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Need clarification...12-3 means 3wires (usually black, red and white) plus a ground wire. A black white and ground wire is 12-2. Standard GFCI wiring is black to gold (screw) white to silver and ground wire to green. GFCI's have more than one way to be wired but normally come with directions. GFCI's can also be wired in conjunction with standard plugs. There are websites that will also show AC wiring diagrams which may be helpful.
the black screw is the "common" so the hot wire or the colored wire (usually black or red) bringing power in goes on to the black screw and all white wires (neutral) get connected together. you need to verify which wire has constant power when all wires are disconnected and separated first.
*White wires all connected together separate of the switch
green screw = ground or bare wire
black screw = hot wire/ wire with constant power
silver screws = (switched terminals) black or colored wire from each device being powered (eg. light) per screw
First you have to make sure you have the black or hot wire hooked up to the brass screws. That should power both pieces. On the outlet portion the white or common should be on the silver screw. Then the black wire going to the light should be on the other switch screw and the bare or green should be on the green screw
All new 2 wire cords with an attached plug should be polarized, meaning that one of the prongs is larger than the other, thus preventing you from plugging it into the receptacle improperly. If you look at the male prongs on the plug, the larger spade is the neutral and the smaller spade is the "hot" side. You have to find out which is the "hot conductor" on the cord. The cord is identified with a tracer (either ribbed or legibly mark on one side of one of the conductors . Follow the identifier up to where
you want the switch. Cut only the hot conductor leaving the neutral conductor untouched. (DO NOT CUT BOTH CONDUCTORS). You may have to trim the hot conductor back a little to fit into the molded channel of the switch. reassemble the switch. the unit is equipped with insulation displacement blades that will puncture the insulation thus making contact with the conductors.
If I understand correctly you want to replace a switch with a switch-plug combo? A switch-plug combo requires a neutral wire on the silver screw. The black hot wire from breaker goes to the dark-colored screw. The black wire going to switch goes to gold-colored screw.
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I answer questions for free. I know electric wiring. However I might not understand your problem. If I do not understand your problem, add a comment with more information and I will respond.
If I understand correctly you want to add a new switch and a new light in your garage. And you are starting from scratch with no knowledge. You are starting with a blank wall.
I do not know what a consummer unit is. Is that a type of light?
Here's a sketch of the project: We need an electrical receptacle or wall-plug so we can get electricity. We need to run a cable from the electrical wall-plug to the switch. This will bring electricity to your switch. And then we need to run a cable to the light.
Let's talk about how you get electricity from the wall-plug. The wall plug has a black and white wire connected to each side. Your cable has a black and white wire. You connect your black wire with the black side. Connect white to the white side.
Now run the cable to your switch. The cable arrives at the switch. The cable has a black and white wire. The switch is wired differently than the wall-plug. On the switch you connect one black wire. But the white is not connected to switch.
Now we're ready for the cable going to the light. The cable to the light has a black and white wire. Connect the black to the switch. So now you have 2 black wires connected to the switch. The black wires are on different screws. And then connect the two white wires together.
So the switch is wired. Run the cable to your light. The cable arrives at the light. The cable still has a black and a white wire. Your light will have wires -or- it will have screws.
If light has black and white wires, then connect black to black and white to white.
If your switch has screws, then connect black to brass-screw and white to silver-screw.
If the wires are coming out of the switch portion & not the outlet, 1 goes to power the other goes to that color wire that goes to your light. All you are doing with a switch is cutting one side of your power, putting switch in completes the circuit when it is turned on. Or breaks the circuit when it is turned off. The other wires, power in & back to light get wire nutted together.