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Ring Main Joint Box

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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  • Former Community Member
    0 Former Community Member
    Could you not convince the customer to leave a surface cover plate exposed and accessible ? There are exceptions for crimp joints in BS7671 if you include the phrase 'or appropriate compression tool' but you are still left with the uncomfortable feeling of inaccessibility. If you must do it then I would go for a steel cover plate as it is not easily combustible and gives additional impact resistance. I would earth the back box as if it were plastered steel capping.
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  • Former Community Member
    0 Former Community Member
    Could you not convince the customer to leave a surface cover plate exposed and accessible ? There are exceptions for crimp joints in BS7671 if you include the phrase 'or appropriate compression tool' but you are still left with the uncomfortable feeling of inaccessibility. If you must do it then I would go for a steel cover plate as it is not easily combustible and gives additional impact resistance. I would earth the back box as if it were plastered steel capping.
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