30 CFR § 77.508 - Lightning arresters, ungrounded and exposed power conductors and telephone wires.

---
identifier: "/us/cfr/t30/s77.508"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.508 - Lightning arresters, ungrounded and exposed power conductors and telephone wires."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.508"
section_name: "Lightning arresters, ungrounded and exposed power conductors and telephone wires."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "77"
part_name: "MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811."
regulatory_source: "36 FR 9364, May 22, 1971, unless otherwise noted."
cfr_part: "77"
---


# 77.508 Lightning arresters, ungrounded and exposed power conductors and telephone wires.

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.