An end-of-line resistor (EOL) is installed at the far end of an initiating-device circuit (IDC) for the purpose of?

An end-of-line resistor (EOL) is installed at the far end of an initiating-device circuit (IDC) for the purpose of?

• A. Monitoring for circuit integrity
• B. Providing power to devices
• C. Limiting fault currents
• D. Resetting device status

Answer: (A)

End-of-line supervision is about watching the wiring of an initiating-device loop. Placing a resistor at the far end gives the control panel a known load to measure. When the loop is intact and devices are in normal status, the panel sees the expected resistance. If a wire opens or a short occurs anywhere on the run, the resistance changes outside the expected range, and the panel flags a fault. That’s why monitoring for circuit integrity is the purpose of an end-of-line resistor. It isn’t meant to power devices, and while it does influence current in fault conditions, its primary role is supervision so the panel can reliably detect wiring problems rather than simply limiting current. It also doesn’t reset device status; device status changes are driven by their own circuits and inputs.

End-of-line supervision is about watching the wiring of an initiating-device loop. Placing a resistor at the far end gives the control panel a known load to measure. When the loop is intact and devices are in normal status, the panel sees the expected resistance. If a wire opens or a short occurs anywhere on the run, the resistance changes outside the expected range, and the panel flags a fault. That’s why monitoring for circuit integrity is the purpose of an end-of-line resistor.

It isn’t meant to power devices, and while it does influence current in fault conditions, its primary role is supervision so the panel can reliably detect wiring problems rather than simply limiting current. It also doesn’t reset device status; device status changes are driven by their own circuits and inputs.