Cover image for National electrical code : 1999.
Title:
National electrical code : 1999.
Author:
National Fire Protection Association.
Edition:
1999 edition.
Publication Information:
Quincy, Mass. : National Fire Protection Association, [1998]

©1998
Physical Description:
644 pages : illustrations ; 27 cm.
General Note:
"Approved as an American National Standard on August 6, 1998."

"This edition of NFPA 70, National Electrical Code, was ... issued by the Standards Council on July 16, 1998, with an effective date of August 5, 1998, and supersedes all previous editions."

Includes index.
Language:
English
ISBN:
9780877654322
Format :
Book

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Summary

Summary

Revised every three years, the National Electric Code is the most widely used and accepted criteria for all electrical installations. It is adopted as law by most states, cities, and municipalities. It contains the up-to-the minute facts and safety guidelines students and electricians need to avoid costly errors. It remains a must-have reference for anyone involved in electrical design installation, identification, and/or inspection.


Table of Contents

90 Introductionp. 17
Chapter 1 General
100 Definitionsp. 19
A. Generalp. 19
B. Over 600 Volts, Nominalp. 25
110 Requirements for Electrical Installationsp. 26
A. Generalp. 26
B. 600 Volts, Nominal, or Lessp. 28
C. Over 600 Volts, Nominalp. 30
D. Tunnel Installations Over 600 Volts, Nominalp. 32
Chapter 2 Wiring and Protection
200 Use and Identification of Grounded Conductorsp. 35
210 Branch Circuitsp. 37
A. General Provisionsp. 37
B. Branch-Circuit Ratingsp. 41
C. Required Outletsp. 43
215 Feedersp. 46
220 Branch-Circuit, Feeder, and Service Calculationsp. 48
A. Generalp. 48
B. Feeders and Servicesp. 48
C. Optional Calculations for Computing Feeder and Service Loadsp. 52
D. Method for Computing Farm Loadsp. 55
225 Outside Branch Circuits and Feedersp. 55
A. Generalp. 56
B. More than One Building or Other Structurep. 58
C. Over 600 Voltsp. 60
230 Servicesp. 61
A. Generalp. 61
B. Overhead Service-Drop Conductorsp. 62
C. Underground Service-Lateral Conductorsp. 63
D. Service-Entrance Conductorsp. 64
E. Service Equipment -- Generalp. 66
F. Service Equipment -- Disconnecting Meansp. 66
G. Service Equipment -- Overcurrent Protectionp. 68
H. Services Exceeding 600 Volts, Nominalp. 69
240 Overcurrent Protectionp. 70
A. Generalp. 70
B. Locationp. 73
C. Enclosuresp. 76
D. Disconnecting and Guardingp. 76
E. Plug Fuses, Fuseholders, and Adaptersp. 77
F. Cartridge Fuses and Fuseholdersp. 77
G. Circuit Breakersp. 78
H. Supervised Industrial Installationsp. 78
I. Overcurrent Protection Over 600 Volts, Nominalp. 80
250 Groundingp. 80
A. Generalp. 80
B. Circuit and System Groundingp. 83
C. Grounding Electrode System and Grounding electrode Conductorp. 88
D. Enclosure, Raceway, and Service Cable Groundingp. 91
E. Bondingp. 92
F. Equipment Grounding and Equipment Grounding Conductorsp. 94
G. Methods of Equipment Groundingp. 98
H. Direct-Current Systemsp. 100
J. Instruments, Meters, and Relaysp. 101
K. Grounding of Systems and Circuits of 1 kV and Over (High Voltage)p. 102
280 Surge Arrestersp. 103
A. Generalp. 103
B. Installationp. 104
C. Connecting Surge Arrestersp. 104
Chapter 3 Wiring Methods and Materials
300 Wiring Methodsp. 105
A. General Requirementsp. 105
B. Requirements for Over 600 Volts, Nominalp. 113
305 Temporary Wiringp. 115
310 Conductors for General Wiringp. 116
318 Cable Traysp. 140
320 Open Wiring on Insulatorsp. 146
321 Messenger Supported Wiringp. 147
324 Concealed Knob-and-Tube Wiringp. 148
325 Integrated Gas Spacer Cablep. 149
A. Generalp. 149
B. Installationp. 150
C. Construction Specificationsp. 150
326 Medium Voltage Cablep. 150
328 Flat Conductor Cablep. 151
A. Generalp. 151
B. Installationp. 151
C. Constructionp. 152
330 Mineral-Insulated, Metal-Sheathed Cablep. 153
A. Generalp. 153
B. Installationp. 153
C. Construction Specificationsp. 154
331 Electrical Nonmetallic Tubingp. 154
A. Generalp. 154
B. Installationp. 155
C. Construction Specificationsp. 155
333 Armored Cablep. 155
A. Generalp. 155
B. Installationp. 156
C. Construction Specificationsp. 157
334 Metal-Clad Cablep. 157
A. Generalp. 157
B. Installationp. 157
C. Construction Specificationsp. 158
336 Nonmetallic-Sheathed Cablep. 159
A. Generalp. 159
B. Installationp. 159
C. Construction Specificationsp. 160
338 Service-Entrance Cablep. 161
339 Underground Feeder and Branch-Circuit Cablep. 162
340 Power and Control Tray Cablep. 162
342 Nonmetallic Extensionsp. 163
343 Nonmetallic Underground Conduit with Connectorsp. 164
A. Generalp. 164
B. Installationp. 165
C. Constructionp. 165
345 Intermediate Metal Conduitp. 166
A. Generalp. 166
B. Installationp. 166
C. Construction Specificationsp. 167
346 Rigid Metal Conduitp. 167
A. Generalp. 167
B. Installationp. 168
C. Construction Specificationsp. 169
347 Rigid Nonmetallic Conduitp. 169
A. Installationsp. 170
B. Construction Specificationsp. 172
348 Electrical Metallic Tubingp. 172
A. Generalp. 172
B. Installationp. 173
C. Construction Specificationsp. 174
349 Flexible Metallic Tubingp. 174
A. Generalp. 174
B. Construction and Installationp. 174
350 Flexible Metal Conduitp. 175
A. Generalp. 175
B. Installationp. 175
351 Liquidtight Flexible Metal Conduit and Liquidtight Flexible Nonmentallic Conduitp. 176
A. Liquidtight Flexible Metal Conduitp. 176
B. Liquidtight Flexible Nonmetallic Conduitp. 177
352 Surface Metal Raceways and Surface Nonmetallic Racewaysp. 178
A. Surface Metal Racewaysp. 178
B. Surface Nometallic Racewaysp. 179
C. Strut-Type Channel Racewayp. 180
353 Multioutlet Assemblyp. 181
354 Underfloor Racewaysp. 181
356 Cellular Metal Floor Racewaysp. 183
A. Installationp. 183
B. Construction Specificationsp. 183
358 Cellular Concrete Floor Racewaysp. 184
362 Metal Wireways and Nonmetallic Wirewaysp. 184
A. Metal Wirewaysp. 184
B. Nonmetallic Wirewaysp. 186
363 Flat Cable Assembliesp. 187
364 Buswaysp. 188
A. General Requirementsp. 188
B. Requirements for Over 600 Volts, Nominalp. 189
365 Cablebusp. 190
370 Outlet, Device, Pull and Junction Boxes, Conduit Bodies and Fittingsp. 191
A. Scope and Generalp. 191
B. Installationp. 192
C. Construction Specificationsp. 197
D. Manholes and Other Electric Enclosures Intended for Personnel Entryp. 197
E. Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominalp. 199
373 Cabinets, Cutout Boxes, and Meter Socket Enclosuresp. 199
A. Installationp. 199
B. Construction Specificationsp. 201
374 Auxiliary Guttersp. 202
380 Switchesp. 204
A. Installationp. 204
B. Construction Specificationsp. 207
384 Switchboards and Panelboardsp. 207
A. Generalp. 207
B. Switchboardsp. 208
C. Panelboardsp. 208
D. Construction Specificationsp. 210
Chapter 4 Equipment for General Use
400 Flexible Cords and Cablesp. 211
A. Generalp. 211
B. Construction Specificationsp. 220
C. Portable Cables Over 600 Volts, Nominalp. 221
402 Fixture Wiresp. 221
410 Lighting Fixtures, Lampholders, Lamps, and Receptaclesp. 225
A. Generalp. 225
B. Fixture Locationsp. 225
C. Provisions at Fixture Outlet Boxes, Canopies, and Pansp. 226
D. Fixture Supportsp. 227
E. Groundingp. 227
F. Wiring of Fixturesp. 228
G. Construction of Fixturesp. 229
H. Installation of Lampholdersp. 230
J. Construction of Lampholdersp. 230
K. Lamps and Auxiliary Equipmentp. 231
L. Receptacles, Cord Connectors, and Attachment Plugs (Caps)p. 231
M. Special Provisions for Flush and Recessed Fixturesp. 232
N. Construction of Flush and Recessed Fixturesp. 233
P. Special Provisions for Electric-Discharge Lighting Systems of 1000 Volts or Lessp. 233
Q. Special Provisions for Electric-Discharge Lighting Systems of More Than 100 Voltsp. 234
R. Lighting Trackp. 235
411 Lighting Systems Operating at 30 Volts or Lessp. 236
422 Appliancesp. 236
A. Generalp. 236
B. Installationp. 236
C. Disconnecting Meansp. 239
D. Constructionp. 240
E. Markingp. 241
424 Fixed Electric Space-Heating Equipmentp. 241
A. Generalp. 241
B. Installationp. 242
C. Control and Protection of Fixed Electric Space-Heating Equipmentp. 242
D. Marking of Heating Equipmentp. 244
E. Electric Space-Heating Cablesp. 244
F. Duct Heatersp. 246
G. Resistance-Type Boilersp. 246
H. Electrode-Type Boilersp. 247
J. Electric Radiant Heating Panels and Heating Panel Setsp. 248
426 Fixed Outdoor Electric Deicing and Snow-Melting Equipmentp. 250
A. Generalp. 250
B. Installationp. 251
C. Resistance Heating Elementsp. 251
D. Impedance Heatingp. 252
E. Skin-Effect Heatingp. 252
F. Control and Protectionp. 253
427 Fixed Electric Heating Equipment for Pipelines and Vesselsp. 253
A. Generalp. 253
B. Installationp. 254
C. Resistance Rating Elementsp. 254
D. Induction Heatingp. 255
F. Skin-Effect Heatingp. 255
G. Control and Protectionp. 256
430 Motors, Motor Circuits, and Controllersp. 256
A. Generalp. 256
B. Motor Circuit Conductorsp. 262
C. Motor and Branch-Circuit Overload Protectionp. 264
D. Motor Branch-Circuit Short-Circuit and Ground-Fault Protectionp. 267
E. Motor Feeder Short-Circuit and Ground-Fault Protectionp. 270
F. Motor Control Circuitsp. 270
G. Motor Controllersp. 272
H. Motor Control Centersp. 273
J. Disconnecting Meansp. 275
K. Over 600 Volts, Nominalp. 278
L. Protection of Live Parts -- All Voltagesp. 278
M. Grounding -- All Voltagesp. 279
N. Tablesp. 280
440 Air-Conditioning and Refrigeration Equipmentp. 283
A. Generalp. 283
B. Disconnecting Meansp. 285
C. Branch-Circuit Short-Circuit and Ground-Fault Protectionp. 286
D. Branch-Circuit Conductorsp. 287
E. Controllers for Motor-Compressorsp. 287
F. Motor-Compressor and Branch-Circuit Overload Protectionp. 288
G. Provisions for Room Air Conditionersp. 289
445 Generatorsp. 289
450 Transformers and Transformer Vaults (Including Secondary Ties)p. 290
A. General Provisionsp. 291
B. Specific Provisions Applicable to Different Types of Transformersp. 295
C. Transformer Vaultsp. 296
455 Phase Convertersp. 297
A. Generalp. 297
B. Specific Provisions Applicable to Different Types of Transformersp. 299
460 Capacitorsp. 299
A. 600 Volts, Nominal, and Underp. 299
B. Over 600 Volts, Nominalp. 300
470 Resistors and Reactorsp. 301
A. 600 Volts, Nominal, and Underp. 301
B. Over 600 Volts, Nominalp. 301
480 Storage Batteriesp. 301
490 Equipment, Over 600 Volts, Nominalp. 303
A. Generalp. 303
B. Equipment -- Specific Provisionsp. 303
C. Equipment -- Metal-Enclosed Power Switchgear and Industrial Control Assembliesp. 305
D. Mobile and Portable Equipmentp. 307
E. Electrode-Type Boilersp. 308
Chapter 5 Special Occupancies
500 Hazardous (Classified) Locations, Classes I, II, and III, Divisions 1 and 2p. 309
501 Class I Locationsp. 315
502 Class II Locationsp. 324
503 Class III Locationsp. 330
504 Intrinsically Safe Systemsp. 333
505 Class I, Zone 0, 1, and 2 Locationsp. 335
510 Hazardous (Classified) Locations -- Specificp. 342
511 Commercial Garages, Repair and Storagep. 343
513 Aircraft Hangarsp. 344
514 Gasoline Dispensing and Service Stationsp. 346
515 Bulk Storage Plantsp. 350
516 Spray Application, Dipping, and Coating Processesp. 353
517 Health Care Facilitiesp. 359
A. Generalp. 359
B. Wiring and Protectionp. 361
C. Essential Electrical Systemp. 364
D. Inhaiation Anesthetizing Locationsp. 372
E. X-Ray Installationsp. 375
F. Communications, Signaling Systems, Data Systems, Fire Alarm Systems, and Systems Less than 120 Volts, Nominalp. 376
G. Isolated Power Systemsp. 377
518 Places of Assemblyp. 378
520 Theaters, Audience Areas of Motion Picture and Television Studios, and Similar Locationsp. 379
A. Generalp. 379
B. Fixed Stage Switchboardsp. 380
C. Fixed Stage Equipment Other than Switchboardsp. 381
D. Portable Switchboards on Stagep. 383
E. Portable Stage Equipment Other than Switchboardsp. 386
F. Dressing Roomsp. 387
G. Groundingp. 387
525 Carnivals, Circuses, Fairs, and Similar Eventsp. 387
A. General Requirementsp. 387
B. Installationp. 388
C. Grounding and Bondingp. 389
D. Disconnecting Meansp. 389
E. Attractions Utilizing Pools, Fountains, and Similar Installations with Contained Volumes of Waterp. 389
530 Motion Picture and Television Studios and Similar Locationsp. 389
A. Generalp. 389
B. Stage or Setp. 390
C. Dressing Roomsp. 393
D. Viewing, Cutting, and Patching Tablesp. 393
E. Cellulose Nitrate Film Storage Vaultsp. 393
F. Substationsp. 393
G. Separately Derived Systems with 60 Volts to Groundp. 393
540 Motion Picture Projectorsp. 394
A. Generalp. 394
B. Definitionsp. 394
C. Equipment and Projectors of the Professional Typep. 394
D. Nonprofessional Projectorsp. 395
E. Audio Signal Processing, Amplification, and Reproduction Equipmentp. 395
545 Manufactured Buildingp. 395
A. Generalp. 395
547 Agricultural Buildingsp. 396
550 Mobile Homes, Manufactured Homes, and Mobile Home Parksp. 398
A. Generalp. 398
B. Mobile Homesp. 399
C. Services and Feedersp. 406
551 Recreational Vehicles and Recreational Vehicle Parksp. 407
A. Generalp. 407
B. Low-Voltage Systemsp. 408
C. Combination Electrical Systemsp. 410
D. Other Power Sourcesp. 410
E. Norminal 120-Volt or 120/240-Volt Systemsp. 411
F. Factory Testsp. 418
G. Recreational Vehicle Parksp. 418
552 Park Trailersp. 420
A. Generalp. 420
B. Low-Voltage Systemsp. 421
C. Combination Electrical Systemsp. 422
D. Nominal 120-Volt or 120/240-Volt Systemsp. 423
E. Factory Testsp. 429
553 Floating Buildingsp. 430
A. Generalp. 430
B. Services and Feedersp. 430
C. Groundingp. 430
555 Marinas and Boatyardsp. 431
Chapter 6 Special Equipment
600 Electric Signs and Outline Lightingp. 433
A. Generalp. 433
B. Field-Installed Skeleton Tubingp. 435
604 Manufactured Wiring Systemsp. 437
605 Office Furnishings (Consisting of Lighting Accessories and Wired Partitions)p. 437
610 Cranes and Hoistsp. 438
A. Generalp. 438
B. Wiringp. 439
C. Contact Conductorsp. 441
D. Disconnecting Meansp. 442
E. Overcurrent Protectionp. 442
F. Controlp. 443
G. Groundingp. 443
620 Elevators, Dumbwaiters, Escalators, Moving Walks, Wheelchair Lifts, and Stairway Chair Liftsp. 444
A. Generalp. 444
B. Conductorsp. 445
C. Wiringp. 446
D. Installation of Conductorsp. 448
E. Traveling Cablesp. 449
F. Disconnecting Means and Controlp. 450
G. Overcurrent Protectionp. 451
H. Machine Roomp. 451
J. Groundingp. 452
K. Emergency and Standby Power Systemsp. 452
625 Electric Vehicle Charging System Equipmentp. 452
A. Generalp. 452
B. Wiring Methodsp. 453
C. Equipment Constructionp. 453
D. Control and Protectionp. 454
E. Electric Vehicle Supply Equipment Locationsp. 454
630 Electric Weldersp. 455
A. Generalp. 455
B. Are Weldersp. 455
C. Resistance Weldersp. 456
D. Welding Cablep. 457
640 Audio Signal Processing Araplification, and Reproduction Equipmentp. 458
A. Generalp. 458
B. Permanent Audio System Installationsp. 461
C. Portable and Temporary Audio System Installationsp. 462
645 Information Technology Equipmentp. 463
650 Pipe Organsp. 464
660 X-Ray Equipmentp. 465
A. Generalp. 465
B. Controlp. 466
C. Transformers and Capacitorsp. 467
D. Guarding and Groundingp. 467
665 Induction and Dielectric Heating Equipmentp. 467
A. Generalp. 467
B. Guarding, Grounding, and Labelingp. 467
C. Motor-Generator Equipmentp. 468
D. Equipment Other than Motor-Generatorsp. 469
668 Electrolytic Cellsp. 469
669 Electroplatingp. 472
670 Industrial Machineryp. 473
675 Electrically Driven or Controlled Irrigation Machinesp. 474
A. Generalp. 474
B. Center Pivot Irrigation Machinesp. 476
680 Swimming Pools, Fountains, and Similar Installationsp. 476
A. Generalp. 476
B. Permanently Installed Poolsp. 480
C. Storable Poolsp. 484
D. Spas and Hot Tubsp. 485
E. Fountainsp. 486
F. Pools and Tubs for Therapeutic Usep. 487
G. Hydromassage Bathtubsp. 488
685 Integrated Electrical Systemsp. 489
A. Generalp. 489
B. Orderly Shutdownp. 489
690 Solar Photovoltaic Systemsp. 489
A. Generalp. 489
B. Circuit Requirementsp. 492
C. Disconnecting Meansp. 493
D. Wiring Methodsp. 494
E. Groundingp. 495
F. Markingp. 495
G. Connection to Other Sourcesp. 496
H. Storage Batteriesp. 496
I. Systems Over 600 Voltsp. 497
695 Fire Pumpsp. 497
Chapter 7 Special Conditions
700 Emergency Systemsp. 501
A. Generalp. 501
B. Circuit Wiringp. 502
C. Sources of Powerp. 503
D. Emergency System Circuits for Lighting and Powerp. 504
E. Control -- Emergency Lighting Circuitsp. 504
F. Overcurrent Protectionp. 505
701 Legally Required Standby Systemsp. 505
A. Generalp. 505
B. Circuit Wiringp. 506
C. Sources of Powerp. 506
D. Overcurrent Protectionp. 507
702 Optional Standby Systemsp. 507
A. Generalp. 507
B. Circuit Wiringp. 508
705 Interconnected Electrical Power Production Sourcesp. 508
720 Circuits and Equipment Operating at Less than 50 Voltsp. 510
725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuitsp. 510
A. Generalp. 510
B. Class 1 Circuitsp. 511
C. Class 2 and Class 3 Circuitsp. 513
727 Instrumentation Tray Cable: Type ITCp. 518
760 Fire Alarm Systemsp. 519
A. Generalp. 519
B. Nonpower-Limited Fire Alarm (NPLFA) Circuitsp. 520
C. Power-Limited Fire Alarm (PLFA) Circuitsp. 523
770 Optical Fiber Cables and Racewaysp. 527
A. Generalp. 527
B. Protectionp. 528
C. Cables Within Buildingsp. 528
780 Closed-Loop and Programmed Power Distributionp. 531
Chapter 8 Communications Systems
800 Communications Circuitsp. 533
A. Generalp. 533
B. Conductors Outside and Entering Buildingsp. 533
C. Protectionp. 535
D. Grounding Methodsp. 536
E. Communications Wires and Cables Within Buildingsp. 537
810 Radio and Television Equipmentp. 541
A. Generalp. 541
B. Receiving Equipment -- Antenna Systemsp. 542
C. Amateur Transmitting and Receiving Stations -- Antenna Systemsp. 544
D. Interior Installation -- Transmitting Stationsp. 544
820 Community Antenna Television and Radio Distribution Systemsp. 545
A. Generalp. 545
B. Cables Outside and Entering Buildingsp. 545
C. Protectionp. 546
D. Grounding Methodsp. 547
E. Cables Within Buildingsp. 548
830 Network-Powered Broadband Communications Systemsp. 550
A. Generalp. 550
B. Cables Outside and Entering Buildingsp. 552
C. Protectionp. 554
D. Grounding Methodsp. 556
E. Network-Powered Broadband Communications Systems Wiring Methods Within Buildingsp. 557
Chapter 9 Tables
Table 1 Percent of Cross Section of Conduit and Tubing for Conductorsp. 561
Table 4 Dimensions and Percent Area of Conduit and Tubingp. 562
Table 5 Dimensions of Insulated Conductors and Fixture Wiresp. 564
Table 5A Compact Aluminum Building Wire Nominal Dimensions and Areasp. 566
Table 8 Conductor Propertiesp. 567
Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75[ch]C (167[ch]F) -- Three Single Conductors in Conduitp. 568
Table 11(a) Class 2 and Class 3 Alternating-Current Power Source Limitationsp. 569
Table 11(b) Class 2 and Class 3 Direct-Current Power Source Limitationsp. 569
Table 12(a) PLFA Alternating-Current Power Source Limitationsp. 570
Table 12(b) PLFA Direct-Current Power Source Limitationsp. 570
Appendix Ap. 571
Appendix Bp. 575
Appendix Cp. 585
Appendix Dp. 609
Appendix Ep. 617
Indexp. 619