This is my understanding of the situation & may not be totally correct. At some stage in the past the regulations changed in such a way as to make most security system smoke detectors non compliant. I think it was either because there was no on-board sounder or no on -board secondary power or a combination of both. It was determined that a fire would disable both main & backup power as they both were delivered over the same cable. At the same time Bosch discontinued the availability of wireless smoke detectors (presumably because of the lack of on-board sounder)
There are now a number of security smoke detectors that are compliant (Brooks etc) and as far as I know can constitute a legally compliant fire detection system (at domestic level) I know Chubb used to get a signature authorising them to call the fire brigade and that the owner would pay any costs in the event of a false alarm. The advantage of a smoke detector on the security panel is that the result is a bit more effective than the mozzie squeak that comes from a $6 Kmart smoke detector especially if there is no one at home to hear it.
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