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MSHA - Title 30 CFR
30 CFR § 77.807-3
Movement of equipment; minimum distance from high-voltage lines.
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.