Which article of the NEC deals with classifications of hazardous materials?

• A. Article 500
• B. Article 480
• C. Article 510
• D. Article 520

Answer: (A)

Understanding how hazardous environments are treated in electrical design is essential for safety. The NEC sets up a system to classify areas where flammable gases, vapors, or dusts might be present, so equipment can be chosen and installed to prevent ignition. That framework lives in the article that covers Hazardous (classified) Locations. It defines the different hazard classes and divisions, explains where each applies, and lists the types of equipment and wiring methods that are permitted in those locations. This is the part of the Code that tells you how to identify a hazardous location and what protections are required. Choices that address other topics—such as storage batteries or industrial machinery—deal with different electrical subjects and do not address these classifications. Therefore, the article that governs hazardous classifications is the best answer.