The Arc Flash Hazard report shows upstream devices that do not exist on the one-line
There are two ways this can happen:
- Bus Data has user-defined trip times.
- Bus Data has pre-defined fixed times. The trip times specified in the library are used. Based on the voltage of the faulted bus, you could see the following in the column Upstream Trip Device Function:
LV Bus |
MV Bus |
---|---|
INST |
50 |
ST-MIN |
51-MIN |
ST-INT |
51-INT |
ST-MAX |
51-MAX |