Täytejohtimen

Täytejohtimen is a Finnish term that translates to "filler conductor" or "dummy conductor" in English. It refers to a conductor that is included in an electrical cable assembly but does not carry any electrical current. These conductors serve a variety of purposes.

One common function of a täytejohtimen is to provide mechanical support and maintain the shape of the cable. In cables with uneven numbers of insulated conductors, a täytejohtimen can be used to fill the void and ensure a round or symmetrical cross-section. This symmetry is important for the cable's flexibility, ease of installation, and to prevent stress on the insulated conductors during bending or pulling.

Täytejohtimet can also serve as a grounding or shielding element, although they are not always connected to earth. In some cases, they might be used to absorb electromagnetic interference or to act as a potential equalization path. They can be made from various conductive materials, such as copper or aluminum, and are typically insulated or left bare depending on their specific role within the cable. The presence and type of täytejohtimen are determined by the cable's intended application and performance requirements.