The IEC 62305-3 standard, titled "Physical damage to structures and life hazard," provides the primary technical requirements for designing and installing a Lightning Protection System (LPS). It covers both external protection (interception, down-conductors, and earthing) and internal protection (equipotential bonding to prevent sparking).

• Visual Inspection: Must be performed periodically (usually annually) to check for corrosion, loose connections, or physical damage to conductors.
• Complete Inspection: Required every 2–4 years (depending on national adoption), involving continuity testing, earth resistance measurement, and checking SPD functionality.
• Records: Detailed reports must be kept to verify the system still meets the original design parameters.

While other parts of the series handle general principles or electronic surges, Part 3 is "where the rubber meets the road" for physical construction. It provides the framework for building a system that can safely intercept a lightning strike and conduct it to the ground. 1. Core Components of an External LPS

LPL I: The highest level of protection, designed to handle lightning currents up to 200 kA.

Recent developments and relevance (practical note) IEC 62305 remains broadly referenced worldwide. Users should consult the latest edition and related parts (Parts 1–4) for updated lightning parameters, risk matrices, and harmonized practices. Because the standard’s risk methodology ties into national tolerable risk criteria and insurance practice, staying current with local adoption and normative references is essential.

Internal LPS: Measures taken to prevent dangerous sparking within the structure, primarily through equipotential bonding (connecting metal parts) and maintaining separation distances between the LPS and other conductive elements. 3. Lightning Protection Levels (LPL)