On Sat, 04 Feb 2012 11:05:01 +0000 (GMT), "Dave Plowman (News)"
wrote:

In article ,
Don Pearce wrote:
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.

Unless you have unusually long cable runs or other special factors, it's
oversized.

When I did my rewire I was offered both 1.5mm and 1mm at pretty much
the same price - certainly within about five quid for 100 metres. That
made it a no-brainer.

d