This is an updated version of the first arrangement. Because the electrical code as of the 2011 NEC update requires a neutral wire in most new switch boxes, a 3-wire cable runs between the light and switch. The red and black are used for hot and the white neutral wire at the switch box allows for powering a remote controlled switch.
This page contains wiring diagrams for household light switches and includes a switch loop, single-pole switches, light dimmer, and a few choices for wiring a combo switch/outlet device. Also included are wiring arrangements for multiple light fixtures controlled by one switch, and a split receptacle controlled by two switches.
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.
Here a receptacle outlet is controlled with a single-pole switch. This is commonly used to turn a table lamp on and off when entering a room. In this diagram, 2-conductor cable runs between SW1 and the outlet. The source is at SW1 and the hot wire is connected to the bottom terminal there. The top terminal is connected to the black cable wire running to the hot terminal on the receptacle and the source neutral is spliced with the white cable wire which runs on to the neutral on the receptacle.
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