I have smoke detector/co2 wired to the house. I have a total of 3. I found an orange wire tucked into the conduit and am not sure what it is for. I discovered it because I have to add a 10 inch wall plate to cover the drywall being cut a bit to big. I was able to pull the wire out and it is connected to something because it did not come out when I pilled it. Other detectors had it also. Any ideas??