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How to Install Junction Boxes: Connect the Wires
Wires Connected Together in a Junction Box
After the box is secure, use linesman pliers to twist the wires together. To do this, join like colors, black to black, white to white, bare copper to bare copper and twist them together evenly. Add a wire nut to cover the connection. In this case, I'm using red wire nuts to make the connections. You may want to use a green-colored wire nut on the ground (bare copper) connection to symbolize the ground connection.
Learn About Electrical Wire