MSHA - Code of Federal Regulations - 30 CFR 75.703-1
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MSHA - Title 30 CFR
30 CFR § 75.703-1
Approved method of grounding.

In instances where the metal frames both of an offtrack direct-current machine and of the metal frames of its component parts are grounded to the same grounding medium the requirements of §75.703 will be met.