标签: itu-k

ITU-KINTERNATIONALTELECOMMUNICATIONUNIONITU-TTELECOMMUNICATIONSTANDARDIZATIONSECTOROFITUK.21(07/2003)SERIESK:PROTECTIONAGAINSTINTERFERENCEResistibilityoftelecommunicationequipmentinstalledincustomerpremisestoovervoltagesandovercurrentsITU-TRecommendationK.21ITU-TRecommendationK.21ResistibilityoftelecommunicationequipmentinstalledincustomerpremisestoovervoltagesandovercurrentsSummaryThisRecommendationspecifiesresistibilityrequirementsandtestproceduresfortelecommunicationequipmentwhichisinstalledinoronacustomerpremisesbuilding.OvervoltagesorovercurrentscoveredbythisRecommendationincludesurgesduetolightningonornearthelineplant,short-terminductionfromadjacenta.c.powerlinesorrailwaysystems,earth……