Originally Posted by
Brewster Buffalo
From my limited electrical knowledge I would have thought that , if a fault occurred in the ground floor wiring circuit , the 30amp fuse would go first and that would protect the 60amp fuse but is that wrong?
That's the theory. But if there is significant pre-load on the upstream (60 amp) fuse, it could go first (or both at the same time) due to a fault downstream of the 30 amp.