This diagram illustrates wiring for a 4 way circuit with the electrical source at the light fixture and the switches coming after. Two-wire cable is run from the light to SW1 and 3-wire cable runs between all the switches. The hot source is spliced through to the common terminal on SW2 and the hot terminal on the light fixture is connected to the common on SW1. The travelers run from SW1 to T1 on the 4 way and from T2 to the travelers on SW2. Note that the white wire is wrapped with black electrical tape when it is used for hot in these circuits.
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.
In this diagram the source for the circuit is at the light fixture and the two switches come after. Two-wire cable runs from the light, to SW1 and 3-wire cable runs between SW1 and SW2. The hot source is spliced to the white cable-wire, which is wrapped with black tape to mark it as hot and run through to SW1 where it is spliced to the black wire running to the common terminal on SW2. The hot terminal on the light fixture is connected to the common terminal on SW1. The red wire and marked white wire travelers connect the traveler terminals between the two switches.
This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
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