On 11/27/2013 09:06 AM, TimR wrote:
I asked the question about a multiple tap transformer because I don't understand the details about how a part of a circuit gets "out of phase."


It is not two phase, it is a single phase sin wave.

AC current changes direction 120 times per second.

At any point in time (with exception of crossing 0), the electricity is either flowing

from L1 thru the neutral to L2

or

from L2 thru the neutral to L1