I was going toward the following scenario: Panels on roof (resi, SFD); DC thru roof into attic (accessable via pull down stairs); combiner box in attic; EMT thru second & first floor to basement; DC disco in basement w/inverter, net meter; POCO tie-in thru backfed CB in panel.
The DC conductors in the above scenario are unprotected (no OCP or disco) until they get to basement.
