Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.509
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MSHA - Title 30 CFR
30 CFR § 75.509

Electric power circuit and electric equipment; deenergization.

[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.




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