OK, so when I bought the shower, it specced 6mm sq cable.
Sadly, it eats ceiling switches and I now think I need to go up to 10 sq mm.
I shall come out from behind the consumer unit into plastic conduit and run single 10 sq mm cables up the outside wall and in through the soffit.


Questions:


What size earth conductor? They always seem smaller in twin and earth.
Is 25 mm conduit going to be OK?


Any comments?


My reason for doing it like this is that dragging a new 10 sq mm twin and earth right through the house isn't practical.


However...I DO have two 6 sq mm cables, one not used. What's to stop me using both doubled up to produce 12 sq mm?

 

What wattage is the shower unit?

 

9kW

I have TWO 6mm sq cables running from consumer unit to shower, only one is connected.

I cannot get a sensible reply as to why I cannot simply connect the second to the consumer unit and then both into a Henley Block at the shower end, with 10mm sq from there to switch and to shower?

 

to fit a shower in a scooby is one hell of a mod !!!!

 

Nah...sorry, the mods put this in electrics.

 

https://talk.electricianforum.co.uk/

 

Cheers, posted a question

 

And got a response.

 

I noticed, you asked a question, got answers as per here about termination being correct and that the Pull switches should fail if connected correctly, and still chose to double up, add Henley blocks etc . . . . .

 

At least one said parallelling was fine, that a Henley Block in an enclosure would be OK.

The post answers about termination aren't relevant AFAICS, I ALWAYS run the cables sensibly, and ALWAYS tighten, then re-tighten screws.