30 C.F.R. § 75.1600-1 Communication facilities; main portals; installation requirements.
Title 30 - Mineral Resources
A telephone or equivalent two-way communication facility shall be located on the surface within 500 feet of all main portals, and shall be installed either in a building or in a box-like structure designed to protect the facilities from damage by inclement weather. At least one of these communication facilities shall be at a location where a responsible person who is always on duty when men are underground can hear the facility and respond immediately in the event of an emergency. [38 FR 29999, Oct. 31, 1973]
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart Q—Communications
§ 75.1600-1 Communication facilities; main portals; installation requirements.
