"Mark Lloyd" wrote in message
...

I think the people who are denying that it (residential 120/240) is
2-phase are considering the (1-phase) connection to the transformer
primary. You still have 2 phases inside.

You could be using 2 120V transformers (primaries in parallel, secondaries
in series with ground between then), a generator with a 2-phase (180 deg
apart) output, or even 2 120V (synchronized) generators. You still have 2
phases.


This single phase/two phase thing is almost as bad as the WD40 threads.

In the normal house at the pole (on the ground or where ever) the secondary
is a center tapped single phase feed to the house. There is very little 2
phase in the US. What is on the other side of the transformer going back
to the power company does not mater at all. The transformer converts it to
a center tapped single phase feed to the house.