Statutes, codes, and regulations
Code of Federal Regulations
Title 30 - MINERAL RESOURCESChapter I - MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABORSubchapter K - METAL AND NONMETAL MINE SAFETY AND HEALTHPart 57 - SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINESSubpart K - ELECTRICITY
SURFACE ONLY
Section 57.12069 - Lightning protection for telephone wires and ungrounded conductors

30 C.F.R. § 57.12069

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Current through November 30, 2024
Section 57.12069 - Lightning protection for telephone wires and ungrounded conductors

Each ungrounded conductor or telephone wire that leads underground and is directly exposed to lightning shall be equipped with suitable lightning arrestors of approved type within 100 feet of the point where the circuit enters the mine. Lightning arrestors shall be connected to a low resistance grounding medium on the surface and shall be separated from neutral grounds by a distance of not less than 25 feet.

30 C.F.R. §57.12069