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the wires from the boiler are 1 red, 1 black & 1 yellow/green which go to a junction box (very similar to a light switch box) with a on / off switch on it. Into this junction box also comes the live feed from the main junction box and then someone has taken off a feed for the original fixed...

Hi I have taken out the existing room thermostate which was wired up with 2 cables, 1 Live & 1 neutral. The wiring diagram is showing 2 lots of cables and talks of 'switch live' connection back to the boiler. Can someone explain in laymans terms what it is i need to do extra that isn't...