What electrical classifications are typically used in ammonia facilities for hazardous locations?

What electrical classifications are typically used in ammonia facilities for hazardous locations?

• A. Class II hazardous locations with equipment rated for Division 1
• B. Non-hazardous
• C. Class I hazardous locations with equipment rated for Division 1 or 2
• D. Class III hazardous locations with Division 1

Answer: (C)

Ammonia is a gas, so hazardous-location classifications for these facilities are Class I, not Class II or III. The division rating (Division 1 or Division 2) indicates how often the hazardous atmosphere is present: Division 1 means the gas is present under normal operation, while Division 2 means it occurs only under abnormal conditions. In ammonia refrigeration, equipment is typically selected to be Class I, Division 1 or Division 2 to cover the possibility of ammonia gas being present. The other options misclassify the hazard type (dusts or fibers) or claim non-hazardous, which doesn’t fit ammonia systems.

Ammonia is a gas, so hazardous-location classifications for these facilities are Class I, not Class II or III. The division rating (Division 1 or Division 2) indicates how often the hazardous atmosphere is present: Division 1 means the gas is present under normal operation, while Division 2 means it occurs only under abnormal conditions. In ammonia refrigeration, equipment is typically selected to be Class I, Division 1 or Division 2 to cover the possibility of ammonia gas being present. The other options misclassify the hazard type (dusts or fibers) or claim non-hazardous, which doesn’t fit ammonia systems.