The invention relates to a passive component for determining the quality and condition of the insulation system of an electric motor. This is used in particular to create a forecast before the failure of the engine, for example, a breakdown between two phases. The present invention provides for the first time a passive component, such as a test strip, by means of which, during operation of an electrical machine, the stresses which act on the insulation system, such as the winding, by partial discharges and / or voltage peaks can be detected, for example visually, by the insulation system.
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