FC A Basic Alarms Practice Test

Which fault types should be used to test a supervised loop's fault reporting capability?

Open fault only Short circuit only Both open and short faults No fault types, only power reset

Correct Answer:

Both open and short faults

Explanation:

In a supervised loop, the fault reporting capability must detect any interruption in the loop’s electrical path and raise a fault. To verify this, you need to test both scenarios: an open fault, where the circuit is broken and continuity is lost, and a short fault, where an unintended low-impedance connection alters the path. If you test only one type, you could miss faults of the other kind, leaving the system unaware of real problems. Testing both open and short faults confirms that the fault reporting mechanism responds correctly to all fault paths, ensuring reliable safety signaling. Testing with no fault types wouldn’t exercise fault detection at all, and testing only a power reset wouldn’t validate fault reporting.

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