MSHA - Code of Federal Regulations - 30 CFR 75.1003-1
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MSHA - Title 30 CFR
30 CFR § 75.1003-1
Other requirements for guarding of trolley wires and trolley feeder wires.

Adequate precaution shall be taken to insure that equipment being moved along haulageways will not come in contact with trolley wires or trolley feeder wires.