1
Scope
2 References
3 Definitions
4 Reference configuration
5 Expected risk of damage
5.1 General
5.2 Frequency of damage to
cables
5.3 Frequency of damage to
structures that the cable enters
5.4 Parameters for the
evaluation of the frequency of damage
6 Determination of failure
current (Ia)
6.1 Lightning discharges
to cables
6.2 Lightning discharges
to structures where the cable enters
7 Protection procedures
7.1 General principle
7.2 Protective measures
against flashes to lines
7.3 Choice of the cable
7.4 Buried or aerial
installation
7.5 Use of surge
protective devices (SPDs)
7.6 Shielding wire and
lightning protective cable or metal conduit
7.7 Route redundancy
Annex A – Evaluation of the sheath breakdown current
A.1 Buried cable
A.2 Aerial cable
A.3 Buried or aerial cable
with SPDs between conductors and the shield for direct flashes to the structure
where the cable is entering
Appendix I – Tests for the evaluation of surge resistibility
of cables
I.1 Breakdown voltage
(Ub)
I.2 Test current (It)
for buried cable
I.3 Test current (It)
for aerial cable
Appendix II – Expected loss per damage (L)
Appendix III – Examples of application
III.1 Telecommunication line
with shielded and unshielded sections in suburban environment
III.2 Telecommunication line
with only shielded sections in suburban environment
III.3 Telecommunication line
with shielded and unshielded sections in rural environment
Bibliography