30 C.F.R. § 75.800-1 Circuit breakers; location.
Title 30 - Mineral Resources
Circuit breakers protecting high-voltage circuits entering an underground area of any coal mine shall be located on the surface and in no case installed either underground or within a drift.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart I—Underground High-Voltage Distribution
§ 75.800-1 Circuit breakers; location.
