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Document UL 1203 is offered by IHS as part of an online subscription. This subscription contains many documents on the same topic.
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UL 1203 Document Information:
Title
UL Standard for Safety Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations
Underwriters Laboratories Inc.
Publication Date:
Sep 15, 2006
Scope:
These requirements cover explosion-proof and dust-ignition-proof
electrical equipment for installation and use in hazardous
(classified) locations, Class I, Division 1, Groups A, B, C, and D,
and Class II, Division 1, Groups E, F, and G, in accordance with
the National Electrical Code, NFPA 70.
These requirements also cover explosion-proof electrical
equipment for installation and use in Class I, Zone 1, Groups IIA,
IIB, and IIC hazardous (classified) locations and
dust-ignition-proof equipment for use in Zone 20, 21, and 22
locations.
These requirements also cover explosion-proof electrical
equipment that has been investigated for use in one or more
specific gas or vapor atmospheres with or without additional Class
I Groups. See 60.6.
These requirements do not cover equipment for use in hazardous
(classified) locations specifically covered in a separate
standard.
These requirements do not cover electrostatic devices, circuits
or systems; refrigeration system controllers or the internal
construction of electrical instruments such as meters.
These requirements cover equipment for use under the following
atmospheric conditions:
a) A minimum ambient temperature of minus 50°C (minus 58°F);
b) An oxygen concentration not greater than 21 percent by
volume; and
c) A nominal barometric pressure of one atmosphere.
Equipment covered by this standard shall also comply with the
applicable requirements for similar equipment for use in ordinary
unclassified locations.
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