On 1/29/2011 12:37 PM, Jamie wrote:

Yes, 2 phase of 90 degree's still exist, so why is that ok but 180
degree's isn't?

Because it's STILL a SINGLE phase across the transformer.

Look at power generators (portables), most of them have 2 circuits from
the generator 180 out from each other.. Why is this any different from a
generator of 90 degrees out ? You can combine a leg of each output from
a those generators also..

I serious doubt they make 90 Degree 2-phase generators.

As to combining multiple output windings from a SINGLE phase
generator, the output is STILL single phase.

It's argument that you won't win from those that truly understand the
meaning of phase angle supplies and the number of supply legs.

You're right, _YOU_ won't win that argument.

On combining multiple phases...

On more occasions than I care to recall, I've seen some poor
schmuck buy a 3-5 HP 240 VAC single phase motor, either on a
table saw or an air compressor, and have his "electrician
buddy" give him two of the 120 volt phases of the 3-phase
power in the shop to run his new equipment with.

Aside from the obvious, the voltage is 208 (Not 240), there's
a 120 phase difference between the two leads feeding the motor.
I usually get called in about 2-3 weeks on a "warranty request"
for said motor that just went up in flames.

Jeff