Why does a 400A NQ panel with feed thru lugs require a bigger box, like using MH56 instead of MH50?

Issue:
Why do feedthru lugs make the panel box larger?

Product Line:
Panelboards

Cause:
Using a bigger box.

Resolution:
Panel boxes are larger because the feed thru lugs need physical space to mount and additional wire bending space.

Released for: Schneider Electric USA