Hi guys,
I have got measured Zs and Ipfc at a 3-phase distribution board from the EICR, but have no information of all upstream equipment including cable lengths/ sizes from the 230V source.
To my understanding, there's no way I can derive the voltage drop up to that DB from Zs/ Ipfc because I'll need the earth-fault current or phase-phase impedance. Am I correct?
Second question is: In the same case, say a 1-phase load is supplied by this distribution board, and i'd like to know the prospective short circuit current to check against the disconnection time of the circuit breaker.
The pscc at the load end cannot be calculated as well because i'll need to know the voltage at the load and total loop impedance?
Thanks!
