NBN EN 61643-21:2002现行
Low Voltage Surge Protective Devices - Part 21: Surge Protective Devices Connected To Telecommunications And Signalling Networks - Performance Requirements And Testing Methods
出版：Belgian Standards
专家解读视频
2002 AMD 2 2013 [01/02/2013]2002 AMD 1 2009 [03/11/2009]2002 [01/03/2002]
DIN EN 61643-21 (2010-03) - Identical
BS EN 61643-21:2001+A2:2013 - Identical
DIN EN 61643-21 (2013-07) - Identical
UNE EN 61643-21:2002 - Identical
SS EN 61643-21 Ed. 1 (2002) - Identical
I.S. EN 61643-21:2001 - Identical
NF EN 61643-21:2001 - Identical
DIN EN 61643-21 (2002-03) - Identical
BS EN 61643-21:2001+A1:2009 - Identical
SN EN 61643-21:2001 - Identical
DIN EN 61643-21:2013 - Identical
SS EN 61643-21:2002 - Identical
