IEC 62041:2017

Transformers, power supplies, reactors and similar products - EMC requirements

IEC 62041: 2017 is applicable to transformers, reactors and power supply units covered by the IEC 61558 series of standards. This document deals with the electromagnetic compatibility requirements for emission and immunity within the frequency range 0 Hz to 400 GHz. No tests need to be performed at frequencies where no requirements are specified.
This third edition cancels and replaces the second edition published in 2010. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
the inclusion of a clause on tests in series production;
the inclusion of a new clause on measurement uncertainly, and
the status of a harmonized standard for this third edition.
It has the status of a product family EMC standard in accordance with IEC Guide 107:2009,
Electromagnetic compatibility – Guide to the drafting of electromagnetic compatibility publications.

Transformateurs, alimentations, bobines d’inductance et produits analogues - Exigences CEM

L'IEC 62041:2017 s’applique aux transformateurs, bobines d’inductance et aux blocs d’alimentation couverts par la série de normes IEC 61558. Le présent document traite des exigences de compatibilité électromagnétique pour l’émission et l’immunité dans la bande de fréquences comprise entre 0 Hz et 400 GHz. Aucun essai n’est nécessaire aux fréquences pour lesquelles aucune exigence n’est spécifiée. Cette troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
ajout d’un article sur les essais de production en série;
ajout d’un nouvel article sur l’incertitude des mesures, et
statut de norme harmonisée pour cette troisième édition.
Elle a le statut d’une norme CEM de famille de produits conformément au Guide IEC 107:2009,
Compatibilité électromagnétique – Guide pour la rédaction des publications sur la compatibilité électromagnétique.
La présente version bilingue (2018-01) correspond à la version anglaise monolingue publiée en 2017-08. La version française de cette norme n'a pas été soumise au vote.

General Information

• Status: Published
• Publication Date: 09-Aug-2017
• ICS: 29.080.20 - Bushings
• ICS: 29.180 - Transformers. Reactors
• ICS: 33.100.01 - Electromagnetic compatibility in general
• Technical Committee: TC 96 - Transformers and reactors
• Drafting Committee: MT 62041 - TC 96/MT 62041
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2017
• Completion Date: 10-Aug-2017

Relations

• Revises: IEC 62041:2010 - Safety of transformers, reactors, power supply units and combinations thereof - EMC requirements
• Effective Date: 05-Sep-2023

Overview

IEC 62041:2017 - Transformers, power supplies, reactors and similar products – EMC requirements specifies electromagnetic compatibility (EMC) requirements for transformers, reactors and power‑supply units covered by the IEC 61558 series. The standard addresses both emission and immunity over the frequency range 0 Hz to 400 GHz and applies to devices in normal operation. This third edition (2017) is a technical revision that adds clauses on series production tests, measurement uncertainty, and records the standard’s harmonized status as a product‑family EMC standard (IEC Guide 107).

Key topics and requirements

• Scope and applicability: Targets standalone transformers, reactors and power supplies covered by IEC 61558. It does not apply to UPS (IEC 62040), many DC converters (IEC 61204) or lamp/control gear (IEC 61347).
• Emission and immunity limits: Defines port‑based requirements (enclosure, signal, AC/DC power ports) with tables of limits referenced in Annex A. Where multiple requirements apply, the most stringent takes precedence.
• Frequency range: Requirements and tests cover 0 Hz – 400 GHz; no tests are required at frequencies where limits are not specified.
• Test procedures and equipment: Specifies conditions during testing, measurement procedures for emission/immunity, and performance criteria for pass/fail assessment.
• Production testing: Includes a clause for routine (series) production tests to ensure ongoing conformity.
• Measurement uncertainty: Introduces requirements for assessing and reporting measurement uncertainty in EMC testing.
• Normative references: Cross‑references EMC and limits standards (e.g., IEC 61000 series, CISPR guidance and IEC vocabulary entries).

Practical applications and users

IEC 62041:2017 is used by:

• Manufacturers of transformers, reactors and power supplies to design for EMC compliance and to prepare technical documentation.
• EMC laboratories and test houses performing type testing, pre‑compliance and routine production checks.
• Product compliance and regulatory teams assessing conformity for market access where EMC requirements apply.
• Systems integrators and OEMs who incorporate transformers or power supplies into larger appliances - it also serves as a guide for separate testing before incorporation.
• Design engineers applying emission/immunity limits to component selection, shielding and filtering.

Benefits include improved product immunity to electromagnetic disturbances, reduced radiated/conducted emissions, and streamlined compliance when referenced alongside IEC 61558.

Related standards

• IEC 61558 series (safety of transformers and power supplies)
• IEC 61000 series (EMC immunity and emission families, e.g., IEC 61000‑6‑1/2/3/4)
• IEC 62040 (UPS standards - exclusion)
• IEC 61204, IEC 61347 (product family exclusions)
• IEC 60050‑161 (EMC vocabulary) and relevant CISPR guidance

Keywords: IEC 62041:2017, EMC requirements, transformers, power supplies, reactors, emission, immunity, 0 Hz to 400 GHz, IEC 61558, measurement uncertainty, series production testing.

Standards Content (Sample)

IEC 62041 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
Transformers, power supplies, reactors and similar products – EMC
requirements
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IEC 62041 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
Transformers, power supplies, reactors and similar products – EMC

requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.180; 33.100.01 ISBN 978-2-8322-4634-4

– 2 – IEC 62041:2017 © IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 9
4 General considerations . 10
4.1 Categories . 10
4.2 Measurement uncertainty . 10
4.3 Routine tests (production tests) . 11
5 Product documentation . 11
6 Applicability . 11
7 Test equipment . 12
8 Conditions during testing . 12
9 Measurement procedures . 12
9.1 Emission . 12
9.2 Immunity . 12
10 Performance criteria . 13
11 Requirements . 14
11.1 Immunity . 14
11.2 Emission . 14
Annex A (informative) Tables for immunity and emission limits . 16
Bibliography . 30

Figure 1 – Ports covered by Table A.1 to Table A.16 . 9

Table 1 – Additional acceptance limit for statistical determination . 10
Table 2 – Values of k according to CISPR TR 16-4-3:2004, Table C.1 . 11
E
Table 3 – Uncertainties for emission tests . 11
Table A.1 – Immunity requirements for enclosure ports for equipment intended for use
in residential, commercial and light-industrial environments according to IEC 61000-6-1 . 16
Table A.2 – Immunity requirements for enclosure ports for equipment intended for use
in industrial environments according to IEC 61000-6-2 . 17
Table A.3 – Immunity requirements for signal ports for equipment intended for use in
residential, commercial and light-industrial environments according to IEC 61000-6-1 . 17
Table A.4 – Immunity requirements for signal ports for equipment intended for use in
industrial environments according to IEC 61000-6-2 . 18
Table A.5 – Immunity requirements at input and output DC power ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-1 . 19
Table A.6 – Immunity requirements at input and output DC power ports for equipment
intended for use in industrial environments according to IEC 61000-6-2. 20
Table A.7 – Immunity requirements at input and output AC power ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-1 . 21

Table A.8 – Immunity requirements at input and output AC power ports for equipment
intended for use in industrial environments according to IEC 61000-6-2. 22
Table A.9 – Requirements for radiated emissions for equipment intended for use in
residential, commercial and light-industrial environments according to IEC 61000-6-3 . 23
Table A.10 – Requirements for radiated emissions ports for equipment intended for
use in industrial environments according to IEC 61000-6-4 . 24
Table A.11 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in residential, commercial and light-industrial environments
according to IEC 61000-6-3 . 27
Table A.12 – Requirements for conducted emissions from AC mains power ports
according to IEC 61000-6-4 . 27
Table A.13 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in residential, commercial and light-industrial environments
according to IEC 61000-6-3 . 28
Table A.14 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in industrial environments according to IEC 61000-6-4 . 28
Table A.15 – Requirements for conducted emissions from signal ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-3 . 29
Table A.16 – Requirements for conducted emissions from signal ports for equipment
intended for use in industrial environments according to IEC 61000-6-4. 29

– 4 – IEC 62041:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TRANSFORMERS, POWER SUPPLIES, REACTORS
AND SIMILAR PRODUCTS –
EMC requirements
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
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 62041 has been prepared by Technical Committee 96:
Transformers, reactors, power supply units and combinations thereof.
This third edition cancels and replaces the second edition published in 2010. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• the inclusion of a clause on tests in series production;
• the inclusion of a new clause on measurement uncertainly, and
• the status of a harmonized standard for this third edition.
It has the status of a product family EMC standard in accordance with IEC Guide 107:2009,

Electromagnetic compatibility – Guide to the drafting of electromagnetic compatibility
publications.
The text of this International Standard is based on the following documents:
FDIS Report on voting
96/465/FDIS 96/467/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is to be used in conjunction with the IEC 61558 series.
In this standard, the following print types are used:
• requirements proper: in roman type;
• test specifications: in italic type;
• explanatory matter: in smaller roman type.
In the text of this publication, the words in bold are defined in Clause 3 of this document and
in the IEC 61558 series.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
NOTE The attention of the National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 12 months or not later than 3 years from the date of publication.
The transitional period is no longer than 3 years after the publication of this standard.

– 6 – IEC 62041:2017 © IEC 2017
TRANSFORMERS, POWER SUPPLIES, REACTORS
AND SIMILAR PRODUCTS –
EMC requirements
1 Scope
This document is applicable to transformers, reactors and power supply units covered by the
IEC 61558 series of standards. This document deals with the electromagnetic compatibility
requirements for emission and immunity within the frequency range 0 Hz to 400 GHz. No tests
need to be performed at frequencies where no requirements are specified.
For associated transformers, associated reactors and associated power supply units either
supplied with or incorporated into an appliance or equipment the relevant EMC standard for
that appliance or equipment applies.
This document covers normal operating conditions only. Other operations of the transformers,
reactors and power supply units (e.g. simulated faults in the electric circuitry for testing
purposes or functional safety due to the effects of the electromagnetic phenomena, or
evaluation of human being for exposure to electromagnetic fields (EMF)) have not been taken
into consideration in this document.
Requirements are specified for each port considered. If requirements are different the most
severe takes precedence.
This document may also be used as a guide to test transformers, reactors and power supply
units separately before these are incorporated into an appliance or equipment.
NOTE When EUT (Equipment under test) is used, it covers transformers, reactors and power supply units
where applicable.
This document does not apply to:
• uninterruptible power supplies (UPS) covered by IEC 62040 (all parts);
• power supply units covered by IEC 61204,
(i.e. DC-DC converters, DC power and distribution equipment and power supply units for
use in applications covered by IEC 60950-1, IEC 61010-1, IEC 60601-1 and IEC 60065);
• power supplies and converters for use with or in products covered by IEC 61347 (all
parts).
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 60050-161, International Electrotechnical Vocabulary – Chapter 161: Electromagnetic
compatibility
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤ 16 A per phase)

IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment
with rated current ≤ A per phase and not subject to conditional connection
IEC 61000-3-11, Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage supply systems –
Equipment with rated current ≤ 75 A and subject to conditional connection
IEC 61000-3-12, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current > 16 A and ≤ 75 A per phase
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3 : Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-11, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measurement
techniques – Voltage dips, short interruptions and voltage variations immunity tests
IEC 61000-4-34, Electromagnetic compatibility (EMC) – Part 4-34: Testing and measurement
techniques – Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current more than 16 A per phase
IEC 61000-6-1, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity standard for residential, commercial and light-industrial environments
IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standard for industrial environments
IEC 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 61558 (all parts), Safety of power transformers, power supplies, reactors and similar
products
CISPR 14-1:2016, Electromagnetic compatibility – Requirements for household appliances,
electric tools and similar apparatus – Part 1: Emission
CISPR 16-1-1:2015, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
– 8 – IEC 62041:2017 © IEC 2017
CISPR 16-1-2:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Coupling
devices for conducted disturbance measurements
CISPR 16-1-4:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Antennas
and test sites for radiated disturbance measurements
CISPR 16-1-4:2010/AMD1:2012
CISPR 16-2-1:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
CISPR 16-2-3:2016, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-4-2, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 4-2: Uncertainties, statistics and limit modelling – Measurement
instrumentation uncertainty
CISPR 32:2015, Electromagnetic compatibility of multimedia equipment – Emission
requirements
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
equipment under test
transformers, reactors and power supply units where applicable
3.1.2
port
particular interface of the specified EUT with the external electromagnetic environment.
Note 1 to entry: Examples of ports of interest are shown in Figure 1. The enclosure port is the physical boundary
of the equipment (e.g. enclosure). The enclosure port provides for radiated and electrostatic discharge (ESD)
energy transfer, whereas the other ports provide for conducted energy transfer, either by direct injection or by
induction.
Note 2 to entry: In some cases, different ports may be combined.

Enclosure port
Signal port AC power port
EUT
DC power port
IEC
Figure 1 – Ports covered by Table A.1 to Table A.16
3.1.3
enclosure port
physical boundary of the EUT which electromagnetic fields may radiate through or impinge on
3.1.4
cable port
port at which a conductor or a cable is connected to the EUT
Note 1 to entry: Examples are signal, control and power ports.
3.1.5
signal port
port at which a conductor or cable intended to carry signals is connected to the EUT
Note 1 to entry: Examples are analogue inputs, outputs and control lines, data busses, communication networks,
etc.
3.1.6
power port
port at which a conductor or cable carrying the primary electrical power needed for the
operation (functioning) of an EUT is connected
3.1.7
public mains network
electricity lines to which all categories of consumers have access and which are operated by
a supply or distribution undertaking for the purpose of supplying electrical energy
3.1.8
low voltage
voltage having a value below a conventionally adopted limit
Note 1 to entry: For the distribution of AC electric power, the upper limit is generally accepted to be 1 000 V.
[SOURCE: IEC 60050-151:2001, 151-15-03]
3.2 Abbreviations
AC Alternating Current
AM Amplitude Modulation
DC Direct Current
EUT Equipment Under Test
FAR Fully Anechoic Room
ISN Impedance Stabilization Network
LV Low Voltage
OATS Open Area Test Site
– 10 – IEC 62041:2017 © IEC 2017
SAC Semi Anechoic Chamber
TEM Transverse Electromagnetic Mode
4 General considerations
4.1 Categories
EUT are classified according to the incorporation of components and electronic circuits as
follows:
• category 0: EUT with or without passive protection components and without electronic
circuits,
• category 1: EUT with passive components, and without electronic circuits,
• category 2: EUT with electronic circuits.
NOTE 1 Examples of passive protection components are fuses, thermal links, thermal cut-outs, circuit-breakers,
PTC’s, NTC’s and resistors.
NOTE 2 Examples of passive components are capacitors, inductors, diodes, LED’s, relays, VDR’s.
NOTE 3 Examples of electronic circuits are active semiconductors.
4.2 Measurement uncertainty
Compliance testing with the limits described in this document shall be carried out statistically
according to Table 1. Emission tests shall be executed in accordance with Annex A by using
at least 5 samples. In case of exceptional conditions, the sum of test samples can be reduced
to 3 or 4 samples.
The requirements are fulfilled, if the measured emissions of all individual samples are in
compliance with the limits and the gap to the limit is not smaller than specified in Table 1.
Table 1 – Additional acceptance limit for statistical determination
Sample size 3 4 5 6
Additional acceptance limit (dB) 3,8 2,5 1,5 0,7

This procedure shall not be used to show the non-compliance of the product.
NOTE This procedure is based on CISPR TR 16-4-3.
Compliance is constituted by
x + k × σ < L
max E max
where
x is the highest (unfavourable) value of all samples of the sample size;
max
k is the coefficient taken from the Table 2 in view of sample size;
E
σ is the conservative standard regression of product group;
max
L is the permissible limit.
Table 2 – Values of k according to CISPR TR
E
16-4-3:2004, Table C.1
Sample size 3 4 5 6
Coefficient k 0,63 0,41 0,24 0,12
E
IEC/CISPR/TR 16-4-3 recommends σ = 6 dB for conducted emissions. For radiated
max
emissions the same value of σ can be used. Values shown in Table 1 constitute a simple
max
multiplication of k and σ = 6 dB.
E max
Table 1 is only valid for sample sizes up to 6. If more samples are used to check compliance,
a different procedure may be used (binominal distribution without additional gap to the limit).
4.3 Routine tests (production tests)
The assessment of compliance with the requirements of this document shall be carried out by
normative tests. The uncertainty of measurement shall be taken into account.
Wherever possible, the measurement uncertainty shall be covered in accordance with
CISPR 16-4-2.
NOTE 1 Measurements conducted at the place of installation, the share of place is not taken into account.
Measurements carried out at distances smaller than 10 m, higher uncertainty may need to be
used.
Table 3 – Uncertainties for emission tests
Test Uncertainty
dB
a
Conducted emissions (150 kHz to 30 MHz) using a 50Ω/50µH ISN 3,44
b
Radiated emissions (30 MHz to 200 MHz) – Horizontal polarisation – 10 m 5,05
b
Radiated emissions (30 MHz to 200 MHz) – Vertical polarisation – 10 m 5,03
c
Radiated emissions (200 MHz to 1 GHz) – Horizontal polarisation – 10 m 5,21
c
Radiated emissions (200 MHz to 1 GHz) – Vertical polarisation – 10 m 5,22
a
Impedance stabilisation network (ISN).
b
Uncertainty for the use of biconical antennas.
c
Uncertainty for the use of logarithmical-periodical antennas.

5 Product documentation
The user documentation and/or manual shall contain details of any special measures required
to be taken by the purchaser or user to ensure the EMC compliance of the EUT with the
requirements of this publication. One example would be the need to use shielded or special
cables.
6 Applicability
The application of tests for evaluation of immunity depends on the particular apparatus, its
configuration, its ports, its technology and its operating conditions.

– 12 – IEC 62041:2017 © IEC 2017
Tests shall be applied to the relevant ports of the EUT according to Table A.1 to Table A.16.
Tests shall only be carried out where the relevant ports exist.
It may be determined from consideration of the electrical characteristics and usage of a
particular EUT that some of the tests are inappropriate and therefore unnecessary. In such a
case, it is required that the decision and justification not to test shall be recorded in the test
report.
7 Test equipment
The description of the measurement, the measurement instrumentation, the measurement
methods and the measurement set up to be used is given in Tables A.1 to A.16.
8 Conditions during testing
If the apparatus is part of a system, or can be connected to auxiliary apparatus, the apparatus
shall be tested while connected to the minimum representative configuration of auxiliary
apparatus necessary to exercise the ports in a similar manner to that described in CISPR 32.
In cases where manufacturer´s specification requires external filtering and/or shielding
devices or measures that are clearly specified in the user´s manual, the measurement
requirements of this document shall be applied with the specified devices or measures in
place.
The configuration and mode of operation during the measurements shall be precisely noted in
the test report. If the apparatus has a large number of similar ports or ports with many similar
connections, a sufficient number shall be selected to simulate actual operating conditions and
to ensure that all different types of determination are covered.
The measurements shall be carried out at one single set of parameters within the operating
ranges of temperature, humidity and atmospheric pressure specified for the product and at the
rated supply voltage, unless otherwise indicated in the basic standard.
Where applicable, additional information on EUT configuration can be found in CISPR 16-2
(all parts) and CISPR 32.
9 Measurement procedures
9.1 Emission
The equipment under test (EUT) shall be tested in the operating mode producing the largest
emission in the frequency band being investigated, e.g. based on limited pre-tests and
consistent with normal applications. The configuration of the test sample shall be varied to
achieve maximum emission consistent with typical applications and installation practice.
The emission requirements for EUT covered by this document are given on a port by port
basis. These requirements are stated in Tables A.9 to A.16.
Measurements shall be conducted in a well-defined and reproducible manner. The
measurements may be performed in any order.
9.2 Immunity
The equipment under test (EUT) shall be tested in the expected most susceptible operating
mode e.g. identified by performing limited pre-tests. This mode shall be consistent with

normal applications. The configuration of the test sample shall be varied to archive maximum
susceptibility with typical applications and installation practice.
The immunity test requirements for EUT covered by this document are given on a port by
port basis.
Tests shall be conducted in a well-defined and reproducible manner.
The tests shall be carried out individually as single tests in sequence. The tests may be
performed in any order. If requirements are in conflict the most severe takes precedence.
The description of the test, relevant generator, appropriate methods, and the set up to be
used are given in basic standards, which are referred to in Tables A.1 to A.8.
The contents of these basic standards are not repeated here, however modifications or
additional information and test levels needed for the practical application of the tests are
given in this document.
10 Performance criteria
The variety and the diversity of the EUT within the scope of this document makes it difficult to
define precise criteria for the evaluation of the immunity test results.
If, as a result of the application of the tests defined in this document, the apparatus becomes
dangerous or unsafe, the apparatus shall be deemed to have failed the test.
A functional description and a definition of performance criteria, during or as a consequence
of the EMC testing, shall be provided by the manufacturer and noted in the test report, based
on one of the following criteria for each test as specified in Tables A.1 to A.8.
Performance criterion A: The EUT shall continue to operate as intended during and after the
test. No degradation of performance or loss of function is allowed below a performance level
specified by the manufacturer, when the EUT is used as intended. The performance level may
be replaced by a permissible loss of performance. If the minimum performance level or the
permissible performance loss is not specified by the manufacturer, either of these may be
derived from the product description and documentation and what the user may reasonably
expect from the EUT if used as intended.
Performance criterion B: The EUT shall continue to operate as intended after the test. No
degradation of performance or loss of function is allowed below a performance level specified
by the manufacturer, when the EUT is used as intended. The performance level may be
replaced by a permissible loss of performance. During the test, degradation of performance is
however allowed. No change of actual operating state or stored data is allowed. If the
minimum performance level or the permissible performance loss is not specified by the
manufacturer, either of these may be derived from the product description and documentation
and what the user may reasonably expect from the EUT if used as intended.
Performance criterion C: Temporary loss of function is allowed, provided the function is self-
recoverable or can be restored by the operation of the controls.

– 14 – IEC 62041:2017 © IEC 2017
11 Requirements
11.1 Immunity
The immunity requirements applicable to equipment covered within the scope of this
publication shall be selected from Tables A.1 to A.8 as specified below. Where requirements
are different the most severe takes precedence.
All EUT directly powered by the AC network shall meet the requirements of Table A.7, table
clauses 7.2 and 7.3, for current less than 16 A per phase and Table A.8, table clauses 8.2
and 8.3, for current more than 16 A per phase as regards voltage dips and interruptions of the
mains supply caused generally by faults on the network.
Category 0 EUT are not sensitive to normal electromagnetic perturbations. Consequently,
they are deemed to fulfil the immunity requirements without testing.
Category 1 EUT shall fulfil the immunity requirements for electrostatic discharges, electrical
fast transients and surges as follows:
• for electrostatic discharge, refer to Table A.1 and Table A.2, as applicable;
NOTE 1 Some passive components such as small capacitors (e.g. Y-type), diodes, LEDs or relays can be
sensitive to electrostatic discharges.
• for electrical fast transient/burst, refer to Table A.3, Table A.4, Table A.5, Table A.6, Table
A.7 and Table A.8, as applicable;
NOTE 2 Some passive components such as small capacitors (e.g. Y-type), diodes, LEDs, or relays can be
sensitive to electrical fast transients.
• for surge, refer to Table A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable.
NOTE 3 Some passive components such as small capacitors (e.g. Y-type), diodes, LED or relays can be
sensitive to surges.
Category 2 EUT shall fulfil the immunity requirements for electrostatic discharges, electrical
fast transients, surges, conducted radio-frequency disturbances, radiated radio-frequency
disturbances and for voltage dips and interruptions as follows:
• for electrostatic discharge, refer to Table A.1 and Table A.2, as applicable;
• for electrical fast transient/burst, refer to Table A.3, Table A.4, Table A.5, Table A.6, Table
A.7 and Table A.8, as applicable;
• for surge, refer to Table A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable;
• for conducted disturbances, inducted by radio-frequency fields, refer to Table A.3, Table
A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable;
• for radiated, radio-frequency electromagnetic fields, refer to Table A.1 and Table A.2, as
applicable;
• for voltage dips and short interruptions, refer to Table A.7 and Table A.8, as applicable.
The necessity to conduct some of the tests may be determined in accordance with the
electrical characteristics and the specific application of the particular transformer. In such
cases the rationale for not conducting the tests shall be stated in the test report.
11.2 Emission
The emission requirements for equipment covered within the scope of this publication shall be
selected from Tables A.9 to A.16 as specified below. Where requirements are different the
most severe takes precedence.
EUT according to Category 0 as defined in 4.1 having a working voltage not exceeding 700 V
do not generate electromagnetic interferences with a considerable level and as a
consequence are deemed to fulfil the emission requirements without testing.
EUT according to Category 0 as defined in 4.1 having a working voltage exceeding 700 V are
considered to generate electromagnetic interference. Consequently, the following
requirements in accordance with CISPR 32 and CISPR 14-1 shall be carried out:
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.
Category 1 EUT having a working voltage not exceeding 700 V shall fulfil the following
requirements given in IEC 61000-3-2, IEC 61000-3-3, IEC 61000-3-11, IEC 61000-3-12,
CISPR 32, and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable.
Category 1 EUT having a working voltage exceeding 700 V shall fulfil the following
requirements given in IEC 61000-3-2, IEC 61000-3-3, IEC 61000-3-11, IEC 61000-3-12,
CISPR 32 and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.
Category 2 EUT shall fulfil the following requirements given in IEC 61000-3-2, IEC 61000-3-3,
IEC 61000-3-11, IEC 61000-3-12, CISPR 32 and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.

– 16 – IEC 62041:2017 © IEC 2017
Annex A
(informative)
Tables for immunity and emission limits
This Annex contains tables defining requirements to be selected in accordance with the
criteria specified in Clause 11.
Table A.1 – Immunity requirements for enclosure ports for equipment intended for use
in residential, commercial and light-industrial environments according to IEC 61000-6-1
Table Environmental Test Units Basic Remarks Performance
clause phenomena specifica- standards criterion
tions
a
1.1 Radio-frequency 80 to 1 000 MHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS
3 V/m
field, amplitude value of the
modulated unmodulated carrier.
80 % AM
(1 kHz)
a
1.2 Radio-frequency 1,4 to 2,0 GHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS
3 V/m
field, amplitude value of the
b
modulated unmodulated carrier.
80 % AM
(1 kHz)
a
1.3 Radio-frequency 2,0 to 2,7 GHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS
1 V/m
field, amplitude value of the
b
modulated unmodulated carrier.
80 % AM
(1 kHz)
1.4 Electro- Contact ±4 (charge kV IEC 61000-4-2 See basic standard B
static discharge voltage) for applicability of
discharge contact and/or air
Air ±8 (charge kV B
discharge test.
discharge voltage)
a
IEC 61000-4-20 may be used for small EUTs as defined in IEC 61000-4-20:2010, 6.1.
b
The frequency range has been selected to cover the frequencies with the highest potential risk of a
disturbance.
Table A.2 – Immunity requirements for enclosure ports for equipment intended
for use in industrial environments according to IEC 61000-6-2
Table Environmental Test Units Basic Remarks Performance
clause phenomena specifications standards criterion
a
2.1 Radio-frequency 80 to 1 000 MHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS.
10 V/m
field, amplitude value of the
modulated unmodulated carrier.
80 % AM
(1 kHz)
a
2.2 Radio-frequency 1,4 to 2,0 GHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS
3 V/m
field, amplitude value of the
b
modulated unmodulated carrier.
80 % AM
(1 kHz)
a
2.3 Radio-frequency 2,0 to 2,7 GHz IEC 61000-4-3 The test level A
electromagnetic specified is the RMS
1 V/m
field, amplitude value of the
b
modulated unmodulated carrier.
80 % AM
(1 kHz)
2.4 Electro- Contact ±4 (charge kV IEC 61000-4-2 See basic standard B
static dischar voltage) for applicability of
discharge ge contact and/or air
discharge test.
Air ±8 (charge kV B
dischar voltage)
ge
a
IEC 61000-4-20 may be used for small EUTs as defined in IEC 61000-4-20:2010, 6.1.
b
The frequency range has been selected to cover the frequencies with the highest potential risk of a
disturbance.
Table A.3 – Immunity requirements for signal ports for equipment intended for use in
residential, commercial and light-industrial environments according to IEC 61000-6-1
Table Environmental Test Units Basic Remarks Performance
clause phenomena specifications standards criterion
3.1 Radio- 0,15 to 80 MHz IEC 61000-4-6 The test level A
frequency specified is the RMS
3 V
common mode value of the
unmodulated carrier.
80 % AM a,b
(1 k
...

IEC 62041 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transformers, power supplies, reactors and similar products –
EMC requirements
Transformateurs, alimentations, bobines d’inductance et produits analogues –
Exigences CEM
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IEC 62041 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Transformers, power supplies, reactors and similar products –

EMC requirements
Transformateurs, alimentations, bobines d’inductance et produits analogues –

Exigences CEM
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.180; 33.100.01 ISBN 978-2-8322-5231-4

– 2 – IEC 62041:2017 © IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions . 8
3.2 Abbreviations . 9
4 General considerations . 10
4.1 Categories . 10
4.2 Measurement uncertainty . 10
4.3 Routine tests (production tests) . 11
5 Product documentation . 11
6 Applicability . 11
7 Test equipment . 12
8 Conditions during testing . 12
9 Measurement procedures . 12
9.1 Emission . 12
9.2 Immunity . 12
10 Performance criteria . 13
11 Requirements . 14
11.1 Immunity . 14
11.2 Emission . 14
Annex A (informative) Tables for immunity and emission limits . 16
Bibliography . 30

Figure 1 – Ports covered by Table A.1 to Table A.16 . 9

Table 1 – Additional acceptance limit for statistical determination . 10
Table 2 – Values of k according to CISPR TR 16-4-3:2004, Table C.1 . 11
E
Table 3 – Uncertainties for emission tests . 11
Table A.1 – Immunity requirements for enclosure ports for equipment intended for use
in residential, commercial and light-industrial environments according to IEC 61000-6-1 . 16
Table A.2 – Immunity requirements for enclosure ports for equipment intended for use
in industrial environments according to IEC 61000-6-2 . 17
Table A.3 – Immunity requirements for signal ports for equipment intended for use in
residential, commercial and light-industrial environments according to IEC 61000-6-1 . 17
Table A.4 – Immunity requirements for signal ports for equipment intended for use in
industrial environments according to IEC 61000-6-2 . 18
Table A.5 – Immunity requirements at input and output DC power ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-1 . 19
Table A.6 – Immunity requirements at input and output DC power ports for equipment
intended for use in industrial environments according to IEC 61000-6-2. 20
Table A.7 – Immunity requirements at input and output AC power ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-1 . 21

Table A.8 – Immunity requirements at input and output AC power ports for equipment
intended for use in industrial environments according to IEC 61000-6-2. 22
Table A.9 – Requirements for radiated emissions for equipment intended for use in
residential, commercial and light-industrial environments according to IEC 61000-6-3 . 23
Table A.10 – Requirements for radiated emissions ports for equipment intended for
use in industrial environments according to IEC 61000-6-4 . 25
Table A.11 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in residential, commercial and light-industrial environments
according to IEC 61000-6-3 . 27
Table A.12 – Requirements for conducted emissions from AC mains power ports
according to IEC 61000-6-4 . 27
Table A.13 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in residential, commercial and light-industrial environments
according to IEC 61000-6-3 . 28
Table A.14 – Requirements for conducted emissions from AC mains power ports for
equipment intended for use in industrial environments according to IEC 61000-6-4 . 28
Table A.15 – Requirements for conducted emissions from signal ports for equipment
intended for use in residential, commercial and light-industrial environments according
to IEC 61000-6-3 . 29
Table A.16 – Requirements for conducted emissions from signal ports for equipment
intended for use in industrial environments according to IEC 61000-6-4. 29

– 4 – IEC 62041:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TRANSFORMERS, POWER SUPPLIES, REACTORS
AND SIMILAR PRODUCTS –
EMC requirements
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
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 62041 has been prepared by Technical Committee 96:
Transformers, reactors, power supply units and combinations thereof.
This third edition cancels and replaces the second edition published in 2010. It constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• the inclusion of a clause on tests in series production;
• the inclusion of a new clause on measurement uncertainly, and
• the status of a harmonized standard for this third edition.
It has the status of a product family EMC standard in accordance with IEC Guide 107:2009,

Electromagnetic compatibility – Guide to the drafting of electromagnetic compatibility
publications.
This bilingual version (2018-01) corresponds to the monolingual English version, published in
2017-08.
The text of this International Standard is based on the following documents:
FDIS Report on voting
96/465/FDIS 96/467/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
The French version of this standard has not been voted upon.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is to be used in conjunction with the IEC 61558 series.
In this standard, the following print types are used:
• requirements proper: in roman type;
• test specifications: in italic type;
• explanatory matter: in smaller roman type.
In the text of this publication, the words in bold are defined in Clause 3 of this document and
in the IEC 61558 series.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE The attention of the National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 12 months or not later than 3 years from the date of publication.
The transitional period is no longer than 3 years after the publication of this standard.

– 6 – IEC 62041:2017 © IEC 2017
TRANSFORMERS, POWER SUPPLIES, REACTORS
AND SIMILAR PRODUCTS –
EMC requirements
1 Scope
This document is applicable to transformers, reactors and power supply units covered by the
IEC 61558 series of standards. This document deals with the electromagnetic compatibility
requirements for emission and immunity within the frequency range 0 Hz to 400 GHz. No tests
need to be performed at frequencies where no requirements are specified.
For associated transformers, associated reactors and associated power supply units either
supplied with or incorporated into an appliance or equipment, the relevant EMC standard for
that appliance or equipment applies.
This document covers normal operating conditions only. Other operations of the transformers,
reactors and power supply units (e.g. simulated faults in the electric circuitry for testing
purposes or functional safety due to the effects of the electromagnetic phenomena, or
evaluation of human being for exposure to electromagnetic fields (EMF)) have not been taken
into consideration in this document.
Requirements are specified for each port considered. If requirements are different, the most
severe takes precedence.
This document may also be used as a guide to test transformers, reactors and power supply
units separately before these are incorporated into an appliance or equipment.
NOTE When EUT (Equipment under test) is used, it covers transformers, reactors and power supply units
where applicable.
This document does not apply to:
• uninterruptible power supplies (UPS) covered by IEC 62040 (all parts);
• power supply units covered by IEC 61204,
(i.e. DC-DC converters, DC power and distribution equipment and power supply units for
use in applications covered by IEC 60950-1, IEC 61010-1, IEC 60601-1 and IEC 60065);
• power supplies and converters for use with or in products covered by IEC 61347 (all
parts).
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 60050-161, International Electrotechnical Vocabulary – Chapter 161: Electromagnetic
compatibility
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic
current emissions (equipment input current ≤ 16 A per phase)

IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment
with rated current ≤ 16 A per phase and not subject to conditional connection
IEC 61000-3-11, Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage supply systems –
Equipment with rated current ≤ 75 A and subject to conditional connection
IEC 61000-3-12, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current > 16 A and ≤ 75 A per phase
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3 : Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced by radio-frequency fields
IEC 61000-4-11, Electromagnetic compatibility (EMC) – Part 4-11: Testing and measurement
techniques – Voltage dips, short interruptions and voltage variations immunity tests
IEC 61000-4-34, Electromagnetic compatibility (EMC) – Part 4-34: Testing and measurement
techniques – Voltage dips, short interruptions and voltage variations immunity tests for
equipment with input current more than 16 A per phase
IEC 61000-6-1, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity standard for residential, commercial and light-industrial environments
IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standard for industrial environments
IEC 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 61558 (all parts), Safety of power transformers, power supplies, reactors and similar
products
CISPR 14-1:2016, Electromagnetic compatibility – Requirements for household appliances,
electric tools and similar apparatus – Part 1: Emission
CISPR 16-1-1:2015, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
– 8 – IEC 62041:2017 © IEC 2017
CISPR 16-1-2:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Coupling
devices for conducted disturbance measurements
CISPR 16-1-4:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Antennas
and test sites for radiated disturbance measurements
CISPR 16-1-4:2010/AMD1:2012
CISPR 16-2-1:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
CISPR 16-2-3:2016, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-4-2, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 4-2: Uncertainties, statistics and limit modelling – Measurement
instrumentation uncertainty
CISPR 32:2015, Electromagnetic compatibility of multimedia equipment – Emission
requirements
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
equipment under test
transformers, reactors and power supply units where applicable
3.1.2
port
particular interface of the specified EUT with the external electromagnetic environment.
Note 1 to entry: Examples of ports of interest are shown in Figure 1. The enclosure port is the physical boundary
of the equipment (e.g. enclosure). The enclosure port provides for radiated and electrostatic discharge (ESD)
energy transfer, whereas the other ports provide for conducted energy transfer, either by direct injection or by
induction.
Note 2 to entry: In some cases, different ports may be combined.

Enclosure port
Signal port AC power port
EUT
DC power port
IEC
Figure 1 – Ports covered by Table A.1 to Table A.16
3.1.3
enclosure port
physical boundary of the EUT which electromagnetic fields may radiate through or impinge on
3.1.4
cable port
port at which a conductor or a cable is connected to the EUT
Note 1 to entry: Examples are signal, control and power ports.
3.1.5
signal port
port at which a conductor or cable intended to carry signals is connected to the EUT
Note 1 to entry: Examples are analogue inputs, outputs and control lines, data busses, communication networks,
etc.
3.1.6
power port
port at which a conductor or cable carrying the primary electrical power needed for the
operation (functioning) of an EUT is connected
3.1.7
public mains network
electricity lines to which all categories of consumers have access and which are operated by
a supply or distribution undertaking for the purpose of supplying electrical energy
3.1.8
low voltage
voltage having a value below a conventionally adopted limit
Note 1 to entry: For the distribution of AC electric power, the upper limit is generally accepted to be 1 000 V.
[SOURCE: IEC 60050-151:2001, 151-15-03]
3.2 Abbreviations
AC Alternating Current
AM Amplitude Modulation
DC Direct Current
EUT Equipment Under Test
FAR Fully Anechoic Room
ISN Impedance Stabilization Network
LV Low Voltage
OATS Open Area Test Site
– 10 – IEC 62041:2017 © IEC 2017
SAC Semi Anechoic Chamber
TEM Transverse Electromagnetic Mode
4 General considerations
4.1 Categories
EUT are classified according to the incorporation of components and electronic circuits as
follows:
• category 0: EUT with or without passive protection components and without electronic
circuits,
• category 1: EUT with passive components, and without electronic circuits,
• category 2: EUT with electronic circuits.
NOTE 1 Examples of passive protection components are fuses, thermal links, thermal cut-outs, circuit-breakers,
PTC’s, NTC’s and resistors.
NOTE 2 Examples of passive components are capacitors, inductors, diodes, LED’s, relays, VDR’s.
NOTE 3 Examples of electronic circuits are active semiconductors.
4.2 Measurement uncertainty
Compliance testing with the limits described in this document shall be carried out statistically
according to Table 1. Emission tests shall be executed in accordance with Annex A by using
at least 5 samples. In case of exceptional conditions, the sum of test samples can be reduced
to 3 or 4 samples.
The requirements are fulfilled, if the measured emissions of all individual samples are in
compliance with the limits and the gap to the limit is not smaller than specified in Table 1.
Table 1 – Additional acceptance limit for statistical determination
Sample size 3 4 5 6
Additional acceptance limit (dB) 3,8 2,5 1,5 0,7

This procedure shall not be used to show the non-compliance of the product.
NOTE This procedure is based on CISPR TR 16-4-3.
Compliance is constituted by
x + k × σ < L
max E max
where
x is the highest (unfavourable) value of all samples of the sample size;
max
k is the coefficient taken from the Table 2 in view of sample size;
E
σ is the conservative standard regression of product group;
max
L is the permissible limit.
Table 2 – Values of k according to CISPR TR
E
16-4-3:2004, Table C.1
Sample size 3 4 5 6
Coefficient k 0,63 0,4 0,24 0,12
E
IEC/CISPR/TR 16-4-3 recommends σ = 6 dB for conducted emissions. For radiated
max
emissions the same value of σ can be used. Values shown in Table 1 constitute a simple
max
multiplication of k and σ = 6 dB.
E max
Table 1 is only valid for sample sizes up to 6. If more samples are used to check compliance,
a different procedure may be used (binominal distribution without additional gap to the limit).
4.3 Routine tests (production tests)
The assessment of compliance with the requirements of this document shall be carried out by
normative tests. The uncertainty of measurement shall be taken into account.
Wherever possible, the measurement uncertainty shall be covered in accordance with
CISPR 16-4-2.
NOTE 1 Measurements conducted at the place of installation, the share of place is not taken into account.
Measurements carried out at distances smaller than 10 m, higher uncertainty may need to be
used.
Table 3 – Uncertainties for emission tests
Test Uncertainty
dB
a
Conducted emissions (150 kHz to 30 MHz) using a 50Ω/50µH ISN 3,44
b
Radiated emissions (30 MHz to 200 MHz) – Horizontal polarisation – 10 m 5,05
b
Radiated emissions (30 MHz to 200 MHz) – Vertical polarisation – 10 m 5,03
c
Radiated emissions (200 MHz to 1 GHz) – Horizontal polarisation – 10 m 5,21
c
Radiated emissions (200 MHz to 1 GHz) – Vertical polarisation – 10 m 5,22
a
Impedance stabilisation network (ISN).
b
Uncertainty for the use of biconical antennas.
c
Uncertainty for the use of logarithmical-periodical antennas.

5 Product documentation
The user documentation and/or manual shall contain details of any special measures required
to be taken by the purchaser or user to ensure the EMC compliance of the EUT with the
requirements of this publication. One example would be the need to use shielded or special
cables.
6 Applicability
The application of tests for evaluation of immunity depends on the particular apparatus, its
configuration, its ports, its technology and its operating conditions.

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Tests shall be applied to the relevant ports of the EUT according to Table A.1 to Table A.16.
Tests shall only be carried out where the relevant ports exist.
It may be determined from consideration of the electrical characteristics and usage of a
particular EUT that some of the tests are inappropriate and therefore unnecessary. In such a
case, it is required that the decision and justification not to test shall be recorded in the test
report.
7 Test equipment
The description of the measurement, the measurement instrumentation, the measurement
methods and the measurement set up to be used is given in Tables A.1 to A.16.
8 Conditions during testing
If the apparatus is part of a system, or can be connected to auxiliary apparatus, the apparatus
shall be tested while connected to the minimum representative configuration of auxiliary
apparatus necessary to exercise the ports in a similar manner to that described in CISPR 32.
In cases where manufacturer´s specification requires external filtering and/or shielding
devices or measures that are clearly specified in the user´s manual, the measurement
requirements of this document shall be applied with the specified devices or measures in
place.
The configuration and mode of operation during the measurements shall be precisely noted in
the test report. If the apparatus has a large number of similar ports or ports with many similar
connections, a sufficient number shall be selected to simulate actual operating conditions and
to ensure that all different types of determination are covered.
The measurements shall be carried out at one single set of parameters within the operating
ranges of temperature, humidity and atmospheric pressure specified for the product and at the
rated supply voltage, unless otherwise indicated in the basic standard.
Where applicable, additional information on EUT configuration can be found in CISPR 16-2
(all parts) and CISPR 32.
9 Measurement procedures
9.1 Emission
The equipment under test (EUT) shall be tested in the operating mode producing the largest
emission in the frequency band being investigated, e.g. based on limited pre-tests and
consistent with normal applications. The configuration of the test sample shall be varied to
achieve maximum emission consistent with typical applications and installation practice.
The emission requirements for EUT covered by this document are given on a port by port
basis. These requirements are stated in Tables A.9 to A.16.
Measurements shall be conducted in a well-defined and reproducible manner. The
measurements may be performed in any order.
9.2 Immunity
The equipment under test (EUT) shall be tested in the expected most susceptible operating
mode e.g. identified by performing limited pre-tests. This mode shall be consistent with

normal applications. The configuration of the test sample shall be varied to archive maximum
susceptibility with typical applications and installation practice.
The immunity test requirements for EUT covered by this document are given on a port by
port basis.
Tests shall be conducted in a well-defined and reproducible manner.
The tests shall be carried out individually as single tests in sequence. The tests may be
performed in any order. If requirements are in conflict the most severe takes precedence.
The description of the test, relevant generator, appropriate methods, and the set up to be
used are given in basic standards, which are referred to in Tables A.1 to A.8.
The contents of these basic standards are not repeated here, however modifications or
additional information and test levels needed for the practical application of the tests are
given in this document.
10 Performance criteria
The variety and the diversity of the EUT within the scope of this document makes it difficult to
define precise criteria for the evaluation of the immunity test results.
If, as a result of the application of the tests defined in this document, the apparatus becomes
dangerous or unsafe, the apparatus shall be deemed to have failed the test.
A functional description and a definition of performance criteria, during or as a consequence
of the EMC testing, shall be provided by the manufacturer and noted in the test report, based
on one of the following criteria for each test as specified in Tables A.1 to A.8.
Performance criterion A: The EUT shall continue to operate as intended during and after the
test. No degradation of performance or loss of function is allowed below a performance level
specified by the manufacturer, when the EUT is used as intended. The performance level may
be replaced by a permissible loss of performance. If the minimum performance level or the
permissible performance loss is not specified by the manufacturer, either of these may be
derived from the product description and documentation and what the user may reasonably
expect from the EUT if used as intended.
Performance criterion B: The EUT shall continue to operate as intended after the test. No
degradation of performance or loss of function is allowed below a performance level specified
by the manufacturer, when the EUT is used as intended. The performance level may be
replaced by a permissible loss of performance. During the test, degradation of performance is
however allowed. No change of actual operating state or stored data is allowed. If the
minimum performance level or the permissible performance loss is not specified by the
manufacturer, either of these may be derived from the product description and documentation
and what the user may reasonably expect from the EUT if used as intended.
Performance criterion C: Temporary loss of function is allowed, provided the function is self-
recoverable or can be restored by the operation of the controls.

– 14 – IEC 62041:2017 © IEC 2017
11 Requirements
11.1 Immunity
The immunity requirements applicable to equipment covered within the scope of this
publication shall be selected from Tables A.1 to A.8 as specified below. Where requirements
are different the most severe takes precedence.
All EUT directly powered by the AC network shall meet the requirements of Table A.7, table
clauses 7.2 and 7.3, for current less than 16 A per phase and Table A.8, table clauses 8.2
and 8.3, for current more than 16 A per phase as regards voltage dips and interruptions of the
mains supply caused generally by faults on the network.
Category 0 EUT are not sensitive to normal electromagnetic perturbations. Consequently,
they are deemed to fulfil the immunity requirements without testing.
Category 1 EUT shall fulfil the immunity requirements for electrostatic discharges, electrical
fast transients and surges as follows:
• for electrostatic discharge, refer to Table A.1 and Table A.2, as applicable;
NOTE 1 Some passive components such as small capacitors (e.g. Y-type), diodes, LEDs or relays can be
sensitive to electrostatic discharges.
• for electrical fast transient/burst, refer to Table A.3, Table A.4, Table A.5, Table A.6, Table
A.7 and Table A.8, as applicable;
NOTE 2 Some passive components such as small capacitors (e.g. Y-type), diodes, LEDs, or relays can be
sensitive to electrical fast transients.
• for surge, refer to Table A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable.
NOTE 3 Some passive components such as small capacitors (e.g. Y-type), diodes, LED or relays can be
sensitive to surges.
Category 2 EUT shall fulfil the immunity requirements for electrostatic discharges, electrical
fast transients, surges, conducted radio-frequency disturbances, radiated radio-frequency
disturbances and for voltage dips and interruptions as follows:
• for electrostatic discharge, refer to Table A.1 and Table A.2, as applicable;
• for electrical fast transient/burst, refer to Table A.3, Table A.4, Table A.5, Table A.6, Table
A.7 and Table A.8, as applicable;
• for surge, refer to Table A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable;
• for conducted disturbances, inducted by radio-frequency fields, refer to Table A.3, Table
A.4, Table A.5, Table A.6, Table A.7 and Table A.8, as applicable;
• for radiated, radio-frequency electromagnetic fields, refer to Table A.1 and Table A.2, as
applicable;
• for voltage dips and short interruptions, refer to Table A.7 and Table A.8, as applicable.
The necessity to conduct some of the tests may be determined in accordance with the
electrical characteristics and the specific application of the particular transformer. In such
cases the rationale for not conducting the tests shall be stated in the test report.
11.2 Emission
The emission requirements for equipment covered within the scope of this publication shall be
selected from Tables A.9 to A.16 as specified below. Where requirements are different the
most severe takes precedence.
EUT according to Category 0 as defined in 4.1 having a working voltage not exceeding 700 V
do not generate electromagnetic interferences with a considerable level and as a
consequence are deemed to fulfil the emission requirements without testing.
EUT according to Category 0 as defined in 4.1 having a working voltage exceeding 700 V are
considered to generate electromagnetic interference. Consequently, the following
requirements in accordance with CISPR 32 and CISPR 14-1 shall be carried out:
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.
Category 1 EUT having a working voltage not exceeding 700 V shall fulfil the following
requirements given in IEC 61000-3-2, IEC 61000-3-3, IEC 61000-3-11, IEC 61000-3-12,
CISPR 32, and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable.
Category 1 EUT having a working voltage exceeding 700 V shall fulfil the following
requirements given in IEC 61000-3-2, IEC 61000-3-3, IEC 61000-3-11, IEC 61000-3-12,
CISPR 32 and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.
Category 2 EUT shall fulfil the following requirements given in IEC 61000-3-2, IEC 61000-3-3,
IEC 61000-3-11, IEC 61000-3-12, CISPR 32 and CISPR 14-1:
• for harmonics and flicker, refer to Table A.11;
• for conducted radio disturbances, refer to Table A.15 and Table A.16, as applicable;
• for radiated radio disturbances, refer to Table A.9 and Table A.10, as applicable.

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Annex A
(informative)
Tables for immunity and emission limits
This Annex contains tables defining requirements to be selected i
...