S.W.A. Cables in Parallel.

AJJewsbury:

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.

The armouring is reliably earthed and the cables have a separate core as an additional C.P.C. each as well. The back up fuse is a 60 Amp B.S. 1361/88 or whatever we call them these days. If the cable was spiked the fuse would blow (fault of negligible impedance). The cable route underground is reliably marked, the rest is surface wired.


Z.

AJJewsbury:

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.

The armouring is reliably earthed and the cables have a separate core as an additional C.P.C. each as well. The back up fuse is a 60 Amp B.S. 1361/88 or whatever we call them these days. If the cable was spiked the fuse would blow (fault of negligible impedance). The cable route underground is reliably marked, the rest is surface wired.


Z.