They connect to the grounding terminal in an outlet box and run to the ground bus bar in an electrical panel. The purpose of green wires is to ground an electrical circuit. While they’re called “neutral” wires, they may still carry a current, especially if the current load in the circuit is unbalanced, so handle these wires cautiously. White and gray electrical wires can only be connected to one another. The purpose of a neutral wire is to connect to the neutral bus bar, a conductive piece of metal within an electrical panel that attracts the electric current for distribution throughout the house. White is most commonly used, but gray wires serve the same function. If you find wires in either of these colors, you’ve located the neutral wires. Then, blue wires are most often used as travelers for three- or four-way switches (for instance, if you have switches at the top and bottom of a staircase that control the same light, that’s a three-way switch). For example, you might see yellow wires as switch legs to ceiling fans, structural lights, and outlets paired with light switches. Instead, blue and yellow wires are used as the live wires pulled through a conduit. While wires in these colors carry power, they are not used in typical outlet wiring. It’s possible to link two red wires together or a red wire to a black wire. In addition, red wires are used to connect hardwired smoke detectors to the home’s power system. Like black wires, they can also be used in some types of switch legs. In 220-volt circuits, red wires are the secondary live wires. Consider all black wires to be live at all times. Also, black wires are often used as switch legs in circuits, which is the connection linking a switch to the electrical load. This color of wire is used to transfer power to switches and outlets in all types of circuits. What the Color of an Electrical Wire Means Black Electrical Wires If you have any hesitations at all, leave electrical work to a qualified professional. Just remember, all electrical wires could carry a current at some point, so treat every color wire with equal caution. Learning these electrical wire color codes before attempting any type of do-it-yourself (DIY) electrical system repair is critical. Specific colors identify each wire’s function in a circuit. If you live in the United States and your home was built after the 1940s (or your outdated wiring has since been updated), you can expect the electrical wires behind your walls to follow certain color standards.
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