30 C.F.R. § 77.508 Lightning arresters, ungrounded and exposed power conductors and telephone wires.
Title 30 - Mineral Resources
All ungrounded, exposed power conductors and telephone wires shall be equipped with suitable lightning arresters which are adequately installed and connected to a low resistance grounding medium.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart F—Electrical Equipment—General
§ 77.508 Lightning arresters, ungrounded and exposed power conductors and telephone wires.
