480/240 center grounded delta

[buddhakii]

Hi all. Have a question regarding a 480/240v open delta service. Is there anything I need to be concerned about with the electrical panels or the ATS? I submitted on everthing with a rating for 480/277v. Do they even make equipment with a 480/240v rating? Just need to be sure about this before I release this to the supply house. I would think the 480/277 rating would be ok. I am only providing a neutral to the first disc. After that just installing the three phase conductors to run all the equipment. Thanks for the help in advance?

 

[jim dungar]

480Y/277 volt equipment is designed for a maximum of 277V to ground. A 240/480V center tapped delta will have a maximum voltage of 416V to ground on the wild leg. You should be using straight 480V 'delta' rated equipment.

 

[buddhakii]

After further thought that is the answer I came up with. I have dealt with plenty of 240 delta services but this is maybe the second 480 delta I've seen, and the first one was when I was a second year. Thanks for the help Jim.