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Dunno, thats where design comes into play. To expand on the similar install. Although it was TPN in the plant room, because of the length of cable runs and TP loads, I had TPN board in plant room, submain TPN board on first floor, feeding 2 SPN submains also on first floor, TPN board in garage (submain off plant room) so for the house there were 5 DBs in total (and they were all stacked) - I think your concern about loading one phase up to 80A and they having a heat pump at 50A (bearing in mind how long there cycle is) maybe a bigger issue. Anyway its all about the design...I had thought
I had thought about a TPN board, but was wary of the fact one of the DBs the 25mm armour feeds has a 10mm shower circuit, 10mm induction hob circuit, 2 ovens, few rings circuits, few lightening circuits etc. So 63A on the armour may not be acceptable?
Do MCBs not go upto 63A max? Would the above load on the DB not potentially pop the 63A? MCCB panel sounds more appropriate as you can use the 80A MCCB to give it some more juice, but it must’ve been too costly for the client, and that’s why the spark had bought the 80A switched fuses