This final paper deals with the topic of electromagnetic radiation from extremely low frequency fields, more precisely from 10 kV, 110 kV and 400 kV power lines, with the aim of proving that the radiation values are below the permissible limits. Radiation is the phenomenon of energy spreading in the form of waves or particles (ionizing radiation) or in the form of electric and magnetic fields (non-ionizing radiation). Ionizing radiation penetrates the interior of the human body and directly affects cells, while non-ionizing radiation only affects the surface of the skin. Electromagnetic radiation is a form of non-ionizing radiation. With regard to frequency or wavelength, EM radiation is divided into a spectrum consisting of gamma radiation, X-rays, UV rays, IR radiation, the visible spectrum and radio waves. By concentrating on extremely low frequency fields (50 Hz), more precisely household appliances, power plants and power lines, which are the main topic of this paper, we take into account the fact that electric and magnetic fields can be considered separately. Below the power line, the electric field is of constant value as long as the lines are energized, while the magnetic field varies depending on the load current. From Maxwell’s equations, which are the foundations of theoretical electrical engineering, formulas are derived that describe how the values of the electric and magnetic fields depend inversely on the distance from the power line, i.e. that the field decreases with distance from the power line. In the Republic of Croatia, regulations have been adopted that define the limit values of electromagnetic radiation, in the categories for professional exposure, the general population and particularly sensitive areas, which are, in turn, increasingly strict. Measurements in residential areas have shown that in some devices such as vacuum cleaners and stoves, the magnetic field (electric motor, induction) prevails, while in DVB-T the electric field prevails. By measuring the electric and magnetic fields in three spatial axes, results were obtained that show that the radiation from power lines 10 kV, 110 kV and 400 kV is far below the prescribed limit values. Therefore, all misconceptions about the harmfulness of power lines have been refuted.