There are several applications of tailored carbon fiber materials in the automotive, wind energy or aircraft industry. Electrically conductive fibers possess e.g. the potential for sensing or heating applications, e.g. by insertion into fabrics or lightweight constructions. An electrically conductive bicomponent fiber with core-sheath geometry has been developed. The core component consists of an electrically conductive carbon nanoparticle (GNP) based polymer composite covered by an insulating polymer sheath. Despite electrical insulation the sheathing with a polymer guarantees resistance against abrasion and the washing processes. A conductive polymer composite based on polycaprolactone (PCL) and containing a mixture of carbon black (CB) and multi-walled carbon nanotubes (CNT) was developed for the conductive core. The sheath consists of polyamide-6. Based on these materials a laboratory and pilot spinning process was developed for bicomponent melt spinning machines: After melting the two polymer components by extrusion, the core- sheath geometry was formed in the spinning nozzle. After crystallization the filaments are post-stretched and winded up. Due to the higher melting temperature of the sheath the conductivity of the core could be increased by thermal annealing. The conductivity increase of the CB/CNT filler network is due to the reformation of filler network after the process induced rupture. For electrical measurements several methods for contacting the conductive core were developed and tested. Electrical conductivity was measured for different CNP compositions and processing conditions. Furthermore, the electrical conductivity of the fibers was measured in a tensile test arrangement together with the strain-stress-curves. The possibility to scale-up the production of electrically conductive bi-component fibers has been shown. Future challenges are an improved stretchability of the fibers for subsequent weaving and an improvement of the spinning process.