MSHA - Code of Federal Regulations - 30 CFR 57.12006
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MSHA - Title 30 CFR
30 CFR § 57.12006
Distribution boxes.


Distribution boxes shall be provided with a disconnecting device for each branch circuit. Such disconnecting devices shall be equipped or designed in such a manner that it can be determined by visual observation when such a device is open and that the circuit is deenergized, and the distribution box shall be labeled to show which circuit each device controls.


For more information: See MSHA'S Program Policy Manual