An individual apartment in a multi-family dwelling is supplied by 255 amp THW copper feeders. The feeder conductors are protected by 225 amp breakers from the main 800 amp building service. The water piping systems in the apartment is metal but tap is pvc. What size equipment bonding jumper is needed ?

An individual apartment in a multi-family dwelling is supplied by 255 amp THW copper feeders. The feeder conductors are protected by 225 amp breakers from the main 800 amp building service. The water piping systems in the apartment is metal but tap is pvc. What size equipment bonding jumper is needed ?