Wednesday, October 21, 2015

Electrical Wire Color Codes

You don’t have to be an electrician to realize that some wires are different colors when it comes to electrical wires in your home. These colors aren’t just there for decoration - each one specifies a different function. It’s important to understand what each color stands for so you can stay safe when dealing with electrical devices in your home.

Red wires are used in some types of switch legs and often make up the interconnection between smoke detectors and the power system. They indicate the secondary live wires in a 220-volt circuit and you can connect them to other red wires or black wires.

Green wires indicate the grounding of an electric circuit. They can only connect to other green wires to provide a path to ground for a circuit’s current.

Yellow and Blue
These wires are used to carry power but are not meant for wiring the outlets of common plug-in electrical devices. Yellow wires are most commonly used as switch legs to fans, lights and switched outlets and blue wires are mainly used for three-way or four-way switches.

White and Gray
White or gray wires indicate a neutral wire. White and gray wires can only be connected to other white or gray wires and they can carry current.

This color is used for power in all circuits. Always use extreme caution when dealing with black wires because they are considered “hot” or “live”.

For more information about electrical wires contact your friendly neighborhood electricians at GEN3 Electric.


  1. It is necessary to know the function of each of the wires. They have some importance in various electrical devices. We need to understand the difference between them.

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  5. This is very useful and relevant information, because if you do not know the basic notation, then it is impossible to understand the question on your own.

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