CFR > Title 46 - Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER K—SMALL PASSENGER VESSELS CARRYING MORE THAN 150 PASSENGERS OR WITH OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS (parts 114 to 123) > PART 120—ELECTRICAL INSTALLATION > SUBPART C—Power Sources and Distribution Systems (§120.310 to §120.392) > 120.372—Equipment and conductor grounding.

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 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.