Fault detected by upstream device

What does Fault - ZSI related mean?

An upstream device has detected a fault. Depending on the settings, this may cause a delay in tripping to allow downstream devices to clear the fault.

• A fault has occurred at point A or B in the system.
• Incorrect ZSI settings (tripping delays set to zero).

Click steps to track your progress.

1. 1

   Check the wiring connections for the Zone Selective Interlocking (ZSI) system.

2. 2

   Verify that the short-time and ground-fault tripping delays are not set to zero.

3. 3

   Use the portable test kit to check the wiring and operation of the ZSI system.

4. 4

   Consult the technical appendix for specific ZSI fault handling.