Indoor Telephone Wires

The basics of phone line wiring is pretty easy to understand. 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.

One telephone wire line needs only two wires. Therefore, it follows that a 4-strand telephone wire can carry two separate phone lines. The twisting keeps the lines from interfering with each other. IF you need to run more lines than just two, you may just want to use a 6-stand or higher. Telephone wire comes in two gauges, 22 gauge and 24 gauge; 24 gauge is today’s standard.