Wiring in a bathroom extractor fan – advice
We need a ceiling bathroom extractor fan. That needs electricity. The fan will be in the attic with a string pull into the bathroom.
Do I have to find the upstairs ring main and run a spur from that or can I run it from the upstairs lighting circuit.
The lighting circuit is easily accessible. The ring main will need finding.Posted 6 years agomartinhutchSubscriber
Be careful choosing your fan. A lot will have a run-on feature where the fan stays on after you switch the light off. I seem to recall the one I bought then required a separate always on live to make it work, and I had to improvise around with it to sort this out.
Can you still get ones with separate pull cord? That would sort your chilly bathtime problem.Posted 6 years agoteefMember
I’d have it on a separate switch as you don’t want it running every time you go into the bathroom. If it’s got a delayed timer mechanism you’ll need a way of telling whether it’s on or off – I used a shower isolator switch with a LED but I think you can get fans with LEDS.Posted 6 years agoRubber_BuccaneerSubscriber
I had all of mine wired up by an electrician. As the rewire was done together with building a new extension everything was under current rules. The extractors are wired into the lighting circuit and come on with the bathroom lights. In each case the extractor has an isolation switch so it can be switched off without having to turn the lights off. In my case the isolation switches are in the loft but there is no reason why you can’t have a second pull cord in the bathroom, in fact I think it is quite common to do this.
You may not want to turn the extractor off while you are in the bath though, the idea is they remove damp air and that does help keep your mirrors clear of steam and, if you are that kind of guy, the extractor helps remove any gas if you blow a few bubbles in the bath 🙂Posted 6 years agoRubber_BuccaneerSubscriber
of course you don’t have building control to worry about so have the extractor operating how you like, independent of the lights if you so wish.
Short answer was you should be fine to use the lighting circuit for what you intend to do. Have your electrician check the instructions for the extractor unit though.Posted 6 years agocrankboyMember
i did this job myself and was very scared
lesson one there is an extra wire an orange or yellow one
lesson two this is part of the light circuit
lesson three this is live even if the light is off!!!!
having learned that the i was able to swap our existing pull switch fan for a humidity sensitive one , our fan now comes on automatically with the light and goes off after a minute or comes on when the humidity ie steam in the bathroom reaches a certain level(adjustable)
having done it once I’d pay to get it done in future working out which was which wire in the light socket was areal pain as our house is very old and has been through the hands of a number of DIY hobbyists of varying incompetence.Posted 6 years ago
I studied as an electrician – wouldn’t let most of the others in my class anywhere near my electric
I trust my electrician – find a recommended one and it’s the best option imho.
It’s a small price (for me) to pay to know I’m not going to get electrocuted/burn the house down.Posted 6 years agoprojectMember
ENSURE THE POWER IS OFF, i was fitting a new t and g ceiling in an old house, asked the chap to switch the power off, he said he had, i checked the lights and they didnt come on, so removed the ceiling rose, 2 wires hanging from ceiling in far corner, which i didnt notice till i got to far corner, pushed them aside with the hammer, and huge bang and flash, he hadnyt turned off the power for the fan, which was on another circuit, just the lights, which where marked lights on the circuit board.
I resisted the temptration to drop the hammer through his bog.Posted 6 years agoTreksterSubscriber
Edit – I usually check at the work end too – perhaps I am a bit paranoid.
Nope. Standard practice. Test before touch we call it. Use a meter to test after isolating and before touching rather than a hammer ^^^ 😉
And this 😉
FeeFoo – Member
Being equally paranoid, I was thinking I could go one step further and have a complete “lock-off” station fitted.
`tis what I have to do at work btw. The key then gets put in a lockbox and a permit to work issued 🙄Posted 6 years ago
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