"Martin Eastburn" wrote
For a large joiner, 2 or 3 phase is likely and likely wanted as well.
2 phase is real 3 phase with a missing leg. It isn't single phase 220.
2 phase is nothing. It makes a machine sit there and hum.
Normal residential 220, or 240, is single phase. Phase indicates how many
lines have electricity in them with a sine waveform of voltage over time.
Three phase has three lines, and each have their own sine wave going that
are 120 degrees out of sync with each other.
Residential 240 has one hot line coming to the transformer. It has one sine
wave. The transformer is center tapped and the juice is sent down two hot
lines to your house. It is the same sine wave that is now 180 degrees out
of phase. Still single phase. Ground to either line is 120. Line to line
is 240. Still single phase.
Then there is a mixed three phase, as was in my school. Three hots, three
sine waves. We did not have single phase 240. If you were to tap from one
hot line to another, you got 208 volts. Y tap, I think they called it. I
don't recall what the 110 volt was from hot to ground. Around 113, I think.
Bad idea to run a motor intended for 240 on 208, when it is being used at
close to its rated maximum load. Decreased voltage causes it to draw more
amps, and more amps means hot and eventually burn out.
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