Wye-Wye bank grounding question
Wye-Wye bank grounding question
(OP)
I am receiving some conflicting information on a Wye-Wye transformer connection. Concerning a three transformer bank connected wye on the secondary side, should the neutral wire that connects all three transformers be grounded to the transformer tank lug of just the center transformer or should the neutral wire be grounded to the grounding lug of each transformer?






RE: Wye-Wye bank grounding question
Bill
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"Why not the best?"
Jimmy Carter
RE: Wye-Wye bank grounding question
RE: Wye-Wye bank grounding question
RE: Wye-Wye bank grounding question
RE: Wye-Wye bank grounding question
Once past the neutral jumper the neutral current is usually much less and the size of the neutral service conductor may be reduced.
However the jumper between the transformers carries the same current as the hot leads and should be the same size as the phase conductors.
I have seen a lot of instances where someone assumed that because the jumper was a neutral it could be reduced in ampacity. Not so.
If the neutral jumper was undersized than I would expect both the jumper and the #6 AWG grounding conductor to get hot.
Bill
--------------------
"Why not the best?"
Jimmy Carter