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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

    Chris Pearson: 

    What you have is T&E used as switched lines, which is why they have brown sleeving. Three way (or four plus) involves crossover switches.

    I think my previous post says my reasoning for thinking the T&E wiring is not used as a switched line. (no borrow). Please correct me if I'm wrong.

     

    I might add that there is more than one way to wire two-way lighting.

    Yes, I'm currently aware of two ways,

    f0e57af319a4e2206f5cc539bd3d7ea9-original-image.png
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  • Former Community Member
    0 Former Community Member

    Chris Pearson: 

    What you have is T&E used as switched lines, which is why they have brown sleeving. Three way (or four plus) involves crossover switches.

    I think my previous post says my reasoning for thinking the T&E wiring is not used as a switched line. (no borrow). Please correct me if I'm wrong.

     

    I might add that there is more than one way to wire two-way lighting.

    Yes, I'm currently aware of two ways,

    f0e57af319a4e2206f5cc539bd3d7ea9-original-image.png
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