I know this may seem like a stupid question, but I seem to be having some problem finding the answer to this one.
We have a 3 phase, 4 wire, 480/277 volt system. The service entrance conductors from the transformer to the service entrance disconnect consist of 3 parallel sets of 3 - #350 phase conductors and 1 - #350 neutral conductor in PVC Sch. 80 conduit. I understand that at the service entrance disconnect, the neutral conductor must be bonded to the enclosure and a grounding electrode.
My questions is this: Is there supposed to be a ground conductor included with the service entrance cables from the transformer to the disconnect such that they consist of the following: 3 sets of 3 - #350 phase conductors, 1 - #350 neutral conductor, and 1 - #1/0 ground conductor.
We have a 3 phase, 4 wire, 480/277 volt system. The service entrance conductors from the transformer to the service entrance disconnect consist of 3 parallel sets of 3 - #350 phase conductors and 1 - #350 neutral conductor in PVC Sch. 80 conduit. I understand that at the service entrance disconnect, the neutral conductor must be bonded to the enclosure and a grounding electrode.
My questions is this: Is there supposed to be a ground conductor included with the service entrance cables from the transformer to the disconnect such that they consist of the following: 3 sets of 3 - #350 phase conductors, 1 - #350 neutral conductor, and 1 - #1/0 ground conductor.