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.
At the receptacle the black cable wire from SW1 is connected to one of the hot terminals and the red wire is spliced to the white wire on the 2-conductor cable running to SW2. The white wire is wrapped with electrical tape to mark it as hot. The black wire is connected to the second hot terminal on the receptacle and to the top terminal on SW2 at the other end.
A 4 way switch must be wired between two 3 ways as shown in the diagrams on this page. A 4 way has five connections: one ground, and 4 circuit terminals divided into two matching pairs. Each pair of terminals should be wired to the traveler wires from one of the 3 way switches. The travelers can be wired to either terminal in a pair, but don’t mix up the pairs or the circuit won’t work properly.
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