Definitions:
Class I locations. Areas where flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.
Class II locations. Areas where the presence of combustible dust could be sufficient to produce explosions.
Class III locations. Areas where the presence of easily ignitable fibers are suspended in the air but are not in large enough quantities to produce ignitable mixtures.
Exemption: The container shutoff valve may be left open if it is necessary to run the engine.
Wash. Admin. Code § 296-863-30015
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 04-19-051, § 296-863-30015, filed 9/14/04, effective 2/1/05.