MSHA - Code of Federal Regulations - 30 CFR 57.4360
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MSHA - Title 30 CFR
30 CFR § 57.4360
Underground alarm systems.

(a) Fire alarm systems capable of promptly warning every person underground, except as provided in paragraph (b), shall be provided and maintained in operating condition.

(b) If persons are assigned to work areas beyond the warning capabilities of the system, provisions shall be made to alert them in a manner to provide for their safe evacuation in the event of a fire.