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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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    An accessory, or blanking plate, fitted directly above the hidden box at high level would define a zone below it. Ideally with the plaster cut away to expose the cables, to ensure exact location and avoid screwing into them.

    As for earthing the old box, depends on your method of maintenance-free connection, the screw terminal for earth connection in the box would not be maintenance-free. I might not bother tbh, it would be a random bit of metal behind tiles, unless there is earthed metal conduit in the drop which acts as a cpc.


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  • 0
    An accessory, or blanking plate, fitted directly above the hidden box at high level would define a zone below it. Ideally with the plaster cut away to expose the cables, to ensure exact location and avoid screwing into them.

    As for earthing the old box, depends on your method of maintenance-free connection, the screw terminal for earth connection in the box would not be maintenance-free. I might not bother tbh, it would be a random bit of metal behind tiles, unless there is earthed metal conduit in the drop which acts as a cpc.


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