On 2013-11-27, John Rumm wrote:

On 27/11/2013 10:49, Adam Funk wrote:

Does that apply outside the CU too, though? Would it be acceptable to
run a 4 mm^2 cable from a CU up to a junction box upstairs (let's say
it's a good one with Wago lever blocks in it) & then make a ring of
sockets with 2.5 mm^2 starting & ending at the junction box?

Its not a standard circuit as such, although its close to being a trunk
and branch radial in some respects. Its one of those things that you can
demonstrate will work, but at the same time has the potential to cause
confusion later. Its not ideal since you then can't adequately test the
circuit from the CU since you don't have access to both ends.

Good points (as always), thanks.