MSHA - Code of Federal Regulations - 30 CFR 77.808
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MSHA - Title 30 CFR
30 CFR § 77.808
Disconnecting devices.

Disconnecting devices shall be installed at the beginning of each branch line in high-voltage circuits and they shall be equipped or designed in such a manner that it can be determined by visual observation that the circuit is deenergized when such devices are open.