A color scheme for insulation on power conductors was introduced for safety purposes, and easy identification of the right wire. A formal color coding is mandatory for standardized electrical code, while the rest are optional. Codes are modified as and when they are revised, which results in different colors for older installations. Due to insulation exposure to heat, light and aging, the shades and colors of the codes may sometimes vary. The local rules are different in every area, due to which exceptions exist in the colors of wires and cables.
International standards were adopted because of its distinctive appearance, which reduced the likelihood of danger. To identify the safety of a wire, simple color codes are used. Through these codes, people can now easily recognize the wire that is safe. Awareness of simple codes like a yellow wire wrapped around a green wire is the the earthing wire. This wire is also known as the grounding wire, one that leaves the current in the ground causing zero harm to a person while handling it. There are people who cannot recognize the color red and green because of color blindness; hence, the color yellow was finalized as the color for earthing wires. When people work on house electrical wiring, they can work without any tension, when they see a yellow wire wrapped around the green wire.
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