of its seal by a feet away shall have a FSR approved person trained to perform this func- by MSHA and NIOSH under 42 CFR tion. Self-rescue devices with broken part 84 sufficient to enable each miner seals or which are damaged so that the to get to a SCSR. device will not function properly shall (3) An operator may not obtain per- be removed from service. mission under paragraph (e) of this sec- (c) All FSRs approved by MSHA and tion to place SCSRs more than 25 feet NIOSH under 42 CFR part 84, except de- away from miners on trips into and out vices using vacuum containers as the of the mine. only method of sealing, shall be tested (f) If an SCSR is not carried out of at intervals not exceeding 90 days by the mine at the end of a miner’s shift, weighing each device on a scale or bal- the place of storage shall be approved ance accurate to within + 1 gram. A de- by the District Manager. A sign made vice that weighs more than 10 grams of reflective material with the word over its original weight shall be re- ‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall moved from service. be conspicuously posted at each SCSR (d) All SCSRs approved by MSHA and storage location. Direction signs made NIOSH under 42 CFR part 84 shall be of a reflective material shall be posted tested in accordance with instructions leading to each storage location. approved by MSHA and NIOSH. Any (g) Where devices of not less than 10 device which does not meet the speci- minutes and 1 hour are made available fied test requirements shall be removed in accordance with § 75.1714–1(b), such from service.

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(e) At the completion of each test re- (2) Storage locations shall be spaced quired by paragraphs (c) and (d) of this along each escapeway at 30-minute section the person making the tests travel distances no greater than the shall certify by signature and date that distances determined by— the tests were done. This person shall (i) Calculating the distance an aver- make a record of all corrective action age miner walks in 30 minutes by using taken. Certifications and records shall the time necessary for each miner in a be kept at the mine and made available sample of typical miners to walk a typ- on request to an authorized representa- ical length of each escapeway; or tive of the Secretary. (ii) Using the SCSR storage location (f) Self-rescue devices removed from spacing specified in the following table, service shall be repaired for return to except for escapeways with grades over service only by a person trained to per- 5 percent. form such work and only in accordance with the manufacturer’s instructions. Maximum distance [43 FR 54246, Nov. 21, 1978, as amended at 47 Average entry height between FR 14706, Apr. 6, 1982; 56 FR 1478, Jan. 14, SCSR storage loca- 1991; 60 FR 30402, June 8, 1995; 60 FR 33723, tions (in ft.) June 29, 1995] <40 in. (Crawl) ...... 2,200 § 75.1714–4 Additional self-contained >40–<50 in. (Duck Walk) ...... 3,300 self-rescuers (SCSRs). >50–<65 in. (Walk Head Bent) ...... 4,400 (a) Additional SCSRs in work places. In >65 in. (Walk Erect) ...... 5,700 addition to the requirements in (d) Additional SCSRs in hardened §§ 75.1714, 75.1714–1, 75.1714–2, and rooms. As an alternative to providing 75.1714–3 of this part, the mine operator SCSR storage locations in each shall provide the following: (1) At least one additional SCSR, escapeway, the mine operator may which provides protection for a period store SCSRs in a hardened room lo- of one hour or longer, for each person cated between adjacent escapeways. at a fixed underground work location. (1) The hardened room shall be de- (2) Additional SCSRs along the nor- signed and constructed to the same ex- mal travel routes for pumpers, exam- plosion force criteria as seals. iners, and other persons who do not (2) The hardened room shall include a have a fixed work location to be stored means to provide independent, positive at a distance an average miner could pressure ventilation from the surface walk in 30 minutes. The SCSR storage during an emergency. locations shall be determined by using (3) The District Manager shall ap- one of the methods found under para- prove the design and construction of graph (c)(2) of this section. hardened rooms in the ventilation (b) Additional SCSRs on mantrips. If a plan. mantrip or mobile equipment is used to (4) These SCSR storage locations enter or exit the mine, at least one ad- shall be spaced in accordance with ditional SCSR, which provides protec- paragraph (c) of this section. tion for a period of one hour or longer, (e) Storage location accessibility. All shall be available for each person who SCSRs required under this section uses such transportation from portal to shall be stored according to the manu- portal. facturers’ instructions, in conspicuous (c) Additional SCSRs in escapeways. locations readily accessible by each When each person underground cannot person in the mine. safely evacuate the mine within 30 (f) Storage location signs. A sign made minutes, the mine operator shall proof reflective material with the words vide additional SCSRs stored in each ‘‘SCSRs’’ or ‘‘SELF-RESCUERS’’ shall required escapeway. be conspicuously posted at each stor- (1) Each storage location shall con- age location. Direction signs made of a tain at least one SCSR, which provides reflective material shall be posted protection for a period of one hour or leading to each storage location. longer, for every person who will be inby that location. [71 FR 71454, Dec. 8, 2006]

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§ 75.1714–5 Map locations of self-con- report the change to MSHA within the tained self-rescuers (SCSR). quarter that the change occurs (Jan– The mine operator shall indicate the Mar, Apr–Jun, Jul–Sep, Oct–Dec). locations of all stored SCSRs on the (b) Reporting SCSR problems. A mine mine maps required by §§ 75.1200 and operator shall report to MSHA any de- 75.1505 of this part. fect, performance problem, or malfunction with the use of an SCSR. The re- [71 FR 71454, Dec. 8, 2006] port shall include a detailed description of the problem and, for each SCSR § 75.1714–6 Emergency tethers. involved, the information required by At least one tether, which is a dura- paragraph (a)(1) of this section. ble rope or equivalent material de- (c) Retention of problem SCSRs. The signed to permit members of a mine mine operator shall preserve and retain crew to link together while evacuating each SCSR reported under paragraph the mine during an emergency, shall be (b) of this section for 60 days after re- provided and stored with the additional porting the problem to MSHA. SCSRs on the fixed work location and on the mobile equipment required in [71 FR 71454, Dec. 8, 2006] §§ 75.1714–4(a)(1) and (b) of this part. § 75.1715 Identification check system. [71 FR 71454, Dec. 8, 2006] [STATUTORY PROVISIONS] § 75.1714–7 Multi-gas detectors. Each operator of a coal mine shall es- (a) Availability. A mine operator shall tablish a check-in and check-out sys- provide an MSHA-approved, handheld, tem which will provide positive identi- multi-gas detector that can measure fication of every person underground, methane, oxygen, and carbon monoxide and will provide an accurate record of to each group of underground miners the persons in the mine kept on the and to each person who works alone, surface in a place chosen to minimize such as pumpers, examiners, and outby the danger of destruction by fire or miners. other hazard. Such record shall bear a (b) Qualified person. At least one per- number identical to an identification son in each group of underground min- check that is securely fastened to the ers shall be a qualified person under lamp belt worn by the person under- § 75.150 of this part and each person who ground. The identification check shall works alone shall be trained to use the be made of a rust resistant metal of multi-gas detector. not less than 16 gauge. (c) Maintenance and calibration. Multi-gas detectors shall be main- § 75.1716 Operations under water. tained and calibrated as specified in § 75.320 of this part. [STATUTORY PROVISIONS] [71 FR 71454, Dec. 8, 2006] Whenever an operator mines coal from a coal mine opened after March § 75.1714–8 Reporting SCSR inventory 30, 1970, or from any new working sec- and malfunctions; retention of tion of a mine opened prior to such SCSRs. date, in a manner that requires the (a) SCSR inventory. A mine operator construction, operation, and mainte- shall submit to MSHA a complete in- nance of tunnels under any river, ventory of all SCSRs at each mine. stream, lake, or other body of water, New mines shall submit the inventory that is, in the judgment of the Sec- within 3 months of beginning oper- retary, sufficiently large to constitute ation. a hazard to miners, such operator shall (1) The inventory shall include— obtain a permit from the Secretary (i) Mine name, MSHA mine ID num- which shall include such terms and ber, and mine location; and conditions as he deems appropriate to (ii) For each SCSR unit, the manu- protect the safety of miners working or facturer, the model type, the date of passing through such tunnels from manufacture, and the serial number. caveins and other hazards. Such per- (2) In the event that a change in the mits shall require, in accordance with inventory occurs, a mine operator shall a plan to be approved by the Secretary,

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that a safety zone be established be- (e) A profile map showing the type of neath and adjacent to such body of strata and the distance in elevation be- water. No plan shall be approved unless tween the coal bed and the river, there is a minimum of cover to be de- stream, lake or other body of water in- termined by the Secretary, based on volved. The type of strata shall be de- test holes drilled by the operator in a termined by core test drill holes as pre- manner to be prescribed by the Sec- scribed by the Coal Mine Safety Dis- retary. No such permit shall be re- trict Manager. quired in the case of any new working section of a mine which is located § 75.1716–4 Issuance of permits. under any water resource reservoir If the Coal Mine Safety District Man- being constructed by a Federal agency ager determines that the proposed min- on December 30, 1969, the operator of ing operations under water can be safe- which is required by such agency to op- ly conducted, he shall issue a permit erate in a manner that protects the for the conduct of such operations safety of miners working in such sec- under such conditions as he deems nection from cave-ins and other hazards. essary to protect the safety of miners [35 FR 17890, Nov. 20, 1970, as amended at 60 engaged in those operations. FR 33723, June 29, 1995] § 75.1717 Exemptions. § 75.1716–1 Operations under water; notification by operator. [STATUTORY PROVISIONS] An operator planning to mine coal No notice under § 75.1716–1 and no per- from coal mines opened after March 30, mit under § 75.1716–2 shall be required 1970, or from working sections in mines in the case of any new working section opened prior to such date, and in such of a mine which is located under any manner that mining operations will be water resource reservoir being con- conducted, or tunnels constructed, structed by a Federal agency as of De- under any river, stream, lake, or other cember 30, 1969, and where the operator body of water, shall give notice to the is required by such agency to operate Coal Mine Safety District Manager in in a manner that adequately protects the district in which the mine is lo- the safety of miners. cated prior to the commencement of such mining operations. § 75.1718 Drinking water.

§ 75.1716–2 Permit required. [STATUTORY PROVISIONS] If in the judgment of the Coal Mine An adequate supply of potable water Safety District Manager the proposed shall be provided for drinking purposes mining operations referred to in in the active workings of the mine, and § 75.1716–1 constitute a hazard to min- such water shall be carried, stored, and ers, he shall promptly so notify the op- otherwise protected in sanitary con- erator that a permit is required. tainers.

§ 75.1716–3 Applications for permits. § 75.1718–1 Drinking water; quality. An application for a permit required (a) Potable water provided in accord- under this section shall be filed with ance with the provisions of § 75.1718 the Coal Mine Safety District Manager shall meet the applicable minimum and shall contain the following general health requirements for drinking water information: established by the State or community (a) Name and address of the com- in which the mine is located. pany. (b) Where no state or local health re- (b) Name and address of the mine. quirements apply to drinking water or (c) Projected mining and ground sup- where no state or local minimum port plans. health requirements exist, drinking (d) A mine map showing the locations water provided in accordance with the of the river, stream, lake, or other provisions of § 75.1718 shall contain a body of water and its relation to the lo- minimum of 0.2 milligrams of free chlo- cation of all working places. rine per liter of water.

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§ 75.1719 Illumination; purpose and graphs (e)(1) through (e)(6) of this sec- scope of §§ 75.1719 through 75.1719– tion. 4; time for compliance. (1) Continuous miners and coal-loading (a) Section 317(e) of the Act (30 U.S.C. equipment. In working places in which 877(e)) directs and authorizes the Sec- continuous miners and coal-loading retary to propose and promulgate equipment are operated, the areas standards under which all working which shall be illuminated shall be as places in a mine shall be illuminated follows: by permissible lighting while persons (i) The face, and are working in such places §§ 75.1719 (ii) The ribs, roof, floor, and exposed through 75.1719–4 prescribe the require- surface of mining equipment, which are ments for illumination of working between the face and the inby end of places in underground coal mines while the shuttle car or other conveying persons are working in such places and equipment while in position to receive while self-propelled mining equipment material. is operated in the working place. (2) Self-loading haulage equipment used (b) Mine operators shall comply with as a loading machine. In working places §§ 75.1719 through 75.1719–4 not later in which self-loading haulage equip- than July 1, 1978. ment is operated to load material, the areas which shall be illuminated shall [41 FR 43534, Oct. 1, 1976, as amended at 43 FR be as follows: 13564, Mar. 31, 1978] (i) The face, and (ii) The ribs, roof, floor, and exposed § 75.1719–1 Illumination in working surfaces of mining equipment, which places. are between the face and a point 5 feet (a) Each operator of an underground outby the machine. coal mine shall provide each working (3) Cutting and drilling equipment. In place in the mine with lighting as pre- working places in which cutting or scribed in §§ 75.1719–1 and 75.1719–2 while drilling equipment is operated, the self-propelled mining equipment is op- areas which shall be illuminated shall erated in the working place. be as follows: (b) Self-propelled mining equipment; (i) The ribs, roof, floor, and exposed definition. For the purposes of §§ 75.1719 surfaces of mining equipment, which through 75.1719–4, ‘‘self-propelled min- are between the face and a point 5 feet ing equipment’’ means equipment outby the machine. which possesses the capability of mov- (4) Shortwall and longwall mining ing itself or its associated components equipment. In working places in which from one location to another by elec- shortwall or longwall mining equip- tric, hydraulic, pneumatic, or mechan- ment is operated, the areas which shall ical power supplied by a source located be illuminated shall be as follows: on the machine or transmitted to the (i) The area for the length of the self- machine by cables, ropes, or chains. advancing roof suport system and (c) The lighting prescribed in this which is between the gob-side of the section shall be in addition to that pro- travelway and the side of the block of vided by personal cap lamps. coal from which coal is being ex- (d) The luminous intensity (surface tracted, and brightness) of surfaces that are in a (ii) The control station, and the head miner’s normal field of vision of areas piece and tail piece of the face con- in working places that are required to veyor, and be lighted shall be not less than 0.06 (iii) The roof and floor for a distance footlamberts when measured in accord- of 5 feet horizontally from the control ance with § 75.1719–3. station, head piece and tail piece. (e) When self-propelled mining equip- (5) Roof bolting equipment. In working ment specified in paragraphs (e)(1) places in which roof bolting equipment through (e)(6) of this section is oper- is operated, the areas which shall be il- ated in a working place, the areas luminated shall be as follows: within a miner’s normal field of vision (i) Where the distance from the floor, to which shall be illuminated in the work- the roof is 5 feet, or less: the face, ribs, ing place shall be as prescribed in para- roof, floor, and exposed surfaces of

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mining equipment, which are within an § 75.1719–2 Lighting fixtures; require- area the perimeter of which is a dis- ments. tance of 5 feet from the machine, when (a) Lighting fixtures shall be permis- measured parallel to the floor. sible. (ii) Where the distance from the floor to (b) Lighting fixtures may be installed the roof is more than 5 feet: the face, on self-propelled machines or may be ribs, roof, floor, and exposed surfaces of stationary lighting fixtures. mining equipment, which are within an (c)(1) Electrically operated lighting area the perimeter of which from the fixtures shall be energized by direct front and sides of the machine is a dis- current, or by sinusoidal full wave al- tance equal to the distance from the ternating current not less than 50 cy- floor to the roof and from the rear of cles per second (100 pulses per second), the machine a distance of 5 feet, when or by an equivalent power source that measured parallel to the floor. causes no greater flicker. (6) Other self-propelled equipment. Un- (2) Alternating current circuits sup- less the entire working place is illumi- plying power to stationary lighting fix- nated by stationary lighting equip- tures shall contain conductors ener- ment, in working places in which self- gized at voltages not greater than 70 propelled equipment is operated, other volts to ground. Alternating current than equipment specified in paragraphs circuits, energized at 100 volts or more (e)(1) through (e)(5) of this section, illu- and used to supply power to staionary mination shall be provided as follows: lighting fixtures, shall originate at a (i) Luminaires shall be installed on transformer having a center or neutral each machine operated in the working tap grounded to earth through a proper place which shall illuminate a face or resistor, which shall be designed to rib coal surface which is within 10 feet limit fault current to not more than 5 amperes. A grounding circuit in ac- of the front and the rear of the ma- cordance with § 75.701–4 shall orignate chine to a luminous intensity of not at the grounded terminal of the less than 0.06 footlamberts, and grounding resistor and extend along (ii) The height and width of the area with the power conductors and serve as of the coal surface which shall be illu- a grounding conductor for the frames minated shall equal the height and of all equipment receiving power from width, respectively, of the machine on the circuit. The ground fault current which the luminaires are installed, and rating of grounding resistors shall (iii) The luminaires in the direction meet the ‘‘extended time rating’’ set of travel shall be operated at all times forth in the Institute of Electrical and the equipment is being trammed in the Electronics Engineers, Inc. Standard working place. No. 32 (IEEE Std. 32–1972) which is (f) The Administrator, Coal Mine hereby incorporated by reference and Health and Safety, MSHA, may specify made a part hereof. The incorporated other areas in a working place to be il- publication is available for examina- luminated for the protection of miners tion at each MSHA Coal Mine Safety while self-propelled mining equipment and Health district office, and may be is being operated in the working place. obtained from the Institute of Elec- (g) Surface brightness of floor, roof, trical and Electronics Engineers, Inc., Publications Office, 10662 Los Vaqueros coal and machine surfaces in the nor- Circle, P.O. Box 3014 Los Alamitos, CA mal visual field of a miner shall not 90720–1264 Telephone: 800–272–6657 (toll vary more than 50 percent between ad- free); http://www.ieee.org. jacent fields of similar surface reflec- (3) Machine-mounted lighting fix- tance, and the maximum surface tures shall be electrically grounded to brightness of such surface shall not ex- the machine by a separate grounding ceed 120 footlamberts when measured conductor in compliance with § 75.701–4. in accordance with § 75.1719–3. (d) Direct current circuits in excess [41 FR 43534, Oct. 1, 1976, as amended at 42 FR of a nominal voltage of 300 volts shall 18859, Apr. 11, 1977; 43 FR 43458, Sept. 26, 1978; not be used to supply power to sta- 47 FR 28096, June 29, 1982] tionary light fixtures.

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(e) Cables conducting power to sta- vicinity of shearers, plows, or contin- tionary lighting fixtures from both al- uous miners, the equipment shall be ternating and direct current power idle while measurements are being sources, other than intrinsically safe made. devices, shall be considered trailing ca- (3) In areas of working places speci- bles, and shall meet rhe requirements fied in § 75.1719–1(e)(5) luminous inten- of Subpart G of this part. In addition, sity measurements of the face, ribs, such cables shall be protected against roof, floor, and exposed surfaces of overloads and short circuits by a suit- mining equipment, shall be made with able circuit breaker or other device ap- the machine idle and located in the approved by the Secretary. Circuit breakers or other device approved by the proximate center of the working place Secretary protecting trailing cables re- with the drilling head toward the face ceiving power from resistance grounded and a distance from the face of 5 feet, circuits shall be equipped with a or the distance from the floor to the ground trip arrangement which shall roof, whichever is applicable. When the be designed to deenergize the circuit at machine is located in the center of the not more than 50% of the available working place and the surfaces of the fault current. ribs to be illuminated are not within (f) Before shunts are removed from the perimeter of the area determined blasting caps, lighting fixtures and as- in accordance with § 75.1719–1(e)(5), the sociated cables located in the same machine shall be positioned the appli- working place shall be deenergized. cable distance from the face and each Furthermore, lighting fixtures shall be rib and luminous intensity measure- removed out of the line of blast and not ments made for each rib, provided, less than 50 feet from the blasting oper- however, that luminous intensity ation unless otherwise protected measurements may be made of the against flying debris. face, roof, floor, and exposed surfaces (g) Lighting fixtures shall be de- of mining equipment with the machine signed and installed to minimize dis- so located without locating the ma- comfort glare. chine in the center of the working [41 FR 43534, Oct. 1, 1976, as amended at 71 FR place. 16669, Apr. 3, 2006] (4) In areas of working places speci- § 75.1719–3 Methods of measurement; fied in § 75.1719–1(e)(6), luminous inten- light measuring instruments. sity measurements of a coal surface shall be made with the machine idle (a) Compliance with § 75.1719–1(d) shall be determined by MSHA by meas- and located in the approximate center uring luminous intensity (surface of the working place with the appro- brightness). priate end toward the face and not less (b) In measuring luminous intensity than 9 feet nor more than 10 feet from the following procedures shall be used: the face. (1) In areas of working places speci- (5) The area of surfaces to be meas- fied in §§ 75.1719.1(e)(1) through 75.1719– ured shall be divided into round or 1(e)(3) luminous intensity measure- square fields having an area of not less ments of the face, ribs, roof, floor, and than 3 nor more than 5 square feet as exposed surfaces of mining equipment, illustrated by the following figure: shall be made with the machine idle and located in the approximate center of the working place with the cutting, loading, or drilling head toward the face and not more than 3 feet from the face. (2) In areas of working places specified in § 75.1719–1(e)(4) luminous intensity measurements may be made at any time longwall or shortwall mining equipment is operated except that when measurements are made in the

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(6) Measurements shall be taken with the photometer held approximately perpendicular to the surface being (8) Measurements shall not be made measured and a sufficient distance where shadows are cast by roof control from the surface to allow the light posts, ventilation equipment, or other sensing element in the instrument to obstructions necessary to insure safe receive reflected light from a field of mining conditions. not less than 3 nor more than 5 square (9) Where machine-mounted light fix- feet. The luminous intensity of each tures are used on equipment, except such field shall be not less than 0.06 self advancing roof support systems, footlambert. measurements shall not be made of (7) In areas of working places where surfaces on or within 1 foot of a self- clearances are restricted to the extent propelled machine. that the photometer cannot be held a (c) For the purpose of making illu- sufficient distance from the surface to mination measurements, an authorized allow the light sensing element in the representative of the Secretary may re- instrument to receive reflected light quire the installation of temporary from a field having an area of at least roof supports or the removal of the 3 square feet, luminous intensity shall equipment to a similar working place be considered as the average of four in which permanent roof supports have uniformly spaced readings taken at the been installed. corners and within a square field hav- (d) Light measuring instruments ing an area of approximately 4 square shall be properly calibrated and main- feet. In such instances, the area of each tained. Instruments shall be calibrated of the individual readings shall not ex- against standards traceable to the Na- ceed 100 square inches. The average of tional Institute of Standards and Tech- the four readings shall be not less than nology (Formerly the National Bureau 0.06 footlambert. The method of meas- of Standards) and color corrected to urement is illustrated by the following the Commission Internationale de figure: l’Eclairage (CIE) Spectral Luminous Curve. The CIE Spectral Luminous Curve is as follows:

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ground coal mine shall be required to wear the following protective clothing and devices: (a) Protective clothing or equipment and face-shields or goggles when welding, cutting, or working with molten metal or when other hazards to the eyes exist from flying particles. (b) Suitable protective clothing to cover those parts of the body exposed to injury when handling corrosive or toxic substances or other materials which might cause injury to the skin. (c) Protective gloves when handling materials or performing work which might cause injury to the hands; however, gloves shall not be worn where they would create a greater hazard by becoming entangled in the moving parts of equipment. (d) A suitable hard hat or hard cap. If a hard hat or hard cap is painted, non- [41 FR 43534, Oct. 1, 1976, as amended at 71 FR metallic based paint shall be used. 16669, Apr. 3, 2006] (e) Suitable protective footwear. § 75.1719–4 Mining machines, cap [36 FR 19497, Oct. 7, 1971, as amended at 39 FR lamps; requirements. 7175, Feb. 25, 1974] (a) Paint used on exterior surfaces of mining machines shall have a min- § 75.1720–1 Distinctively colored hard hats, or hard caps; identification for imum reflectance of 30 percent, except newly employed, inexperienced cab interiors and other surfaces which miners. might adversely affect visibility. Hard hats or hard caps distinctively (b) When stationary light fixtures are different in color from those worn by used, red reflectors mounted in protec- experienced miners shall be worn by tive frames or reflecting tape shall be each newly employed, inexperienced installed on each end of mining ma- miner for at least one year from the chines, except that continuous mining date of his initial employment as a machines, loaders, and cutters need miner or until he has been qualified or only have such reflectors or tape on certified as a miner by the State in the outby end. Reflectors or reflecting which he is employed. tape shall have an area of not less than 10 square inches. [39 FR 7175, Feb. 25, 1974] (c) Each person who goes underground shall be required to wear an ap- § 75.1721 Opening of new underground proved personal cap lamp or an equiva- coal mines, or reopening and reactivating of abandoned or deactivated lent portable light. coal mines, notification by the oper- (d) Each person who goes under- ator; requirements. ground shall be required to wear a hard (a) Each operator of a new under- hat or hard cap which shall have a min- ground coal mine, and a mine which imum of 6 square inches of reflecting has been abandoned or deactivated and tape or equivalent paint or material on is to be reopened or reactivated, shall each side and back. prior to opening, reopening or reacti- [41 FR 43534, Oct. 1, 1976] vating the mine notify the Coal Mine Health and Safety District Manager for § 75.1720 Protective clothing; require- the district in which the mine is lo- ments. cated of the approximate date of the On and after the effective date of this proposed or actual opening of such § 75.1720 each miner regularly employed mine. Thereafter, and as soon as prac- in the active workings of an under- ticable, the operator of such mine shall

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submit all preliminary plans in accord- § 75.1722 Mechanical equipment ance with paragraphs (b) and (c) of this guards. section to the District Manager and (a) Gears; sprockets; chains; drive, the operator shall not develop any part head, tail, and takeup pulleys; of the coalbed in such mine unless and flywheels; couplings, shafts; sawblades; until all preliminary plans have been fan inlets; and similar exposed moving approved. machine parts which may be contacted (b) The preliminary plans required to by persons, and which may cause in- be submitted by the operator to the jury to persons shall be guarded. District Manager shall be in writing (b) Guards at conveyor-drive, con- and shall contain the following: veyor-head, and conveyor-tail pulleys (1) The name and location of the pro- shall extend a distance sufficient to posed mine and the Mine Safety and prevent a person from reaching behind Health Administration mine identifica- the guard and becoming caught be- tion number, if known; tween the belt and the pulley. (2) The name and address of the mine (c) Except when testing the machin- operator(s); ery, guards shall be securely in place (3) The name and address of the prin- while machinery is being operated. cipal official designated by the oper- [38 FR 4976, Feb. 23, 1973] ator as the person who is in charge of health and safety at the mine; § 75.1723 Stationary grinding ma- (4) The identification and approxi- chines; protective devices. mate height of the coalbed to be devel- (a) Stationary grinding machines oped; other than special bit grinders shall be (5) The system of mining to be em- equipped with: ployed; (1) Peripheral hoods (less than 90° (6) A proposed roof control plan con- throat openings) capable of with- taining the information specified in standing the force of a bursting wheel. § 75.220. (2) Adjustable tool rests set as close (7) A proposed mine ventilation plan as practical to the wheel. containing the information specified in (3) Safety washers. §§ 75.371 and 75.372; (b) Grinding wheels shall be operated (8) A proposed plan for sealing within the specifications of the manu- worked-out areas containing the infor- facturer of the wheel. mation specified in §§ 75.371 and 75.372. (c) Face shields or goggles, in good (9) A proposed program for searching condition, shall be worn when oper- miners for smoking materials in ac- ating a grinding wheel. cordance with the provisions of [38 FR 4976, Feb. 23, 1973] § 75.1702; and, (10) A proposed plan for emergency § 75.1724 Hand-held power tools; safety medical assistance and emergency devices. communication in accordance with the Hand-held power tools shall be provisions of §§ 75.1713–1 and 75.1713–2. equipped with controls requiring con- (c) The preliminary plans required to stant hand or finger pressure to oper- be submitted by the operator to the ate the tools or shall be equipped with District Manager shall be in writing friction or other equivalent safety de- and shall contain the following: vices. (1) The proposed training plan con- [38 FR 4976, Feb. 23, 1973] taining the information specified in §§ 48.3 and 48.23 of this chapter, and § 75.1725 Machinery and equipment; (2) A proposed plan for training and operation and maintenance. retraining certified and qualified per- (a) Mobile and stationary machinery sons containing the information speci- and equipment shall be maintained in fied in § 75.160–1. safe operating condition and machin- [44 FR 9380, Feb. 13, 1979, as amended at 47 ery or equipment in unsafe condition FR 23641, May 28, 1982; 57 FR 20929, May 15, shall be removed from service imme- 1992] diately.

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(b) Machinery and equipment shall be § 75.1729 Welding operations. operated only by persons authorized to Welding operations shall be shielded operate such machinery or equipment. and the area shall be well ventilated. (c) Repairs or maintenance shall not be performed on machinery until the [38 FR 4976, Feb. 23, 1973] power is off and the machinery is blocked against motion, except where § 75.1730 Compressed air; general; compressed air systems. machinery motion is necessary to make adjustments. (a) All pressure vessels shall be con- (d) Machinery shall not be lubricated structed, installed, and maintained in manually while in motion, unless accordance with the standards and equipped with extended fittings or specifications of Section VIII ‘‘Unfired cups. Pressure Vessels,’’ of the American So- ciety of Mechanical Engineers Boiler [38 FR 4976, Feb. 23, 1973] and Pressure Vessel Code (1971), which is hereby incorporated by reference and § 75.1726 Performing work from a raised position; safeguards. made a part hereof. This document may be purchased from the American (a) Men shall not work on or from a Society of Mechanical Engineers, 22 piece of mobile equipment in a raised Law Drive, P.O. Box 2900, Fairfield, position until it has been blocked in New Jersey 07007, Phone: 800–843–2763 place securely. This does not preclude (toll free); http://www.asme.org; and it is the use of equipment specifically de- available for examination in every signed as elevated mobile work plat- MSHA Coal Mine Safety and Health forms. district office. (b) No work shall be performed under (b) Compressors and compressed-air machinery or equipment that has been receivers shall be equipped with auto- raised until such machinery or equip- matic pressure-relief valves, pressure ment has been securely blocked in po- gages, and drain valves. sition. (c) Repairs involving the pressure [38 FR 4976, Feb. 23, 1973] system of compressors, receivers, or compressed-air-powered equipment § 75.1727 Drive belts. shall not be attempted until the pres- (a) Drive belts shall not be shifted sure has been relieved from that part of while in motion unless the machines the system to be repaired. are provided with mechanical shifters. (d) At no time shall compressed air (b) Belt dressing shall not be applied be directed toward a person. When while belts are in motion except where compressed air is used, all necessary it can be applied without endangering a precautions shall be taken to protect person. persons from injury. (e) Safety chains, suitable locking [38 FR 4976, Feb. 23, 1973] devices, or automatic cut-off valves shall be used at connections to ma- § 75.1728 Power-driven pulleys. chines of high-pressure hose lines of (a) Belts, chains, and ropes shall not three-fourths of an inch inside diame- be guided onto power-driven moving ter or larger, and between high-pres- pulleys, sprockets, or drums with the sure hose lines of three-fourths of an hands except on slow-moving equip- inch inside diameter or larger, where a ment especially designed for hand feed- connection failure would create a haz- ing. ard. For purposes of this paragraph, (b) Pulleys of conveyors shall not be high-pressure means pressure of 100 cleaned manually while the conveyor is p.s.i. or more. in motion. (c) Coal spilled beneath belt conveyor [38 FR 4976, Feb. 23, 1973, as amended at 71 FR 16669, Apr. 3, 2006] drives or tail pieces shall not be removed while the conveyor is in motion, § 75.1731 Maintenance of belt con- except where such coal can be removed veyors and belt conveyor entries. without endangering persons. (a) Damaged rollers, or other dam- [38 FR 4976, Feb. 23, 1973] aged belt conveyor components, which

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pose a fire hazard must be immediately nents and miner-wearable components. repaired or replaced. All other dam- The system must: aged rollers, or other damaged belt (1) Cause a machine, which is conveyor components, must be repaired tramming from place-to-place or repo- or replaced. sitioning, to stop before contacting a (b) Conveyor belts must be properly miner except for a miner who is in the aligned to prevent the moving belt on-board operator’s compartment; from rubbing against the structure or (2) Provide an audible and visual components. warning signal on the miner-wearable (c) Materials shall not be allowed in component and a visual warning signal the belt conveyor entry where the ma- on the machine that alert miners be- terial may contribute to a frictional fore the system causes a machine to heating hazard. stop. These warning signals must be (d) Splicing of any approved conveyor distinguishable from other signals; belt must maintain flame-resistant (3) Provide a visual signal on the ma- properties of the belt. chine that indicates the machine- mounted components are functioning [73 FR 80616, Dec. 31, 2008] properly; (4) Prevent movement of the machine § 75.1732 Proximity detection systems. if any machine-mounted component of Operators must install proximity de- the system is not functioning properly. tection systems on certain mobile ma- However, a system with any machine- chines. mounted component that is not func- (a) Machines covered. Operators must tioning properly may allow machine equip continuous mining machines, ex- movement if it provides an audible or cept full-face continuous mining ma- visual warning signal, distinguishable chines, with proximity detection sys- from other signals, during movement. tems by the following dates. For prox- Such movement is permitted only for imity detection systems with miner- purposes of relocating the machine wearable components, the mine oper- from an unsafe location for repair; ator must provide a miner-wearable (5) Be installed to prevent inter- component to be worn by each miner ference that adversely affects perform- on the working section by the fol- ance of any electrical system; and lowing dates. (6) Be installed and maintained in (1) Continuous mining machines proper operating condition by a person manufactured after March 16, 2015 must trained in the installation and mainte- meet the requirements in this section nance of the system. no later than November 16, 2015. These (c) Proximity detection system checks. machines must meet the requirements Operators must: in this section when placed in service (1) Designate a person who must per- with a proximity detection system. form a check of machine-mounted com- (2) Continuous mining machines ponents of the proximity detection sys- manufactured and equipped with a tem to verify that components are in- proximity detection system on or be- tact, that the system is functioning fore March 16, 2015 must meet the re- properly, and take action to correct de- quirements in this section no later fects— than September 16, 2016. (i) At the beginning of each shift (3) Continuous mining machines when the machine is to be used; or manufactured and not equipped with a (ii) Immediately prior to the time proximity detection system on or be- the machine is to be operated if not in fore March 16, 2015 must meet the re- use at the beginning of a shift; or quirements in this section no later (iii) Within 1 hour of a shift change if than March 16, 2018. These machines the shift change occurs without an must meet the requirements in this interruption in production. section when placed in service with a (2) Check for proper operation of proximity detection system. miner-wearable components at the be- (b) Requirements for a proximity detec- ginning of each shift that the compo- tion system. A proximity detection sys- nents are to be used and correct defects tem includes machine-mounted compo- before the components are used.

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(d) Certifications and records. The op- E119–88 ‘‘Standard Test Methods for erator must make and retain certifi- Fire Tests of Building Construction cations and records as follows: and Materials’’ is incorporated by ref- (1) At the completion of the check of erence and may be inspected at any machine-mounted components required MSHA Coal Mine Safety and Health under paragraph (c)(1) of this section, a District Office; at MSHA’s Office of certified person under § 75.100 must cer- Standards, Regulations, and Variances, tify by initials, date, and time that the 201 12th Street South, Arlington, VA check was conducted. Defects found as 22202–5452; 202–693–9440; or at the Na- a result of the check, including correc- tional Archives and Records Adminis- tive actions and dates of corrective ac- tration (NARA). For information on tions, must be recorded before the end the availability of this material at of the shift; NARA, call 202–741–6030, or go to: http:// (2) Make a record of the defects found www.archives.gov/federallregister/ as a result of the check of miner-wear- codeloflfederallregulations/ able components required under para- ibrllocations.html. This incorporation graph (c)(2) of this section, including by reference was approved by the Di- corrective actions and dates of correc- rector of the Federal Register in active actions; cordance with 5 U.S.C. 552(a) and 1 CFR (3) Make a record of the persons part 51. In addition, copies of the docu- trained in the installation and mainte- ment may be purchased from the nance of proximity detection systems American Society for Testing and Ma- required under paragraph (b)(6) of this terials (ASTM), 100 Barr Harbor Drive, section; P.O. Box C700, West Conshohocken, PA, (4) Maintain records in a secure book 19428–2959; 610–832–9500; http:// or electronically in a secure computer www.astm.org. system not susceptible to alteration; Permanent underground diesel fuel stor- and age facility. A facility designed and con- (5) Retain records for at least one structed to remain at one location for year and make them available for in- the storage or dispensing of diesel fuel, spection by authorized representatives which does not move as mining proof the Secretary and representatives of gresses. miners. Safety can. A metal container intended for storage, transport or dis- [80 FR 2202, Jan. 15, 2015] pensing of diesel fuel, with a nominal capacity of 5 gallons, listed or approved Subpart S [Reserved] by a nationally recognized independent testing laboratory. Subpart T—Diesel-Powered Temporary underground diesel fuel stor- Equipment age area. An area of the mine provided for the short-term storage of diesel fuel SOURCE: 61 FR 55527, Oct. 25, 1996, unless in a fuel transportation unit, which otherwise noted. moves as mining progresses. [35 FR 17890, Nov. 20, 1970, as amended at 67 § 75.1900 Definitions. FR 38386, June 4, 2002; 71 FR 16669, Apr. 3, The following definitions apply in 2006; 80 FR 52992, Sept. 2, 2015] this subpart. Diesel fuel tank. A closed metal vessel § 75.1901 Diesel fuel requirements. specifically designed for the storage or (a) Diesel-powered equipment shall transport of diesel fuel. be used underground only with a diesel Diesel fuel transportation unit. A self- fuel having a sulfur content no greater propelled or portable wheeled vehicle than 0.05 percent and a flash point of used to transport a diesel fuel tank. 100 °F (38 °C) or greater. Upon request, Noncombustible material. A material the mine operator shall provide to an that will continue to serve its intended authorized representative of the Sec- function for 1 hour when subjected to a retary evidence that the diesel fuel fire test incorporating an ASTM E119– purchased for use in diesel-powered 88 time/temperature heat input, or equipment underground meets these re- equivalent. The publication ASTM quirements.

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(b) Flammable liquids shall not be (e) Permanent underground diesel added to diesel fuel used in diesel-pow- fuel storage facilities must not be lo- ered equipment underground. cated within the primary escapeway. (c) Only diesel fuel additives that have been registered by the Environ- § 75.1903 Underground diesel fuel stor- mental Protection Agency may be used age facilities and areas; construction and safety precautions. in diesel-powered equipment underground. (a) Permanent underground diesel fuel storage facilities must be— § 75.1902 Underground diesel fuel stor- (1) Constructed of noncombustible age—general requirements. materials, including floors, roofs, roof (a) All diesel fuel must be stored in: supports, doors, and door frames. Ex- (1) Diesel fuel tanks in permanent posed coal within fuel storage areas underground diesel fuel storage facili- must be covered with noncombustible ties; materials. If bulkheads are used they (2) Diesel fuel tanks on diesel fuel must be tightly sealed and must be transportation units in permanent un- built of or covered with noncombus- derground diesel fuel storage facilities tible materials; or in temporary underground fuel stor- (2) Provided with either self-closing age areas; or doors or a means for automatic enclo- (3) Safety cans. sure; (b) The total capacity of stationary (3) Provided with a means for per- diesel fuel tanks in permanent under- sonnel to enter and exit the facility ground diesel fuel storage facilities after closure; must not exceed 1000 gallons. (4) Ventilated with intake air that is (c)(1) Only one temporary under- coursed into a return air course or to ground diesel fuel storage area is per- the surface and that is not used to ven- mitted for each working section or in tilate working places, using ventila- each area of the mine where equipment tion controls meeting the requirements is being installed or removed. of § 75.333(e); (2) The temporary underground diesel (5) Equipped with an automatic fire suppression system that meets the re- fuel storage area must be located— quirements of § 75.1912. Actuation of (i) Within 500 feet of the loading the automatic fire suppression system point; shall initiate the means for automatic (ii) Within 500 feet of the projected enclosure; loading point where equipment is being (6) Provided with a means of contain- installed; or ment capable of holding 150 percent of (iii) Within 500 feet of the last load- the maximum capacity of the fuel storing point where equipment is being re- age system; and moved. (7) Provided with a competent con- (3) No more than one diesel fuel crete floor or equivalent to prevent transportation unit at a time shall be fuel spills from saturating the mine parked in the temporary underground floor. diesel fuel storage area. (b) Permanent underground diesel (d) Permanent underground diesel fuel storage facilities and temporary fuel storage facilities and temporary underground diesel fuel storage areas underground diesel fuel storage areas must be— must be— (1) Equipped with at least 240 pounds (1) At least 100 feet from shafts, of rock dust and provided with two slopes, shops, or explosives magazines; portable multipurpose dry chemical (2) At least 25 feet from trolley wires type (ABC) fire extinguishers that are or power cables, or electric equipment listed or approved by a nationally rec- not necessary for the operation of the ognized independent testing laboratory storage facilities or areas; and and have a 10A:60B:C or higher rating. (3) In a location that is protected Both fire extinguishers must be easily from damage by other mobile equip- accessible to personnel, and at least ment. one fire extinguisher must be located

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outside of the storage facility or area structed of noncombustible material so upwind of the facility, in intake air; or that the tanks are at least 12 inches (2) Provided with three portable mul- above the floor. tipurpose dry chemical type (ABC) fire (b) Underground diesel fuel tanks extinguishers that are listed or ap- must be provided with— proved by a nationally recognized inde- (1) Devices for emergency venting dependent testing laboratory and have a signed to open at a pressure not to ex- 10A:60B:C or higher rating. All fire exceed 2.5 psi according to the fol- tinguishers must be easily accessible to lowing— personnel, and at least one fire extin- (i) Tanks with a capacity greater guisher must be located outside of the than 500 gallons must have an emer- storage facility or area upwind of the gency venting device whose area is facility, in intake air. equivalent to a pipe with a nominal in- (3) Identified with conspicuous mark- side diameter of 5 inches or greater; ings designating diesel fuel storage; and and (ii) Tanks with a capacity of 500 gal- (4) Maintained to prevent the accu- lons or less must have an emergency mulation of water. venting device whose area is equivalent (c) Welding or cutting other than to a pipe with a nominal inside diame- that performed in accordance with ter of 4 inches or greater. paragraph (d) of this section shall not (2) Tethered or self-closing caps for be performed within 50 feet of a perma- stationary tanks in permanent under- nent underground diesel fuel storage ground diesel fuel storage facilities and facility or a temporary underground self-closing caps for diesel fuel tanks diesel fuel storage area. on diesel fuel transportation units; (d) When it is necessary to weld, cut, (3) Vents to permit the free discharge or solder pipelines, tanks, or other con- of liquid, at least as large as the fill or tainers that may have contained diesel withdrawal connection, whichever is fuel, these practices shall be followed: larger, but not less than 11⁄4 inch nomi- (1) Cutting or welding shall not be nal inside diameter; performed on or within pipelines, (4) Liquid tight connections for all tanks, or other containers that have tank openings that are— contained diesel fuel until they have (i) Identified by conspicuous mark- been thoroughly purged and cleaned or ings that specify the function; and inerted and a vent or opening is pro- (ii) Closed when not in use. vided to allow for sufficient release of (5) Vent pipes that drain toward the any buildup pressure before heat is ap- tank without sagging and are higher plied. than the fill pipe opening; (2) Diesel fuel shall not be allowed to (6) Shutoff valves located as close as enter pipelines, tanks, or containers practicable to the tank shell on each that have been welded, soldered, connection through which liquid can brazed, or cut until the metal has normally flow; and cooled to ambient temperature. (7) An automatic closing, heat-actuated valve on each withdrawal connec- § 75.1904 Underground diesel fuel tion below the liquid level. tanks and safety cans. (c) When tanks are provided with (a) Diesel fuel tanks used under- openings for manual gauging, liquid ground shall— tight, tethered or self-closing caps or (1) Have steel walls of a minimum 3⁄16- covers must be provided and must be inch thickness, or walls made of other kept closed when not open for gauging. metal of a thickness that provides (d) Surfaces of the tank and its asso- equivalent strength; ciated components must be protected (2) Be protected from corrosion; against damage by collision. (3) Be of seamless construction or (e) Before being placed in service, have liquid tight welded seams; tanks and their associated components (4) Not leak; and must be tested for leakage at a pres- (5) For stationary tanks in perma- sure equal to the working pressure, ex- nent underground diesel fuel storage cept tanks and components connected facilities, be placed on supports con- directly to piping systems, which must

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be properly designed for the applica- (2) Capable of withstanding four tion. times the static pressures; (f) Safety cans must be: (3) Compatible with diesel fuel; and (1) Limited to a nominal capacity of (4) Maintained in a manner that pre- 5 gallons or less; vents leakage. (2) Equipped with a flexible or rigid (c) Pipelines must have manual shut- tubular nozzle attached to a valved off valves installed at the surface fill- spout; ing point, and at the underground dis- (3) Provided with a vent valve de- charge point. signed to open and close simultaneously and automatically with the (d) If diesel fuel lines are not buried opening and closing of the pouring in the ground sufficiently to protect valve; and them from damage, shutoff valves must (4) Designed so that they will safely be located every 300 feet. relieve internal pressure when exposed (e) Shutoff valves must be installed to fire. at each branch line where the branch line joins the main line. § 75.1905 Dispensing of diesel fuel. (f) An automatic means must be pro- (a) Diesel-powered equipment in un- vided to prevent unintentional transfer derground coal mines may be refueled of diesel fuel from the surface into the only from safety cans, from tanks on permanent underground diesel fuel diesel fuel transportation units, or storage facility. from stationary tanks. (g) Diesel fuel piping systems from (b) Fuel that is dispensed from other the surface shall only be used to trans- than safety cans must be dispensed by port diesel fuel directly to stationary means of— tanks or diesel fuel transportation (1) Gravity feed with a hose equipped units in a permanent underground die- with a nozzle with a self-closing valve sel fuel storage facility. and no latch-open device; (h) The diesel fuel piping system (2) A manual pump with a hose equipped with a nozzle containing a must not be located in a borehole with self-closing valve; or electric power cables. (3) A powered pump with: (i) Diesel fuel piping systems located (i) An accessible emergency shutoff in entries must not be located on the switch for each nozzle; same side of the entry as electric ca- (ii) A hose equipped with a self-clos- bles or power lines. Where it is nec- ing valve and no latch-open device; and essary for piping systems to cross elec- (iii) An anti-siphoning device. tric cables or power lines, guarding (c) Diesel fuel must not be dispensed must be provided to prevent severed using compressed gas. electrical cables or power lines near (d) Diesel fuel must not be dispensed broken fuel lines. to the fuel tank of diesel-powered (j) Diesel fuel piping systems must be equipment while the equipment engine protected and located to prevent phys- is running. ical damage. (e) Powered pumps shall be shut off when fuel is not being dispensed. § 75.1906 Transport of diesel fuel. § 75.1905–1 Diesel fuel piping systems. (a) Diesel fuel shall be transported only by diesel fuel transportation units (a) Diesel fuel piping systems from the surface must be designed and oper- or in safety cans. ated as dry systems, unless an auto- (b) No more than one safety can shall matic shutdown is incorporated that be transported on a vehicle at any prevents accidental loss or spillage of time. The can must be protected from fuel and that activates an alarm sys- damage during transport. All other tem. safety cans must be stored in perma- (b) All piping, valves and fittings nent underground diesel fuel storage must be— facilities. (1) Capable of withstanding working (c) Safety cans that leak must be pressures and stresses; promptly removed from the mine.

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(d) Diesel fuel transportation unit (b) Diesel-powered equipment ap- tanks and safety cans must be con- proved under part 36 of this chapter spicuously marked as containing diesel must be provided with additional safe- fuel. ty features in accordance with the fol- (e) Diesel fuel transportation units lowing time schedule: must transport no more than 500 gal- (1) As of April 25, 1997 the equipment lons of diesel fuel at a time. must have a safety component system (f) Tanks on diesel fuel transpor- that limits surface temperatures to tation units must be permanently fixed those specified in subpart F of part 7 of to the unit and have a total capacity of this title; no greater than 500 gallons of diesel (2) As of November 25, 1999 the equip- fuel. ment must have an automatic or man- (g) Non-self-propelled diesel fuel ual fire suppression system that meets transportation units with electrical the requirements of § 75.1911 of this components for dispensing fuel that are part, and at least one portable multi- connected to a source of electrical purpose dry chemical type (ABC) fire power must be protected by a fire sup- extinguisher, listed or approved by a pression device that meets the require- nationally recognized independent ments of §§ 75.1107–3 through 75.1107–6, testing laboratory and having a and §§ 75.1107–8 through 75.1107–16. 10A:60B:C or higher rating. The fire ex- (h) Diesel fuel transportation units tinguisher must be located within easy and vehicles transporting safety cans reach of the equipment operator and be containing diesel fuel must have at protected from damage by collision. least two multipurpose, dry chemical (3) As of November 25, 1999 the equip- type (ABC) fire extinguishers, listed or ment must have a brake system that approved by a nationally recognized meets the requirements of § 75.1909 independent testing laboratory and (b)(6), (b)(7), (b)(8), (c), (d), and (e); having a 10A:60B:C or higher rating, (4) As of November 25, 1997 a particu- with one fire extinguisher provided on late index and dilution air quantity each side of the vehicle. shall be determined for the equipment (i) Diesel fuel transportation units in accordance with subpart E of part 7 shall be parked only in permanent un- of this chapter; and derground diesel fuel storage facilities (5) Permissible diesel-powered equip- or temporary underground diesel fuel ment manufactured on or after Novem- storage areas when not in use. ber 25, 1999 and that is used in an un- (j) When the distance between a die- derground coal mine shall incorporate sel fuel transportation unit and an en- a power package approved in accord- ergized trolley wire at any location is ance with part 7, subpart F of this less than 12 inches, the requirements of chapter. § 75.1003–2 must be followed. (c) As of November 25, 1999 nonpermissible diesel-powered equipment, (k) Diesel fuel shall not be trans- except the special category of equip- ported on or with mantrips or on con- ment under § 75.1908(d), shall meet the veyor belts. requirements of §§ 75.1909 and 75.1910 of (l) Diesel fuel shall be stored and this part. handled in accordance with the requirements of §§ 75.1902 through 75.1906 § 75.1908 Nonpermissible diesel-pow- of this part as of November 25, 1997. ered equipment; categories. [61 FR 55527, Oct. 25, 1996, as amended at 63 (a) Heavy-duty diesel-powered equip- FR 12647, Mar. 16, 1998] ment includes— (1) Equipment that cuts or moves § 75.1907 Diesel-powered equipment rock or coal; intended for use in underground (2) Equipment that performs drilling coal mines. or bolting functions; (a) As of November 25, 1996 all diesel- (3) Equipment that moves longwall powered equipment used where permis- components; sible electrical equipment is required (4) Self-propelled diesel fuel transpor- must be approved under part 36 of this tation units and self-propelled lube chapter. units; or

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(5) Machines used to transport port- (iii) A vent opening that maintains able diesel fuel transportation units or atmospheric pressure in the fuel tank, portable lube units. and that is designed to prevent fuel (b) Light-duty diesel-powered equip- from splashing out of the vent opening; ment is any diesel-powered equipment (iv) A self-closing filler cap on the that does not meet the criteria of para- fuel tank; graph (a). (v) The fuel tank, filler and vent (c) For the purposes of this subpart, must be located so that leaks or spill- the following equipment is considered age during refueling will not contact attended: hot surfaces; (1) Any machine or device operated (vi) Fuel line piping must be either by a miner; or steel-wire reinforced; synthetic elas- (2) Any machine or device that is tomer-covered hose suitable for use mounted in the direct line of sight of a with diesel fuel that has been tested job site located within 500 feet of such and has been determined to be fire-re- machine or device, which job site is oc- sistant by the manufacturer; or metal; cupied by a miner. (vii) Fuel line piping must be (d) Diesel-powered ambulances and clamped; fire fighting equipment are a special (viii) Primary fuel lines must be lo- category of equipment that may be cated so that fuel line leaks do not con- used underground only in accordance tact hot surfaces; with the mine fire fighting and evacu- (ix) The fuel lines must be separated ation plan under § 75.1502. from electrical wiring and protected [61 FR 55527, Oct. 25, 1996; 70 FR 36347, June from damage in ordinary use; 23, 2005] (x) A manual shutoff valve must be installed in the fuel system as close as § 75.1909 Nonpermissible diesel-pow- practicable to the tank; and ered equipment; design and per- (xi) A water separator and fuel fil- formance requirements. ter(s) must be provided. (a) Nonpermissible diesel-powered (4) A sensor to monitor the tempera- equipment, except for the special cat- ture and provide a visual warning of an egory of equipment under § 75.1908(d), overheated cylinder head on air-cooled must be equipped with the following engines; features: (5) Guarding to protect fuel, hydrau- (1) An engine approved under subpart lic, and electric lines when such lines E of part 7 of this title equipped with pass near rotating parts or in the event an air filter sized in accordance with of shaft failure; the engine manufacturer’s rec- (6) Hydraulic tanks, fillers, vents, ommendations, and an air filter service and lines located to prevent spillage or indicator set in accordance with the leaks from contacting hot surfaces; engine manufacturer’s recommenda- (7) Reflectors or warning lights tions; mounted on the equipment which can (2) At least one portable multipur- be readily seen in all directions; pose dry chemical type (ABC) fire ex- (8) A means to direct exhaust gas tinguisher listed or approved by a na- away from the equipment operator, tionally recognized independent test- persons on board the machine, and ing laboratory with a 10A:60B:C or combustible machine components; higher rating. The fire extinguisher (9) A means to prevent unintentional must be located within easy reach of free and uncontrolled descent of per- the equipment operator and protected sonnel-elevating work platforms; and from damage; (10) A means to prevent the spray (3) A fuel system specifically de- from ruptured hydraulic or lubricating signed for diesel fuel meeting the fol- oil lines from being ignited by contact lowing requirements: with engine exhaust system component (i) A fuel tank and fuel lines that do surfaces. not leak; (b) Self-propelled nonpermissible die- (ii) A fuel tank that is substantially sel-powered equipment must have the constructed and protected against following features in addition to those damage by collision; in paragraph (a):

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(1) A means to ensure that no stored (5) Has a means in the equipment op- hydraulic energy that will cause ma- erator’s compartment to apply the chine articulation is available after the brakes manually without shutting engine is shut down; down the engine, and a means to re- (2) A neutral start feature which en- lease and reengage the brakes without sures that engine cranking torque will the engine operating; and not be transmitted through the (6) Has a means to ensure that the powertrain and cause machine move- supplemental braking system is re- ment on vehicles utilizing fluid power leased before the equipment can be transmissions; trammed, and is designed to ensure the (3) For machines with steering brake is fully released at all times wheels, brake pedals, and accelerator while the equipment is trammed. pedals, controls which are of auto- (d) Self-propelled nonpermissible mobile orientation; light-duty diesel-powered equipment (4) An audible warning device conven- under § 75.1908(b), except rail-mounted iently located near the equipment op- equipment, must be provided with a erator; parking brake that holds the fully (5) Lights provided and maintained loaded equipment stationary on the on both ends of the equipment. Equip- maximum grade on which it is operated ment normally operated in both direc- despite any contraction of the brake tions must be equipped with headlights parts, exhaustion of any nonmechan- for both directions; ical source of energy, or leakage. (6) Service brakes that act on each (e) The supplemental and park brake wheel of the vehicle and that are de- systems required by paragraphs (c) and signed such that failure of any single (d) must be applied when the equip- component, except the brake actuation ment operator is not at the controls of pedal or other similar actuation device, must not result in a complete loss the equipment, except during move- of service braking capability; ment of disabled equipment. (7) Service brakes that safely bring (f) Self-propelled personnel-elevating the fully loaded vehicle to a complete work platforms must be provided with stop on the maximum grade on which a means to ensure that the parking it is operated; and braking system is released before the (8) No device that traps a column of equipment can be trammed, and must fluid to hold the brake in the applied be designed to ensure the brake is fully position shall be installed in any brake released at all times while the equip- system, unless the trapped column of ment is trammed. fluid is released when the equipment (g) Any nonpermissible equipment operator is no longer in contact with that discharges its exhaust directly the brake activation device. into a return air course must be pro- (c) Self-propelled nonpermissible vided with a power package approved heavy-duty diesel-powered equipment under subpart F of part 7 of this title. under § 75.1908(a), except rail-mounted (h) Self-propelled nonpermissible equipment, shall be provided with a heavy-duty diesel-powered equipment supplemental braking system that: meeting the requirements of § 75.1908(a) (1) Engages automatically within 5 must be provided with an automatic seconds of the shutdown of the engine; fire suppression system meeting the re- (2) Safely brings the equipment when quirements of § 75.1911. fully loaded to a complete stop on the (i) Self-propelled nonpermissible maximum grade on which it is oper- light-duty diesel-powered equipment ated; meeting the requirements of § 75.1908(b) (3) Holds the equipment stationary, must be provided with an automatic or despite any contraction of brake parts, manual fire suppression system meet- exhaustion of any nonmechanical ing the requirements of § 75.1911. source of energy, or leakage; (j) Nonpermissible equipment that is (4) Releases only by a manual control not self-propelled must have the fol- that does not operate any other equip- lowing features in addition to those ment function; listed in paragraph (a):

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(1) A means to prevent inadvertent multaneously and perform virtually movement of the equipment when the same duty; parked; (f) Each ungrounded conductor must (2) Safety chains or other suitable have insulation compatible with the secondary connections on equipment impressed voltage. Insulation mate- that is being towed; and rials must be resistant to deterioration (3) An automatic fire suppression sys- from engine heat and oil. Electric con- tem meeting the requirements of ductors must meet the applicable re- § 75.1911. quirements of §§ 75.513 and 75.513–1, except electric conductors for starting [61 FR 55527, Oct. 25, 1996; 62 FR 34641, June 27, 1997] motors, which must only meet the requirements of § 75.513; § 75.1910 Nonpermissible diesel-pow- (g) All wiring must have adequate ered equipment; electrical system mechanical protection to prevent dam- design and performance require- age to the cable that might result in ments. short circuits; Electrical circuits and components (h) Sharp edges and corners must be associated with or connected to elec- removed at all points where there is a trical systems on nonpermissible die- possibility of damaging wires, cables, sel-powered equipment utilizing stor- or conduits by cutting or abrasion. The age batteries and integral charging insulation of the cables within a bat- systems, except for the special cat- tery box must be protected against ab- egory of equipment under § 75.1908(d), rasion; must conform to the following require- (i) When insulated wires other than ments: cables pass through metal frames, the (a) Overload and short circuit protec- holes must be substantially bushed tion must be provided for electric cir- with insulated bushings. Cables must cuits and components in accordance enter metal frames of motors, splice with §§ 75.518 and 75.518–1 of this part; boxes, and electric components only (b) Each electric conductor from the through proper fittings. All electrical battery to the starting motor must be connections and splices must be me- protected against short circuit by fuses chanically and electrically efficient, or other circuit-interrupting devices and suitable connectors shall be used. placed as near as practicable to the All electrical connectors or splices in battery terminals; insulated wire must be reinsulated at (c) Each branch circuit conductor least to the same degree of protection connected to the main circuit between as the remainder of the wire; the battery and charging generator (j) The battery must be secured to must be protected against short circuit prevent movement, and must be pro- by fuses or other automatic circuit-in- tected from external damage by posi- terrupting devices; tion. Batteries that are not protected (d) The electrical system shall be from external damage by position must equipped with a circuit-interrupting be enclosed in a battery box. Flame-re- device by means of which all power sistant insulation treated to resist conductors can be deenergized. The de- chemical reaction to electrolyte must vice must be located as close as prac- be provided on battery connections to ticable to the battery terminals and be prevent battery terminals from con- designed to operate within its elec- tacting conducting surfaces; trical rating without damage. The de- (k) A battery box, including the vice shall not automatically reset after cover, must be constructed of steel being actuated. All magnetic circuit- with a minimum thickness of 1⁄8 inch, interrupting devices must be mounted or of a material other than steel that in a manner to preclude their closing provides equivalent strength; by force of gravity; (l) Battery-box covers must be lined (e) Each motor and charging gener- with a flame-resistant insulating mate- ator must be protected by an auto- rial permanently attached to the un- matic overcurrent device. One protec- derside of the cover, unless equivalent tive device will be acceptable when two protection is provided. Battery-box motors of the same rating operate si- covers must be provided with a means

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for securing them in closed position. At and battery areas on diesel-powered least 1⁄2 inch of air space must be pro- equipment and electric panels or con- vided between the underside of the trols used on fuel transportation units cover and the top of the battery, in- and other areas as necessary. cluding terminals; (c) If automatic, the fire suppression (m) Battery boxes must be provided system shall include audible and visual with ventilation openings to prevent alarms to warn of fires or system the accumulation of flammable or faults. toxic gases or vapors within the bat- (d) The fire suppression system shall tery box. The size and locations of provide for automatic engine shut- openings for ventilation must prevent down. If the fire suppression system is direct access to battery terminals; automatic, engine shutdown and dis- (n) The battery must be insulated charge of suppressant agent may be de- from the battery-box walls and sup- layed for a maximum of 15 seconds ported on insulating materials. Insu- after the fire is detected by the system. lating materials that may be subject to (e) The fire suppression system shall chemical reaction with electrolyte be operable by at least two manual ac- must be treated to resist such action; tuators. One actuator shall be located and on each side of the equipment. If the (o) Drainage holes must be provided equipment is provided with an opera- in the bottom of each battery box. tor’s compartment, one of the manual actuators shall be located in the com- § 75.1911 Fire suppression systems for partment within reach of the operator. diesel-powered equipment and fuel (f) The fire suppression system shall transportation units. remain operative in the event of engine (a) The fire suppression system re- shutdown, equipment electrical system quired by §§ 75.1907 and 75.1909 shall be a failure, or failure of any other equip- multipurpose dry chemical type (ABC) ment system. fire suppression system listed or ap- (g) The electrical components of each proved by a nationally recognized inde- fire suppression system installed on pendent testing laboratory and appro- equipment used where permissible elec- priate for installation on diesel-pow- tric equipment is required shall be per- ered equipment and fuel transportation missible or intrinsically safe and such units. components shall be maintained in per- (1) The system shall be installed in missible or intrinsically safe condition. accordance with the manufacturer’s (h) Electrically operated detection specifications and the limitations of and actuation circuits shall be mon- the listing or approval. itored and provided with status indica- (2) The system shall be installed in a tors showing power and circuit con- protected location or guarded to mini- tinuity. If the system is not elec- mize physical damage from routine ve- trically operated, a means shall be pro- hicle operations. vided to indicate the functional readi- (3) Suppressant agent distribution ness status of the detection system. tubing or piping shall be secured and (i) Each fire suppression system shall protected against damage, including be tested and maintained in accordance pinching, crimping, stretching, abra- with the manufacturer’s recommended sion, and corrosion. inspection and maintenance program (4) Discharge nozzles shall be posi- and as required by the nationally rec- tioned and aimed for maximum fire ognized independent testing laboratory suppression effectiveness. Nozzles shall listing or approval, and be visually in- also be protected against the entrance spected at least once each week by a of foreign materials such as mud, coal person trained to make such inspec- dust, or rock dust. tions. (b) The fire suppression system shall (j) Recordkeeping. Persons performing provide fire suppression and, if auto- inspections and tests of fire suppres- matic, fire detection for the engine in- sion systems under paragraph (i) shall cluding the starter, transmission, hy- record when a fire suppression system draulic pumps and tanks, fuel tanks, does not meet the installation or main- exposed brake units, air compressors tenance requirements of this section.

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(1) The record shall include the pinching, crimping, stretching, abra- equipment on which the fire suppression, and corrosion. sion system did not meet the installa- (5) Discharge nozzles shall be position or maintenance requirements of tioned and aimed for maximum fire this section, the defect found, and the suppression effectiveness in the pro- corrective action taken. tected areas. Nozzles must also be pro- (2) Records are to be kept manually tected against the entrance of foreign in a secure manner not susceptible to materials such as mud, coal dust, and alteration or recorded electronically in rock dust. a secured computer system that is not (b) The fire suppression system shall susceptible to alteration. provide automatic fire detection and (3) Records shall be maintained at a automatic fire suppression for all areas surface location at the mine for one within the facility. year and made available for inspection (c) Audible and visual alarms to warn by an authorized representative of the of fire or system faults shall be pro- Secretary and miners’ representatives. vided at the protected area and at a (k) All miners normally assigned to surface location which is continually the active workings of the mine shall monitored by a person when personnel be instructed about the hazards inher- are underground. In the event of a fire, ent to the operation of the fire suppres- personnel shall be warned in accord- sion systems and, where appropriate, ance with the provisions set forth in the safeguards available for each sys- § 75.1502. tem. (d) The fire suppression system shall (l) For purposes of § 75.380(f), a fire deenergize all power to the diesel fuel suppression system installed on diesel- storage facility when actuated except powered equipment and meeting the re- that required for automatic enclosure quirements of this section is equivalent and alarms. to a fire suppression system meeting (e) Fire suppression systems shall in- the requirements of §§ 75.1107–3 through clude two manual actuators located as 75.1107–16. follows: § 75.1912 Fire suppression systems for (1) At least one within the fuel stor- permanent underground diesel fuel age facility; and storage facilities. (2) At least one a safe distance away (a) The fire suppression system re- from the storage facility and located in quired by § 75.1903 shall be an auto- intake air, upwind of the storage facil- matic multipurpose dry chemical type ity. (ABC) fire suppression system listed or (f) The fire suppression system shall approved as an engineered dry chem- remain operational in the event of ical extinguishing system by a nation- electrical system failure. ally recognized independent testing (g) Electrically operated detection laboratory and appropriate for installa- and actuation circuits shall be mon- tion at a permanent underground diesel itored and provided with status indica- fuel storage facility. tors showing power and circuit con- (1) Alternate types of fire suppression tinuity. If the system is not elec- systems shall be approved in accord- trically operated, a means shall be pro- ance with § 75.1107–13 of this part. vided to indicate the functional readi- (2) The system shall be installed in ness status of the detection system. accordance with the manufacturer’s (h) Each fire suppression system specifications and the limitations of shall be tested and maintained in ac- the listing or approval. cordance with the manufacturer’s rec- (3) The system shall be installed in a ommended inspection and maintenance protected location or guarded to pre- program and as required by the nation- vent physical damage from routine op- ally recognized independent testing erations. laboratory listing or approval, and be (4) Suppressant agent distribution visually inspected at least once each tubing or piping shall be secured and week by a person trained to make such protected against damage, including inspections.

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(i) Recordkeeping. Persons performing (d) Compressed oxygen or compressed inspections and tests of fire suppres- flammable gases shall not be connected sion systems under paragraph (h) shall to diesel air-start systems. record when a fire suppression system does not meet the installation or main- § 75.1914 Maintenance of diesel-pow- tenance requirements of this section. ered equipment. (1) The record shall include the facil- (a) Diesel-powered equipment shall ity whose fire suppression system did be maintained in approved and safe not meet the installation or mainte- condition or removed from service. nance requirements of this section, the (b) Maintenance and repairs of ap- defect found, and the corrective action proved features and those features re- taken. quired by §§ 75.1909 and 75.1910 on diesel- (2) Records are to be kept manually powered equipment shall be made only in a secure manner not susceptible to by a person qualified under § 75.1915. alteration or recorded electronically in (c) The water scrubber system on die- a secured computer system that is not sel-powered equipment shall be drained susceptible to alteration. and flushed, by a person who is trained (3) Records shall be maintained at a to perform this task, at least once on surface location at the mine for one each shift in which the equipment is year and made available for inspection operated. by an authorized representative of the (d) The intake air filter on diesel- Secretary and miners’ representatives. powered equipment shall be replaced or (j) All miners normally assigned to serviced, by a person who is trained to the active workings of the mine shall perform this task, when the intake air be instructed about the hazards inher- pressure drop device so indicates or ent to the operation of the fire suppres- when the engine manufacturer’s max- sion systems and, where appropriate, imum allowable air pressure drop level the safeguards available for each sys- is exceeded. tem. (e) Mobile diesel-powered equipment that is to be used during a shift shall [61 FR 55527, Oct. 25, 1996; 70 FR 36347, June be visually examined by the equipment 23, 2005] operator before being placed in operation. Equipment defects affecting § 75.1913 Starting aids. safety shall be reported promptly to (a) Volatile fuel starting aids shall be the mine operator. used in accordance with recommenda- (f) All diesel-powered equipment tions provided by the starting aid man- shall be examined and tested weekly by ufacturer, the engine manufacturer, a person qualified under § 75.1915. and the machine manufacturer. (1) Examinations and tests shall be (b) Containers of volatile fuel start- conducted in accordance with approved ing aids shall be conspicuously marked checklists and manufacturers’ mainte- to indicate the contents. When not in nance manuals. use, containers of volatile fuel starting (2) Persons performing weekly exami- aids shall be stored in metal enclosures nations and tests of diesel-powered that are used only for storage of start- equipment under this paragraph shall ing aids. Such metal enclosures must make a record when the equipment is be conspicuously marked, secured, and not in approved or safe condition. The protected from damage. record shall include the equipment (c) Volatile fuel starting aids shall that is not in approved or safe condi- not be: tion, the defect found, and the correc- (1) Taken into or used in areas where tive action taken. permissible equipment is required; (g) Undiluted exhaust emissions of (2) Used in the presence of open diesel engines in diesel-powered equip- flames or burning flame safety lamps, ment approved under part 36 and or when welding or cutting is taking heavy-duty nonpermissible diesel-pow- place; or ered equipment as defined in § 75.1908(a) (3) Used in any area where 1.0 percent in use in underground coal mines shall or greater concentration of methane is be tested and evaluated weekly by a present. person who is trained to perform this

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task. The mine operator shall develop signed tasks with respect to diesel- and implement written standard oper- powered equipment maintenance, re- ating procedures for such testing and pairs, examinations and tests; evaluation that specify the following: (3) Address, at a minimum, the fol- (1) The method of achieving a repeat- lowing: able loaded engine operating condition (i) The requirements of subpart T of for each type of equipment; this part; (2) Sampling and analytical methods (ii) Use of appropriate power package (including calibration of instrumenta- or machine checklists to conduct tests tion) that are capable of accurately de- to ensure that diesel-powered equip- tecting carbon monoxide in the ex- ment is in approved and safe condition, pected concentrations; with acceptable emission levels; (3) The method of evaluation and in- (iii) Proper maintenance of approved terpretation of the results; features and the correct use of the ap- (4) The concentration or changes in propriate maintenance manuals, in- concentration of carbon monoxide that will indicate a change in engine per- cluding machine adjustments, service, formance. Carbon monoxide concentra- and assembly; tion shall not exceed 2500 parts per mil- (iv) Diesel-powered equipment fire lion; and suppression system tests and mainte- (5) The maintenance of records nec- nance; essary to track engine performance. (v) Fire and ignition sources and (h) Recordkeeping. Records required their control or elimination, including by paragraphs (f)(2) and (g)(5) shall be— cleaning of the equipment; (1) Recorded in a secure book that is (vi) Safe fueling procedures and not susceptible to alteration, or re- maintenance of the fuel system of the corded electronically in a computer equipment; and system that is secure and not suscep- (vii) Intake air system maintenance tible to alteration; and and tests. (2) Retained at a surface location at (4) Include an examination that re- the mine for at least 1 year and made quires demonstration of the ability to available for inspection by an author- perform all assigned tasks with respect ized representative of the Secretary to diesel-powered equipment mainte- and by miners’ representatives. nance, repairs, examinations and tests; (i) Diesel-powered equipment must be and maintained in accordance with this (5) Be in writing. The written pro- part as of November 25, 1997. gram shall include a description of the course content, materials, and teach- § 75.1915 Training and qualification of persons working on diesel-powered ing methods for initial training and re- equipment. training. (a) To be qualified to perform main- (c) Recordkeeping. The operator shall tenance, repairs, examinations and maintain a copy of the training and tests on diesel-powered equipment, as qualification program required by this required by § 75.1914, a person must suc- section and a record of the names of all cessfully complete a training and qual- persons qualified under the program. ification program that meets the re- (1) The record of the names of quali- quirements of this section. A person fied persons shall be made in a manner qualified to perform these tasks shall that is not susceptible to alteration, or be retrained as necessary to maintain recorded electronically in a computer the ability to perform all assigned die- system that is secure and not suscep- sel-powered equipment maintenance, tible to alteration. repairs, examinations and tests. (2) The training and qualification (b) A training and qualification pro- program and record of qualified persons gram under this section must: are to be kept at surface location of (1) Be presented by a competent in- the mine and made available for in- structor; spection by an authorized representa- (2) Be sufficient to prepare or update tive of the Secretary and by miners’ a person’s ability to perform all as- representatives.

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§ 75.1916 Operation of diesel-powered 77.203 Use of material or equipment over- equipment. head; safeguards. 77.204 Openings in surface installations; (a) Diesel-powered equipment shall safeguards. be operated at a speed that is con- 77.205 Travelways at surface installations. sistent with the type of equipment 77.206 Ladders; construction; installation being operated, roadway conditions, and maintenance. grades, clearances, visibility, and other 77.207 Illumination. traffic. 77.208 Storage of materials. 77.209 Surge and storage piles. (b) Operators of mobile diesel-pow- 77.210 Hoisting of materials. ered equipment shall maintain full 77.211 Draw-off tunnels; stockpiling and re- control of the equipment while it is in claiming operations; general. motion. 77.211–1 Continuous methane monitoring de- (c) Standardized traffic rules, includ- vice; installation and operation; auto- ing speed limits, signals and warning matic deenergization of electric equip- signs, shall be established at each mine ment. 77.212 Draw-off tunnel ventilation fans; in- and followed. stallation. (d) Except as required in normal min- 77.213 Draw-off tunnel escapeways. ing operations, mobile diesel-powered 77.214 Refuse piles; general. equipment shall not be idled. 77.215 Refuse piles, construction require- (e) Diesel-powered equipment shall ments. not be operated unattended. 77.215–1 Refuse piles; identification. 77.215–2 Refuse piles; reporting requirements. PART 77—MANDATORY SAFETY 77.215–3 Refuse piles; certification. STANDARDS, SURFACE COAL 77.215–4 Refuse piles; abandonment. MINES AND SURFACE WORK 77.216 Water, sediment, or slurry impound- ments and impounding structures; gen- AREAS OF UNDERGROUND COAL eral. MINES 77.216–1 Water, sediment or slurry impound- ments and impounding structures; iden- Subpart A—General tification. 77.216–2 Water, sediment, or slurry im- Sec. poundments and impounding structures; 77.1 Scope. minimum plan requirements; changes or 77.2 Definitions. modifications; certification. 77.216–3 Water, sediment, or slurry im- Subpart B—Qualified and Certified Persons poundments and impounding structures; inspection requirements; correction of 77.100 Certified person. hazards; program requirements. 77.101 Tests for methane and for oxygen de- 77.216–4 Water, sediment or slurry impound- ficiency; qualified person. ments and impounding structures; re- 77.102 Tests for methane; oxygen deficiency; porting requirements; certification. qualified person, additional requirement. 77.216–5 Water, sediment or slurry impound- 77.103 Electrical work; qualified person. ments and impounding structures; aban- 77.104 Repair of energized surface high volt- donment. age lines; qualified person. 77.217 Definitions. 77.105 Qualified hoistman; slope or shaft sinking operation; qualifications. Subpart D—Thermal Dryers 77.106 Records of certified and qualified persons. 77.300 Thermal dryers; general. 77.107 Training programs. 77.301 Dryer heating units; operation. 77.107–1 Plans for training programs. 77.302 Bypass stacks. 77.303 Hot gas inlet chamber dropout doors. Subpart C—Surface Installations 77.304 Explosion release vents. 77.305 Access to drying chambers, hot gas 77.200 Surface installations; general. inlet chambers and ductwork; installa- 77.201 Methane content in surface installation and maintenance. tions. 77.306 Fire protection. 77.201–1 Tests for methane; qualified person; 77.307 Thermal dryers; location and instal- use of approved device. lation; general. 77.201–2 Methane accumulations; change in 77.308 Structures housing other facilities; ventilation. use of partitions. 77.202 Dust accumulations in surface instal- 77.309 Visual check of system equipment. lations. 77.309–1 Control stations; location.

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