On 28/01/2019 15:03, Tricky Dicky wrote:

If you follow the wiring diagram John pointed to in the Wiki, then
the colours are immaterial as they all end up as switched lives and
both black and grey should be sleeved brown. The only need for the
colours is to differentiate which core is which making sure the same
wire connects COM to COM, L1 to L1 and L2 to L2. The same applies if
you are using the old RYB 3 core + E.

I would say that if using Blue + Brown for a switch drop wire, then the
blue should be sleeved brown since you are not using it for its normal
purpose.

However using 3&E, all the cores have "live" colours[1], and so only
need over sleeving should one be re-purposed as a neutral.

[1] Although there is an argument for addition sleeving if being used in
and installation that mixes old and new colour schemes.

--
Cheers,

John.

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