IEC 60974-10:2007

IEC 60974-10
Edition 2.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 10: Electromagnetic compatibility (EMC) requirements

Matériel de soudage à l’arc –
Partie 10: Exigences de compatibilité électromagnétique (CEM)

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IEC 60974-10
Edition 2.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 10: Electromagnetic compatibility (EMC) requirements

Matériel de soudage à l’arc –
Partie 10: Exigences de compatibilité électromagnétique (CEM)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 25.160 ISBN 2-8318-9302-X
– 2 – 60974-10 © IEC:2007
CONTENTS
FOREWORD.4

1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 General test requirements .8
4.1 Test conditions.8
4.2 Measuring instruments .8
4.3 Artificial mains network .8
4.4 Voltage probe.8
4.5 Antennas.8
5 Test set-up for emission and immunity.8
5.1 General .8
5.2 Load.10
5.3 Ancillary equipment .10
5.3.1 General requirements .10
5.3.2 Wire feeders.10
5.3.3 Remote controls .11
6 Emission tests .11
6.1 Classification for r.f. emission tests .11
6.1.1 Class A equipment .11
6.1.2 Class B equipment .11
6.2 Test conditions.11
6.2.1 Welding power source .11
6.2.2 Load.12
6.2.3 Wire feeders.12
6.2.4 Ancillary equipment .12
6.3 Emission limits .13
6.3.1 General .13
6.3.2 Mains terminal disturbance voltage.13
6.3.3 Electromagnetic radiation disturbance .14
6.3.4 Harmonics, voltage fluctuations and flicker .14
7 Immunity tests .14
7.1 Classification.14
7.1.1 Applicability of tests.14
7.1.2 Category 1.14
7.1.3 Category 2.15
7.2 Test conditions.15
7.3 Immunity performance criteria .15
7.3.1 Performance criterion A .15
7.3.2 Performance criterion B .15
7.3.3 Performance criterion C.15
7.4 Immunity levels .15
8 Documentation for the purchaser/user .17

Annex A (informative) Installation and use .18

60974-10 © IEC:2007 – 3 –
Annex B (informative) Limits .20

Figure 1 – Typical arc welding equipment with a conventional load .9
Figure 2 – Position of arc welding equipment and conventional load with respect to the
antenna .9

Table 1 – Immunity levels – Enclosure .16
Table 2 – Immunity levels – AC input power port.16
Table 3 – Immunity levels – Ports for process measurement and control lines.16
Table B.1 – Mains terminal disturbance voltage limits, idle state.20
Table B.2 – Mains terminal disturbance voltage limits, load conditions.20
Table B.3 – Electromagnetic radiation disturbance limits, idle state .21
Table B.4 – Electromagnetic radiation disturbance limits, load conditions .21
Table B.5 – Maximum permissible harmonic current for non-professional equipment
with input current I ≤ 16 A .21
1max
Table B.6 – Current emission limits for professional equipment with I ≤ 75 A other
1max
than balanced three-phase equipment .22
Table B.7 – Current emission limits for professional balanced three-phase equipment
with I ≤ 75 A.22
1max
Table B.8 – Current emission limits for professional balanced three-phase equipment
with I ≤ 75 A under specified conditions .22
1max
Table B.9 – Limits for arc welding equipment with I ≤ 75 A.23
1max
– 4 – 60974-10 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 10: 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, 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60974-10 has been prepared by IEC technical committee 26:
Electric welding.
This second edition cancels and replaces the first edition published in 2002 and amendment 1
(2004) and constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– application of more stringent r.f. emission limits for the idle state;
– mandatory classification of arc starting and stabilizing devices as Class A equipment;
– additional immunity tests (surges and r.f. common-mode currents);
– inclusion of informative Annex B, containing the applicable emission limits for information
of the user of the standard.
60974-10 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
26/341/CDV 26/356/RVC
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.
The list of all the parts of the IEC 60974 series, under the general title Arc welding equipment,
can be found on the IEC web site.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site 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.
The contents of the corrigendum of June 2011 have been included in this copy.

– 6 – 60974-10 © IEC:2007
ARC WELDING EQUIPMENT –
Part 10: Electromagnetic compatibility (EMC) requirements

1 Scope
This part of IEC 60974 specifies
a) applicable standards and test methods for radio-frequency (r.f.) emissions;
b) applicable standards and test methods for harmonic current emission, voltage fluctuations
and flicker;
c) immunity requirements and test methods for continuous and transient, conducted and
radiated disturbances including electrostatic discharges.
This standard is applicable to equipment for arc welding and allied processes, including power
sources and ancillary equipment, for example wire feeders, liquid cooling systems and arc
striking and stabilizing devices.
NOTE 1 Allied processes are, for example, plasma cutting and arc stud welding.
NOTE 2 This standard does not specify basic safety requirements for arc welding equipment such as protection
against electric shock, unsafe operation, insulation coordination and related dielectric tests.
Arc welding equipment type tested in accordance with, and which has met the requirements
of, this standard is considered to be in compliance for all applications.
2 Normative references
The following referenced documents are indispensable for the application 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 – Chapter 851: Electric welding
IEC 60974-1, Arc welding equipment – Part 1: Welding power sources
IEC 60974-3, Arc welding equipment – Part 3: Arc striking and stabilizing devices
IEC 60974-6, Arc welding equipment – Part 6: Power sources for manual metal arc welding
with limited duty
IEC 61000-3-2:2005, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
IEC 61000-3-3:1994, 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
Amendment 1 (2001)
Amendment 2 (2005)
———————
There exists a consolidated edition 1.2 (2005) that includes edition 1 and its amendments 1 and 2.

60974-10 © IEC:2007 – 7 –
IEC/TS 61000-3-4, Electromagnetic compatibility (EMC) – Part 3-4: Limits – Limitation of
emission of harmonic currents in low-voltage power supply systems for equipment with rated
current greater than 16 A
IEC 61000-3-11:2000, 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 61000-3-12:2004, 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, 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
CISPR 11:2003, Industrial, scientific and medical (ISM) radio-frequency equipment – Radio
disturbance characteristics – Limits and methods of measurement
CISPR 14-1, Electromagnetic compatiblility – Requirements for household appliances, electric
tools and similar apparatus – Part 1: Emission
CISPR 16-1-1, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
CISPR 16-1-2, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Conducted disturbances
CISPR 16-1-4, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Ancillary
equipment – Radiated disturbances
3 Terms and definitions
For the purposes of this document, the terms and definitions related to EMC and to the
relevant phenomena contained in IEC 60050-161, the terms and definitions related to arc
welding equipment contained in IEC 60050-851 and in IEC 60974-1, as well as the following,
apply.
3.1
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

– 8 – 60974-10 © IEC:2007
NOTE 1 Both intervals are related to the level of the limit of continuous disturbance.
NOTE 2 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.
3.2
idle state
operating state in which the power is switched on and the welding circuit is not energized
NOTE For some types of equipment, there is no idle state, but a welding state preceding arc striking.
4 General test requirements
4.1 Test conditions
Tests shall be carried out within the specified operating conditions for the apparatus, as given
in IEC 60974-1 or IEC 60974-6, and at its rated supply voltage and frequency. Results
obtained for r.f. 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 and the
standards referred to in Tables 1, 2 and 3 as applicable.
4.3 Artificial mains network
Measurement of the mains terminal disturbance voltage shall be made using an artificial
mains network consisting of 50 Ω/50 μH V-network as specified in CISPR 16-1-2.
The artificial network is required to provide a defined impedance at r.f. 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 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 from 30 MHz to 1 GHz, the antenna(s) used shall be as specified in
CISPR 16-1-4. 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
Emission and immunity testing shall be carried out on equipment configured in accordance
with Figure 1. Arc welding equipment tested in such a configuration shall be considered to
have met the necessary requirements of this standard.
If due to the design of the arc welding equipment, these tests cannot be carried out as
described, the manufacturer’s recommendations (for example, temporary bypassing or
disablement of control circuits) should be followed in order to match these test objectives. Any
temporary changes to the arc welding equipment shall be documented.

60974-10 © IEC:2007 – 9 –
The configuration of the equipment under test shall be noted in the test report.

Key
1 Wire feeder 7 Insulation
2 Welding power source 8 Earthed ground plane
3 Welding cable (bundled) 9 Liquid cooling systems
4 Interconnection cable (bundled) 10 Input supply cable
5 Remote control 11 Remote control cable (bundled)
6 Conventional load
a = 1 m b
≤ 0,4 m
NOTE Items 1, 5, 9 and 11 are ancillary equipment, as applicable.
Figure 1 – Typical arc welding equipment with a conventional load

Key
W Arc welding equipment A Antenna
3 Welding cable 6 Conventional load
a = 1 m c See IEC 61000-4-3 and 6.3.3
Figure 2 – Position of arc welding equipment and conventional load
with respect to the antenna
– 10 – 60974-10 © IEC:2007
If ancillary equipment can be connected to the welding power source, then the welding power
source shall be tested with the minimum configuration of ancillary equipment necessary to
exercise the ports. If the welding power source 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.
For conducted r.f. emission tests the welding power source shall be connected to the
electricity supply using the V-network specified in 4.3 whenever possible. The V-network shall
be located so that its closest surface is no less than 0,8 m from the nearest boundary of the
equipment under test. The input cable shall have a minimum length of 2 m.
The welding power source shall be connected to the conventional load by welding cables of
suitable cross-section for the welding current, or the appropriate torch or electrode holder with
adapter. The welding cables shall have a minimum length of 2 m.
For r.f. emission tests the welding power source shall be insulated by an insulating mat (or
blocks) not greater than 12 mm thick or insulated by its own under-gear if appropriate.
For radiated emission and immunity tests, the welding power source and conventional load
shall be positioned equidistant from the test antenna; see Figure 2.
The cables shall be allowed to fall naturally to the ground plane. Excess input, welding or
torch cables shall be folded to and forth, as far as practicable, to form a bundle not exceeding
0,4 m in length.
Specific test set-up geometries for immunity tests can be found in the basic standards
referenced in Tables 1, 2 and 3.
5.2 Load
During the tests, the arc welding operation is simulated by loading the equipment with a
conventional load as specified in IEC 60974-1. For r.f. emission tests the conventional load
shall be insulated by an insulating mat (or blocks) not greater than 12 mm thick or insulated
by its own under-gear if appropriate.
5.3 Ancillary equipment
5.3.1 General requirements
Ancillary equipment shall be tested in conjunction with a welding power source. It shall be
connected and installed as recommended by the manufacturer.
Specific requirements for wire feeders and remote controls are given below.
5.3.2 Wire feeders
Wire feeders shall be positioned on/by a welding power source as designed. Wire feeders,
which can be located both inside or outside the welding power source enclosure, shall be
placed outside. For r.f. emission tests, wire feeders designed to be placed on the floor shall
be insulated from it, by an insulating mat (or blocks) not greater than 12 mm thick or insulated
by its own under-gear, if appropriate.

60974-10 © IEC:2007 – 11 –
The welding cable connecting the wire feeder to the welding power source shall be 2 m in
length or longer, if required, to make the connection and be of suitable current rating. If a
welding cable in excess of 2 m is provided by the manufacturer, the excess shall be folded to
and forth, as far as practicable, to form a bundle not exceeding 0,4 m in length. A welding
cable connection less than 2 m long shall be permitted if this is supplied with the equipment.
The interconnection cable(s) between the wire feeder and the welding power source shall be
of the type and length recommended by the manufacturer. Excess cable shall be folded to and
forth, as far as practicable, to form a bundle not exceeding 0,4 m in length.
A welding torch, as recommended by the manufacturer, may be used instead of a welding
cable to make the connection from the wire feeder to the conventional load.
5.3.3 Remote controls
If a welding power source is capable of operating with a remote control, it shall be tested with
the remote control connected, which is expected to give the highest emissions and/or lowest
immunity. The remote control shall be placed on, and insulated from, the ground plane beside
the load, where possible. For r.f. emission tests, the insulation shall not be greater than
12 mm thick. Remote controls designed to be attached to the arc welding equipment during
use shall be placed as intended.
Excess cable shall be folded to and forth to form a bundle not exceeding 0,4 m in length, as
far as practicable.
6 Emission tests
6.1 Classification for r.f. emission tests
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 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 shall meet Class B limits in accordance with 6.3.
6.2 Test conditions
6.2.1 Welding power source
6.2.1.1 Test conditions for r.f. emission tests
The welding power source shall be tested at the conventional load voltages referenced in
6.2.2 under the following output conditions:
a) at rated minimum welding current;
b) at rated welding current at 100 % duty cycle.
Additionally, if there is an idle state, the welding power source shall be tested in this condition
with the configuration shown in Figure 1, with the load disconnected.

– 12 – 60974-10 © IEC:2007
If the primary current is greater than 25 A at any of the output conditions given above, the
output may be reduced to give a primary current of 25 A. However, if a primary current of 25 A
or less cannot be achieved, the voltage probe, as specified in 4.4, may be used in 6.3.2 as an
alternative to an artificial mains network.
Welding power sources capable of operating in both a.c. and d.c. modes shall be tested in
both modes.
Multi-process welding power sources shall be tested with the conventional load which gives
the highest load voltage for the set current. If a welding power source contains more than one
output circuit (for example, plasma cutting and manual arc welding), each circuit shall be
tested separately.
For power sources with an external wire feeder, only the MIG configuration shall be tested
with the MIG conventional load voltage.
6.2.1.2 Test conditions for harmonics
Welding power sources within the scope of IEC 60974-1 shall be tested at the conventional
load voltage according to the process as given in 6.2.2 at maximum rated welding current at
the rated duty cycle. The observation period shall be 10 min.
Welding power sources capable of operating in both a.c. and d.c. modes shall be tested in
both modes.
Multi-process welding power sources shall be tested with the conventional load which gives
the highest conventional load voltage for the set current.
Test conditions for welding power sources within the scope of IEC 60974-6 are given in
IEC 61000-3-2.
6.2.1.3 Test conditions for voltage fluctuations and flicker
Test conditions for welding power sources are given in IEC 61000-3-3.
6.2.2 Load
Conventional load voltages are given in IEC 60974-1 or IEC 60974-6.
6.2.3 Wire feeders
Wire feeders shall be tested at 50 % of the maximum wire feed speed setting, where possible.
Pre-programmed and synergic wire feeders shall be tested according to the output setting of
the welding power source.
During this test, pressure shall be removed from the drive rolls of the wire feeder and the
welding power source shall be loaded as given in 6.2.1.1.
6.2.4 Ancillary equipment
Other ancillary equipment shall be tested according to the manufacturer’s recommendations.
Arc striking and stabilizing devices and arc stud welding equipment shall be classified as
Class A equipment. For arc striking and stabilizing devices which are energy limited in
accordance with IEC 60974-3, no additional r.f. emission tests are required.

60974-10 © IEC:2007 – 13 –
6.3 Emission limits
6.3.1 General
Emission limits are designed to reduce the probability of interference but will not in all cases
eliminate interference, for example, when the receiving apparatus is in close proximity or has
a high degree of sensitivity.
The ability of arc welding equipment to work in a compatible manner with other radio and
electronic systems is greatly influenced by the manner in which it is installed and used. For
this reason a code of practice is appended to this standard (see Annex A), and it is important
that the arc welding equipment be installed and used in accordance with this code of practice
if electromagnetic compatibility is to be achieved.
Class A equipment is not intended for use in residential locations where the electrical power
is provided by the public low-voltage supply system. A statement shall be included in the
documentation for the user, drawing attention to the fact that there may be potential
difficulties in ensuring electromagnetic compatibility in those locations.
6.3.2 Mains terminal disturbance voltage
6.3.2.1 Idle state
The mains terminal disturbance voltage limits for Class A arc welding equipment are the
Group 1 limits given in Table 2a of CISPR 11.
The mains terminal disturbance voltage limits for Class B arc welding equipment are the
Group 1 limits given in Table 2b of CISPR 11.
The EUT shall meet either both the average and the quasi-peak limits using corresponding
detectors or the average limit when using a quasi-peak detector.
6.3.2.2 Loaded
The mains terminal disturbance voltage limits for Class A arc welding equipment are the
Group 2 limits given in Table 2a of CISPR 11. The applicable limit shall be selected based on
the rated maximum supply current I value.
1max
The mains terminal disturbance voltage limits for Class B arc welding equipment are the
Group 2 limits given in Table 2b of CISPR 11.
The EUT shall meet either both the average and the quasi-peak limits using corresponding
detectors or the average limit when using a 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 impulse noise (clicks) which 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 of
20 log (30/N) dB is allowed (where N is the number of clicks per minute). Criteria for
separated clicks may be found in CISPR 14-1.

– 14 – 60974-10 © IEC:2007
6.3.3 Electromagnetic radiation disturbance
6.3.3.1 General
For radiated emission tests the separation between the antenna and the equipment under test
shall be as specified in Clause 5 of CISPR 11.
6.3.3.2 Idle state
The electromagnetic radiation disturbance limits for Class A arc welding equipment are the
Group 1 limits given in Table 3 of CISPR 11.
The electromagnetic radiation disturbance limits for Class B arc welding equipment are the
Group 1 limits given in Table 3 of CISPR 11.
6.3.3.3 Loaded
The electromagnetic radiation disturbance limits for Class A arc welding equipment are the
limits given in Table 5b of CISPR 11.
The electromagnetic radiation disturbance limits for Class B arc welding equipment in the
frequency band 30 MHz to 1 000 MHz are the Group 2 limits given in Table 4 of CISPR 11.
6.3.4 Harmonics, voltage fluctuations and flicker
The limits for
a) harmonic current emissions are given in IEC 61000-3-2 and IEC 61000-3-12;
b) voltage fluctuations and flicker are given in IEC 61000-3-3 and IEC 61000-3-11;
and are applicable to arc welding equipment, as far as covered by the scope of these
standards.
NOTE IEC/TS 61000-3-4 may be used to guide the parties concerned by the installation of arc welding
equipment with an input current above 75 A in a low-voltage network.
7 Immunity tests
7.1 Classification
7.1.1 Applicability of tests
Arc welding equipment covered by this standard is sub-divided into categories for the purpose
of immunity requirements as given below. Category 1 arc welding equipment is considered to
meet the necessary immunity requirements without testing. Category 2 arc welding equipment
shall fulfil the requirements of 7.4.
7.1.2 Category 1
Arc welding equipment containing no electronic control circuitry, for example, transformers,
transformer rectifiers, passive remote controls, liquid cooling systems, CO -heaters and non-
electronic wire feeders.
Electric circuits consisting of passive components such as inductors, r.f. suppression
networks, mains frequency transformers, rectifiers, diodes and resistors are not considered to
be electronic control circuitry.

60974-10 © IEC:2007 – 15 –
7.1.3 Category 2
All arc welding equipment excluded from Category 1 above.
7.2 Test conditions
Welding power sources shall be tested during no-load and loaded operation at the welding
current corresponding to a 100 % duty cycle, when delivering current into a conventional load
in accordance with 6.2.2.
If the primary current is greater than 25 A at any of the output conditions given above, the
output may be reduced to give a primary current of 25 A.
Compliance shall be checked by measuring the no-load voltage and the mean value of the
welding current.
Wire feeders shall be tested at 50 % of the maximum setting. The speed of the wire feeder
shall be measured using a tachogenerator on a drive roll or by using other equivalent means.
NOTE To carry out this test, the pressure should be removed from the drive rolls.
7.3 Immunity performance criteria
7.3.1 Performance criterion A
The arc welding equipment shall continue to operate as intended. A variation in welding
current, wire feed speed and travel speed of ±10 % of the setting is permitted, unless the
manufacturer states otherwise. All controls shall continue to function and, in particular, it shall
be possible to terminate the welding current using the normal switch provided, for example,
the switch on a metal inert/active gas welding torch or foot control. No loss of stored data is
permitted. After the test the output shall return to the original setting. Under no circumstances
shall the no-load voltage exceed those values given in IEC 60974-1.
7.3.2 Performance criterion B
+50
A variation in welding current, wire feed speed and travel speed of % is permitted (in
−100
practice this may result in the arc extinguishing, in which case the arc may be reinitiated by
the operator using the normal means). It shall be possible to terminate the welding current
using the normal switch provided, for example the switch on a metal inert/active gas welding
torch or foot control. No loss of stored data is permitted. After the test the output shall return
to the original setting. Under no circumstances shall the no-load voltage exceed those values
given in IEC 60974-1.
7.3.3 Performance criterion C
Temporary loss of function is permitted, requiring the arc welding equipment to be reset
manually.
NOTE This may require the equipment to be switched off and on.
No loss of stored data is permitted unless it can be restored by the operation of the controls.
Under no circumstances shall the no-load voltage exceed those values given in IEC 60974-1.
7.4 Immunity levels
Immunity requirements are given in Table 1 for the enclosure, Table 2 for the a.c. input power
port and Table 3 for ports for process measurement and control lines.

– 16 – 60974-10 © IEC:2007
Table 1 – Immunity levels – Enclosure
Test Performance
Phenomena Units Basic standard Remarks
specification criteria
MHz 80 to 1 000
The test level
Radiofrequency EM field, V/m (unmod. 10
IEC 61000-4-3 specified is prior to A
amplitude modulated r.m.s.)
modulation
% AM (1 kHz) 80
Contact kV (charge
a
B
±4 See basic standard
discharge voltage)
Electrostatic for applicability of
IEC 61000-4-2
contact and/or air
discharge
Air kV (charge
a
discharge test.
B
±8
discharge voltage)
a
Testing is not required at lower levels than those specified.

Table 2 – Immunity levels – AC input power port
Test Performance
Phenomena Units Basic standard Remarks
specification criteria
kV (peak)
±2
Repetition frequency kHz
Fast transients 5 IEC 61000-4-4 Direct injection B
Tr/Th ns 5/50
See note
Radio-
MHz 0,15 to 80
The test level
frequency IEC 61000-4-6 A
V (unmod. r.m.s.) 10
specified is prior to
common mode
% AM (1kHz) 80
modulation
This test is not
required when
Surges Tr/Th µs 1,2/50 (8/20)
normal functioning
line-to-line kV (open-circuit voltage) ±1 IEC 61000-4-5 cannot be achieved B
because of the
line-to-earth kV (open-circuit voltage) ±2
impact of the CDN
on the EUT
% reduction 30
B
periods 0,5
Voltage dips IEC 61000-4-11 –
% reduction 60
C
periods 5
NOTE The test level can also be defined as the equivalent current into a 150 Ω load.

Table 3 – Immunity levels – Ports for process measurement and control lines
Test Performance
Phenomena Units Basic standard Remarks
specification criteria
kV (peak)
±2
Tr/Th ns
Fast transients 5/50 IEC 61000-4-4 Capacitive clamp B
Repetition frequency kHz
See note
Radio- MHz 0,15 to 80
The test level
freque
...