Table of Contents

 1     Scope            
 2     References   
 3     Definitions   
        3.1     Terms defined elsewhere
        3.2     Terms defined in this Recommendation     
 4     Abbreviations and acronyms  
 5     Reference configuration           
 6     General requirements
        6.1     Impulse withstand voltage levels  
        6.2     Surge protective devices (SPDs)    
        6.3     Earthing and bonding     
 7     Indirect lightning performance of a telecommunication line            
        7.1     Number of damages and risk assessment   
        7.2     Tolerable risk    
 8     Node exposure to lightning-induced surges           
        8.1     Unshielded nodes             
        8.2     Shielded nodes 
        8.3     Effect of surge protective devices
Annex A – Environmental factor and installation factor    
Annex B – Refraction factor    
Annex C – Shielding factor    
Appendix I – Shield resistance of cables with metallic symmetric conductors    
Appendix II – Algorithm for computer code    
Appendix III – Collection area for flashes near a telecommunication line    
Appendix IV – Examples of calculation    
       IV.1     Italian survey  
       IV.2     Japanese survey             
       IV.3     German survey               
       IV.4     American survey            
       IV.5     Final remarks  
Bibliography