What does NEC require about equipment rating in hazardous locations?

What does NEC require about equipment rating in hazardous locations?

• A. Equipment installed in hazardous locations must be rated for the specific Class, Division, or Zone and suitable for the environment.
• B. Equipment need not be rated for hazardous locations.
• C. Equipment in hazardous locations only needs to be weatherproof.
• D. Equipment rating is determined by the color of the enclosure.

Answer: (A)

In hazardous locations, the NEC requires that equipment be properly rated for the specific hazard present and for the environment where it will be installed. This means equipment must be listed or approved for the exact Class, Division or Zone, and for the particular atmosphere (gas, vapor, dust) and conditions (temperature, gas group, humidity, etc.). That rating assures the device won’t ignite the surrounding atmosphere, and it dictates what kind of enclosure, insulation, or protective method is needed (explosion-proof, intrinsically safe, dust-ignition-proof, weatherproof as required, and so on). Color, or just making something weatherproof, does not substitute for the required rating. So the NEC mandate is that equipment in hazardous locations must be rated for the specific Class, Division or Zone and suitable for the environment.

In hazardous locations, the NEC requires that equipment be properly rated for the specific hazard present and for the environment where it will be installed. This means equipment must be listed or approved for the exact Class, Division or Zone, and for the particular atmosphere (gas, vapor, dust) and conditions (temperature, gas group, humidity, etc.). That rating assures the device won’t ignite the surrounding atmosphere, and it dictates what kind of enclosure, insulation, or protective method is needed (explosion-proof, intrinsically safe, dust-ignition-proof, weatherproof as required, and so on). Color, or just making something weatherproof, does not substitute for the required rating. So the NEC mandate is that equipment in hazardous locations must be rated for the specific Class, Division or Zone and suitable for the environment.