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What is a "proper power failure alarm"? I was planning to use detectors with 9v battery backup.

I am after some advice regarding smoke/heat detector circuits as I want to install a circuit whilst my house is being rewired. I was panning to power 8 detectors on there own mains circuit from a 6A 30mA RCBO in the consumer unit. I would then run 1.5mm twin and earth from the consumer unit...