Experimental Characterization of Reinforced Concrete Cable Ducts

When a building is struck by lightning in an industrial facility, a partial lightning current can flow through the reinforcement of cable ducts, causing interference to the cables routing inside. The distribution of the lightning current among the paths leading away from the building depends on their impedance. In this paper, we present the impedance measured in two different cable ducts: one duct with a wire-tied reinforcement and the other with a welded reinforcement. The measurements are compared to the results of numerical simulations carried out using the FDTD method.