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.
The wiring diagrams on this page make use of 4 way switches, between two 3 way switches, to control lights from three or more locations. A 4-way dimmer diagram is included as well as an arrangement to control the lights from four different points. Check here for 4 way switch troubleshooting and help with 3 ways switches here. For circuits that control lights from two locations only, check the wiring diagrams at this link.
Here the source is at the receptacle and 2-conductor cable runs from there to SW1. 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 which continues on to the bottom terminal on SW1. The black cable wire is connected to the top terminal on the split receptacle and runs to the top terminal on SW1. The circuit neutral wire is connected to one of the neutral terminals on the receptacle, it doesn’t run to the switch.
Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be connected to the switches in these circuits, although some smart switches may make use of a neutral wire to operate the device.
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