SIST EN IEC 61000-2-4:2024

SLOVENSKI STANDARD
01-november-2024
Elektromagnetna združljivost (EMC) - 2-4. del: Okolje - Ravni združljivosti za
nizkofrekvenčne prevajane motnje v elektroenergetskih omrežjih industrijskih
objektov
Electromagnetic compatibility (EMC) - Part 2-4: Environment - Compatibility levels in
power distribution systems in industrial locations for low-frequency conducted
disturbances
Elektromagnetische Verträglichkeit (EMV) - Teil 2-4: Umgebungsbedingungen -
Verträglichkeitspegel für niederfrequente leitungsgeführte Störgrößen in Industrieanlagen
Compatibilité électromagnétique (CEM) - Partie 2-4: Environnement - Niveaux de
compatibilité dans les installations industrielles pour les perturbations conduites à basse
fréquence
Ta slovenski standard je istoveten z: EN IEC 61000-2-4:2024
ICS:
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61000-2-4

NORME EUROPÉENNE
EUROPÄISCHE NORM September 2024
ICS 33.100.10; 33.100.20 Supersedes EN 61000-2-4:2002;
EN 61000-2-4:2002/AC:2014
English Version
Electromagnetic compatibility (EMC) - Part 2-4: Environment -
Compatibility levels in power distribution systems in industrial
locations for low-frequency conducted disturbances
(IEC 61000-2-4:2024)
Compatibilité électromagnétique (CEM) - Partie 2-4: Elektromagnetische Verträglichkeit (EMV) - Teil 2-4:
Environnement - Niveaux de compatibilité dans les réseaux Umgebungsbedingungen - Verträglichkeitspegel für
de distribution d'électricité sur des sites industriels pour les niederfrequente leitungsgeführte Störgrößen in
perturbations conduites à basse fréquence Industrieanlagen
(IEC 61000-2-4:2024) (IEC 61000-2-4:2024)
This European Standard was approved by CENELEC on 2024-08-29. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61000-2-4:2024 E

European foreword
The text of document 77A/1215/FDIS, future edition 3 of IEC 61000-2-4, prepared by SC 77A "EMC -
Low frequency phenomena" of IEC/TC 77 "Electromagnetic compatibility" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 61000-2-4:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-05-29
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-08-29
document have to be withdrawn
This document supersedes EN 61000-2-4:2002 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61000-2-4:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60038:2009 NOTE Approved as EN 60038:2011
IEC 61000-1-2 NOTE Approved as EN 61000-1-2
IEC 61000-4-15:2010 NOTE Approved as EN 61000-4-15:2011 (not modified)
IEC 61511-1:2016 NOTE Approved as EN 61511-1:2017 (not modified)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 61000-2-2 2002 Electromagnetic compatibility (EMC) - Part EN 61000-2-2 2002
2-2: Environment - Compatibility levels for
low-frequency conducted disturbances and
signalling in public low-voltage power
supply systems
+ A1 2017 + A1 2017
+ A2 2018 + A2 2019
IEC 61000-2-12 - Electromagnetic compatibility (EMC) - Part EN 61000-2-12 -
2-12: Environment - Compatibility levels for
low-frequency conducted disturbances and
signalling in public medium-voltage power
supply systems
IEC 61000-4-7 - Electromagnetic compatibility (EMC) - Part EN 61000-4-7 -
4-7: Testing and measurement techniques
- General guide on harmonics and
interharmonics measurements and
instrumentation, for power supply systems
and equipment connected thereto
CISPR 16-1-1 - Specification for radio disturbance and EN IEC 55016-1-1 -
immunity measuring apparatus and
methods - Part 1-1: Radio disturbance and
immunity measuring apparatus -
Measuring apparatus
CISPR 16-2-1 - Specification for radio disturbance and EN 55016-2-1 -
immunity measuring apparatus and
methods - Part 2-1: Methods of
measurement of disturbances and
immunity - Conducted disturbance
measurements
IEC 61000-2-4 ®
Edition 3.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electromagnetic compatibility (EMC) –

Part 2-4: Environment – Compatibility levels in power distribution systems in

industrial locations for low-frequency conducted disturbances

Compatibilité électromagnétique (CEM) –

Partie 2-4: Environnement – Niveaux de compatibilité dans les réseaux de

distribution d'électricité sur des sites industriels pour les perturbations

conduites à basse fréquence
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10; 33.100.20 ISBN 978-2-8322-9416-1

– 2 – IEC 61000-2-4:2024  IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 General definitions . 9
3.2 Phenomena-related definitions . 11
3.3 Abbreviated terms . 15
4 Electromagnetic environment classes . 15
5 Introduction to the setting of compatibility levels for different types of
electromagnetic disturbances . 17
5.1 General comment. 17
5.2 Voltage deviations . 17
5.3 Voltage dips and short interruptions . 17
5.4 Voltage imbalance . 18
5.5 Temporary power-frequency variation . 18
5.6 Harmonics . 18
5.7 Interharmonics . 19
th
5.8 Voltage components at higher frequencies (above 40 harmonic) . 19
5.9 Transient overvoltages . 20
5.10 DC component . 20
6 Compatibility levels . 20
Annex A (informative) Explanations and examples for interharmonics . 24
A.1 Resolution of non-sinusoidal voltages and currents . 24
A.2 Time varying phenomena . 25
Annex B (informative) Examples of expected disturbance levels in typical industrial
networks . 26
B.1 General . 26
B.2 Voltage disturbance levels in industrial networks due to large converters . 26
B.3 Voltage disturbance levels in industrial networks at high load . 28
B.4 Voltage dips and short interruptions . 30
B.4.1 Description . 30
B.4.2 Adaptation . 31
B.5 Transient overvoltages . 31
Annex C (informative) Interharmonics and voltages at higher frequencies and
mitigation methods . 33
C.1 Sources of interharmonics . 33
C.1.1 Identification . 33
C.1.2 Different types of sources of interharmonics . 33
C.1.3 Effects of interharmonics and compatibility . 35
C.1.4 Guidance levels . 35
C.2 Mitigation methods . 37
C.2.1 General . 37
C.2.2 Decrease emission levels . 37
C.2.3 Increase immunity . 38
C.2.4 Protection of mains signaling . 38

IEC 61000-2-4:2024  IEC 2024 – 3 –
Annex D (informative) Proving compatibility in the frequency range above 2 kHz in
industrial MV networks . 39
Annex E (informative) Examples of locations and installations covered by

IEC 61000-2-4 . 40
E.1 General . 40
E.2 Mixed locations . 40
E.3 Examples for industrial locations . 40
Annex F (informative) Rationale for increased individual even and triplen compatibility
levels and for splitting class 2 into class 2a, class 2b and class 2L . 44
F.1 Rationale for increased individual even and triplen compatibility levels . 44
F.1.1 Target . 44
F.1.2 The needs of modern power electronic equipment . 44
F.1.3 Maintaining the overall disturbance level . 45
F.2 Rationale for splitting class 2 into class 2a, class 2b and class 2L . 45
F.2.1 Target . 45
F.2.2 Class 2a . 45
F.2.3 Class 2b . 45
F.2.4 Class 2L . 46
Bibliography . 47

Figure 1 – Examples of the application of different electromagnetic environment
classes in different industrial locations . 16
Figure 2 – Example of different parts of an installation separated by filters, where

different electromagnetic environment classes are applied . 16
Figure 3 – Interharmonic compatibility levels (flickermeter response for P = 1 related
st
to 60 W incandescent lamps) . 23
Figure B.1 – Example of power distribution in industry with rolling mills . 27
Figure B.2 – Example of power distribution in the paper industry . 28
Figure B.3 – Example of power distribution in a generic manufacturing industry . 30
Figure B.4 – ITI (CBEMA) – Curve of tolerance envelope of ITE . 32
Figure E.1 – Example of class 1 environment . 40
Figure E.2 – Example of class 2a and class 2b environments . 41
Figure E.3 – Example of an LV grid in a building supplied by a dedicated transformer . 41
Figure E.4 – Example of an LV grid in a building including residential and industrial
locations . 42
Figure E.5 – Example of an LV grid for a data center . 42
Figure F.1 – Emission spectrum of an active infeed converter . 44

Table 1 – Compatibility levels for voltage tolerance, voltage imbalance and power-

frequency variations . 20
Table 2 – Compatibility levels for harmonics – Harmonic voltage components. 21
Table 3 – Compatibility levels for total voltage harmonic distortion . 22
Table 4 – Compatibility levels for low voltage networks in the frequency range from
2 kHz to 9 kHz . 22
Table 5 – Compatibility levels for low voltage networks in the frequency range from
9 kHz to 150 kHz . 22
Table B.1 – Type of network . 26

– 4 – IEC 61000-2-4:2024  IEC 2024
Table B.2 – Voltage disturbance levels in a typical manufacturing industry . 29
Table C.1 – Indicative values for interharmonic voltages in low-voltage networks with
respect to the flicker effect . 36

IEC 61000-2-4:2024  IEC 2024 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 2-4: Environment –
Compatibility levels in power distribution systems
in industrial locations for low-frequency conducted disturbances

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61000-2-4 has been prepared by subcommittee 77A: EMC – Low frequency phenomena,
of IEC technical committee 77: Electromagnetic compatibility. It is an International Standard.
This third edition cancels and replaces the second edition published in 2002. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) introduction of new classes 2a, 2b and 2L (former class 2);
b) modification of existing compatibility levels for class 3;
c) addition of compatibility levels in the frequency range 2 kHz to 150 kHz;

– 6 – IEC 61000-2-4:2024  IEC 2024
d) addition of compatibility levels using a new quantity: partial weighted harmonic distortion
(PWHD).
The text of this International Standard is based on the following documents:
Draft Report on voting
77A/1215/FDIS 77A/1221/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 61000 series, published under the general title Electromagnetic
compatibility (EMC), can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

IEC 61000-2-4:2024  IEC 2024 – 7 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts, published either as International Standards,
technical specifications or technical reports, some of which have already been published as
sections. Others will be published with the part number followed by a dash and a second number
identifying the subdivision (example: IEC 61000-3-11).
Detailed information on the various types of disturbances that can be expected on public power
supply systems can be found in IEC 61000-2-1 and IEC 61000-2-12.

– 8 – IEC 61000-2-4:2024  IEC 2024
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 2-4: Environment –
Compatibility levels in power distribution systems
in industrial locations for low-frequency conducted disturbances

1 Scope
This part of IEC 61000 is related to conducted disturbances in the frequency range from 0 kHz
to 150 kHz. It gives compatibility levels in differential mode (L-L and L-N) for industrial locations,
with a nominal voltage up to 35 kV and a nominal frequency of 50 Hz or 60 Hz.
NOTE 1 Industrial locations are defined in 3.1.8.
Power distribution systems on ships, aircraft, offshore platforms and railways are not included.
NOTE 2 See also Annex E. The compatibility levels specified in this document apply at the in-plant point of coupling
(IPC). The level of the low-frequency disturbances at the terminals of equipment receiving its supply from the IPC is
generally assumed to be similar to the disturbance level at the IPC itself. However, in some situations this is not the
case, particularly when a long feeder is dedicated to the supply of a particular load, or when a disturbance is
generated or amplified within the installation of which the equipment forms a part.
Compatibility levels are specified for the types of low-frequency electromagnetic disturbances
expected at any in-plant point of coupling (IPC) within industrial locations, for guidance in the
definition of:
a) limits for disturbance emissions in industrial power distribution systems (including the
planning levels defined in 3.1.5);
NOTE 3 A very wide range of conditions is possible in the electromagnetic environments of industrial networks.
These are approximated in this document by the three classes described in Clause 4. However, it is the responsibility
of the operator of such a network to take account of the particular electromagnetic and economic conditions, including
equipment characteristics, in setting the above-mentioned limits.
b) immunity levels for the equipment within these systems.
The disturbance phenomena considered are:
– voltage deviations;
– voltage dips and short interruptions;
– voltage imbalance;
– power-frequency variations;
– harmonics up to order 40;
th
– interharmonics up to the 40 harmonic;
th
– voltage components above the 40 harmonic up to 150 kHz;
– DC component;
– transient overvoltages.
The compatibility levels are given for different classes of environment determined by the
characteristics of the supply network and loads.
NOTE 4 Compatibility levels at the point of common coupling (PCC) on public networks are specified in
IEC 61000-2-2 for low-voltage networks and IEC 61000-2-12 for medium-voltage networks. IEC TR 61000-3-6 and
IEC TR 61000-3-7 describe the approach of power distribution system operators to the limitation of emissions from
installations and large loads.

IEC 61000-2-4:2024  IEC 2024 – 9 –
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 61000-2-2:2002, Electromagnetic compatibility (EMC) – Part 2-2: Environment –
Compatibility levels for low-frequency conducted disturbances and signalling in public low-
voltage power supply systems
IEC 61000-2-2:2002/AMD1:2017
IEC 61000-2-2:2002/AMD2:2018
IEC 61000-2-12, Electromagnetic compatibility (EMC) – Part 2-12: Environment – Compatibility
levels for low-frequency conducted disturbances and signalling in public medium-voltage power
supply systems
IEC 61000-4-7, Electromagnetic compatibility (EMC) – Part 4-7: Testing and measurement
techniques – General guide on harmonics and interharmonics measurements and
instrumentation, for power supply systems and equipment connected thereto
CISPR 16-1-1, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
CISPR 16-2-1, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 General definitions
3.1.1
electromagnetic disturbance
electromagnetic phenomenon that can degrade the performance of a device, equipment or
system
[SOURCE: IEC 60050-161:2018, 161-01-05, modified – in the definition the words “or adversely
affect living or inert matter” have been deleted and Note 1, Note 2, and Note 3 have been
deleted.]
3.1.2
disturbance level
amount or magnitude of an electromagnetic disturbance, measured and evaluated in a specified
way
– 10 – IEC 61000-2-4:2024  IEC 2024
3.1.3
electromagnetic compatibility
EMC
ability of an equipment or system to function satisfactorily in its electromagnetic environment
without introducing intolerable electromagnetic disturbances to anything in that environment
Note 1 to entry: Electromagnetic compatibility is a condition of the electromagnetic environment such that, for every
phenomenon, the disturbance emission level is sufficiently low and immunity levels are sufficiently high so that all
devices, equipment and systems operate as intended.
Note 2 to entry: Electromagnetic compatibility is achieved only if emission and immunity levels are controlled such
that the immunity level of devices, equipment and systems, at any location, are not exceeded by the disturbance
level at that location, resulting from the cumulative emission of all sources and other factors such as circuit
impedances. Conventionally, compatibility is said to exist if the probability of the departure from intended
performance or of the adverse effect is sufficiently low. See IEC 61000-2-1:1990, Clause 4.
Note 3 to entry: Where the context requires it, compatibility is intended to refer to a single disturbance or class of
disturbances.
Note 4 to entry: Electromagnetic compatibility is a term used also to describe the field of study of the adverse
electromagnetic effect which devices, equipment and systems undergo from each other or from electromagnetic
phenomena.
[SOURCE: IEC 60050-161:2018, 161-01-07, modified – Note 1 to Note 4 have been added.]
3.1.4
(electromagnetic) compatibility level
specified electromagnetic disturbance level used as a reference level in a specified environment
for coordination in the setting of emission and immunity limits
Note 1 to entry: By convention, the compatibility level is chosen so that there is only a small probability that it will
be exceeded by the actual disturbance level.
[SOURCE: IEC 60050-161:1990, 161-03-10, modified – the last sentence of Note 1 is deleted
because it is less relevant in industrial locations compared to public locations.]
3.1.5
planning level
level of a particular disturbance in a particular environment, adopted as a reference value
for the limits to be set for the emission of large loads and installations, in order to coordinate
those limits with all the limits adopted for equipment intended to be connected to the power
supply system
Note 1 to entry: The planning level is locally specific and is adopted by those responsible for planning and operating
the power supply network in the relevant area. (For further explanation, see IEC 61000-2-2:2002, Annex A and
IEC 61000-1-2.)
3.1.6
industrial and private power distribution system
distribution network that is separated by at least one separation transformer from the public
power supply system to which other customer installations are connected
3.1.7
point of common coupling
PCC
point on a public power supply network, electrically nearest to a particular load, at which other
loads are, or could be, connected
Note 1 to entry: The PCC is usually the point for which electromagnetic compatibility in public networks is to be
considered.
[SOURCE: IEC 60050-161:1990, 161-07-15, modified – the two notes have been deleted, the
content of Note 2 is integrated in the definition and a new note has been added.]

IEC 61000-2-4:2024  IEC 2024 – 11 –
3.1.8
industrial location
location characterized by an installation consisting of a separate power distribution
network, supplied by a high- or medium-voltage transformer, dedicated for the supply of
this installation
Note 1 to entry: Industrial locations can generally be described by the existence of an installation with one or more
of the following characteristics:
• significant amount of electrical power generated, transmitted and/or consumed;
• frequent switching of heavy inductive or capacitive loads;
• high currents and associated magnetic fields;
• presence of industrial, high power scientific and medical (ISM) equipment (for example, welding machines).
The electromagnetic environment at an industrial location is predominantly produced by the equipment and
installation present at the location. There are types of industrial locations where some of the electromagnetic
phenomena appear in a more severe degree than in other installations.
Example locations include metalworking, pulp and paper, chemical plants, car production, farm building, high voltage
areas of airports.
Note 2 to entry: The connection between location and electromagnetic environment is given in 3.1.8.
[SOURCE: IEC 61000-6-4:2018, 3.1.12, modified – in the definition, “an installation consisting
of” has been added, and the term reference in Note 2 has been updated.]
3.1.9
electromagnetic environment
totality of electromagnetic phenomena existing at a given location
Note 1 to entry: In general, the electromagnetic environment is time-dependent and its description can be better
described with a statistical approach.
Note 2 to entry: It is very important not to confuse the concept of electromagnetic environment with the surrounding
location.
[SOURCE: IEC 61000-6-4:2018, 3.1.13.]
3.1.10
in-plant point of coupling
IPC
point inside a non-public power distribution system, electrically nearest to a given load, at which
loads from other branches are, or could be, connected
Note 1 to entry: The IPC is usually the point for which electromagnetic compatibility in industrial networks is to be
considered.
3.2 Phenomena-related definitions
NOTE 1 The definitions below that relate to harmonics are based on the analysis of system voltages or currents by
the discrete Fourier transform method (DFT). This is the practical application of the Fourier transform as defined in
IEV 101-13-09. See Annex A.
NOTE 2 The Fourier transform of a function of time, whether periodic or non-periodic, is a function in the frequency
domain and is referred to as the frequency spectrum of the time function, or simply spectrum. If the time function is
periodic the spectrum is constituted of discrete lines (or components). If the time function is not periodic, the spectrum
is a continuous function indicating components at all frequencies.
NOTE 3 Other definitions related to harmonics or interharmonics are given in IEC 60050 (all parts) and other
standards. Some of those other definitions, although not used in this document, are discussed in Annex A.

– 12 – IEC 61000-2-4:2024  IEC 2024
3.2.1
fundamental frequency
frequency, in the spectrum obtained from a Fourier transform of a time function, to which all the
components of this spectrum are referred
Note 1 to entry: In the case of a periodic function, the fundamental frequency is generally equal to the frequency of
the function itself (see Clause A.1.). For the purposes of this document, the fundamental frequency is also the same
as the power supply frequency.
3.2.2
fundamental component
fundamental
spectral component of a periodic time function whose frequency is equal to the fundamental
frequency
3.2.3
harmonic frequency
frequency which is an integer multiple of the fundamental frequency
3.2.4
harmonic order
ratio of the harmonic frequency to the fundamental frequency
Note 1 to entry: The recommended notation for harmonic order is "h".
3.2.5
harmonic component
spectral component of a periodic time function whose frequency is a harmonic frequency
Note 1 to entry: Harmonic components are often referred to as harmonics.
Note 2 to entry: See IEC 61000-4-7 for measuring conditions.
3.2.6
interharmonic frequency
any frequency between two consecutive harmonic frequencies
3.2.7
interharmonic order
ratio of an interharmonic frequency to the fundamental frequency
Note 1 to entry: This ratio is not an integer and can be indicated with "m".
3.2.8
interharmonic component
spectral component having an interharmonic frequency
Note 1 to entry: For brevity, such a component can be referred to simply as an interharmonic.

IEC 61000-2-4:2024  IEC 2024 – 13 –
3.2.9
total harmonic distortion
THD
ratio of the RMS value of the sum of all the harmonic components to the RMS value of the
fundamental component

Q
h
(1)
THD=
∑
Q
1
h=2
where:
Q represents either current or voltage
Q is the RMS value of the fundamental component
h is the harmonic order
Q is the RMS value of the harmonic component of order h
h
3.2.10
partial weighted harmonic distortion
PWHD
ratio of the weighted sum of the squared harmonic components from order 14 to order 40, to
the RMS value of the nominal component n
Q
h
(2)
PWHD h⋅

∑
Q
n
h=14
where:
Q is the nominal value of the quantity (e.g. voltage)
n
h is the harmonic order
Q is the RMS value of the quantity harmonic component of order h
h
3.2.11
voltage unbalance
voltage imbalance
condition in a polyphase system in which the r.m.s. values of the fundamental component of
the line-to-line voltages, or the phase angle between consecutive line-to-line voltages, are not
all equal
Note 1 to entry: Generally, in relation to three-phase systems, the amount of voltage imbalance is quantified by the
ratio between the negative sequence components and the positive sequence components. However, in some
circumstances, it is more appropriate to use the ratio between zero sequence and positive sequence components.
=
– 14 – IEC 61000-2-4:2024  IEC 2024
Note 2 to entry: Several approximations give reasonably accurate results for the levels of imbalance normally
encountered (ratio of negative to positive sequence components), for example:
22 2
UU+ +U
12 23 31
voltage unbalance (imbalance)  =62×−
(3)
UU+ +U
( )
12 23 31
where
U , U , U are the three fundamental line-to-line voltages
12 23 31
[SOURCE: IEC 60050-161:1990, 161-08-09, modified – the definition was simplified and the
reference to the “zero sequence component” was moved from the core of the definition to
Note 1.]
3.2.12
voltage deviation
increase or decrease of the power supply RMS voltage, excluding transients with no remaining
effects
Note 1 to entry: Voltage variations and voltage fluctuations are the major types of voltage deviations. Some voltage
variations are fast due to the supply voltage adapting to different load conditions (for example, voltage taps changes
of transformers, permanent effect of capacitor bank switching). Voltage fluctuations, which can cause flicker, are a
different phenomenon (series of voltage deviations or cyclical voltage deviations, see IEC 61000-2-2:2002 and
IEC 61000-2-2:2002/AMD2:2019, 4.2).
3.2.13
voltage dip
voltage sag
temporary reduction of the voltage magnitude at a point in the electrical system below a
threshold
Note 1 to entry: Typically a dip is associated with the occurrence and termination of a short circuit or other extreme
current increase on the system or installations connected to it.
Note 2 to entry: Generally the dip threshold voltage corresponds to the minimum value of the nominal voltage
tolerance.
3.2.14
transient overvoltage
overvoltage with a duration of a few milliseconds or less, oscillatory or non-oscillatory, usually
highly damped
Note 1 to entry: Transient overvoltages can be immediately followed by temporary overvoltages. In such cases the
two overvoltages are considered as separate events.
[SOURCE: IEC 60050-614:2016, 614-03-14, modified – Note 2 has been deleted.]
3.2.15
industrial power electronic equipment
equipment not intended to be connected in a residential location and having emission and
immunity either equal to or higher
...