jk wrote:
Yep, I calculate 231 V, So 230 Would be about right, assuming your
240 is a standard center ground 120/240 single phase system.
Do the math, it is a simple calculation.
Hmm, I come up with 208 V (207.846 actually)

The math is sin (60 degrees) * 240 V or

tan (60 degrees) * 120 V

both give 208 V.

This is the voltage from the center of the 240 V single phase source
(neutral) to the generated phase. But, it really isn't a useful
reading, as the motor never sees this voltage. All it sees are the L-L
voltages.

Jon