EN IEC 62561-3:2023 is the CLC-adopted European version of IEC 62561-3:2023, Part 3 of the Lightning Protection System Components (LPSC) series. This third edition is a technical revision of the 2017 edition and is published as an RLV (Redline version) showing changes from the previous edition. The standard specifies requirements and type tests for isolating spark gaps (ISGs) used in lightning protection systems where direct bonding of nearby metalwork is not permissible for functional reasons.
Key topics and technical requirements
The standard defines classification, performance requirements and test procedures for ISGs, including:
- Classification by lightning current capability and intended installation location.
- Environmental requirements covering outdoor/indoor use, UV exposure and corrosion resistance.
- Electrical requirements such as isolation resistance, rated impulse sparkover voltage, rated DC and power-frequency withstand voltages, and lightning current carrying capability.
- Mechanical requirements including impact (hammer) tests and marking durability.
- Documentation and installation instructions that manufacturers must supply.
- Electromagnetic compatibility (EMC) considerations and detailed structure/content requirements for test reports.
- Normative test methods: ultraviolet (UV) exposure tests, salt mist and humid sulphurous atmosphere (aligned with the latest ISO 22479), ammonia tests, lightning impulse current tests and acceptance criteria.
- Annexes: Flowchart for test sequencing, corrosion resistance procedures, UV test alternatives and a new Annex D clarifying applicability of previous tests for products compliant with the 2017 edition.
Practical applications and users
EN IEC 62561-3:2023 is intended for:
- Manufacturers and designers of isolating spark gaps and lightning protection components (LPSC).
- Test laboratories performing type testing and conformity assessment for ISGs.
- Specifying engineers and consultants responsible for lightning protection of buildings, industrial installations, telecom and utility structures where indirect bonding is required.
- Regulatory bodies and certification organizations assessing compliance with European and international lightning protection practices.
Using this standard helps ensure ISGs provide reliable isolation, predictable sparkover behavior under lightning stress, and durable performance in harsh environments.
Related standards
EN IEC 62561-3 references other LPSC and environmental standards such as:
- EN IEC 62561-1 (connection components)
- IEC/EN 60068 series (environmental testing)
- ISO 22479 (humid sulphurous atmosphere)
- IEC 62305 (protection against lightning)
Keywords: EN IEC 62561-3:2023, isolating spark gaps, ISG, lightning protection, LPSC, ISG requirements, isolation resistance, rated impulse sparkover voltage, corrosion resistance, UV test.