Connect the other wire from the button to the other contact on the chime in the housing. Connect one of these to the chime in the doorbell housing and the other to one of the wires from the door button. There will be two wires from the transformer output. Connect the source neutral to the white wire on the transformer and the source ground to the green wire on the transformer. Connect the black wire from the source circuit to the black input wire on the transformer. If you do not know what you are doing, then please call a professional. Furthermore, the wire colors on the transformer will be different than the thermostat wires.

Additionally, the common (sometimes black) should come from the common side of the transformer.

It is hardwired to a 120 volt circuit cable run to the outlet box. The red wire should always come from the hot side of the 24-volt transformer. The transformer will usually be tucked into the outlet box where the doorbell housing is mounted. Both in-wall fixed building wiring, or portable cordage. When pressed, the button will send the transformer output through the chimes, sounding the bell until it is released. () Note that is NOT the color code you will see in power wiring in North America. Ground Green, Green with Yellow Stripe, or Bare Wire. The color codes are: 3 Phase, Phase 1 Brown. These are commonly seen in industrial motors and equipment’s. A small, 16 awg wire runs from the door button to the chimes. 277/480 Volt AC Wiring Color Codes in USA. Doorbell Transformer Wiring DiagramĪ hardwired doorbell includes a small transformer that converts the household alternating current (AC), to direct current (DC) for the doorbell chimes. Included are wiring for a typical hardwired doorbell with a transformer, a two-button doorbell, an old house doorbell powered by a battery, and an alternate to battery power using an ac adapter. If you're putting in a new hardwired doorbell or you need to repair an existing one, the diagrams on this page illustrate the most common installations you will find.

Power transformer wire color code