Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.808
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MSHA - Title 30 CFR
30 CFR § 75.808

Disconnecting devices.

[STATUTORY PROVISIONS]

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




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