Which NEC article covers hazardous (classified) locations?

• A. Article 501
• B. Article 502
• C. Article 500
• D. Article 510

Answer: (C)

Hazardous locations are governed by a single umbrella article that defines what qualifies as hazardous and provides the general requirements for installing equipment in those areas. This article sets up the classifications (such as Class I, II, III and the division concepts) and the overall approach to protection, ratings, and methods used in all subsequent hazardous-location rules. Because it provides the scope and framework that all the other articles build on, it is the best answer for where the NEC addresses hazardous (classified) locations. The other articles handle specific classes or applications within those locations, but they rely on the general article for the baseline definitions and requirements.