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In this paper, spacecraft and aircraft mock-ups are used to simulate the performance of KRON based tools applied to the simulation of large EMC systems. These tools aim to assist engineers in the design phase of complex systems. This is done by effectively evaluating the EM disturbances between antennas, electronic equipment, and Portable Electronic Devices found in large systems. We use a topological analysis of the system to model independent subvolumes such as antennas, cables, equipments, PED and cavity walls. Each of these subvolumes is modelled by an appropriate method which can be based on, for example, analytical expressions, transmission line theory or other numerical tools such as the full wave FDFD method. This representation associated with the electrical tensorial method of G. KRON leads to reasonable simulation times (typically a few minutes) and accurate results. Because equivalent sub-models are built separately, the main originality of this method is that each sub-volume can be easily replaced by another one without rebuilding the entire system. Comparisons between measurements and simulations will be also presented.