MSHA - Code of Federal Regulations - 30 CFR 75.906
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MSHA - Title 30 CFR
30 CFR § 75.906
Trailing cables for mobile equipment, ground wires, and ground check wires.


Trailing cables for mobile equipment shall contain one or more ground conductors having a cross-sectional area of not less than one-half the power conductor, and, on September 30, 1970, an insulated conductor for the ground continuity check circuit or other no less effective device approved by the Secretary or his authorized representative to assure such continuity, except that an extension of time, not in excess of 12 months may be permitted by the Secretary on a mine-by-mine basis if he determines that such equipment is not available. Splices made in the cables shall provide continuity of all components.