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Ralph Mowery

In article ,
lid says...

Whether you have 1 phase or 2 depends on the reference point, either the
middle of the (center tapped) transformer secondary or one end. It seems
normal to use the point that's grounded.

Just as if you have a person on the north pole and one on the south pole
of the earth. They are standing and extend their right hand past their
head. Which one is pointing up ?

If you are a space ship and can see them both. The seem to be pointing
in opposit directions. So then which one is point up ?

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