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Discuss SWA outer armour not earthed at either end. in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. Fitzy
    Offline

    Fitzy Newly Qualified Sparky Electrician's Arms

    Location:
    Redhill
    Business Name:
    DF Electrical Services
    A friend at work asked me to take a look at the electrics in his shed, RCD would occasionally trip out, turned out to be a very loose neutral going in to the RCD.

    One thing I did notice though was that the 10MM2 SWA entered through the back entry point of both the shed & house CU and neither end of the outer sheath was connected to the earth bar and was also very loosely pushed through at the shed end directly from outside of the shed. I thought that the outer armour of the SWA cable had to be earthed at at least one end, if not both? Am I right here?
     
    Last edited: Mar 15, 2019
  2. spinlondon
    Offline

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    Yes, it should be earthed, preferably at the supply end.
     
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  3. Fitzy
    Offline

    Fitzy Newly Qualified Sparky Electrician's Arms

    Location:
    Redhill
    Business Name:
    DF Electrical Services
    So one end is ok then?

    I was thinking of adding the brass gland to the supply end, then run an earth fly lead to the cu early bar, is this ok?

    Plus, is ok to use the back entry for swa cable, or should it always be glanced at both ends?
     
  4. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    Is there a core being used as the cpc inside the SWA?
    The armour should be earthed at supply end at least.

    10mm? What the heck has he got inside the shed?
    or is that, what the heck is he growing inside the shed?
     
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  5. buzzlightyear
    Offline

    buzzlightyear please let me back in to the prison cell. Electrician's Arms

    Location:
    star command
    what do you think ,me. Earth both ends and till their is a earthling on the end of it.
     
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  6. Risteard
    Online

    Risteard Respected Member

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    Really both ends should be earthed generally. Supply end only is not good practice without good reason.
     
    • Agree Agree x 2
  7. spinlondon
    Offline

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    If you need to isolate the earth, you can get special glands, or if it’s a plastic CU in the shed, just don’t use a banjo and fly lead.
     
  8. Loki
    Offline

    Loki Trainee Access

    Location:
    Devon
    I’m suspecting they’re using a core back for earth. From what I remember tncs required either a 10mm earth or a tt spike near the shed.
     
  9. Fitzy
    Offline

    Fitzy Newly Qualified Sparky Electrician's Arms

    Location:
    Redhill
    Business Name:
    DF Electrical Services
    Yes, the black core has been used as the earth, the house’s supply is TN-S and the SWA run is roughly 30m in total. One light circuit and 2 socket radials in the shed.

    Is it ok to go directly in through the back of the db, directly from outside? There’s been no mastic used to fill the rear entry hole either. I would’ve clipped the swa to the inside wall of the shed, then in to the db.
     
  10. Andy78
    Offline

    Andy78 Respected Member

    Location:
    Kingston upon Hull
    Yes glands should be used for proper termination. It's part of the cable system. You wouldn't use MI without a gland .......
     
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  11. Baddegg
    Offline

    Baddegg Still simmering Ken, not boiled yet buddy x Electrician's Arms

    Location:
    Portsmouth
    I would terminate into a wiska/adaptable box fitz and then from that to the Cu in t&e
     
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  12. Fitzy
    Offline

    Fitzy Newly Qualified Sparky Electrician's Arms

    Location:
    Redhill
    Business Name:
    DF Electrical Services
    I did suggest re-routing the swa to the inside wall, then glanded in to the shed db, luckily there’s enough slack in the swa to still reach the db from inside, then i’ll fill the hole in shed wall.

    It was only done last summer by an electrician friend of a friend.
     
  13. derek
    Offline

    derek Regular EF Member

    Location:
    South of England
    Ees not an electrician, ees a very nawty boy! (said in a voice similar to Brian's mum from Life of Brian)
     
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