This experimental research work presents the design and construction of a dummy with a shape and weight that resembles a real person. The dummy was used to determine the increase in electrical potential that a person could experience due to lightning currents while lying on the surface of the conducting floor of a Faraday Cage-like shelter, constructed to mitigate the effects of ground lightning currents. The experimental arrangement used and the results of the voltage transferred to the dummy are presented. The dummy is placed in two different positions inside the conductive shelter, when 8/20 μs currents of different amplitudes are applied to the floor of the conducting shelter. Finally, the energy transferred to the dummy is estimated and compared with the levels that could represent a risk for a person.