Mine Safety and Health Administration (MSHA) - Code of Federal Regulations - 30 CFR 75.704
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MSHA - Title 30 CFR
30 CFR § 75.704

Grounding frames of stationary high voltage equipment receiving power from ungrounded delta systems.

[STATUTORY PROVISIONS]

The frames of all stationary high-voltage equipment receiving power from ungrounded delta systems shall be grounded by methods approved by an authorized representative of the Secretary.




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