Color codes are often used in the United States for power cables in "branch circuits," or the wiring between the last protective device, such as a circuit breaker, and the load (like an appliance). These are frequently seen in homes and offices. The first phase is DarkRed, which is the second phase. Blue Neutral-White Ground-Green,... Phase 3: Black Yellow or Orange.
The third phase depends on what kind of cable you have. If it's old wiring that was originally installed with black cables (not solid colors), then you should use black cables now. If the original cables were white, then you should use yellow cables now. Don't use red or blue cables! Those are dangerous if you're not sure what they were originally colored. You could get shocked if you touch these wires when there's electricity flowing through them even though they appear to be dead.
In general, follow the same rules for electrical work that you would follow for any other type of construction project. If you're not sure what to do, call a professional electrician.
Electrical Wiring Color Codes in the United States
In the United States, color codes for AC power circuit wiring are used. Green or green with a yellow band serves as the protecting ground. The neutral wire is white, the hot (live or active) single phase wires are black, and the second active wire is red. Red, black, and blue are the colors of three-phase lines. A fourth color, usually gray, is used to fill in gaps in the wiring system.
These colors are not meant to be permanent or accurate representations of all the wires in a building. In fact, electric circuits can have many different combinations of colors. Some buildings use black for one circuit and then another circuit uses red instead. Others may alternate between black and red within a room. This means that in order to avoid interrupting any voltage on a particular circuit, multiple wires of each color should be used throughout the building.
Circuit breakers and other electrical equipment need only two colors of wire to operate correctly. If you're working with old wiring and don't see any color coding, assume that you have live electricity at all times. When there's a problem, it's best to call an electrician immediately so they can find the source of the issue.
In the United States, color codes for AC power circuit wiring are used.
|Protective ground||PG||bare, green, or green-yellow|
|Line, single phase||L||black or red (2nd hot)|
Electrical Wire Color Coding Standards | Wiring Colors The United States has its own wiring colors for electrical circuits. For 208 VAC three-phase, black, red, and blue are used; for 480 VAC, brown, orange, and yellow are used. These colors are called de-energized colors because they will not cause any danger if you come in contact with them while working on a circuit.
These colors help electricians identify which cables are hot, which are neutral, and which are ground. They also provide information about the current flowing through the line or cable. A conductor within the cable is colored according to its function: black for hot, red for neutral, and blue for ground.
The term "wire" as used in this article refers to an insulated copper conductor within a metal sheath. Coaxial cable is one type of wire that is commonly used within communications systems. Other types of wires include unshielded twisted pair (UTP) cable, shielded cable, and fiber optic cable.
Copper is the preferred material for conductors because it is strong and lightweight. But other materials can be used instead, such as aluminum, which is cheaper than copper. Conductors must be able to carry electricity without breaking down. So for most applications, they must be made from a material with a high resistance to heat and stress. Copper maintains its strength even at very low temperatures.
The United States has its own wiring colors for electrical circuits. For 208 VAC three-phase, black, red, and blue are used; for 480 VAC, brown, orange, and yellow are used. Colors of Wiring: Electrical Wire Color Coding Requirements
|Line 1 (L1)||Red|
|Line 2 (L2)||Yellow|