National Electrical Safety Code 2007 Handbook

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National Electrical Safety Code 2007 Handbook

National Electrical Safety Code 2007 Handbook

Authors: David Marne

Published: October 2006

eISBN: 9780071493611 0071493611 | ISBN: 9780071453677

Contents

Preface

Acknowledgments

General Sections

Section 01. Introduction to the National Electrical Safety Code

010. Purpose

011. Scope

012. General Rules

013. Application

014. Waiver

015. Intent

016. Effective Date

017. Units of Measure

018. Method of Calculation

Section 02. Definitions of Special Terms

Section 03. References

Section 09. Grounding Methods for Electric Supply and Communications Facilities

090. Purpose

091. Scope

092. Point of Connection of Grounding Conductor

093. Grounding Conductor and Means of Connection

094. Grounding Electrodes

095. Method of Connection to Electrode

096. Ground Resistance Requirements

097. Separation of Grounding Conductors

098. Number 098 Not Used in This Edition

099. Additional Requirements for Grounding and Bonding of Communication Apparatus

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

Section 10. Purpose and Scope of Rules

100. Purpose

101. Scope

102. Application of Rules

103. Referenced Sections

Section 11. Protective Arrangements in Electric Supply Stations

110. General Requirements

111. Illumination

112. Floors, Floor Openings, Passageways, and Stairs

113. Exits

114. Fire-Extinguishing Equipment

Section 12. Installation and Maintenance of Equipment

120. General Requirements

121. Inspections

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

123. Protective Grounding

124. Guarding Live Parts

125. Working Space About Electric Equipment

126. Equipment for Work on Energized Parts

127. Classified Locations

128. Identification

129. Mobile Hydrogen Equipment

Section 13. Rotating Equipment

130. Speed Control and Stopping Devices

131. Motor Control

132. Number 132 Not Used in This Edition

133. Short-Circuit Protection

Section 14. Storage Batteries

140. General

141. Location

142. Ventilation

143. Racks

144. Floors in Battery Areas

145. Illumination for Battery Areas

146. Service Facilities

Section 15. Transformers and Regulators

150. Current-Transformer Secondary Circuits Protection When Exceding 600 V

151. Grounding Secondary Circuits of Instrument Transformers

152. Location and Arrangement of Power Transformers and Regulators

153. Short-Circuit Protection of Power Transformers

Section 16. Conductors

160. Application

161. Electrical Protection

162. Mechanical Protection and Support

163. Isolation

164. Conductor Terminations

Section 17. Circuit Breakers, Reclosers, Switches, and Fuses

170. Arrangement

171. Application

172. Circuit Breakers, Reclosers, and Switches Containing Oil

173. Switches and Disconnecting Devices

174. Disconnection of Fuses

Section 18. Switchgear and Metal-Enclosed Bus

180. Switchgear Assemblies

181. Metal-Enclosed Bus

Section 19. Surge Arresters

190. General Requirements

191. Indoor Locations

192. Grounding Conductors

193. Installation

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

Section 20. Purpose, Scope, and Application of Rules

200. Purpose

201. Scope

202. Application of Rules

Section 21. General Requirements

210. Referenced Sections

211. Number 211 Not Used in This Edition

212. Induced Voltages

213. Accessibility

214. Inspection and Tests of Lines and Equipment

215. Grounding of Circuits, Supporting Structures, and Equipment

216. Arrangement of Switches

217. General

218. Vegetation Management

Section 22. Relations between Various Classes of Lines and Equipment

220. Relative Levels

221. Avoidance of Conflict

222. Joint Use of Structures

223. Communications Protective Requirements

224. Communication Circuits Located Within the Supply Space and Supply Circuits Located Within the Communication Space

225. Electric Railway Construction

Section 23. Clearances

230. General

231. Clearances of Supporting Structures from Other Objects

232. Vertical Clearances of Wires, Conductors, Cables, and Equipment above Ground, Roadway, Rail, or Water Surfaces

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

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

235. Clearance for Wires, Conductors, or Cables Carried on the Same Supporting Structure

236. Climbing Space

237. Working Space

238. Vertical Clearance between Certain Communication and Supply Facilities Located on the Same Structure

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

Section 24. Grades of Construction

240. General

241. Application of Grades of Construction to Different Situations

242. Grades of Construction for Conductors

243. Grades of Construction for Line Supports

Section 25. Loadings for Grades B and C

250. General Loading Requirements and Maps

251. Conductor Loading

252. Loads on Line Supports

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

Section 26. Strength Requirements

260. General (see also Section 20)

261. Grades B and C Construction

262. Number 262 Not Used in This Edition

263. Grade N Construction

264. Guying and Bracing

Section 27. Line Insulation

270. Application of Rule

271. Material and Marking

272. Ratio of Flashover to Puncture Voltage

273. Insulation Level

274. Factory Tests

275. Special Insulator Applications

276. Number 276 Not Used in This Edition

277. Mechanical Strength of Insulators

278. Aerial Cable Systems

279. Guy and Span Insulators

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

300. Purpose

301. Scope

302. Application of Rule

Section 31. General Requirements Applying to Underground Lines

310. Referenced Sections

311. Installation and Maintenance

312. Accessibility

313. Inspection and Tests of Lines and Equipment

314. Grounding of Circuits and Equipment

315. Communications Protective Requirements

316. Induced Voltage

Section 32. Underground Conduit Systems

320. Location

321. Excavation and Backfill

322. Ducts and Joints

323. Manholes, Handholes, and Vaults

Section 33. Supply Cable

330. General

331. Sheaths and Jackets

332. Shielding

333. Cable Accessories and Joints

Section 34. Cable in Underground Structures

340. General

341. Installation

342. Grounding and Bonding

343. Fireproofing

344. Communication Cables Containing Special Supply Circuits

Section 35. Direct-Buried Cable

350. General

351. Location and Routing

352. Installation

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

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

Section 36. Risers

360. General

361. Installation

362. Pole Risers–Additional Requirements

363. Pad-Mounted Installations

Section 37. Supply Cable Terminations

370. General

371. Support at Terminations

372. Identification

373. Clearances in Enclosures or Vaults

374. Grounding

Section 38. Equipment

380. General

381. Design

382. Location in Underground Structures

383. Installation

384. Grounding and Bonding

385. Identification

Section 39. Installation in Tunnels

390. General

391. Environment

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

Section 40. Purpose and Scope

400. Purpose

401. Scope

402. Referenced Sections

Section 41. Supply and Communication Systems—Rules for Employers

410. General Requirements

411. Protective Methods and Devices

Section 42. General Rules for Employees

420. Personal General Precautions

421. General Operating Routines

422. Overhead Line Operating Procedures

423. Underground Line Operating Procedures

Section 43. Additional Rules for Communications Employees

430. General

431. Approach to Energized Conductors or Parts

432. Joint-Use Structures

433. Attendant on Surface at Joint-Use Manhole

434. Sheath Continuity

Section 44. Additional Rules for Supply Employees

440. General

441. Energized Conductors or Parts

442. Switching Control Procedures

443. Work on Energized Lines and Equipment

444. De-energizing Equipment or Lines to Protect Employees

445. Protective Grounds

446. Live Work

447. Protection against Arcing and Other Damage While Installing and Maintaining Insulators and Conductors

Appendix A. Photographs of NESC Applications

Appendix B. OSHA Standards Related to the NESC Work Rules

Index