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 this diagram the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between SW1 and SW2 are connected to the traveler terminals. The hot source is connected to the common terminal on SW1, and the common terminal on SW2 connects to the hot terminal on the light.
At the lights the hot source is spliced to the black wire at each fixture box, at the last fixture it is spliced to the black wire running to the common on SW1. The neutral from the source is connected to each light fixture with a pigtail and run on to the next light.
This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
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