I probably said it wrong, dont sweat it. I appreciate the help. It used to be a machine shop and has crazy power coming in. I think 400 Amp service but it could be more or less...There are at lease 5 different panels where the power is distributed throughout the building for various purposes. ...Some are standard 120v (for most everything), some are 220v for various machines that used to be here as well as air conditioning/heat pump compressors, and there are these 3-Phase outlets in random places (like the one I want to use) which I guess used to power big industrial compressors, arc-welders...stuff like that. Its confusing for everyone here including electricians so dont feel badi know a bit about this stuff and ya got me confused lol . oh well if you have an overhead feed ya should be able to see how many wires are feeding the building . is it three or four ?