After reviewing this topic, I am looking for some input. It seems that conductor loading falls under one criteria and overcurrent protection falls under another, and they may not necessarily correspond with each other.
If I use THW wires (75-deg C) and have a non-continuous connected load of 290A on a 300A breaker, does the next higher breaker rule allow me to use 300mcm (285A) or do I need to use 350MCM (310A) since I have to size the conductors for the actual load? Please assume no use of 90-deg C conductors.
