<snip>
> Just *imagine* the size of the series resistor you would have to install to drive one of those 600V motors with 750V ;-)

I don't know but it could probably be done. On the other hand, I did observe the the effects of running a new unit at 600V, when they tested the three segment unit in front of my apt on the tight turn. There were dull yellow sparks flying every time it hit a bearing point.
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