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Cable calculations

MrJack96
Hi guys i wanted to calculate the maximum run when spuring of a ring final circuit is there any equations or is it just as simple as calculating VD to the furthest point in the ring and then VD to the end of the spur. The reason for the question is I want to spur of an existing socket using a 10meter run of 2.5 for an outside socket. Just want to Double check it’s sufficient 


thanks guys
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    MrJack96:

    So are you saying running an swa outside to feed an rcd socket isn’t compliant? 


    Yes. Odd though it may seem, they are not a type of RCD that is approved in BS 7671. However, I certainly haven't rushed to change my 15th Edn installation at home. I have simply replaced defective SRCDs with new ones.


    If you search through the Forum, you will find quite a bit of discussion on the topic.


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    MrJack96:

    So are you saying running an swa outside to feed an rcd socket isn’t compliant? 


    Yes. Odd though it may seem, they are not a type of RCD that is approved in BS 7671. However, I certainly haven't rushed to change my 15th Edn installation at home. I have simply replaced defective SRCDs with new ones.


    If you search through the Forum, you will find quite a bit of discussion on the topic.


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