Thermostat wiring cable size

[dtokez]

Hi all, I need to fit a thermostat to my fairly old boiler.

It uses a mains powered stat, so I need to run live, neutral, earth and switch wire to my stat.

Can I use 1.5m 3 core + earth or does it have to be 2.5mm 3 core + earth?

The boiler says it needs a 3 amp spur for power so there won't be more than that running through the stat?

Cheers

 

[mysteryman]

0.5mm or 1mm should be enough. 2.5 is gross overkill.

 

[MJN]

I haven't seen 0.5mm 3C+E before (that's not to say it doesn't exist though) but both 1mm and 1.5mm would both be acceptable from a current carrying perspective.

Mathew

 

[dtokez]

Thanks, I didn't know if it was regs or something

 

[Dan Robinson]

0.75mm Heat resistant is what's required.