30 C.F.R. § 57.12050 Installation of trolley wires.
Title 30 - Mineral Resources
Trolley wires shall be installed at least seven feet above rails where height permits, and aligned and supported to suitably control sway and sag.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart K—Electricity
Surface and Underground
§ 57.12050 Installation of trolley wires.
