C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH › PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES › Subpart J—Travelways and Escapeways

30 C.F.R. § 57.11054

Communication with refuge chambers

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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.