Whether it is maintenance or any kind of work which is preformed by human on galvanically separated non-active parts of the busbar sistems or on substations equipment in general, a short circuit current may occur, which is why there is a need for efficient and portable protective equipment that would allow a certain protection zone where the risk of dangerous contact voltage would be removed. Such devices are referred to as devices for temporary earthing and shortcircuting. The aim of this paper is to present the methodology for selecting these devices and their implementation in electrical switchgears. To do this, it is necessary to consider in detail all the chapters of this paper. Calculation required to calculate the width of the protection zone for two caracteristic cases of dangerous contact voltages were preformed on classically air-insulated medium-voltage electrical switchgear. Based on the calculation of the minimum width of the protection zone, the number of positions for the concetion of previously mentioned devices has been calculated, and these positions are shown on the three-phase scheme of classically airinsulated medium-voltage electrical switchgear.