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US standard power cord color standard, generally black is the live wire, white is the zero wire, and green or yellow-green is the ground wire.
However, there are no mandatory standards or recommended standards in NEC (National Electrical Code). The used 3-core American wire cores are not these three colors, but black, brown, and blue. In most cases, black is used as the live wire. Brown is the neutral wire and blue is the ground wire.
Extended information:
The copper and aluminum rods commonly used in power cords are used to pass through one or several die holes of a drawing die at room temperature to reduce the cross-section, increase the length and improve the strength. Drawing is the first process of each wire and cable company, and the main process parameter of drawing is mold matching technology.
Power cord monofilament annealing: When copper and aluminum monofilaments are heated to a certain temperature, the toughness of the monofilament is improved and the strength of the monofilament is reduced by the method of recrystallization, so as to meet the requirements of the wire and cable for the conductive core.
The key to the annealing process is to prevent the oxidation of the copper wire. Twisting of the conductors of the power line: In order to improve the flexibility of the power line and facilitate the installation of the device, the conductive core is formed by twisting multiple monofilaments. From the twisting method of the conductive wire core, it can be divided into regular twisting and irregular twisting.
Non-regular stranding is further divided into bundle stranding, concentric compound stranding, and extraordinary stranding. In order to reduce the occupied area of the wire and reduce the geometric size of the power line, the stranded conductor is also compressed, so that the ordinary circle can be changed into a semicircle, a fan shape, a tile shape, and a compressed circle. This type of conductor is primarily used on power lines.
To learn more, please refer to: Custom UK Standard Power Cord Company
