Fusing Fans to manufacturers spec

[Richard Burns]

No the instructions ask for the permanent line to be fused before the split to permanent and switched so not at the fan.

 

[Strima]

I can see both sides for the fusing of both lines. Was the fuse brought in due to motors burning out and causing fires? If that's the case then only the perm L needs fusing as the SL is only a signal to the PCB as any fault should cause overload on the perm L. Or is my logic way out? Ideally what is needed is a three pole fused switch.

 

[Richard Burns]

Engage brain and read thread before posting!! I see what you say about the permanent line fusing I hadn't actually thought about the arrangement above and now realise it is only fusing one part of the circuit and not the whole lot.
Sorry.

 

[topquark]

Like so:

 

[telectrix]

o bugger. just open the bloody window and fart.

 

[nickblake]

I can see both sides for the fusing of both lines. Was the fuse brought in due to motors burning out and causing fires? If that's the case then only the perm L needs fusing as the SL is only a signal to the PCB as any fault should cause overload on the perm L. Or is my logic way out? Ideally what is needed is a three pole fused switch.

Exactly the reason , there were a spate of fire including one hotel in london where some people died as a resault the electrician was prossecuted and if im not mistaken charged with unlawfull killing due to the fact that he had not followed manufacturers instructions

 

[Octopus]

What I've noticed is that on the last 2 fans I've installed not only do they both call for 3A fuses but they also state that "isolation" is also required - so even if the doubters here say they aren't going to bother with 3A fuses will they bother with isolators too?

 

[Strima]

Always stick an isolator in when doing a new fan, makes it easier for testing and working on and fans annoy me when I go for a gush at three in the morning and it wants to runs on for twenty minutes hence I give the customer the option of where they want it... :lol:

 

[nickblake]

Always stick an isolator in when doing a new fan, makes it easier for testing and working on and fans annoy me when I go for a gush at three in the morning and it wants to runs on for twenty minutes hence I give the customer the option of where they want it... :lol:

i have 2 fan isolators to install i will now be using the click fuse with isolators for those intrested in the isolators in the pick order codes for the parts are MD020WH fan isolator MD220WH locable version MD047PW fuse module and PRW403 for the face plate these also come in a full range silver brass chrome etc blimby i sound like an advert lol

 

[Strima]

They do look nice and will bear them in mind.

 

[somersetsparks]

I believe only the permanent live needs fusing as the switch live just 'switches' the actual fan motor only ever runs off of the permanent live. They don't really care about the fuse blowing and leaving a permanent feed at the fan.
Saying that though, I have yet to see a fused fan in a house.

 

[nickblake]

I believe only the permanent live needs fusing as the switch live just 'switches' the actual fan motor only ever runs off of the permanent live. They don't really care about the fuse blowing and leaving a permanent feed at the fan.
Saying that though, I have yet to see a fused fan in a house.

suprising isnt it i always put them in well since ive worked for myself

 

[somersetsparks]

Indeed, even stranger that they only have to have them in the uk, I think it may be a misinterpretation by the manufacturers somewhere along the line, lazy b*ggers should just put a little 1361 carrier in the fan itself !

 

[Doomed]

I believe only the permanent live needs fusing as the switch live just 'switches' the actual fan motor only ever runs off of the permanent live. They don't really care about the fuse blowing and leaving a permanent feed at the fan.
Saying that though, I have yet to see a fused fan in a house.

Come and look at some of the houses in Dorset then.

 

[somersetsparks]

Come and look at some of the houses in Dorset then.

Might well do, not to far from somerset, see thing is there a bit posher over your way!

 

[Guest111]

Looking at fig 4 on that drawing it appears to be based on a seperate switch for the fan as you have L and N coming in with a fuse in the live then it splits and a perm live goes to fan and one goes through the switch,obviously someone has very little knowledge of how fans are wired over here i.e switched with light.typical manufacturer type of thing really .

 

[kingeri]

Sorry to re-open this one, but just wanted to confirm something. I've always believed that when the instructions state that only the perm line needs fusing at 3amps, then this means at the fan, hence the switched line is not fused. To fuse it to encompass both with one fuse would surely mean fusing the bathroom lights at 3amps as well. Seeing as the click accessory has only one fuse, I take it I am correct in assuming that perm live is referring only to the actual perm live feed to the fan? Sorry to be a bore.

 

[Deleted member 19807]

could someone let me know which makes of timed fan only require the perm Line to be fused as all the ones i fit are the same as in post 24 that shows both perm and switched needing fusing. Would be nice to not have to put the light on the fuse as well.

 

[yellowvanman]

could someone let me know which makes of timed fan only require the perm Line to be fused as all the ones i fit are the same as in post 24 that shows both perm and switched needing fusing. Would be nice to not have to put the light on the fuse as well.

Try making the fan work with just the switched live and neutral!

I assume the perm line actually feeds the motor etc. and makes the switched live useless if not present.

 

[Deleted member 19807]

Try making the fan work with just the switched live and neutral!

I assume the perm line actually feeds the motor etc. and makes the switched live useless if not present.

that won't work with a timed fan, you need both perm and switched.