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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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    I would say that whether or not it's acceptable is dependent upon the length of the FRC, and whether there are existing spurs, i.e. estimated voltage drop . A historic floor area of 60 m² has been adopted for the final ring circuit (BS 7076 - P505); if this checks out, a length of 10m for an unfused spur to a single or double 13A socket is probably OK, (no cable length is given for a FRC or an unfused spur in BS7671). A 4mm² cable could also be considered if necessary.


    Jaymack.
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    I would say that whether or not it's acceptable is dependent upon the length of the FRC, and whether there are existing spurs, i.e. estimated voltage drop . A historic floor area of 60 m² has been adopted for the final ring circuit (BS 7076 - P505); if this checks out, a length of 10m for an unfused spur to a single or double 13A socket is probably OK, (no cable length is given for a FRC or an unfused spur in BS7671). A 4mm² cable could also be considered if necessary.


    Jaymack.
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