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There are two forms of electromagnetic interference. That is, the interference energy generated by the unwanted electromagnetic field emission and current. The Federal Communications Commission (FCC) and similar institutions in Germany, Verband Deutscher Elektrotechniker (VDE), have established regulations governing electromagnetic interference and related safety standards. When designing a cooling fan product, engineers must first consider the need to eliminate noise or eliminate the ground loop. Using a dedicated capacitor or a special toroidal core can improve the electromagnetic interference problem.