Mixing Shower cable Size

[Darkness]

I am in the middle of putting a new bathroom in and the shower cable needs replacing as its too small.

Accessing the CU to install a new cable is nearly impossible but a number of years ago I had 16mm t&e running from the CU up into the attic which was to be used to power the outside sheds but that will never happen since I got a new supply installed outside.

There is enough run of cable to feed the shower.

My question is whether I could stick with the 16mm or should I use 10mm from the isolator to the shower and if that is the case, is there any issues with regards to mixing 16mm and 10mm together.

I know a lot of people will say 16mm is overkill but the isolator seems to be well designed so wiring 16mm into it shouldn't be an issue.

Cheers

 

[PrenticeBoyofDerry]

I would personally keep with 16mm along the whole circuit.
But there would be nothing electrically unsafe by using 10mm for the remainder, just document this on the certificate.

 

[bernardgreen]

I know a lot of people will say 16mm is overkill

The only "over" is cost, with larger cable the voltage drop is less so less power is wasted as heat in the cable.

 

[Darkness]

Cheers for the replies.

I suppose a downside in using 16mm at the shower would be the connecting of it. It could be awkward and 10mm would be easier.

I'll try 16mm and see how it goes.