The aim of the final paper was the overview of the most often used methods for testing electrical installations with an emphasis on the measuring procedure. Measurements are usually performed on installed equipment and real conditions. The usage of equipment and the knowledge of procedures requires certain skills of the person measuring as well as following all the safety procedures. In the second chapter of the final paper the testing of the continuity and resistance of equipotential bonding conductors is described. The data about minimal cross section of the conductor and the maximal length before exceeding border values is shown. In the second part, the procedure of using the metal elements for equipotential bonding is described and the procedure of measuring resistance is shown. In the third chapter, the testing procedure of insulation resistance is described. The procedure of testing insulation resistance for group and individual testing is shown. Likewise, the procedure for the measurement of insulation resistance for the three-phased system, the data of the voltage for testing and allowed minimal resistances are described. In the fourth chapter, the differences between TT, TNS and TNCS systems are shown as well as the corresponding earth fault loops for all cases. The method of measuring fault loop impedance is also shown along with connecting the measuring devices. In the fifth chapter the procedures of testing current circuit breakers are shown. The basic divisions, the work principles, advantages and disadvantages of the circuit breakers are presented. The testing procedure for ELCB is not shown because it is being replaced by new solutions, however, the RCD breaker testing procedure by the device for testing the breaker speed reaction is presented.