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Old 06-26-2016, 02:57 PM   #1
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Battery back up smoke alarms


In what states are battery back up smoke alarms mandated?

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Old 06-26-2016, 04:02 PM   #2
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Just about everywhere that hardware smoke alarms are mandated. Every hard wire system I have ever seen has a 9v battery in every alarm/sensor so that it will work if there is no power so I do not believe you need a second system. In commercial venues the rules are very different

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Old 06-26-2016, 04:31 PM   #3
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Re: Battery back up smoke alarms


Part of this is going to be based on the year of construction.
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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