On Sat, 04 Feb 2012 10:13:31 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Chris Morriss wrote:
Does not seem to be true. My wire tables say 2.5 mm diameter copper is more
like 10 gauge.


It's 2.5 square mm in area I believe, not the diameter of the core.

My fault for not stating it was the cross sectional area. But then our US
cousins quote gauge as if there was only the one. ;-)

2.5mm² equates to 13 AWG, IIRC. That is the cable normally used for UK
rings, protected by a 32 amp MCB

Lighting radials are normally 1mm² which would be 17 AWG, protected by a 6
amp MCB.

1.5mm² which is 15 AWG. My lighting breakers are rated 5A.

d