IEC 61000-5-6:2024

Overview

IEC 61000-5-6:2024 - Electromagnetic compatibility (EMC) - Part 5-6: Installation and mitigation guidelines - Mitigation of external EM influences is an international IEC standard that provides guidance on protecting facilities and installations from external electromagnetic threats. It covers mitigation of lightning, RF transmitters, power-line and telecom transients, high-altitude electromagnetic pulse (HEMP) and high-power electromagnetic environments (HPEM) including intentional electromagnetic interference (IEMI). This 2024 edition replaces IEC TR 61000-5-6 (2002) and adds modern HPEM/IEMI considerations and a new Annex A on EM resilience, detection and recovery.

Key topics and technical requirements

• Scope and application: Guidance primarily for new installations; applicable to economically feasible extensions or modifications of existing sites. Not intended for single equipment EMC qualification.
• Shielding and protection zones: Design principles for building, room, equipment and apparatus shields; maintaining shielding effectiveness and managing apertures and penetrations.
• Filters and insertion loss: Selection, installation and testing of AC/DC and signal-line filters, including attenuation, insertion loss and HF transient performance.
• Decoupling devices: Use of isolation transformers, motor-generator sets, UPS and optical links for isolation and immunity.
• Surge-protective devices (SPDs): Principles for direct equipment protection, coordinated SPD cascades and typical SPD technologies (voltage-limiting and switching types).
• Topology and interfaces: Barrier topology, ports and interfaces at enclosure boundaries to control conducted and radiated coupling.
• Resilience-based approach (Annex A): EM resilience model - Identify, Protect, Detect, Respond, Recover - and guidance on detectors, recovery strategies and restoration planning for HPEM/IEMI events.
• Testing and verification: Installation-level checks for shielding, filter insertion loss and SPD performance (general guidance; consult product standards for component tests).

Practical applications and who uses this standard

IEC 61000-5-6:2024 is intended for:

• Installers and system integrators designing shielded rooms, secure facilities, or critical infrastructure sites.
• Manufacturers of enclosures, filtering systems, SPDs and site mitigation products.
• Facility owners/operators of data centers, hospitals, control rooms, telecommunications hubs and other sensitive installations requiring EMC resilience against external EM threats. Practical uses include site design, retrofit planning, procurement specifications, and risk assessments for HEMP/IEMI and transient events.

Related standards

• Other parts of the IEC 61000 series (EMC testing and measurement methods, immunity and emission standards).
• Component and product standards for filters, SPDs, transformers and EMC testing - consult relevant IEC product standards for specific test methods and numerical limits.

Keywords: IEC 61000-5-6:2024, EMC, mitigation of external EM influences, HEMP, IEMI, shielding, filters, surge-protective devices, EM resilience, HPEM.