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The voltage and current responses induced on a multi-conductor transmission lines (MTL) network with some nonlinear devices are studied in this paper, which is placed in a cabin with thin slots on its wall. The mathematical treatment is based on the finite-difference time-domain (FDTD) method combined with telegraph equations and modified nodal analysis (MNA) method. The accuracy of our developed algorithm is checked, with good agreement obtained by comparing some results with those obtained by CST MWS studio. However, it should be noted that CST cannot simulate the case of MTL loaded with arbitrary nonlinear devices. Further, transient analysis of an external field coupled into a cabin is performed, with some inner EMI effects characterized accurately.