- a) Electrical equipment and wiring for use in ammonia installations shall be general purpose or weather resistant as appropriate.
- b) Where concentrations of ammonia in air in excess of 16% by volume are likely to be encountered, electrical equipment and wiring shall be installed to comply with the requirements specified for use in hazardous locations, Class I, Group D, of ANSI/NFPA 70, National Electrical Code, Articles 500 and 501.
(Source: Amended at 27 Ill. Reg. 9922, effective July 1, 2003)