Section R. 281.3111 - Electrical equipmentRule 111.
(1) Permanently installed electrical appliances, equipment, and fixtures used on a vessel shall be designed so that the current-carrying parts of the device are effectively insulated from exposed metal parts by an electrical insulating material suitable for use in damp or wet locations.(2) All permanently installed electrical appliances, equipment, and fixtures shall be properly connected to the vessel's electrical grounding system.(3) All electrical appliances, equipment, and fixtures installed or used in machinery spaces or other areas where flammable vapors may be present shall be designed, enclosed, or protected to prevent ignition of flammable vapors.(4) Switches, circuit breakers, and fuse boxes or blocks used on a vessel shall be approved by underwriters laboratories for marine use, where available, or shall be a type commonly manufactured for use on vessels. These devices shall have suitable protection to prevent accidental shorting.Mich. Admin. Code R. 281.3111