Using CPC as live conductor.... ok i know, but...

[uksparks]

Hi,

Had to change a bathroom fan at the weekend for someone and they wanted it to be on a timer, but couldnt as the cable was buried in the wall and wouldn't move etc..

the cable that fed it was a three core flex, I the earth was not being used anyway due to the load on the end etc.

I know you are not meant to use the CPC as a live conductor, but if its flex and the same CSA and you were to correctly identify it with brown etc, would it have then been acceptable?

I didn't do it, but it made me think, oh i so could have used it, but it just seemed wrong. I can understand why you wouldn't do it in twin and earth, but surely where its flex or all conductors are the same CSA and have their own sheathing on them inside the outer, would it have been acceptable or not?

I am going to say not on the basis CPC is CPC and nothing else, any thoughts would been welcomed.

 

[telectrix]

why not just wire the fan in 2 core from the bloody shower switch? :ban:

 

[Silly Sausage]

I just need a cold bath after all this.

 

[Hawkmoon]

Must admit, I've done it.....but it was on 400w sons 30 ft in the air, before we had internal photcells. The photocells had to be fitted to the brackets with 3 core flex from the fitting, about a foot long.

Shoot me for that you word for worders.......NIC ban on the way, no doubt!!!:cowboy:

Agreed - Following a reasoned risk assessment, why not do it?

 

[jackhammerJIM]

why not just wire the fan in 2 core from the bloody shower switch? :ban:

great suggestion TEL . mount timing module in shower

 

[R G]

great suggestion TEL . mount timing module in shower

Just sit it on top of the shower and clip some single up the wall over the ceiling to the fan , jobs a goodun.

 

[GLENNSPARK]

Thats not like you GLENN

no..i know.

just thought it`d make a change..

 

[GLENNSPARK]

here have a looky

yeah but honestly Mike...if someone cant wire up a bloody fan...:nonod:

 

[uksparks]

I think I have not made myself clear, the fan is mounted in the wall and tiles in as it the wire, I changed the fan, but cannot replace the wire to it, this is the problem. Short of ripping tiles of the wall I cannot change the wire, its a non starter.

This is why I was wondering about using the CPC...

 

[Plonker 3]

Can you get access too the cable I'm the ceiling so you could mount a SELV fan a MDJ suggested?

 

[R G]

I think I have not made myself clear, the fan is mounted in the wall and tiles in as it the wire, I changed the fan, but cannot replace the wire to it, this is the problem. Short of ripping tiles of the wall I cannot change the wire, its a non starter.

This is why I was wondering about using the CPC...

Why not take the timer module out of the fan and put it in an enclosure in the loft and use the LNE down from the timer module

 

[silver surfer]

I think I have not made myself clear, the fan is mounted in the wall and tiles in as it the wire, I changed the fan, but cannot replace the wire to it, this is the problem. Short of ripping tiles of the wall I cannot change the wire, its a non starter.

This is why I was wondering about using the CPC...

In principle reg 514.4.2 allows us to over sleeve a core, coloured green and yellow, of a multicore cable at both ends to be used as a live conductor as long as it is the same CSA as the other live conductors within the cable.
but the chances are that the circuit feeding your extract fan does not comply with 411.3.1.1

 

[uksparks]

Flipping heck, the fan is in the wall, the wire goes down the wall then into a vanity unit thing with a light on it with its own pull cord, when you pull the cord the light and fan comes on. It goes nowhere near the ceiling. There's no transformer, it's 230v bot ELV, the cable to the fan fel. The vanity unit thing is buried behind the tiles and is three core flex.

theres nothing I can do with it other than pull tiles off the wall.

 

[Plonker 3]

Ok , right, your judgement. Theres a departures box on a EIC maybe you could utilise that?

 

[R G]

So the circuit is all in the wall then and spurred from the vanity unit , is that what your saying , also the pull cord brings on the fan and vanity unit together is that right ,,

 

[Risteard]

here have a looky

But how can SELV (which is separated from Earth) have a neutral conductor?