I have both TNS and IT system and While sizing the cables, Can I use the below equation for both the TNS and IT systems, in arriving at the maximum cable length for the end of fault current.
I have both TNS and IT system and While sizing the cables, Can I use the below equation for both the TNS and IT systems, in arriving at the maximum cable length for the end of fault current.
Since the equation is to determine the fault current at the end of line (before the downstream circuit breaker); In other words, minimum short circuit current (at the end of line) is used to verify whether the circuit breaker can be tripped for the magnitude of short circuit current at the end of line.
I have a question that, Why no source impedance has been included in the below equation from the Schneider cahier technique? If the source impedance is included, it would further reduce the short circuit current. So, I think source impedance to be included in the equation to determine the end of fault current.
Since the equation is to determine the fault current at the end of line (before the downstream circuit breaker); In other words, minimum short circuit current (at the end of line) is used to verify whether the circuit breaker can be tripped for the magnitude of short circuit current at the end of line.
I have a question that, Why no source impedance has been included in the below equation from the Schneider cahier technique? If the source impedance is included, it would further reduce the short circuit current. So, I think source impedance to be included in the equation to determine the end of fault current.