Code of Federal Regulations · Section
§ 75.706 — Deenergized Underground Power Circuits; Idle Days—Idle Shifts
30 C.F.R. § 75.706
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When not in use, power circuits underground shall be deenergized on idle days and idle shifts, except that rectifiers and transformers may remain energized.
Authorizing Statute
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Mandatory safety and health standards30 U.S.C. § 811