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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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    gkenyon: 
    However, would you as a designer recommend Section 705 for the stables in order to protect horses (and yourself from being sued)? I think I would lean towards that to be honest.

    The floor of the particular stables that I am thinking of is made of sets (with appropriate channelling for urine to flow into the drains). There are no extraneous conductive parts and I don't see why a stable would require them. The only exposed conductive parts are the lighting switch drops in steel conduit. I cannot see how a PME supply would be a threat to anybody: two-legged or four.

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    gkenyon: 
    However, would you as a designer recommend Section 705 for the stables in order to protect horses (and yourself from being sued)? I think I would lean towards that to be honest.

    The floor of the particular stables that I am thinking of is made of sets (with appropriate channelling for urine to flow into the drains). There are no extraneous conductive parts and I don't see why a stable would require them. The only exposed conductive parts are the lighting switch drops in steel conduit. I cannot see how a PME supply would be a threat to anybody: two-legged or four.

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