Section 183.370 - General grounding requirements(a) A vessel's hull must not carry current as a conductor except for the following systems: (1) Impressed current cathodic protection systems; or(2) Battery systems for engine starting.(b) Receptacle outlets and attachment plugs for portable lamps, tools, and similar apparatus operating at 100 volts or more, must have a grounding pole and a grounding conductor in the portable cord.(c) Each nonmetallic mast and top mast must have a lightning ground conductor.