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S.W.A. Cables in Parallel.

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I have installed two 3 core 6.0mm2 S.W.A. cables in parallel for ease of installation, fused at 60 Amps.  The run is about 20 metres. They are single phase connected. I use Brown as L, Black tagged blue as N and grey oversleeved green and yellow as C.P.C. in each cable.


I have bonded the armour at each end and it is earthed at the origin of the circuit.


I have a niggling feeling that I have missed something. Is the above o.k?


Z.
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    I have a niggling feeling that I have missed something

    The only thing that comes to my mind that you haven't mentioned is consideration of faults - e.g. a fault affecting just one of the cables will likely see the majority of the fault current flow along just one of the cores (or armour) rather than being shared equally between two. That said, it's not normally a problem for just two conductors in parallel (after all half size c.p.c.s are pretty common) - but if you had half a dozen conductors in parallel it could well be an issue (as each core would be so much smaller compared to the protective device).


       - Andy.
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  • 0
    I have a niggling feeling that I have missed something

    The only thing that comes to my mind that you haven't mentioned is consideration of faults - e.g. a fault affecting just one of the cables will likely see the majority of the fault current flow along just one of the cores (or armour) rather than being shared equally between two. That said, it's not normally a problem for just two conductors in parallel (after all half size c.p.c.s are pretty common) - but if you had half a dozen conductors in parallel it could well be an issue (as each core would be so much smaller compared to the protective device).


       - Andy.
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