On 04/10/2012 09:16, Mark BR wrote:

Can I use 'bell wire' for a room thermostat for the combi boiler, or is it
under-rated for that job?

In terms of current carrying capacity, it is probably adequate, however
it is not well enough insulated to carry mains voltage.

The exception to this may be if the combi has a 24V option for controls.


--
Cheers,

John.

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