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Discuss very low pfc on submain board in the Periodic Inspection Reporting & Certification area at ElectrciansForums.co.uk.

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  1. lucus
    Offline

    lucus Regular EF Member

    hi all hoprfully someone here can answer this question for me: i tested a sub mains today and i only got 0.35 KA is this normal for a submains as at the main mainsboard the pfc is 3.3 KA the main fuseboard has a rcd main switch so at the submain i had to use no trip pfc not sure is this makes and difference any imput would be great.
    regards
     
  2. Sintra
    Offline

    Sintra The Innkeeper Staff Member

    Location:
    Belfast/London
    Did you test Zs at sub main and if so what was this reading.
     
  3. lucus
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    lucus Regular EF Member

    hi
    yes zs was 0.36 the submain is fed via a 6mm armoured cable
     
  4. marcusone
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    marcusone Electrician's Arms

    Location:
    Bristol
    Hi Lucus

    What was your Zs at the sub main ? It will be higher than at the origin so therfore the PFC will be lower.

    So as long as all protective devices throughout the installation have a breaking capacity equal to or more than the origin main protective device,then recording the origin PFC is good enough.

    Mark
     
  5. pevvers
    Offline

    pevvers Electrician's Arms

    Location:
    London
    That PFC would be for a Zs at the board at around 0.65 ohms. So not sure where you're going wrong there.... You should be getting a PFC of around 0.68kA if all correct.
     
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