The wiring diagram for a 2 wire well pump provides detailed instructions on how to connect the pump motor to the power source, ensuring the correct voltage and polarity. One of the key elements in the 2 wire well pump wiring diagram is the pressure switch. The pressure switch serves as a control device, automatically turning the pump on and off.. All well pumps will have a ground wire, but when distinguishing between the two types of well pumps, the ground wire is not counted. Two-Wire Deep Well Pumps. With the way 2-wire well pumps are configured, the motor will be connected by two black wires and a green ground wire. The starting components will be located inside the motor itself.
Wiring Diagram for pumps with 2 wires plus ground Switch 10 20 30 40 50 60 70 80 Tank Control Box To Pressure To Control Box Pump Pressure Switch Ground Wire (Green) 4 in. Min. Well ID Breaker Box To Pump Wiring Diagram for pumps with 3 wires plus ground NOTE: Pump may show water stains as a result of factory water testing. WHAT IS THE VOLTAGE.. Typical 2-wire 240V Well Pump Wiring Connections. A 2-wire 240V well pump may have the following wires present and connected as given at the control box: Notice in our two-wire pump wiring installation schematic above that both L1 and L2 "hot" wires may be black in color or one may be black, the other red. L1 - Line 1 from power source - black wire