2392 Question - Balanced prospective short circuit current between lines

[rustynails]

The prospective short-circuit current between line and neutral is measured at 900A. The maximum balanced prospective short-circuit current level between lines, as a rule of thumb, can be assumed to be approximately:

A: 0.9 kA
B: 9 kA
C: 90 kA
D: 1.8 kA

:banghead:

 

[johnboy6083]

its 1.8kA

In reality, between 2 phases it will be the PSCC between L&N x 1.732

The reason we are taught to multiply by 2 is to account for a possible short between all three phases at once.

 

[Strima]

A= Amps
kA= Kiloamps

So convert amps to kiloamps and if you have GN3 there's a hint about three phase PSSC in there.