On Saturday, November 16, 2013 6:20:01 PM UTC-5, wrote:
On Sat, 16 Nov 2013 15:28:26 -0600, Mark Lloyd

wrote:



On 11/16/2013 12:50 PM, wrote:



[snip]



How those waveforms are derived, what else you call

them in a particular application, doesn't change the

fact of what they are and their relationship to each

other. There are many ways that such voltage waveforms

could be generated. It doesn't change the fact that in

a 240V residential service the two hots are in fact

180 deg out of phase realtive to each other.





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.



No, that's wrong. You only have one phase. It is split into two

legs. Words mean things.



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.

Yes, words mean things. And the term "phase" is a term widely
used in math, physics, engineering. In the context it's being
used it only means the relationship between two waveforms that
are present at the 240/120V dryer connection.

If you were in school and they hooked an oscilloscope with
two inputs up to:


Dryer hot 1 and neutral
Dryer hot 2 and neutral

and showed you those waveforms, only calling them waveform A
and B and asked what the phase relationship was between them,
what would your answer be?