"dennis@home" wrote in message
web.com...
On 27/05/2015 14:10, GB wrote:


I did wonder whether the cable is overspecified to allow for this.

No it isn't in a 2.5 mm2 circuit.

It is actually, essentially because very few rings have
anything like 13A going thru them for long and so
even if the ring is in fact electrically two spurs due to
a fault, that doesn’t see the wire the 13A is going
thru catch fire.

There must be loads of ring mains with breaks or dodgy connections, but
the number of electrical fires is fairly small.

They are small numbers in all the modern wiring systems.
Radials don't catch fire often either.

Because the insulation has been designed to ensure that it
doesn’t even when the wire is overloaded in a theoretical sense.