Classified locations are defined under which article?

Classified locations refer to areas where flammable gases, vapors, liquids, combustible dusts, or ignitable fibers are present. These locations are specifically defined under Article 500 and further detailed in related articles. In particular, Article 510 and Article 511 deal with classified locations concerning hazardous (classified) locations.

Article 510 addresses locations that could contain flammable gases or vapors, specifically in areas such as refineries or gas plants. On the other hand, Article 511 focuses on areas that house combustible dust, which is critical in environments like grain silos or wood processing facilities.

Combining both articles into one answer recognizes that both are essential in defining and creating safe electrical installations in their respective classified environments. Thus, understanding these articles is crucial for ensuring compliance with safety regulations in potentially hazardous locations.