The very first thing you do is shut off the breaker to this circuit. Now if you mean in a receptacle or switch box, the incoming cable ground wire, first connects to the box ground screw and then it is twisted with the outgoing ground wire and a wire nut is screwed on the ends of the wire to hold the wires together. In the case of a receptacle the same procedure is applied except there is a short piece of ground wire also twisted to the incoming and outgoing wires. This is called a pigtail and it goes to the green ground screw on the duplex receptacle
Normally red or black is the hot wire and green is the ground. However someone may have used the green wire as the neutral wire which is normally white. Just connect the black wire from the light to the red wire and the white wire from the light to the green wire and see if it works. If not you have to pull the wires out of the ceiling box and see how they wired it.
The green wire from the light fixture should be attached to the ground wire in the electrical box to provide grounding for safety purposes. This helps prevent electrical shocks and protects against electrical malfunctions.
You put switch in series with the black supply wire and the black wire to the first light. Then connect black wire of first light to black wire of second light, black wire of second light to third light and so forth. Do the same with the white wires and ground wires.
If the question is, can I wire a switch to an existing light fixture (and I must assume that it's something like a pull-chain light fixture), the answer is yes.If the question is, "how do I wire a switch to an existing light fixture that has no external switch", the answer is, "in series".The attached web site gives simple instructions on how to wire a basic light switch to an existing light.See sources and related links below
Don't worry about it some fixtures have no ground terminals. just shove the groung wire to the back of the box. Correction, if the fixture is metal and it shorts out, the metal surrounding the fixture could become electrified. That's why fixtures today are normally grounded to their mounting plates and then the lead is attached to the incoming romex. In the past, attaching these plates to metal boxes (either grounded by an incoming wire or grounded to the BX cable) eliminated the need for a ground wire. If the hot wire hit or shorted to the fixture, it would blow a fuse or circuit breaker. Many electrocutions and fires later, the folks at Underwriters realized that even that method of grounding wasn't sufficent (the old aluminum boxes and bx cables were crappy conductors. Solution; (and I practice what I preach because I remodel many old homes) get a little creative and spend the extra time to wrap a little ground wire to a mounting screw, or piece of metal, on the mounting plate of the fixture and then attach it to your incoming romex ground. On an old fixture, it could mean the difference between a fire and a tripped circuit breaker. If you have any metal boxes, old or new, ground to those too. <><><> Connect a pigtail to the metal canopy, and use a wire nut to connect the safety ground to it.
To properly wire a light fixture in a room, first turn off the power to the circuit. Then, connect the black wire from the fixture to the black wire in the electrical box, and the white wire from the fixture to the white wire in the box. Finally, connect the ground wire from the fixture to the ground wire in the box. Secure the connections with wire nuts, and then mount the fixture according to the manufacturer's instructions.
Connect the ground wire to the metal box.
To connect a wire switch to a light fixture, first turn off the power to the circuit. Then, connect the black wire from the switch to the black wire from the light fixture using a wire connector. Next, connect the white wires together and the ground wires together. Finally, secure all connections with electrical tape and mount the switch and light fixture as needed.
To wire fluorescent lights properly, follow these steps: Turn off the power to the circuit. Remove the cover of the light fixture. Connect the black wire from the power source to the black wire of the light fixture. Connect the white wire from the power source to the white wire of the light fixture. Connect the ground wire from the power source to the ground wire of the light fixture. Replace the cover of the light fixture. Turn on the power and test the lights. Make sure to follow all safety precautions and consult a professional if needed.
To ground a light fixture properly, connect the green or bare copper wire from the fixture to the grounding wire in the electrical box using a wire connector. This helps prevent electrical shock and ensures safety.
To wire a fluorescent light properly, first turn off the power to the circuit. Then, connect the black wire from the light fixture to the black wire from the power source, and the white wire from the fixture to the white wire from the power source. Finally, connect the ground wire from the fixture to the ground wire from the power source. Make sure all connections are secure and insulated before turning the power back on.
To properly install a 3-wire light fixture in your home, follow these steps: Turn off the power to the circuit at the breaker box. Remove the old light fixture and disconnect the wires. Connect the black wire from the fixture to the black (hot) wire in the ceiling box. Connect the white wire from the fixture to the white (neutral) wire in the ceiling box. Connect the green or bare copper wire from the fixture to the ground wire in the ceiling box. Secure the wires with wire nuts and mount the fixture to the ceiling. Turn the power back on and test the light to ensure it is working properly.
To properly ground a light fixture, you need to connect the fixture's grounding wire to the grounding wire in your electrical system. This helps prevent electrical shocks and ensures safety. Make sure to follow the manufacturer's instructions and consult a professional if needed.
I always connect the ground wire to the box. However, if there is no real ground wire running back to the panel it really does you no good. The NEC requires that you rewire the circuit with the proper conductors. Remember that the ground is for your protection. Without a proper ground, you run the risk of injury or death if the fixture wiring fails.
To properly wire a light fixture with 3 sets of wires, first identify the hot (black), neutral (white), and ground (green or bare) wires in each set. Connect the hot wires together, the neutral wires together, and the ground wires together using wire nuts. Then, connect the fixture's hot wire to the group of hot wires, the neutral wire to the group of neutral wires, and the ground wire to the group of ground wires. Finally, secure all connections with electrical tape and install the light fixture according to the manufacturer's instructions.
If you mean 2 bare copper wires those are the ground wires. Tie them together and then connect the light fixture ground wire which will be green or bare copper to those ground wires.
If you are referring to a porcelain or plastic ceiling light fixture most do not have a place to connect the ground wire. You cannot ground these type fixtures. Just connect the ground wire to the mounting crossbar and forget about connecting it to the light itself. It is on the ceiling and will never be touched unless you change the bulb and then you will have the switch in the off position. It is perfectly safe.