On 11/09/2012 16:29, Thomas wrote:
Hello

Following on from my recent installation of an extractor fan.

The fan I fitted requires 4 connections: neutral, permanent live, and two
switched lives. I bought myself a length of 4 core cable of the required

Sounds like your bought one wire too few...

rating but I'm confused about which colours to use and whether there might
be a different coloured cable that I should have used.

Blue is neutral, while brown, and black are "live" colours (in the
harmonised colour scheme). Green/yellow is earth.

The cable that I bought has inners coloured brown, blue, black and
green/yellow. I wired the blue to the neutral and the brown to the permanent
live - leaving the black and green/yellow for the two switched lives. I have
a 3 pole isolator on all of the live cables, but even so, I'm not
comfortable with having a green/yellow for a potentially live cable and I'd
like to find a solution to this asap.

What is the normal convention in these situations - is there a 4 core cable
with different colours made specifically for this type of installation?

Its very bad practice to re-purpose a green/yellow CPC in a cable/flex.

The typical 5 core flex used by central heating installers may be more
appropriate. Or I would probably run a length of T&E and one of 3&E to
give five cores plus earth.



--
Cheers,

John.

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