Lieutenant Scott wrote:

I see. Why are lighting circuits never rings, and why does the
lighting wire sold in DIY stores always seem to be rated at 16 amps
ish, while I've never seen a lighting circuit have a fuse/breaker of
anything other than 5/6A.

The point of the ring is to allow 20A cable to form a circuit that safely
uses a 32A MCB.

There would be no point in doing that is you were using 16A cable with a 6A
MCB

10A is probably the largest size MCB you will see in a house for the lights.
You might see 16A used in factories etc. BTW it's not 16A lighting cable,
look at

http://wiki.diyfaq.org.uk/index.php?...es#Cable_Sizes



--
Adam