"disconnected" old immersion heater point gives a reading on fluke tester

[cotty]

like the self portait, cotty.

I must admit, it's one of my best!

 

[jonboy2015]

if you think an old immersion heater feed is adequate for a 8.5kW shower, then i'm afraid you're out of your comfort zone here. thew shower will require a 6mm dedicated radial. if you can't work it out, give me a call.

Many thanks mate, and folks ...including psychic Des56 , for your info and replies, i have wired showers before as a trainee electrician and have used 6mm and when looking at the wiring of this old immersion heater the wiring looked much thicker than the normal 2.5mm t&e and more like that of 6mm so i thought if this was still usable then it may save me running new cable. So it looks like i need to run 6mm from the consumer unit. Just another couple of questions, can i run from CU to a wall mounted switch in a nearby cupboard rather than a pull cord? as i'm dealing with concrete ceilings here. Also i guess a 40A mcb is sufficient with using the 6mm run? Cheers folks

 

[Marvo]

This is turning into requesting step by step instructions which means I'm going to close this thread.

Cable size required depends on the load, the length of cable and the installation method. Every installation is different, you need to refer to the tables in the regs books to work this out. Switch location is also governed by the bathroom zones so agani you'll need to refer to the regs book.