MSHA - Code of Federal Regulations - 30 CFR 75.703-4
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MSHA - Title 30 CFR
30 CFR § 75.703-4
Other methods of protecting offtrack direct-current equipment; approved by an authorized representative of the Secretary.

Other methods of maintaining safe voltage by preventing a difference between the frames of offtract direct-current machines and the earth must be approved by an authorized representative of the Secretary.