Yeah, after thinking a little more about it I realized that a motor that is rated for 240/208 volts will draw more current at 208 volts than it does at 240, without any change in the wiring. The tables at the end of article 430 show that.
I guess an inductive load like a motor tries to compensate for the drop in voltage to maintain power output? I'm sure this was all covered in one of my classes about 25 years ago or so
Matt