When two solar systems are connected in a combiner panel with 2 breakers ( 40A and 20A ) the output of the combiner panel is 60A, so based on 75 degrees C and 90 degrees C, we should be able to use #6. Is there a reason why the AHJ would require you to upsize the wire to #4 so that the conductors satisfy 60 degrees C as well per 110.14 ( C).
Per my understanding, 110.14(C)(1)(a)(3) allows the conductors with higher temp ratings if the equipment is listed for use.
The 60A PV breaker ( after combining) and the output lugs in the combiner panel are rated for 60 degrees c or 75 degrees C so there's no requirement for the conductors to be sized for 60 degrees as well?
Per my understanding, 110.14(C)(1)(a)(3) allows the conductors with higher temp ratings if the equipment is listed for use.
The 60A PV breaker ( after combining) and the output lugs in the combiner panel are rated for 60 degrees c or 75 degrees C so there's no requirement for the conductors to be sized for 60 degrees as well?