For example, you might see this if you have a light fixture with a three-way switch or a ceiling fan. These all typically mean there are other switches. In some cases, you might notice yellow or blue wires in the junction box or other colors. If you see a red wire in the ceiling, it usually represents a switch that will control the light fixture. The same goes for the black and white wire in the ceiling. The white wire is the ground wire and is neutral, while the black wire is live. In a simple fixture with one light switch, you would perhaps have a black and white wire in the fixture. Usually, the different colors of the wires represent specific things. This makes replacing an existing fixture with a new one reasonably easy–until you realize your fixture has two black wires. Normally, light fixtures feature different color wires that match the wires in the electrical box in the ceiling.
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