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WIRING FOR HAZARDOUS (CLASSIFIED) LOCATIONS
WIRING FOR HAZARDOUS (CLASSIFIED) LOCATIONSWIRING FOR HAZARDOUS (CLASSIFIED) LOCATIONS411. Hazardous location classifications (Adapted from Practical Electrical Wiring, 21st ed., © Park Publishing, 2011, all rights reserved) arise because of the presence or handling of explosive gases, liquids, flammable dusts, or easily ignitable fibers. The basic rules for wiring in such locations are covered by NEC Articles 500 through 506, and more specific information is covered in Articles 510 through 517—altogether more than 88 pages. This handbook can discuss only the barest details of this intricate subject.The NEC uses three basic classes to indicate the type of hazard involved, and those classes (I, II, and III) are further subdivided into divis…
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