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29.9.9 Secondary (Standby) Non-Battery Power Source
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Where alarms include a secondary power source (non-battery), the following conditions shall be met:
- The secondary power source shall be supervised and shall cause a distinctive audible or visible trouble signal upon depletion or failure.
- A distinctive audible trouble signal shall be provided before the power source is incapable of operating the device(s) for alarm purposes.
- At a power source condition at which a trouble signal is obtained, the power source shall be capable of producing a fire alarm signal for at least 4 minutes or a carbon monoxide alarm signal for at least 12 continuous hours, followed by not less than 7 days of trouble signal operation.
- The audible trouble signal shall be produced at least once every minute for 7 consecutive days.
- A rechargeable secondary power source shall meet the following criteria:
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