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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 30 - Mineral Resources |
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Chapter I - Mine Safety and Health Administration, Department of Labor |
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SubChapter O - Coal Mine Safety and Health |
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Part 75 - Mandatory Safety Standards - Underground Coal Mines |
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Subpart H - Grounding |
§ 75.701-4 - Grounding wires; capacity of wires.
Latest version.
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§ 75.701-4 Grounding wires; capacity of wires.
Where grounding wires are used to ground metallic sheaths, armors, conduits, frames, casings, and other metallic enclosures, such grounding wires will be approved if:
(a) The cross-sectional area (size) of the grounding wire is at least one-half the cross-sectional area (size) of the power conductor where the power conductor used is No. 6 A.W.G., or larger.
(b) Where the power conductor used is less than No. 6 A.W.G., the cross-sectional area (size) of the grounding wire is equal to the cross-sectional area (size) of the power conductor.