In this work, we analyzed the method of designing a power semiconductor converter from a safety standpoint at work environment and the personnel who handle it. The chapter on hazard protection measures provides guidelines on what to determine for individual converter components, such as maximum currents and voltages, also the short-circuit currents. The ways of occurrence of the individual failures and their consequences are explained. The influence of the supply voltage value on the type of insulation is shown, as well as the required distances of available conductive parts from the live parts of the converter. As one of many hazards during the service time, the capacitor discharge is listed. They should be discharged from the remaining charge within a certain period of time, after the main power supply has been switched off, ie the voltage should be reduced to appropriate values. The values of the temperature for certain converter components are defined, as well as the requirements for the housing from a thermal stresses point. Through the chapter on the methods of testing, it is described how the test are performed and the results are given depending on test. During mechanical testing, clearance and creepage distance are measured, the possibility of foreign bodies penetrating the housing and the resistance of the housing to various deformations are examined. Through electrical tests, pulse voltages were used to test the durability of insulating materials and the predicted distances, also the tests with alternating and direct voltages are examined as an alternative. The existence of a galvanic connection on the equipotential bonding circuits was also determined. Methods for testing very dangerous conditions, such as short circuits, overloads, failure of one of the phases and the like, have been identified. Due to incompleteness of the planned version of the converter and inadequate laboratory equipment, the above-mentioned tests were not performed. For this reason, we put another converter of similar topology and parameters into operation, loaded first with small, then with a load that causes the rated current of the converter. During rated current time we measured temperature of IGBT bridge. Mains supply and converter voltages and currents responses were recorded.