BS EN 61663-2:2001

FOREWORD
INTRODUCTION
Clause
1 Scope and object
2 Normative references
3 Definitions
4 Reference configuration
5 Environmental factor Ke, installation factor Ki,
  shielding factor Ks and conventional transition
  point length LcT
  5.1 Environmental factor Ke
  5.2 Installation factor Ki
  5.3 Shielding factor Ks
  5.4 Conventional transition point length LcT
6 Protection need
  6.1 General
  6.2 Protection need against indirect lightning to
      the telecommunication line
  6.3 Protection need against direct lightning to the
      structure that the telecommunication line enters
  6.4 Protection need against direct lightning to the
      telecommunication line
7 Protection measures
  7.1 General
  7.2 Protective measures against indirect lightning
      to the telecommunication line
  7.3 Protective measures against direct lightning to
      the structure that the telecommunication line enters
  7.4 Protective measures against direct lightning to
      the telecommunication lines
Annex A (normative) Procedure for evaluating the
        protection needs against lightning of
        telecommunication or signal lines using
        metallic conductors
Annex B (normative) Resistance value of the cable shield
        connection to earth along the telecommunication
        line
Annex C (normative) Evaluation of the lightning current
        I striking the structure which causes damage
        to the telecommunication line entering the structure
Annex D (informative) Overvoltages, overcurrents and
        frequency of damage Fp on a telecommunication line
Annex E (informative) Relative amount of expected
        losses per damage
Annex F (informative) Application of protection need
        requirements: examples
Annex G (informative) Environmental factor Ke
Annex H (informative) Risk of damage Rp
Annex ZA (normative) Normative references to international
         publications with their corresponding European
         publications

Pertains to protection against lightning of outdoor telecommunication lines using metallic conductors (for example, access networks, lines between buildings). It aims to protect telecommunication lines and connected equipment against the direct and indirect influence of lightning by limiting the risk of damage due to overvoltages and overcurrents, liable to occur in these lines, to values which are lower than or equal to the tolerable risk of damage.

Deals with protection against lightning of outdoor telecommunication lines using metallic conductors (for example, access networks, lines between buildings). These lines concern: - telecommunication lines connecting a switch with a network termination (NT1) - telecommunication or signal lines connecting equipment located in different buildings, e.g. ISDN lines or signal lines between computers. The object of this standard is to protect telecommunication lines and connected equipment against the direct and indirect influence of lightning by limiting the risk of damage due to overvoltages and overcurrents, liable to occur in these lines, to values which are lower than or equal to tolerable risk of damage. The type of building can also have an effect on the risk assessment of lightning damage to telecommunication lines, as well as the physical layout of the equipment installation. However, these and other similar aspects are covered by appropriate, specific standards and are beyond the scope of this standard. Fibre optical cable with metallic pairs in the cable core must be protected, following the requirements of this standard, together with those requirements defined in IEC 61663-1.