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Regulation for rewring back box?

Former Community Member
Former Community Member

Hi, I'm currently holding an MEng in EEE, but not a certified electrician otherwise. 

I want to install smart light switches in my “dwelling”. I have encountered issues where the current back box is standard 74x74x25, but I would need extend it to 86x86x38 for the new light switch. 

I want check do I need part P certificate, or planning permission? How to be compliant while minimise the cost? (I have no experience in dwelling electrical work)

PS: The dwelling is a new build (2019) 
PPS: I might consider obtain required certificate(s) myself if is not too expensive. Since I like do these kind of work, so it might be cost effective in the long term. 

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    Bear in mind there could be more than one circuit at both switches and lighting points.

    I got caught out at a light fitting, I could see it from the consumer unit, so turned the lamp on then turned the breakers off to find the one that disconnected the supply to the lamp by watching the lamp extinguish.

    Then I got up to start work and got a shock, because there was another circuit looped through the ceiling rose to the one that the switched live for the lamp came from.

    Assume everything has been wired by an idiot just to be on the safe side and there may be multiple supplies at light fittings from different circuits, as well as at switches where they are to be expected.

    As you have a modern installation it’s unlikely there’s borrowed neutrals interconnecting circuits, but again don’t assume that is so and actually check the neutrals have not got voltage on them as you disconnect things.

    As said above it’s good practice to maintain the circuit protective conductor and earth the unused live conductors both line and neutral. 

     

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  • 0

    Bear in mind there could be more than one circuit at both switches and lighting points.

    I got caught out at a light fitting, I could see it from the consumer unit, so turned the lamp on then turned the breakers off to find the one that disconnected the supply to the lamp by watching the lamp extinguish.

    Then I got up to start work and got a shock, because there was another circuit looped through the ceiling rose to the one that the switched live for the lamp came from.

    Assume everything has been wired by an idiot just to be on the safe side and there may be multiple supplies at light fittings from different circuits, as well as at switches where they are to be expected.

    As you have a modern installation it’s unlikely there’s borrowed neutrals interconnecting circuits, but again don’t assume that is so and actually check the neutrals have not got voltage on them as you disconnect things.

    As said above it’s good practice to maintain the circuit protective conductor and earth the unused live conductors both line and neutral. 

     

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