EOL End of Line Resistors
Security systems and fire alarm panels use end of line resistors in order to supervise the alarm/fire zone. This means the alarm/fire panel can detect a problem like a short circuit where someone may have tampered with the zone or lets say a nail through drywall has caused a short. EOL resistors can be used with "normally open" or "normally closed" zones. Check the panel manufacturer's wiring diagram and eol resistor specifications as applicable.
- Without the EOL resistor the zone may always show as secure even if the wiring is shorted.
- End of line resistors ONLY work effectively if they are installed at the end of the circuit where the last device on the circuit is installed.
- The EOL resistor must be installed at the end of line as it only "protects" from where it is installed back to the panel.
- If the EOL resistor is installed at the alarm/fire panel it will not do its job.
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