Here the source is at SW1 and the light fixture comes immediately after. The source neutral is spliced through to the light fixture. At the light the travelers are splice together and run to the 4-way switch. At the 4-way, the hot wire from the common terminal on SW2 is splice through to the hot on the light fixture.
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.
With this configuration any wire in the circuit may be hot at all times and there’s no protection against electrocution. When replacing an ungrounded device in an older circuit like this, use the polarized one above and not the grounded receptacle at the top unless it is grounded to a metal outlet box that is itself grounded to the house electrical system through a continuos metal conduit.
In a kitchen where only one outlet box is available and both a switch for a garbage disposal and a gfci receptacle are needed, a a switch/gfci combo can be used as in the diagram at this link.
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