Telephone wiring is color-coded red, green, yellow and black. They are used in pairs for each phone line you have. Repairmen in fact refer to the wires in terms of pairs, so technically a standard four wire telephone line has two pairs.

What do the different colors on telephone wires mean?

Each pair can be used as a phone line, so in this example you can use this cable for up to four phone lines. The primary color of the conductor is the first color listed, the second color is the tracer. As an example using the White/Blue conductor, white is the primary color and blue is the tracer.

What Colour wire goes to L and N?

The N is for the neutral side or the white wire, and the L is for the load side, the black wire.

What is L and N reverse?

If your outlets polarity is reversed, it means that the neutral wire is connected to where the hot wire is supposed to be. This may not sound like a terrible thing, but it is.

What do telephone wires look like?

Most telephone wire are one or more twisted pairs of copper wire. The most common type is the 4-strand (2 twisted pair). This consists of red and green wires, which makes a pair, and yellow and black wires, which makes the other pair.