MSHA - Code of Federal Regulations - 30 CFR 57.22310
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MSHA - Title 30 CFR
30 CFR § 57.22310
Electrical cables (I-C mines).

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]