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Black represents Hot and White common. For the light to operate it needs a white and black wires. The switch box has two cables with a white and black wire plus a ground. One wire is from the supply and the other to the light. Connecting the whites just provides common directly to the light. The blacks go into and out of switch because it is the hot side that is being switched.

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Q: Why would a light switch have two black wires for power and two whites caped off?
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How do you wire a light and switch with the 2 wire old romex?

with a standard 1 pole light switch (one switch operating the light) it is black wire to black wire and white to white (non grounded)


Have 3 lights Power to light 1 Need to connect light 2 then light 3 then down to single pole switch How do you wire?

You would wire the switch to the first light. Code says to break the black or power side of the circuit. Connect the white to the light. Take the black down to the switch on the black wire and back to the light on the white. This is a line of wire from the light to the switch. From the first light, take the white and the return white from the switch to the second with another run of wire. This will be regular black white with ground. White to white and at the first light the return line from the switch is white but hook to the black to the second light. Second light to third just continues the two wires. Black to black, white to white. I think this is clear enough to follow. If not, ask again.


How do you connect multiple lights to one switch starting at the light?

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.


Light switch has 4 wire colors red and white and green and black which is the hot wire?

You have a 3 way switch. Your black wire is the hot wire. Your green wire is the ground wire. Your red and white wires go to the light and other switch. You should have gotten a wiring diagram with your switch.


How do you remove 240 volt light sensor and return to switch operation?

Remove the light sensor and place a switch between the red and black wires. The black wire is one leg of the "hot" pair and the load is connected to the red wire. This will now switch the black hot through the red wire that goes to the load.

Related questions

How do you wire a light and switch with the 2 wire old romex?

with a standard 1 pole light switch (one switch operating the light) it is black wire to black wire and white to white (non grounded)


What does the brake light switch look like?

black plastic switch you pull


I have four outside light fixtures on the same circuit The first box has a black a white and a bare wire coming into and out of it The light itself has a black a white and abare How do you wire this?

If you are down stream from the switch then all blacks together, all whites together and all grounds (bare wires) together.


Have 3 lights Power to light 1 Need to connect light 2 then light 3 then down to single pole switch How do you wire?

You would wire the switch to the first light. Code says to break the black or power side of the circuit. Connect the white to the light. Take the black down to the switch on the black wire and back to the light on the white. This is a line of wire from the light to the switch. From the first light, take the white and the return white from the switch to the second with another run of wire. This will be regular black white with ground. White to white and at the first light the return line from the switch is white but hook to the black to the second light. Second light to third just continues the two wires. Black to black, white to white. I think this is clear enough to follow. If not, ask again.


How do you connect multiple lights to one switch starting at the light?

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.


How do you make a black light bulb?

switch lights off


Can you change an electrical outlet into a switch for a light?

Sure. For a light you need a fixture to hold the light and the light itself. The light needs to be connected to a voltage supply which you can get from the outlet. In the outlet box you will have a black, white and bare ground wire. Essentially you connect the white and bare wires directly to the light and switch the black wire (hot) through a switch.


The name of the light-skinned black man that was arrested for sitting in a car that was specifically for whites?

homer plessly


Where is the light switch in cod black ops zombies?

In the room near the theater


Light switch has 4 wire colors red and white and green and black which is the hot wire?

You have a 3 way switch. Your black wire is the hot wire. Your green wire is the ground wire. Your red and white wires go to the light and other switch. You should have gotten a wiring diagram with your switch.


How do you remove 240 volt light sensor and return to switch operation?

Remove the light sensor and place a switch between the red and black wires. The black wire is one leg of the "hot" pair and the load is connected to the red wire. This will now switch the black hot through the red wire that goes to the load.


Why can l only get power the the kitchen light switch when turning on the bathroom light switch?

It sounds like the feed for the kitchen is fed through the bathroom switch box. The black feeding the kitchen light is connected to the wrong side of the switch. There should be two black on one side of the switch and one on the other. One of the two blacks need to be moved to the other side of the switch. **BE VERY CAREFUL or CALL A LICENSED ELECTRICIAN** Even with the switch OFF the live side of the switch will be LIVE!!