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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:

    The Onsite Guide puts it much more succinctly:


    7.2.2 Socket-outlet circuits

    As a rule of thumb for rings, unfused spur lengths should not exceed 1/8 the cable length from the spur to the furthest point of the ring.


    So if the spur is adjacent to the DB, that gives 80 m to the furthest point and 160 m all the way round. That's a long ring!


    In fact all may be well if the load is not great. Perhaps an FCU in the spur would help?


    ETA: IMHO spurs should be avoided. We are not aiming to make a coronavirus! ?


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  • 0
    Sparkingchip:

    The Onsite Guide puts it much more succinctly:


    7.2.2 Socket-outlet circuits

    As a rule of thumb for rings, unfused spur lengths should not exceed 1/8 the cable length from the spur to the furthest point of the ring.


    So if the spur is adjacent to the DB, that gives 80 m to the furthest point and 160 m all the way round. That's a long ring!


    In fact all may be well if the load is not great. Perhaps an FCU in the spur would help?


    ETA: IMHO spurs should be avoided. We are not aiming to make a coronavirus! ?


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