IEC TR 61000-3-4-1998 PDF

Full title and description

IEC Technical Specification 61000-3-4:1998 — Electromagnetic compatibility (EMC) - Part 3-4: Limits - Limitation of emission of harmonic currents in low-voltage power supply systems for equipment with rated current greater than 16 A. The document provides recommendations to enable supply authorities and manufacturers to assess harmonic current emissions from equipment with a rated input current exceeding 16 A per phase and to judge acceptability for connection to public low-voltage AC distribution systems.

Abstract

This Technical Specification gives recommended information and assessment criteria for harmonic current emissions produced by electrical and electronic equipment with rated input currents above 16 A per phase. It covers connection types (single-phase up to 240 V and three-phase up to 600 V) and nominal frequencies of 50 Hz or 60 Hz, and is intended as guidance for supply authorities rather than as a full International Standard.

General information

• Status: Published — Technical Specification (TS).
• Publication date: 1998-10-30.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 33.100.10 (Emission).
• Edition / version: Edition 1.0 (1998).
• Number of pages: 29.

Key bibliographic and status details above are those recorded on the IEC publication entry.

Scope

The Technical Specification applies to electrical and electronic equipment with a rated input current exceeding 16 A per phase that is intended to be connected to public low-voltage AC distribution systems (single-phase systems up to 240 V and three-phase systems up to 600 V) at nominal frequencies of 50 Hz or 60 Hz. It specifies the information required by a supply authority to assess equipment for harmonic disturbance and to decide whether the equipment is acceptable for connection with respect to harmonic distortion. This TS is guidance and is not itself an International Standard.

Key topics and requirements

• Definition of the equipment scope: rated input current greater than 16 A per phase.
• Types of public low-voltage systems covered (single- and three-phase, voltage ranges and frequencies).
• Recommended data and declarations manufacturers should supply for harmonic assessment (e.g., harmonic current spectra, operating duty, connection mode).
• Assessment principles for supply authorities to judge acceptability regarding harmonic distortion.
• Guidance (not mandatory limits) on how to evaluate harmonic emission impact on networks and mating equipment.
• Relationship to other EMC limits and measurement practices for harmonic currents.

Typical use and users

Primary users are manufacturers of industrial and large electrical equipment (>16 A per phase), power utilities and supply authorities, EMC consultants, test laboratories and regulatory bodies involved in network connection rules and power quality assessment. The document is used to inform connection agreements, pre-connection assessments and technical specifications for large-load equipment.

Related standards

Part of the IEC 61000 series addressing limits and compatibility for power systems (notably the 61000-3 family). Related and complementary documents include IEC 61000-3-2 (limits for equipment ≤16 A), IEC 61000-3-3 (voltage changes, flicker), IEC 61000-3-11 / -3-12 (other large-load guidance), and various IEC 61000-4-series test methods. National adoptions / national publications (for example BS IEC 61000-3-4) and subsequent IEC work on harmonic limits and assessment practices are commonly referenced alongside this TS.

Keywords

EMC; harmonic currents; harmonic emission; low-voltage distribution; power quality; supply authority; rated current >16 A; IEC 61000-3-4; Technical Specification; connection assessment.

FAQ

Q: What is this standard?

A: It is IEC Technical Specification 61000-3-4:1998 that provides recommendations for limitation and assessment of harmonic current emissions from equipment with rated input currents greater than 16 A per phase intended for public low-voltage AC networks.

Q: What does it cover?

A: It covers the information manufacturers should provide and the assessment principles a supply authority can use to judge whether equipment will cause unacceptable harmonic distortion on public low-voltage systems (single- and three-phase, specified voltage ranges and 50/60 Hz operation).

Q: Who typically uses it?

A: Manufacturers of large electrical equipment, utilities and supply authorities, EMC consultants, test houses and regulators involved in connection approval and power-quality management.

Q: Is it current or superseded?

A: The document was published on 30 October 1998 as a Technical Specification. IEC records show the publication and a declared stability period; users should check the IEC catalogue or their national standards body for any more recent amendments, replacements or national adoptions before relying on the text for regulatory decisions.

Q: Is it part of a series?

A: Yes — it is part of the IEC 61000 (EMC) family, specifically the 61000-3 subgroup that addresses limits for emissions and power-quality phenomena (harmonics, flicker, large loads, etc.).

Q: What are the key keywords?

A: EMC; harmonic currents; harmonic emission limits; low-voltage power supply systems; rated current >16 A; power quality; supply authority assessment; IEC 61000-3-4.