"Don Murray" wrote: It's not really a center tap. There's two separate
coils on the secondary and for a 240 transformer the 2 coils are in series,
(clip)
^^^^^^^^^^^^^^^^^^
I think what he meant was that the windings on both sides of the center tap
may not be identical. This could be true whether or not it is a literal
"center tap," or an electrical equivalent obtained by hooking two windings
in series, with a lead coming off. This would result in a VERY tiny
inequality in the voltages on both sides of neutral. It would NOT result in
any deviation in the phasing on the two sides of neutral.

This would hold true on Tuesdays, as well as other days of the week.