MSHA - Code of Federal Regulations - 30 CFR 75.518-1
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MSHA - Title 30 CFR
30 CFR § 75.518-1
Electric equipment and circuits; overload and short circuit protection; minimum requirements.

A device to provide either short circuit protection or protection against overload which does not conform to the provisions of the National Electric Code, 1968, does not meet the requirement of §75.518. In addition, such devices on electric face equipment and trailing cables that are required to be permissible must meet the requirements of the applicable schedules of the Bureau of Mines.