CONTENTS

 1     Scope
 2     References
 3     Definitions
 4     Reference configuration
 5     Expected risk of damages
        5.1     General
        5.2     Frequency of damages for cables
        5.3     Frequency of damages for structures that the cable enters
        5.4     Parameters for the evaluation of the frequency of damages
                  5.4.1     Lightning ground flash density (N_g)
                  5.4.2     Current probability factor (p(i))
                  5.4.3     Environmental factor (K_e)
                  5.4.4     Striking distance (D)
                  5.4.5     Damage correction factor (K_d)
 6     Determination of failure current (I_a)
        6.1     Lightning discharges to cables
        6.2     Lightning discharges to structures where the cable enters
 7     Protection procedures
        7.1     Selection of the environment
        7.2     Choice of the cable
                  7.2.1     Dielectric optical fibre cable
                  7.2.2     Cable with high sheath breakdown current
                  7.2.3     Cable with high sheath breakdown voltage
        7.3     Buried or aerial installation
        7.4     Use of surge protective devices (SPD)
        7.5     Shielding
        7.6     Route redundancy
Annex A-Evaluation of the sheath breakdown current
        A.1     Buried cable
        A.2     Aerial cable
Appendix I - Tests for the evaluation of surge resistibility of cables
        I.1     Breakdown voltage (U_b)
        I.2     Test current (I_t) for buried cable
        I.3     Test current (I_t) for aerial cable
Appendix II - Expected loss per damage (d)