---
kind: "section"
citation: "30 C.F.R. § 75.703-2"
title: "30"
number: "75.703-2"
heading: "Approved grounding mediums."
url: "https://uscodex.org/cfr/30/75.703-2"
---

# §75.703-2. Approved grounding mediums.


For purposes of grounding offtrack direct-current machines, the following grounding mediums are approved:

- (a) The grounded polarity of the direct-current power system feeding such machines; or,
- (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.

## Notes

### Authority

Authority: 30 U.S.C. 811, 813(h), 957.

### Source

Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.