On Saturday, November 16, 2013 8:29:52 PM UTC-5, Nightcrawler® wrote:
wrote in message ...





No one is claiming anything is out of phase with itself.

The simple statement was made that one of the hot legs

of a 240V dryer is out of phase with the other by 180 degrees.

Look at them on a scope, what do you see? Phase in this

context is just the relationship of one waveform to another.

Two waveforms can differ in phase from 0 to 360 deg. With a

sine wave, when one differs from the other by 180 deg, they

can also be said to be the opposite of each other.



Re-read what I wrote, and what you and others are trying to

assert. Think really hard about it.

I have thought hard about it and I'm fully aware of
the meaning of the term phase.




The secondary of a

residential transformer only has "one" winding. It is fluxed

by "one" winding. Meaning that it is not a poly-phase system

Hence, no phase shift.

Hook up a dual input oscilloscope to hot 1 and neutral
and hot 2 and neutral at the dryer. Show that plot to a school student
and ask:

"What is the phase relationship between waveform A and B?"

What's your answer?



How the primary winding is powered

varies, and just might use two phases of a three phase system,

yet since there is only one secondary winding, the secondary

winding only has one phase angle. Zero offset between the hot

legs and the center tap for there is only one winding and either

side of the center tap is at the same phase angle as the other.


Each side of the secondary is 180 deg opposite the other. It is
referred to as "split-phase", right? When you split a something,
do you still have just one?

He

Split-phase electric power

http://en.wikipedia.org/wiki/Split-phase_electric_power

"A split-phase electricity distribution system is a three-wire single-phase distribution system. It is the AC equivalent of the original Edison three-wire direct current system. Its primary advantage is that it saves conductor material over a single-ended single-phase system while only requiring single phase on the supply side of the distribution transformer.[1] The two halves are 180 degrees apart with respect to center point. "


Note the very important last sentence. That is all I and Mark
Loyd and others are saying.





To kill two birds with one stone.



In the utility world, the term "phase" references one leg (output)

of a poly-phase system.

Yes, but the utility world doesn't own the term phase.
It's widely used to describe the relationship between two
or more waveforms in math, physics, electrical engineering.
And in the broadest sense, in any of those fields, it's
simply the relationship between two or more waveforms.
Exactly how they got generated doesn't matter. If you
can hook up a scope and see two different waveforms and
one is 180 deg out of phase with the other, then that
is the relationship, is it not? And two sine waves
differing by 180 degrees is what you get from a
center tap transformer delivering 240/120.