480V Delta Primary Transformer

[cwalkercomo]

For transformers that are 480V Delta to 120/208V Wye such as Square D's EXN75T3H, even though the original primary service is 480/277 Wye, do you simple take the 3 hots to the transformer and ignore the neutral? Is that how it turns ends up being 480V delta at the transformer? Or is the delta irrelevant at that point?

 

[infinity]

Delta is the configuration of the three primary windings and in the case of the 480-208Y/120 transformer there is only three connection points on the delta primary so even if you brought a neutral to the transformer there would be no place on the primary to connect it.

 

[cwalkercomo]

Delta is the configuration of the three primary windings and in the case of the 480-208Y/120 transformer there is only three connection points on the delta primary so even if you brought a neutral to the transformer there would be no place on the primary to connect it.

That's what I was thinking originally, have had a few guys bring that up on the primary side but never knew quite how to answer it. I just knew to get the voltages correct on both sides and ask if it's delta or wye on the secondary.