I have a requirement to provide an isolated ground. The customer has asked for the Isolated ground wire to originate at the secondary side of the transformer, XO, and be brought into the panel and landed on an isolated ground bar. I have an existing 1200 amp 120/208 three phase service, exterior meter pack system. The utility transformer is about thirty feet away and comes right into two 600 amp disconnects. The service is grounded/bonded to the water and ground rods per NEC. From this point on the neutral is floating to individual retail locations. I have pulled into the same conduit an isolated ground wire and landed it on an isolated ground bar. Even though it may be isolated it is still electrically the same wire because it is terminated at the same point as the equipment ground.
Is this not a permissible installation of an isolated ground?
The equipment being served is a 30kVA UPS and Telephone Switching gear.
