Hi All. I'm a little new to the electrical design world and am not school trained to do what I'm doing. My background is in Biomedical Instrumentaton. So it's 'Trial by fire.' I have one question that concerns me as I dont want contractors to get PO'd with me.
In 480V three phase systems with a generator to run parallel with utility; do I have to specify 4-wire if no 277V loads are going to be used?
There is a considerable diffence in the cost of a 3 Wire ATS Vs a 4 wire ATS and this is my reason for asking.