Another example of mad wiring. The 3 port valve on our heating has come to the end of its life. Having taken the lid off the 'wiring centre' to connect in the replacement I found this madness.
Unsurprisingly there are two groups of green/yellow wires. One set is the actual CPC, the other is the return from the tank stat. Even taking careful note of the existing wire positions and swapping them out one at a time I was still doubting myself and triple-checking that I'd not inadvertently connected the earthed heating system to the mains!
This also appears to be an example of 'how many types of cable can we used in one box'. There's twin and earth, three-core and earth, 3 core flex, 5 core flex, and even a (redundant) couple of pieces of 6241Y single and earth tucked away in the back of the box. Are all heating systems wired this badly?
Oh, and not forgetting the hole through with all of the cables pass through into the back box. It was blatantly made using the combination of a screwdriver and a hammer.
Unsurprisingly there are two groups of green/yellow wires. One set is the actual CPC, the other is the return from the tank stat. Even taking careful note of the existing wire positions and swapping them out one at a time I was still doubting myself and triple-checking that I'd not inadvertently connected the earthed heating system to the mains!
This also appears to be an example of 'how many types of cable can we used in one box'. There's twin and earth, three-core and earth, 3 core flex, 5 core flex, and even a (redundant) couple of pieces of 6241Y single and earth tucked away in the back of the box. Are all heating systems wired this badly?
Oh, and not forgetting the hole through with all of the cables pass through into the back box. It was blatantly made using the combination of a screwdriver and a hammer.