I'm planning to install an inline extractor to my shower room, vented to the soffit through the loft space. The inline unit is class 2, with overrun timer and I'm taking live and neutral from ceiling rose. There's no earth in the lighting circuit, but everything looks in good condition.

My plan is to take live and neutral from celing rose using twin and earth (with earth trimmed back) to a fan isolator switch in loft space. Wire to fan via a pull cord switch on the ceiling in the shower room.

Can I split the live before the pull switch to give the fan a live and switched live? And, if so, what's the best way of doing this?

Thanks for your help

As you say you can take L/N from lighting ring ,P/ L to allow fan over run and then take another L from lighting ring and run it through pull switch to form your S/L to fan or use existing S/L to light,if you want fan to operate when light turned on
fan will be double insulated and probably will not require a earth attachment

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Thanks white pan man

I want the fan to operate independent of lighting hence the need to split the live to create a switched live. Any idea of the neatest way of doing this? Can I run a single through some trunking?

Thanks again

take a butchers at this, may help
http://www.ultimatehandyman.co.uk/diy/e ... itting.htm

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Thanks Dave...perfect

I 'd forgotten about 3 core + earth. As I'm not planning on using the earth (no earth in lighting circuit and fan is class 2), I don't suppose it's permitted to use twin + earth and use the earth as a switched live (using appropriate coloured tape, of course )

*fully expects to be flamed by people in the know*

Thanks

Probably the neatest way would be to use 1mm or 1.5mm "singles"

ie 6241Y and 6181Y (google for them and hope that a shed near you sells them by the metre)

These are double insulated and do not need trunking.

no, you must NEVER use the earth wire as anything but the earth. it is highly dangerous to do so.

OK - thought not

Thanks everyone for your help - I gonna use 3 core + earth (but trim the earth back 'cus I'm not using it) and use a JB to create the switched live via twin + earth and a pull cord

Just got to do it now...

even if you are not using the earth, you still need to connect it at source.

When you say "at source" do you mean at the fan end or the lighting end? In my case, neither have an earth terminal so trimming it back would be safest, I would have thought?

Source would be source of supply in your case the ceiling rose... even though you may not have any earths in the earth termininal it is still best practice to connect earth in. (Will not actually do anything for your installation as nothing connected), but is there for future use should it ever be required...

Of course you could snip it off (wont effect workings) but is not best practice

The lighting circuit does not have an earth (commonplace in 60s & 70s in the UK). The installation has been tested fine, and the cables look in good condition so I don't intend to rewire

Agreed loads of houses dont have earths to lights or even earth into consumer unit!!...

I guess best pratice takes into account future ammendments,(ie if metal fitting was installed then earth would be required to that light fitting, if earth has been snipped off then more work than leaving there in 1st place.....)

As stated above snipping wont make any difference to the working of your fan. :)

I thought you had to connect the earth at the source to protect the cable just in case someone puts a drill through it. I'm not a sparky but seems right to me

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Absoultly correct.... however in this installation thier is no earthing at source (ie ceiling rose) its is however best practice to allow for future ammendments (Especially as the earth core is already there). (Not a requirement!)

Likewise its not a requirement to use Twin and earth cable to supply the fan, could use singles, as extractor fan doesnt require an earth you would only run over the supply cables anyway (if that makes sense)