I have a new manufactuing facility being supplied with a 1200a 480/277v 3ph service from a new utility owned pad mount transformer. The service has 4 paralleled raceways each containing 5 conductors, three ungrounded conductor, one grounded conductor, and one grounding electrode conductor. The grounding electrode conductor travels in the same raceway to the transformer vault and passes through the vault and connects to a ground ring. The utility company also used the same ground ring to ground its transformer. At the service point in our new MDP the four GEC are bonded to the neutral bus along with a bonding jumper connected to the MDP enclosure. Building steel and water are also bonded here. My question is is it permissable to run the GEC in the same raceway as the service entrance conductors and ground them to the same point as the utilities transformer or does this cause a paralleled connection between the grounded conductor and the grounding electrode conductor since they are effectively connected together at each end ( at the ground ring of the transformer and at the service neutral bar) or should the GEC have been ran in its own raceway to the ground ring? Thanks.
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