Summary

Recommendation ITU-T K.40 proposes guidelines for the design of an effective protective system for a telecommunication structure against lightning electromagnetic pulse (LEMP). The concept of lightning protection zones is introduced as a framework where specific protective measures are merged: earthing, bonding, cable routing, shielding, coordinated SPD system and isolating interfaces. Information about simulating the LEMP effects and a shopping list for the protective measures in existing and new buildings are also given.