MSHA - Code of Federal Regulations - 30 CFR 75.706
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MSHA - Title 30 CFR
30 CFR § 75.706
Deenergized underground power circuits; idle days idle shifts.


When not in use, power circuits underground shall be deenergized on idle days and idle shifts, except that rectifiers and transformers may remain energized.

Subpart I--Underground High-Voltage Distribution