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Is there a maximum length for a spur cable?

Former Community Member
Former Community Member
Good afternoon, hope you are all well.

Just two quick questions.

Is there a maximum length for a 2.5mm twin and earth spur cable terminated in a ring final wall socket?

Is there a maximum length for a 2.5mm twin and earth spur cable terminated in the Consumer unit RCBO which also supplies a ring final. I understand that there can only be one spur cable from the RCBO. So max three cables in RCBO. 


As always, many thanks in advance.

Simon

Parents
  • Former Community Member
    0 Former Community Member
    Good afternoon, 

    Thank you so much for all your replies, they have been most helpful. Having just looked under the floorboards I do see junction boxes so I am not confident that my original sockets are served by a proper ring either. It tested ok when the electrician installed the CU, but I would rather have a circuit layout I know and can put on a drawing for anyone to refer to. I have tried the voltage drop calculator for my situation, especially the long spur, and all seems ok. I will know for sure when it is properly tested by an electrician, but it's good to know in theory, what I want to do is ok.


    Kind regards

    Simon
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  • Former Community Member
    0 Former Community Member
    Good afternoon, 

    Thank you so much for all your replies, they have been most helpful. Having just looked under the floorboards I do see junction boxes so I am not confident that my original sockets are served by a proper ring either. It tested ok when the electrician installed the CU, but I would rather have a circuit layout I know and can put on a drawing for anyone to refer to. I have tried the voltage drop calculator for my situation, especially the long spur, and all seems ok. I will know for sure when it is properly tested by an electrician, but it's good to know in theory, what I want to do is ok.


    Kind regards

    Simon
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