How to Install Smart Smoke and CO Detectors | Ask This Old House

Ask This Old House master electrician Scott Caron installs smart smoke and carbon monoxide detectors.

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Cost: $120 per device

Skill Level: Moderate

Tools List for Installing Smart Smoke and CO Detectors:
Cell phone
Flathead screwdriver

Shopping List:
Smart smoke and carbon monoxide detectors
Wire nuts

Steps:
1. Before any electrical work, always shut the power off at the main breaker.
2. Program each smoke and CO detector following the instructions via the app. You can label each one by room description (kitchen, living room, etc.)
3. Remove the old smoke detector from the ceiling with a flathead screwdriver. Hold on to the screws to reuse for the new plates.
4. Cap the existing interconnect wire with a wire nut as it will no longer be needed.
5. Connect the pigtail provided by the manufacturer to the house’s power supply. Cover with a wire nut.
6. Install the new mounting plate to the electrical box using the flathead screwdriver and the existing screws.
7. Plug the smoke and CO detector in, then snap it into the mounting bracket.
8. Repeat for all rooms in the house.
9. Turn the power back on and test each device using the “test” button.

Resources:
Scott installed the Nest Protect smart smoke and carbon monoxide detectors manufactured by Nest (https://nest.com ), and available at home centers and through their website.

All the other materials for this project, including the wire nuts and the flathead screwdriver, can be purchased at most home centers and electrical supply houses.

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How to Install Smart Smoke and CO Detectors | Ask This Old House
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