Cover image for Interpreting the National Electrical Code
Title:
Interpreting the National Electrical Code
Author:
Surbrook, Truman C.
Personal Author:
Edition:
Second edition.
Publication Information:
Albany, NY : Delmar Publishers, 1990.
Physical Description:
xvi, 400 pages : illustrations ; 28 cm
General Note:
"Based on the 1990 National Electrical Code."

Includes indexes.
Language:
English
ISBN:
9780827333802
Format :
Book

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Summary

Summary

This guide explains the articles of the National Electrical Code and offers practical examples to illustrate how the code is applied. Discussion is organized by subject, integrating material on how the code is interpreted in specific field situations with information that is not directly addressed in the code, such as work in metric units, voltage drop, transformer K-ratings, and photovoltaic systems. The guide is useful as a how-to book and a professional reference for apprentices, electricians, and electrical inspectors. This sixth edition contains beginning and advanced multiple-choice problem sets. The authors are affiliated with Michigan State University. c. Book News Inc.


Table of Contents

List of Tablesp. xv
Prefacep. xvii
Unit 1 General Wiring and Fundamentalsp. 1
Origin of the National Electrical Codep. 1
Electrical Calculations with A Calculatorp. 2
Fundamentals of Electricityp. 3
AC and DCp. 3
Metric Conversionsp. 4
Wire Dimensionsp. 5
Wire Resistancep. 6
Ohm's Lawp. 9
Circuitsp. 10
Power and Work Formulasp. 12
Efficiencyp. 14
Student Practice Problemsp. 14
Code Discussionp. 15
Art. 80 Administration and enforcementp. 15
Art. 90 Introductionp. 16
Art. 100 Definitionsp. 16
Art. 110 Requirements for electrical installationsp. 17
Art. 200 Use and identification of grounded conductorsp. 18
Art. 300 Wiring methodsp. 18
Art. 310 Conductors for general wiringp. 19
Art. 320 Armored Cablep. 21
Art. 324 Flat Conductor Cablep. 21
Art. 328 Medium-Voltage Cablep. 21
Art. 330 Metal-Clad Cablep. 22
Art. 332 Mineral-Insulated, Metal Sheathed Cablep. 23
Art. 334 Nonmetallic-Sheathed Cablep. 23
Art. 336 Power and Control Tray Cablep. 24
Art. 338 Service-Entrance Cablep. 24
Art. 340 Underground Feeder and Branch-Circuit Cablep. 24
Art. 382 Nonmetallic Extensionsp. 24
Art. 394 Concealed Knob-and-Tube Wiringp. 24
Art. 527 Temporary Installationsp. 24
Ch. 9 Tables 8 and 9p. 25
Sizing Conductors for a Circuitp. 25
Using the Code to Answer Questionsp. 28
Student Code Practicep. 30
Major Changes to the 2002 Codep. 32
Art. 90, 100, 110p. 32
Art. 300p. 35
Art. 310 and 320p. 36
Art. 330 and 332p. 37
Art. 334 and 338p. 38
Art. 340p. 39
Art. 527p. 39
Ch. 9 - Table 8p. 40
Worksheet No. 1--Beginningp. 41
Worksheet No. 1--Advancedp. 46
Unit 2 Wire, Raceway, and Box Sizingp. 51
Code Discussionp. 51
Art. 312 Cabinets, cutout boxes, and metal socket enclosuresp. 51
Art. 314 Outlet, device, pull and junction boxes, and conduit bodiesp. 51
Art. 342 Intermediate Metal Conduit (IMC)p. 52
Art. 344 Rigid Metal Conduit (RMC)p. 53
Art. 348 Flexible Metal Conduit (FMC)p. 53
Art. 350 Liquidtight Flexible Metal Conduit (LFMC)p. 54
Art. 352 Rigid Nonmetallic Conduit (RNC)p. 54
Art. 354 Nonmetallic Underground Conduit with Conductors (UNCC)p. 57
Art. 356 Liquidtight Flexible Nonmetallic Conduit (LFNC)p. 54
Art. 358 Electrical Metallic Tubing (EMT)p. 57
Art. 360 Flexible Metallic Tubing (FMT)p. 57
Art. 362 Electrical Nonmetallic Tubing (ENT)p. 57
Art. 366 Auxiliary guttersp. 58
Art. 376 Metal wirewaysp. 58
Art. 378 Nonmetallic wirewaysp. 58
Art. 386 Surface metal racewaysp. 58
Art. 388 Surface nonmetallic racewaysp. 58
Ch. 9 Notes to tablesp. 59
Ch. 9 Tables 1, 4, 5, and 5Ap. 59
Annex C: Tablesp. 59
Sample Calculationsp. 60
Protecting Conductorsp. 61
Neutral as a Current-Carrying Conductorp. 62
Sizing Conductorsp. 64
Sizing Conduit and Tubingp. 68
Sizing Conduit and Tubing Nipplesp. 69
Wireway Sizingp. 70
Sizing Boxesp. 70
Pull Boxesp. 73
Conduit Bodiesp. 75
Sizing and Installing Parallel Conductor Setsp. 76
Major Changes to the 2002 Codep. 78
Art. 314p. 78
Art. 342, 344, 350, 352 and 356p. 80
Art. 358, 362, 376 and 378p. 81
Ch. 9 and Annex Cp. 82
Worksheet No. 2--Beginningp. 83
Worksheet No. 2--Advancedp. 88
Unit 3 Outlets, Lighting, Applicances, and Heatingp. 95
Code Discussionp. 95
Art. 210 Branch-circuitsp. 95
Art. 220 Part I Branch-circuit calculationsp. 99
Art. 225 Outside branch-circuits and feedersp. 100
Art. 396 Messenger-supported wiringp. 101
Art. 398 Open wiring on insulatorsp. 101
Art. 400 Flexible cords and cablesp. 101
Art. 402 Fixture wiresp. 102
Art. 404 Switchesp. 102
Art. 406 Receptacles, cord connectors and attachment plugsp. 102
Art. 410 Lighting fixtures, lampholders, and lampsp. 103
Art. 411 Lighting systems operating at 30 volts or lessp. 103
Art. 422 Appliancesp. 103
Art. 424 Fixed electric space heating equipmentp. 103
Art. 426 Fixed outdoor electric de-icing and snow-melting equipmentp. 104
Art. 720 Circuits and equipment operating at less than 50 voltsp. 104
Art. 725 Class 1, 2, and 3 remote-control, signaling and power-limited circuitsp. 104
Sample Calculationsp. 104
Circuit and Outlet Requirementsp. 104
Electric Range for a Dwellingp. 106
Major Changes to the 2002 Codep. 109
Art. 210p. 109
Art. 220, Part Ip. 100
Art. 225p. 112
Art. 404 and 406p. 114
Art. 410p. 115
Art. 422 and 424p. 116
Art. 725p. 117
Worksheet No. 3--Beginningp. 119
Worksheet No. 3--Advancedp. 124
Unit 4 Services and Feeder Calculationsp. 129
Code Discussionp. 129
Art. 215 Feedersp. 129
Art. 220, Part II Branch-circuit and feeder calculationsp. 132
Art. 220, Part III and IV, Optional calculations and farm loadsp. 135
Art. 230 Servicesp. 136
Annex D: Examplesp. 139
Sample Calculationsp. 140
Example of a Commercial Service Calculationp. 140
Example of a Single-Family Dwelling Demand Loadp. 142
Optional Dwelling Service Calculationp. 144
Farm Building Demand Loadp. 144
Major Changes to the 2002 Codep. 145
Art. 215 and 220p. 145
Art. 230p. 146
Worksheet No. 4--Beginningp. 150
Worksheet No. 4--Advancedp. 155
Unit 5 Grounding and Bondingp. 159
Code Discussionp. 159
Art. 250 Groundingp. 159
Art. 280 Surge arrestersp. 164
Art. 285 Transient voltage surge suppressorsp. 165
Art. 680 Swimming pools, fountains, and similar installationsp. 166
Grounding and Bonding Fundamentalsp. 167
Equipment Groundingp. 167
Sizing Equipment Grounding Conductorsp. 168
Parallel Equipment Grounding Conductorsp. 169
Equipment Grounding Conductor Size Adjustmentsp. 169
Electrical Shockp. 170
Electrical System Groundingp. 171
Which Conductor of the Electrical System to Groundp. 171
Grounding Electrodep. 171
Grounding and Bonding for Service with Parallel Conductorsp. 172
Electrical System Types and Voltagesp. 174
Single-Phase Electrical Systemsp. 174
Three-Phase Electrical Systemsp. 175
High Impedance Groundingp. 176
Major Changes to the 2002 Codep. 177
Art. 250p. 177
Art. 285p. 181
Art. 680p. 181
Worksheet No. 5--Beginningp. 184
Worksheet No. 5--Advancedp. 189
Unit 6 Overcurrent Protectionp. 197
Code Discussionp. 197
Art. 240 Overcurrent protectionp. 197
Art. 408 Switchboards and panelboardsp. 202
Art. 550 Mobile homes, manufactured homes, and mobile home parksp. 203
Art. 551 Recreational vehicles and recreational vehicle parksp. 204
Art. 552 Park trailersp. 206
Overcurrent Protection Fundamentalsp. 206
Overloadsp. 206
Faultsp. 206
Symmetrical and Asymmetrical Currentp. 207
How Damage Occursp. 207
Interrupting Ratings of Fuses and Circuit-Breakersp. 208
Current Limitingp. 208
Series Ratingp. 208
Feeder Tapsp. 210
Voltage Dropp. 213
Major Changes to the 2002 Codep. 216
Art. 240p. 216
Art. 408p. 220
Art. 550p. 220
Art. 551p. 222
Art. 552p. 222
Worksheet No. 6--Beginningp. 224
Worksheet No. 6--Advancedp. 229
Unit 7 Motor-Circuit Wiringp. 235
Code Discussionp. 235
Art. 430 Motors, motor circuits, and controllersp. 235
Art. 440 Air-conditioning and refrigeration equipmentp. 236
Art. 455 Phase convertersp. 237
Art. 460 Capacitorsp. 239
Art. 470 Resistors and reactorsp. 240
Art. 675 Electrically driven or controlled irrigation machinesp. 240
Art. 685 Integrated electrical systemsp. 240
Annex D: Examplesp. 240
Motor Circuits and Calculationsp. 241
Motor Nameplate and Other Informationp. 241
Motor Circuitp. 242
Methods of Controlling Motorsp. 242
Enclosure Typesp. 243
Overcurrent Device Ratingsp. 244
Motor Overload Protectionp. 244
Remote Control Circuit Wiresp. 246
Motor-Circuit Examplesp. 246
Grounding Motors and Controllersp. 250
Motor-Control Circuit Wiringp. 250
Major Changes to the 2002 Codep. 253
Art. 430p. 253
Art. 440p. 257
Art. 455p. 259
Worksheet No. 7--Beginningp. 260
Worksheet No. 7--Advancedp. 266
Unit 8 Transformersp. 273
Code Discussionp. 273
Art. 450 Transformers and transformer vaultsp. 273
Transformer Fundamentalsp. 274
Types of Transformersp. 274
Voltage and Turns Ratiop. 274
Transformer Ratingsp. 275
Connecting Transformer Windingsp. 276
Three-Phase Transformersp. 276
Winding Tapsp. 277
Input and Output Currentp. 279
Boost and Buck Transformersp. 279
K-Rated Transformersp. 280
Overcurrent Protection for Transformersp. 281
Overcurrent Protection Only on the Primary (600 volts or less)p. 282
Primary and Secondary Overcurrent Protection (600 volts or less)p. 284
Boost and Buck Transformer Overcurrent Protectionp. 287
Transformer Tapsp. 288
Transformer Groundingp. 292
Major Changes to the 2002 Codep. 294
Art. 450p. 294
Worksheet No. 8--Beginningp. 295
Worksheet No. 8--Advancedp. 302
Unit 9 Hazardous Location Wiringp. 309
Code Discussionp. 309
Art. 500 Hazardous (classified) locationsp. 309
Art. 501 Class I locationsp. 310
Art. 502 Class II locationsp. 310
Art. 503 Class III locationsp. 310
Art. 504 Intrinsically safe systemsp. 310
Art. 505 Class I, Zone 0, 1, and 2 locationsp. 311
Art. 510 Hazardous (classified) locations, specificp. 313
Art. 511 Commercial garages, repair and storagep. 313
Art. 513 Aircraft hangarsp. 313
Art. 514 Motor fuel disposing facilitiesp. 314
Art. 515 Bulk storage plantsp. 314
Art. 516 Spray applications, dipping and coating processesp. 314
Hazardous Location Wiring Fundamentalsp. 314
Types of Hazardous Locationsp. 315
Ratings of Equipmentp. 316
Objectives of Explosion-Proof Enclosuresp. 316
Sealing Fittingsp. 317
Equipment Grounding and Bondingp. 318
Dust-Ignition-Proof Equipmentp. 318
Flammable Fibers and Flyingsp. 319
Special Occupanciesp. 319
Major Changes to the 2002 Codep. 319
Art. 500p. 319
Art. 501 and 502p. 321
Art. 503, 504, and 505p. 322
Art. 511, 513, 514 and 515p. 324
Art. 516p. 326
Worksheet No. 9--Beginningp. 327
Worksheet No. 9--Advancedp. 332
Unit 10 Health Care Facilitiesp. 337
Code Discussionp. 337
Art. 517 Health care facilitiesp. 337
Art. 660 X-ray equipmentp. 341
Art. 680 Therapeutic pools and tubsp. 341
Wiring in Hospitalsp. 341
Definition of Areas Within a Hospitalp. 341
Hospital Receptacle Requirementsp. 342
Grounding in Hospitalsp. 342
Hospital Required Electrical Systemsp. 344
Major Changes to the 2002 Codep. 344
Art. 517p. 344
Worksheet No. 10--Beginningp. 348
Worksheet No. 10--Advancedp. 352
Unit 11 Emergency and Alternate Power Systemsp. 357
Code Discussionp. 357
Art. 445 Generatorsp. 357
Art. 480 Storage batteriesp. 358
Art. 690 Solar photovoltaic systemsp. 358
Art. 692 Fuel cell systemsp. 359
Art. 695 Fire pumpsp. 359
Art. 700 Emergency systemsp. 360
Art. 701 Legally required standby systemsp. 361
Art. 702 Optional standby systemsp. 361
Art. 705 Interconnected electric power production sourcesp. 362
Emergency Electrical Systemsp. 362
Fire-Alarm Systemsp. 363
Wiring Fire-Alarm Systemsp. 364
Fire Pumpsp. 367
Alternate Electrical Power Systemsp. 369
Solar Photovoltaic Systemsp. 370
Fuel Cell Systemsp. 373
Storage Batteriesp. 375
Invertersp. 376
Generatorsp. 376
Connecting Alternate Power Sourcesp. 377
Grounding dc Power Sourcesp. 378
Direct Current Ratingp. 379
Major Changes to the 2002 Codep. 379
Art. 445, 480 and 690p. 379
Art. 692 and 695p. 382
Art. 700, 701 and 702p. 384
Art. 705 and 760p. 386
Worksheet No. 11--Beginningp. 388
Worksheet No. 11--Advancedp. 393
Unit 12 Industrial Electrical Applicationsp. 399
Code Discussionp. 399
Art. 326 Integrated gas spacer cablep. 399
Art. 368 Buswaysp. 400
Art. 370 Cablebusp. 400
Art. 392 Cable traysp. 401
Art. 427 Fixed electric heating equipment for pipelines and vesselsp. 403
Art. 610 Cranes and hoistsp. 403
Art. 630 Electric weldersp. 403
Art. 665 Induction and dielectric heating equipmentp. 405
Art. 668 Electrolytic cellsp. 406
Art. 669 Electroplatingp. 406
Art. 670 Industrial machineryp. 406
Art. 727 Instrumentation tray cablep. 406
Art. 770 Optical fiber cables and racewaysp. 407
Cable Tray Width and Conductor Ampacityp. 407
Major Changes to the 2002 Codep. 413
Art. 368p. 413
Art. 392p. 413
Art. 490, 610, and 630p. 417
Art. 665 and 670p. 418
Art. 727 and 770p. 419
Worksheet No. 12--Beginningp. 420
Worksheet No. 12--Advancedp. 425
Unit 13 Commercial Wiring Applicationsp. 431
Code Discussionp. 431
Art. 322 Flat cable assembliesp. 431
Art. 372 Cellular concrete floor racewaysp. 431
Art. 374 Cellular metal floor racewaysp. 432
Art. 380 Multioutlet assemblyp. 432
Art. 384 Strut-type channel racewayp. 433
Art. 390 Underfloor racewaysp. 435
Art. 518 Places of assemblyp. 435
Art. 545 Manufactured buildingsp. 435
Art. 600 Electric signs and outline lightingp. 435
Art. 604 Manufactured wiring systemsp. 436
Art. 620 Elevators, dumbwaiters, escalators, moving walks, and chair liftsp. 436
Art. 647 Sensitive electronic equipmentp. 438
Major Changes to the 2002 Codep. 442
Art. 322p. 442
Art. 384p. 443
Art. 390, 518, and 545p. 443
Art. 600p. 443
Art. 604 and 620p. 444
Art. 645 and 647p. 446
Worksheet No. 13--Beginningp. 448
Worksheet No. 13--Advancedp. 453
Unit 14 Special Applications Wiringp. 459
Code Discussionp. 459
Art. 520 Theaters and similar locationsp. 459
Art. 525 Carnivals, circuses, fairs, and similar eventsp. 460
Art. 530 Motion picture and television studios and similar locationsp. 461
Art. 540 Motion picture projection roomsp. 461
Art. 547 Agricultural buildingsp. 461
Art. 553 Floating buildingsp. 464
Art. 555 Marinas and boatyardsp. 464
Art. 625 Electric vehicle charging systemsp. 464
Art. 640 Audio signal processing, amplification and reproduction equipmentp. 465
Art. 650 Pipe organsp. 465
Art. 800 Communication circuitsp. 466
Art. 810 Radio and television equipmentp. 467
Art. 820 Community antenna television and radio distributionp. 467
Art. 830 Network-powered broadband communications systemsp. 467
Major Changes to the 2002 Codep. 467
Art. 520 and 525p. 468
Art. 530, 540 and 547p. 470
Art. 555p. 473
Art. 625 and 640p. 475
Art. 800p. 476
Art. 810 and 820p. 477
Art. 830p. 479
Worksheet No. 14--Beginningp. 480
Worksheet No. 14--Advancedp. 484
Unit 15 Reviewp. 489
Beginning Reviewp. 490
Advanced Reviewp. 499
Annex, Metric Conversions Tablesp. 509
Answer Sheetsp. 511
Index Including Code Articlesp. 513