30 CFR Part 57Public Domain
§ 57.12053 — Circuits powered from trolley wires
Subpart K — Electricity
Ground wires for lighting circuits powered from trolley wires shall be connected securely to the ground return circuit.
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.