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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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  • Former Community Member
    0 Former Community Member

    Hi Bod,

    Thank you for your instant reply. I'm trying to follow, I have few additional questions:

    1. Is the “not available in the UK” a red flag? If I can buy it, would I able to install it in a compliant way (as long as it has CE marking)?

    2. For the practical solution, do you mean because both the 74 mm back box and 86 mm back box have 60mm screw fixing, this problem is effectively extending the depth of the standard back box and cut a bigger hole in the wall to be 86 mm?

    3. Do you have any comments about compliance? If I do what I said in point 2, am I breaking any code? Do I need to find a certified electrician? 

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  • Former Community Member
    0 Former Community Member

    Hi Bod,

    Thank you for your instant reply. I'm trying to follow, I have few additional questions:

    1. Is the “not available in the UK” a red flag? If I can buy it, would I able to install it in a compliant way (as long as it has CE marking)?

    2. For the practical solution, do you mean because both the 74 mm back box and 86 mm back box have 60mm screw fixing, this problem is effectively extending the depth of the standard back box and cut a bigger hole in the wall to be 86 mm?

    3. Do you have any comments about compliance? If I do what I said in point 2, am I breaking any code? Do I need to find a certified electrician? 

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