Residual Current Devices

[drewlas]

These may go by other names in other places but I am referring to the electrical safety device (mandatory in Australian homes now) that trips a breaker whenever current is lost to ground; such as when someone is being eletrocuted.
My question is, would they work on a ship on the ocean?
Anybody??
Thanks in advance.

[Azzan]

Residual current operated circuit-breakers are amperometric protection devices which trip when the system leaks a significant current to earth. A residual current device (RCD), similar to a residual current circuit breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the electric current is not balanced between the energized conductor and the return neutral conductor.