Shower cable.

[nobbygang]

Hi there, 1st time posting for me. I am replacing an existing 7kw electic shower with a 9.8kw electric one. Currently there is a 6mm core cable from the fuse box to the shower with a run of about six metres. Do I need to upgrade the cable to a larger one. Obviously it is easier not to, but would rather get it right

Thanks for any help.

 

[davelx]

Where and how is the cable run (clipped direct, in conduit, under insulation, in plaster etc)? What rating is the MCB on the circuit?

 

[nobbygang]

The cable runs under the floorboards until it has to pass through an 18" stone wall. From there the cable will be clipped up the wall behind a tiled panel to the on/off housing. It currently has a 30amp fuse in the box.

Hope that is helpful.

 

[BigJon]

You will need to upgrade the cable o 10mm and your fuse with a 40A.
going by your 30A fuse size i presume you have the older "pull out" type fuses rather than the more modern MCB's?
I'd be wanting to fit a 30ma RCD or RCBO on this shower circuit so you may have to add an extra enclosure to accommodate an RCD if your existing installation isnt compatable.

 

[nobbygang]

Thanks for the advice. You are right, I do have the older pull out fuse. I will definitely renew the cable and fuse.

Many thanks.

 

[Adam_151]

If your board has a 60A main switch, it will not be designed to take an individual fuse in excess of 30A