Crossed Up Wiring On Smoke Alarm

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Electricians reading this might be as puzzled as I was when I first took the cover of this old reported as faulty domestic smoke alarm/detector. Yes the Red and Black cables which look to be the feed are the live and neutral from the nearby lighting circuit.  I did wonder if this detector had actually ever worked wired like this. It was supposed to be paired with another one.  I changed them both for new maintenance free types and briefed the home owners how to test and look after them. Job done.

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