"Philip Oldrosedene" wrote in message
...
I wish to bring a remote CH motorized valve (Honeywell make) into
use. It wasn't connected when the CH was installed as the valve was
a last minute thought and no suitable cable was to hand. Up to now (8
years!) it has been left in the ON position.

Depending on route chosen, it will require 5 to 8m of cable to connect
to the main CH controller. The cable into the valve is 5 way x 0.8mm
sq (ie 1.0mm dia) - 4 control lines plus earth. The valve operates at
240V, so the cable needs to be rated for mains.

For preference I should like to use standard elec backing boxes to
house the connections at each end, and bury the cable run under the
wall plaster.

Please can anyone suggest a suitable cable & source?

Just use two runs of 1mm twin & earth.
I don't know the layout of your system, but won't the zone-
valve need to be wired to the boiler wiring centre rather than
the controller? perhaps this is the same place in your situation.

Do you understand how the zone valve operates? The "4 control
lines" as you put it a- one pair for the actuator motor (designed
to work permanently stalled) and the other pair is a micro-switch
which closes when the valve is fully open, and calls for heat.

--
Graham.

%Profound_observation%