Scott 35,
I've looked at an installation, but do not have the prints, where it appears the premise is supplied by a 34.5KV to 4160V 3Ø 3W secondary load transformer and the 4160v is underground feeders to various remote loads on the premise.
At one location, a 150KVA 4160Y / 480Y transformer is installed on one of the feeders.
The Ho terminal is Bonded to the transformer case and to a ground rod within the pad mount slab opening. The 3 - 1/C - 4/0 Aluminum cable shields are also connected to the this Ho bonding (GEC?) to the ground rod.
The bonding jumper continues into the 480Y side of the pad mount transformer and is again connected to the case and to the Xo bushing with a factory bond to the Case.
Except for the HV cable shield(s), the ground rod bonding does not leave that transformer location.
There is not a Xo conductor with the 480V feeders into the building.
My question is:
If this is a 3Ø 3W delta system at the Service Point, can it be made a 4W system by grounding an Ho terminal on a transformer some 2000' feet away from the service point?
[This message has been edited by Gwz (edited 01-14-2003).]
