A 400A bottom feed MB load center has feed through lugs on the top side. There is a 250A ML load center installed directly next to this 400, with lugs rated 6-350. Can this 250A ML load center be fed with 250MCM from the feed through lugs on the 400? Calc load on the 250 will be around 100A. Is article 240.21 in effect here? The tap is not directly to the feeder itself, but rather to the bussing which has OCPD of 400A. If not 240.21, which article would allow this install?
Thank you for useful input.
Thank you for useful input.