Knowing the type of current that different types of wire carry, specifically positive or negative current, is very important. It is especially vital when you are dealing with electrical fixtures. Not all wires are labeled as either positive or negative. In such cases, you should go ahead and check the physical characteristics of which color is outstanding. color coding is by far the most commonly used method of labeling polarity in wires.
Which wire carries negative current, white or black? If you have a combination of white and black colors, the white wire carries a negative current while the black wire carries a positive current.
To identify the positive current wire in a circuit or electrical fixtures with black, white, and green wires, just keep in mind that the white wire is the negative one. The black wire will be the one carrying the positive current, and the green wire will be the ground.
The Simple Answer
Can the white wire be negative? Yes, the white wire can be negative. Most people are used to the red wire being positive and the black negative; however, in some devices the white wires are negative while the black ones are positive.
The Different Types of Wire Color Codes
Many colors are used to distinguish wire polarities today. These colors include black, red, white, blue, green, grey, and yellow. The most common wire color combination is black and red.
Wire color codes play an important role in sensitizing the average citizens/employees on the dangers posed by the electrical connections. color code illiteracy can cause immense damage to facilities, homes, and individuals. That is because electricity has become a part of society, and there is no electricity without wires. Understanding which color carries which current will greatly help to prevent accidents due to wire code illiteracy.
Let us, therefore, go through the wire color coding:
- The red and black wires: – In this combination, the black wire is the positive wire while the black is negative.
- White and black wires: – In this case, the white wire is the negative wire while the black one is negative.
- The green and grey wires: – Those are the ground wires which dissipate the electrical current to the ground.
Wire Marking Colors for DC Power
DC power is used in devices such as batteries, solar cells, and fuel cells. This type of current travels in a straight line and it is very consistent. However, the major drawback of DC is that it cannot travel larger distances like AC power. (1)
The color coding for DC wires is as follows:
- The positive current wires are labeled red
- The negative current wires are colored and black
- The ground wire is marked red or grey.
The Color Coding for the AC Power
Alternating Current, AC, flows in a sinusoidal waveform and travels to a larger distance as opposed to the Direct Current, DC. AC is therefore the best way to ferry electrical current to distant locations or consumers. (2)
The AC power in many forms has different voltages of power fragments. In an AC wiring system, there are different phases where each is designated or marked with a unique color. Wire coding helps in the identification of the various phases which have different volts or power.
In wires with 120, 208, and 240 volts, the following color codes apply:
- Phase 1: colored black
- Phase 2: colored red
- Phase 3: is colored blue
- Neutral wiring is colored white
- Green and grey colors can be used to mark ground wiring
- High-leg connections are marked orange
High-leg connections are rare, and they imply that the phase (marked orange) has a higher voltage than the others.
Take a look at some of our related articles below.
- Can I connect red and black wires together
- How to tell negative and positive wire
- How to identify neutral wire with multimeter
(1) solar cells – https://www.acs.org/content/acs/en/education/resources/
(2) consumers – https://www.sciencedirect.com/topics/psychology/