30 CFR § 57.22310
Electrical cables (I-C mines)
July 29, 2020
Electrical cables used to power submersible sump pumps shall be accepted or approved by MSHA as flame resistant, or be installed in continuous metal conduit or metal pipe. The ends of such conduit or pipe shall be sealed to prevent entry of explosive gas or dust.
[57 FR 61223, Dec. 23, 1992]