If I recall there is a section in the NEC stating that for any breaker with an ampacity less than 100A you must use the 60deg C rating for determining cable ampacity for cables I believe up to size #1.
Is this always the case, that you must use the 60deg column or if you know that the breaker terminals are rated for 75deg C then can you use the 75deg rating?
Is this always the case, that you must use the 60deg column or if you know that the breaker terminals are rated for 75deg C then can you use the 75deg rating?