30 C.F.R. § 57.12053 Circuits powered from trolley wires.
Title 30 - Mineral Resources
Ground wires for lighting circuits powered from trolley wires shall be connected securely to the ground return circuit.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart K—Electricity
Surface and Underground
§ 57.12053 Circuits powered from trolley wires.
