Forget the romex the bx and conduit .
Everything on a vessel must be flexible and able to take harsh punishment as you can see in the picture at left of a piece of marine cable which has an extra tough rubber style jacket with either an aluminum, brass or Stainless steel mesh outer jacket.
Even Fire alarm wiring which is low voltage must utilize this type of wiring as you can see in the middle picture .
Because a vessel is always vibrating and flexing as it sits in the water the wiring and components must be able to adapt to this environment.
One of the most dangerous aspects of being on a working vessel is fire especially in the engine room thats why many vessels utilize some type of fire suppression agent which can trip manually or automatically as you can see this boat has in bottom picture which is several CO2 cylinders which can be activated to snuff out an engine fire.
Not only do you have a diesel engines which propel the boat but also a diesel generator which provides power for lighting navigation and cooking .
All of these systems and rules governing there installation and servicing follow under United States Coast Guard USGC rules for commercial vessels.
Personnel pleasure craft do not follow these rules but they must be followed if a craft is used for hire. Especially any craft carrying passengers or employees.
Even thou the tow boats I work on which push rows of barges with all kinds of commodities from oil to coal , scrap steel to sand etc. are operated on an Inland rivers they must follow USCG rules. and pass Inspections by a USCG officer.
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