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35 FR 17890, Nov. 20, 1970, unless otherwise noted.
67 FR 11001, Mar. 11, 2002, unless otherwise noted.
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The provisions of this part marked [Statutory Provision] appear in Title III of the Federal Coal Mine Health and Safety Act of 1969.
[Statutory Provisions]
The grounding resistor, where required, shall be of the proper ohmic value to limit the voltage drop in the grounding circuit external to the resistor to not more than 100 volts under fault conditions. The grounding resistor shall be rated for maximum fault current continuously and insulated from ground for a voltage equal to the phase-to-phase voltage of the system.