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Hydrogen Technologies Standards form the basic framework for market ramp-up
More information
Climate change Standards and specifications support climate targets
More information
Smart Farming Standards and specifications are drivers for the digitalization of agriculture
More information

Standards [CURRENT]

NF C61-744-21/A1 ; NF EN 61643-21/A1:2009-06-01
Low voltage surge protective devices - Part 21: surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods

Title (German)

Überspannungsschutzgeräte für Niederspannung - Teil 21: Überspannungsschutzgeräte für den Einsatz in Telekommunikations- und signalverarbeitenden Netzwerken - Leistungsanforderungen und Prüfverfahren

Edition 2009-06-01

Original language French

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Terminology

Hydrogen Technologies Standards form the basic framework for market ramp-up

Climate change Standards and specifications support climate targets

Smart Farming Standards and specifications are drivers for the digitalization of agriculture

NF C61-744-21/A1 ; NF EN 61643-21/A1:2009-06-01 Low voltage surge protective devices - Part 21: surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods

Want to learn more?

NF C61-744-21/A1 ; NF EN 61643-21/A1:2009-06-01
Low voltage surge protective devices - Part 21: surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods