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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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    Sparkingchip:

    Yes there is a formula, it depends on the position of the spur in the ring, I will have to look it up to be accurate.




    I sat down at my desk about twenty minutes ago and have been trying to find it in the IET books on my bookshelf, but can't. I know it is in one of the IET books, but cannot remember which one.


    Basically you should not end up with a long spur on a short ring, say a 10 metre spur on the end of a ring with 6 metres of cable in it and the length of the spur depends on its position in the ring. I know it's in one of the IET books, but it's not coming readily to mind which one its's in ?


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  • 0
    Sparkingchip:

    Yes there is a formula, it depends on the position of the spur in the ring, I will have to look it up to be accurate.




    I sat down at my desk about twenty minutes ago and have been trying to find it in the IET books on my bookshelf, but can't. I know it is in one of the IET books, but cannot remember which one.


    Basically you should not end up with a long spur on a short ring, say a 10 metre spur on the end of a ring with 6 metres of cable in it and the length of the spur depends on its position in the ring. I know it's in one of the IET books, but it's not coming readily to mind which one its's in ?


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