"LOZ34" wrote in message
...

you calculate it using the earth loop impedance and the supply
voltage.
PSCC = Ze / supply voltage

Obviously you meant to write that the other way up, PSSC = Uo / Ze (where Uo
is the supply voltage).

It could still be wrong though: Ze is the earth fault loop impedance at the
supply terminals, so what you are calculating is the prospective earth fault
current. This is only the same as the PSSC in a TN-C-S (PME) supply. On
TN-S and TT systems the supply impedance (between phase and neutral) will
usually be lower than Ze.

IOW to determine the PSSC at the origin of a non-PME supply you must do the
loop test between phase & neutral, not phase & earth, then divide the
measured value into 230 V.

--
Andy