But 240.4 says "Conductors, other than flexible cords, flexible cables, and fixture wires, shall be protected against overcurrent in accordance with their ampacities specified in 310.15, unless otherwise permitted or required in 240.4(A) through (G)."
So for say a 100A feeder with a calculated maximum neutral load of 60A, consisting of #3 Cu ungrounded conductors and a #6 Cu neutral conductor, how is the #6 Cu neutral conductor protected against overcurrent in compliance with 240.4?
Or getting back to the OP, if the calculated load is 100A continuous, and so a 125A OCPD, #1 Cu ungrounded conductors, and a #3 Cu grounded conductor are used, how is the #3 Cu grounded conductor protected against overcurrent in compliance with 240.4?
I don't see anything in 240.4(A) through 240.4(G) that would cover these situations, yet other code sections indicate they are allowed. Seems like a conflict.
Cheers, Wayne