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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

    I'm still researching this topic. Find it quite insightful in general.

    I'm thinking to buy “IET Wiring Regulations: Electric Wiring for Domestic Installers” by Scaddan Brian. (Which I assume would be sufficient for what I'm doing?)

    I noticed some light switches are 2-way or 3-way. I'm planning to use one wired switch, with the rest replaced by some battery power switches. If the wiring is like the image below (although I have not checked), would it be legal for me to terminate the live and neutral wire at the topmost box? Such the live and neutral wires to the latter two junction boxes will be abandoned. I assume it would be reasonable to leave the earth connected to other back boxes? 

    f6e3d98978bc24786e9bd0d965837640-original-image.png
    3-way switch (without neutral wire?)

     

    I assume I need some labelling to indicate the abandoned neutral and live wires, are there any conversions? I will put a blank plate on the latter two back boxes with abandoned wires, and just glue the battery-power switch on top, so you can't tell from a distance.

    Based on 3.13 of the Part P, I need somehow get the “non-notifiable work” inspected and tested. What is the most economic way of achieving it? (I will of course keep a record of all the modifications I made so it can be referenced later)

     

Reply
  • Former Community Member
    0 Former Community Member

    I'm still researching this topic. Find it quite insightful in general.

    I'm thinking to buy “IET Wiring Regulations: Electric Wiring for Domestic Installers” by Scaddan Brian. (Which I assume would be sufficient for what I'm doing?)

    I noticed some light switches are 2-way or 3-way. I'm planning to use one wired switch, with the rest replaced by some battery power switches. If the wiring is like the image below (although I have not checked), would it be legal for me to terminate the live and neutral wire at the topmost box? Such the live and neutral wires to the latter two junction boxes will be abandoned. I assume it would be reasonable to leave the earth connected to other back boxes? 

    f6e3d98978bc24786e9bd0d965837640-original-image.png
    3-way switch (without neutral wire?)

     

    I assume I need some labelling to indicate the abandoned neutral and live wires, are there any conversions? I will put a blank plate on the latter two back boxes with abandoned wires, and just glue the battery-power switch on top, so you can't tell from a distance.

    Based on 3.13 of the Part P, I need somehow get the “non-notifiable work” inspected and tested. What is the most economic way of achieving it? (I will of course keep a record of all the modifications I made so it can be referenced later)

     

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