Like black wires, they can be used for as ungrounded conductors. Black wires should never be used for a neutral or ground connection. Hot wires are used to feed a switch or an outlet. De-Coding Electrical Wire Color Codingīlack Wires Wires with a black insulation coating are always used as hot wires, or ungrounded conductors. Here’s a quick guide to electrical wire color coding. Electrical wire color coding is designated by the National Electric Code (NEC). Within the home, wires in the 120V circuits are color coded to indicate type and size, while the color of the insulation coating indicates function. ![]() Combining the two legs will provide 240V service, used to supply heavy loads for large appliances such as air conditioning compressors. Incoming 240V power is split onto two legs, which each conduct 120V hot-to-neutral power. Electrical wiring and voltage varies around the world, but here in America most homes are wired with 120/240V electrical service. Color code your wires properly to help guide anyone who later tries to make repairs on your electrical system. Understanding the electrical wire color coding system and knowing the function of each wire is important to make sure you are using them appropriately and safely. ![]() Have you ever encountered a rainbow-colored jumble of electrical wires and not known what how to tell them apart? Electrical wires are color-coded according to purpose.
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