A combo switch/receptacle is handy when you need both, but you only have one outlet box available. Like the split receptacles above these devices makes use of a removable connector between the two, hot terminals to divide the device when needed. When intact and wired to one hot source wire, the combo device can be used to turn a light off and on, while the receptacle will be constantly hot.
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.
At SW1 the white wire is wrapped with black tape and run through to the common on SW2 using the white wire at each switch. At the lights the white wire from SW2 is spliced to the hot terminal on each fixture. The black and red wires running between the switches serve as the travelers for the circuit. At the 4 way the travelers from SW1 connect to T1 and T2 connect to the travelers for SW2.
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.
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