Terms of Underwriters Laboratories (UL) standards.
Safe products are rated UL Class I, Division 1 and Groups C and
D; Class II, Division 1 and Groups E, F and G; and temperature code
T3.
- Class – Class I includes environments of flammable gases,
vapors, or liquids. Class II includes combustible dust.
- Division 1 – This is the most stringent division of either
class. It covers situations where ignitable concentrations of
flammable gases, vapor, or liquids.
- (Class I) and combustible dust (Class II) can exist all of
the time or some of the time under normal operating
conditions.
- Groups – This specifies the type of flammable substance in
the hazardous environment. We are qualified in five groups: C
(ethylene), D (propane), E (metals), F (coal), and G
(grains).
- T3 – This is a temperature code and rates the equipment for
environments of less than
200 degrees C.
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