On Saturday, November 16, 2013 6:12:14 PM UTC-5, wrote:
On Sat, 16 Nov 2013 14:54:22 -0600, sam E

wrote:



On 11/16/2013 10:34 AM, wrote:

On Sat, 16 Nov 2013 01:17:23 -0500, Wes Groleau

wrote:



On 11-15-2013, 19:58, wrote:

180 degrees, but technically, no. It's opposite sign, not 180 degrees

out of phase.



Same thing



No, it's not. It's one phase.





If the angle between the phases was anything other than 180, would you

call it 2 phase? If so, why this oddity?



Probably. Not sure what your question is,

I believe his question is the same one I have, which is why
you insist on referring to a 180 deg phase difference between two AC waveforms only as "opposite" and deny that it is also correct that they differ by 180 degrees in phase. 180 deg is just one possible relationship between two
waveforms, where one is the opposite of the other. And that is what
you have at the dryer connection.



but 2-phase, where the two

are 90 degrees apart is interesting in that any phase relationship and

any number of phases can be generated with simple transformers and a

(very small) bit of trigonometry. It's quite useful but exceedingly

rare.



Two phases generated 180 degrees from each other make no sense at all.

Except of course to run the dryer, because regardless of
whatever you want to call it, there are two hots going to that
dryer that differ in phase by 180 deg. If you were in an EE
physics, or math course and they presented you with a voltage vs time
graph of two waveforms that you would get from an oscilloscope
hooked up to:

Hot 1 to neutral and
Hot 2 to neutral

And they asked, what is the phase relationship of these
two voltage waveforms, what would your answer be?