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I've been doing some work trying to identify all my circuits in my house (the box was not labelled. Can you believe it?), and there's one circuit I couldn't figure out. It drove me crazy for days until I realized that it ran up into the ceiling to a weird looking device with two metal discs sticking out of the center.
With the circuit off, I removed the cover to reveal a somewhat beefy stepdown transformer and a lot of pigtailed wires. Unfortunately I still have no idea what this
thing is or why it would have its own circuit.
It's definintely not my doorbell. It's in the center of the boiler room ceiling. I don't think
it's lighting-related because the two discs are on the same post and they arent isolated from each other (not like a screw post). I don't have a security system, but that doesn't mean the hardware isn't in the house. Maybe it's a fire detector or something?
I've had a lot of fun tracing wiring and circuits and trying to figure out what everything goes to, and is. House is one thing but try a church or other large commercial space!
My favorite is wires that run off into partially finished spaces and terminate somewhere you cannot determine.
My usual plan is to disconnect any wires or circuits that I am not sure where they go, or what they do. Then later, if I find out "such and such doesnt work!", hook them back up one by one until it does.
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