MSHA - Code of Federal Regulations - 30 CFR 57.12084
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MSHA - Title 30 CFR
30 CFR § 57.12084
Branch circuit disconnecting devices.

Disconnecting switches that can be opened safely under load shall be provided underground at all branch circuits extending from primary power circuits near shafts, adits, levels and boreholes.

For more information: See MSHA'S Program Policy Manual