Residential door bell wiring uses low voltage except the line side of the transformer. Wiring diagram for a two chime doorbell.

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Typical doorbell wiring diagram. Wiring for two doors is the same as for one with the transformer hardwired to the 120 volt source from a house circuit. Located on the central hub of a doorbell chime the doorbell terminals are where the wires from the doorbell push buttons and transformer connect to the chime. In the above door bell wiring diagram i shown diagram with transformer and if you have a doorbell which have internal step down supply then you can also follow and use the above first diagram method. Connect the input wires on the transformer to the source circuit using the black to black white to white and ground to green method. Typically doorbell chimes have three terminals labeled rear trans and front that correspond with each connection. The power for the system comes from a voltage transformerit is usually installed on a light box in the attic basement near the electrical panel or somewhere else accessible or at least it should be accessible.
Doorbell wiring and installation. The rear terminal is where the rear doorbell push button if you have one connects to the chime. I hope now you learn doorbell wiring however if you have any question regarding this post then do a comment in below section. A typical residential doorbell system includes a transformer to convert 120vac to 24vac a bellbuzzer and button for ringing the bell. Basic doorbell system wiring shown.