Thanks CDN_Electrician
We have delta systems here in the states as well and there are many 480v systems with a center tapped neutral and a high leg on B phase. I have only run into an ungrounded delta once. The system fed a motor control center in a meat packing plant. So I understand why you would want to know if there was a ground fault on any given phase, since, as stated the system could run forever with one leg grounded. in trying to answer Sandro's question I do not understand the purpose of having an ungrounded delta system feeding a building. Also, as I see it if Sandro's customer does have a grounded delta system the light system would be of no value. ( Must admit I have never given this any thought until Sandro posted on this topic.) Can anyone provide an education on this?
