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National Electric Safety Code (NESC), 1997 Edition, 1997
- Title Page (1997 NESC)
- 01 Introduction to the National Electrical Safety Code® [Go to Page]
- 010. Purpose
- 011. Scope
- 012. General Rules
- 013. Application
- 014. Waiver
- 015. Intent
- 016. Effective Date
- 017. Units of Measure
- 02 Definitions of Special Terms
- 03 References
- 09 Grounding Methods for Electric Supply and Communications Facilities [Go to Page]
- 90. Purpose
- 91. Scope
- 92. Point of Connection of Grounding Conductor
- 93. Grounding Conductor and Means of Connection
- 94. Grounding Electrodes
- 95. Method of Connection to Electrode
- 96. Ground Resistance Requirements
- 97. Separation of Grounding Conductors
- 98. Number 98 not used in this edition.
- 99. Additional Requirements for Communication Apparatus
- 10 Purpose and Scope of Rules [Go to Page]
- 100. Purpose
- 101. Scope
- 11 Protective Arrangements in Electric Supply Stations [Go to Page]
- 110. General Requirements
- 111. Illumination
- 112. Floors, Floor Openings, Passageways, and Stairs
- 113. Exits
- 114. Fire-Extinguishing Equipment
- 12 Installation and Maintenance of Equipment [Go to Page]
- 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
- 13 Rotating Equipment [Go to Page]
- 130. Speed Control and Stopping Devices
- 131. Motor Control
- 132. Number 132 not used in this edition.
- 133. Short-Circuit Protection
- 14 Storage Batteries [Go to Page]
- 140. General
- 141. Location
- 142. Ventilation
- 143. Racks
- 144. Floors in Battery Areas
- 145. Illumination for Battery Areas
- 146. Service Facilities
- 147. Number 147 not used in this edition.
- 15 Transformers and Regulators [Go to Page]
- 150. Current-Transformer Secondary Circuits Protection When Exceeding 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
- 16 Conductors [Go to Page]
- 160. Application
- 161. Electrical Protection
- 162. Mechanical Protection and Support
- 163. Isolation
- 164. Conductor Terminations
- 17 Circuit Breakers, Reclosers, Switches, and Fuses [Go to Page]
- 170. Arrangement
- 171. Application
- 172. Circuit Breakers, Reclosers, and Switches Containing Oil
- 173. Switches and Disconnecting Devices
- 174. Disconnection of Fuses
- 18 Switchgear and Metal-Enclosed Bus [Go to Page]
- 180. Switchgear Assemblies
- 181. Metal-Enclosed Bus
- 20 Purpose, Scope, and Application of Rules [Go to Page]
- 200. Purpose
- 201. Scope
- 202. Application of Rules
- 21 General Requirements [Go to Page]
- 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. Tree Trimming
- 22 Relations Between Various Classes of Lines and Equipment [Go to Page]
- 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 th...
- 225. Electric Railway Construction
- 23 Clearances [Go to Page]
- 230. General
- 231. Clearances of Supporting Structures From Other Objects
- 232. Vertical Clearances of Wires, Conductors, Cables, and Equipment Above Ground, Roadway, Rail,...
- 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, Sw...
- 235. Clearance for Wires, Conductors, or Cables Carried on the Same Supporting Structure
- 236. Climbing Space
- 237. Working Space
- 238. Vertical Clearance Between Certain Communications and Supply Facilities Located on the Same ...
- 239. Clearance of Vertical and Lateral Facilities From Other Facilities and Surfaces on the Same ...
- 24 Grades of Construction [Go to Page]
- 240. General
- 241. Application of Grades of Construction to Different Situations
- 242. Grades of Construction for Conductors
- 243. Grades of Construction for Line Supports
- 25 Loadings for Grades B and C [Go to Page]
- 250. General Loading Requirements and Maps
- 251. Conductor Loading
- 252. Loads on Line Supports
- 253. Overload Factors for Structures, Crossarms, Guys, Foundations, and Anchors
- 26 Strength Requirements [Go to Page]
- 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
- 27 Line Insulation [Go to Page]
- 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. Protection Against Arcing and Other Damage
- 277. Mechanical Strength of Insulators
- 278. Aerial Cable Systems
- 279. Guy and Span Insulators
- Section number 28 not used in this edition.
- 30 Purpose, Scope, and Application of Rules [Go to Page]
- 300. Purpose
- 301. Scope
- 302. Application of Rules
- 31 General Requirements Applying to Underground Lines [Go to Page]
- 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
- 32 Underground Conduit Systems [Go to Page]
- 320. Location
- 321. Excavation and Backfill
- 322. Ducts and Joints
- 323. Manholes, Handholes, and Vaults
- 33 Supply Cable [Go to Page]
- 330. General
- 331. Sheaths and Jackets
- 332. Shielding
- 333. Cable Accessories and Joints
- 34 Cable in Underground Structures [Go to Page]
- 340. General
- 341. Installation
- 342. Grounding and Bonding
- 343. Fireproofing
- 344. Communication Cables Containing Special Supply Circuits
- 35 Direct-Buried Cable [Go to Page]
- 350. General
- 351. Location and Routing
- 36 Risers [Go to Page]
- 360. General
- 361. Installation
- 362. Pole Risers—Additional Requirements
- 363. Pad-Mounted Installations
- 37 Supply Cable Terminations [Go to Page]
- 370. General
- 371. Support at Terminations
- 372. Identification
- 373. Clearances in Enclosures or Vaults
- 374. Grounding
- 38 Equipment [Go to Page]
- 380. General
- 381. Design
- 382. Location in Underground Structures
- 383. Installation
- 384. Grounding
- 385. Identification
- 39 Installation in Tunnels [Go to Page]
- 390. General
- 391. Environment
- 40 Purpose and Scope [Go to Page]
- 400. Purpose
- 401. Scope
- 402. Referenced Sections
- 41 Supply and Communications Systems--Rules for Employers [Go to Page]
- 410. General Requirements
- 411. Protective Methods and Devices
- 42 General Rules for Employees [Go to Page]
- 420. Personal General Precautions
- 421. General Operating Routines
- 422. Overhead Line Operating Procedures
- 423. Underground Line Operating Procedures
- 43 Additional Rules for Communications Employees [Go to Page]
- 430. General
- 431. Approach to Energized Conductors or Parts
- 432. Joint-Use Structures
- 433. Attendant on Surface at Joint-Use Manhole
- 434. Sheath Continuity
- 44 Additional Rules for Supply Employees [Go to Page]
- 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
- Appendix A: Uniform System of Clearances Adopted in the 1990 Edition
- Appendix B: Bibliography
- Index
- Working Group Assignments
- Amendments [Go to Page]