| To me, the problem is that "2 phase power" seems to refer to 90 degree
| systems and 120/240 is called "single phase" in all of the literature and
What do you call a system with 2 hot wires that are 120 degrees apart?
What do you call a system with 2 hot wires that are 60 degrees apart?
What do you call a system with 2 hot wires that are 30 degrees apart?
What do you call a system with 2 hot wires that are 105 degrees apart?
Sure, some of them would be labeled "weird". I would call them all "2 phase"
in reference to a category of any system with 2 phases. If I need to qualify
the phase angle, I can do that. "90 degree 2 phase" vs. "180 degree 2 phase"
and that should be understood.
| engineering discussions I recall. It is definitely true that many people,
| including very competent electricians, refer to "2 phases", "opposite
| phases", "the other phase", etc. when referring to 120/240V systems. There
| are other problems in this nomenclature. For example, in a 3 wire system it
| takes 2 of the "phases" (conductors) to get "single phase". For 120/240V, I
| prefer the term "leg" rather than "phase". It is also true that many people
"leg" seems such an odd term to me. But then, I think about these things in
a more mathematical way. I tried using "vector" once but no one seemed to
understand that one at all.
| use the terms "energy" and "power" interchangeabily, although they differ in
Oh, now THAT is a whole other thread waiting to happen.
| their engineering meanings. It's all about clear communication of ideas and
| I prefer to call 120/240V "single phase" along with most of what I hear and
| read. I spent a number of years an instructor in both electrical power and
| electronics and know how easy it is to say something that confuses rather
| than clarifies. Try explaining how two opposing vectors can sum to twice the
| value of one!! (It's all about reference points.)
"single phase" has always been an area of NON-clarity to me, because it means
"1 phase" to some and "2 phase" to others.
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