– Active. The 2017 NESC(R) Handbook, Premier Edition, is an essential companion to the Code. This handbook includes text directly from Code which provides users an easy reference back to the code, ruling-by-ruling. It gives users insight into what lies behind the NESC’s rules and how to apply them. The Handbook was developed for use at many levels in the electric and communication industries, including those involved in system design, construction, maintenance, inspection, standards development and worker training. The Handbook also discusses how the NESC Committee has developed the rules in the Code and responded to change proposals during the past 100 years. This allows users to understand how questions they may have were dealt with in the past. The Premier Edition includes: • Revising the purpose rule to include only the safeguarding of persons and utility facilities and clarifying the application rules. • Deleting unused definitions and adding definitions for communication and supply space. • Revising the substation impenetrable fence requirements. • Adding an exception to exempt underground cable grounding requirements from the 4 grounds in each mile rule under certain conditions. • Revising and reorganizing the guy insulator placement rules along with eliminating the voltage transfer requirements associated with them. • Requiring a 40” vertical clearance from communication cables in the communication space if a luminaire is not effectively grounded. • Deleting the conductance requirement for underground insulating jacketed grounded neutral supply cables and revising the grounding and bonding rules for supply and communication cables in random separation installations. • Revising and reorganizing the Grades of Construction Table 242-1 that will now include service drops. • Revising the strength rules to require that all conductors be considered for damage due to Aeolian vibration. • Revising the rules in Part 4 to align with changes made to 29 CFR by the Occupational Safety and Health Administration (OSHA).

PDF Catalog

PDF Pages	PDF Title
1	National Electrical Safety Code® (NESC®) Front Cover
2	Title page
4	Acknowledgment
5	About the Premier Edition Handbook
7	About the Contributors and Reviewers
14	Contents
33	Figures
38	Tables
42	Letter symbols for units
44	Section 1. Introduction to the National Electrical Safety Code®
47	010. Purpose
49	011. Scope
53	012. General rules
54	013. Application
57	014. Waiver for emergency and temporary installations
58	015. Intent
59	016. Effective date
60	017. Units of measure
61	018. Method of calculation
62	Section 2. Definitions of special terms
78	Section 3. References
81	Section 9. Grounding methods for electric supply and communications facilities 090. Purpose 091. Scope
82	092. Point of connection of grounding conductor
91	093. Grounding conductor and means of connection
98	094. Grounding electrodes
106	095. Method of connection to electrode
108	096. Ground resistance requirements
114	097. Separation of grounding conductors
123	098. Number 098 not used in this edition.
124	099. Additional requirements for grounding and bonding of communication apparatus
127	Part 1. Safety Rules for the Installation and Maintenance of Electric Supply Stations and Equipment
128	Section 10. Purpose and scope of rules 100. Purpose 101. Scope
129	102. Application of rules
130	103. Referenced sections
131	Section 11. Protective arrangements in electric supply stations 110. General requirements
145	111. Illumination
149	112. Floors, floor openings, passageways, and stairs
152	113. Exits
156	Section 12. Installation and maintenance of equipment 120. General requirements 121. Inspections
158	122. Guarding shaft ends, pulleys, belts, and suddenly moving parts 123. Protective grounding
160	124. Guarding live parts
179	125. Working space about electric equipment
181	126. Equipment for work on energized parts
182	127. Classified locations
185	128. Identification
186	129. Mobile hydrogen equipment
187	Section 13. Rotating equipment 130. Speed control and stopping devices
189	131. Motor control 132. Number 132 not used in this edition.
190	133. Short-circuit protection
191	Section 14. Storage batteries 140. General 141. Location 142. Ventilation
192	143. Racks 144. Floors in battery areas
193	145. Illumination for battery areas 146. Service facilities
194	Section 15. Transformers and regulators 150. Current-transformer secondary circuits protection when exceeding 600 V 151. Grounding secondary circuits of instrument transformers
195	152. Location and arrangement of power transformers and regulators
196	153. Short-circuit protection of power transformers
198	Section 16. Conductors 160. Application 161. Electrical protection
200	162. Mechanical protection and support
201	163. Isolation
202	164. Conductor terminations
203	Section 17. Circuit breakers, reclosers, switches, and fuses 170. Arrangement 171. Application
204	172. Circuit breakers, reclosers, and switches containing oil 173. Switches and disconnecting devices
206	174. Disconnection of fuses
207	Section 18. Switchgear and metal-enclosed bus 180. Switchgear assemblies
210	181. Metal-enclosed bus
212	Section 19. Surge arresters 190. General requirements
213	191. Indoor locations 192. Grounding conductors
214	193. Installation
215	Part 2. Safety Rules for the Installation and Maintenance of Overhead Electric Supply and Communication Lines
218	Section 20. Purpose, scope, and application of rules 200. Purpose 201. Scope
219	202. Application of rules
220	Section 21. General requirements 210. Referenced sections 211. Number 211 not used in this edition. 212. Induced voltages
221	213. Accessibility 214. Inspection and tests of lines and equipment
223	215. Grounding of circuits, supporting structures, and equipment
230	216. Arrangement of switches
231	217. General
237	218. Vegetation management
239	Section 22. Relations between various classes of lines and equipment 220. Relative levels
243	221. Avoidance of conflict
245	222. Joint use of structures
246	223. Communications protective requirements
247	224. Communication circuits located within the supply space and supply circuits located within the communication space
249	225. Electric railway construction
253	Section 23. Clearances 230. General
268	231. Clearances of supporting structures from other objects
276	232. Vertical clearances of wires, conductors, cables, and equipment above ground, roadway, rail, or water surfaces
333	233. Clearances between wires, conductors, and cables carried on different supporting structures
358	234. Clearance of wires, conductors, cables, and equipment from buildings, bridges, rail cars, swimming pools, and other installations
415	235. Clearance for wires, conductors, or cables carried on the same supporting structure
454	236. Climbing space
461	237. Working space
465	238. Vertical clearance between specified communications and supply facilities located on the same structure
472	239. Clearance of vertical and lateral facilities from other facilities and surfaces on the same supporting structure
485	Section 24. Grades of construction 240. General
486	241. Application of grades of construction to different situations
488	242. Grades of construction for conductors
494	243. Grades of construction for line supports
496	Section 25. Loadings for Grades B and C 250. General loading requirements and maps
520	251. Conductor loading
522	252. Loads on line supports
529	253. Load factors for structures, crossarms, support hardware, guys, foundations, and anchors
531	Section 26. Strength requirements
533	260. General (see also Section 20)
535	261. Grades B and C construction
559	262. Number 262 not used in this edition.
561	263. Grade N construction
564	264. Guying and bracing
568	Section 27. Line insulation 270. Application of rule 271. Material and marking 272. Ratio of flashover to puncture voltage
569	273. Insulation level
570	274. Factory tests 275. Special insulator applications
571	276. Number 276 not used in this edition. 277. Mechanical strength of insulators
574	278. Aerial cable systems 279. Guy and span insulators
578	Section number 28 not used in this edition.
579	Section number 29 not used in this edition.
580	Part 3. Safety Rules for the Installation and Maintenance of Underground Electric Supply and Communication Lines
584	Section 30. Purpose, scope, and application of rules 300. Purpose 301. Scope 302. Application of rules
585	Section 31. General requirements applying to underground lines 310. Referenced sections 311. Installation and maintenance 312. Accessibility
586	313. Inspection and tests of lines and equipment 314. Grounding of circuits and equipment
587	315. Communications protective requirements
588	316. Induced voltage
589	Section 32. Underground conduit systems 320. Location
592	321. Excavation and backfill 322. Conduit, ducts, and joints
594	323. Manholes, handholes, and vaults
600	Section 33. Supply cable 330. General 331. Sheaths and jackets 332. Shielding
601	333. Cable accessories and joints
602	Section 34. Cable in underground structures 340. General 341. Installation
605	342. Grounding and bonding 343. Number 343 not used in this edition. 344. Communication cables containing special supply circuits
606	Section 35. Direct-buried cable and cable in duct not part of a conduit system 350. General
608	351. Location and routing
609	352. Installation
611	353. Deliberate separations—Equal to or greater than 300 mm (12 in) from underground structures or other cables
612	354. Random separation—Separation less than 300 mm (12 in) from underground structures or other cables
619	355. Additional rules for duct not part of a conduit system
620	Section 36. Risers 360. General 361. Installation 362. Pole risers—Additional requirements 363. Pad-mounted installations
621	Section 37. Supply cable terminations 370. General 371. Support at terminations 372. Identification
622	373. Clearances in enclosures or vaults 374. Grounding
623	Section 38. Equipment 380. General 381. Design
625	382. Location in underground structures 383. Installation
626	384. Grounding and bonding
627	385. Identification
628	Section 39. Installation in tunnels 390. General 391. Environment
630	Part 4. Work Rules for the Operation of Electric Supply and Communications Lines and Equipment
632	Section 40. Purpose and scope 400. Purpose 401. Scope
633	402. Referenced sections
634	Section 41. Supply and communications systems—Rules for employers 410. General requirements
641	411. Protective methods and devices
644	Section 42. General rules for employees 420. General
652	421. General operating routines
653	422. Overhead line operating procedures
654	423. Underground line operating procedures
657	Section 43. Additional rules for communications employees 430. General 431. Approach to energized conductors or parts
660	432. Joint-use structures 433. Attendant on surface at joint-use manhole
661	434. Sheath continuity
662	Section 44. Additional rules for supply employees 440. General 441. Energized conductors or parts
680	442. Switching control procedures
682	443. Work on energized lines and equipment
685	444. De-energizing equipment or lines to protect employees
688	445. Protective grounds
690	446. Live work
691	447. Protection against arcing and other damage while installing and maintaining insulators and conductors
692	NESC Appendix A—Uniform system of clearances adopted in the 1990 Code
698	NESC Appendix B—Uniform clearance calculations for conductors under ice and wind conditions adopted in the 2007 Code
701	NESC Appendix C—Example applications for Rule 250C Tables 250-2 and 250-3
715	NESC Appendix D—Determining maximum anticipated per-unit overvoltage factor (T) at the worksite
716	NESC Appendix E—Bibliography
721	Handbook Appendix A—Reviewers and Policy
722	Handbook Appendix B—Safety Signs
731	Handbook Appendix C—Metric Conversions
734	Handbook Appendix D—Cross References of Major OSHA and NESC Requirements
735	Handbook Appendix E—Application of the NESC Grandfather Clause
740	Handbook Appendix F—Scheduling Corrections of Noncompliant Conditions Identified During Inspections or Work Activities
747	Handbook Appendix G—Online Sources for NESC Revisions, NESC Tentative Interim Amendments, Official NESC Interpretations, NESC Errata, and Other Useful Information and Data
748	Handbook Appendix H—Major Changes in the 2017 NESC Rules and Tables
754	Back Cover

Published By	Publication Date	Number of Pages
IEEE	2017	754


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Standard Title	2017 NESC(R) Handbook, Premier Edition
Published Code	IEEE
Publication Date	2017
Pages Count	754

IEEE NESC HBK-2017

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