The electrical components of each fire suppression device used on permissible equipment inby the last open crosscut or on equipment in the return airways of any coal mine shall be permissible or intrinsically safe and such components shall be maintained in permissible or intrinsically safe condition.
[37 FR 15302, July 29, 1972]
source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.
cite as: 30 CFR 75.1107-5