![]() ![]() With most electrical installations, it is important to remember that attaching the ground wire is critical if you want the circuit, and user, to be protected from shorts or faults in the system. Master Tool Repair was kind enough to make the following video available for folks that are rewiring their own pressure switches. To search for a wiring diagram, refer to the data plate on your. One wire connects to the terminal on the compressor ON/OFF switch and the other to a terminal on the motor. you can use a voltmeter to read the voltages that are present on the incoming insulated wires in the pressure switch enclosure. Of course, if you have a pressure switch like the one below, the wiring is fairly simple. 1 switch point, high contact rating of up to 5 A / AC 220 V. On the right side of the left hand image above, you can see the screw to which the ground wire is attached. The wire terminals themselves are usually marked with LINE – which is the terminals for the power supply from the wall plug, and the other side is noted as LOAD or MOTOR, and the motor wires are attached to these terminals. It's important to remember that because this is a 220-volt circuit, the white wire is hot, not neutral as it would be in a 120-volt circuit. This type of cable includes a black wire, a white wire, and a bare wire. One of these is to bring the power cord from the wall plug through the wire-way and up to the terminals on the pressure switch, and the other is to allow the wires from the switch back out of the switch and up to the motor circuit. When wiring a 220 switch, it's common to use two-conductor cable if the appliance has no auxiliary 120-volt functions. Note that there are two wire-ways under the floor of the pressure switch. The image on the right has the cover on, and on the left, the cover off. In the photo above you see two views of the same pressure switch.
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