New answers tagged alarm
If your careful how you splice you can use the 4 conductor wire as you're guessing, send 2 wire out on red/black, bring it back to the panel on green/white... Send it out to the next detector on red/black... Etc etc, rinse and repeat for 10 detectors. The end of line resistor would then go across the last green/white. That essentially converts your 4 wire ...
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