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Discuss Temporary building supplies again in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    just wondering how you guys,install temp electrics to portacabins
    Seen a lot of installs on sites & at schools where I don’t think it’s correct.
    Mainly earthing,& earthing conductors,or am I being over cautious,cheers.
     
  2. The_apprentice2.0
    Offline

    The_apprentice2.0 Regular EF Member

    Location:
    liverpool
    I don't do a lot of it personally, but there is a standard for temp supplies, have a look at BS7909 think its tailored more to events etc but might be some help o_O
     
  3. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    Ok
     
  4. essex
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    essex Forum Mentor

    Location:
    Wiltshire
    As per Section 717 of BS 7671:2018.
     
  5. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    Agree,but I haven’t seen that being done on sites
     
  6. spinlondon
    Offline

    spinlondon Forum Mentor

    Location:
    Harlow Essex
    A lot of Portacabins seem to come pre-wired with commando sockets to link them together.
     
  7. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    Yea,more intrigued by the supply & Main bonding to it
     
  8. driverman
    Offline

    driverman DIY

    Location:
    England
    I'm under the impression that temp supplies have to be TT earthing.
    DNO's usually insist on TT earthing for temp supplies. They will not provide PME for temp supplies.
    Even if Perm supply, aren't porta cabins classed as temp building as they are movable?
     
  9. cliffed
    Offline

    cliffed Regular EF Member

    Location:
    Lancs
    Thanks,seen so many not tt,& agree Pme should not be used.
     
  10. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    I agree. We test a lot of steel shipping containers and they are almost never done correctly. Usually connected to a PME earth is the issue.
     
  11. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    Need PAT testing then.
     
  12. wirepuller
    Offline

    wirepuller Forum Mentor

    Location:
    south uk
    TT is not always required. TNS is acceptable. A TNCS supply to a transportable unit can be used where the installation is under the continual supervision of a skilled or instructed person. This may be the case in the units you have observed not on a TT
     
  13. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    Any transportable unit will need an earth electrode installed unless it is under the supervision of 'skilled or instructed person(s)' in which case the PME can be used.

    Construction sites also need to comply with Section 704 as well as 717.
     
    • Like Like x 1
    • Agree Agree x 1
  14. wirepuller
    Offline

    wirepuller Forum Mentor

    Location:
    south uk
    A transportable unit connected to a TNS earth will not need an earth electrode or to be under supervision.
     
    • Agree Agree x 2
  15. essex
    Offline

    essex Forum Mentor

    Location:
    Wiltshire
    I know. Thanks for that.
     
    • Like Like x 2
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