Hello,
I am new to this forum and would like some help with wire sizing for a Delta Wye transformer. My situation is as follows:
Incoming to the transformer is a three wire (three phase) 480V supply. The secondary is 120v, but is broken down into three separate 83amp circuits. The total secondary amp draw is 198.
Do I size the four wires going to the control panel for the entire 198 amps or can I size each line at the 83 amps (plus 125% and whatever fuse size there is for each leg). There is only one nuetral (X0) and three hot wires (X1,X2,X3). I am thinking I need to run these wires as 3/0, but would like another opinion to see if they could be smaller.
Thanks for any advice I can get.
Dean
