Fusing Fans to manufacturers spec

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nickblake

Well chaps ive been looking at the manufacturer requirements for fusing down fans ,an every one appears to require only the permernant live to be fused so having words with those nice people at scolmore click you can do it easily with the grid range that doesnt actually look like grid fuse and an isolator in the same switch brilliant thats what i say good old Click scholmore GEDC0500.JPG
 
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probably less than a separate isol. and FCU when you factor in 2 back boxes, never mind the extra cutting out and time running cable.
 
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The click stuff is one of the best thought out at the moment.
i like their grid stuff as well.even on normal plates you can swap a 2way for an intermediate easily.
 
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Amp David said:
I get those isolators for about 2 quid, the faceplate for about 90p and a fused unit is around 1.50.

Never thought of doing that and been using the Click mini grid for a while now.

Nice one
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This may sound a silly question but how to you wire it if you're using a fan with an over run timer?
 
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Murdoch said:
This may sound a silly question but how to you wire it if you're using a fan with an over run timer?
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According to the manufacturers instructions i have read you only need to fuse down the permernant feed and not the switch feed , so ideal in my mind ill let you know the cost
 
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nickblake said:
According to the manufacturers instructions i have read you only need to fuse down the permernant feed and not the switch feed , so ideal in my mind ill let you know the cost
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Yep, perm live only on the ones I've seen. I've also noticed that the rule about fusing it only applies to the UK! Anyone know why we're blessed with that requirement here and no one else is?
 
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It is a bit strange, as the whole circuit is protected at 6a. That isolator with integrated fuse on the perm live is a simple but great idea, as said saves the hassle of having to use two accessories. Why does the perm live need fusing down but not the switched live?
 
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kingeri said:
It is a bit strange, as the whole circuit is protected at 6a. That isolator with integrated fuse on the perm live is a simple but great idea, as said saves the hassle of having to use two accessories. Why does the perm live need fusing down but not the switched live?
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They're both fused because of the way it's suggested to be fed (via the perm live). If no other countries need to add protection, then why do we? I don't believe other countries lighting is 3A to start with. I wonder if it's a misunderstanding that has been propogated across the chinese manuf plants.
 
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Not enough 3A fuses were being sold, its a conspiracy I tell ya!!!

If they insist on 3A protection why not just provide them with one installed? Or am I thinking too much?
 
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Strima said:
Not enough 3A fuses were being sold, its a conspiracy I tell ya!!!

If they insist on 3A protection why not just provide them with one installed? Or am I thinking too much?
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If you installed a fuse in the fan then only one of the SL or L would be fused, if you installed two fuses one in each Line then one fuse could go and still leave a live circuit on the fan. You want the fuse before the isolator. As per post #1
 
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but the whole point of the post is that the manufacturers instructions only call for the permanent L to be fused.......is that a mistake on their part?
 
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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.
 
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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.
 
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Strima said:
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.
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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
 
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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?
 
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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:
 
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Strima said:
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:
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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
 
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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.
 
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somersetsparks said:
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.
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suprising isnt it i always put them in well since ive worked for myself
 
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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 !
 
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somersetsparks said:
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.
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Come and look at some of the houses in Dorset then.
 
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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 .
 
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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.
 
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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.
 
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hifly said:
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.
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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.
 
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Fusing Fans to manufacturers spec
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