As you may know from my other posts, I am converting my gravity fed
CH/HW system to a fully pumped solution by moving the pump, adding
2-port valves etc.
I have bought a cylinder stat and a smart pump but neither has any
wire pre-fitted. Do I use "standard" 2-core mains cable for the stat
(there is no earth terminal inside the stat) and 3-core for the pump
(which is earthed)? Or do I need special cable that can withstand high
temperatures, like immersion cable?
I have bought some Horstmann 2-port valves from Screwfix and they do
have pre fitted wire with tinned ends. Is the idea that these are the
correct length already and you do not trim them further? It looks
quite tough wire to cut.
I also bought a CH wiring connection box (SF code 18884) to wire them
into. I know that I need to knock out the tabs along the top and
bottom to let the wire in but I am unsure: how do I stop the wire from
chaffing against the box. I'm thinking back boxes have rubber grommets
but these plastic boxes have nothing. How do I keep the cables neatly
in the box; there are no clamps or anything to hold them, so is it
just a matter of cutting the wires to the right length (the pump cable
doesn't look easy to trim; see above) so that none protrude from the
box? Is there nothing stopping them from falling out if you
(accidentally) tug them?
- posted 12 years ago