My concern is when power is fed from the bottom and brought to the terminals first. They are Weidmuller WFF300, and their SCCR is that of untested power distribution blocks, which is 10 kA according to table SB4.1 of UL508A. This is clearly a bottleneck for me, unless we can disregard these, as they are themselves enclosed in a sub compartment of the main stand-alone enclosure. I read again and again on the matter and could not find a satisfactory answer to this specific case. Obviously, in some installations, it will make a huge difference if the customer specs out a SCCR the unit should be capable of handling.
Anybody knowledgeable with UL 508A SCCR?