DIYbanter - View Single Post

Ralph Mowery

In article ,
says...

3 phase has an angle between each phase of 360/3 = 120 degrees.
2 phase has an angle between each phase of 360/2 = 180 degrees. And that's what you have with the US domestic 120/240 system.

The real problem occurs in a 3-phase Wye system.
A-N, B-N and C-N are each 120 volts. Until someone who doesn't know
how it works, takes A-B and tells the consumer it's 240v. And then
typically table saws go up in flames, because they REALLY do no like
running at 208 volts with a 120 instead of 180 phase shift across
the windings.

Naturally some people don't understand some things, nothing new there.

Some do not understand that by definition and the way it is generated, 2
phase power is 90 deg out of phase, not 180.

There for in the US the common feed of 240 and 120 volts can not be 2
phase.

https://en.wikipedia.org/wiki/Two-phase_electric_power