Wiring a bathroom extractor fan

[chuckstre77]

Hi all, Im sure this question has been asked before but i cant find a definitive answer.

I am installing a new timed extractor fan in the bathroom.
I want to spur off the light switch to a fused switch for the fan.
The bathroom light switch doesnt have a neutral, so where would i get the neutral from?
Could i buy a single core & earth cable and chop into a cable that comes from the bathroom light in the loft then reconnect the live wire with a double wago connector and then reconnect the neutral wire & earth wire (seperately) using triple wago connector join the new single core & earth cable and run that down to the supply side of the switch?

Hope that makes sense.

 

[Harry Bloomfield]

The bathroom light switch doesnt have a neutral, so where would i get the neutral from?

Your bathroom light will certainly have a neutral, and a switched live - it might also have a permanent live.

The switch might also have a neutral, it will certainly have a permanent live, and a switched live/switch wire.

You timer fan, will need a neutral, switch wire, and permanent live.

 

[chuckstre77]

Yeah, i have installed the fan & ran the cable back to the fused switch. It does indeed have neutral, switch wire, and permanent live.

I need to connect the fused switch to the light switch which has permanent live & switched live but no neutral.

So I suppose my question is can i take the neutral from the cable/ceiling rose in the loft and run it back to the supply side of the fused switch.
Although im not sure i can get to the ceiling rose from the loft due to there being a false ceiling, thats why i mentioned chopping into the cable.

 

[Harry Bloomfield]

So I suppose my question is can i take the neutral from the cable/ceiling rose in the loft and run it back to the supply side of the fused switch.

Wherever you get the neutral from, then it must be taken from a neutral of the same circuit as you have sourced the live, and switched live. Likely that will be the case, if all your upstairs lighting is on one circuit.

 

[pete01]

As Harry said the light may have everything you need, so might the switch.

 

[chuckstre77]

Yep, all upstairs lights are on the same circuit.
It appears I’m good to go. Thanks for the swift replies. If it goes t*ts up I’ll be back.

 

[Murdochcat]

Why have you installed a fused switch ?

 

[chuckstre77]

Cos that’s what the instructions said to install

 

[Taylortwocities]

Cos that’s what the instructions said to install

They aren't always right. Your light circuit will be protected by a 6amp MCB. That is going to trip a long time before a fuse in the "fused switch" blows. So having a fuse is pointless.
I guess you have installed a triple pole fan isolator switch too?

 

[chuckstre77]

well, it said douple pole fused spur, so i bought one with a switch so i could turn the fan off if the timer function wasnt needed at times like the middle of the night when the wife goes for a pee about 20 times

 

[Taylortwocities]

I guess you have installed a triple pole fan isolator switch too?

Didn't the instructions say to install one of those?

 

[chuckstre77]

see above - it was a double pole fused spur the instrucitons said to install

 

[Taylortwocities]

see above - it was a double pole fused spur the instrucitons said to install

I did see above. Most instructions say that you should (not must) install two switches. the not needed fused switch, which we have discussed, and a 3-pole fan isolator switch.
Like this

 

[Murdochcat]

Never install isolation switches for extractor fans in rental properties

 

[chuckstre77]

https://www.manrose.co.uk/wp-content/uploads/doc/FandWs/077645.pdf

@Taylortwocities Instructions say nothing about an isolator switch too, but i suppose with installing the switched fused spur i have the isolator there.


@Murdochcat - this is my own home, its not let