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Ring Main Joint Box

PG
A kitchen worktop twin S,O, is to be relocated horizontally by about 60cm. 

The ring final cct (RFC) is cabled in buried T&E and the galv' steel back-box is flushed into the plaster/brick wall.

The RFC T&E extension cabling will be buried under plaster, covered in plastic capping along the horizontal  prescribed zone. Visually, it would be reasonable for an electrician to be aware that the route may contain cable(s).

The circuit is RCD protected.

The intent is touse insulated crimp and double insulating tape the jointed cables within the existing box to achieve a maintenance free connection, A 2mm thick (fabricated) plate was to be used to cover the back box and provide additional mechanical protection. The box would then be plastered over.


The questions are:-

1. How many would consider the steel plate back box cover a desirable feature or would a simple plastic cover suffice?

2. Should the original back box be left  unearthed?


Thanks in advance.
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  • 0

    PG:




    Sparkingchip:

    What’s wrong with lifting the floor up in the room above the kitchen and moving the cables so they drop straight into the new socket?


     Andy Betteridge 




    Nothing wrong with your alternative. The horizontal link is easier, I can do it before the kitchen fitter removes all the existing units on the wall.

    Do you think that there is something incorrect with the proposed method Andy?


     




    Yes, it it a  bodge job that won’t comply with the regulations.


    The cable runs will not be in the permitted zones and anyone fixing anything to the wall will not have any idea where the original vertical drop.


    The comments about not earthing back boxes to avoid introducing an earth potential are bizarre.


    I would not use crimps on solid conductors such as those in twin and earth cable.


    If you can lift the floor and move the cable above the kitchen then bring a new drop straight down into the new socket and remove the old redundant cable.


     Andy Betteridge 

Reply
  • 0

    PG:




    Sparkingchip:

    What’s wrong with lifting the floor up in the room above the kitchen and moving the cables so they drop straight into the new socket?


     Andy Betteridge 




    Nothing wrong with your alternative. The horizontal link is easier, I can do it before the kitchen fitter removes all the existing units on the wall.

    Do you think that there is something incorrect with the proposed method Andy?


     




    Yes, it it a  bodge job that won’t comply with the regulations.


    The cable runs will not be in the permitted zones and anyone fixing anything to the wall will not have any idea where the original vertical drop.


    The comments about not earthing back boxes to avoid introducing an earth potential are bizarre.


    I would not use crimps on solid conductors such as those in twin and earth cable.


    If you can lift the floor and move the cable above the kitchen then bring a new drop straight down into the new socket and remove the old redundant cable.


     Andy Betteridge 

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