12 Volt Smoke Detector 4 Wire - A hardwired smoke alarm installation involves wiring one of the smoke detectors (closest to the voltage source) to a 120 vac breaker in the main electric panel or tapping from a 120 v electrical box, wiring it using a 14/2 cable with a black (live), a white (neutral), and a ground wire, as shown by the.
12 Volt Smoke Detector 4 Wire - A hardwired smoke alarm installation involves wiring o…