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Discuss Swa as cpc what size ? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Dear all
    Testing a garage that is fed in 2 core swa using the swa as cpc
    Live and neutral are 2.5mm. I know the swa is fine as a cpc but I’m unsure what size to put on certificate for it
    Seen a table that says it’s equivalent to 17mm but in the back of my mind I remember you need to divide by 8.8
    So which goes on the very. 17mm or 1.93mm
    Thanks in advance
    Cheets
     
  2. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Staff Member Trusted Advisor

    Location:
    Northamptonshire
    You are correct in saying the csa is 17mm and the 8.8 factor (there are other factors within the same ball park) gives its conductivity in terms of copper. Most people will just note swa in the column as opposed to a csa.
     
  3. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Hi westward. Thanks for the reply( prompt as usual). I didn’t think I could put swa in the box of the cert. it’s the Niceic online cert and I think it needs a number so I guess I go with 1.9mm
     
  4. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Staff Member Trusted Advisor

    Location:
    Northamptonshire
    Well the actual csa is 17mm as the other figure is its equivalent to copper in terms of conductivity.
     
    • Agree Agree x 1
  5. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Doh
    Yep there is a copper or steel box from memory so steel 17mm. Perfect. Thank you
     
    • Like Like x 2
  6. Risteard
    Offline

    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    I use "ARM" instead of a numerical value.
     
  7. dnjr
    Offline

    dnjr Electrician's Arms

    Location:
    South coast
    Just tried ‘swa’ but Niceic cert online says it needs a number.
     
  8. Risteard
    Offline

    Risteard Electrician's Arms

    Location:
    Derry, Ireland
    Business Name:
    Walsh Electrical Services
    I don't use the online software but use the Clik software. You could try reporting it as a bug to the NIC.
     
    • Like Like x 1
  9. westward10
    Offline

    westward10 In echoed steps I walk across an empty dream. Staff Member Trusted Advisor

    Location:
    Northamptonshire
    Computer says no:tearsofjoy::tearsofjoy:
     
    • Like Like x 1
  10. davesparks
    Online

    davesparks Trusted Advisor

    Location:
    guildford
    Record the CSA in the box, it doesn’t ask for the ‘copper equivalent’ or calculated value, just the actual CSA.
    If you had aluminium conductors would you calculate the ‘copper equivalent’ or just record the CSA?
     
    • Like Like x 2
    • Agree Agree x 1
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