"Doug Miller" wrote in message
...
In article , RoyJ
wrote:


Assuming a nominal 240VAC supply, 245V is in no way "not correct" --
it's
only
about a 2% overvoltage.

And since there is likely no load in shop when the install was taking
place, the 245 would be a higher than normal reading.

But I question the use of "3phase" and "245 volts" in the OP question.
Around here, 245 volts would be perfectly normal for a single phase
circuit, very high for a "standard" 208/3 phase delta.

OTOH, why would the machine be set up for 220V as described, if intended
to be
connected to a 208V supply?

Because CNC controls are designed to run at 220V plus Zero/minus 5%.
They love straight 208 three phase power because of the balance. You can
usually just change control paremeters without fiddling with the
transformers.

Anyway, this shop owner did it so it's his job now to step in it.

JC