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Smoke Detectors

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  • K k5054

    Why do smoke detector batteries always fail at 2:30 AM?

    D Offline
    D Offline
    dandy72
    wrote on last edited by
    #8

    Similarly, I used to say that a wireless mouse/keyboard's batteries always die an at inconvenient time. Until I realized there's no such thing as "a convenient time" at which a battery could die.

    L 1 Reply Last reply
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    • D dandy72

      Similarly, I used to say that a wireless mouse/keyboard's batteries always die an at inconvenient time. Until I realized there's no such thing as "a convenient time" at which a battery could die.

      L Offline
      L Offline
      Lost User
      wrote on last edited by
      #9

      you could mod and use your wireless mouse on a phone charging pad.

      Message Signature (Click to edit ->)

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      • K k5054

        Why do smoke detector batteries always fail at 2:30 AM?

        pkfoxP Offline
        pkfoxP Offline
        pkfox
        wrote on last edited by
        #10

        If you are in the UK they should be mains wired

        We can’t stop here, this is bat country - Hunter S Thompson RIP

        K M B K 4 Replies Last reply
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        • P Pualee

          Mine died when I wanted to sell my house ... I come home after multiple showings and 3 of them were chirping! Why then? Why did 3 start at the same time? If multiples fail at the same time, why didn't all of them fail at the same time? Very odd coincidence.

          M Offline
          M Offline
          Marc Clifton
          wrote on last edited by
          #11

          Pualee wrote:

          I come home after multiple showings and 3 of them were chirping!

          Some are wired together so that if one goes off, they all go off. Unfortunately, it makes it impossible to figure out which one needs the battery replaced.

          Latest Article - A 4-Stack rPI Cluster with WiFi-Ethernet Bridging Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802

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          • K k5054

            Why do smoke detector batteries always fail at 2:30 AM?

            S Offline
            S Offline
            Slacker007
            wrote on last edited by
            #12

            :laugh: :laugh: :thumbsup:

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            • K k5054

              Why do smoke detector batteries always fail at 2:30 AM?

              T Offline
              T Offline
              theoldfool
              wrote on last edited by
              #13

              smoke detectors? We don't need smoke detectors.

              If you can keep your head while those about you are losing theirs, perhaps you don't understand the situation.

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              • pkfoxP pkfox

                If you are in the UK they should be mains wired

                We can’t stop here, this is bat country - Hunter S Thompson RIP

                K Offline
                K Offline
                k5054
                wrote on last edited by
                #14

                I'm in Canada, and I'm not aware that I'm required to have smoke detectors at all in my residence, but I do get a break on my home-owners insurance for having them. I think maybe new builds are required to have wired detectors, but my house dates from the 60s, so it would require a retrofit in any case. Are you saying that a 15th C cottage in the UK needs to be retrofitted with mains wired smoke detectors? My battery operated smoke detectors have a sticker saying "replace in 2020", at which point I'm guessing the smoke-detecting ability has degraded beyond any usefulness. Assuming that wired-in detectors have the same issue, do you have a replaceable detection unit, or do you need to wire-in a new unit? Either way, will they start chirping in the middle of the night to let you know that the detector needs replacing?

                pkfoxP 1 Reply Last reply
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                • P Pualee

                  Mine died when I wanted to sell my house ... I come home after multiple showings and 3 of them were chirping! Why then? Why did 3 start at the same time? If multiples fail at the same time, why didn't all of them fail at the same time? Very odd coincidence.

                  M Offline
                  M Offline
                  Mark_Wallace
                  wrote on last edited by
                  #15

                  Did the ghosts follow you to your new house, as well?

                  I wanna be a eunuchs developer! Pass me a bread knife!

                  1 Reply Last reply
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                  • K k5054

                    Why do smoke detector batteries always fail at 2:30 AM?

                    Sander RosselS Offline
                    Sander RosselS Offline
                    Sander Rossel
                    wrote on last edited by
                    #16

                    This is a huge coincidence, but just last night I went to bed and I noticed the small light from the smoke detector (it's there, but I'm not very aware of it) and I thought to myself "That's been hanging there for years, when's the battery going to run out? Probably somewhere in the dead of night..." I've slept through smoke alarms in the past (luckily just my dad testing the alarm) :laugh: I'm about 10 years older now, so I'm not sure if I'd still sleep through it... Stress makes you sleep lighter :sigh:

                    Best, Sander sanderrossel.com Continuous Integration, Delivery, and Deployment arrgh.js - Bringing LINQ to JavaScript Object-Oriented Programming in C# Succinctly

                    K 1 Reply Last reply
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                    • L Lost User

                      you could mod and use your wireless mouse on a phone charging pad.

                      Message Signature (Click to edit ->)

                      D Offline
                      D Offline
                      dandy72
                      wrote on last edited by
                      #17

                      My mod was to get a wired mouse again. Hasn't failed me yet.

                      1 Reply Last reply
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                      • K k5054

                        Why do smoke detector batteries always fail at 2:30 AM?

                        K Offline
                        K Offline
                        Kschuler
                        wrote on last edited by
                        #18

                        Because the last time you replaced the battery was at 2:30 AM several months ago.

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                        • L Lost User

                          go for the zero power option: hang up some whistling kettles instead.

                          Message Signature (Click to edit ->)

                          M Offline
                          M Offline
                          maze3
                          wrote on last edited by
                          #19

                          Lopatir wrote:

                          go for the zero power option: hang up some whistling kettles instead.

                          That will do for the heat, I think you might want to splurge a bit a get a canary as well for the smoke.

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                          • pkfoxP pkfox

                            If you are in the UK they should be mains wired

                            We can’t stop here, this is bat country - Hunter S Thompson RIP

                            M Offline
                            M Offline
                            maze3
                            wrote on last edited by
                            #20

                            :wtf: :laugh: reading through the comments took me a moment to realise the nesting of the comments were seperate:

                            dandy72 wrote:

                            My mod was to get a wired mouse again.

                            pkfox wrote:

                            If you are in the UK they should be mains wired

                            1 Reply Last reply
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                            • M Marc Clifton

                              Pualee wrote:

                              I come home after multiple showings and 3 of them were chirping!

                              Some are wired together so that if one goes off, they all go off. Unfortunately, it makes it impossible to figure out which one needs the battery replaced.

                              Latest Article - A 4-Stack rPI Cluster with WiFi-Ethernet Bridging Learning to code with python is like learning to swim with those little arm floaties. It gives you undeserved confidence and will eventually drown you. - DangerBunny Artificial intelligence is the only remedy for natural stupidity. - CDP1802

                              B Offline
                              B Offline
                              BryanFazekas
                              wrote on last edited by
                              #21

                              Like others, when one battery fails I replace them all. I learned this lesson the first time it happened -- 3 smoke detectors failing within a week. This wasn't as bad as when the sensor in a CO detector failed. We got the babies out and I opened all the windows. Took an hour to find the documentation that said either the battery was failing, the sensor was failing, or we were going to die. Given that the battery tested good and we hadn't died, I was quite certain it was the sensor ...

                              E 1 Reply Last reply
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                              • B BryanFazekas

                                Like others, when one battery fails I replace them all. I learned this lesson the first time it happened -- 3 smoke detectors failing within a week. This wasn't as bad as when the sensor in a CO detector failed. We got the babies out and I opened all the windows. Took an hour to find the documentation that said either the battery was failing, the sensor was failing, or we were going to die. Given that the battery tested good and we hadn't died, I was quite certain it was the sensor ...

                                E Offline
                                E Offline
                                englebart
                                wrote on last edited by
                                #22

                                Most CO detectors have a built-in kill switch around 10 years because the sensors don't work anymore. Always write the install date on them.

                                B 1 Reply Last reply
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                                • E englebart

                                  Most CO detectors have a built-in kill switch around 10 years because the sensors don't work anymore. Always write the install date on them.

                                  B Offline
                                  B Offline
                                  BryanFazekas
                                  wrote on last edited by
                                  #23

                                  englebart wrote:

                                  Most CO detectors have a built-in kill switch around 10 years because the sensors don't work anymore. Always write the install date on them.

                                  You may have mixed up smoke and CO detectors. Smoke detectors are supposed to last 10 years (just replaced mine and the warranty including backup battery is 10 years). According to several handyman sites I checked, CO detectors last 5 to 7 years -- although my story took place 20 years ago and we had a failure at 3 years. I don't know if the CO sensors last longer now or if I had a defective one. Regardless of that, your advice to record when installation occurred is spot on! Beyond that, I'm now in the habit of writing the purchase date and where purchased on the user manual for everything that comes with a user manual. Anything that doesn't have a manual gets recorded in a small notebook, which goes in the filing cabinet along with product documentation.

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                                  • pkfoxP pkfox

                                    If you are in the UK they should be mains wired

                                    We can’t stop here, this is bat country - Hunter S Thompson RIP

                                    B Offline
                                    B Offline
                                    BryanFazekas
                                    wrote on last edited by
                                    #24

                                    I'm not sure if wired-in is a universal requirement in the USA, but it is in my county. Mine are wired in -- currently the backup batteries are typically warrantied for 10 years, after which the unit should be replaced.

                                    1 Reply Last reply
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                                    • K k5054

                                      I'm in Canada, and I'm not aware that I'm required to have smoke detectors at all in my residence, but I do get a break on my home-owners insurance for having them. I think maybe new builds are required to have wired detectors, but my house dates from the 60s, so it would require a retrofit in any case. Are you saying that a 15th C cottage in the UK needs to be retrofitted with mains wired smoke detectors? My battery operated smoke detectors have a sticker saying "replace in 2020", at which point I'm guessing the smoke-detecting ability has degraded beyond any usefulness. Assuming that wired-in detectors have the same issue, do you have a replaceable detection unit, or do you need to wire-in a new unit? Either way, will they start chirping in the middle of the night to let you know that the detector needs replacing?

                                      pkfoxP Offline
                                      pkfoxP Offline
                                      pkfox
                                      wrote on last edited by
                                      #25

                                      No, but if you have a rewire or anything that requires a certificate from an electrician they have to fit wired in smoke detectors

                                      We can’t stop here, this is bat country - Hunter S Thompson RIP

                                      1 Reply Last reply
                                      0
                                      • pkfoxP pkfox

                                        If you are in the UK they should be mains wired

                                        We can’t stop here, this is bat country - Hunter S Thompson RIP

                                        K Offline
                                        K Offline
                                        kalberts
                                        wrote on last edited by
                                        #26

                                        Here in Norway I have never seen anything but battery driven smoke detectors in private homes. And you are required to have at least one on each floor (in every housing unit if there is more than one). The smoke detectors are required to warn you long time before they run out of power; I believe the requirement is a minimum of two weeks. If you have more than one smoke detector, you are not required to interconnect them, but it is highly recommended. My previous set of detectors was made for wired interconnection, but before I got myself up to actually stretch the wires, the detectors were ready for replacement. My next (i.e. current) set of detectors don't need any wiring, they have wireless interconnection. There was some discussion, maybe a year ago, after lots of media reported on a study showing that you should never keep the door to bedroom open while you sleep: If there is a raging fire in the corridor outside your bedroom, a closed door can hold it back from your bedroom for the few second it takes you to escape from the bedroom e.g. through the window. But the study failed to point out that if your home is properly equipped with interconnected smoke detectors, you would be awakened by a siren several minutes earlier, with a fair chance to stop the fire before it develops, and certainly before the raging flames reach your bedroom door. ... So I still sleep with my bedroom door open!

                                        1 Reply Last reply
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                                        • Sander RosselS Sander Rossel

                                          This is a huge coincidence, but just last night I went to bed and I noticed the small light from the smoke detector (it's there, but I'm not very aware of it) and I thought to myself "That's been hanging there for years, when's the battery going to run out? Probably somewhere in the dead of night..." I've slept through smoke alarms in the past (luckily just my dad testing the alarm) :laugh: I'm about 10 years older now, so I'm not sure if I'd still sleep through it... Stress makes you sleep lighter :sigh:

                                          Best, Sander sanderrossel.com Continuous Integration, Delivery, and Deployment arrgh.js - Bringing LINQ to JavaScript Object-Oriented Programming in C# Succinctly

                                          K Offline
                                          K Offline
                                          kalberts
                                          wrote on last edited by
                                          #27

                                          Sander Rossel wrote:

                                          I've slept through smoke alarms in the past (luckily just my dad testing the alarm) :laugh:

                                          An alarm located in the same room as you were sleeping? Are you sure that smoke detector satisfies the requirements for sound pressure level? If your daddy's testing was just a quick press of the test button, causing a short sound of a second or two, I certainly believe that a kid in deep sleep may not wake up. But if it goes on, has the required intensity, and the alarm is located in the room where you sleep, then if you don't wake up and I was you dad, I would certainly get you awake and get out of you how many beers you had last night :-)

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