I believe we should fix this problem and make it simple, main switch should be wired to suit the ELU and breaker should be line at the bottom, to cut out the silly bridge wire. I suppose if we had qualified people in the industry who use a little common sense it would be easy, lets just leave it here.

IT would be a lot simpler to fault find if DBs were wired with less bridge wires, simple busbar connections would make it way easier.

Take note of a typical SA wired DB, it's a mess (copied from another post on this platform)