Thanks guys, I've seen star-delta starters, and I thought all of them were mechanically interlocked so both contactors can not be energized at the same time? And the Y (star) contactor had jumpers across each phase..
The thing I'm dealing with right now, is a 300 hp motor, 480V 6 lead type. It has two starters, not interlocked together and the second starter is pulled in after the timer times out, just like a y-d..
I assumed they called this a star-star..
FYI, I'm putting in some new soft starter/optimizers.
Dnk..
