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.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
In order for a 4 way circuit to work, the 3 way switches must be wired properly at the the beginning and end of the path. So be sure that the common terminal on one of the 3 ways is wired to the hot source, and the common on the second 3 way is wired to the the hot terminal on the lights.
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