McGraw Hill's National Electrical Safety Code (NESC) 2023 Handbook

by John A. Palmer, David J. Marne

Overview

Up-to-date, rule-by-rule clarification of the requirements in the 2023 NESC®

Designed to be used alongside the code itself, McGraw Hill’s National Electrical Safety Code® (NESC®) 2023 Handbook has been fully updated to reflect the changes in the 2023 NESC. You will gain access to straightforward, ready-to-apply code clarification, enabling you to work safely and efficiently, and achieve full compliance. The book offers concise summaries of complicated and confusing issues as well as hundreds of diagrams, photos, and practical examples.

COVERAGE INCLUDES:

General Sections:

Introduction * definitions * references * grounding methods

Safety Rules for the Installation and Maintenance of Electric Supply Stations and Equipment:

Purpose and scope * protective arrangements * installation and maintenance * rotating equipment * storage batteries * transformers and regulators * conductors * circuit breakers and other equipment *switchgear * photovoltaic generating stations

Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines:

Purpose and scope * general requirements * classes of lines and equipment * clearances * grades of construction * structural loadings * strength requirements * line insulation

Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines:

Purpose and scope * general requirements * underground conduit systems * supply cable * cable in underground structures * direct-buried cable and cable in duct * risers * terminations * equipment * installation in tunnels

Work Rules for the Operation of Electric Supply and Communication Lines and Equipment:

Purpose and scope * employer rules * employee rules * additional rules for communication employees * additional rules for supply employees

Product Details

ISBN-13:	9781264257188
Publisher:	McGraw Hill LLC
Publication date:	12/21/2022
Pages:	720
Sales rank:	401,279
Product dimensions:	6.10(w) x 9.00(h) x 1.20(d)

About the Author

David J. Marne, P.E., B.S.E.E., is a nationally recognized speaker on the National Electrical Safety Code (NESC). He serves on multiple NESC technical subcommittees and is president and senior electrical engineer for Marne and Associates, Inc., where he specializes in NESC training and expert witness services. Mr. Marne has more than 39 years of experience in the utility industry and is a senior member of the IEEE.

John A. Palmer, Ph.D., P.E., C.F.E.I., has been President of Palmer Engineering and Forensics, a multidisciplinary forensic and consulting engineering firm based in North Salt Lake, Utah since 2009 and has been performing work in the field of forensic engineering since 2001, with extensive applications to the NESC. Dr. Palmer is also an experienced teacher in the area of electric power engineering spanning multiple decades and multiple universities, currently at the University of Utah. Dr. Palmer is a registered Professional Engineer in multiple states and a senior member of the IEEE.

Table of Contents

Preface xiii

Acknowledgments xv

General Sections

Section 01 Introduction to the National Electrical Safety Code 3

010 Purpose 3

011 Scope 6

012 General Rules 9

013 Application 9

014 Waiver for Emergency and Temporary Installations 12

015 Intent 12

016 Effective Date 14

017 Units of Measure 14

018 Method of Calculation 15

Section 02 Definitions of Special Terms 17

Section 03 References 19

Section 09 Grounding Methods for Electric Supply and Communications Facilities 21

090 Purpose 21

091 Scope 21

092 Point of Connection of Grounding Conductor 22

093 Grounding Conductor and Means of Connection 33

094 Grounding Electrodes 43

095 Method of Connection to Electrode 50

096 Ground Resistance Requirements 52

097 Separation of Grounding Conductors 56

098 Number 098 Not Used in This Edition 60

099 Additional Requirements for Grounding and Bonding of Communication Apparatus 60

Part 1 Safety Rules for the Installation and Maintenance of Electric Supply Stations and Equipment

Section 10 Purpose and Scope of Rules 65

100 Purpose 65

101 Scope 65

102 Application of Rules 69

103 Referenced Sections 69

Section 11 Protective Arrangements in Electric Supply Stations 71

110 General Requirements 71

111 Illumination 84

112 Floors, Floor Openings, Passageways, and Stairs 86

113 Exits 87

Section 12 Installation and Maintenance of Equipment 89

120 General Requirements 89

121 Inspections 89

122 Guarding Shaft Ends, Pulleys, Belts, and Suddenly Moving Parts 90

123 Protective Grounding 90

124 Guarding Live Parts 91

125 Working Space about Electric Equipment 97

126 Equipment for Work on Energized Parts 97

127 Classified Locations 100

128 Identification 101

129 Mobile Hydrogen Equipment 102

Section 13 Rotating Equipment 103

130 Speed Control and Stopping Devices 103

131 Motor Control 104

132 Number 132 Not Used in This Edition 105

133 Short-Circuit Protection 105

Section 14 Storage Batteries 107

140 General 107

141 Switchgear and Plant Batteries 109

142 Grid Storage Batteries 109

Section 15 Transformers and Regulators 111

150 Current-Transformer Secondary Circuits Protection When Exceeding 600 V 111

151 Grounding Secondary Circuits of Instrument Transformers 111

152 Location and Arrangement of Power Transformers and Regulators 112

153 Short-Circuit Protection of Power Transformers 115

Section 16 Conductors 119

160 Application 119

161 Electrical Protection 120

162 Mechanical Protection and Support 121

163 Isolation 122

164 Conductor Terminations 122

Section 17 Circuit Breakers, Reclosers, Switches, Fuses, and Other Equipment 125

170 General 125

171 Arrangement 125

172 Application 127

173 Circuit Breakers, Reclosers, and Switches Containing Oil 128

174 Switches and Disconnecting Devices 128

175 Disconnection of Fuses 129

176 Open Gaps and Breaks 129

177 Arresters 129

Section 18 Switchgear and Metal-Enclosed Bus 131

180 Switchgear Assemblies 131

181 Metal-Enclosed Bus 135

Section 19 Photovoltaic Generating Stations 137

190 General 137

191 Location 137

192 Grounding Configurations 138

193 Vegetation Management 139

194 DC Overcurrent Protection 139

195 DC Conductors 139

Part 2 Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines

Section 20 Purpose, Scope, and Application of Rules 143

200 Purpose 143

201 Scope 143

202 Application of Rules 146

Section 21 General Requirements 147

210 Referenced Sections 147

211 Number 211 Not Used in This Edition 147

212 Induced Voltages 147

213 Accessibility 148

214 Inspection and Tests of Lines and Equipment 148

215 Grounding and Bonding 151

216 Arrangement of Switches 158

217 General 159

218 Vegetation Management 167

Section 22 Relations between Various Classes of Lines and Equipment 171

220 Relative Levels 171

221 Avoidance of Conflict 177

222 Joint Use of Structures 178

223 Communications Protective Requirements 180

224 Communication Circuits Located within the Supply Space and Supply Circuits Located within the Communication Space 180

225 Electric Railway Construction 181

Section 23 Clearances 185

230 General 194

231 Clearances of Supporting Structures from Other Objects 207

232 Vertical Clearances of Wires, Conductors, Cables, and Equipment Aboveground, Roadway, Rail, or Water Surfaces 212

233 Clearances between Wires, Conductors, and Cables Carried on Different Supporting Structures 236

234 Clearance of Wires, Conductors, Cables, and Equipment from Buildings, Bridges, Rail Cars, Swimming Pools, Supporting Structures, and Other Installations 247

235 Clearance for Wires, Conductors, or Cables Carried on The Same Supporting Structure 273

236 Climbing Space 297

237 Working Space 304

238 Clearances at the Support between Specified Communications and Supply Facilities Located on the Same Structure 305

239 Clearance of Vertical and Lateral Facilities from Other Facilities and Surfaces on the Same Supporting Structure 324

Section 24 Grades of Construction 335

240 General 335

241 Application of Grades of Construction to Different Situations 337

242 Grades of Construction for Conductors 340

243 Grades of Construction for Line Supports 343

Section 25 Structural Loadings for Grades B and C 345

250 General Loading Requirements and Maps 345

251 Conductor Loading 352

252 Loads on Line Supports 355

253 Load Factors for Structures, Crossarms, Support Hardware, Guys, Foundations, and Anchors 363

Section 26 Strength Requirements 367

260 General (see also Section 20) 367

261 Grades B and C Construction 376

262 Number 262 Not Used in This Edition 400

263 Grade N Construction 400

264 Guying and Bracing 400

Section 27 Line Insulation 405

270 Application of Rule 405

271 Material and Marking 406

272 Ratio of Flashover to Puncture Voltage 406

273 Insulation Level 408

274 Factory Tests 408

275 Special Insulator Applications 408

276 Number 276 Not Used in This Edition 409

277 Mechanical Strength of Insulators 409

278 Aerial Cable Systems 411

279 Guy and Span Insulators 411

Section 28 Section Number 28 Not Used in This Edition 414

Section 29 Section Number 29 Not Used in This Edition 414

Part 3 Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines

Section 30 Purpose, Scope, and Application of Rules 417

300 Purpose 417

301 Scope 417

302 Application of Rule 419

Section 31 General Requirements Applying to Underground Lines 421

310 Referenced Sections 421

311 Installation and Maintenance 421

312 Accessibility 423

313 Inspection and Tests of Lines and Equipment 425

314 Grounding of Circuits and Equipment 425

315 Communications Protective Requirements 428

316 Induced Voltage 428

Section 32 Underground Conduit Systems 429

320 Location 429

321 Excavation and Backfill 438

322 Conduit, Ducts, and Joints 438

323 Manholes, Handholes, and Vaults 441

Section 33 Supply Cable 453

330 General 453

331 Sheaths and Jackets 453

332 Shielding 454

333 Cable Accessories and Joints 454

Section 34 Cable in Underground Structures 457

340 General 457

341 Installation 457

342 Grounding and Bonding 465

343 Number 343 Not Used in This Edition 465

344 Communication Cables Containing Special Supply Circuits 465

Section 35 Direct-Buried Cable and Cable in Duct Not Part of a Conduit System 467

350 General 467

351 Location and Routing 470

352 Installation 473

353 Deliberate Separations-Equal to or Greater Than 12 in (300 mm) from Underground Structures or Other Cables 477

354 Random Separation-Separation Less Than 12 in (300 mm) from Underground Structures or Other Cables 479

355 Additional Rules for Duct Not Part of a Conduit System 484

Section 36 Risers 485

360 General 485

361 Installation 485

362 Pole Risers-Additional Requirements 487

363 Pad-Mounted Installations 490

Section 37 Supply Cable Terminations 491

370 General 491

371 Support at Terminations 492

372 Identification 492

373 Clearances in Enclosures or Vaults 493

374 Grounding 494

Section 38 Equipment 495

380 General 495

381 Design 497

382 Location in Underground Structures 500

383 Installation 501

384 Grounding and Bonding 501

385 Identification 502

Section 39 Installation in Tunnels 503

390 General 503

391 Environment 504

Part 4 Work Rules for the Operation of Electric Supply and Communications Lines and Equipment

Section 40 Purpose and Scope 507

400 Purpose 507

401 Scope 508

402 Referenced Sections 509

Section 41 Supply and Communications Systems-Rules for Employers 513

410 General Requirements 515

411 Protective Methods and Devices 517

Section 42 General Rules for Employees 521

420 General 523

421 General Operating Routines 531

422 Overhead Line Operating Procedures 533

423 Underground Line Operating Procedures 535

Section 43 Additional Rules for Communications Employees 539

430 General 544

431 Approach to Energized Conductors or Parts 544

432 Joint-Use Structures 546

433 Attendant on Surface at Joint-Use Manhole 546

434 Sheath Continuity 547

Section 44 Additional Rules for Supply Employees 549

440 General 554

441 Energized Conductors or Parts 554

442 Switching Control Procedures 557

443 Work on Energized Lines and Equipment 561

444 De-Energizing Equipment or Lines to Protect Employees 566

445 Protective Grounds 570

446 Live Work 572

447 Protection Against Arcing and Other Damage While Installing and Maintaining Insulators and Conductors 574

Appendix. Photographs of NESC Applications 575

Index 679