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Hi Thanks - bit late I have ordered my two new ones Dicon and will replace the others at the 10 year mark. I have not yet taken the existing down to check for makes. They were put in by the builders. Thanks Marchant

If they do not link during power cut, this would be stated on the instructions - surely. I have the instructions for one of the existing and the new alarms and both say not to link with other manufacturers but they may say that anyway! One quick test last night was to look on the link wire...

But with mains failure it would be not be mains. Or AC, so must be DC, the earth could be used - why not? I will have a few experiments tomorrow. Thanks Marchant

hi Thanks for the reply. Think I will leave i it as two separate linked systems. Marchant Yes I agree it must be 9v or less. I could test the voltage when on and see if they happen to be 9v! or all the same.

Hi Thanks for the reply. I don't want the new alarms to destroy the existing alarms. How does this link wire work? What voltage are we talking about? Thanks Marchant

Extending existing linked smoke alarm system I have an existing mains powered [battery backup]smoke alarm system with 3 alarms linked. They are powered from one supply from the consumer unit. My question I want to add two more mains [battery backup] smoke alarms. I can link...