Were you using the total length of the circuit which is the out and back distance or only out? Were you using the same design load?
Your wire needs to be sized based on the lowest rated part of the system. You will not find terminations rated 90C, but the wire can be derated from the 90C ratings.
Your wire needs to be sized based on the lowest rated part of the system. You will not find terminations rated 90C, but the wire can be derated from the 90C ratings.