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Back in 2012 on a retrofit in an old Boston brownstone, I nearly set off the whole system.
I was swapping out a legacy keypad for a new touchscreen model. The old wiring was a mess of cloth covered stuff, and I was sure I had the right zone. I touched a wire to the common terminal and the whole panel started beeping like crazy, showing a trouble on a fire zone I didn't even know was still active. Turns out the old fire loop was still wired in and my probe had shorted it. I had to call the monitoring station fast to put them on test, then spent the next hour with a toner tracing out every single wire in that dusty basement to map it properly. The homeowner was not happy about the noise. Ever since then, I never trust an old panel diagram without physically checking every circuit first. Anyone else have a story about a surprise fire zone causing a headache?
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milessmith1mo ago
Man, I gotta be honest, I see that totally different. That kind of check is just basic work to me, like putting on your safety glasses. You should always assume an old diagram is wrong before you even pick up a screwdriver. Touching wires without knowing exactly what they are is asking for trouble, fire zone or not. That beeping panel was just the price of skipping a step, you know?
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the_nathan1mo ago
Our old plant diagrams were right more than they were wrong though.
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