Remotely Operated Vehicle (ROV) for underwater has been the partner in the offshore oil rig, underwater communication cable installations, and other major underwater constructions for safety installations and maintenance. ROV uses different sizes, from an observation class weighing less than 10kg to a work class ROV weighing 1 to a hundred tons in weight. Electrical power requirements of ROV increase from less than 1kw to a thousand kilowatts of power in relation to its class. The risks involved in electrical safety also increase without proper training in electrical safety awareness.