IEC 61000-4-29:2026

Overview

IEC 61000-4-29:2026, published by the International Electrotechnical Commission (IEC), addresses electromagnetic compatibility (EMC) by providing standardized testing and measurement techniques for voltage dips, short interruptions, and voltage variations at DC input power ports of electrical and electronic equipment. This standard is relevant for equipment and systems with DC input power ports intended for connection to low voltage DC networks external to the equipment. Its primary objective is to ensure a reproducible, internationally recognized approach for evaluating immunity when such equipment is subjected to voltage disturbances on DC input power ports.

Key Topics

• Test Levels: Specifies preferred test levels and durations for voltage dips, short interruptions, and voltage variations, facilitating uniform testing across various equipment.
• Test Generator Requirements: Details specifications for test generators, including voltage range, output impedance, and inrush current capabilities for both low and high impedance conditions.
• Test Procedures: Describes a step-by-step process, including test set-up, laboratory reference conditions, and execution for simulating voltage disturbances.
• Evaluation of Results: Guides classification and reporting of immunity test results based on observed loss or degradation of equipment performance.
• Technical Revisions (2026 Edition):
  • Enhanced test generator voltage output ranges to accommodate new DC network voltages.
  • Defined tolerances for duration of voltage changes.
  • Current limitation provisions for short interruptions in low impedance conditions.
  • Improved technical clarifications for generator specifications and verification.
  • Clarified procedures for evaluating switching characteristics, loads, and inrush currents.
  • Expanded descriptions of the low-voltage DC environment.

Applications

IEC 61000-4-29 is widely applicable in sectors that rely on the stable operation of DC-powered equipment, including:

• Industrial Automation: Ensures programmable logic controllers (PLCs), drives, and industrial computers can withstand DC network disturbances.
• Telecommunications: Validates immunity of telecom power systems that frequently operate with low voltage DC inputs.
• Renewable Energy Systems: Assesses the resilience of solar inverters and battery storage modules interfacing with DC grids.
• Transportation: Applies to DC-powered systems such as rail vehicle equipment, where reliable operation under voltage variations is critical.
• Data Centers: Relevant for backup power systems and IT equipment designed to operate on DC supply.

Product committees, equipment manufacturers, and users refer to this standard as a general testing framework. The specific test levels and severity are selected based on application and equipment type to ensure relevant, meaningful EMC immunity assessments.

Related Standards

When considering EMC testing for DC power systems, the following related international standards provide complementary guidance:

• IEC 61000-4-17: Focuses on immunity tests related to ripple at DC input power ports, which is outside the scope of 61000-4-29.
• IEC 61000 Series: Covers a comprehensive range of EMC testing, measurement techniques, limits, and guidelines, providing an integrated approach to EMC compliance.
• IEC 61000-4-11: Addresses voltage dips, short interruptions, and voltage variations for equipment with AC input power ports.
• Product-Specific EMC Standards: Equipment-specific test requirements, chosen by relevant IEC product committees, may reference IEC 61000-4-29 as a basis for immunity testing.

By adhering to IEC 61000-4-29:2026, manufacturers and conformity assessment bodies can demonstrate consistent EMC performance of equipment under real-world DC power disturbance scenarios, supporting global market access and operational reliability.