Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net> Long ago I said I'd scan a few pages from a wonderful GE manual covering what overloads polemount transformers can handle. There is something about temperature deration as well. http://energybeam-dot-com/tesla-coil/08-11-2003/ KEN