30 C.F.R. § 77.508-1 Lightning arresters; wires entering buildings.
Title 30 - Mineral Resources
Lightning arresters protecting exposed telephone wires entering buildings shall be provided at the point where each such telephone wire enters the building.
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
§ 77.508-1 Lightning arresters; wires entering buildings.
