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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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    Or measure PSSC ( which is like Zs but for L-N  voltage drop after all) at the proposed point of spur, and see how far off the maximum resistance and V drop you are permitted.

    Or do a dead test and measure the ring resistance with the meter on low ohms range  - but  very rarely will you know the cable lengths accurately enough to calculate.


    Mike.
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    Or measure PSSC ( which is like Zs but for L-N  voltage drop after all) at the proposed point of spur, and see how far off the maximum resistance and V drop you are permitted.

    Or do a dead test and measure the ring resistance with the meter on low ohms range  - but  very rarely will you know the cable lengths accurately enough to calculate.


    Mike.
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