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I work for a large midwest medical university we have almost all of our high voltage inside in a some what climate controlled enviroment (basement) with no sun exposure supported by cable trays. The cable is all copper three conductor, 15KV (running at 13.8 KV)IAC amoured cable, 133% insulation...

Thanks to every one who responded. Your comments & links were very helpful.

From my research copper adds 15% to the cost. However it holds up over the long run better than aluminum with no de-lamination worries, lower coefficient of expansion (creep) and higher tensil strength. Also this will be a liquid cooled unit as opposed to a air cooled unit. This is being...

I am preparing a presentation to buy a 750 kva 3 phase transformer. I need some facts to present that will inform the "powers that be" that one type of winding is superior to another.