Classified locations are defined under which article?

Classified locations are areas that have specific hazards due to the presence of flammable gases, vapors, liquids, dust, or fibers, and they are outlined in the National Electrical Code (NEC) to ensure that electrical installations are safe in these environments. Articles 510 and 511 specifically address different types of classified locations.

Article 510 pertains to hazardous (classified) locations for gaseous environments, focusing on areas where flammable gases or vapors could be present in concentrations that might ignite. This article covers various aspects of electrical installations in these environments to minimize risks associated with ignition.

Article 511, on the other hand, deals with hazardous (classified) locations related to flammable liquids. It provides regulations and guidelines for areas that may contain flammable liquids such as petroleum products, ensuring that electrical installations do not pose a risk of fire or explosion.

Recognizing that both Articles 510 and 511 define requirements for different types of classified locations demonstrates the comprehensive nature of the NEC in addressing safety across multiple hazardous environments. Therefore, the correct answer indicates that both articles are essential for understanding how classified locations are defined and regulated.