Does this make sense?
to run a 460V motor on a 600V system. All figures are approximate:
3 PH 40HP 460V motor FLA = 52A wire size is min #6 CU
600 to 480V autotransformer would be 13.5 KVA
(600V - 480V) x 1.73 x 52A = approx 11KVA
Use three 600V-120V 5 kva transformer in a buck configuration for a 15KVA bank, you will be wiring a motor that requires a #6
copper wire to feed it, to a transformer that has # 12 GA wires coming out of it. It doesnt seem right.
I bought a 30 KVA autotransformer that has #12 wires for connecton. The #6 wires that feed the motor get a bit warm during normal
use, I can imagine how warm the #12 GA wiring will be.
Am I missing something here?
