“Are 2 wires at the door enough to give both voltage to Doorbell and have the Chime start ringing when the button is pushed? Or do I need 3 wires at the door to accomplish both tasks?”

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• Two wires of existing system worked perfectly for me old chime still works in addition to the electronic one provided by Nest

  Answered by Reg606 5 years ago

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• My doorbell had 2 wires and it works well

  Answered by Muri 5 years ago

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