MSHA - Code of Federal Regulations - 30 CFR 57.12071
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MSHA - Title 30 CFR
30 CFR § 57.12071
Movement or operation of equipment near high-voltage powerlines.


When equipment must be moved or operated near energized high-voltage powerlines (other than trolley lines) and the clearance is less than 10 feet, the lines shall be deenergized or other precautionary measures shall be taken.