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U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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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 |