Original poster: dave pierson <davep-at-quik-dot-com> >3 Phase: each phase 120 degrees apart from each other. Sometimes. >2 Phase: each phase 180 degrees apart from each other. If you are/were Nikola Tesla inventing 2 phase it was two phases at 90 degrees. (he later switched to 3 phase/120 degree...) Granted, this is obsolete, however this is the _tesla_ list. 8)>> best dwp