Stephenup
Member
- Location
- Beaumont texas
I went to bid a job at a small machine shop and noticed it has a 480 volt delta system with new 480/277 volt wye panels,I called square d and they told me the panel and breakers were not rated for 480 volts to ground ony 277 to ground.I think my best solution will be to convert to 480/277 wye this can be done with a few minor changes and the utility provider will change out the transformers. My question.The motor loads and transformer only see the 480 volts so their should not be any problems with doing this..Now I will check all my boxes motors and transformers to make sure someone did not ground B phase somewhere in the shop.please any commet will be greatly appecerated. Thanks Stephen