In this updated diagram 3-conductor cable runs between the receptacle and switch, and the red cable wire is used to carry the hot source to the bottom terminal on the switch. The neutral from the source is passed through to the switch box using the white wire and in this diagram the white wire is capped with a wire nut.
When the electrical source originates at a light fixture and it’s controlled from a remote location, a switch loop is used. The circuit pictured here is wired with 2-conductor cable running from the light to the switch location. The white cable wire in this switch loop is wrapped with black tape and connected to the bottom terminal on SW1 and the hot source at the light. The black wire is connected to the top terminal on SW1 and the hot terminal on the light fixture. The neutral from the source is connected directly to the neutral terminal on the light.
This page contains wiring diagrams for most household receptacle you will encounter including grounded and ungrounded duplex outlets, ground fault circuit interrupters (GFCI) as well as 20amp, 30amp and 50amp receptacles for 120 volt and 240 volt circuits.
This diagram illustrates another multiple light circuit controlled by 3 way switches. Here the source and the fixtures come before the switches. As with the other diagrams on this page, more lights can be added by duplicating the arrangement between the fixtures.
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