In this circuit, two fixtures are shown but more can be added by duplicating the wiring arrangement between the lights for each one added. Here the source is at SW1 and 3-wire cable runs from there to L1. Two, 2-wire cables run between the fixtures, and 3-wire cable runs from the last one to SW2.
This represents a change in the NEC code that requires a neutral wire in most new switch boxes. If you are running a new circuit check the electrical code to understand this and any other updates to the required procedure.
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.
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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