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Bathroom extractor fan without fuse

Discuss Bathroom extractor fan without fuse in the UK Electrical Forum area at ElectriciansForums.net

I think that the makers put an FCU (with a 3amp fuse) in their diagrams to cater for where the fan is powered from a ring final and the fan and the connecting wiring need to be protected from a fault current limited only by a 32amp MCB.

IMO there is no need to 'fuse down' a fan supplied from a 6amp lighting circuit. There are squillions of them installed like that, everywhere, many of them by me.
 
I think that the makers put an FCU (with a 3amp fuse) in their diagrams to cater for where the fan is powered from a ring final and the fan and the connecting wiring need to be protected from a fault current limited only by a 32amp MCB.

IMO there is no need to 'fuse down' a fan supplied from a 6amp lighting circuit. There are squillions of them installed like that, everywhere, many of them by me.
Totally agree.
 
it's all a matter of discrimination ( or the lack of ). some time ago, i had a vivarium lamp blow. it took out 2 x 5A plug top fuses and the 16A MCB in the CU.
 
Thanks for responses, its going onto existing lighting circuit and will have a 3 pole isolator; I think it would be safe on a 6a rcd'd lighting circuit, however would like to fit it and have no questions from customer if he reads the instructions. Will check out those recommendations !, thanks
 
Some non timed fans ask for 1A fuse, manufacturers requirement takes president so if you installed incorrectly, customer could insist you carry out a costly upgrade to comply at your cost. If you don't tell client you are leaving yourself legally exposed. Is it worth risking your business for a fan?
 
Some non timed fans ask for 1A fuse, manufacturers requirement takes president so if you installed incorrectly, customer could insist you carry out a costly upgrade to comply at your cost. If you don't tell client you are leaving yourself legally exposed. Is it worth risking your business for a fan?
This is true but what are the chances.
 
If it's keeping you awake I'd pop an inline fuseholder inside the fan itself, can't say I'd ever bother myself as like said it's debatable a 3A 1361 fuse would beat a B6 MCB anyway.

Or you could do like barratt homes and stick a sw/f/sp marked "fan" that in fact controls the whole bathroom lights & all and completely miss the whole point of having a fan isolator and causes the likes of me to spend an hour trying to trace a break in a circuit before realising what amateur fwits I'm following around.:mad:
 
If it's keeping you awake I'd pop an inline fuseholder inside the fan itself, can't say I'd ever bother myself as like said it's debatable a 3A 1361 fuse would beat a B6 MCB anyway.

Or you could do like barratt homes and stick a sw/f/sp marked "fan" that in fact controls the whole bathroom lights & all and completely miss the whole point of having a fan isolator and causes the likes of me to spend an hour trying to trace a break in a circuit before realising what amateur fwits I'm following around.:mad:
The point of the fuse is to provide overcurrent protection not fault protection.
 
This came about because some years back a fan caused a fire, and because the contractor had not installed a 3a fuse as per manufacturers instruction he was prosecuted for causing the fire. Nobody stated the bleeding obvious that a 3a fuse would not have made a scrap of difference. This led the NICEIC to advise their contractors to fit the fuse...and to code non fused fans. Bull**** but there you go.
 
Ive been out the loop for10ish years and slowly getting back into it all again because it gives me something to focus on; the non fused fan isolators were familiar, never seen these fused ones until now;
 
I don't get these fused triple-pole switches, they only fuse one of the poles so what is the point. May as well use a standard triple-pole switch with a two gang grid with two fuses fitted. Am I misreading this.
 
Ive been out the loop for10ish years and slowly getting back into it all again because it gives me something to focus on; the non fused fan isolators were familiar, never seen these fused ones until now;
Hi H, you are not alone. Lee's 3 pole fused isolator is one of the many neat things I have learnt here. Cheers
 
I don't get these fused triple-pole switches, they only fuse one of the poles so what is the point. May as well use a standard triple-pole switch with a two gang grid with two fuses fitted. Am I misreading this.
With Tin Hat On, I'm hoping I've got it : the unit has a separate fuse to the 3 pole switch so we can fuse the incoming L and then split it into L for the fan (via 3pole) and send L off to the other half of the new DP light sw, when it comes back it goes into as SL (via the 3pole). Clear as mud ?
 

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