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Discuss New sub board for shed swa advice. in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Jcamerz
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    Jcamerz New EF Member

    Location:
    Essex
    Hi guys new to the forum after bit of advice. My family are installing a new shed in the garden and require a lot of power ie few sockets, lights. I am planning of running a swa fed from 32a mcb from the main board to a sub board.
    Have a question-
    Shall I install the new 32a mcb in the main board on the RCD side or main switch side?
    Thanks
     
  2. Dillb
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    Dillb Electrician's Arms

    Location:
    Nottingham
    What does it tell your copy of BS7671 about the installation method of the cable needing RCD protection?
     
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  3. LankyWill
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    LankyWill Guest

    I agree with above but as a general rule it is better to use a cable which omits RCD protection on the distribution side. Just think if something trips in the shed it’s going to take all of the other RCD protected circuits out along with it. Install RCD protection in the shed to cover final circuits.
     
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  4. Michael Sands
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    Michael Sands Regular EF Member

    Location:
    Scotland
    Could you fit an RCBO on non rcd side
     
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  5. johnduffell
    Online

    johnduffell Regular EF Member

    Location:
    uk
    are you planning to earth the swa armor and if so what is the design earth loop impedence via the armor at the far end? also what Type is the MCB you are planning to use?
     
  6. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
     
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  7. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    You should always earth the Armour
     
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  8. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    What’s the earthing arrangement ?

    Part p ?........
     
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  9. johnduffell
    Online

    johnduffell Regular EF Member

    Location:
    uk
    I was not suggesting that they shouldn't, but I'm sure there's a lot of SWA with no earth on the armour.
    You wouldn't get any of the benefits of SWA but you'd still get the cost, so it'd be pointless to install RCD protected SWA where normal multi core cable would be allowed.
     
  10. wirepuller
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    wirepuller Forum Mentor

    Location:
    south uk
    Never heard of a Part p earthing arrangement...….
     
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  11. Jcamerz
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    Jcamerz New EF Member

    Location:
    Essex
    Thanks for the replies guys, I was planning on using swa because because it's going to be run external but clip direct not buried at any point.
    I did think RCD only at the sub board would be the best setup.
    Earthing arrangement is TN-CS
    Now the issue with earthing the armour is the main board is plastic so the 'o ring' would be useless but it will be done on the new sub board. Earthing will be identified using the black core both ends.
     
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  12. Dillb
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    Dillb Electrician's Arms

    Location:
    Nottingham
    You can still earth the armourings when terminatimg a SWA into a plastic enclosure, but being a electrician you would of known that anyway wouldnt you?
     
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  13. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    clue might be "earthing nut"
     
  14. LankyWill
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    LankyWill Guest

    Use a Pyranah nut for plastic enclosures
     
  15. Strima
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    Strima Electrician's Arms

    Location:
    St Neots
    73661.jpg
     
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