Electric flex for lighting circuit fan

relicalpha

relicalpha

relicalpha

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Joined
2 Feb 2020
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155
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UK
Hi,

I've just replaced a bathroom extractor in the loft but one of the old cables (switched live) is not quite long enough and I'd like to replace it with a new run. Hopefully I can DIY this... it looks to just be a 1m run from a brown 3-way switch block above the light pull switch.

It looks like standard grey insulated 3 solid core cable from the switch block to the fan, with only neutral/live used as double insulated fan, but I wanted to check what core size I need?

Is something like this ok? Is 1.5mm too much/too little to cover a Manrose 240v/25w fan safely? And sorry for stupid question, the current flex has a red/black/yellow, these all seem brown/blue and often 'freyed' ends rather than solid cores?

Thanks :D
 
Last edited:
0.75mm or 1.0mm flex is fine, it's actually good practice to wire to something that causes vibration using a flexible cable.
 
Yeah don't change cable size... I think you need to derate the cable so do it by the book at least if you're going to DIY it.

Grab some wagos to extend would be my steer, rather than the god awful junction boxes.
 
You could look to keep the original run of cable and wago together the conductors that need extending a bit. That said if it is easy enough to replace the run of cable then you might as well just do that. Worth checking that the fan is on a 6 amp MCB in your consumer unit if you want to be ultra diligent.
 
I mean if we are going to go all out, then it should be protected by a 3amp fused spur that is accessible for isolation purposes when the fan needs to be maintained.

Don't use solid core cable and 0.75mm is absoubly fine but feel free to use 1.0mm if you really feel the need.
 
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