Contents
Foreword xv
Introduction xvii
Article Chapter 1 General 1
100 Definitions 1
110 Requirements for Electrical Installations 1
General 3
600 Volts, Nominal or Less 12
Over 600 Volts, Nominal 16
Tunnel Installations Over 600 Volts, Nominal 21
Chapter 2 Wiring and Protection 25
200 Use and Identification of Grounded Conductors 25
210 Branch Circuits 30
General Provisions 30
Branch-Circuit Ratings 43
Required Outlets 48
215 Feeders 55
220 Branch-Circuit, Feeder, and Service Calculations 60
General 60
Feeders 63
Optional Calculations for Computing Feeder
and Service Loads 71
Method for Computing Farm Loads 75
225 Outside Branch Circuits and Feeders 75
More Than One Building or Structure 84
Over 600 Volts 88
230 Services 88
General 88
Overhead Services 92
Underground Service—Lateral Conductors 97
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Service-Entrance Conductors 98
Service Equipment—General 107
Service Equipment—Disconnecting Means 107
Service Equipment—Overcurrent Protection 115
Service Exceeding 600 Volts, Nominal 120
240 Overcurrent Protection 123
General 123
Location 127
Enclosures 134
Disconnecting and Guarding 135
Plug Fuses, Fuseholders, and Adapters 136
Cartridge Fuses and Fuseholders 138
Circuit Breakers 139
Supervised Industrial Installations 140
Overcurrent Protection Over 600
Volts, Nominal 142
250 Grounding 143
General 143
Circuit and System Grounding 147
Grounding Electrode System and
Grounding Electrode Conductor 162
Grounding Conductors 166
Enclosure and Raceway Grounding 174
Bonding 175
Equipment Grounding and
Equipment-Grounding Conductors 183
Methods of Equipment Grounding 190
Direct Current Systems 197
Instruments, Meters, and Relays 198
Grounding of Systems and Circuits
of 1 kV and Over (High Voltage) 200
280 Surge Arresters 202
General 202
Installation 203
Connecting Surge Arresters 204
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Chapter 3 Wiring Methods and Materials 207
300 Wiring Methods 207
General Requirements 207
Requirements for Over 600 Volts, Nominal 225
310 Conductors for General Wiring 227
312 Cabinets and Cutout Boxes 237
Installation 237
Construction Specifications 243
314 Outlet, Device, Pull, and Junction Boxes,
Conduit Bodies, Fittings, and Handhole
Enclosures 244
General 244
Installation 245
Construction Specifications 261
Manholes and Other Electric
Enclosures Intended for Personnel Entry 262
Pull and Junction Boxes for Use on
Systems Over 600 Volts, Nominal 263
320 Armored Cable: Type AC 265
General 265
Installation 265
Construction 267
322 Flat Cable Assemblies: Type FC 268
Installation 269
Construction 270
324 Flat Conductor Cable: Type FCC 270
General 270
Installation 272
Construction 274
326 Integrated Gas Spacer Cable: Type IGS 274
328 Medium Voltage Cable: Type MV 274
330 Metal-Clad Cable: Type MC 275
General 275
Installation 275
Construction Specifications 278
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332 Mineral-Insulated, Metal-Sheathed Cable:
Type MI 278
General 278
Installation 280
Construction Specifications 282
334 Nonmetallic-Sheathed Cable: Types NM
and NMC 283
General 283
Installation 284
Construction Specifications 287
336 Power and Control Tray Cable: Type TC 287
Installation 287
Construction Specifications 288
338 Service-Entrance Cable: Types SE and USE 289
340 Underground Feeder and Branch-Circuit
Cable: Type UF 292
Installation 293
342 Intermediate Metal Conduit 294
General 294
Installation 294
Construction Specifications 297
344 Rigid Metal Conduit 297
Installation 298
Construction Specifications 302
348 Flexible Metal Conduit 303
Installation 303
Installation 305
352 Rigid Nonmetallic Conduit 308
Installation 308
354 Nonmetallic Underground Conduit
with Conductors 311
General 311
Installation 311
Construction 313
356 Liquid-Tight Flexible Nonmetallic Conduit 313
General 313
Installation 313
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358 Electrical Metallic Tubing 315
Installation 315
360 Flexible Metallic Tubing 317
Installation 317
362 Electrical Nonmetallic Tubing 319
General 319
Installation 319
366 Auxiliary Gutters 322
368 Busways 326
General Requirements 326
Requirements for over 600 Volts, Nominal 330
370 Cablebus 331
372 Cellular Concrete Floor Raceways 333
374 Cellular Metal Floor Raceways 334
Installation 335
376 Metal Wireways 336
378 Nonmetallic Wireways 339
380 Multioutlet Assembly 341
Installation 341
382 Nonmetallic Extensions 343
Installation 343
386 Surface Metal Raceways 348
Installation 348
388 Surface Nonmetallic Raceways 350
Installation 350
Construction Specifications 351
390 Underfloor Raceways 351
392 Cable Trays 357
394 Concealed Knob-and-Tube Wiring 372
396 Messenger-Supported Wiring 375
398 Open Wiring on Insulators 377
Chapter 4 Equipment for General Use 381
400 Flexible Cords and Cables 381
General 381
Construction Specifications 385
Portable Cables Over 600 Volts, Nominal 386
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402 Fixture Wires 387
404 Switches 388
Installation 388
Construction Specifications 396
408 Switchboards and Panelboards 397
Switchboards 399
Panelboards 400
Construction Specifications 404
409 Industrial Control Panels 405
410 Lighting Fixtures, Lampholders, Lamps,
Receptacles, and Rosettes 406
General 406
Fixture Locations 407
Provisions at Fixture Outlet Boxes,
Canopies, and Pans 411
Fixture Supports 412
Grounding 414
Wiring of Fixtures 415
Construction of Fixtures 420
Installation of Lampholders 420
Construction of Lampholders 420
Lamps and Auxiliary Equipment 420
Receptacles, Cord Connectors, and
Attachment Plugs (Caps) 421
Special Provisions for Flush and
Recessed Fixtures 424
Construction of Flush and Recessed Fixtures 426
Special Provisions for Electric-Discharge Lighting
Systems of 1000 Volts or Less 426
Special Provisions for Electric-Discharge Lighting
Systems of More Than 1000 Volts 429
Lighting Track 432
411 Lighting Systems Operating
at 30 Volts or Less 433
422 Appliances 434
General 434
Branch-Circuit Requirements 435
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Installation of Appliances 435
Control and Protection of Appliances 440
424 Fixed Electrical Space-Heating Equipment 444
General 444
Installation 445
Control and Protection of Fixed Electric
Space-Heating Equipment 446
Marking of Heating Equipment 450
Electric Space-Heating Cables 450
Duct Heaters 456
Resistance-Type Boilers 458
Electrode-Type Boilers 460
Electric Radiant Heating Panels and
Heating Panel Sets 462
426 Fixed Outdoor Electric De-icing and
Snow-Melting Equipment 466
General 466
Installation 467
Resistance Heating Elements 468
Impedance Heating 471
Skin-Effect Heating 472
Control and Protection 472
427 Fixed Electric Heating Equipment for
Pipelines and Vessels 473
General 473
Installation 475
Resistance Heating Elements 476
Impedance Heating 477
Induction Heating 478
Skin-Effect Heating 479
Control and Protection 479
430 Motors, Motor Circuits, and Controllers 480
General 480
Motor Circuit Conductors 489
Motor and Branch-Circuit Overload Protection 494
Motor Branch-Circuit, Short-Circuit, and
Ground-Fault Protection 501
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Motor Feeder Short-Circuit and
Ground-Fault Protection 506
Motor Control Circuits 507
Motor Controllers 511
Motor Control Centers 515
Disconnecting Means 516
Over 600 Volts, Nominal 522
Protection of Live Parts—All Voltages 524
Grounding All Voltages 525
440 Air-Conditioning and Refrigerating
Equipment 527
General 527
Disconnecting Means 531
Branch-Circuit, Short-Circuit,
and Ground-Fault Protection 534
Branch-Circuit Conductors 536
Controllers for Motor-Compressors 537
Motor-Compressor and Branch-Circuit
Overload Protection 538
Provisions for Room Air Conditioners 540
445 Generators 542
450 Transformers and Transformer
Vaults (Including Secondary Ties) 544
General Provisions 545
Specific Provision Applicable to Different
Types of Transformers 558
Transformer Vaults 561
460 Capacitors 564
600 Volts, Nominal, and Under 564
470 Resistors and Reactors 569
480 Storage Batteries 569
490 Equipment Over 600 Volts, Nominal 570
General 570
Equipment—Specific Provisions 572
Equipment—Metal-Enclosed Power Switchgear
and Industrial Control Assemblies 577
Mobile and Portable Equipment 577
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Chapter 5 Special Occupancies 579
500 (Classified) Locations 579
501 Class I Locations 588
502 Class II Locations 608
503 Class III Locations 623
504 Intrinsically Safe Systems 630
505 Class I, Zone 0, 1, and 2 Locations 632
510 Hazardous (Classified) Locations—Specific 632
511 Commercial Garages, Repair, and Storage 633
513 Aircraft Hangars 640
514 Gasoline-Dispensing and Service Stations 645
515 Bulk Storage Plants 650
516 Spray Application, Dipping, and Coating
Processes 654
517 Health Care Facilities 659
General 659
Wiring Design and Protection 664
Essential Electrical System 668
Inhalation Anesthetizing Locations 679
X-Ray Equipment 682
Communications, Signaling Systems,
Data Systems, Fire Protective Signaling
Systems, and Systems Less Than 120 Volts,
Nominal 685
Isolated Power Systems 686
518 Places of Assembly 688
520 Theaters and Similar Locations 689
General 689
Fixed Stage Switchboard 691
Stage Equipment—Fixed 693
Portable Switchboards on Stage 695
Stage Equipment—Portable 696
Dressing Rooms 696
Grounding 696
525 Carnivals, Circuses, Fairs, and Similar Events 696
General Requirements 696
Power Sources 697
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Wiring Methods 697
Grounding and Bonding 699
527 Temporary Wiring 699
530 Motion Picture and Television Studios
and Similar Locations 702
540 Motion-Picture Projectors 702
545 Manufactured Building 702
General 702
547 Agricultural Buildings 705
550 Mobile Homes and Mobile Home Parks 710
General 710
Mobile Homes 715
Services and Feeders 716
551 Recreational Vehicles and Recreational
Vehicle Parks 718
553 Floating Buildings 719
555 Marinas and Boatyards 719
Chapter 6 Special Equipment 721
600 Electric Signs and Outline Lighting 721
604 Manufactured Wiring Systems 721
605 Office Furnishings (Consisting of Lighting
Accessories and Wired Partitions) 722
610 Cranes and Hoists 725
620 Elevators, Dumbwaiters, Escalators,
and Moving Walks 725
630 Electric Welders 725
640 Sound-Recording and Similar Equipment 725
645 Information Technology Equipment 725
650 Organs 728
660 X-Ray Equipment 728
665 Induction and Dielectric Heating Equipment 728
668 Electrolytic Cells 729
669 Electroplating 729
670 Industrial Machinery 729
675 Electrically Driven and Controlled Irrigation
Machines 729
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