Light Switch Wiring Diagram (Single Pole) - Easy Whether you have power coming in through the switch or from the lights, these switch wiring diagrams will show you the light. This light switch wiring diagram page will help you to master one of the most basic do it yourself projects around your house.. Wiring a single pole light switch.Electrical · Wiring a 3 Way Switch Light Switch Wiring Diagram | Wiring | Electrical | Repair When the switch is off, the black wire that goes to the light has no power in it. With the switch on, it is hot. Single Pole Switch Wiring Diagram - Power at the Light. This, Single Pole Switch Wiring Diagram can be helpful if you are trying to understand how your light and switch are wired. With a single pole switch, there are two variations.