30 C.F.R. § 57.11054 Communication with refuge chambers.
Title 30 - Mineral Resources
Telephone or other voice communication shall be provided between the surface and refuge chambers and such systems shall be independent of the mine power supply.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart J—Travelways and Escapeways
Escapeways—Underground Only
§ 57.11054 Communication with refuge chambers.
