I would like to upgrade my central heating from gravity hot water to
fully pumped. I have bought a cylinder thermostat and it says to
connect it with 2 core flex.
Do I run a long length of flex all the way from the cylinder upstairs
to the boiler, pump, and valves, downstairs or should I run a short
length of flex from the cylinder thermostat to a junction box in the
airing cupboard and then use twin and earth for the long run to the
boiler? Or doesn't it really matter? Do you use whatever is to hand?
On the subject of using whatever is to hand, I am also replacing the
old clockwork time switch with a digital programmer. I know I can buy
multicore wire to connect to this but if I have 2 or 3 core cable
already, can I just use a few lengths of these?
I have something in the garage. I cant remember if it is 2 or 3 core.
If it is 3 core, can I use this for the thermostat and just snip off
the earth or is that considered bad practice? Should earths always be
connected to something?
If it is 2 core, is it alright to use that to run from the wiring
centre to the programmer since the programmer does not need an earth?
Or is it good practice to always have an earth (there is a brass
terminal in the back plate to connect one to if required).