We know that motors can tolerate = / - 10% voltage variation. That math is simple enough on a dual-voltage motor (230 / 460, 120 / 230).
What if the motor is rated 120 / 208-230.
What is the actual permitted deviation at the higher voltage.
Can you apply the tolerance to the whole range?
For example, supplying the motor with 240 volts would still be less than 10% above 230, but it will be more than 10% above 208.
