Permanent live for a bathroom extractor fan

[con1_uk]

Hi, I currently have a extractor fan that goes off when the light is turned off, if I upgraded to a unit that stayed on after the light is switched off could I get a permanent live from a nearby shaver socket please? All wiring would be outside the room.

Thanks.

 

[terryplumb]

Is the shaver socket on the same circuit as the light and fan ?
Have you checked the wiring at the light position,there may be a permanent live present there ?

 

[Notch7]

if the extractor fan switched live goes to the light switch or to an accessible place in the ceiling -say the loft or light rose, then could you not just move the fan live feed from switched to permanent live

 

[Taylortwocities]

if the extractor fan switched live goes to the light switch or to an accessible place in the ceiling -say the loft or light rose, then could you not just move the fan live feed from switched to permanent live

No he can’t. The timer fan needs switched live, permanent live and neutral.

 

[Notch7]

No he can’t. The timer fan needs switched live, permanent live and neutral.

ah yes of course that makes sense.

A switched live I guess is needed to get signal when light switch is operated

 

[JohnD]

It is usual to get the Permanent Live, and the Switched Live, and the Neutral and Earth, from the ceiling rose of the bathroom light.

In UK wiring this is where they are usually present, though they might all be at the light switch, or more rarely in some other junction box.

 

[chivers67]

Normally to feed the Fan you'd have a three core an earth. The Fan I have doesn't require an Earth so it is folded back inside the fan and taped up.

 

[EFLImpudence]

If the fan you are installing doesn't require an Earth I see no reason why you couldn't utilise that conductor as a permanent live as long as it's sleeved appropriately at both ends.

You can only do that with flexible cable where the (green&yellow) conductor is insulated throughout its length; not with twin and earth.

 

[Taylortwocities]

If the fan you are installing doesn't require an Earth I see no reason why you couldn't utilise that conductor as a permanent live as long as it's sleeved appropriately at both ends.

Not permitted. That's cowboy advice.

A live conductor must be insulated and sleeved. The (bare) cpc in the cable is not insulated. Also, earth needed or not, the cable must contain a cpc.

 

[chivers67]

Sorry T2C, I've amended my post three core & earth or another single core it is then!

 

[con1_uk]

Well, seeing as I don’t understand but appreciate your replies, I will leave this one to the experts, or install one that goes off with the light (like for like).

 

[JohnD]

If you have access to the ceiling, for example in a loft above, it will be pretty simple to wire it to the ceiling rose.

 

[con1_uk]

Hi, what about a humidistat extractor? These seem to come on and off automatically so won’t need wiring it to the light?

 

[JohnW2]

Hi, what about a humidistat extractor? These seem to come on and off automatically so won’t need wiring it to the light?

He would still need a permanent 'live', just as he would for a lighting-controlled timer fan, whereas he seemingly currently only has a switched 'live'. The only difference is that for a humidistat-controlled fan he would need only a permanent 'live' (plus neutral), whereas with a timer fan he would need both a permanent 'live' and a switched 'live'.

Hence, if he could find a source for the permanent live, with a humidistat fan he might be able to use the existing 2-core (plus earth) cable, whereas a timer fan would require 3-core (plus earth) cable.

Kind Regards, John

 

[con1_uk]

Hi, would this junction box that serves my 2 shaver plugs (in 2 different bathrooms) provide what I need please?