MSHA - Code of Federal Regulations - 30 CFR 75.516
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MSHA - Title 30 CFR
30 CFR § 75.516
Power wires; support.


All power wires (except trailing cables on mobile equipment, specially designed cables conducting high-voltage power to underground rectifying equipment or transformers, or bare or insulated ground and return wires) shall be supported on well-insulated insulators and shall not contact combustible material, roof, or ribs.