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.