how to wire a selv extractor fan

[NadHuh]

Can some one quickly tell me how I can wire a extra low voltage extractor fan, I know it needs a fan, fan isolator, and a transformer but how will the wiring go to each of these. Someone's already done the wiring but its not marked and not making sense so I need to learn how it's wired normally. And if I can remember right there are 2 twin and earths at the light there's 2 twin and earths at where I think the isolator is and there's a twin and earth at the transformer and 1 at the fan.

 

[bsrfc10]

Even being the festive time of year, i cant imagine you getting much help. Get the electrician who wired it to come back and connect it, then TEST it.
Sorry if this is a bit harsh.

 

[NadHuh]

Even being the festive time of year, i cant imagine you getting much help. Get the electrician who wired it to come back and connect it, then TEST it.
Sorry if this is a bit harsh.

The electrician who done this passed away, and I'm a lvl 2 apprentice it's just that I have never done a selv fan before

 

[MDJ]

usually a 2 core to the fan from the tranformer is adequate, you will need a feed, switchwire and neutral at the tranny on the 230 volt side HTH

 

[bsrfc10]

Sorry to hear about the electrician passing, but get another one in to connect and test. Watch, take notes or do the work under their supervision.

 

[telectrix]

wire the transformer as you would wire a 230V fan. then connect the 12V from the tranny to the fan.

 

[Octopus]

Or google the manufacturer and get a copy of the installation instructions - surely you can do that.

 

[LlandrilloSpark]

This is getting silly now

 

[bsrfc10]

it started silly, as most of us have been an apprentice i can't believe for one minute a forum would be the first point of call for help

 

[NadHuh]

Thinking about what people are saying on here this is how I think it will be wired so he got 2 twin and earths at the light because from one of them his going to get the s wire and perm live and from the other one his just going to use the neutral these 3 will go to a double pole isolator and from there it will go to a transformer and then from there to the fan, but what I don't get is why he needed the permanent live?

 

[MDJ]

some selv fans need 3 cores, most just have 2, perhaps he knew the make of the fan he intended to install, give the guy some credit, althought the wiring sounds confusing to me, why 2 twins? why not a 6243y?

 

[NadHuh]

some selv fans need 3 cores, most just have 2, perhaps he knew the make of the fan he intended to install, give the guy some credit, althought the wiring sounds confusing to me, why 2 twins? why not a 6243y?

I think twin and earth was all he had on him and couldn't be bothered to get some 3 core.

 

[NadHuh]

So I found out that the perm live is needed because when you turn your bathroom light off there is no power in the s live and the timer fans still carry on running that is when there using the perm live, can't believe no one could answer this for me on here.

 

[LlandrilloSpark]

Give us a break, thus forum is for Electricians, or trainees, you sir are neither

 

[chrish_1977]

Even a level two apprentice should be able to wire a fan whether its lv or not, sounds like a question from one of mine