1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Factors influencing surge levels
6.1 Surge coupling and mechanisms of damage
6.2 Elements
of protection
6.3 Equipment resistibility
6.4 Correct classification and use of ports
6.5 Cable routing
6.6 Earthing and bonding
6.7 SPDs
6.8 Direct strike protection of a structure
6.9 Installation of protection
6.10 Conclusions
Annex A – Simulations
A.1 Introduction
A.2 Stress applied to the equipment via the mains port
A.3 Stress applied to the equipment via the telecommunication port
A.4 Waveform after primary protection and coordination
Appendix I – Calculation of cable current in a telecommunication line versus
distance from the strike point
I.1 Introduction
I.2 Resistance to earth at the strike
point
I.3 Equivalent circuit of a strike to earth
I.4 Simulation results for a 30 pair 0.64
mm MB cable with a zero ohm resistance to earth at the customer end
I.5 Simulation results for a 30 pair 0.4
mm non-shielded cable
I.6 Conclusions drawn from the
simulations
I.7 Calculation of cable current
I.8 Determination of the cable surge
generator.
Appendix II – Impact of local environment
Bibliography