WAC 296-307-37825
What safety-related work practices relate
to flammable materials? Where flammable materials are present
only occasionally, electric equipment capable of igniting them
must not be used, unless measures are taken to prevent hazardous
conditions from developing.
Such materials include, but are not limited to: Flammable
gases, vapors, or liquids; combustible dust; and ignitable fibers
or flyings.
Note:
Electrical installation requirements for locations where flammable materials are present on a regular basis are contained in WAC 296-307-372.