Many industrial systems require the transmission of electrical current from a static part to a rotating one. This is achieved by a sliding contact within a slip-ring device. According to the applications various designs can be used as well as various materials for the brush ring contacts. These devices usually have to be fully operative for many years. Understanding the wear mechanisms and the electrical behaviours are of major interest. This work presents a set-up for the investigation of electrical and tribological behaviour of sliding contacts of the wire/ring type. Fitted with a special wire holder, a rotating pin-on-disc tribometer (Anton Paar TRB3) was used to allow the friction of a wire on a disc. The gold wire is the same as in a real slip ring device and the brass discs have the same gold coatings as in the real slip rings. Voltage drop through the interface is measured with the 4-point probes method. Data such as friction coefficient, rotational speed and voltage drop are measured via the tribometer software. A second acquisition system is synchronized to the tribometer and allows the measurement of the voltage drop and rotational speed with high acquisition rates. This set-up allows the investigation of various parameters such as rotating speed, current value, normal force, roughness and lubrication conditions. It is an essential tool to identify degradation mechanisms in a simplified geometry with the aim of helping the analysis of results of tests performed on the real slip ring systems.