In an earlier contribution to this discussion,
Dave Plowman (News) wrote:

In article ,
Louise Campos wrote:
My Dad is installing a Danfoss RMT 240 volt room thermostat to
control a Danfoss HS3-3 point mid-position motorized valve. Would 3
core and earth 1mm cable have sufficient current carrying capacity
for this application?

Yup. The motor in the valve only takes a fraction of an amp, and 1mm
is rated at 12 amps.

Yes, but don't lose sight of the fact that - in a Y-plan system - the 3-port
valve switches the boiler and pump on in some modes, and the current for
that *also* goes through the room stat - so it's not *just* switching the
valve.

Even so, 1mm cable should be ok.

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Cheers,
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