I have a house with four smoke alarms all interconnected together. Each smoke alarm is hard wired and also has a battery backup. I have recently replaced to batteries in the alarms and when I connected the fourth alarm, they all start sounding. With three connected, it's not an issue but as soon as I connect the fourth, all tell breaks loose.
Now, I have swapped the smoke alarms around and it doesn't matter which alarm I use, it's always the same location that causes the problem.
I have then used a fluke meter to take a reading across the live and neutral wires. If the positive lead is connected to the live, and the common lead is connected to the neutral, then it will set off the other alarms. Now here's the weird bit, if I reverse my test leads so that the common is connected to the live wire, and the positive lead is connected to the neutral, then the alarms do not sound......
The reading in both cases on the fluke meter is 240v, but I don't understand why one way would trigger the alarm.
Over to anyone who can help......
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