110v wiring produces power to operate electrical outlets. When it is used, more current is involved but less voltage or pressure from an electrical circuit. This is why with a 110v level, the wire conductor is thick to be able to process the heat versus a 220v thin wiring. For instance, some 110v devices with an amperage limit of 20 amps must have 12 gauge. On the flip side, voltage isn’t a consideration for choosing the size, but it defines the wire’s insulation.
Furthermore, 110-volt wiring has hot, neutral, and ground wires. Accordingly, a 110v outlet has three-pronged plugs with the middle, which is ground. The other two placed side by side come in different sizes, so there’s only one way to insert the plug.