So in case you didn't get that last posting, YES, you can size the conductors for 58% of the motor nameplate current. All 6 of the conductors going to the motor will be carrying current all of the time. The issue of the contactor shorting 3 of them during the Start sequence is irrelevant; the conductors are sized for the running condition and when in Delta (Run), each of the 6 conductors will carry 58% of the motor current. But don't let the 58% confuse you as to the sum being 116%, it is not. The issue at hand is that the current through each conductor path is the motor current divided by the square-root of 3 (1.732). So if the motor FLA were 100A, the Delta current in each of the 6 conductors would be 100 / 1.732 = 57.736, which is rounded up to say "58%".
