Here two switches are wired in the same box to control two separate lights. The source is at the switch box and a 2-conductor cable is run to each light. One source is spliced to each switch with a pigtail to power the two lights.
To wire more than one GFCI receptacle in the same circuit, connect the source to the line terminals on each device using a pigtail splice. The load terminals are not used for this circuit. See more GFCI wiring diagrams at this link.
Three-way switches have 3 terminals to carry circuit electricity and one terminal for a ground wire. Of the three circuit terminals, one is called the common and the other two are known as travelers. The common terminal may be labeled and is usually a different color than the traveler terminals. Depending on the manufacturer, the travelers may be on opposite sides of the device or the two terminals may be on the same side. In any case, the common terminal will be distinguished from the travelers in some way.
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.
Here a receptacle is added to the circuit before the first switch. It is not controlled with the switches but is instead always hot. The source hot, neutral and ground are spliced to a 2-wire cable that runs to the new outlet. The 3 way switches and light are then wired in the usual way with the common on SW2 spliced to the source hot and the light hot wired to the common on SW1.
At the beginning of the circuit the hot source is connected to the common terminal on SW1. The neutral is spliced to the white cable wire and then spliced to the neutral terminal at L1, along with the white 2-cable wire running to L2 where it connects to the neutral terminal.
This diagram illustrates wiring for one switch to control multiple lights. The source is at SW1 and 2-conductor cable runs from there to the fixtures. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light. This is the simplest arrangement for more than one light on a single switch.
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