In Jamie t writes:

are you sure it isn't 208 ?

--http://webpages.charter.net/jamie_5"


I'd be suspicious that the 280V was a misreading somehow of 230V.
that sounds more plausible.

Or... of 208V. If you have a "three phase" circuit
coming into a building, and you run two "hot" wires
to your appliance (or motor), the effective voltage
you're getting is 208V.

There's enough overlap so that a standard 240V appliance
such as, say, a larger air conditioner, will work more
or less ok on 208V. And vice versa.

But there is most assuredely a difference in the
two circuits, so for optimal results, you'll want
an appliance (or motor) designed for the specific
wiring in your facility.

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