
LOW VOLTAGE SURGE PROTECTIVE DEVICES - PART 21: SURGE PROTECTIVE DEVICES CONNECTED TO TELECOMMUNICATIONS AND SIGNALLING NETWORKS - PERFORMANCE REQUIREMENTS AND TESTING METHODS
出版:British Standards Institution

專家解讀視頻
Pertains to devices for surge protection of telecommunications and signalling networks against indirect and direct effects of lightning or other transient overvoltages.
SN EN 61643-21 : 2001 - Identical
I.S. EN 61643-21:2001 - Identical
NF EN 61643-21 : 2001 AMD 2 2013 - Identical
DIN EN 61643-21 : 2013 - Identical
NBN EN 61643-21 : 2002 AMD 2 2013 - Identical
UNE EN 61643-21 : 2002 - Identical
NF EN 61643-21 : 2001 AMD 2 2013 - Identical
NBN EN 61643-21 : 2002 AMD 2 2013 - Identical
UNE EN 61643-21 : 2002 - Identical
SN EN 61643-21 : 2001 - Identical
EN 61643-21 : 2001 AMD 2 2013 - Identical
DIN EN 61643-21 : 2013 - Identical
I.S. EN 61643-21:2001 - Identical