A hard-wired smoke detector is one that is connected to the home's main electrical system. Over time, the detector can gather dust, have a power surge or simply malfunction, resulting in false alarms or a steady chirping noise. Hard-wired detectors also contain a backup battery which, over time, can die.
Are smoke detectors required to be hard wired?
Homes built before 1992 generally aren't required to have hardwired smoke detectors. However, they still need to have smoke detectors installed, although battery-powered ones are adequate. Homes built in California after 1992 must have hardwired smoke detectors that also have a battery backup.
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