Overview
IEC 62305-1:2010 - Protection against lightning, Part 1: General principles defines the general principles for protecting structures, their installations and contents, and people from lightning. This second edition (2010) is a technical revision of the 2006 edition and introduces several important updates: it no longer covers protection of services connected to structures, it adds isolated interfaces as protection measures for electrical/electronic systems, it introduces the first negative impulse current as a lightning parameter for calculations, and it refines expected surge overcurrents for low-voltage power and telecommunication systems.
Keywords: IEC 62305-1, protection against lightning, lightning protection standards, lightning protection systems.
Key topics and technical requirements
- Scope & principles: Establishes foundational concepts and terminology used across the IEC 62305 series (threat, risk, protection measures).
- Lightning current parameters: Defines parameters used for design and testing (including the newly introduced first negative impulse current) and supplies statistical values and probability tables.
- Damage and types of loss: Categorizes effects of lightning on structures, installations and people; links effects to appropriate protection responses.
- Risk and economic justification: Points to risk assessment methodology (see IEC 62305-2) to determine need and cost-effectiveness of protection measures.
- Protection measures overview: Describes classes of measures to reduce:
- physical damage and life hazard (further detailed in IEC 62305-3),
- failures of electrical and electronic systems (further detailed in IEC 62305-4), including isolated interfaces and surge protection.
- Basic design criteria: Introduces Lightning Protection Levels (LPL), Lightning Protection Zones (LPZ) and criteria for selecting measures.
- Informative annexes: Provide reference data and methods for lightning parameters, time functions, simulation and test parameters, and expected surge overcurrents for different installation points.
Keywords: lightning current parameters, LPL, LPZ, surge overcurrents, isolated interfaces.
Practical applications - who uses this standard
- Design and electrical engineers developing lightning protection systems (LPS) and surge protective measures (SPM).
- Architects and safety managers assessing building resilience to lightning.
- Telecommunications and power distribution engineers designing low-voltage and telecom protection.
- Test laboratories and manufacturers of LPS/SPM components for compliance and test planning.
- Regulators and certification bodies referencing harmonized international requirements.
Keywords: lightning protection systems, surge protection, low-voltage protection, telecommunication protection.
Related standards
- IEC 62305-2 - Risk management for lightning protection.
- IEC 62305-3 - Physical damage to structures and life hazard protection (LPS).
- IEC 62305-4 - Protection of electrical and electronic systems within structures (SPM).
Using IEC 62305-1 ensures consistent terminology, selection criteria and reference data across the IEC 62305 series for effective, economically justified lightning protection design and implementation.
