I am seeking some technical advice regarding the operational logistics of fire alarms in residential homes, particularly new homes which require them to be hard wired. As I am living abroad at the moment I have no availabiliy to technical/electrical advice, and I dare say my real estate agent has no idea either, so please if there is any blogger who has alarm/electical knowledge please respond.
Our house is around 2 years old (rented out), and has alarms installed by law, and hard wired also by law. I recently found out that one of the alarms went off in our house, not due to smoke. The Tenant could only stop the beeping, by removing the battery. I originally was of the opinion that hard wired smoke alarms are solely that, hard wired, but after this occurance in our home, I am a little confused.
Would I be correct in my latest assumption, that hard wired smoke/fire alarms actually run off a battery, and are backed up by the mains, and that when the battery is running low, then the mains kick in (and set the alarm off) in order to “alarm” the resident that the battery is flat. Apparently, the alarm was fine again (silent) when the old battery was removed and a new one replaced.