30 CFR 75.509 : Mineral Resources (§ 1.1 To Parts 1291-1299) — (§ 1.1 To Parts 105-199) — Mine Safety And Health Administration, Department Of Labor (§ 1.1 To Parts 105-199) — Coal Mine Safety And Health (§ 70.1 To § 90.301) — Mandatory Safety Standards - Underground Coal Mines (§ 75.1 To § 75.1916) — Electrical Equipment - General (§ 75.500 To Appendix A To Subpart F Of Part 75) — Electric power circuit and electric equipment; deenergization.
4 Aug 2016
[Statutory Provisions]
All power circuits and electric equipment shall be deenergized before work is done on such circuits and equipment, except when necessary for trouble shooting or testing.