>Is this yo have better ground-fault
>protection (since it's a TN system)?

This is in fact one of the advantages of the ring main. It offers a high integrity earth. If for some reason the earth wire comes loose or break along the way, there is backup wire on the other side. Therefore, the risk of finding yourself with a live socket without earth is minimal.

I really like the idea of a ring system, but I don't like overfusing it. Your opinions on a ring main with 20A fuses? It would allow long runs with 2.5 mm2 cable and offer high intergrity earth, without any risk of fire. This should be of special interest to Americans, since cuircuits in 120V wiring are limited by voltage drop much more often than our 230V ones. (Forget the NEC for a moment - think free! [Linked Image] )

[This message has been edited by C-H (edited 10-14-2002).]