- (a) If a grounded distribution system is provided, there must be only one connection to ground, regardless of the number of power sources. This connection must be at the main switchboard.
- (b) On each metallic vessel, a grounded distribution system must be grounded to the hull. On each nonmetallic vessel, the neutral of a grounded system must be connected to a common ground plate, except that no aluminum grounding conductors may be used.
(c) On each nonmetallic vessel with a grounded distribution system, the common ground plate must have—
- (1) Only one connection to the main switchboard; and
- (2) The connection to itself readily accessible for checking.
- (d) On each nonmetallic vessel with a ground plate provided for radio equipment, the plate must be connected to the common ground plate.
(e) Each insulated grounding-conductor of a cable must be identified by one of the following means:
- (1) Wrapping of the cable with green braid or green insulation.
- (2) Stripping of the insulation from the entire exposed length of the grounding-conductor.
- (3) Marking of the exposed insulation of the grounding-conductor with green tape or green adhesive labels.
(f) No vessel's hull may carry current as a conductor except for—
- (1) An impressed-current cathodic-protection system; or
- (2) A battery system to start an engine.
- (g) No cable armor may be used to ground electrical equipment or systems.
- (h) Each receptacle outlet and attachment plug, for a portable lamp, tool, or similar apparatus operating at 100 or more volts, must have a grounding-pole and a grounding-conductor in the portable cord.