smoke detectors are required by the residential electrical code nearly everywhere, and for good reason: research demonstrates that smoke detectors save lives and property by alerting occupants to early, smoldering fires. the electrical cable provides power to the smoke detector all the time, except in the event of a power failure. then, a 2-wire cable is run from the power source to the first smoke detector. with a drywall saw, cut openings in the drywall to hold the electrical boxes for the smoke detectors.
the extra wire in these cables allows the smoke detectors to “talk” to one another, so that all detectors will sound the alarm when any of them detect smoke or fire. on some models, the wire connections are made to a mounting plate that has a socket into which the smoke detector is plugged. if you are installing a new circuit, the feed connection involves installing a new afci-protected circuit breaker to feed the smoke detectors. homeowners who feel quite comfortable installing the electrical boxes and running the cables may still want to hire an electrician for the hookup to the power source, especially when it involves connecting to a new circuit breaker at the main service panel.
while it’s best practice to change the batteries in the smoke detector every six months, having one hardwired into the home electrical system ensures you’ll never be without a working smoke detector. the electrician will determine which existing circuit the smoke detectors will be wired into and turn off the power supply to that circuit. from the power source, the electrician will run wire (with ground) to the location of the smoke detector. this ultimately makes installation easier, and your electrician will trim the wire to the proper length when installing a hardwired smoke detector.
at each smoke detector location, the electrician will feed the circuit wires through the detector’s mounting plate and align the screw holes on the mounting plate to the hole in the electrical box. finally, the electrician will pigtail the wires into the circuit and join the smoke detector cable to the circuit. we would also love to discuss the option of using smart smoke detectors, to keep you connected and your home protected at all times. when you want electrical repairs or installations at your home, you need a professional electrician you can trust to do the job right. if you are a resident of or want to locate a franchise in one of these states, we will not offer you a franchise unless and until we have complied with applicable pre-sale registration and disclosure requirements in your state.
wiring the smoke detectors is fairly straightforward for an experienced diyer or a professional electrician. first, old-work electrical boxes step 1: turn off the power step 2: cut the holes step 3: run the wire step 4: attach the wires to the electrical boxes step 5: secure the electrical boxes. run 14-2 nm cable (a sheathed cable with 2 wires and a ground wire) from the house breaker panel to the smoke alarm closest to the breaker panel., 3 wire smoke detector wiring diagram, smoke alarm wiring, smoke alarm wiring, 4-wire smoke detector wiring diagram, smoke detector wiring diagram pdf.
when making the connections, black wires should be wired together, and white wires should be wired together. any red wires should be connected to install hard-wired smoke detectors, light fixtures, or dimmer switches, you usually have to connect solid wire to “stranded” wire, which is replacing a hardwired smoke alarm is a piece of cake. learn how from a veteran home inspector in this story., 2-wire smoke detector wiring diagram, smoke detector wiring code.
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