Supply loft light from unused shower cable

[JE73737]

I was asked a question today if it would be possible to use an existing cable that was previously installed to supply a shower which has been taken out (6mm T+E) to feed a light in the loft. Initially I said no it wasn’t good practice to do this, but now I’m thinking as-long as the MCB is downgraded to 6 amp and the light was switched using a fused spur with 3 amp fuse is there really anything wrong with doing this?

Just looking for some advice on the matter.

Thanks

 

[Andy78]

You could either change the MCB to one that protected the smaller cable that you join to the 6mm, or put in a FCU between the cable sizes to do the same job, but there is no real need to do both.

 

[JE73737]

That’s great I’ll use a fused switch to supply the light.

Thanks for the reply

 

[Pharlo]

if the cable tests out ok just bang an fcu on it and fuse down from there. alternatively pop a two way board up there and good for sockets etc if needed