30 C.F.R. § 57.4160 Underground electric substations and liquid storage facilities.
Title 30 - Mineral Resources
The requirements of this standard apply to underground areas only. (a) Areas within 25 feet of the following shall be free of combustible materials: (1) Electric substations. (2) Unburied, combustible liquid storage tanks. (3) Any group of containers used for storage of more than 60 gallons of combustible liquids. (b) This standard does not apply to installed wiring or timber that is coated with at least one inch of shotcrete, one-half inch of gunite, or other noncombustible materials with equivalent fire protection characteristics.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart C—Fire Prevention and Control
Prohibitions/Precautions/Housekeeping
§ 57.4160 Underground electric substations and liquid storage facilities.
