TEJATC Fire Alarm Practice Test 2025 – The Complete All-in-One Guide to Exam Success!

The monitoring for the integrity of Initiating Device Circuits (IDC) and Notification Appliance Circuits (NAC) is effectively accomplished using an End-of-Line (EOL) resistor. This resistor is placed at the end of a circuit to ensure that the wiring has not been compromised. When the circuit is intact, the EOL resistor allows the fire alarm control panel to detect the correct resistance within the circuit, indicating that the system is functioning properly. If there is a break in the circuit or if the wiring is tampered with, the resistance changes, alerting the control panel to a fault condition. This method provides continuous supervision of the integrity of the circuits, allowing for quick identification of any issues that may affect the operation of the fire alarm system.

While other methods such as manual checks, alarms, and visual inspections can provide some level of monitoring, they lack the automatic and consistent feedback that the EOL resistor system provides, making EOL monitoring a crucial component of fire alarm integrity checks.