In alt.engineering.electrical JANA wrote:

| If you are in North America, and have 120 VAC to the outlets, what you
| call 220 or 230 VAC in your home is actually 208 VAC, unless you
| installed some kind of transformer to compensate.

That's only true if the source transformer is a three phase WYE/star type.
If you have center tapped delta three phase, or single phase Edison split,
then you have genuine 240 volts (although with that delta you may also have
a third wire that is 208 volts relative to ground/neutral).


| I somehow think that the vendor of the motor made an error. Having 280
| VAC sounds to me very unconventional, unless this was some kind of
| special installation.

It may be a reference to working on 277 volts, which is an available voltage
in some large commercial/industrial locations.

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