The bottom line (L; formerly, live, or phase) Color-coded power-carrying core/wire in a typical low-voltage or household installation. The color brown (pre-2004, red). Neutral (N): the power-carrying core/wire in a typical low-voltage or home installation, which is normally linked to earth (ground) voltage by the provider; color-coded. Orange (pre-2004, black). Live (L): the hot power-carrying conductor in a three-wire service. It must be separated from neutral and also from earth (ground) at both ends of the service call area.
Live conductors are usually larger in size than neutral conductors for easier work with tools such as cutters, drills, and pliers. They are also usually marked with blue or black tape to indicate their status as live or neutral. In some cases where there is only one conduit into which all three wires enter, it may be difficult to determine exactly what role each wire plays until you get them into your house or office. For example, if there is no equipment attached to any of these conductors, they can be either live or neutral. If you were to touch them without first putting them into circuit with something else, you could be shocked.
Household electricity is transmitted to homes over long distances by means of power lines. These lines transmit alternating current (AC) at high voltage from a generator located near a nuclear power plant to local substations. From here, the electricity is distributed to houses throughout a city, town, or neighborhood.
The active wire (high potential) is brown in color (it used to be red). Blue is the color of the neutral wire (low voltage). The earth wire is green and yellow striped (it used to be only green).
An electrical system is called neutral-grounded if the ground conductor is also called a neutral. This provides an alternative path for current to follow in case of a problem with one branch. The normal situation is that there is no connection between the neutral and the ground conductor. But in some cases, it may be necessary to connect them together. For example, if you were to cut the neutral conductor, you would want another path for the current to follow instead. Otherwise, you might get a shock from any other conductor that has electricity on it.
In terms of wiring colors, the term "active" means that this wire carries a direct current (DC) back and forth through a device such as a light bulb or motor. The term "neutral" means that this wire connects two different parts of the circuit to give a complete path for current to follow. The term "earth" means that this wire is connected to something conductive such as soil or metal piping, so that any charge that builds up on the cable will be able to flow out into this part of the circuit.
Dave, an Electrical Safety Expert, responded. The living red turns brown. The neutral black is transformed into blue. The earth's cables remain green and yellow. These colors should be used on all equipment that might be connected to the wall socket.
Red means danger in the electrical system and must never be used for cable color. Red cable should always be identified as such on buildings older than 1975 when red wire was first used in residential wiring. If red wire is needed for new construction after this date, it should be included with white and black cable during installation.
If you're not sure what color a cable is, check its insulation first. Black cable has metal strands inside the sheath while red cable does not. The presence of metal will be evident by its color. If the cable is red but appears to be damaged, have it checked by a qualified technician.
Cable markings can be found just about anywhere cable is used in an building. Pay attention to which colors are used in connection with any given circuit breaker panel. This will help you identify circuits that need to be redirected or replaced if they become unserviceable due to damage.
Building owners should also be aware of how they plan to use cable in their facilities.
L1 and L2 are what color?
| Function | label | Color, common |
|---|---|---|
| Neutral | N | white |
| Line, single phase | L | black or red (2nd hot) |
| Line, 3-phase | L1 | black |
| Line, 3-phase | L2 | red |
The red one (+) is positive, whereas the black one (-) is negative (-). Never connect the red cable to a vehicle's negative battery terminal or a dead battery. Always use the red cable to connect only other red cables or devices that provide power to the ignition switch on your car. If you connect it to a live battery or a working radio system, this could be very dangerous. The voltage needed to start a car is about 12 volts. If you connect a digital camera's flash card to an automobile's power source, always use the red cable to prevent electrocution.
Digital cameras need electricity to work so they can take pictures and store them on the memory card. Before connecting your camera to a vehicle's power source, make sure that nothing is connected to the negative side of the battery. If you have any questions about which cable goes where, please contact an expert before you begin work on your car.
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