It is because the nec standard.
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∙ 12y agoIf this is a home wiring question and the wires are black and white then black is Hot and white is Neutral. If you also have a red wire, it is the other hot wire, and either the black or the red wire to the white one would be 120 volts, and red to black would be 240 volts.
Assuming the wires are the correct gauge for application and breaker you use black and white wires as hot. Put red electrical tape on each end of white wire and connect red and black to the breaker output and bare wire to ground lug in panel. At receptacle connect black and red to hot contacts and bare wire to ground lug.
Load (or hot wire, usually black or red), Neutral, (white), and ground,(green) wire.
On a 3 wire dryer cord there is no green wire. The white wire coming from the outlet is connected to ground or the green screw. The black and red wires are the hot wires.
You will have to run new electrical wire or a single ground wire back to the panel (though the former is highly recommended). A GFCI outlet will cut off the circuit if it senses voltage leaking to ground. If there is no ground wire, it will not function.
hot wires are black, white wires are ground
If this is a home wiring question and the wires are black and white then black is Hot and white is Neutral. If you also have a red wire, it is the other hot wire, and either the black or the red wire to the white one would be 120 volts, and red to black would be 240 volts.
The live wire is the wire that carries electrical current to the light fixture, while the neutral wire provides a return path for the current to complete the circuit. In a ceiling light, the live wire is typically colored black or red, while the neutral wire is colored white or gray. It is important to properly identify and connect these wires to ensure safe operation of the light fixture.
You will first need to determine which wire is the hot wire in the ceiling box. Connect the swag kit's two wires to the hot wire and the neutral wire in the ceiling box, leaving the third wire unconnected. Ensure all connections are secure and insulated. You may need to consult a professional electrician if you are unsure about the wiring.
If the house wiring does not have a white wire, you can cap off the white wire from the track light with a wire nut and electrical tape if necessary. The white wire is typically used as the neutral wire, but if it's not present in your house wiring, capping it off safely will ensure the track light functions correctly with the available black and green wires.
In a typical dryer plug, the two hot wires are usually the red and black wires. The white wire is typically the neutral wire and the green or bare wire is the ground wire. Always consult the manufacturer's instructions to be sure.
Your black wires are your hot wires. The white is your neutral or common. It would be best to run an equipment ground (green wire) too.
black wire is hot wire .And the white is the common or white is ground. Depends on what your talking about in an outlet or car battery. In a outlet the ground wire is green or bare copper. neutral is red and hot is black (I remember it by hot can kill you so black is death) if I am not mistaken. As for a car battery i think it's the opposite red is hot and black is neutral.
Assuming the wires are the correct gauge for application and breaker you use black and white wires as hot. Put red electrical tape on each end of white wire and connect red and black to the breaker output and bare wire to ground lug in panel. At receptacle connect black and red to hot contacts and bare wire to ground lug.
The wires for the left front window are red/black for up and green/black for white. For the right front window, the wires for up are red/white and the wires for down are green.
It sounds like the black wires may be hot wires coming from the power source and the white wires could be neutral wires. The black wires are typically connected to the fixture's black wires. If the black wires aren't connected and capped off, the fixture won't receive power. It's important to properly connect all wires to ensure the fixture functions safely.
You cannot directly connect a 4-wire cooktop to a 3-wire circuit. To do so, you will need to upgrade the circuit to a 4-wire setup by running a new cable that includes the additional ground wire. This is necessary to ensure the cooktop operates safely and meets electrical code requirements. It's recommended to hire a licensed electrician to perform this upgrade.