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While Part 1 covers general principles and Part 2 focuses on risk management, Part 3 provides the actual engineering blueprints for physical protection. Scope of the Standard

: Requirements for equipotential bonding to reduce the risk of fire and electric shock inside a structure.

This is where lightning current dissipates into the ground. IEC 62305-3 specifies:

Previously found in an annex, the standard now offers two clarified methods (general and simplified) for calculating the separation distance—the required gap between the LPS and other conductive elements to prevent dangerous sparking.

IEC 62305-3 PDF: Comprehensive Guide to Structural Lightning Protection (2026 Updated)

Protecting human beings from injury due to touch and step voltages in the immediate vicinity of an LPS. Key Components of a Lightning Protection System (LPS)