A transformer, (Fig.1), reduces normal 120 volt power down to 10 or 16 volts, thus adapting regular current to low voltage equipment such as chimes, buzzers and bells.
A transformer normally has two permanent wires, one white and one black, designed to provide power to the unit from the power source.
Two attachment screws are mounted on the opposite side, (Fig. 1), for attaching low voltage wires which are then connected to the bell, buzzer or chime.
Most transformers are designed so they can be mounted directly to an outlet or junction box, (Fig.2). The primary power source wires can then be run directly into the box.
If the transformer is not mounted directly to the outlet or junction box, the connecting 120 volt wires should always run through suitable insulated connectors and be spliced inside the box.
No. 18 bell wire can be used for connecting to the two terminal screws on the low voltage side of the transformer. There is no danger of shock when handling these light wires since the voltage they carry always ranges between 6 and 20 volts.
Bell wire can be held in place with insulated staples and is normally run along baseboards or inother exposed areas in a room.