From my perspective here in the States it would make sense if you had Immersion Detection Protection devices for your hair dryers like we have. This would alleviate the dangers inherent in plugging them into sockets in other rooms..'tho your suggestion of 30mA trip levels sounds like an electrocution waiting to happen.
'Ring circuits' seem like a ripe candidate for being phased out. With all the interest and fears about stray electromagnetic fields (which ring circuits produce when one conductor opens and gets back fed from the other end) I would think that there would be an outcry against ring circuits..at leats for the ones using plastic covered wiring..Mineral Insulated cable would shield the magnetic fields, I would think.
Here, we require a dedicated circuit if an appliance takes up 50% or more of the circuit ampacity..so your idea of dedicated circuits seems appropriate.
I'm wondering 'tho about all the old masonry buildings which would look pretty cobled up if there were stipulations for lots of separate radial circuits..is that workable?
