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4-Way Switch and Intermediate Switch Diagram

This is a typical four-way switch and intermediate switch wiring diagram. The LOAD wire is in one 3-way switch box and the LINE from the power source is in the other 3-way switch box. The four-way switches are wired in between. A three conductor cable would be installed from switch to switch with the red and black wires being used as the hot travelers and the neutral conductor just spiced through to the next switch.

A Wiring Diagram depicting 3-Way Switches with the LINE and LOAD in Separate Electrical Boxes