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In this paper, the high-frequency coupling from electromagnetic fields to cables is studied and this under (i) plane-wave conditions representing a susceptibility test in a semi-anechoic room and (ii) random wave conditions representing a more realistic environment with many reflections. Two set-ups are considered. First, a simple wire above an infinite ground plane. Second, a more realistic set-up representing a desktop device with attached cables whose layout is according to EN 55016-2-3:2006 . It is shown that for frequencies above 1 GHz the induced (worst-case) current at the side of the device under test can differ significantly between plane-wave and random wave conditions. Moreover, the random wave condition does necessarily not lead to the highest induced currents.