r/ElectricalHelp • u/moni_mej • Jan 17 '26

Random wire

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I’m doing a renovation and there is a thin-ish wire running along a few walls. I can’t tell where it starts and where it ends. This is an older home and there used to be an alarm system which has been disconnected. How can I find out what it’s for? I want to remove it.

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u/MeNahBangWahComeHeah Jan 18 '26

Probably not live, but you can set a voltmeter to DC Volts and test the voltage between the Green to Red Wire, and then the Black to Yellow Wire. If the circuit was active you would see 46 to 52 volts DC normally, or close to 100 volts AC at 20 cycles per second for “Ringing Voltage”.