30 C.F.R. § 57.12027 Grounding mobile equipment.
Title 30 - Mineral Resources
Frame grounding or equivalent protection shall be provided for mobile equipment powered through trailing cables.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart K—Electricity
Surface and Underground
§ 57.12027 Grounding mobile equipment.

