Copper is one of the most important non-ferrous metals, thanks to its good properties it is still irreplaceable in the application for conductors of electricity, and in other uses. Copper in its as cast state is not applicable in the production of conductors for several reasons. Deformation and recrystallization processes are subsequently performed to improve its properties. The research in this graduate thesis was conducted on a copper wire produced by the UPCAST vertical casting process and subsequently cold drawn. The as cast wire with a diameter of 8 mm was subsequently reduced to the final dimension by a continuous drawing process through several dies up to the wire thickness of 2.6 mm. During the production and processing of copper wire, various changes in structure, mechanical properties and electrical properties occur. In order to observe these changes, structural and hardness tests were performed and wire conductivities were measured at individual stages of production. The tests were performed on the wire at reductions of 24, 46 and 67.5%. The test results describe the structural changes that occur after the implementation of individual reductions, as well as the influence of reduction on the hardness and electrical conductivity of the wire, as well as the impact of the thermal annealing process on the structure and conductivity of copper wire. The results indicate that the initial coarse-grained structure in cast state, during reduction brakes down into a fine-grained structure orientated in the direction of plastic deformation. As a result, the conductivity is reduced, which is changed by subsequent heat treatment. After heat treatment a good conductivity is achieved while maintaining the better mechanical properties of the wire. Structural studies also indicate that after heat treatment, twin crystals form in the structure of the copper conductor.