Analysis of influence of low voltage cable terminal box on magnetic field levels in the apartment and shielding solutions

The paper is related to the topic of protection of the general public from electromagnetic fields and it analyses the levels of magnetic flux density in the apartment that occur due to the influence of a cable terminal box. In the analysed example it is located on the outer wall of the apartment, which leads to increased levels of magnetic field in the room located on the other side of the wall. For that reason, it is necessary to examine the levels of magnetic field in the apartment and to check if they are within the limits prescribed by national and international legislation. The magnetic flux density levels in the apartment are determined by calculations based on 3D modelling of the magnetic field source. It was concluded that the magnetic field values in the apartment were not negligible, as a consequence of the proximity of the magnetic field source. Therefore, the possible solutions for the reduction of magnetic field levels in the apartment were analysed. Different configurations of shielding systems based on passive shields are considered. The effect of these shields on the reduction of magnetic fields is verified by calculations based on 3D models of the shields.