A fire sensor system shall be installed on each underground belt conveyor. Sensors so installed shall be of a type which will (a) give warning automatically when a fire occurs on or near such belt; (b) provide both audible and visual signals that permit rapid location of the fire.
source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.
cite as: 30 CFR 75.1103-1