What is an End-of-Line (EOL) resistor, and why is it used?

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Study for the Fire Alarm Lesson 5and6 Test. Prepare with flashcards and multiple choice questions; each question comes with hints and explanations. Gear up for success on your exam!

Multiple Choice

What is an End-of-Line (EOL) resistor, and why is it used?

Explanation:
End-of-Line resistors provide a known impedance at the end of a signaling loop so the control panel can continuously monitor the line. With this reference value, the panel expects a normal resistance when the circuit is intact. If the wiring opens or a short occurs, the resistance changes and the panel detects a fault on the line. This makes it possible to supervise circuit health and catch faults early. It isn’t a power supplier, it isn’t optional in monitored systems, and it isn’t used to terminate lighting circuits.

End-of-Line resistors provide a known impedance at the end of a signaling loop so the control panel can continuously monitor the line. With this reference value, the panel expects a normal resistance when the circuit is intact. If the wiring opens or a short occurs, the resistance changes and the panel detects a fault on the line. This makes it possible to supervise circuit health and catch faults early. It isn’t a power supplier, it isn’t optional in monitored systems, and it isn’t used to terminate lighting circuits.

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