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240, single phase for houses

208 3 phase for comerical property, can be single phase.

480 volt for industrial property or 660 volts,

all 60 Hz

USA calls it single phase but there is actually 2 hot leads coming into the house with a natural and a ground.

  • It is actually two 120 volt 'hots' which are 180° out of phase from each other. Voltage between either of these and ground will be 120 V. Voltage between the two hots is 240 volts. It is single phase because it is pulled off one of the phases from 3-phase, then a center tapped transformer gives the two 'opposite phases' (ground/neutral is off the center tap)

In Vietnam we have 440 volts, 3 phase, 50 Hz on the poles.

They bring in one hot wire and one ground. I call this single phase,

It equals 220 volts in your house.

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