Which sub-articles provide details for specific hazards within hazardous locations?

• A. 501-502
• B. 502-503
• C. 503-504
• D. 504-505

Answer: (A)

Hazardous locations are organized by the type of hazard, with separate articles for each class. The detailed provisions for specific hazards inside those locations are found in the articles that cover Class I and Class II locations, where gas/vapor hazards and dust hazards are defined and the related installation requirements are spelled out. That’s why the range that includes both of these primary hazardous classes—501 and 502—provides the details for those specific hazards within hazardous locations. The other pairings don’t group these primary hazard classes together in the same way, so they don’t serve as the correct source for these details.