Ignition Source in Class I, Division 1 Locations

Class I, Division 1 locations are those in which ignitible concentrations of _____ can exist under normal operating conditions.

a) combustible dust
b) easily ignitible fibers or flyings
c) flammable gases or flammable liquid produced vapors
d) pyrotechnics

See answer and applicable Code reference

The correct answer is: c) flammable gases or flammable liquid produced vapors

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