Discuss Shower, what cable size and braker? in the UK Electrical Forum area at ElectriciansForums.net

It seems that's 8.5kw is in the middle of 6mm and 10mm so I'm stuck there. Also my C/U is in a bit of a state so while I save some money to get it upgraded I was thinking of playing it safe with an RCD UNIT along the way. And the attic is quite clean and space for it to go in there.

What are your thoughts 🤔
You should not be installing an RCD unit 'along the way'. Change your CU for an 18th edition metal clad RCBO SPD protected board, before any other DIY electrics. If you can't do that properly don't electrocute your shower
 
The conductors aren't solid, so it's bigger than 2.5mm
Probably 4mm, the wago 221s will take 6mm.

Still not 10mm, but...

Here's the post with image. While detail is difficult to ascertain, the line conductor certainly appears to be solid. Looking further into this, it's quite clear the connectors are 221-412 from data printed on them, which would accept a maximum of 4mm CSA.

I probably should have added this three weeks ago and saved you some time.

 
Still not 10mm, but...

Here's the post with image. While detail is difficult to ascertain, the line conductor certainly appears to be solid. Looking further into this, it's quite clear the connectors are 221-412 from data printed on them, which would accept a maximum of 4mm CSA.

I probably should have added this three weeks ago and saved you some time.

Conductors don't look solid to me.

And I can't see 221-412 they could be 221-612 which take 6mm


Don't actually know how i got to reply as i was looking at new posts.
 
Conductors don't look solid to me.

And I can't see 221-412 they could be 221-612 which take 6mm

They can not be 221-612 as they're printed with data found on 221-412. If you don't believe me take one of each and compare, but this point isn't up for argument as the image is clear enough to rule out any debate.

If we look back in the other thread it was made clear that the cable in question is supplied from a 16A MCB, from which the outgoing cable has an outer sheath identical in size to that seen on a solid core cable supplying a ring final circuit.

Furthermore, this is a needless distraction from the point that the cable isn't 10mm as OP believed. If you want to argue this further, then start a new thread and don't risk leading someone to believe it's fine to whack a 10.8kW shower on the end of this cable.
 
Last edited:
OP hasn’t replied to either thread since 6th September, where, on the other thread, he has fully accepted the cable won’t take a shower…


If he’s a trainee, I’m sure one of the first things you learn is that sizes are in CSA, cross section AREA, and written in mm SQUARED.
 
Furthermore, this is a needless distraction from the point that the cable isn't 10mm as OP believed. If you want to argue this further, then start a new thread and don't risk leading someone to believe it's fine to whack a 10.8kW shower on the end of this cable.
nobody led them to believe it was 10mm in fact it was the opposite stating that the maximum it could be would have been 6mm
 

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