Three phase lines in USA

Three phase power has not been supplied to homes in quite some time.

Yes.

No. The voltage between two of the wires is 240. The voltage between either of these "hot" wires and the other wire is 120.

No. The old three phase system had four wires. That is 3 hot wires and one common ground. We call that Y connected.

Similar to our 3 phase system, but we use 60HZ. Jim

It has got to be better than my Spanish.

Yes and no.

It is not used for residential applications,

This wiring configuration is commonly known as the 3 wire Edison configuration.

It consists of a 240V transformer secondary winding with a center tap.

Leg to leg(L1 -L2) = 240Volts

Leg to center tap (L1-N) = 120Volts.

Both are 60 Hz, single phase, not 3 phase.

If you need 3 phase power in the US, it is usually only provided in commercial/industrial areas.

HTH

Lew

Answer: "It depends". 120/240V single-phase is, by far, the most common. for pure residential use. However, there are towns where some areas have three-phase distribution, and a given house will have "2-of-3 phases" from the pole, giving 120/208 V.

Note: in such locales, the customer does *NOT* have any choice as to whether his property is served by 120/240 single-phase, or 120/208 '2-of-3 phases'; the customer gets "whatever the neighborhood is wired for".

Bigger apartment (or condo) buildings, are more likely to have three-phase into the building, with "2-of-3 phases" going to any particular unit.

Unless it's 220/417 V, but you're only going to see that in commercial/industrial buildings.