a multifamily building has two (1200) amp services,one service on each in of the building. each service has two ground rods (6)ft apart as the only electode to ground the services, there is no firewall to separate the building. the service entrance conductor from the power compamy to connect to the supply side of the service will be (600)kcmil. my question is what size conductor is require to bond the ground rod electrodes together to comply with section 250.58 ? there is no building steel or metal water pipe to bond to, thanks,mj
