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The line network takes high-frequency interference voltages at the function of devices could negatively affect. Before these high-frequency interference voltages protection of the mains filter the connected devices. The of high-frequency noise caused by humming, noise or interference can crack in audio equipment or image errors in display devices. They occur if, for example when other devices can be turned on or large-scale consumers, such as washing machine or vacuum cleaner are in operation.This text is machine translated.