
RICK FITZPATRICK
New member
That is correct I beleive. But they have two phases of 120. Most homes have three wires from the pole to the breaker box. Two "hot" and one "neutral" Voltage measured from each "non grounded conductor(hot) to the grounded conductor(neutral) is 120v, but 180 degrees out of phase with each other., Measured across BOTH non grounded(hot)conductors is a single phase of 240. At least that was the way it was explained to me. Three phase 240( or 208), has 4 wires. Three hots, and a neutral. Voltage measured from any of the 3 hots to neutral gets 120v, but each is out of phase with the other, measured across any two of the three hot wires gets 240v, but each set of 2 is out of phase with the others. Hence-3 phase. And usually this is only available in commercial buildings. I wired 3 phase 240 and 3 phase 208 shops here.Most homes have single phase 240
fitz.
There's no such thing as double phase.
I'm not quite sure about that. I've seen "240v" motors that required the neutral as well as the 2 hot wires to run. That would provide double phase 120v. I've also seen motors that DID NOT require the neutral, which would provide a single phase of 240v. But someone correct me on that as I am no expert either. This is just an observation and I came to this conclusion. It may be incorrect. Hense, I'm not sure.
But let me add this for a little clarity. When you hook up "240" to your cloths dryer", you are actually hooking up 2 phases of 120v. As it requires the neutral to work. The motor uses one phase of 120v, the heating coils use the other phase of 120v. They never use the 240 available. At least, thats how the ones I've worked on are wired.
Thats "double phase" at work.
Let me also add this. That is why knightfly said to use one phase(120v) for the studio, and one phase for everything else. IF you have both phases in the studio, not only will it make for noise, it also creates a potential for a 240v MURPHY possibility. ie, a guitar amp pluged into one phase, and your mic/mixer on another phase creates a potential for AHHHHHHHHHHHHHHHH!!!!!!!! I've SEEN it knock people to the floor with burnt lips

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