30 CFR 75.521
§ 75.521 Lightning arresters; ungrounded and exposed power conductors and telephone wires.
United States · 30 CFR — Mineral Resources · Status: effective
Cite this
- Citation
- 30 CFR 75.521, § 75.521 Lightning arresters; ungrounded and exposed power conductors and telephone wires, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/133589
- Permanent ID
ys:prov:133589@1- SHA-256
2d49526a1905c969da536feaa678c22ac68786015b6cb363f65b5da4c9d3adef
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Full text
Each ungrounded, exposed power conductor and each ungrounded, exposed telephone wire that leads underground shall be equipped with suitable lightning arresters of approved type within 100 feet of the point where the circuit enters the mine. Lightning arresters shall be connected to a low resistance grounding medium on the surface which shall be separated from neutral grounds by a distance of not less than 25 feet.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.