Having a couple of decades experience in servicing/repair of commercial and
consumer electronic equipment and additional training and experience in
industrial site experience (both electrical and electronic circuits), I have
never seen descriptions or designations stated as 2-phase, for any type of
transformer.

Or: Hey bub, you gotta single-phase-in, 2-phase-out transformer?

But I have seen and used transformers with multiple taps, on both pri and
sec sides.
The number of taps on either side of a single-phase transformer don't change
the output(s) to 2-phase, regardless of how many there are (pri or sec
side).
Monophase sounds odd, like it's not related to electricity.
How about uniphase? Yep, found an example (and diphase) used in a book c
1905.
Electricity In Every-day Life Edwin J. Houston PhD. You know that's gonna be
interesting just because it was authored by a PhD.

--
Cheers,
WB
..............


"Michael Kennedy" wrote in message
...

Unfortunately. Maybe we should more generic terminology to describe this.
There is a difference in the phase of the two legs off of a center tapped
transformer. This can not be argued. Anyone who argues so can go hook up
a couple scopes for themselves as you suggested.

Maybe the confusion exsists because of the nature of two seperate phase
(split phase) power vs 3. Correct me if I am wrong, but any device
requiring 240V could be powered by 2 legs of a center tapped 7200V==120V
N 120V transformer or could be powered by a 7200V==240V transformer with
the same results.

That said Im sure someone will tell me why my theory of why this is a
confusion is wrong..

- Mike

Hmm.. I must have not drank my coffee yet when I wrote this.. 3 phase
would operate the same way therefore making this all bunk.