If there is a break in a single-wire continuous-loop fire detector element, and the system tests bad, will it indicate the presence of a fire?

• A. Yes, it will indicate the presence of a fire.
• B. No, it will not indicate a fire.
• C. Only if another detector also detects heat.
• D. It will indicate only during maintenance.

Answer: (A)

In a single-wire continuous-loop fire detector system, the loop is continuously supervised for integrity. If there’s a break, the circuit becomes open and the system detects a fault. To ensure a potential fire isn’t missed due to a wiring fault, many designs treat any loop fault as an alarm condition, sounding the fire alarm to alert occupants and responders. So even though there isn’t an actual flame signal, the fault condition causes the system to indicate fire presence. This behavior prioritizes safety by ensuring a fault on the detector loop doesn’t go unnoticed.