In this circuit a split receptacle is controlled by two separate switches. With this arrangement two lamps can be plugged into the same receptacle and each can be controlled separately from two different locations.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
The wiring diagrams on this page make use of 4 way switches, between two 3 way switches, to control lights from three or more locations. A 4-way dimmer diagram is included as well as an arrangement to control the lights from four different points. Check here for 4 way switch troubleshooting and help with 3 ways switches here. For circuits that control lights from two locations only, check the wiring diagrams at this link.
At the beginning of the circuit the hot source is connected to the common terminal on SW1. The neutral is spliced to the white cable wire and then spliced to the neutral terminal at L1, along with the white 2-cable wire running to L2 where it connects to the neutral terminal.
The traveler terminals will always be connected from switch to switch. Travelers never connect to a device load or to a source wire. It doesn’t matter which traveler terminal is used for which traveler wire, reversing them should make no difference.
This diagram is the same as the one above but the dimmer comes first in the circuit. This arrangement is provided for easy reference when dealing with a circuit wired like this.
The diagrams on this page illustrate connecting multiple lights in 3 way and 4 way switch circuits. Check below for more details about these circuits and some troubleshooting tips.
The neutral wire provides a return path for the circuit and the ground wire provides extra protection from electrocution not found on older 30 amp, 240 volt appliance hookups.
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