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Please can someone tell me the equation to work out PFC? I honestly just cannot remember it and cant seem to find my BRB :/.

Cheers
 
ur not telling me its just 230/Ze?

That fine for calculating Prospective earth fault current TNS and not Prospective fault current PFCthis is the highest value of either Pscc or Pef

Unless earthing system is TNCS then above formula is correct
 
Last edited by a moderator:
what other formula would you use to work out a current when you have a voltage and resistance value?

If a TNS or TT system and you are unable to directly measure PSCC you can use your ELZ tester and connect the green to neutral, black to neutral and red to phase/line the measured value is the total impedance of phase/line neutral loop Zpscc

then measured voltage/ Zpscc = Ipscc
 

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