MSHA - Code of Federal Regulations - 30 CFR 77.505
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MSHA - Title 30 CFR
30 CFR § 77.505
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.