Rewiring boiler controller

[thelaj]

My house has a single circuit combi boiler, with an Altech C014 Controller and wireless thermostat. I want to replace this with a Drayton Wiser controller. Both of these are double insulated.

Photos show the existing wiring, and my proposed new wiring for three new backplate. Is it correct, or should I be getting an electrician?

Thanks

 

[AndyPRK]

looks ok to me, but doing go doing it in the dark or just before xmas !!!

 

[CountryFan]

As above, looks ok, but the green/yellow shouldn’t really be used for a live wire. Perhaps brown sleeve it or use brown insulation tape.

 

[EFLImpudence]

Yes, your diagram is correct.

It has recently been made against the regulations to use the earth wire as a live conductor but it was not when installed.

It would be good to sleeve it brown but it doesn't really make much difference.

 

[thelaj]

Thanks so much. My spark wanted £120 to do this, which I don’t begrudge him, buts it’s a lot to change 4 wires.

 

[ericmark]

The bi-colour combination green-and-yellow shall be used exclusively for identification of a protective conductor and this combination shall not be used for any, other Purpose.

Note the full stop, it does continue

Single-core cables that are Coloured green-and-yellow throughout their length shall only be used as a protective conductor and shall not be over-marked at their terminations, except as permitted by Regulation 514.4.3.
In this combination one of the colours shall cover at least 30 % and at most 70 % of the surface being coloured, while the other colour shall cover the remainder of the surface.
A bare conductor or busbar used as a protective conductor shall be identified. where necessary, by equal green-and yellow stripes, each not less than 15 mm and not more than 100 mm wide, close together, either throughout the length of the conductor or in each compartment and unit and at each accessible position. If adhesive tape is used, it shall be bi-coloured.

But this is when I studied English a separate statement, so not been permitted since 2008, I have not got earlier books to hand.

This has been clarified in latter editions, however we can go back to 1966 where fixed equipment must have an earth run to it, even it the device is class II, except for a lamp holder having no exposed-conductive-parts and suspended from such a point. Most devices designed for the British market have a tether point to park the earth wire, even when not required.

Even the 13th edition only allowed "filament lamps" so looking before 1955 for that wiring to have complied.

However, if I found it in my house, I would not be too worried about over sleeving the earth wire and connecting it up. But with someone else's house, I would refuse to connect it up, so.

Thanks so much. My spark wanted £120 to do this, which I don’t begrudge him, buts it’s a lot to change 4 wires.

The charge is not as bad as it seems when he would need to run in a new cable to comply, personally I would run two cables one for mains supply (low voltage) and one for control which would allow it to be used with extra low voltage (0 - 48 volt) in the future should a boiler with OpenTherm.