§75.703-2. Approved grounding mediums.
30 C.F.R. § 75.703-2
For purposes of grounding offtrack direct-current machines, the following grounding mediums are approved:
The grounded polarity of the direct-current power system feeding such machines; or,
The alternating current grounding medium where such machines are fed by an ungrounded direct-current power system originating in a portable rectifier receiving its power from a section power center. However, when such a medium is used, a separate grounding conductor must be employed.
Notes, amendments, and revision history
Authority
Authority: 30 U.S.C. 811, 813(h), 957.
Source
Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.