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Trying to install a nest doorbell but need to change the transformer. I believe I found it here but it is attached to a switch next to the furnace. When I unhooked the wires the doorbell stopped working so I believe this is it. Would like a second opinion?enter image description hereenter image description hereenter image description hereenter image description hereenter image description here

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  • I'd be happy to give you a third opinion: electrical codes in some places indicate you shouldn't have anything else powered by your furnace circuit.
    – A. I. Breveleri
    Mar 28, 2020 at 18:24

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That is definitely what you're looking for. To be safe,trace the wires as far as you can to make sure they're not connected to anything else too. That's a strange location for one, mounted on a box to a furnace. Determine if the switch controls the transformer, that would be strange too. Make sure it's not feeding your thermostat.

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    Yeah seems odd. I added some more pics to show what I’m working with.
    – Matt Blair
    Mar 28, 2020 at 18:40

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