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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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  • Former Community Member
    0 Former Community Member
    Hi, additional the advice in other posts, outdoors your outside the building equipotential zone so will possibly need to consider appropriate protection via an RCD and safe trip current rating  housed in IPXX box. If this is not done well garden equipment ( which are notoriously dirty ) could take down the buildings ring circuit inadvertently and therefore any equipment connected to it. While it might be annoying it would be prudent to run a radial from the FB in  4mm2 depending on max load and VD and short circuit calc.
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  • Former Community Member
    0 Former Community Member
    Hi, additional the advice in other posts, outdoors your outside the building equipotential zone so will possibly need to consider appropriate protection via an RCD and safe trip current rating  housed in IPXX box. If this is not done well garden equipment ( which are notoriously dirty ) could take down the buildings ring circuit inadvertently and therefore any equipment connected to it. While it might be annoying it would be prudent to run a radial from the FB in  4mm2 depending on max load and VD and short circuit calc.
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