IEC 62135-2:2020

Resistance welding equipment - Part 2: Electromagnetic compatibility (EMC) requirements

IEC 62135-2:2020 is applicable to equipment for resistance welding and allied processes which are connected to mains supplies with rated voltages up to 1 000 V AC RMS. This document does not define safety requirements. This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- update of the applicable limits related to the updated references;
- implementation of radiated magnetic field requirements.

Matériels de soudage par résistance - Partie 2: Exigences de compatibilité électromagnétique (CEM)

L’IEC 62135-2:2020 est applicable aux matériels de soudage par résistance et procédés connexes qui sont connectés aux réseaux d’alimentation avec des tensions assignées jusqu’à 1 000 V efficace en courant alternatif. Le présent document ne définit pas d’exigences de sécurité. Cette troisième édition annule et remplace la deuxième édition parue en 2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour des limites applicables conformément aux références mises à jour;
- mise en œuvre des exigences du champ magnétique rayonné.

General Information

• Status: Published
• Publication Date: 29-Mar-2020
• ICS: 25.160.30 - Welding equipment
• Technical Committee: TC 26 - Electric welding
• Drafting Committee: WG 5 - TC 26/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 30-Mar-2020
• Completion Date: 17-Apr-2020

Relations

• Revises: IEC 62135-2:2015 - Resistance welding equipment - Part 2: Electromagnetic compatibility (EMC) requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62135-2 ®
Edition 3.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resistance welding equipment –
Part 2: Electromagnetic compatibility (EMC) requirements

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
IEC 62135-2 ®
Edition 3.0 2020-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Resistance welding equipment –

Part 2: Electromagnetic compatibility (EMC) requirements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.160.30 ISBN 978-2-8322-8113-0

– 2 – IEC 62135-2:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 General test requirements . 11
4.1 Test conditions . 11
4.2 Measuring instruments . 11
4.3 Artificial mains network . 11
4.4 Voltage probe . 11
4.5 Antennas . 11
5 Test set-up for emission and immunity . 12
5.1 General requirements . 12
5.2 Ancillary equipment . 13
6 Emission tests . 13
6.1 Classification of equipment . 13
6.1.1 Class A equipment . 13
6.1.2 Class B equipment . 13
6.2 Test conditions . 13
6.2.1 Test conditions for RF tests . 13
6.2.2 Test conditions for low-frequency tests . 14
6.3 Emission limits . 14
6.3.1 Mains terminal disturbance voltage . 14
6.3.2 Electromagnetic radiation disturbance . 16
6.3.3 Low-frequency emission limits . 19
6.3.4 Conducted emissions at signal, control and measurement ports . 20
7 Immunity tests . 20
7.1 Tests applicability . 20
7.2 Test conditions . 20
7.3 Immunity performance criteria . 20
7.3.1 Performance criteria A . 20
7.3.2 Performance criteria B . 21
7.3.3 Performance criteria C . 21
7.4 Immunity levels . 21
8 Documentation for the purchaser/user . 23
Annex A (informative) Limits . 25
A.1 General . 25
A.2 Mains terminal disturbance voltage limits . 25
A.3 Electromagnetic radiation disturbance limits . 26
A.4 Harmonic current limits .
A.5 Limits for voltage fluctuations and flicker .
Annex B (informative) Symbols . 31
Annex C (normative) Battery powered equipment . 32
C.1 General . 32
C.2 Additional emission requirements . 32
C.3 Additional immunity requirements . 32

Annex D (normative) Equipment containing radio devices . 33
D.1 General . 33
D.2 Additional emission requirements . 33
D.3 Additional immunity requirements . 33
Bibliography . 34

Figure 1 – Examples of ports . 10
Figure 2 – Test position for H field measurement . 12

Table 1 – Disturbance voltage limits – Idle state . 15
Table 2 – Disturbance voltage limits for Class A equipment – Loaded state . 16
Table 3 – Electromagnetic radiation disturbance limits – Idle state . 17
Table 4 – Electromagnetic radiation disturbance limits for Class A equipment – Loaded
state . 18
Table 5 – Electric field radiation disturbance limits for Class B equipment – Loaded
state . 18
Table 6 – Magnetic field radiation disturbance limits for Class B equipment – Loaded
state . 19
Table 7 – In-situ electromagnetic radiation disturbance limits for Class A equipment –
Loaded state . 19
Table 8 – Immunity levels – Enclosure . 22
Table 9 – Immunity levels – AC input power port . 22
Table 10 – Immunity levels – Ports for measurement and control . 23
Table A.1 – Mains terminal disturbance voltage limits, idle state .
Table A.2 – Mains terminal disturbance voltage limits, load conditions .
Table A.3 – Electromagnetic radiation disturbance limits, idle state .
Table A.4 – Electromagnetic radiation disturbance limits, load conditions .
Table A.5 – Magnetic field emission limits for Class B equipment .
Table A.6 – Maximum permissible harmonic current for equipment with input current
I ≤ 16 A .
1cc
Table A.7 – Current emission limits for equipment with 16 A < I ≤ 75 A other than
1cc
balanced three-phase equipment .
Table A.8 – Current emission limits for balanced three-phase equipment with input
current 16 A < I ≤ 75 A .
1cc
Table A.9 – Current emission limits for balanced three-phase equipment with input
current 16 A < I ≤ 75 A under specified conditions .
1cc
Table A.10 – Current emission limits for balanced three-phase equipment with I ≤
1cc
75 A under specified conditions (d, e, f) .
Table A.11 – Limits for resistance welding equipment I ≤ 75 A .
1cc
Table B.1 – Symbols to describe EMC properties . 31

– 4 – IEC 62135-2:2020 RLV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESISTANCE WELDING EQUIPMENT –

Part 2: Electromagnetic compatibility (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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

International Standard IEC 62135-2 has been prepared by IEC technical committee 26:
Electric welding.
This third edition cancels and replaces the second edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of the applicable limits related to the updated references;
b) implementation of radiated magnetic field requirements.
The text of this standard is based on the following documents:
FDIS Report on voting
26/696/FDIS 26/698/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62135 series, under the general title Resistance welding
equipment, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
– 6 – IEC 62135-2:2020 RLV © IEC 2020
RESISTANCE WELDING EQUIPMENT –

Part 2: Electromagnetic compatibility (EMC) requirements

1 Scope
This part of IEC 62135 is applicable to equipment for resistance welding and allied processes
which are connected to mains supplies with rated voltages up to 1 000 V AC RMS. This
document does not define safety requirements.
Resistance welding equipment type tested in accordance with, and which has met the
requirements of, this document, is deemed to be in compliance for all applications.
The frequency range covered is from 0 Hz to 400 GHz.
Arc welding equipment containing a radio receiver or transmitter is within the scope of this
document. Additional requirements for such equipment is specified in Annex D.
The radiated emission requirements in this document are not intended to be applicable to the
intentional transmissions from a radio transmitter as defined by the ITU nor to any spurious
emissions related to these intentional transmitters.
This product EMC standard for resistance welding equipment takes precedence over all
aspects of the generic standards and no additional EMC tests are required or necessary.
NOTE 1 Typical allied processes are resistance hard and soft soldering or resistance heating achieved by means
comparable to resistance welding equipment.
NOTE 2 Limit values are specified for only part of the frequency range.
Resistance welding equipment are classified as Class A and Class B equipment.
This part of IEC 62135 specifies
a) test methods to be used in conjunction with CISPR 11:2015, CISPR 11:2015/AMD1:2016
and CISPR 11:2015/AMD2:2019 to determine radio-frequency (RF) emission;
b) relevant standards and test methods for harmonic current emission, voltage fluctuation
and flicker;
c) additional requirements for equipment powered by internal or external batteries (Annex C).
NOTE 3 The limits in this document cannot, however, provide full protection against interference to radio and
television reception when the resistance welding equipment is used closer than 30 m to the receiving antenna(e).
NOTE 4 In special cases, when highly susceptible apparatus is being used in close proximity, additional
mitigation measures are sometimes employed to further reduce the electromagnetic emissions.
NOTE 5 The origins of the limit values in this document are summarized in Annex A.
This part of IEC 62135 also defines immunity requirements and test methods for continuous
and transient, conducted and radiated disturbances including electrostatic discharges.
NOTE 6 These requirements do not, however, cover extreme cases which are extremely rare.

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 60050-851, International Electrotechnical Vocabulary – Part 851: Electric welding
IEC 61000-3-2:20142018, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
IEC 61000-3-3:2013, 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 61000-3-3:2013/AMD1:2017
IEC 61000-3-11:20002017, Electromagnetic compatibility (EMC) – Part 3-11: Limits –
Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply
≤ 75 A and subject to conditional connection
systems – Equipment with rated current
IEC 61000-3-12:2011, Electromagnetic compatibility (EMC) – Part 3-12: Limits for harmonic
currents produced by equipment connected to public low-voltage systems with input current >
≤ 75 A per phase
16 A and
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3 : Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-5:2014/AMD1:2017
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
IEC 61000-4-11:2004/AMD1:2017
IEC 61000-4-34:2005, 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 61000-4-34:2005/AMD1:2009
– 8 – IEC 62135-2:2020 RLV © IEC 2020
IEC 61000-6-1:2016, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity standard for residential, commercial and light-industrial environments
IEC 61000-6-2:2016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standard for industrial environments
IEC 61000-6-3:2006, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61000-6-3:2006/AMD1:2010
IEC 61000-6-4:2018, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 62135-1:2015, Resistance welding equipment – Part 1: Safety requirements for design,
manufacture and installation
ISO 669:2016, Resistance welding – Resistance welding equipment – Mechanical and
electrical requirements
CISPR 11:20092015, Industrial, scientific and medical equipment – Radio-frequency
disturbance characteristics – Limits and methods of measurement
CISPR 11:2009/AMD 1:2010
CISPR 11:2015/AMD1:2016
CISPR 11:2015/AMD2:2019
CISPR 16-1-1:2019, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
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 16-1-2:2014/AMD1:2017
CISPR 16-1-4:2019, 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
ISO 669, Resistance welding – Resistance welding equipment – Mechanical and electrical
requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161
concerning EMC and the relevant phenomena, given IEC 60050-851, IEC 62135-1 and
ISO 669 on resistance welding equipment, as well as the following, apply.
For the purposes of this document, the following terms and definitions 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
cable port
point at which a conductor or a cable is connected to the apparatus
Note 1 to entry: Examples are signal, control and power ports.
Note 2 to entry: The welding circuit of resistance welding equipment is not a cable port but is part of the
enclosure port.
3.2
conventional load
load condition with the electrodes short-circuiting as defined in ISO 669
3.3
conventional value
standardized value that is used as a measure of a parameter for the purposes of comparison,
calibration, testing, etc.
Note 1 to entry: Conventional values do not necessarily apply during the actual welding process.
3.2
click
disturbance which exceeds the limit of continuous disturbance no longer than 200 ms and
which is separated from a subsequent disturbance by at least 200 ms
Note 1 to entry: Both intervals are related to the level of the limit of continuous disturbance.
Note 2 to entry: A click may contain a number of impulses, in which case the relevant time is that from the
beginning of the first to the end of the last impulse.
[SOURCE: IEC 60050-851:2008, 851-15-13]
3.3
enclosure port
physical boundary of the apparatus through which electromagnetic fields may radiate or
impinge
3.4
FAR
fully-anechoic chamber
shielded enclosure, the internal surfaces of which are lined with radio-frequency-energy
absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the frequency
range of interest
[SOURCE: CISPR 11:2015/AMD1:2016, 3.20]
3.5
EUT
equipment under test
3.5
idle state
operating mode state in which the power is switched on, but and the welding circuit is not
energized
Note 1 to entry: For some types of equipment there is no idle state.
Note 2 to entry: For a power source in a mechanized system, the configuration to achieve idle state is defined by
the manufacturer.
Note 3 to entry: An idle state can include a low energy state in which a welding process cannot be started without
automatic or manual reactivation.

– 10 – IEC 62135-2:2020 RLV © IEC 2020
3.6
OATS
open-area test site
facility used for measurements of electromagnetic fields the intention for which is to simulate
a semi-free-space environment over a specified frequency range that is used for radiated
emission testing of products
Note 1 to entry: An OATS typically is located outdoors in an open area, and has an electrically-conducting ground
plane.
[SOURCE: CISPR 11:2015/AMD1:2016, 3.21]
3.7
port
particular interface of the specified apparatus with the external electro-magnetic environment
particular interface of an equipment which couples this equipment with the external
electromagnetic environment (IEC 60050-161:2018, 161-01-01) and through which the
equipment is influenced by this environment
EXAMPLE Examples of ports of interest are shown in Figure 1. The enclosure port is the physical boundary of the
apparatus (e.g. enclosure). The enclosure port provides for radiated and electrostatic discharge (IEC 60050-
161:2018, 161-01-22) energy transfer, whereas the other ports provide for conducted energy transfer.

Figure 1 – Examples of ports
Note 1 to entry: Ports in the subject area of electromagnetic compatibility are specific cases of the port defined in
IEC 60050-131:2002, 131-12-60.
[SOURCE: IEC Guide 107:2009, 3.1.12, modified – The presentation of the term and the
wording of the definition have been revised for compatibility with IEC 60050 (all parts).]
3.8
SAC
semi-anechoic chamber
shielded enclosure, in which five of the six internal surfaces are lined with radio-frequency
energy absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the
frequency range of interest, and the bottom horizontal surface is a conducting ground plane
for use with OATS test set-ups
[SOURCE: CISPR 11:2015/AMD1:2016, 3.22]
3.9
small equipment
equipment, either positioned on a table top or standing on the floor which, including its cables
fits in an imaginary cylindrical test volume of 1,2 m in diameter and 1,5 m above the height (to
ground plane)
[SOURCE: CISPR 11:2009/AMD1:2010, 3.10]
[SOURCE: CISPR 11:2015, 3.17, modified – Replacement of the term "small size equipment"
by "small equipment".]
3.10
wired network port
port for the connection of voice, data and signalling transfers intended to interconnect widely-
dispersed systems by direct connection to a single-user or multi-user communication network
Note 1 to entry: Examples of these include CATV, PSTN, ISDN, xDSL, LAN and similar networks.
Note 2 to entry: These ports may support screened or unscreened cables and may also carry AC or DC power
where this is an integral part of the telecommunication specification.
[SOURCE: CISPR 32:2015, 3.1.32]
4 General test requirements
4.1 Test conditions
Tests shall be carried out on completely assembled equipment representative of the series
production. Tests shall be performed within the specified operating conditions for the
apparatus at its rated supply voltage and frequency as given in IEC 62135-1:2015. Results
obtained for RF emission and immunity at 50 Hz are valid for the same model operating at
60 Hz and vice versa.
4.2 Measuring instruments
The measuring equipment shall comply with the requirements of CISPR 16-1-1:2019 and the
standards referred to in Table 8, Table 9 and Table 10 as applicable.
4.3 Artificial mains network
Measurement of the mains terminal disturbance voltage shall be made using an artificial
mains network, if commercially available, consisting of 50 Ω/50 µH or a 50 Ω/50 µH + 5 Ω V-
network as specified in CISPR 16-1-2:2014 and CISPR 16-1-2:2014/AMD1:2017.
The artificial network is required to provide a defined impedance at RF across the mains
supply at the point of measurement and also to provide for isolation of the equipment under
test from ambient noise on the power lines.
4.4 Voltage probe
A voltage probe as specified in CISPR 16-1-2:2014 and CISPR 16-1-2:2014/AMD1:2017 shall
be used when the artificial mains network cannot be used. The probe is connected
sequentially between each line and the reference earth. The probe shall consist of a blocking
capacitor and a resistor such that the total resistance between the line and earth is at least
1 500 Ω. The effect on the accuracy of measurement of the capacitor or any other device
which may be used to protect the measuring receiver against dangerous currents shall be
either less than 1 dB or allowed for in calibration.
4.5 Antennas
In the frequency range below 30 MHz the antenna shall be a loop as specified in
CISPR 16-1-4:2019.
In the frequency range from 30 MHz to 1 GHz the antenna(s) used shall be as specified in
CISPR 16-1-4:2019. Measurements shall be made for both horizontal and vertical polarization.
The nearest point of the antenna(s) to the ground shall be not less than 0,2 m.

– 12 – IEC 62135-2:2020 RLV © IEC 2020
5 Test set-up for emission and immunity
5.1 General requirements
Emission and immunity testing shall be carried out on a representative resistance welding
installation as described below. Resistance welding equipment tested in such an installation
shall be considered to have met the necessary requirements of this document.
In any situation where it is necessary to re-test the equipment to show compliance with this
standard the test setup originally chosen shall be used in order to guarantee consistency of
the results, unless it is agreed by the manufacturer to do otherwise.
If the resistance welding equipment is part of an installation, or can be connected to auxiliary
equipment, then the resistance welding equipment shall be tested whilst connected to the
minimum configuration of auxiliary equipment necessary to exercise the ports. If the
resistance welding equipment has a large number of similar ports or ports with many similar
connections, then a sufficient number shall be selected to simulate actual operating
conditions and to ensure that all the different types of termination are covered.
Measurements to determine compliance with the low-frequency emission limits shall be made
in accordance with the test procedures of relevant basic and referenced standards.
For electromagnetic radiation disturbance tests the separation between the antenna and the
equipment under test shall be as specified in Clause 6 of CISPR 11:20092015, CISPR
11:2015/AMD1:2016 and CISPR 11:2015/AMD2:2019.
For radiated emission test in the frequency range between 150 kHz and 1 MHz, the antenna
shall be positioned on the axis z, as given in Figure 2, perpendicular to the plane x, y of the
welding circuit.
Figure 2 – Test position for H field measurement
Specific test set-up geometries for immunity tests are found in the basic standards referred to
in Table 8, Table 9 and Table 10.
Class A resistance welding equipment may be measured either on a test site or in situ as
preferred by the manufacturer.
NOTE 1 Due to size, complexity or operating conditions, some resistance welding equipment are sometimes
measured in situ in order to show compliance with the radiation disturbance limits specified herein.
NOTE 2 By their nature, in situ tests are not adequate for type testing purposes.

Class B resistance welding equipment shall be measured on a test site.
The configuration of the resistance welding equipment under test shall be precisely noted in
the test report.
5.2 Ancillary equipment
Ancillary equipment shall be tested in conjunction with the resistance welding equipment. It
shall be connected, installed, configured and operated as recommended by the manufacturer.
6 Emission tests
6.1 Classification of equipment
6.1.1 Class A equipment
Class A equipment is intended for use in locations other than residential locations where the
electrical power is provided by the public low-voltage supply system.
Class A equipment is equipment suitable for use in all locations other than those allocated in
residential environments and those directly connected to a low voltage power supply network
which supplies buildings used for domestic purposes.
NOTE This definition originates from CISPR 11:2015, 5.2.
Class A equipment shall meet class A limits in accordance with 6.3.
6.1.2 Class B equipment
Class B equipment is suitable for use in all locations, including residential locations where the
electrical power is provided by the public low-voltage supply system.
Class B equipment is equipment suitable for use in residential environments and in
establishments directly connected to a low voltage power supply network which supplies
buildings used for domestic purposes.
NOTE This definition originates from CISPR 11:2015, 5.2.
Class B equipment shall meet Class B limits in accordance with 6.3.
6.2 Test conditions
6.2.1 Test conditions for RF tests
Measurements to determine compliance with the emission limits shall be made in accordance
with the test procedures in CISPR 11:2015, CISPR 11:2015/AMD1:2016 and CISPR
11:2015/AMD2:2019 and as detailed below, using the test set-up given in Clause 5.
Resistance welding equipment is extremely diverse in its design and working conditions. It
shall be tested under the following conditions:
a) idle state
b) loaded
– set up the welding circuit to minimize the impedance and to produce the highest flow of
current (i.e., using minimum arms length and gap);
– set up the electrodes in short-circuit condition according to ISO 669:2016;
– adjust the current to obtain the highest emission, if means of adjustment are provided;

– 14 – IEC 62135-2:2020 RLV © IEC 2020
NOTE For thyristor-controlled equipment, an ignition delay angle of 90° typically gives the highest
emission value.
– select a duty cycle and a welding heat time appropriate for the tested resistance
welding equipment and the requirements of the measuring instrumentation.
The test parameters chosen shall be fully documented.
6.2.2 Test conditions for low-frequency tests
Resistance welding equipment is extremely diverse in its design and working conditions. It
shall be tested under the following conditions:
– set up the welding circuit to minimize the impedance and to produce the highest flow of
current;
– set up the electrodes in short-circuit condition according to ISO 669:2016;
– adjust the current to obtain the highest emission, if means of adjustment are provided;
– calculate the equipment duty cycle X at the maximum welding current based on Formula (1)
and
I
( )
2P
(1)
X =
I
( )
2cc
where
I is the permanent output current;
2P
I is the maximum short circuit welding current;
2cc
– select an observation period and a welding heat time appropriate for the calculated duty
cycle, the tested resistance welding equipment and the requirements of the measuring
instrumentation.
The test parameters chosen shall be fully documented.
The arithmetic average value of 1,5 s smoothed RMS supply current values (I as per
ref
IEC 61000-3-12:2011) shall be measured when the welding equipment is delivering its
maximum rated output current I .
2cc
For welding equipment with a rated maximum supply current I below 16 A, the reference
1cc
current I for the definition of limits shall be 16 A.
ref
The maximum and arithmetic average values of 1,5 s smoothed RMS harmonic current values
in each discrete Fourier transform (DFT) time window shall be determined over one or more
full thermal cycle(s) including the idle state period.
The same welding heat time shall be used for the determination of I and the harmonic
ref
component values.
NOTE An idle state period of more than 10 % is not a stand-by mode as defined in IEC 61000-3-12:2011, but an
operational mode of the welding equipment within its full thermal cycle.
6.3 Emission limits
6.3.1 Mains terminal disturbance voltage
6.3.1.1 Idle state
The mains terminal disturbance voltage limits for class A resistance welding equipment in idle
state, regardless of the rated input power, are given in Table 2 of CISPR 11:2009 in the
column for a rated input power less than or equal to 20 kVA.

The mains terminal disturbance voltage limits for class B resistance welding equipment in idle
state are given in Table 3 of CISPR 11:2009.
The mains terminal disturbance voltage limits for Class A and Class B resistance welding
equipment in idle state are given in Table 1. The appropriate set of limits shall be selected in
accordance with the maximum rated input power of the equipment, calculated using the rated
.
maximum input current I
1cc
Table 1 – Disturbance voltage limits – Idle state
Class A Class A Class A
Class B maximum rated input maximum rated input maximum rated input
Frequency
a b
power ≤ 20 kVA power > 20 kVA power > 75 kVA
range
dBµV
dBµV dBµV dBµV
MHz
Quasi-peak Average Quasi-peak Average Quasi-peak Average Quasi-peak Average
66 56
Decreasing linearly with
0,15 to 0,50 79 66 100 90 130 120
logarithm of frequency to
56 46
0,50 to 5 56 46 73 60 86 76 125 115
90 80
Decreasing linearly
with
5 to 30 60 50 73 60 115 105
logarithm of frequency
to
73 60
At the transition frequency, the more stringent limit shall apply.
a
These limits apply to equipment with a rated power > 20 kVA and intended to be connected to a dedicated
power transformer or generator, and which is not connected to low voltage (LV) overhead power lines. For
equipment not intended to be connected to a user specific power transformer the limits for ≤ 20 kV A apply. The
manufacturer, and/or supplier shall provide information on installation measures that can be used to reduce
emissions from the installed equipment. In particular it shall be indicated that this equipment is intended to be
connected to a dedicated power transformer or generator and not to LV overhead power lines.
b
These limits apply only to high power electronic systems and equipment with a rated power greater than 75 kVA
when intended to be installed as follows:
– the installation is supplied from a dedicated power transformer or generator, and which is not connected to
low voltage (LV) overhead power lines,
– the installation is physically separated from residential environments by a distance greater than 30 m or by
a structure which acts as a barrier to radiated phenomena,
– the manufacturer and/or supplier shall indicate that this equipment meets the disturbance voltage limits for
high power electronic systems and equipment of rated input power > 75 kVA and provide information on
installation measures to be applied by the installer. In particular, it shall be indicated that this equipment is
intended to be used in an installation which is powered by a dedicated power transformer or generator and
not by LV overhead power lines.

NOTE Values are based on the limits for group 1 equipment in CISPR 11:2015, CISPR 11:2015/AMD1:2016 and
CISPR 11:2015/AMD2:2019.
The equipment under test (EUT) shall meet either both average and quasi-peak limits using
the corresponding detectors or the average limit when using the quasi-peak detector.
6.3.1.2 Loaded
The mains terminal disturbance voltage limits for Class A and Class B resistance welding
equipment are the group 2 limits given in Table 6 of CISPR 11:2009 Table 2. The appropriate
set of limits shall be selected in accordance with the maximum rated input power of the
equipment, calculated using the rated maximum input current I .
1cc
...

IEC 62135-2 ®
Edition 3.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resistance welding equipment –
Part 2: Electromagnetic compatibility (EMC) requirements

Matériels de soudage par résistance –
Partie 2: Exigences de compatibilité électromagnétique (CEM)

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 62135-2 ®
Edition 3.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Resistance welding equipment –

Part 2: Electromagnetic compatibility (EMC) requirements

Matériels de soudage par résistance –

Partie 2: Exigences de compatibilité électromagnétique (CEM)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-8028-7

– 2 – IEC 62135-2:2020 © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 8
4 General test requirements . 10
4.1 Test conditions . 10
4.2 Measuring instruments . 10
4.3 Artificial mains network . 10
4.4 Voltage probe . 11
4.5 Antennas . 11
5 Test set-up for emission and immunity . 11
5.1 General requirements . 11
5.2 Ancillary equipment . 12
6 Emission tests . 12
6.1 Classification of equipment . 12
6.1.1 Class A equipment . 12
6.1.2 Class B equipment . 13
6.2 Test conditions . 13
6.2.1 Test conditions for RF tests . 13
6.2.2 Test conditions for low-frequency tests . 13
6.3 Emission limits . 14
6.3.1 Mains terminal disturbance voltage . 14
6.3.2 Electromagnetic radiation disturbance . 16
6.3.3 Low-frequency emission limits . 19
6.3.4 Conducted emissions at signal, control and measurement ports . 19
7 Immunity tests . 20
7.1 Tests applicability . 20
7.2 Test conditions . 20
7.3 Immunity performance criteria . 20
7.3.1 Performance criteria A . 20
7.3.2 Performance criteria B . 20
7.3.3 Performance criteria C . 21
7.4 Immunity levels . 21
8 Documentation for the purchaser/user . 23
Annex A (informative) Limits . 25
A.1 General . 25
A.2 Mains terminal disturbance voltage limits . 25
A.3 Electromagnetic radiation disturbance limits . 25
Annex B (informative) Symbols . 26
Annex C (normative) Battery powered equipment . 27
C.1 General . 27
C.2 Additional emission requirements . 27
C.3 Additional immunity requirements . 27
Annex D (normative) Equipment containing radio devices . 28
D.1 General . 28

D.2 Additional emission requirements . 28
D.3 Additional immunity requirements . 28
Bibliography . 29

Figure 1 – Examples of ports . 9
Figure 2 – Test position for H field measurement . 12

Table 1 – Disturbance voltage limits – Idle state . 15
Table 2 – Disturbance voltage limits for Class A equipment – Loaded state . 16
Table 3 – Electromagnetic radiation disturbance limits – Idle state . 17
Table 4 – Electromagnetic radiation disturbance limits for Class A equipment – Loaded
state . 17
Table 5 – Electric field radiation disturbance limits for Class B equipment – Loaded
state . 18
Table 6 – Magnetic field radiation disturbance limits for Class B equipment – Loaded
state . 18
Table 7 – In-situ electromagnetic radiation disturbance limits for Class A equipment –
Loaded state . 19
Table 8 – Immunity levels – Enclosure . 21
Table 9 – Immunity levels – AC input power port . 22
Table 10 – Immunity levels – Ports for measurement and control . 23
Table B.1 – Symbols to describe EMC properties . 26

– 4 – IEC 62135-2:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESISTANCE WELDING EQUIPMENT –

Part 2: Electromagnetic compatibility (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 62135-2 has been prepared by IEC technical committee 26:
Electric welding.
This third edition cancels and replaces the second edition published in 2015. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) update of the applicable limits related to the updated references;
b) implementation of radiated magnetic field requirements.

The text of this standard is based on the following documents:
FDIS Report on voting
26/696/FDIS 26/698/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62135 series, under the general title Resistance welding
equipment, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 62135-2:2020 © IEC 2020
RESISTANCE WELDING EQUIPMENT –

Part 2: Electromagnetic compatibility (EMC) requirements

1 Scope
This part of IEC 62135 is applicable to equipment for resistance welding and allied processes
which are connected to mains supplies with rated voltages up to 1 000 V AC RMS. This
document does not define safety requirements.
Resistance welding equipment type tested in accordance with, and which has met the
requirements of, this document, is deemed to be in compliance for all applications.
The frequency range covered is from 0 Hz to 400 GHz.
Arc welding equipment containing a radio receiver or transmitter is within the scope of this
document. Additional requirements for such equipment is specified in Annex D.
The radiated emission requirements in this document are not intended to be applicable to the
intentional transmissions from a radio transmitter as defined by the ITU nor to any spurious
emissions related to these intentional transmitters.
This product EMC standard for resistance welding equipment takes precedence over all
aspects of the generic standards and no additional EMC tests are required or necessary.
NOTE 1 Typical allied processes are resistance hard and soft soldering or resistance heating achieved by means
comparable to resistance welding equipment.
NOTE 2 Limit values are specified for only part of the frequency range.
Resistance welding equipment are classified as Class A and Class B equipment.
This part of IEC 62135 specifies
a) test methods to be used in conjunction with CISPR 11:2015, CISPR 11:2015/AMD1:2016
and CISPR 11:2015/AMD2:2019 to determine radio-frequency (RF) emission;
b) relevant standards and test methods for harmonic current emission, voltage fluctuation
and flicker;
c) additional requirements for equipment powered by internal or external batteries (Annex C).
NOTE 3 The limits in this document cannot, however, provide full protection against interference to radio and
television reception when the resistance welding equipment is used closer than 30 m to the receiving antenna(e).
NOTE 4 In special cases, when highly susceptible apparatus is being used in close proximity, additional
mitigation measures are sometimes employed to further reduce the electromagnetic emissions.
NOTE 5 The origins of the limit values in this document are summarized in Annex A.
This part of IEC 62135 also defines immunity requirements and test methods for continuous
and transient, conducted and radiated disturbances including electrostatic discharges.
NOTE 6 These requirements do not, however, cover extreme cases which are extremely rare.

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 61000-3-2:2018, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
IEC 61000-3-3:2013, 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 61000-3-3:2013/AMD1:2017
IEC 61000-3-11:2017, 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 61000-3-12:2011, Electromagnetic compatibility (EMC) – Part 3-12: Limits for harmonic
currents produced by equipment connected to public low-voltage systems with input current >
16 A and ≤ 75 A per phase
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3 : Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-5:2014/AMD1:2017
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
IEC 61000-4-11:2004/AMD1:2017
IEC 61000-4-34:2005, 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 61000-4-34:2005/AMD1:2009
IEC 61000-6-1:2016, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards –
Immunity standard for residential, commercial and light-industrial environments
IEC 61000-6-2:2016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standard for industrial environments

– 8 – IEC 62135-2:2020 © IEC 2020
IEC 61000-6-3:2006, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards –
Emission standard for residential, commercial and light-industrial environments
IEC 61000-6-3:2006/AMD1:2010
IEC 61000-6-4:2018, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 62135-1:2015, Resistance welding equipment – Part 1: Safety requirements for design,
manufacture and installation
ISO 669:2016, Resistance welding – Resistance welding equipment – Mechanical and
electrical requirements
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
CISPR 11:2015/AMD2:2019
CISPR 16-1-1:2019, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
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 16-1-2:2014/AMD1:2017
CISPR 16-1-4:2019, 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
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
cable port
point at which a conductor or a cable is connected to the apparatus
Note 1 to entry: Examples are signal, control and power ports.
Note 2 to entry: The welding circuit of resistance welding equipment is not a cable port but is part of the
enclosure port.
3.2
click
disturbance which exceeds the limit of continuous disturbance no longer than 200 ms and
which is separated from a subsequent disturbance by at least 200 ms
Note 1 to entry: Both intervals are related to the level of the limit of continuous disturbance.
Note 2 to entry: A click may contain a number of impulses, in which case the relevant time is that from the
beginning of the first to the end of the last impulse.

[SOURCE: IEC 60050-851:2008, 851-15-13]
3.3
enclosure port
physical boundary of the apparatus through which electromagnetic fields may radiate or
impinge
3.4
FAR
fully-anechoic chamber
shielded enclosure, the internal surfaces of which are lined with radio-frequency-energy
absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the frequency
range of interest
[SOURCE: CISPR 11:2015/AMD1:2016, 3.20]
3.5
idle state
operating state in which the power is switched on and the welding circuit is not energized
Note 1 to entry: For some types of equipment there is no idle state.
Note 2 to entry: For a power source in a mechanized system, the configuration to achieve idle state is defined by
the manufacturer.
Note 3 to entry: An idle state can include a low energy state in which a welding process cannot be started without
automatic or manual reactivation.
3.6
OATS
open-area test site
facility used for measurements of electromagnetic fields the intention for which is to simulate
a semi-free-space environment over a specified frequency range that is used for radiated
emission testing of products
Note 1 to entry: An OATS typically is located outdoors in an open area, and has an electrically-conducting ground
plane.
[SOURCE: CISPR 11:2015/AMD1:2016, 3.21]
3.7
port
particular interface of an equipment which couples this equipment with the external
electromagnetic environment (IEC 60050-161:2018, 161-01-01) and through which the
equipment is influenced by this environment
EXAMPLE Examples of ports of interest are shown in Figure 1. The enclosure port is the physical boundary of the
apparatus (e.g. enclosure). The enclosure port provides for radiated and electrostatic discharge (IEC 60050-
161:2018, 161-01-22) energy transfer, whereas the other ports provide for conducted energy transfer.

Figure 1 – Examples of ports
Note 1 to entry: Ports in the subject area of electromagnetic compatibility are specific cases of the port defined in
IEC 60050-131:2002, 131-12-60.

– 10 – IEC 62135-2:2020 © IEC 2020
[SOURCE: IEC Guide 107:2009, 3.1.12, modified – The presentation of the term and the
wording of the definition have been revised for compatibility with IEC 60050 (all parts).]
3.8
SAC
semi-anechoic chamber
shielded enclosure, in which five of the six internal surfaces are lined with radio-frequency
energy absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the
frequency range of interest, and the bottom horizontal surface is a conducting ground plane
for use with OATS test set-ups
[SOURCE: CISPR 11:2015/AMD1:2016, 3.22]
3.9
small equipment
equipment, either positioned on a table top or standing on the floor which, including its cables
fits in an imaginary cylindrical test volume of 1,2 m in diameter and 1,5 m height (to ground
plane)
[SOURCE: CISPR 11:2015, 3.17, modified – Replacement of the term "small size equipment"
by "small equipment".]
3.10
wired network port
port for the connection of voice, data and signalling transfers intended to interconnect widely-
dispersed systems by direct connection to a single-user or multi-user communication network
Note 1 to entry: Examples of these include CATV, PSTN, ISDN, xDSL, LAN and similar networks.
Note 2 to entry: These ports may support screened or unscreened cables and may also carry AC or DC power
where this is an integral part of the telecommunication specification.
[SOURCE: CISPR 32:2015, 3.1.32]
4 General test requirements
4.1 Test conditions
Tests shall be carried out on completely assembled equipment representative of the series
production. Tests shall be performed within the specified operating conditions for the
apparatus at its rated supply voltage and frequency as given in IEC 62135-1:2015. Results
obtained for RF emission and immunity at 50 Hz are valid for the same model operating at
60 Hz and vice versa.
4.2 Measuring instruments
The measuring equipment shall comply with the requirements of CISPR 16-1-1:2019 and the
standards referred to in Table 8, Table 9 and Table 10 as applicable.
4.3 Artificial mains network
Measurement of the mains terminal disturbance voltage shall be made using an artificial
mains network, if commercially available, consisting of 50 Ω/50 µH or a 50 Ω/50 µH + 5 Ω V-
network as specified in CISPR 16-1-2:2014 and CISPR 16-1-2:2014/AMD1:2017.
The artificial network is required to provide a defined impedance at RF across the mains
supply at the point of measurement and also to provide for isolation of the equipment under
test from ambient noise on the power lines.

4.4 Voltage probe
A voltage probe as specified in CISPR 16-1-2:2014 and CISPR 16-1-2:2014/AMD1:2017 shall
be used when the artificial mains network cannot be used. The probe is connected
sequentially between each line and the reference earth. The probe shall consist of a blocking
capacitor and a resistor such that the total resistance between the line and earth is at least
1 500 Ω. The effect on the accuracy of measurement of the capacitor or any other device
which may be used to protect the measuring receiver against dangerous currents shall be
either less than 1 dB or allowed for in calibration.
4.5 Antennas
In the frequency range below 30 MHz the antenna shall be a loop as specified in
CISPR 16-1-4:2019.
In the frequency range from 30 MHz to 1 GHz the antenna(s) used shall be as specified in
CISPR 16-1-4:2019. Measurements shall be made for both horizontal and vertical polarization.
The nearest point of the antenna(s) to the ground shall be not less than 0,2 m.
5 Test set-up for emission and immunity
5.1 General requirements
Emission and immunity testing shall be carried out on a representative resistance welding
installation as described below. Resistance welding equipment tested in such an installation
shall be considered to have met the necessary requirements of this document.
If the resistance welding equipment is part of an installation, or can be connected to auxiliary
equipment, then the resistance welding equipment shall be tested whilst connected to the
minimum configuration of auxiliary equipment necessary to exercise the ports. If the
resistance welding equipment has a large number of similar ports or ports with many similar
connections, then a sufficient number shall be selected to simulate actual operating
conditions and to ensure that all the different types of termination are covered.
Measurements to determine compliance with the low-frequency emission limits shall be made
in accordance with the test procedures of relevant basic and referenced standards.
For electromagnetic radiation disturbance tests the separation between the antenna and the
equipment under test shall be as specified in Clause 6 of CISPR 11:2015, CISPR
11:2015/AMD1:2016 and CISPR 11:2015/AMD2:2019.
For radiated emission test in the frequency range between 150 kHz and 1 MHz, the antenna
shall be positioned on the axis z, as given in Figure 2, perpendicular to the plane x, y of the
welding circuit.
– 12 – IEC 62135-2:2020 © IEC 2020

Figure 2 – Test position for H field measurement
Specific test set-up geometries for immunity tests are found in the basic standards referred to
in Table 8, Table 9 and Table 10.
Class A resistance welding equipment may be measured either on a test site or in situ as
preferred by the manufacturer.
NOTE 1 Due to size, complexity or operating conditions, some resistance welding equipment are sometimes
measured in situ in order to show compliance with the radiation disturbance limits specified herein.
NOTE 2 By their nature, in situ tests are not adequate for type testing purposes.
Class B resistance welding equipment shall be measured on a test site.
The configuration of the resistance welding equipment under test shall be precisely noted in
the test report.
5.2 Ancillary equipment
Ancillary equipment shall be tested in conjunction with the resistance welding equipment. It
shall be connected, installed, configured and operated as recommended by the manufacturer.
6 Emission tests
6.1 Classification of equipment
6.1.1 Class A equipment
Class A equipment is equipment suitable for use in all locations other than those allocated in
residential environments and those directly connected to a low voltage power supply network
which supplies buildings used for domestic purposes.
NOTE This definition originates from CISPR 11:2015, 5.2.
Class A equipment shall meet Class A limits in accordance with 6.3.

6.1.2 Class B equipment
Class B equipment is equipment suitable for use in residential environments and in
establishments directly connected to a low voltage power supply network which supplies
buildings used for domestic purposes.
NOTE This definition originates from CISPR 11:2015, 5.2.
Class B equipment shall meet Class B limits in accordance with 6.3.
6.2 Test conditions
6.2.1 Test conditions for RF tests
Measurements to determine compliance with the emission limits shall be made in accordance
with the test procedures in CISPR 11:2015, CISPR 11:2015/AMD1:2016 and CISPR
11:2015/AMD2:2019 and as detailed below, using the test set-up given in Clause 5.
Resistance welding equipment is extremely diverse in its design and working conditions. It
shall be tested under the following conditions:
a) idle state
b) loaded
– set up the welding circuit to minimize the impedance and to produce the highest flow of
current (i.e., using minimum arms length and gap);
– set up the electrodes in short-circuit condition according to ISO 669:2016;
– adjust the current to obtain the highest emission, if means of adjustment are provided;
NOTE For thyristor-controlled equipment, an ignition delay angle of 90° typically gives the highest
emission value.
– select a duty cycle and a welding heat time appropriate for the tested resistance
welding equipment and the requirements of the measuring instrumentation.
The test parameters chosen shall be fully documented.
6.2.2 Test conditions for low-frequency tests
Resistance welding equipment is extremely diverse in its design and working conditions. It
shall be tested under the following conditions:
– set up the welding circuit to minimize the impedance and to produce the highest flow of
current;
– set up the electrodes in short-circuit condition according to ISO 669:2016;
– adjust the current to obtain the highest emission, if means of adjustment are provided;
– calculate the equipment duty cycle X at the maximum welding current based on Formula (1)
and
I
( )
2P
(1)
X =
I
( )
2cc
where
I is the permanent output current;
2P
I is the maximum short circuit welding current;
2cc
– select an observation period and a welding heat time appropriate for the calculated duty
cycle, the tested resistance welding equipment and the requirements of the measuring
instrumentation.
– 14 – IEC 62135-2:2020 © IEC 2020
The test parameters chosen shall be fully documented.
The arithmetic average value of 1,5 s smoothed RMS supply current values (I as per
ref
IEC 61000-3-12:2011) shall be measured when the welding equipment is delivering its
maximum rated output current I .
2cc
For welding equipment with a rated maximum supply current I below 16 A, the reference
1cc
current I for the definition of limits shall be 16 A.
ref
The maximum and arithmetic average values of 1,5 s smoothed RMS harmonic current values
in each discrete Fourier transform (DFT) time window shall be determined over one or more
full thermal cycle(s) including the idle state period.
The same welding heat time shall be used for the determination of I and the harmonic
ref
component values.
NOTE An idle state period of more than 10 % is not a stand-by mode as defined in IEC 61000-3-12:2011, but an
operational mode of the welding equipment within its full thermal cycle.
6.3 Emission limits
6.3.1 Mains terminal disturbance voltage
6.3.1.1 Idle state
The mains terminal disturbance voltage limits for Class A and Class B resistance welding
equipment in idle state are given in Table 1. The appropriate set of limits shall be selected in
accordance with the maximum rated input power of the equipment, calculated using the rated
maximum input current I .
1cc
Table 1 – Disturbance voltage limits – Idle state
Class A Class A Class A
Class B maximum rated input maximum rated input maximum rated input
Frequency
a b
power ≤ 20 kVA power > 20 kVA power > 75 kVA
range
dBµV
dBµV dBµV dBµV
MHz
Quasi-peak Average Quasi-peak Average Quasi-peak Average Quasi-peak Average
66 56
Decreasing linearly with
0,15 to 0,50 79 66 100 90 130 120
logarithm of frequency to
56 46
0,50 to 5 56 46 73 60 86 76 125 115
90 80
Decreasing linearly
with
5 to 30 60 50 73 60 115 105
logarithm of frequency
to
73 60
At the transition frequency, the more stringent limit shall apply.
a
These limits apply to equipment with a rated power > 20 kVA and intended to be connected to a dedicated
power transformer or generator, and which is not connected to low voltage (LV) overhead power lines. For
equipment not intended to be connected to a user specific power transformer the limits for ≤ 20 kV A apply. The
manufacturer, and/or supplier shall provide information on installation measures that can be used to reduce
emissions from the installed equipment. In particular it shall be indicated that this equipment is intended to be
connected to a dedicated power transformer or generator and not to LV overhead power lines.
b
These limits apply only to high power electronic systems and equipment with a rated power greater than 75 kVA
when intended to be installed as follows:
– the installation is supplied from a dedicated power transformer or generator, and which is not connected to
low voltage (LV) overhead power lines,
– the installation is physically separated from residential environments by a distance greater than 30 m or by
a structure which acts as a barrier to radiated phenomena,
– the manufacturer and/or supplier shall indicate that this equipment meets the disturbance voltage limits for
high power electronic systems and equipment of rated input power > 75 kVA and provide information on
installation measures to be applied by the installer. In particular, it shall be indicated that this equipment is
intended to be used in an installation which is powered by a dedicated power transformer or generator and
not by LV overhead power lines.

NOTE Values are based on the limits for group 1 equipment in CISPR 11:2015, CISPR 11:2015/AMD1:2016 and
CISPR 11:2015/AMD2:2019.
The equipment under test (EUT) shall meet either both average and quasi-peak limits using
the corresponding detectors or the average limit when using the quasi-peak detector.
6.3.1.2 Loaded
The mains terminal disturbance voltage limits for Class A and Class B resistance welding
equipment are the group 2 limits given in Table 2. The appropriate set of limits shall be
selected in accordance with the maximum rated input power of the equipment, calculated
using the rated maximum input current I .
1cc
– 16 – IEC 62135-2:2020 © IEC 2020
Table 2 – Disturbance voltage limits for Class A equipment – Loaded state
Class A Class A
Class B maximum rated input power maximum rated input
Frequency
a a,b
≤ 75 kVA power > 75 kVA
range
dBµV
dBµV dBµV
MHz
Quasi-peak Average Quasi-peak Average Quasi-peak Average
66 56
Decreasing linearly with
0,15 to 0,50 100 90 130 120
logarithm of frequency to
56 46
0,50 to 5 56 46 86 76 125 115
90 80
Decreasing linearly with
5 to 30 60 50 115 105
logarithm of frequency to
73 60
At the transition frequency, the more stringent limit shall apply.
a
The maximum rated input power is calculated using the rated maximum supply current I .
1cc
b
The manufacturer and/or supplier shall provide information on installation measures that can be used to
reduce emissions from the installed equipment.

The EUT shall meet either both average and quasi-peak limits using the corresponding
detectors or the average limit when using the quasi-peak detector.
For Class A equipment, impulse noise (clicks) which occurs less than 5 times per minute is
not considered.
For Class B equipment, where impulse noise (clicks) occurs less than 0,2 times per minute, a
relaxation of the limits of 44 dB is allowed. For clicks appearing between 0,2 and 30 times per
minute, a relaxation of the limits is allowed of 20 log (30/N) dB (where N is the number of
clicks per minute). Criteria for separated clicks can be found in CISPR 14-1:2016.
6.3.2 Electromagnetic radiation disturbance
6.3.2.1 Idle state
The electromagnetic radiation disturbance limits for Class A and Class B resistance welding
equipment in idle state are given in Table 3.

Table 3 – Electromagnetic radiation disturbance limits – Idle state
Class B Class A
Quasi-peak Quasi-peak
Frequency dBµV/m dBµV/m
range
a,b a,b
OATS or
...