StacksVerified U.S. regulatory reference

30 CFR §75.703-2

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
For purposes of grounding offtrack direct-current machines, the following grounding mediums are approved:
  1. (a)The grounded polarity of the direct-current power system feeding such machines; or,
  2. (b)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.