['Specialized Industries']

['Mining']

07/19/2025

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§57.12069 Lightning protection for telephone wires and ungrounded conductors.

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§57.12069 Lightning protection for telephone wires and ungrounded conductors.

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

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.

['Specialized Industries']

['Mining']

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