WAC 296-307-45540. Control ignition sources

(1) The employer must make sure the vapor areas and adjacent areas do not have any: (a) Open flames; (b) Spark producing devices; (c) Heated surfaces hot enough to ignite vapors. (2) The employer must use explosion-proof wiring and equipment in the vapor area. Reference: Electrical wiring and equipment has to meet the requirements of the applicable hazardous (classified) location. See Hazardous (classified) locations, WAC 296-307-37209 . (3) The employer must prohibit smoking in any vapor area: Post an easily seen " NO SMOKING " sign near each dip tank.