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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:

    That fails the 1/8 rule of thumb design rule, there’s a few other potential issues as well.


    If you look in the Commentary, you'll see where the 1/8 rule came from ... it's to do with loop impedance not "mis-loading" or anything else.


    You can see that from my previous post.


    Whether the socket-outlet is added on the ring itself or a spur won't affect the loading of the ring at all - but too many outlets or connection points or spurs at one point of course can do so, unless you know the loads will be small (e.g. concentration of outlets near a TV).


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  • 0
    Sparkingchip:

    That fails the 1/8 rule of thumb design rule, there’s a few other potential issues as well.


    If you look in the Commentary, you'll see where the 1/8 rule came from ... it's to do with loop impedance not "mis-loading" or anything else.


    You can see that from my previous post.


    Whether the socket-outlet is added on the ring itself or a spur won't affect the loading of the ring at all - but too many outlets or connection points or spurs at one point of course can do so, unless you know the loads will be small (e.g. concentration of outlets near a TV).


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