WAC 296-835-12040. Control ignition sources

(1) You 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) You 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 296-24-95613 . Electrostatic equipment has specific electrical requirements. See WAC 296-835-13010 . (3) You must prohibit smoking in any vapor area. Post an easily seen " NO SMOKING " sign near each dip tank.