WAC 296-826-40005. Electrical

(1) You must use electrical equipment and wiring on ammonia installations that is either of the following: (a) General purpose; or (b) Weather resistant. (2) You must follow the electrical requirements found in another chapter, chapter 296-24 WAC, Part L for Class 1, Group D locations when the concentrations of ammonia in air are in excess of 16% by volume.