Choose the Right Electric Motors for Hazardous Locations

Originally published in Chemical Engineering Progress (CEP), this article by Zeton's Uriah van Amerom explains how to select electric motors for environments containing combustible gases, dusts, or fibers.

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Electric motors can ignite an explosion through arcs, sparks, or hot surfaces, so matching a motor to its environment is a real safety requirement, not a formality. The paper walks through the North American classification system (NEC/CEC), organized by material type (Class I gases, Class II dusts, Class III fibers) and by operating condition (Division 1 for normal operation, Division 2 for abnormal/fault conditions), and explains how autoignition temperature (AIT) ratings map to motor temperature codes (T-codes).

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It contrasts explosion-proof motor requirements for Class I Division 1 areas against the lighter requirements for Division 2, covers dust-ignition-proof motors for Class II environments, touches on the IEC's alternative classification approach, and flags the extra heat generated by VFD inverter-duty motors as its own hazardous-area consideration.