The time required for the task depends on the layout of your home. In addition, you'll need to tie in to a single source of power. Expect to spend about 5 hours to run cable and install three detectors. You'll need to know how to install boxes, run cable into boxes, and strip, splice, and connect wires to terminals.
More Tips for a Safer Home. For each detector, cut a hole for a standard 4-inch octagon or single-gang box. The yellow lead from each detector interconnects the system so all detectors sound at once. Install the boxes. 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. Red circuit wires connect to the traveler wire, which is usually yellow. Now, you are ready to plug the wire harness into the back of the alarm, install the backup battery, and attach the smoke detector to the mounting plate.
To do so, line up the notches on the mounting surfaces, twist the alarm, and make sure it is locked in place and secured on all sides. Then restore the power source and test the alarm. We are the leading Los Angeles smoke detector installation, repair, and replacement company.
Our experienced technicians can save you the time and hassle of DIY installation. They ensure your detectors are installed properly and will work when needed.
Our expertise is in hardwired smoke detector installation. Call to learn more or schedule service. Save my name, email, and website in this browser for the next time I comment. We guarantee same day response time for requests for emergency electrical services received before noon, Monday through Saturday; our service within 60 minutes guarantee is subject to availability of electricians, and unless we have advised you at the time of the service call of a delay, if we do not arrive within 60 minutes of the end of our call with the Customer, the initial service call fee will be waived.
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How to Install a Hardwired Smoke Detector Installing a hardwired smoke detector is an essential and required safety feature for protecting your home or building. Installing Hardwired Smoke Detectors A licensed electrician can easily install a hardwired smoke detector. Disconnect the Old Smoke Alarm If you have one in place, use the voltage tester to verify the power is off, and then mark or sketch where the existing wires go.
Mark Where the Smoke Detector Box Will Go With the stud finder, locate the ceiling joists or wall studs, and draw an outline of the perimeter of the electrical box.
Cutting into the Drywall Cut an opening in the drywall, where the electrical box for the smoke detector will go. Insert the Cables The cables must be inserted into the electrical box with about 8 inches of wire extending into it. Beginning at the first smoke detector box location, run 3-wire cable with ground to each subsequent smoke detector. 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.
Again, leave plenty of excess cable extending through the holes in the drywall. At each box location, first cut away the excess cable so that about 8 inches of wire will extend into each electrical box. How the cables are clamped into the boxes will vary, depending on the type of box you are using. With some metal boxes, you may need to install a cable clamp in knockout openings on the box, while other types have internal clamps that hold the cables.
With cables secured in each box, install each old-work box into the opening in the drywall. Tighten the screws in the box, which will draw the retaining tabs up tight against the back of the drywall, securing it in place.
At each smoke detector location, feed the circuit wires through the detector's mounting plate. Then, align the screw holes on the mounting plate with the holes in the electrical box, and use the included screws to secure the plate to the box. In the first box, using wire nuts or other UL-approved wire connectors to connect the wire leads on the smoke detector:. Carefully tuck the wires through the mounting plate, then secure the smoke detector to the mounting plate, following the manufacturer's directions.
For most detectors, you will need to slide notches on the detector into slots on the base, then twist to secure the body of the smoke detector to the mounting plate. Connection methods for smoke detectors vary from model to model, so make sure to follow manufacturer's directions.
On some models, the wire connections are made to a mounting plate that has socket into which the smoke detector is plugged. On other models, the wire connections are made directly to the smoke detector. Insert the battery into the smoke detector, aligning positive and negative terminals in the correct configuration. Replace the cover. The trickiest part of the installation is connecting the feed cable that brings power to the first smoke detector to its power source.
This is where some DIYers may choose to have a professional electrician make the hookup. If you are feeding the smoke detectors off an existing outlet or light fixture circuit, this connection is made by turning off the circuit and testing for power, then opening an outlet, light switch, or ceiling fixture box and pigtailing into the circuit wires to join the smoke detector cable to the circuit.
It's important, though, that you splice into circuit wires that are not controlled by a wall switch. This means that if you are splicing in at a light fixture box, it must be a box where there are pass-through wires that are not controlled by a wall switch.
If splicing in at a wall switch, you must connect to the black feed wire that feeds the switch, not the outgoing wire that brings power to the light fixture. If you are installing a new circuit, the feed connection involves installing a new AFCI-protected circuit breaker to feed the smoke detectors. Turn on the power to the circuit, then test the smoke detectors by pushing the test button on each detector, one at a time.
If they are operating correctly, all alarms should sound when each test button is pressed. Hardwiring smoke detectors is an advanced electrical project that has a direct impact on your safety. If you feel at all uncomfortable about your ability to install these devices, call a licensed electrician for assistance.
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. Effectiveness of Home Fire Safety Interventions. A Systematic Review and Meta-analysis. PLoS One. Published May Actively scan device characteristics for identification.
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