Fitting an extractor fan in a bathroom

[Need Help21]

People,

I intend fitting a new extractor fan in my bathroom. It will probably be fitted in the ceiling with ducting taking it outside.

Can someone please provide guidance on how extractors are wired (i.e are they on a timer etc and what circuit are they fed from).

If possible a solution for wiring it where the work is not notifiable would be preferable. My house is currently completely signed off.

Thanks




Need Help21

 

[ColJack]

the way it's wired depends on your choice of fan.
you can get them with over-run timers or not..
you can also get humidity controlled ones and PIR controlled ones.

the non-timer ones just need a switched live and neutral ( and earth maybe depending on whether it's class II or not.. ).
these are normally taken from the light in the room as it's the most convenient place to get a switched live and neutral from.

if it's a timer one, then it needs a permanent live in addition to the switched live and neutral ( and earth )..
again this is normally taken from the light, but depending on your wiring method you may not have a permanent live at the light.. many new houses are wired as "loop in at switch" where the live feeds are taken to the switches and only the switched live and neutral taken to the light.
if your house is wired like this there will be only one cable in the light.
In this case you can take the fan wiring to the switch as the needed connections will be in there.


View media item 13602A ceiling rose in new colours..
( for old colours, substitute red for brown, and black for blue..)

the lamp would connect to 1 and 8..
to connect a fan without a timer, you take a live from 3, 4 or 5, and a neutral from 6 or 7 using T+E cable. ( + earth from the earth terminal. )

for a fan WITH a timer, you do as above, but take a switched live from 2 as well, and you use 3C+E cable..

there should be a fan isolator switch near the fan for maintainence.