In the example below, notice that the available fault current at BUS-10 is 32.113 kA.
The interrupting rating of BL-18 (GE THHQB) is 22 kA, which isn't enough for this fault current.
The upstream breaker is BL-4 (GE Spectra), shown below.
To see if we can use series rating for BL-18, we need to look in the library. First, select the upstream breaker type from the left of the library.
Then select the Series Rated Devices
tab and locate the downstream breaker type.
The combination of the two breakers can handle up to 65 kA of fault current. To apply this to BL-18, we need to open the Short Circuit
tab of BL-18, select Series.
Then click Calculate
and a message is displayed confirming the selection.
to save the new rating. Device duty uses this value to create reports. 65 kA is high enough to handle the short circuit current.