Whats the extra wire in my doorbell chime?


Old 11-23-18, 05:33 PM
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Whats the extra wire in my doorbell chime?

My house is 12 years old; I bought it 6 years ago.
There is one doorbell at the front door.
I took the cover off my door chime during a Nest doorbell install.
There are two cables going into it, each with two wires.

Both white wires are attached to center contact labeled transformer.
One red wire is connected to the left contact labeled front.
The other red wire isn't even stripped.

I disconnected the white wire that is with the unstripped red wire.
The door bell still lights up and rings properly.

1) Can I confidently proceed, ignoring the second cable (and leaving the second white wire unattached to anything)? Or do I have to do something with the 2nd white wire? (if so, what?)

2) I am guessing the second cable goes to the side door, but they decided not to use it. Is that likely right, or is there another likely explanation. Everything is drywalled, so there is nothing to look at.

Thanks much
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Old 11-23-18, 05:45 PM
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That's correct. It's for a second or back door.
Old 11-23-18, 08:46 PM
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Interesting wiring. Just FYI..... those wires don't go directly to the buttons.
There is a splice at the transformer. Shouldn't affect your installation.

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