Table 430.250 has a 15 hp rated at 21 amp. Times that by 125% and the conductors need to be rated for 26.25 amps.# 12 is only good for 25 amps. # 10 awg cu. is good for 35 amp using THHN.Article 430.51 allows for a higher ampere rating than the conductor ampere listed in table 310.16.Bluezebra said:I'm feeding a 15hp VFD from a 32amp ABB breaker, the VFD is controlling a 480volt 15hp motor, the FLA is 17amp@460volts. My question is can I feed the VFD with #10 thwn cu?