30 CFR 57.12069 - Lightning protection for telephone wires and ungrounded conductors.

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§ 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.

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United States Code

Title 30 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 30 CFR Part 57 after this date.

  • 2015-09-02; vol. 80 # 170 - Wednesday, September 2, 2015
    1. 80 FR 52984 - MSHA Headquarters, Pittsburgh Safety and Health Technology Center, and Respirable Dust Processing Laboratory Address Changes
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Mine Safety and Health Administration
      Final rule; technical amendment.
      Effective Date: September 2, 2015.
      30 CFR Parts 7, 18, 44, 46, 48, 49, 56, 57, 70, 71, 72, 74, 75, and 90