Originally Posted by EarthBound
Where did you get this chart? I thought the 80% rule is for sizing circuit breakers and is independent of the cable to be used. I've also been led to believe it's fine to run 55A through a cable that's rated for 55A. Please let me know if that's wrong.
Continuous loads (expected to operate continuoulsy for 3 hours or more) are subject to conductor derating (80% rule).
Non-continuous loads which I think applies to most of our electrical builds can be sized for 100% of the conductor capacity.