Extractor fan!!!

[Mwoods4757]

Hi just a quick question about extractor fan wiring. I need to come of a Pir to a fcu then to the fan. Do I need a sw or just take l n e to the fcu then to the fan and link out sw and l at the fan. As there is no where for a sw ina fcu?

 

[Plonker 3]

Why not just use a fan isolator?

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[Octopus]

Think hes fusing down!

 

[Plonker 3]

Well fit a spur before PIR.

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[ayjay]

l-n-e out of the fcu to the pir then a twe from the pir to the fan
set the time at the pir
use a non timed fan

 

[nickblake]

What you want is one of these

 

[Plonker 3]

View attachment 15804What you want is one of these

How does that fuse both lives though?

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[sythai]

View attachment 15804What you want is one of these

Click by any chance.....?

 

[Mwoods4757]

Everything had already been wired so there was a circuit for the fan and a lighing circuit. How ever they now want the fan to come on with the lights and not on it's own. So need to include the lighting circuit with the spur.

 

[nickblake]

How does that fuse both lives though?

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you dont have to fuse both most fans state that you have to fuse just the permernant live the reason for this is the electronics on the circuit , with out the permernant feed the transistors do not switch so the switch feed does not pass to the rest of the circuit when applied to the input its basically like having a switch after the switch feed so if the fan fails and blows the fuse the switch feed is then disconnected hence the reason the fuse is not needed , its the fan seizing and catching fire what is the reason the fans have to have a lower rated fuse

yes sythi it is scholmore click

 

[vjsmarwick]

If its yo come in with the lights where does the pir come in to the equation ? And if light circuit is fused at 6 A you don't need to fuse down at all go simply fit a fan isolator which isolates all three wires

 

[jumpin jax]

You will need to fuse the fan down to 3A to meet manufacturers instructions, the pir is the switch for the fan not the lights

 

[MDJ]

I haven't seen many fans fused to 3 amps myself even if it is the right thing to do, the vast majority are wired straight off the bathroom light to a triple pole fan isolator and then back to the fan and work off the bathroom light when energised, unless there is a large window in the room working off the light rather than a PIR would be more realistic for the consumer, if you can add a 3 amp fuse somewhere then go for it, if not I wouldn't worry too much about it myself, but the manufactures may not honour the guarantee if it packs up.

 

[vjsmarwick]

Interesting video on YouTube then about wiring a 4" fan by aspect London maintenance company they must be doing it wrong all the time they don't fuse down either !!!

 

[jumpin jax]

It is just an arse covering exercise to follow manufacturers instructions, so the choice is yours whether you do or not but if one was to catch fire and the fuse was not there then who are the insurance company going to come after? Any excuse these days to pass the blame.