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It means 'End Of Line'.

In a fire alarm system (usually conventional systems use this technique) a resistor is placed at the very end of the fire alarm circuit at the last device. This device could be a Manual Call point, Sounder, Bell Smoke/Heat detector, strobe etc. This then enables the panel to monitor the circuit. For example, if the resistor is moved or disconnected, then it will show up as a fault on the panel, giving indication the something has gone wrong in the system and that it needs to be fixed. Not all EOL's are resistors though. They can also be capacitors or diodes from what we know.

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