Whats PSC stand for and what is it?

pushrod · Nov 14, 2010

cairns said:
Cheers for all your answers-

so I have now established that:

PSCC = prospective short circuit current (L-N fault single phase L-L three phase)
PEFC = prospective earth fault current (L-E fault)
PFC = prospective fault current is the higher value obtained of the other two

What are the formulas for calculating these?

Your pfc tester can do it for you, or to calculate pfc on single phase you could do 230V (or measured voltage) divided by Ze although won't be quite accurate as max pefc will be with bonding in place, which will give a lower external loop impedance and consequently larger fault current. Pscc will be the voltage divided by the the external loop impedance between line and neutral. (it is slightly different with 3 phase)