Fusing Fans to manufacturers spec

nickblake · Jul 8, 2012

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

[ElectriciansForums.net] Fusing Fans to manufacturers spec

Strima · Jul 9, 2012

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?

topquark · Jul 9, 2012

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?

That's the point mate, they don't ask any other country to add a fuse (so it must be OK without that protection?).

telectrix · Jul 9, 2012

so why don't we all bombard manrose and the like with emails asking why?

Richard Burns · Jul 9, 2012

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?

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

telectrix · Jul 9, 2012

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?

Richard Burns · Jul 9, 2012

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

Strima · Jul 9, 2012

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 · Jul 9, 2012

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 · Jul 9, 2012

Like so:

telectrix · Jul 9, 2012

o bugger. just open the bloody window and fart.

nickblake · Jul 9, 2012

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.

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 · Jul 9, 2012

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 · Jul 9, 2012

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 · Jul 9, 2012

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:

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 · Jul 9, 2012

They do look nice and will bear them in mind.

Fusing Fans to manufacturers spec

nickblake

Strima

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topquark

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telectrix

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Richard Burns

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telectrix

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Richard Burns

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Strima

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Richard Burns

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topquark

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telectrix

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nickblake

Octopus

Strima

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nickblake

Strima

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