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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.
Parents
  • 0
    true - and originally the box would have been earthed, even if not by wire, when the socket was attached to it.

    The better option would be something like a plastic wago box, or heat shrink over the whole lot.

    I'd wholeheartedly agree, plaster and tile adhesive are not exactly good conductors, and if dry may be considered to be insulating but like cement are quite capable of passing a few milliamps in to a hand sized contact area when steamed up a bit.  A good few years  ago, before RCDs were so common, I have seen an emulsion painted wall that when leant on gave a mild tingle sort of shock, but it was only noticed at certain times - when humidity was high as it turned out - the cause was eventually traced to a damaged cable in the room on the other side.
Reply
  • 0
    true - and originally the box would have been earthed, even if not by wire, when the socket was attached to it.

    The better option would be something like a plastic wago box, or heat shrink over the whole lot.

    I'd wholeheartedly agree, plaster and tile adhesive are not exactly good conductors, and if dry may be considered to be insulating but like cement are quite capable of passing a few milliamps in to a hand sized contact area when steamed up a bit.  A good few years  ago, before RCDs were so common, I have seen an emulsion painted wall that when leant on gave a mild tingle sort of shock, but it was only noticed at certain times - when humidity was high as it turned out - the cause was eventually traced to a damaged cable in the room on the other side.
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