30 CFR Part 57Public Domain
§ 57.4160 — Underground electric substations and liquid storage facilities
Subpart C — Fire Prevention and Control
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.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.