Quote:
Originally Posted by Delphinus
How different is 220 from 240? As soon as we get talking about 3 phase and whatnot I kind of zone out because it's over my head. How do you run a 240 circuit?
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It's not different. Voltage varies across the country. 110-120v is normal, and 220-240v is normal ranges. Come call it 110/220 others, like me, call it 120/240. Just habbit. Now, taking as 3 phase power into a panel actually makes 110v and 208v It's hard to explain, but has to do with phase vectors and a bunch of trigonometry.
Just remember, Lower the voltage, the more current is needed for the same Power/Watts.
And FYI, a HP for an electric motor, is equivalent to 746Watts, regardless of voltage. Watts=HP.
So, for a 1HP motor, running at 240v =3.1 amps
same motor running 120V =6.2 amps
It's the same Watts(746) But the current draw on the wires is less.
now, if it was a 10HP, it would be 31amps or 62. THAT'S a large cable size difference.