Hello to all, I was called to help someone with their fire alarm that had been going all night. When I got there I found two alarm glasses broken and wires disconnected from the fused junction box feeding the alarm unit, turns out they had a bit of a party :roll: :shock:
I jammed the pins back up in the glasses so that I could silence the alarm. Checked the wiring with a non contact tester which proved there was a live feed but when I used a test lamp across L and N there was no light and same to earth. I noticed there was black around the live terminal as if they had touched to earth (maybe the party had a touch of the Major Tom about it :wink: ) anyway could someone enlighten me to the problem and a solution into the bargain. Oh and yes I did prove the test lamp.
The fire alarms I have worked on have resistors and are neither open or closed circuit but a resistance to the control panel that way the panel can detect tamper.
I will guess each make is different but this is really a specialist subject.
Ye thanks Eric, solved the problem, just evicted the tenants and bingo :wink:
All back together and working, thanks again.
Not sure why but the live feed was showing as live with the non contact tester, could have been a number of factors. Traced through the spaghetti to the fuse which had blown. Replaced, connected, switched on the fuse box and viola mains power restored.
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