IEC 62561-4:2023

Overview

IEC 62561-4:2023 - "Lightning protection system components (LPSC) - Part 4: Requirements for conductor fasteners" specifies requirements and test methods for metallic and non‑metallic conductor fasteners used to retain and support the air‑termination, down‑conductor and earth‑termination systems of a lightning protection system (LPS). The third edition (2023) replaces the 2017 edition and introduces technical revisions including alignment with updated environmental test standards and a new normative annex on applicability of previous tests.

Keywords: IEC 62561-4, conductor fasteners, lightning protection, LPSC, LPS, IEC 62561

Key topics and technical requirements

• Scope and classification
  • Applies to metallic, non‑metallic and composite conductor fasteners used within LPS; does not cover fixing fasteners to building fabric.
• Environmental requirements
  • Corrosion resistance testing (salt mist, humid sulphurous and ammonia atmosphere considerations).
  • Ultraviolet (UV) resistance tests for non‑metallic and composite materials.
  • Alignment with ISO/IEC environmental treatment standards (e.g., ISO/IEC 60068‑2‑52 and ISO 22479).
• Mechanical strength
  • Tests for perpendicular (lateral) and axial loads, and impact resistance to verify retention and support under mechanical stresses.
• Installation and marking
  • Requirements for installation instructions, durable marking (content, durability and legibility) and acceptance criteria after testing.
• Electromagnetic compatibility (EMC)
  • Considerations for EMC where relevant to conductor fastener design and testing.
• Test methods and reporting
  • Detailed specimen preparation, test procedures, acceptance criteria and structure/content of the test report (including test conditions, equipment and recorded results).
• Normative annex
  • New annex explaining applicability of previous tests for products compliant with earlier editions.

Practical applications and who uses this standard

IEC 62561-4 is essential for:

• Manufacturers of conductor fasteners seeking product design, testing and compliance guidance.
• Testing laboratories and certification bodies performing environmental and mechanical qualification.
• Specifiers, consultants and lightning protection designers selecting suitable fasteners for installations (air‑termination, down‑conductor, earth‑termination).
• Installers and maintenance teams requiring installation instructions and product marking guidance.
• Engineers working in corrosive or UV‑exposed environments (marine, industrial, sulphurous atmospheres) who must select fasteners with proven resistance.

Related standards

• IEC 62561 series (other LPSC parts)
• IEC 62305 (design and implementation of LPS)
• ISO/IEC 60068‑2‑52 (salt mist atmosphere treatment)
• ISO 22479 (humid sulphurous atmosphere treatment)

This standard helps ensure conductor fasteners are durable, mechanically reliable and suitably tested for diverse environmental conditions - supporting safer, code‑compliant lightning protection installations.