UL Standard for Safety Electric Motors and Generators for Use in Division 1 Hazardous (Classified) Locations Fourth Edition; Reprint with Revision Through and Including October 19, 2007
1.1 These requirements cover the following equipment for installation and use in hazardous (classified)
locations, Class I, Division 1, Groups B, C, and D, and Class II, Division 1, Groups E, F, and G, in
accordance with the National Electrical Code, NFPA 70:
a) Electric motors and generators; and
b) Submersible and nonsubmersible sewage pumps and systems.
1.2 These requirements also cover the same types of electrical equipment indicated in 1.1 for installation
and use in Class I, Zone 1, Groups IIA, IIB, and IIB plus hydrogen and Zone 20 and 21 hazardous
(classified) locations in accordance with the National Electrical Code, NFPA 70.
1.2 revised August 12, 2008
1.3 These requirements cover both horizontal and vertical machines that have fractional and integral
horsepower ratings and are for use on alternating current (ac) or direct current (dc).
1.4 These requirements cover electric motors and generators for use only under the following
atmospheric conditions:
a) A minimum ambient temperature of minus 70°C (minus 94°F);
b) An oxygen concentration not greater than 21 percent by volume; and
c) A nominal barometric pressure of one atmosphere.
1.5 These requirements do not cover intrinsically safe motors and generators.