This section covers panelboards with feed through lugs and it has this which I find confusing:
Where an overcurrent device is installed at the supply end of the feed-through conductors, the busbar in the supplying panelboard shall be permitted to be sized in accordance with 705.12(B) (3) (1) through 705.12(B) (3) (3).
If there is an OCPD on the supply end of the feed-through conductors isn't that just like any other conductors from the panelboard with an OPCD? My idea of a feed-through is conductors attached directly to the supplying panelboard bus with no OCPD and feeding another panelboard.
Where an overcurrent device is installed at the supply end of the feed-through conductors, the busbar in the supplying panelboard shall be permitted to be sized in accordance with 705.12(B) (3) (1) through 705.12(B) (3) (3).
If there is an OCPD on the supply end of the feed-through conductors isn't that just like any other conductors from the panelboard with an OPCD? My idea of a feed-through is conductors attached directly to the supplying panelboard bus with no OCPD and feeding another panelboard.