Wiring Diagrams for Electrical Receptacle Outlets - Do-it Wiring a 20-Amp 240-Volt Appliance Receptacle. This outlet is commonly used for a heavy load such as a large air conditioner. The outlet should be wired to a dedicated 20-amp/240-volt circuit breaker in the service panel using 12|2 awg cable. With this wiring, both the black and white wires are used to carry 120 volts each and the white wire is wrapped with electrical tape to label it hot. WIRING DIAGRAMS PDF filewiring diagrams fig. field-installed heater model field power wiring marked terminal plug and receptacle common equipment ground fan motor outdoor air thermistor printed circuit board schematic diagram component arrangement not suitable for use on systems exceeding 150v to ground Wiring Diagrams for Multiple Receptacle Outlets - Do-it Wiring Multiple Outlets in a Series. In this diagram wall outlets are wired in a row using the terminal screws to pass voltage from one receptacle to the next. Wiring outlets together using the device terminals, instead of a pigtail splice as shown in the next diagram, can create a weakest link problem. Central Air Conditioner Wiring Diagram | Free Wiring Diagram Central Air Conditioner Wiring Diagram - Collections Of Central Air Conditioner Wiring Diagram Gallery. Wiring Diagram for Bi Boiler Best Wiring Diagrams for Central. Central Air Wiring Graphic. Hvac Condenser Wiring Diagram Valid Wiring Diagram for Ac Condenser.