The second terminal on SW1 is connected to the red wire running to the hot terminal on the top half of the split receptacle.
The white wire is mark black on both ends to identify it as hot. At that box, the black wire is spliced with the white wire running to one terminal on SW2. The source hot wire is spliced with a pigtail to one terminal on SW1 and to the black wire running to the receptacle box. The source is at SW1 and 3-wire cable runs from there to the outlet, 2-wire cable runs from the outlet to SW2. Here again the connecting tab between the receptacle terminals is broken off and the neutral tab remains intact. With this arrangement, two lamps can be plugged into the same outlet and each can be controlled separately from two different locations. In this circuit a split receptacle is controlled by two separate switches.
#Indoor motion sensor light switch wiring diagram code
If you are running a new circuit, check the electrical code to understand this and any other updates to the required procedure. This represents a change in the NEC code that requires a neutral wire in most new switch boxes. The white neutral from the source is spliced in the receptacle box and run through to the box at SW1 where it is capped using a wire nut. In this updated diagram 3-wire cable runs between the receptacle and SW1 and the red cable wire is used to carry the hot source to one of the terminals. The black cable wire runs to the SW1 connecting it to the hot on the top half of the split outlet. The white wire is marked black on both ends to identify it as hot. The hot source is spliced to a pigtail that connect to the bottom, always-hot half on the receptacle and to the white cable wire running to SW1. The circuit neutral wire is connected to one of the neutral terminals on the outlet, it doesn't run to the switch. Here the source is at the outlet and 2-wire cable runs from there to SW1. The tab between the neutral, silver terminals should remain intact. The receptacle is split by breaking the connecting tab between the two, brass colored terminals. This diagram illustrates the wiring for a split receptacle with the top half controlled by SW1 and the bottom half always hot.
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