MSHA - Code of Federal Regulations - 30 CFR 75.515
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MSHA - Title 30 CFR
30 CFR § 75.515
Cable fittings; suitability.


Cables shall enter metal frames of motors, splice boxes, and electric compartments only through proper fittings. When insulated wires other than cables pass through metal frames, the holes shall be substantially bushed with insulated bushings.