MC or AC Ampacity Calculation

[xformer]

Doesn't 310.15B3a4 and 310.15B3a5 contradict each other?

 

[Smart $]

Not that I can see. The conditions are different.

 

[infinity]

I agree with Smart, if you cannot meet all of the conditions in 310.15(B)(3)(a)(4) then you would apply (a)(5).