See the four-way light switch wiring diagrams above and below.įollow the switch manufacturer’s instructions and wiring diagram, as the connections on the switch vary by manufacturer. You connect the other 3-way switch at the other end with the LINE or the LOAD. The red and black wires are connected to the four-way switches. The white wires get spliced through in each switch box. 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. In some countries, the four-way is called an intermediate switch. A four-way switch is added when more than two switch locations are needed to operate the same light. ![]() The wiring diagram further down depicts another choice of wiring method. The schematic diagram below shows how all four-way switches are wired. As a RedBubble affiliate, I will earn a commission from each item purchased. My four-way switch wiring diagrams are available as stickers from RedBubble. As an Amazon Associate, I earn from qualifying purchases. NOTE: Text links below go to applicable products on Amazon. 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. ![]() Electrician: I need four-way switch diagrams to figure out how to wire four-way switches.Īnswer: You can see my four-way switch diagrams above and down below. The load or bulb is connected between the common poles of the two SPDT switches.Dear Mr. One throw of the two SPDT switches is connected to the phase line and the other throws in the neutral line. In Carter wiring, both phase and neutral lines are connected to the switch. Carter wiring system: A prohibited Multiway switchingĬarter wiring is a 3-way wiring or a multi-way wiring method used at the time of old K&T (knob-and-tube) installations, which has been prohibited by the NEC (National Electrical Code) since the early ’90s. the output will be high when both switches are in opposite states. Coast 3-way or California 3-way circuit shows a Truth table output of an XOR gate, i.e. While in the same switch position, the lamp will be OFF. Thus the lamp L1 will ON if one switch is ON and the other is OFF. Then the phase connection to the load connects from the second pole. The common pole and second pole of the first switch are connected to the corresponding poles of the second switch. In Coast 3-way or California 3-way wiring, the first pole of both switches has the phase line. Similarly, if the connections between the switch s1 and s2 have interchanged, the load will ON when the switches have opposite positionsĬoast 3-way or California 3-way wiring systemĬoast 3-way or California 3-way wiring and Carter wiring system are another method of connection that can be used for staircase wiring or multiway switching. That is the light ON’s when both the switches are in the same position. ![]() If a truth table is made for the above traveler system output, it will have a result similar to an XNOR gate. Thus in staircase wiring, we can control the load from both positions. Changing the ON & OFF condition of a single switch can determine whether the circuit is closed or open. It makes an arrangement that, to close the circuit both the switches should be in the same position in order to make the two common poles in contact to achieve a closed circuit. And the phase line to the load is taken from the common pole of the next switch. The phase of the supply line is connected to the common pole of a switch. ![]() That is similar poles of both two switches are connected to each other. The first pole and second pole of the SPDT switch S1 is connected to the corresponding first and the second pole of the SPDT switch S2.
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