This recommended practice covers the requirements for all marine inboard engine wiring assemblies and components. The purpose of this recommended practice is to insure that wiring used on marine engines meets the necessary safety standards of the industry. The recommendations cover methods that may be employed by manufacturers to minimize the possibility that engine wiring may be a source of ignition of explosive or flammable vapors and provide manufacturers installing engine electrical systems sufficient information to design and develop engine wiring harnesses safe for marine usage.