Chances are you don't fry everything on three circuits, but it is the lesser expensive items with resistance heating elements and relatively low resistance through those items which will see less then normal operating voltage during the event that will survive and the higher dollar items with electronic controls, processors, etc. and a high resistance through them that will see a higher then normal voltage during this event that will be damaged nearly every time:happyyes:
Can't really shoot your assessment down save one fact that I'm uncertain of at present... and I underlined that in the quote above. Are neutral bus terminals rated 90°C? I've never checked, and the one thing that makes me question that is I've never seen a "set-screw" terminal rated higher than 75°C. If only rated 75°C, the potentially overloaded neutral conductor will not handle as much current as you suggest at the neutral bus termination... and exactly why it would show signs of insulation degradation there before elsewhere, at least within the panel enclosure... The insulation will typically be rated 90C and many neutral bars will also be 90C (as a stand alone value anyway, as part of the panel assembly instructions may still call for 75C) ...
waiting to be shot down
And that actually got added in 2008.
There are many components with AL9CU marked on them, seems like many Square D equipment ground bars are marked with this as well (could be mistaken), many of their panels have same design bars used for neutral terminals. But that doesn't mean the entire assembly is recognized with 90 C terminations, though a neutral bar has a better chance then a circuit breaker, I think, unlike the breaker we are not trying to sink some heat from within the breaker into the conductor.
IDK.
just kidding, don't throw rocks
