S.W.A. Cables in Parallel.

Andy Shepherd:

I don't see an issue with your install. Colour coding is a matter of preference although I personally use black as the CPC as long as you have identified your conductors its fine.

Sounds like you have kept both cables the same length, if I were to do this I would add cable tags on the outer sheath (brass with steel ties) stating that both conductors are part of the same supply.

The cables have exactly the same origin, follow the same route and have the same destination and consumer unit.


Z.

I have a niggling feeling that I have missed something

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.