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Bathroom Extractor Fan Wiring

This topic originated from the How to page called Installing wiring for an extractor fan
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LaurenceGregory

from United Kingdom

Joined: 27 Aug 2003
Posts: 4
Location: United Kingdom

PostPosted: Wed Aug 27, 2003 8:50 am Reply with quote

1. Where can I take a feed from to supply the Double Pole FCU, must this be from the 13A ring main or can it be from the Lighting circuit?

2. From the Double Pole FCU (located outside the bathroom) must there also be a Double Pole ceiling mounted switch as well in the circuit?

3. Could you supply a typical wiring and/or circuit diagram to show this?

Regards,

Laurence Gregory
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breezer

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PostPosted: Wed Aug 27, 2003 10:04 am Reply with quote

if you use a fused spur you can take it from the lighting circuit, also if you leave out the switch you then wire it across the bathroom light supply, so anyone using the bathroom turns on the lights and the fan starts
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LaurenceGregory

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Joined: 27 Aug 2003
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PostPosted: Wed Aug 27, 2003 3:53 pm Reply with quote

Thanks for that Breezer, the only thing is, I don't want the fan to come on when the light does. I would like the option to just have the light on without the fan. So in this case how would I wire it up? (PS there is a window in the bathroom so the "not to have the fan come on with the light option" complies with Regs .

Laurence Gregory
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breezer

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PostPosted: Wed Aug 27, 2003 5:55 pm Reply with quote

similar as previously mentioned but you should install a pull cord switch in the live to the fan, also you should feed it from the live, not switched live
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PatM

from United Kingdom

Joined: 24 Jan 2004
Posts: 1
Location: United Kingdom

PostPosted: Sat Jan 24, 2004 10:40 pm Reply with quote

[Arising from 27 August post]

Hi Breezer (or others) - I've looked through this site and others for info on wiring a timer fan on the lighting ring but controlled by a separate pullcord not by the light switch. Before you ask, the instructions with it don't show wiring of a timer fan for non-light-switch control. I am a bit confused by your reply about wiring in a pull cord in the live to the fan.

I can't work how how it would go there - but I must have misundertood what you meant.

The way I understand the circuit should work is:
1 Lighting ring live to pull cord to
2 Pull cord switched live (black/red) to junction box terminal (Switched live) to
3 Switched live (yellow in 3core+earth) to
4 3pole isolator switch to
5 Timer fan

The 3pole isolator switch would also get live and neutral (blue) feeds from the lighting ring

I had laid this out as ASCII art but that won't work here icon_sad.gif


Thanks for any comments/warnings/advice

Pat
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breezer

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PostPosted: Sat Jan 24, 2004 10:53 pm Reply with quote

colour choice is yours, but all you need to do is take feed from light (permanent live neutral and earth) take it via 3 pole switch to fan, then from fan to second pull cord (2nd pull cord operates fan)
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securespark

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PostPosted: Sun Jan 25, 2004 2:28 am Reply with quote

Forgive me for being thick, breezer, but why do you need a triple pole isolator if you only have L+N coming in a DP will do, surely?

And in case anyone reading this is interested, you can get pull cord triple pole isolators for fans so you can put iso in bathroom. Ashley make them.
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breezer

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PostPosted: Sun Jan 25, 2004 8:39 am Reply with quote

in case it is a timed fan.

so that the live , switched live (timed fan) and neutral are isolated
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securespark

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PostPosted: Tue Jan 27, 2004 6:14 pm Reply with quote

Breezer

Surely that means a live feed to in terminals of triple pole fan,

live and neutral feed from out terminals to fan. tap off somewhere for live to operating switch, taking the operating switch output to the incoming switched live terminal of triple pole isolator. THen the switched live out terminal on isolator goes to fan.

Or am I seriously up the creek?
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breezer

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PostPosted: Tue Jan 27, 2004 6:58 pm Reply with quote

sorry i read but do not quite understand.

what i am saying is you must be able to completely isolate the fan, so in effect you take a 3 core t & e fom the light (L, N & switched live) to the triple pole isolator then to the fan
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securespark

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PostPosted: Tue Jan 27, 2004 11:35 pm Reply with quote

Breezer he wants the light to come on without fan, so you could wire a sep pullcord just to trigger fan.

OR Just switch off the triple pole iso when want light on its own.
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breezer

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PostPosted: Tue Jan 27, 2004 11:37 pm Reply with quote

R, I C
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billyrae

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Joined: 09 May 2004
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PostPosted: Sun May 09, 2004 3:49 pm Reply with quote

Hi folks,

Sorry if I'm being thick but from a safety perspective what is the purpose of the triple pole isolator. How does this help if it's always switched on as would normally be the case?

I am in the process of installing a fan connected to a 6amp lightiung circuit.

cheers for any help.
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dingbat

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PostPosted: Sun May 09, 2004 3:55 pm Reply with quote

billyrae wrote:
Sorry if I'm being thick but from a safety perspective what is the purpose of the triple pole isolator. How does this help if it's always switched on as would normally be the case?

I am in the process of installing a fan connected to a 6amp lightiung circuit.


Firstly, you picked an old thread for this topic - how far back did you read? icon_biggrin.gif

But to answer your question, if you have a fan with a timer it requires a permanent live, a switched live and a neutral (as well as an earth of course). The three-pole isolator is so that you can safely isolate the supply to the fan without having to isolate the lighting circuit you've connected to.
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billyrae

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PostPosted: Sun May 09, 2004 4:02 pm Reply with quote

Thanks for the quick reply. So am I right in saying that the isolator is for convenience rather than a safety requirement as I can always switch off the entire lighting circuit at the consumer unit to work on the fan?
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