Tom Trierweiler
Technical Education Committee Member
Malloy Electric Industrial Service Center 

Explosion proof (XP and EX) motors are an integral and required component in maintaining safety around hazardous locations containing flammable gases, vapors or combustible dust. Prevention of an internal spark, flame or explosion exiting the motor and contacting the ambient air is required to be certified by either the Underwriters Laboratory (UL), Mine Safety and Health Administration (MSHA) or Canadian Standards Association (CSA). A spark, flame or explosion in a hazardous location may lead to a larger explosion or a series of explosions. 

There are systems in place to limit external surface temperatures on motors for Class I, Group C or D and Class II, Group E, F or G. One of these systems is a thermal connected to the control circuit.

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