This entry covers the electromagnetic compatibility requirement that the Japanese manufacturer Yamaha applies to the electrical and electronic components of its motorcycles and other powered products, and the vehicle class gives the requirement a character of its own. A motorcycle presents an electrical environment that differs from that of a car: the installation is small and closely packed, so components and their harnesses sit next to the ignition system and the alternator; the electrical system has limited generating capacity and the loads are switched abruptly; and there is very little metal to provide a reference plane or any shielding, so the same component may behave quite differently on a motorcycle and on a car. The requirement is issued to the component supplier with the engineering specification, and the tests are performed at a facility accepted by the manufacturer.