extractor fan price,please help

[La Poste]

why! that just been a perfectionist! lol

It's just a fan question really.
Does the fan draw its current for operating from the main feed and the switched feed from the light just act as a trigger?
Does the switched feed from the light have no involvement in the running of the fan other than trigger it on?

 

[malcolmsanford]

Haven't done a fan in a kitchen for a few years now so forgive me if things have change any.

Normally a kitchen fan will have a LINE/NEUTRAL and if it's class 1 an EARTH class II then no earth connected to it. As it will not have a timer that is all you need, but obviously you will need a switch to turn it on and off. Normally that is a switched FCU somewhere in the circuit, as the chances are you have picked a feed up from a local ring final circuit. If you have picked your LINE/NEUTRAL from a lighting circuit or a dedicated circuit from a CU then you most likely fit a switch. Depending on the manufacterers instructions that can be either a single or double pole.

In a bathroom it is slightly different as quite a few fans have timers. That means after the fan is isolated, and this is normally from the bathroom light switch, the fan will run on for perhaps 10 minutes, this is to allow the unit to change the air in the room. Theses type of fans require SWITCH LINE/NEUTRAL for the activation and a permanent LINE for the timer. Again EARTH for class I and II. Some fans also incorporate a humidistat that is normally wired in series with the SWITCH LINE to act basically like a thermostat.

 

[dixon9]

also are you going to fuse down to manufactors instructions i always fit airflow icon fans and require 3 amp fusing down

I´m glad I´m not the only one. I got the impression hardly anybody bothered - just stuck the 3 pole iso up and bobs yer uncle!

I get funny looks when I explain why I have fused down!

I spoke to icon asking them if they could suggest a supplier that might have an isolator WITH a 3 amp fuse....alas no....so I put a 3 amp non-sw spur up alongside the isolator.

 

[dixon9]

Is it placed in line with the permanent live or the switched live from the light switch or both?
Does the fan draw its current from the permanent live and the switched live just act as a trigger?
I'm guessing the fuse is put in line with the permanent live to the fan.
Apologies if my question is a little obvious.
Cheers.

Icon have the fuse in line with the perm live in their fitting instructions. Given that the perm live is where the constant current flow occurs this makes sense.