---
kind: "section"
citation: "46 C.F.R. § 120.372"
title: "46"
number: "120.372"
heading: "Equipment and conductor grounding."
url: "https://uscodex.org/cfr/46/120.372"
---

# §120.372. Equipment and conductor grounding.

- (a) All metallic enclosures and frames of electrical equipment must be permanently grounded to the hull on a metallic vessel. On a nonmetallic vessel, the enclosures and frames of electrical equipment must be bonded together to a common ground by a normally non-current carrying conductor. Metallic cases of instruments and secondary windings of instrument transformers must be grounded.
- (b) On a nonmetallic vessel, where a ground plate is provided for radio equipment, it must be connected to the common ground.
- (c) Equipment grounding conductors must be sized in accordance with [Section 250-95](/cfr/46/250-95.md) of the NEC (NFPA 70), or other standard specified by the Commandant.
- (d) Each insulated grounding conductor of a cable must be identified by one of the following means.
  - (1) A green braid or green insulation;
  - (2) Stripping the insulation from the entire exposed length of the grounding conductor; or
  - (3) **Marking the exposed insulation of the grounding conductor with green tape or green adhesive labels.**
- (e) Cable armor must not be used to ground electrical equipment of systems.

## Notes

### Authority

Authority: 46 U.S.C. 2103, 3306; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 85-080, 61 FR 928, Jan. 10, 1996, unless otherwise noted.