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Do fire alarms work without power?

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Generally speaking, no. Let's start with detectors. Smoke detectors can be stand alone, or part of a system. But all smoke detectors require power to function. A smoke detector may or may not have a built in alarm (sounder), again, requires power. Stand alone or 110 volt detectors have a battery backup. read more

This interpretation doesn't sound feasible. The fact is that just installing a fire alarm does not guarantee safety from fire breaking out in the house. read more

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