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Topic Title: Bathroom fan
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Created On: 04 December 2012 05:04 PM
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 04 December 2012 05:04 PM
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daveparry1

Posts: 5888
Joined: 04 July 2007

Hi all,
I know we've covered this subject many times before! I have to replace a bathroom fan for someone, there's no fcu in place but as is usual the replacement fan (Manrose humidistat model) instructions say a switched fcu must be fitted. I'm thinking of just wiring the permanent live through a switched fcu, alternatively as it's a like for like replacement I could just replace it and forget about the fcu. Re-wiring to get the switched live through the fcu is not an option as it's in an 80's built flat with all wiring in conduit in the concrete ceiling, I suppose two fcu's would be one way of doing it but that seems a bit ott!

Dave.
 04 December 2012 07:22 PM
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primo

Posts: 426
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this may be of limited help, maybe add another fuse module in?

http://www.scolmore.com/articl..._Ventilation_Equipment
 04 December 2012 07:29 PM
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daveparry1

Posts: 5888
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That looks interesting Primo, won't be able to use one on this job as i'm doing it tomorrow but definitely will keep it in mind for future jobs,

Dave.
 04 December 2012 07:40 PM
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mossep

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Greenwood fans state that a 6A MCB is fine, not FCU required.

-------------------------
www.mossep.com
 04 December 2012 07:46 PM
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daveparry1

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I have used those before mossep, i'll be using them in future to save all this fcu business,

Dave.
 04 December 2012 07:52 PM
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daveparry1

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I've decided as it's a humidistat model to fit an fcu but only connect the permanent live, no need for it to be activated by the light switch, it will come on when it's needed by the humidity in the room,

Dave.
 04 December 2012 08:28 PM
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DOUGIE1000

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Originally posted by: mossep

Greenwood fans state that a 6A MCB is fine, not FCU required.


just looked at a fan for greenbrook instruction manual online, says 3amp, mind you it did say not to be installed any zones.

I currently use manrose but once our stock is gone we will be changing to a supplier that says 6amps, anyone recommend a 4inch fan with timer that does just that?

-------------------------
Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 04 December 2012 09:04 PM
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mossep

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Look at greenwood fans, not greenbrook

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www.mossep.com
 04 December 2012 09:14 PM
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leckie

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Vortice also say 6a mcb ok if fan supplied from a lighting circuit.
Use greenwood or Vortice and avoid all the 3a fuse nuisance
 04 December 2012 09:17 PM
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leckie

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I can also tell you that I have fitted literally hundreds of greenwood fan and never had a failure. The most reliable fans I have ever fitted
 04 December 2012 09:18 PM
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DOUGIE1000

Posts: 4113
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Originally posted by: mossep

Look at greenwood fans, not greenbrook


haha ok my error, what a doosh

-------------------------
Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 04 December 2012 09:30 PM
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daveparry1

Posts: 5888
Joined: 04 July 2007

So just so that I can get this job out of the way in the morning how about my plan to just connect the permanent live through an fcu? No need for it to come on with the light as it's got humidity control is there?

Dave.
 04 December 2012 09:42 PM
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leckie

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Edit
Don't fit a fan requiring a 3a fuse. Fit greenwood or vortice. Put the manrose into stock or return it. Fit a tp isolator next to the fan for local isolation if you want. Or fit a spur and don't connect the sw l if you need to use the fan as you have said
 04 December 2012 09:46 PM
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daveparry1

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Thanks Leckie, I do need to get this job done early in the morning as it's been arranged with the occupiers for some while so i'll use the Manrose and just connect the permanent live in this case. However I will avoid Manrose in the future,

Dave.

Edited: 04 December 2012 at 11:01 PM by daveparry1
 05 December 2012 03:15 PM
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daveparry1

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Done the job this morning, put a switched fcu in a cupboard in the bathroom and just connected the permanent live. Explained it to the customer who was very pleased with the arrangement as she said she didn't want the fan starting every time they put the bathroom light on. I am wondering why no one makes a three pole fan isolator incorporating two fuses, that would solve a lot of problems wouldn't it. I will definitely stay clear of Manrose in future, bit of a nuisance though as they are the ones stocked by my local supplier,

Dave.
 05 December 2012 03:20 PM
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AJJewsbury

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I am wondering why no one makes a three pole fan isolator incorporating two fuses, that would solve a lot of problems wouldn't it.

probably because the arrangement wouldn't comply with BS 7671.
- Andy.
 05 December 2012 03:24 PM
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OMS

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Originally posted by: AJJewsbury

I am wondering why no one makes a three pole fan isolator incorporating two fuses, that would solve a lot of problems wouldn't it.


probably because the arrangement wouldn't comply with BS 7671.

- Andy.


LoL - two circuits, by definition, with an in built shared neutral in the design -

OMS

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Failure is always an option
 05 December 2012 03:31 PM
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daveparry1

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I can't see that OMS, aren't we often saying that a circuit starts at the c/unit?

Dave.
 05 December 2012 03:36 PM
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AJJewsbury

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I can't see that OMS, aren't we often saying that a circuit starts at the c/unit?

The BS 7671 definition effectively says one starts at each overcurrent protective device (p24).
- Andy.
 05 December 2012 03:55 PM
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daveparry1

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I think i'd be calling this "professional judgement" Andy. The supply would be coming from one mcb in the c/unit and the only places these two "circuits" would be is whithin the three pole isolator and the cable connecting the isolator to the fan. It's not as though the two circuiuts are supplying different pieces of equipment is it. I suppose this is all hypothetical anyway if no one makes a three pole isolator with two fuses!
Not arguing with what you're saying Andy, it's just the way I see it,

Dave.
IET » Wiring and the regulations » Bathroom fan

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