On September 16, 2018 at 03:25, Nick-ISI said...
If they are wired in parallel then you cannot put an EOL on each leg and expect it to work correctly. In fact there is no termination method that will work correctly in this scenario and each device should be placed on its own zone with its own EOL placed at the detector.
If you use a EOL resistor 2x the normal value, then 2 circuits can be put on 1 zone in parallel and it works fine. i.e = 1KΩ is the EOL normally used, so put 2kΩ resistors at each detector.
That would get him down to only needing 3 zones for his 5 fire sensors. The increase in resistance would be enough to trip if 1 line went open.
Beyond that, you can use a zone expander if you really don't have enough zones to even get it down to that.
