Power by wire concept is a novel trend in modern electrical systems. Hence, system networks have become more and more sophisticated, and their modeling is no longer an easy task. In this paper, we propose an analytical analysis of a global EMC of a modern electrical network. Explicitly, we develop an analytical model to evaluate differential mode impedance at different sites of a complex network. To this end, we use a Transmission Line "TL" theory applied in the case of bifilar cables. Bifilar cable parameters, such as the propagation constant and the characteristic impedance, are identified by measurement via the impedance analyzer Agilent 4294A. Such parameters are included into the analytical model for the computation process. The impedances, computed at different sites are compared to each other, and on the same time, to the impedance of Line Impedance Stabilization Network (LISN) in accordance with the CISPR 22 standard. To assess the model performance, we have carried out an experimental test bench. The measured impedances agree with those computed analytically.