30 CFR § 77.807-3
Movement of equipment; minimum distance from high-voltage lines
July 29, 2020
When any part of any equipment operated on the surface of any coal mine is required to pass under or by any energized high-voltage powerline and the clearance between such equipment and powerline is less than that specified in §77.807-2 for booms and masts, such powerlines shall be deenergized or other precautions shall be taken.