That's the sort of thing I had in mind. Users find that if one of the loads trips the breaker, the others go off. So some bright spark spots that the 3P breaker looks like 3 1P breakers with a bar across the levers - and either finds out by experiment that they're a bit more joined together, or just goes and gets 3 more 1P breakers. It's just a breaker, couple of screws to change it - right ? Who needs knowledge of electrics or regulations when it's as simple as that 
Problem part solved - now when one circuit trips, it doesn't take the others with it. If you still have a problem that way, then the obvious next step is to fit a bigger breaker until it stops tripping - a bit like the old technique of fitting thicker wire, or wrapping the cartridge with thicker foil, or just fitting a bit of bolt, if you have fuses blowing.
Problem part solved - now when one circuit trips, it doesn't take the others with it. If you still have a problem that way, then the obvious next step is to fit a bigger breaker until it stops tripping - a bit like the old technique of fitting thicker wire, or wrapping the cartridge with thicker foil, or just fitting a bit of bolt, if you have fuses blowing.
