46 CFR § 183.210 - Protection from wet and corrosive environments.
(a) Electrical equipment used in the following locations must be dripproof:
(1) A machinery space;
(2) A location normally exposed to splashing, water washdown, or other wet conditions within a galley, a laundry, or a public washroom or toilet room that has a bath or shower; or
(3) Another space with a similar moisture level.
(b) Electrical equipment exposed to the weather must be watertight.
(c) Electrical equipment exposed to corrosive environments must be of suitable construction and corrosion-resistant.