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Discuss Mains box to Consumer unit SWA or tails? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. grandfortune
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    grandfortune Solar Guru

    Location:
    Midlands
    HI all,

    usually take tails form a MEB box to consumer unit no matter what the length as long as i can get the 50mm depth, builder has told me he wants it in SWA, ive told him its pretty much impossible to terminate it right if i use SWA also i run up the cavity with the tails and there is no way i can get SWA up there so will have to run inside up the wall which i hate doing, what do you guys do if using SWA??

    Cheers
    Grand
     
  2. grandfortune
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    grandfortune Solar Guru

    Location:
    Midlands
    like the look of split concentric??
     
  3. buzzlightyear
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    buzzlightyear Regular EF Member

    Location:
    star command
    is this to a flat?
     
  4. westward10
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    westward10 Please don't bore me with your life story. Electrician's Arms

    Location:
    Northamptonshire
    Split concentric is no longer deemed suitable for use in walls without additional rcd protection, no idea why this is now the case.
     
  5. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    It is the case because it doesn't have an earthed armouring. The earth strands only surround a third of the core, the other two thirds is the neutral.
     
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  6. grandfortune
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    grandfortune Solar Guru

    Location:
    Midlands
    mmmm thats interesting, so surly tails isn't suitable then as the earth is totally separate?, SWA it is then

    its a domestic house btw


    how do you terminate the armored in the mains cupboard, and fook me it will look ugly terminating it into the board.
     
  7. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    Could you terminate the swa into a metal box directly under where the consumer unit is mounted and connect direct ? If not can you use a adaptable box butted up to the consumer unit, gland into that with the cores straight through
     
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  8. westward10
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    westward10 Please don't bore me with your life story. Electrician's Arms

    Location:
    Northamptonshire
    Are you talking concentric or split concentric because I have often wondered as originally it was deemed acceptable.
     
  9. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    Advise the builder that if he wishes to do the electrical installation design then he will have to sign the EIC for design and accept the liability.

    One method of terminating SWA in a meter box is to fit the gland to a short piece of brass angle, then heatshrink the cores with adhesive lined heatshrink to give protection and again heatshrink over the breakout.
    This should give you an idea of what I mean, though in this case the bedding is stripped within the gland and the gland filled with epoxy to seal it.


    IMG_2930.JPG
     
  10. Dave OCD
    Online

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    But if this is a new installation the board itself will be steel and you'd gland straight into it.
     
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  11. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    Terminate the SWA into a metal flush box behind the CU
     
  12. davesparks
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    davesparks Trusted Advisor

    Location:
    guildford
    It will only look ugly if you make it ugly.

    Terminate the SWA into the flush box you fit behind the CU the same as the outgoing circuits.
     
  13. bigspark17
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    bigspark17 Electrician's Arms

    Location:
    wales
    Terminate it into a metal switch fuse isolator as you would use if the cu was >3M away.. you could float it into the back of the board without a gland if the swa was soundly cleated to provide protection of cable being dragged back & that the swa was bangod correctly supply end and a 3rd inner core was used inside the swa, it may be frowned upon & i would only do this as a last resort.
     
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  14. Dave OCD
    Online

    Dave OCD Electrician's Arms

    Location:
    Cornwall
    Business Name:
    Hendry Electrical Services
    Ah the upside down Switchfuse is back. :D
     
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  15. westward10
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    westward10 Please don't bore me with your life story. Electrician's Arms

    Location:
    Northamptonshire
    Bolt an adaptable box to the back using the lid fixing screw points.
     
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