The green screw at one end is for the ground wire. Two wire cable runs from the combo to the light fixture and the switch output is connected to the black wire running to the fixture hot terminal.
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How to wire switches. There is only the single 3 wire plus ground in the downstairs switch box and only two 2 wire plus ground cables at the fixture. On each of the two single pole switches install a hot wire pigtail and a ground wire pigtail that will be used to attach the switches to the wires from the feed cable. To connect the switches simply score the wire with your wire stripper and push the insulation to expose about 34 in. The source neutral wire is spliced to the neutral on the receptacle half of the combo device and to the white cable wire running to the light. Logically it cant be done as both switches would need to be on for the circuit to work power the bulb that is but a two way switch system means that either switch should be able to turn on the bulb. Put a piece of tape on the wire that goes to the common terminal screw.
This gauge is when you want to use the quick connect method when wiring a light switch. When nothing is hooked up there is power in the 2 wire plus ground cable on the upstairs switch. Connect the wires to the new 3 way switches with ground screws using one of the two wiring diagrams fig. Feed a length of 14 3 type nm cable or 12 3 if youre connecting to 12 gauge wire between the two boxes. Connect one end of the 6 inch wire to the top terminal of the first switch. Twist the other end together with the black wire from the incoming circuit cable and the black wire from the cable going.
At the light it connects to the neutral terminal. Connect the source wire to the bottom terminal of the switch and the other black wire to the top terminal. Tape the wire nut to the wires with electrical tape. Use two 2 way switches to create a two way switch system. The other two wires can attach to either of the identical terminals. Connect one of the green pigtails from the orange wire nut to each of the bare copper ground wires that are connected to the three fixtures.
The 14 3 cable has three insulated conductors. When replacing an existing three way light switch be sure to return the wires to the proper screw terminals. Twist the wires together with a yellow wire nut. In this picture you can see the strip gauge on the back of the switch. Connect the last switch in the usual manner looping the wire around the screw in a clockwise direction. White black and red plus a bare ground wire.
When i say 2 way swithces i mean a switch with two copper screws. Strip about 34 inch of insulation from one end of each black wire. The two switches appear to be connected by a 3 wire plus ground cable. Simply strip the wire to the length specified and push the wire into the hole. Push the wires into the back of the gang box. Cut two lengths of black wire and two lengths of bare copper wire about 6 inches long.
Gallery of How To Wire Switches
