Discuss very low pfc on submain board in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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lucus

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
 
Did you test Zs at sub main and if so what was this reading.
 
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
 
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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