Installing Smoke Detector Electrical Wiring

When installing a heat sensor/smoke alarm in kitchen, and 2 additional smoke alarms in hallway…

Electrical Question from Rob about Smoke Detectors
Background: Rob, a Homeowner from Doncaster
Question: When installing a heat sensor/smoke alarm in kitchen, and 2 additional smoke alarms in hallway, is it ok to run 1.5mm 3 core and earth from consumer to kitchen alarm and then 1.5mm twin and earth from kitchen alarm to next two?

Dave’s Reply:
Thanks for your electrical question Rob. It is typical for newer installations of smoke detectors to be connected in series so that if one goes into alarm, they all do.

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