Fusing Down Extract Fan To 3A

[Noob2013]

Hi all,

Most manufacturers state that their extract fans need to be fused down to 3A.

I don't know many sparks that actually do this, however I did on my last one.

I'm looking at doing this again but a different method.

Has anyone ever fitted an in - line fuse holder with a 3A fuse in the box with the fan isolator? Saves fitting a FCU.

The other method I'm toying with is a grid plate with fan isolator and 2 fuse holders (perm and switch).

Opinions please.

Thanks

 

[mhar]

This is a reply I gave on a previous thread :-
In reply to the op it is possible to achieve fan isolation of all lives, fusing of both lines and have the bathroom light unaffected by fan isolation using just a dp sfcu and a dp light switch. The wiring is a bit 'busy'.
Supply into dp switch, two x two core cables to sfcu and one x three core from sfcu to fan. Connect as follows :- Supply l to dp light sw S1, n to wago in light sw back box. Using one of the two cores cables, light sw S1 to sfcu l supply, sfcu l load back to light sw S2. Second two core, light sw L2 to wago in sfcu back box, n from light sw wago to sfcu supply n. 3 core is connected to sfcu l load, sfcu n load and switched line to sfcu wago. The light is connected to dp light sw L1 and n to light sw n wago.
Description looks confusing but draw it out.

 

[mhar]

Vent-axia

Have a read of this. http://www.vent-axia.com/files/pdf-downloads/438680.pdf 1A fuse required!!!

 

[Leesparkykent]

Have a read of this. http://www.vent-axia.com/files/pdf-downloads/438680.pdf 1A fuse required!!!

Link doesn't work...If I remember correct the vent-axia silhouette fan has a diagram showing it fed of a lighting circuit with no 3A fuse.

edit: found diagram

 

[Deleted member 9648]

Well hang your head in shame fella......such things are classed as LSC's and are not to be used for any other purpose,dont have the BYB to hand but 559.6.1.4 applies I believe.

Edit....559.5.1.203 in the BYB !

 

[Richard Burns]

This is a reply I gave on a previous thread :-
In reply to the op it is possible to achieve fan isolation of all lives, fusing of both lines and have the bathroom light unaffected by fan isolation using just a dp sfcu and a dp light switch. The wiring is a bit 'busy'.
Supply into dp switch, two x two core cables to sfcu and one x three core from sfcu to fan. Connect as follows :- Supply l to dp light sw S1, n to wago in light sw back box. Using one of the two cores cables, light sw S1 to sfcu l supply, sfcu l load back to light sw S2. Second two core, light sw L2 to wago in sfcu back box, n from light sw wago to sfcu supply n. 3 core is connected to sfcu l load, sfcu n load and switched line to sfcu wago. The light is connected to dp light sw L1 and n to light sw n wago.
Description looks confusing but draw it out.

Like this?

 

[uksparks]

Yes that makes sense, the only thing is if you wanted to do it from a pull cord you would need to use a double pole one not just your ordinary type.

im just thinking about this layout as have a couple of extensions I'm working on so might just reconfigure it slightly to work this way.

i know it's obvious in a way but thanks for sharing it.

 

[uksparks]

*** deleted

 

[dnjr]

Don't think the environvent silent 100 needs a fuse Worth a look it's a reasonable fan

 

[marc8]

we fit 3amp circuit breakers for bathrooms normally get 2 from one, this helps split lighting circuit up also, if we have multiple bathrooms en-suites utilities ect then we grid switch from 6-10amp circuit breakers.