4-way Switch Wiring - Electrical 101
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4-Way Switch Wiring

Typical 4-way Switch Wiring Diagram

Typical 4-Way Switch Wiring

In the diagram below, a 2-wire NM cable supplies power from the panel to the first switch box. The black (line) wire connects to the common terminal of the first 3-way switch.

A 3-wire NM connects the traveler terminals of the first 3-way switch and the first 4-way switch. A 3-wire NM connects the traveler terminals of the first 4-way switch and the second 4-way switch, and so on. A 3-wire NM connects the traveler terminals of the last 4-way switch and the second 3-way switch. Traveler wires are interchangeable on each switch.

The common terminal of the second 3-way switch connects to the light fixture(s).

The white neutral wires are connected together in each switch box.

Diagrams shown on this page are simplified for clarity. Electrical outlet boxes can have numerous NM cables going in and out. See Actual Switch Box Wiring Diagram.

Ground connection diagram is shown separately.

All traveler wires are interchangeable between pins of each switch

Typical 4-Way Switch Wiring Diagram

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