MSHA - Code of Federal Regulations - 30 CFR 75.1103-1
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MSHA - Title 30 CFR
30 CFR § 75.1103-1
Automatic fire sensors.

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.