"Christian McArdle" wrote in message .net...
AIUI, 2.5mm cable run in contact a conductive surface with the rest
of the cable completely surrounded by insulation is rated at 21A
which is sufficient for a 32A MCB protected ring main.

I don't have my OSG on me either. However, I seem to recall a 50% reduction
for being buried in insulation, which is what you would have to use if using
the OP's original idea of letting it float within the cavity, not clipped.
This would mean his original plan would be seriously non-compliant, quite
apart from the cavity bridging issue.


But it is reduced from 27A "clipped direct". This is the *new* table
4D5A in the regulations or 6F in the OSG. Note that 21A is given with
"method 15" - where the cable is partly surrounded by insulation.

Sorry, brief message. My experiment with NS6 on this G3/300MHz/64M/OS9
Mac using Google is rather sss-lll-ooo-www :-/

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
(As a reader only): http://www.livtech.co.uk/