Open Neutral
Senior Member
- Location
- Inside the Beltway
- Occupation
- Engineer
I've not thought much about delta, wye and neutral since EE 443 w/Prof Klingshirn, or even longer ago, installing 3ph transformers and starters.
But I'm now looking at some plans from an electrician.
Q1) If you're fed with 480/277 wye, and run it 1000 ft to a 480 delta:208/120 wye stepdown transformer; are you required to carry a neutral along with those three legs?
(I've always thought it was "no"....)
Q2) What, if anything, changes when you add 480v 3ph motors upstream of the transformer?
But I'm now looking at some plans from an electrician.
Q1) If you're fed with 480/277 wye, and run it 1000 ft to a 480 delta:208/120 wye stepdown transformer; are you required to carry a neutral along with those three legs?
(I've always thought it was "no"....)
Q2) What, if anything, changes when you add 480v 3ph motors upstream of the transformer?