NEC Code Basics

Understanding Requirements for Hazardous Locations

Understanding Art. 500 is essential to correctly applying the many other Code rules found in Chapter 5.

A hazardous (classified) location is an area where the possibility of fire or explosion exists because of flammable or combustible gases or vapors, combustible dusts, or easily ignitable fibers/flyings. Article 500 contains a general background on hazardous (classified) locations, and it describes the differences between Class I, II, and III locations as well as the difference between Division 1 and Division 2 in each of the three classifications (Fig. 1). This gives you a

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