Inspection and tests of explosion proof motors

Standards for inspection and test of electrical equipment for use in hazardous locations have been developed by the Underwriters' Laboratories. As the result of extensive research, considerable information has been made available on the explosion proof characteristics of motors and other electrical equipment in locations where there are highly flammable gases, volatile liquids, or other substances. Particular attention is given in this paper to explosion proof motors when subjected to that group of gases or vapors which have the lowest explosion hazard.