---
kind: "section"
citation: "46 C.F.R. § 129.370"
title: "46"
number: "129.370"
heading: "Equipment grounding."
url: "https://uscodex.org/cfr/46/129.370"
---

# §129.370. Equipment grounding.

- (a) On a metallic vessel each metallic enclosure and frame of electrical equipment must be permanently grounded to the hull. On a nonmetallic vessel each enclosure and frame of electrical equipment must be bonded to each other and to a common ground by a conductor not normally carrying current.
- (b) Each metallic case of instruments must be grounded. So must each secondary winding of instrument transformers.
- (c) Each equipment grounding conductor must be sized to comply with [section 250-95](/cfr/46/250-95.md) of NEC (NFPA 70).
- (d) Each nonmetallic mast and topmast must have a lightning-ground conductor.

## Notes

### Authority

Authority: 46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 82-004 and CGD 86-074, 62 FR 49332, Sept. 19, 1997, unless otherwise noted.