Does Square D offer a 225A Feed Thru Lug Kit for a NQ Panelboards?
Ordering and Installing
The NQ Panelboard does have the option for Field installation of the NQFTL2L
kit, for (30, 42 ckt) interiors and the NQFTL2H
for 54, 72. and 84 ckt interiors.
Boxes will NOT need to be changed out to larger sizes when using a 42 ckt Main lug, or Main breaker interior. All other interiors will require a larger boxes.
See pg 9-9; Tables 9.16 and 9.17 in DIG 176 Link below for Box size changes needed
Instruction Bulletin for Installation is attached