McGraw-Hill's National electrical safety code (NESC) 2007 handbook

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A Hands-on Guide to the 2007 NESC® that Clarifies Code Rules for You to Achieve Full Compliance!

McGraw-Hill's National Electrical Safety Code® 2007 Handbook delivers a rule-by-rule annotation of the NESC® that clarifies the often confusing Code text and allows you to perform your work confidently and safely. Designed for use with the Code itself, this expert resource guides readers through safety rules for the installation, operation, and maintenance of electrical supply stations and equipment, and also for overhead and underground electric supply and communication lines.

Fully updated with all the latest rules, McGraw-Hill's National Electrical Safety Code® 2007 Handbook features:

The best complete NESC® annotation currently available A rule-by-rule overview of the entire code Over 500 detailed illustrations and photographs A wealth of practical examples of code applications Concise explanations of controversial rules

Inside this Time-Saving, NESC Compliance Tool

* General Sections: Definitions * Grounding * Part 1. Rules for Installation and Maintenance of Electric Supply Stations and Equipment: Fences * Safety Signs * Storage * Working Space * Batteries * Transformers and Regulators * Conductors * Circuit Breakers, Reclosers, Switches, and Fuses * Surge Arresters * Part 2. Rules for Installation and Maintenance of Overhead Electric Supply and Communication Lines: Inspections * Clearances * Joint Use * Grades of Construction * Loadings * Strength Requirements * Line Insulation * Part 3. Rules for Installation and Maintenance of Underground Electric Supply and Communication Lines: Underground Conduit Systems * Supply Cable * Cable in Underground Structures * Direct-Buried Cable * Risers * Terminations * Part 4. Rules for Operation of Electric Supply and Communication Lines and Equipment: Employer Rules * Employee Rules * Communication Worker Rules * Supply Worker Rules * OSHA Requirements

Author Notes

David J. Marne, P.E., B.S.E.E., is a consulting electrical engineer. He is company president and senior engineer for Marne and Associates, Inc., in Missoula, Montana, where he specializes in NESC(R) training and engineering design. Mr. Marne serves on NESC(R)Subcommittee 4, Overhead Lines-Clearances, he is a senior member of the IEEE, and has presented seminars on the NESC(R) to a variety of industry professionals.

Preface	p. xiii
Acknowledgments	p. xv
General Sections
Section 01 Introduction to the National Electrical Safety Code	p. 3
010 Purpose	p. 3
011 Scope	p. 4
012 General Rules	p. 6
013 Application	p. 7
014 Waiver	p. 8
015 Intent	p. 9
016 Effective Date	p. 10
017 Units of Measure	p. 10
018 Method of Calculation	p. 11
Section 02 Definitions of Special Terms	p. 13
Section 03 References	p. 15
Section 09 Grounding Methods for Electric Supply and Communications Facilities	p. 17
090 Purpose	p. 17
091 Scope	p. 17
092 Point of Connection of Grounding Conductor	p. 18
093 Grounding Conductor and Means of Connection	p. 29
094 Grounding Electrodes	p. 35
095 Method of Connection to Electrode	p. 39
096 Ground Resistance Requirements	p. 44
097 Separation of Grounding Conductors	p. 48
098 Number 098 Not Used in This Edition	p. 52
099 Additional Requirements for Grounding and Bonding of Communication Apparatus	p. 52
Part 1 Rules for the Installation and Maintenance of Electric Supply Stations and Equipment
Section 10 Purpose and Scope of Rules	p. 57
100 Purpose	p. 57
101 Scope	p. 57
102 Application of Rules	p. 58
103 Referenced Sections	p. 58
Section 11 Protective Arrangements in Electric Supply Stations	p. 59
110 General Requirements	p. 59
111 Illumination	p. 67
112 Floors, Floor Openings, Passageways, and Stairs	p. 68
113 Exits	p. 69
114 Fire-Extinguishing Equipment	p. 70
Section 12 Installation and Maintenance of Equipment	p. 71
120 General Requirements	p. 71
121 Inspections	p. 71
122 Guarding Shaft Ends, Pulleys, Belts, and Suddenly Moving Parts	p. 72
123 Protective Grounding	p. 72
124 Guarding Live Parts	p. 73
125 Working Space About Electric Equipment	p. 76
126 Equipment for Work on Energized Parts	p. 80
127 Classified Locations	p. 81
128 Identification	p. 81
129 Mobile Hydrogen Equipment	p. 82
Section 13 Rotating Equipment	p. 83
130 Speed Control and Stopping Devices	p. 83
131 Motor Control	p. 84
132 Number 132 Not Used in This Edition
133 Short-Circuit Protection	p. 84
Section 14 Storage Batteries	p. 87
140 General	p. 87
141 Location	p. 88
142 Ventilation	p. 88
143 Racks	p. 88
144 Floors in Battery Areas	p. 89
145 Illumination for Battery Areas	p. 89
146 Service Facilities	p. 89
Section 15 Transformers and Regulators	p. 91
150 Current-Transformer Secondary Circuits Protection When Exceding 600 V	p. 91
151 Grounding Secondary Circuits of Instrument Transformers	p. 91
152 Location and Arrangement of Power Transformers and Regulators	p. 92
153 Short-Circuit Protection of Power Transformers	p. 94
Section 16 Conductors	p. 97
160 Application	p. 97
161 Electrical Protection	p. 98
162 Mechanical Protection and Support	p. 99
163 Isolation	p. 99
164 Conductor Terminations	p. 101
Section 17 Circuit Breakers, Reclosers, Switches, and Fuses	p. 103
170 Arrangement	p. 103
171 Application	p. 104
172 Circuit Breakers, Reclosers, and Switches Containing Oil	p. 106
173 Switches and Disconnecting Devices	p. 106
174 Disconnection of Fuses	p. 107
Section 18 Switchgear and Metal-Enclosed Bus	p. 109
180 Switchgear Assemblies	p. 109
181 Metal-Enclosed Bus	p. 111
Section 19 Surge Arresters	p. 115
190 General Requirements	p. 115
191 Indoor Locations	p. 115
192 Grounding Conductors	p. 116
193 Installation	p. 116
Part 2 Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines
Section 20 Purpose, Scope, and Application of Rules	p. 119
200 Purpose	p. 119
201 Scope	p. 119
202 Application of Rules	p. 120
Section 21 General Requirements	p. 123
210 Referenced Sections	p. 123
211 Number 211 Not Used in This Edition
212 Induced Voltages	p. 123
213 Accessibility	p. 123
214 Inspection and Tests of Lines and Equipment	p. 124
215 Grounding of Circuits, Supporting Structures, and Equipment	p. 126
216 Arrangement of Switches	p. 126
217 General	p. 126
218 Vegetation Management	p. 134
Section 22 Relations between Various Classes of Lines and Equipment	p. 141
220 Relative Levels	p. 141
221 Avoidance of Conflict	p. 143
222 Joint Use of Structures	p. 145
223 Communications Protective Requirements	p. 149
224 Communication Circuits Located Within the Supply Space and Supply Circuits Located Within the Communication Space	p. 149
225 Electric Railway Construction	p. 151
Section 23 Clearances	p. 153
230 General	p. 161
231 Clearances of Supporting Structures from Other Objects	p. 174
232 Vertical Clearances of Wires, Conductors, Cables, and Equipment above Ground, Roadway, Rail, or Water Surfaces	p. 177
233 Clearances between Wires, Conductors, and Cables Carried on Different Supporting Structures	p. 198
234 Clearance of Wires, Conductors, Cables, and Equipment from Buildings, Bridges, Rail Cars, Swimming Pools, and Other Installations	p. 210
235 Clearance for Wires, Conductors, or Cables Carried on the Same Supporting Structure	p. 227
236 Climbing Space	p. 247
237 Working Space	p. 253
238 Vertical Clearance between Certain Communication and Supply Facilities Located on the Same Structure	p. 254
239 Clearance of Vertical and Lateral Facilities from Other Facilities and Surfaces on the Same Supporting Structure	p. 260
Section 24 Grades of Construction	p. 281
240 General	p. 281
241 Application of Grades of Construction to Different Situations	p. 283
242 Grades of Construction for Conductors	p. 284
243 Grades of Construction for Line Supports	p. 287
Section 25 Loadings for Grades B and C	p. 291
250 General Loading Requirements and Maps	p. 291
251 Conductor Loading	p. 297
252 Loads on Line Supports	p. 300
253 Load Factors for Structures, Crossarms, Support Hardware, Guys, Foundations, and Anchors	p. 308
Section 26 Strength Requirements	p. 311
260 General (see also Section 20)	p. 311
261 Grades B and C Construction	p. 315
262 Number 262 Not Used in This Edition	p. 328
263 Grade N Construction	p. 328
264 Guying and Bracing	p. 329
Section 27 Line Insulation	p. 339
270 Application of Rule	p. 339
271 Material and Marking	p. 339
272 Ratio of Flashover to Puncture Voltage	p. 340
273 Insulation Level	p. 341
274 Factory Tests	p. 342
275 Special Insulator Applications	p. 342
276 Number 276 Not Used in This Edition	p. 343
277 Mechanical Strength of Insulators	p. 344
278 Aerial Cable Systems	p. 344
279 Guy and Span Insulators	p. 344
Section 28 Section Number 28 Not Used in This Edition
Section 29 Section Number 29 Not Used in This Edition
Part 3 Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines
Section 30 Purpose, Scope, and Application of Rules	p. 351
300 Purpose	p. 351
301 Scope	p. 351
302 Application of Rule	p. 353
Section 31 General Requirements Applying to Underground Lines	p. 355
310 Referenced Sections	p. 355
311 Installation and Maintenance	p. 355
312 Accessibility	p. 357
313 Inspection and Tests of Lines and Equipment	p. 359
314 Grounding of Circuits and Equipment	p. 359
315 Communications Protective Requirements	p. 359
316 Induced Voltage	p. 359
Section 32 Underground Conduit Systems	p. 363
320 Location	p. 363
321 Excavation and Backfill	p. 373
322 Ducts and Joints	p. 373
323 Manholes, Handholes, and Vaults	p. 373
Section 33 Supply Cable	p. 385
330 General	p. 385
331 Sheaths and Jackets	p. 385
332 Shielding	p. 386
333 Cable Accessories and Joints	p. 386
Section 34 Cable in Underground Structures	p. 389
340 General	p. 389
341 Installation	p. 389
342 Grounding and Bonding	p. 393
343 Fireproofing	p. 396
344 Communication Cables Containing Special Supply Circuits	p. 396
Section 35 Direct-Buried Cable	p. 399
350 General	p. 399
351 Location and Routing	p. 401
352 Installation	p. 403
353 Deliberate Separations-Equal to or Greater Than 300 mm (12 in) from Underground Structures or Other Cables	p. 407
354 Random Separation-Separation Less Than 300 mm (12 in) from Underground Structures or Other Cables	p. 409
Section 36 Risers	p. 413
360 General	p. 413
361 Installation	p. 413
362 Pole Risers-Additional Requirements	p. 413
363 Pad-Mounted Installations	p. 414
Section 37 Supply Cable Terminations	p. 419
370 General	p. 419
371 Support at Terminations	p. 420
372 Identification	p. 420
373 Clearances in Enclosures or Vaults	p. 421
374 Grounding	p. 422
Section 38 Equipment	p. 423
380 General	p. 423
381 Design	p. 424
382 Location in Underground Structures	p. 428
383 Installation	p. 429
384 Grounding and Bonding	p. 429
385 Identification	p. 430
Section 39 Installation in Tunnels	p. 431
390 General	p. 431
391 Environment	p. 431
Part 4 Rules for the Operation of Electric Supply and Communications Lines and Equipment
Section 40 Purpose and Scope	p. 435
400 Purpose	p. 435
401 Scope	p. 435
402 Referenced Sections	p. 437
Section 41 Supply and Communication Systems-Rules for Employers	p. 439
410 General Requirements	p. 440
411 Protective Methods and Devices	p. 442
Section 42 General Rules for Employees	p. 445
420 Personal General Precautions	p. 446
421 General Operating Routines	p. 454
422 Overhead Line Operating Procedures	p. 456
423 Underground Line Operating Procedures	p. 457
Section 43 Additional Rules for Communications Employees	p. 461
430 General	p. 464
431 Approach to Energized Conductors or Parts	p. 464
432 Joint-Use Structures	p. 465
433 Attendant on Surface at Joint-Use Manhole	p. 466
434 Sheath Continuity	p. 466
Section 44 Additional Rules for Supply Employees	p. 467
440 General	p. 470
441 Energized Conductors or Parts	p. 470
442 Switching Control Procedures	p. 473
443 Work on Energized Lines and Equipment	p. 477
444 De-energizing Equipment or Lines to Protect Employees	p. 482
445 Protective Grounds	p. 486
446 Live Work	p. 487
447 Protection against Arcing and Other Damage While Installing and Maintaining Insulators and Conductors	p. 489
Appendix A Photographs of NESC Applications	p. 491
Appendix B OSHA Standards Related to the NESC Work Rules	p. 557
Index	p. 745

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