Once again, the white neutral wires are simply joined together, and the grounding wires are joined together with pigtails connecting the switch and to the box, if it is metal. However, at this second switch, the common screw terminal is connected to a black hot wire that leads onward to the light fixture. At the second switch box location, the wiring is similar to the first switch, with the traveler terminals connected to the traveler wires coming from the first switch.Because switches do not have white-colored neutral wire connections, the neutral wires at the switch boxes are simply joined together so they pass through, onward to the light fixture box.This provides two alternate pathways for hot current to flow between the switches-this is what allows the switches to turn the lights on and off in a flexible manner. The black and red wires are "travelers" and are connected to the traveler screw terminals on the two switches. The cable run linking the two switches is made with three-wire cable.If the switch box is metal, it also must be pigtailed to the grounding wires. The grounding wire is connected both to the switch using a pigtail wire, and to the second cable run passing onward to the next switch. At this first switch, the black feed wire is connected to the common screw on the switch. This means that there is a black hot wire, a white neutral wire, and a bare copper grounding wire. At the first switch location, the feeder wire from the power source is a 2-wire cable with ground.The Spruce Home Improvement Review Board.
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