View Full Version : End of line resistor
readykilowatt
Apr 7, 2010, 01:09 PM
Does anybody know what an end of ljne resistor does in a fire alarm system?
tkrussell
Apr 7, 2010, 01:12 PM
If you use the Search tool, you will find this:
https://www.askmehelpdesk.com/electrical-lighting/purpose-behind-resistors-274767.html
stew_1962
Apr 11, 2010, 06:48 PM
It is used to induce a trickle current in the alarm loop. That way, the alarm panel can detect the wire being loose, broken, or melted during a fire and trip the alarm.
Stratmando
Apr 12, 2010, 05:35 AM
The Resistor used as an end of line resistor is needed to show an intact circuit, without it, if you had a short, open or fault across the pair, it would not be seen without the resistor. It MUST be within a couple of hundred ohms(more or less depending on Panel) or it will show as a fault.