Replacing battery in hard wired smoke detectors

caw12394555July 27, 2014

My new smoke detectors have a battery back up, even though they are hard wired. Do I have to turn off the power to them to replace the battery?

Thank you for reporting this comment. Undo

No. Are you afraid of a shock? They're low voltage.

    Bookmark   July 27, 2014 at 2:43PM
Thank you for reporting this comment. Undo

The batteries are low voltage - the smoke detector is 110.

When you take the smoke detector off the mounting, you will need to unplug the wires that go into the detector. For most designs, the wires have to be unplugged before you can access the battery. The plugs are designed to not expose any AC power.

I never turn off the power to mine when replacing the batteries.

    Bookmark   August 6, 2014 at 1:21PM
Thank you for reporting this comment. Undo
Ron Natalie

Say what? I've never seen a smoke detector like kayakboy describes. Most these days have an separate battery compartment that doesn't involve removing the smoke detector. Even those that don't you don't have to disconnect anything to remove it from the base plate to change the battery, you can just leave it dangling by the supply wires. The 110V area covered up so there's no problem doing so live.

    Bookmark   August 6, 2014 at 1:27PM
Thank you for reporting this comment. Undo

ronnatalie is correct. When I said they were low voltage, I was thinking of the ones I have that are wired into my security panel, but there are plenty that run off of 110V. However, there are no exposed wires in the box they are mounted on. Even if you have to remove a 110V detector to replace a defective one, there is typically a two-part plastic harness that wire-nutted to the power; the harness snaps apart and you can usually get a replacement unit that snaps into the old harness. I have had battery-only detectors that required dismounting, but all the hard-wired ones I've had experience with always have had a little battery access door on the outside.

    Bookmark   August 6, 2014 at 2:28PM
Sign Up to comment
More Discussions
1 of 2 security light bulbs keep going out, do i need a new light?
I have a security light fixture in my carport that...
Humming Transformer
Last summer the POCO replaced the transformer on the...
Inspection Report
Had a gorgeous 1909 house inspected yesterday and don't...
Can I electrify battery-operated lights?
Hi all. Is there a way to electrify a battery operated...
Subpanel Question
I have a 100 amp panel being fed by #4 awg copper wire I...
Calo Renovations
Sponsored Products
Bronze Finish 13" Wide 2-Light Motion Sensor Security Light
$59.91 | Lamps Plus
Solar Motion Sensor Security Light
Heath Zenith Other Lighting Wireless Motion Activated Alert Set SL-6019-WH
$34.98 | Home Depot
Blackout Buddy with CO Detector
$60.00 | FRONTGATE
White 3-Light Motion Sensor Security 19" Wide Outdoor Light
$74.91 | Lamps Plus
Outdoor Lighting. Seville Wall-Mount Outdoor Bronze Carousel Motion Light
$54.97 | Home Depot
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™