Would all bathroom light circuits have a live and a switched live?

[R.O.S.S.I]

At some point this week I need to tackle installing an extractor fan in our bathroom as it currently doesn't have one.

The directions state it needs a live, neutral and a switched live feed as it has a timer, from the lighting ring.

I've not had chance to go into the loft and have a poke around the lights yet but just wondering if it will be a straight forward thing to wire in from one of the existing light fittings?

 

[R.O.S.S.I]

Slash, if there is no permanent live is that easy to run off from a junction box or something similar in the loft?

 

[R.O.S.S.I]

Thanks for the replies guys.

I'm assuming if i had means to wire it to its own dedicated switch that it would be an even simpler install? I think I may be able to run another cable down from the loft to the existing light switch (and just swap it for a 3 gang switch).

 

[R.O.S.S.I]

Extractor fan needs to be behind a triple pole switch.

Is that the fan isolator switch? I can wire one of those in if needed in between the fan and light switch, or are you saying that it can only be run to one of those?

 

[R.O.S.S.I]

I think i'll probably wire it to the existing light switch and run it off the timer that way, annoyingly where the cables run down to the existing light switch arent easy to access to run a new cable so will have to make do with the timer.

Just need to go grab some 3 core and earth cable one afternoon and have a bash at it.

 

[R.O.S.S.I]

You have no reason to go anywhere near the existing switch, take the Switch live, live and neutral + earth from the existing light fitting and run to new triple pole with 3core and earth, then run to extractor. You can do all this in the loft, you can install the triple pole next to the extractor fan in the loft if you wish.

If i wanted to run it on its own dedicated on/off switch I would. I was going to replace the 2 gang light switch on the landing with a 3 gang so that I could switch the fan on and off from the landing rather than rely on the timer and existing light switch.

But seeing as access to the existing light switch isn't possible from the loft i'm reverting back to running it as you say, by taking a feed off the existing light in the loft.

 

[R.O.S.S.I]

If you want it on its own switch you can just fit the triple pole as a pull cord in the bathroom and don't use the switched live.

I didnt want a pull cord.