Article 250.122(F)

[don_resqcapt19]

Don,

Who is running a feeder so large in a cable tray that it's associated EGC is 3' away?

I get it distance adds imedance yet other than someone's vague recollection of lab tests we have no real life examples of a problem.

Likely the same kind of lab that tells us NM is overheating. :roll:

I know there were a couple of cases where this happened that I read about, but can't find any links.

I think a far better choice for large capacity circuits is an engineered cable bus system, or bus duct system.