1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Construction
6 Electrical characteristics
6.1 GDT spark-over voltage
6.2 GDT glow voltage
6.3 GDT arc voltage
6.4 GDT d.c. holdover voltage
6.5 GDT capacitance
6.6 GDT oscillation
7 Electrical ratings
7.1 GDT surge current capability
7.2 a.c. discharge current test
8 Application examples
8.1 Two-electrode and three-electrode GDT comparison
8.2 Surge bonding
8.3 GDT pass under protection for a.c. fault conditions
8.4 GDTs in a.c. mains applications
8.5 Hybrid protectors
8.6 GDT thermal switch hybrid
8.7 GDT backup air gap hybrid
8.8 Cascaded protection
8.9 Series connected GDTs for d.c. power applications
Appendix I – Durability test using "Fast" GDTs
I.1 Testing
Appendix II – Spark-over dark effect
II.1 Testing
Appendix III – GDT component form factors
III.1 Introduction
III.2 Outlines of GDTs with different form factors
III.3 Outline of GDTs with coaxial form factors
III.4 Outlines of GDTs with reduced axial length and two-electrodes
III.5 Outlines of GDTs with reduced axial length and three-electrodes
III.6 General
Appendix IV – Three-electrode GDT operation in Ethernet circuits
IV.1 Introduction
IV.2 Three-electrode GDT applied to Ethernet twisted pair
IV.3 Three-electrode GDT applied to Ethernet powering pair
Bibliography