Electrical transformers connect two different electrical circuits that operate at two different voltage levels. For wiring a transformer, gather black and white gauge wires, wire cutters, wire strippers, an alternating current motor and a power supply.
Identify the schematic and rating of the transformer that needs wiring. Ensure that there is no supply of electrical power to the transformer circuit. Uncover the terminal connection box to expose the screw terminals. Strip off 1/2 an inch of insulation at each end of the black and white wires using the wire strippers.
Transformers have two sides: the primary side and the secondary side. The power enters the transformer through the primary end, while the output is drawn from the secondary side. Connect one of the primary transformer terminals to the negative terminal of the power supply using a stripped black wire. Connect the other primary terminal to the second power supply terminal using the white stripped wire.
Locate the two terminals that provide the desired voltage output on the secondary side. Connect one white and one black wire to the located secondary terminals, and connect the other ends of the wires to the terminals of the alternating current motor. Replace the covers and other encapsulations on the transformer.
Switch on the power supply to the transformer circuit, and set the appropriate output voltage for the motor to start running. The wiring is now complete.