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Tag: Intermediate Switch Wiring Diagram

Four-way switch wiring diagram depicting the LINE and the LOAD in two separate switch boxes. A two conductor cable with a grounding conductor supply's power from the source to the first three-way switch. From the first switch a three conductor cable goes to the first four-way switch and then to the next four-way switch and ends at the last three-way switch. The white neutral conductor is spliced through each switch box until it is connected to the white LOAD wire in the two conductor cable that goes to the lighting LOAD or ceiling fan. The black LOAD wire terminates on the 3-way switch common screw terminal. Travelers are connected on the 4-ways according to the manufacturers' instructions.

Four-Way Switch Diagrams

Dear Mr. Electrician: I need four-way switch diagrams to figure out how to wire four-way switches. Answer: You can see my four-way switch diagrams above and down below.  You can add as many four-way switches as you want if you have the LINE and LOAD correctly connected on the 3-way switches at each end. NOTE: Text links below go to applicable products on Amazon.  As an Amazon Associate, I earn from qualifying purchases.  Using my links helps to keep this website FREE. My four-way switch wiring diagrams are available as stickers from RedBubble.  As a RedBubble affiliate, I earn a commission from each purchase. Table of Contents: Four-Way Diagrams Four-Way Instructions FOUR-WAY SWITCH DIAGRAMS The schematic diagram below shows how all four-way switches are wired.  The wiring diagram further down depicts another choice of wiring method. In some countries, the four-way is called an intermediate switch.  You would continue from one 3-way switch box with the 14/3 three conductor cable (Two colored traveler wires, a white neutral, and a bare or green ground wire) in and out of each four-way switch box.  The white wires get spliced through in each switch box. The red and black wires are connected to the four-way switches.  You connect the other 3-way switch at the other end with the LINE or the LOAD.  See the four-way light switch wiring diagrams above and below. Follow the switch manufacturer’s instructions and wiring diagram, as the connections on the switch vary by manufacturer.  Sometimes the switch wiring connection diagram is printed inside the four-way switch packaging box (See package example below). Bare or green ground wires are spliced together with a grounding pigtail and then connected to the metal switch box with a 10/32 machine screw and the green screw on the switch. Top Of Page Due to the proliferation of WiFi smart switches and electronic dimmers, the National Electrical Code now requires that a neutral conductor be installed in at least one of the switch boxes.  See Article 404.2(C).  This is accomplished by bringing the power feed into the switch box instead of the ceiling light. Using the equipment grounding conductor as the neutral connection for a smart switch is not acceptable and can be dangerous. At one time, some electronic switches and dimmers were approved to connect the neutral terminal on the switch to the grounding conductor.  That is no longer allowed.  Some smart switches for sale may not require a neutral conductor to operate, but their functions may be limited. You must use electrical boxes approved for the number of wires and devices you install for your light switches. To determine what size boxes you should use, see article 314 in the National Electrical Code (NFPA 70). Remember that each light switch will count as two wires when calculating your box fill.  In addition, any clamps inside the box will count as one wire.  Cable and conduit connectors outside the electrical box with only the locknut and bushing inside do not count as a wire. An update in the 2020 National Electrical Code requires that all ceiling light electrical boxes...