Well what I have always seen run and have run to a 10 KW 60A max AHU was 6-2 NM and 8-3 NM for a range with 50 A OCP for the range. I was told that I was unable to run the 6-2 NM for the 60A max AHU and the 50 A breaker for the 8-3 NM range cicuit was against code. The inspector is not wrong, I was eventually able to find the NEC reference, since he did not offer one on his failure notice, but I have to admit it caught me off guard and we have completed hundreds of homes this way. So are any of you familiar with the rule that makes this illegal or have any of you experienced the same issue before?