
Low Voltage Surge Protective Devices - Part 21: Surge Protective Devices Connected To Telecommunications And Signalling Networks - Performance Requirements And Testing Methods
出版:Polish Committee for Standardization

專家解讀視頻
2004 AMD 2 2013 [12/06/2013]2004 AMD 1 2009 [27/05/2009]2004 [01/07/2004]2002 [15/09/2002]
AMD 1 2009 is only available in English. (06/2009) AMD 2 2013 is only available in English. (07/2013)
IEC 61643-21 Ed. 1.0 - Identical