Two phases or not?
If there were two electrically isolated windings, with opposite polarity,
you would clearly have two phases. (I think.)
But the center tap gives them a common neutral. So are they still separate
phases? I'm inclined to say yes, because in a conventional three-phase
system, loads can be attached to individual phases, or across two phases for
a higher voltage. And these are considered multi-phase systems.
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