Included is a diagram for a 3 way dimmer and an arrangement to control a receptacle from two locations. For more information about these circuits and troubleshooting tips check below.
Three-way switches have 3 terminals to carry circuit electricity and one terminal for a ground wire. Of the three circuit terminals, one is called the common and the other two are known as travelers. The common terminal may be labeled and is usually a different color than the traveler terminals. Depending on the manufacturer, the travelers may be on opposite sides of the device or the two terminals may be on the same side. In any case, the common terminal will be distinguished from the travelers in some way.
A 4 way switch must be wired between two 3 ways as shown in the diagrams on this page. A 4 way has five connections: one ground, and 4 circuit terminals divided into two matching pairs. Each pair of terminals should be wired to the traveler wires from one of the 3 way switches. The travelers can be wired to either terminal in a pair, but don’t mix up the pairs or the circuit won’t work properly.
When replacing an ungrounded, polarized receptacle use this type and not the grounded type above, unless it is grounded by a jumper wire to a metal outlet box that is tied to the house service panel ground through a continuos metal conduit.
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