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Single phase sub-main

GA

Evening, I'm seeking some advise pls. I have a 4core 25mm2 SWA and was going to use this for two single phase submains running from and to a common point, where the circuits will then go into separate consumer units. limited loads a garage and stable. The cable will have DP isolation and RCD protection on each circuit (2cores L+N per sub main) at the supply point. I'm also looking to run a separate earth cable of 25mm2 which would be common to both circuits and armouring of the SWA cable is also earthed and common. My question is I believe this to be complaint with 17th Ed; As I can't see anything saying its not. Second question, could I common the neutral for both submains and therefore use the fourth conductor in the SWA as an earth which would save installing the separate earth cable? Again, I can't see anything incorrect as limited loads to a couple of sockets and a few lights.  thanks for assistance. GA

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    It would be cleaner if the 4 cores were one high current circuit at the origin, and then split into two at the load end, perhaps with an adaptable box and some line taps. You do not really want a situation where two switches are needed to make one cable dead.

    Check the armour resistance, but you should be OK with LL NN and armour as CPC. perhaps some decent glands and pirahana nuts are in order.

    Mike.

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    It would be cleaner if the 4 cores were one high current circuit at the origin, and then split into two at the load end, perhaps with an adaptable box and some line taps. You do not really want a situation where two switches are needed to make one cable dead.

    Check the armour resistance, but you should be OK with LL NN and armour as CPC. perhaps some decent glands and pirahana nuts are in order.

    Mike.

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