On 5 Jan 2006 09:59:38 -0800 someone who may be "bob" wrote this:-
That sounds unlikely, unless there are unusual factors like it passes through high temperature zones and/or thermal insulation and the installer decided to reduce the rating of the protective device rather than increase the cable size.
How do you know it is a ring? Who installed it and what do they know about electricity?
You are, but there are a few things to beware of. Most sockets on a radial circuit can appear to be on a ring (as there will be two cables connected to each terminal). If there are two cables connected to the protective device that can mean there are at least two branches of a radial circuit from the origin. If the type of circuit is not marked then the combination of protective device rating and cable size is a good indication of the type of circuit.