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Interpreting the Requirements of Articles 500-516 of the NEC®

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Interpreting the Requirements of Articles 500-516 of the NEC® Interpreting the Requirements of Articles 500-516 of the NEC® 2017 National Electrical Code® Review A Guide for the Use of Appleton™ Products in Hazardous Locations TABLE OF CONTENTS Introduction 1 General Information 3 NEC® ARTICLES 100, 500 THROUGH 516 – TEXT AND COMMENTARY Article 100 – Definitions 11 Article 500 – Hazardous (Classified) Locations, Class I, II, and III, Divisions 1 and 2 Changes to Article 500 19 500.1 Scope — Articles 500 Through 504 19 500.3 Other Articles 19 500.4 General 19 500.5 Classifications of Locations 19 500.6 Material Groups 22 500.7 Protection Techniques 24 500.8 Equipment 26 500.9 Specific Occupancies 30 Article 501 – Class I Locations Changes to Article 501 31 501.1 Scope 31 501.5 Zone Equipment 31 501.10 Wiring Methods 31 501.15 Sealing and Drainage 35 501.17 Process Sealing 43 501.20 Conductor Insulation, Class I, Divisions 1 and 2 44 501.25 Uninsulated Exposed Parts, Class I, Divisions 1 and 2 44 501.30 Grounding and Bonding, Class I, Divisions 1 and 2 44 501.35 Surge Protection 45 501.100 Transformers and Capacitors 45 501.105 Meters, Instruments, and Relays 45 501.115 Switches, Circuit Breakers, Motor Controllers, and Fuses 47 501.120 Control Transformers and Resistors 47 501.125 Motors and Generators 48 501.130 Luminaires 50 501.135 Utilization Equipment 53 501.140 Flexible Cords, Class I, Divisions 1 and 2 54 501.145 Receptacles and Attachment Plugs, Class I, Divisions 1 and 2 55 501.150 Signaling, Alarm, Remote-Control, and Communications Systems 56 Article 502 – Class II Locations Changes to Article 502 57 502.1 Scope 57 502.5 Explosionproof Equipment 57 502.6 Zone Equipment 57 502.10 Wiring Methods 57 502.15 Sealing, Class II, Divisions 1 and 2 60 502.25 Uninsulated Exposed Parts, Class II, Divisions 1 and 2 60 502.30 Grounding and Bonding, Class II, Divisions 1 and 2 61 502.35 Surge Protection — Class II, Divisions 1 and 2 61 i 2017 CODE REVIEW TABLE OF CONTENTS 502.100 Transformers and Capacitors 61 502.115 Switches, Circuit Breakers, Motor Controllers, and Fuses 62 502.120 Control Transformers and Resistors 62 502.125 Motors and Generators 63 502.128 Ventilating Piping 64 502.130 Luminaires 64 502.135 Utilization Equipment 65 502.140 Flexible Cords — Class II, Divisions 1 and 2 66 502.145 Receptacles and Attachment Plugs 67 502.150 Signaling, Alarm, Remote-Control, and Communications Systems; and Meters, Instruments, and Relays 67 Article 503 – Class III Locations Changes to Article 503 69 503.1 Scope 69 503.5 General 69 503.6 Zone Equipment 70 503.10 Wiring Methods 70 503.25 Uninsulated Exposed Parts, Class III, Divisions 1 and 2 71 503.30 Grounding and Bonding — Class III, Divisions 1 and 2 71 503.100 Transformers and Capacitors — Class III, Divisions 1 and 2 72 503.115 Switches, Circuit Breakers, Motor Controllers, and Fuses — Class III, Divisions 1 and 2 72 503.120 Control Transformers and Resistors — Class III, Divisions 1 and 2 72 503.125 Motors and Generators — Class III, Divisions 1 and 2 72 503.128 Ventilating Piping — Class III, Divisions 1 and 2 72 503.130 Luminaires — Class III, Divisions 1 and 2 72 503.135 Utilization Equipment — Class III, Divisions 1 and 2 73 503.140 Flexible Cords — Class III, Divisions 1 and 2 73 503.145 Receptacles and Attachment Plugs — Class III, Divisions 1 and 2 73 503.150 Signaling, Alarm, Remote-Control, and Local Loudspeaker Intercommunications Systems — Class III, Divisions 1 and 2 74 503.155 Electric Cranes, Hoists, and Similar Equipment — Class III, Divisions 1 and 2 74 503.160 Storage Battery Charging Equipment — Class III, Divisions 1 and 2 74 Article 504 – Intrinsically Safe Systems Changes to Article 504 75 504.1 Scope 75 504.2 Definitions 75 504.3 Application of Other Articles 75 504.4 Equipment 75 504.10 Equipment Installation 75 504.20 Wiring Methods 76 504.30 Separation of Intrinsically Safe Conductors 76 504.50 Grounding 77 504.60 Bonding 78 504.70 Sealing 78 504.80 Identification 78 Article 505 – Zone 0, 1, and 2 Locations Changes to Article 505 79 505.1 Scope 79 ii 2017 CODE REVIEW TABLE OF CONTENTS 505.2 Definitions 79 505.3 Other Articles 80 505.4 General 80 505.5 Classifications of Locations 81 505.6 Material Groups 82 505.7 Special Precaution 83 505.8 Protection Techniques 83 505.9 Equipment 84 505.15 Wiring Methods 88 505.16 Sealing and Drainage 90 505.17 Flexible Cords and Connections 94 505.18 Conductors and Conductor Insulation 95 505.19 Uninsulated Exposed Parts 95 505.20 Equipment Requirements 95 505.22 Increased Safety “e” Motors and Generators 95 505.25 Grounding and Bonding 96 505.26 Process Sealing 96 Article 506 – Zone 20, 21, and 22 Locations for Combustible Dusts or Ignitable Fibers/Flyings Changes to Article 506 99 506.1 Scope 99 506.2 Definitions 99 506.3 Other Articles 100 506.4 General 100 506.5 Classification of Locations 100 506.6 Material Groups 101 506.7 Special Precaution 101 506.8 Protection Techniques 102 506.9 Equipment Requirements 103 506.15 Wiring Methods 104 506.16 Sealing 106 506.17 Flexible Cords 106 506.20 Equipment Installation 106 506.25 Grounding and Bonding 107 Article 510 – Hazardous (Classified) Locations – Specific Changes to Article 510 109 510.1 Scope 109 510.2 General 109 Article 511 – Commercial Garages, Repair and Storage Changes to Article 511 111 511.1 Scope 111 511.2 Definitions 111 511.3 Area Classification, General 111 511.4 Wiring and Equipment in Class I Locations 112 511.7 Wiring and Equipment Installed Above Class I Locations 113 511.8 Underground Wiring 114 iii 2017 CODE REVIEW TABLE OF CONTENTS 511.9 Sealing 114 511.10 Special Equipment 114 511.12 Ground-Fault Circuit-Interrupter Protection for Personnel 115 511.16 Grounding and Bonding Requirements 115 Article 513 – Aircraft Hangers Changes to Article 513 117 513.1 Scope 117 513.2 Definitions 117 513.3 Classification of Locations 117 513.4 Wiring and Equipment in Class I Locations 117 513.7 Wiring and Equipment Not Installed in Class I Locations 117 513.8 Underground Wiring 118 513.9 Sealing 118 513.10 Special Equipment 118 513.12 Ground-Fault Circuit-Interrupter Protection for Personnel 119 513.16 Grounding and Bonding Requirements 119 Article 514 – Motor Fuel Dispensing Facilities Changes to Article 514 121 514.1 Scope 121 514.2 Definition 121 514.3 Classification of Locations 121 514.4 Wiring and Equipment Installed in Class I Locations 126 514.7 Wiring and Equipment Above Class I Locations 126 514.8 Underground Wiring 126 514.9 Sealing 127 514.11 Circuit Disconnects 127 514.13 Provisions for Maintenance and Service of Dispensing Equipment 127 514.16 Grounding and Bonding 127 Article 515 – Bulk Storage Plants Changes to Article 515 129 515.1 Scope 129 515.3 Class I Locations 129 515.4 Wiring and Equipment Located in Class I Locations 129 515.7 Wiring and Equipment Above Class I Locations 129 515.8 Underground Wiring 132 515.9 Sealing 132 515.10 Special Equipment — Gasoline Dispensers 132 515.16 Grounding and Bonding 132 Article 516 – Spray Application, Dipping, Coating, and Printing Processes Using Flammable or Combustible Materials Changes to Article 516 135 516.1 Scope 135 516.2 Definitions 135 516.4 Area Classification for Open Containers 136 516.5 Area Classification for Spray Application Processes 137 516.6 Wiring and Equipment in Class I Locations 140 516.7 Wiring and Equipment Not Within Classified Locations 141 iv 2017 CODE REVIEW TABLE OF CONTENTS 516.10 Special Equipment 141 516.16 Grounding 143 516.18 Area Classification for Temporary Membrane Enclosures 143 516.23 Electrical and Other Sources of Ignition 144 516.29 Classification of Locations 144 516.35 Areas Adjacent to Enclosed Dipping and Coating Processes 146 516.36 Equipment and Containers in Ventilated Areas 146 516.37 Luminaires 146 516.38 Wiring and Equipment Not Within Classified Locations 146 516.40 Static Electric Discharges 147 APPENDIXES Appendix A-1: Class I Flammable Gases And Vapors 149 Appendix A-2: Class II Combustible Dusts 155 Appendix B-1: Applicable Product Standards 159 Appendix B-2: NEMA Enclosure Definitions 161 Appendix B-3: Comparison Between NEMA Enclosure Type Numbers and IEC® Enclosure Classification Designations 162 Appendix C: Standards, Testing and Certification 164 Appendix D: Quick Selection Guide — Equipment for Hazardous Locations 166 Appendix E-1: Lighting and Power Diagrams: Class I, Divisions 1 and 2, Group B; Class I, Zones 1 and 2, Groups IIA, IIB + H2 170 Appendix E-2: Power Diagram: Class I, Division 1, Groups C and D, Class I, Zone 1, Groups IIA, IIB 172 Appendix E-3: Lighting Diagram: Class I, Division 1, Groups C and D; Class 1, Zone 1, Groups IIA and IIB 174 Appendix E-4: Lighting and Power Diagram: Class I, Division 2, Groups C and D; Class I, Zone 2, Groups IIA and IIB 176 Appendix E-5: Power Diagram: Class II, Divisions 1 and 2, Groups E, F and G; Class II, Zones 21 and 22 178 Appendix E-6: Lighting Diagram: Class II, Divisions 1 and 2, Groups E, F and G; Class II, Zones 21 and 22 180 Appendix E-7: Lighting and Power Diagram: Class I, Zone 1; Class I, Zone 2 182 v 2017 CODE REVIEW NOTES vi 2017 CODE REVIEW INTRODUCTION PURPOSE OF THE REVIEW Material taken from the National Electrical Code is reprinted with permission from NFPA 70®-2017, National Electrical Code®, • Assist in interpreting the requirements of Articles 500-516 Copyright © 2016, National Fire Protection Association, Quincy, of the 2017 NEC®.
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