Correctly stripping a telephone cable

If you want to install a telephone socket in your house, you have to deal with the telephone installation cable. This can pose challenges due to the different implementation options. Correct stripping is also important when connecting. We explain how to do it.

Types of telephone cords

As if the many different colored sheathed wires under the sheath of a telephone cable couldn't cause enough confusion. With the different numbers of cores, core cross-sections and colors, there are also different types of sheathing. In order for you to be successful in connecting a TAE (telecommunications connection unit, i.e. telephone socket), you not only have to clamp the correct wires in the correct connection poles, but also strip the wire ends correctly.

You should also know that telephone cable cores can be "packed " in different ways. The following layers can follow one another from the inside out:

  • Core: conductor made of copper wires
  • PCV insulation around each individual conductor (in different colors)
  • possibly. Shielding made of plastic-laminated aluminum foil with drain wire
  • Gray or white PVC outer sheath

This conglomerate of insulation is intended to protect the conductors against mechanical damage on the one hand and against electrical interference factors on the other. Depending on the wall thickness and material quality of the insulation sheathing and the presence of shielding, the cable has a higher resistance to cable breaks, temperature fluctuations and electrical or magnetic influences that disrupt the signal flow.

Correctly strip the insulation of a telephone cable

What is to be removed from the insulation if a cable is to be connected to a telephone socket?? In the end, of course, everything - because the inner copper wires of the cores have to come into direct contact with the connection poles, i.e. be jammed with them.

Remove the outer coating

For connection, however, a relatively large piece of the external insulation should first be removed from the cable end so that the individual wires can be spread apart from one another to a sufficient extent and led to the different connection poles. So first remove the gray or white outer sheath with a wire stripper or a cutter. Be careful not to damage the insulation of the wires (if there is no shielding directly underneath). It is best to cut into the outer casing only slightly and then bend it off.

Remove shielding

If there is a shielding layer, score it lengthways, pull it back to the cut edge of the outer sheath and cut it off with a wire cutter along with the drain wire.

Remove core insulation

The insulation of the single veins isolate with a stripping forceps only so far that they can be inserted sufficiently deep into the connection poles.