bathroom Fan

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Hi Guys, I'm new to this site, so be gentle with me.lol
Question, I would like to fit an electrical ceiling fan in the bathroom, there is a shower in there but it is a thermostatic one that runs of the combi. Can I run a 1.5 t/e from the mcb to a pull switch in the bathroom and then to the fan. Any advise would be welcome.....Thanks Bill
 
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There certain legal requirements concerning electrical installation within bathrooms that you should be aware of take a look here.
//www.diynot.com/wiki/electrics:part_p
Ideally you want the fan to work on an overrun, this can be linked up to the light in the bathroom using three core and earth, plus an isolator will be needed, which will normally be located outside the bathroom.

//www.diynot.com/wiki/electrics:lighting:fan

You will also need to calculate the room size for the correct sized fan needed.
http://www.tlc-direct.co.uk/Technical/Ventilation/Ventilation4.html
 
Thanks for the reply, I dont want the fan to come on with the lights, I want it switched separately. As I understood i thought that you would only need an out side isolater if it was a electric shower, which this is not. I'm bringing the 1.5 cable from the fuse bored which is a 6amp trip switch to the pull cored and then to the fan. Or do I still need an isolater out side the bathroom?.
 
Thanks for the reply, I dont want the fan to come on with the lights, I want it switched separately. As I understood i thought that you would only need an out side isolater if it was a electric shower, which this is not.
It's not the electric shower that is the issue its the water vapour produced.
I'm bringing the 1.5 cable from the fuse bored which is a 6amp trip switch to the pull cored and then to the fan. Or do I still need an isolater out side the bathroom?.
What about your RCD and notification issues?
Pull cord isolator can go in the bathroom.
 
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Usually a bathroom fan gets it's supply from the lighting circuit, rather than going back to the consumer unit.

By getting the feed from the lighting circuit doesn't necessarily mean the fan has to come on with the light.

If there is an opening window the fan can come on by it's own (pull) switch.
 
Thanks for the reply sparkwright, I did have it spured of the shower switch going through a 5 amp fuse box so it only came on when we used the shower. Since then the electric shower got that furred up with lime scale that i took it out and put a thermostatic shower in, instead of another electric one. I could bring it of the lighting circuit and so it is switch seperate. but I would rather bring it of its own power supply, mainly because i have a spair 6amp rcd in the fuse bored. Question is, do i need an isolating switch out side the bathroom as well as a pullcored switch, or can i just have a pullcored in the bathroom... Sorry its long winded.lol
 
most manufacturers of fans will stipulate that they are protected by a 3 Amp fuse, so the answer is yes, fit a fused spur, in series, before the pull cord switch.

But as stated there are notification issues here
 
Thanks for the help, much appreciated. It was just a query that's all. I'd fitted a new consumer unit a few months ago. Had a qualified electrician in to pass it off when he noticed how I'd got the fan and shower hooked up. He said it can't be done like that and that it should have its own supply from the c.u.
 
I think either you may have misunderstood your electricians point or, he/she is looking for unneccesary work. the fan can be run off a local lighting circuit whether you want it switched with the light or via a pull cord
 
If you do not require the fan and light on at same time, you can still use the lighting circuit as a power supply. The way the fan is connected will depend on the manufacture instruction that will be issued with the appliance you buy, the ask for 3A protection they may not. But a 3A Switched FCU can be used as your isolator and connected through a pull coed.
But it must have RCD protection, so if no RCD protection on lights the use of a RCD protected fused spur would be advisable.
 
I'd fitted a new consumer unit a few months ago.
How much guesswork and luck did that involve?


Had a qualified electrician in to pass it off
What an apposite term.... :LOL:


when he noticed how I'd got the fan and shower hooked up. He said it can't be done like that and that it should have its own supply from the c.u.
I suspect what he meant was that you shouldn't have taken a feed from the shower switch to the FCU, because I suspect you didn't use the same size cable as the shower supply for that...
 
I ran a 10mm cable from the shower switch to a spurbox with a 5 amp fuse, from that I used 1.5 T/E from the spurbox to a pull switch to the ceiling fan.
 

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