How are intermittent faults in continuous loop fire detection often located?

• A. By performing a thermal test
• B. By replacing the detector
• C. By moving wires to recreate the short
• D. By measuring resistance

Answer: (C)

Intermittent faults in a continuous loop fire detection are usually caused by a wiring issue that only shows up under certain conditions, such as movement or vibration. The best way to locate them is to recreate the fault by moving or flexing the loop wires and connectors. When you provoke the same fault, you can observe which portion of the loop changes state or causes the fault indication, allowing you to identify the suspect section for inspection and repair. This approach works better than thermal testing, which checks detector response to heat, or replacing a detector, which doesn’t reveal where the intermittent fault is located. Measuring resistance can miss an intermittent condition because the fault isn’t present consistently, so it won’t reliably point to the exact source.