In some areas, hardwired smoke detectors that include battery backup are required, so check local codes before deciding what type of detector is best for your home. If you choose hardwired detectors, know that running the cable is the hardest part of the job. The time required for the task depends on the layout of your home. In addition, you’ll need to tie into a single power source. Expect to spend about 5 hours running cable and installing three detectors. You’ll need to know how to install boxes, run cable into boxes, and strip, splice, and connect wires to terminals.
What You Need
Voltage testerDrill1/2-inch bitDrywall sawFish tapeScrewdriverStrippersLong-nose pliersLineman’s pliersSmoke detectorsBoxes14/2 and 14/3 cableElectrician’s tapeWire nuts
Step 1: Install Boxes
For each detector, cut a hole for a standard 4-inch octagon or single-gang box. Run 14/2 cable to the first detector in the series and 14/3 cable to the others. The yellow lead from each detector interconnects the system, so all detectors sound at once. Install the boxes.
Step 2: Align and Attach
Align the slots of the mounting plate and attach the plate to the box. Gently pull the wires through the plate. After connecting the first box in the series, connect wires as shown.
Step 3: Connect to Power
After securing the wire nuts with electrician’s tape, gently push the wires into each box. Install the detectors, activate the backup batteries, and connect to the power source.
Bonus: Install a Plug-in Carbon Monoxide Alarm
Carbon monoxide, an odorless, colorless, poisonous gas, results from combustion. Faulty venting for appliances, wood or charcoal burners or the incursion of auto exhaust can put your household at risk. Plug-in units have a battery backup and help protect you and your family from harm.
