This represents a change in the NEC code that requires a neutral wire in most new switch boxes. If you are running a new circuit check the electrical code to understand this and any other updates to the required procedure.
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.
In this diagram the source is at SW1 and the hot is connected to the common terminal there. Three-wire cable runs between the switches and 2-wire cable runs from the dimmer to the light fixture. The travelers from SW1 run to T1 on the 4 way switch and from T2 to the traveler wires on the dimmer. The dimmer common wire is spliced to the hot terminal on the light.
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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