After I saw this sentence I realized how easily somebody could endanger human life doing this carelessly and how wordy it would be to give complete directions. Painful or lethal electric shock because the connections are inadequately or improperly insulated from human or animal contact.
Some ceramic breadboards are also conductive, and some plastic breadboards are flammable.
Assembly Instructions Be certain that you are working in an appropriate work space with adequate light, heat, ventilation, and an electrical power source suitable for developing power-line devices, including GFCI, proper polarity and grounding. Connect the 117vac hot wire to a 1amp 250vac slow blow fuse. Connect one 24vac lead to the other side of the fuse. Connect the hot of the receptacle to the remaining 24vac lead and the remaining 117vac transformer lead. Make certain all the connections are mechanically solid, electrically conductive, and insulated from human contact.