Arc welding equipment - Part 1: Welding power sources

This part of IEC 60974 is applicable to power sources for arc welding and allied processes designed for industrial and professional use, and supplied by a voltage not exceeding 1 000 V, or driven by mechanical means. This part of IEC 60974 specifies safety and performance requirements of welding power sources and plasma cutting systems. This part of IEC 60974 is not applicable to welding power sources for manual metal arc welding with limited duty operation which are designed mainly for use by laymen and designed in accordance with IEC 60974-6. This part of IEC 60974 is not applicable to testing of power sources during periodic maintenance or after repair.

Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen

Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage

La CEI 60974-1:2012 s'applique aux sources de courant de soudage à l'arc et techniques connexes conçues pour un usage industriel et professionnel et alimentées sous une tension ne dépassant pas 1 000 V, ou entraînées par des moyens mécaniques. La présente partie de la CEI 60974 spécifie les exigences de sécurité et de fonctionnement des sources de courant de soudage et des systèmes de coupage plasma. Cette quatrième édition annule et remplace la troisième édition parue en 2005, et constitue une révision technique. Les modifications majeures par rapport à l'édition précédente sont les suivantes:  - l'essai d échauffement doit être réalisé à une température ambiante de 40 °C (voir 5.1);  - la nouvelle Figure 1 fournit un récapitulatif des exigences d'isolement;  - les lignes de fuite pour le degré de pollution 4 ne sont plus valables (voir Tableau 2);  - les exigences d'isolement pour le matériel de Classe II sont définies (voir Tableau 3);  - la limite inférieure restrictive d'interpolation de la tension d'essai diélectrique est modifiée et passe à 220 V et l'interpolation pour le circuit de commande et de soudage est clarifié (voir Tableau 4);  - l'essai à l'eau est simplifié par la suppression de l'examen visuel (voir 6.2.1);  - les exigences d'isolement du circuit d'alimentation et du circuit de soudage sont transformées en protection contre les chocs électriques en service normal (voir 6.2.4);  - les exigences relatives au courant de contact en service normal et en condition de défaut simple sont modifiées (voir 6.2.5, 6.2.6 et 6.3.6);  - les valeurs de température maximale pour les systèmes d'isolement sont révisées conformément à l'édition actuelle de la CEI 60085 (voir Tableau 6);  - les limites d'échauffement pour les surfaces externes sont mises à jour en fonction de la durée des contacts involontaires, telle que définie dans l'ISO 13732-1 (voir Tableau 7);  - l'essai en charge est complété par un essai diélectrique (voir 7.4);  - l'essai de conformité pour les tolérances aux fluctuations de la tension d'alimentation est clarifié (voir 10.1);  - le marquage des bornes est limité aux bornes des conducteurs de protection externes et des matériels triphasés (voir 10.4);  - l'usage des dispositifs réducteurs de risques est clarifié (voir 11.1);  - les exigences relatives aux circuits de commande sont modifiées (voir l'Article 12);   - l'essai au choc est clarifié (voir 14.2.2);  - les paramètres d'ambiance sont complétés (voir Annexe M).

Naprave za obločno varjenje - 1. del: Viri varilnega toka

Ta del standarda IEC 60974 se uporablja za vire toka za obločno varjenje in z njim povezane postopke, namenjene za profesionalno in industrijsko uporabo, ki se napajajo z napetostjo, manjšo od 1 000 V, ali jih poganjajo mehanska sredstva. Ta del standarda IEC 60974 določa zahteve glede varnosti in zmogljivosti za vire varilnega toka in plazemske rezalne sisteme. Ta del standarda IEC 60974 se ne uporablja za vire varilnega toka za ročno obločno varjenje za omejeno uporabo, ki so namenjeni predvsem za laično uporabo in so oblikovani v skladu s standardom IEC 60974-6. Ta del standarda IEC 60974 se ne uporablja za preskušanje virov toka med periodičnim vzdrževanjem ali po popravilu.

General Information

Status
Withdrawn
Publication Date
20-Sep-2012
Withdrawal Date
07-Oct-2021
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
06-Oct-2021
Due Date
29-Oct-2021
Completion Date
08-Oct-2021

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60974-1:2012
01-oktober-2012
1DSUDYH]DREORþQRYDUMHQMHGHO9LULYDULOQHJDWRND
Arc welding equipment - Part 1: Welding power sources
Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen
Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage
Ta slovenski standard je istoveten z: EN 60974-1:2012
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-1:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60974-1:2012

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SIST EN 60974-1:2012

EUROPEAN STANDARD
EN 60974-1

NORME EUROPÉENNE
August 2012
EUROPÄISCHE NORM

ICS 25.160 Supersedes EN 60974-1:2005


English version


Arc welding equipment -
Part 1: Welding power sources
(IEC 60974-1:2012)


Matériel de soudage à l'arc -  Lichtbogenschweißeinrichtungen -
Partie 1: Sources de courant de soudage Teil 1: Schweißstromquellen
(CEI 60974-1:2012) (IEC 60974-1:2012)





This European Standard was approved by CENELEC on 2012-07-17. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60974-1:2012 E

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SIST EN 60974-1:2012
EN 60974-1:2012 - 2 -
Foreword
The text of document 26/472/FDIS, future edition 4 of IEC 60974-1, prepared by IEC/TC 26, "Electric
welding" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60974-
1:2012.

The following dates are fixed:
(dop) 2013-04-17
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-07-17
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60974-1:2005.
EN 60974-1:2012 includes the following significant technical changes with respect to EN 60974-1:2005:
– the heating test shall be carried out at ambient temperature of 40 °C (see 5.1);
– new Figure 1 summarizes example of insulation requirements;
– creepage distances for pollution degree 4 are no longer valid (see Table 2);
– insulation requirements for Class II equipment are defined (see Table 3);
– dielectric test voltage interpolation restriction lower limit is changed to 220 V and interpolation for control
and welding circuit is clarified (see Table 4);
– water test is clarified by suppression of visual inspection (see 6.2.1);
– isolation requirements of the supply circuit and the welding circuit are moved in protection against
electric shock in normal service (see 6.2.4);
– touch current in normal service and in single fault condition requirements are changed (see 6.2.5, 6.2.6
and 6.3.6);
– maximum temperature for insulation systems are reviewed in accordance with current edition of
EN 60085 (see Table 6);
– limits of temperature rise for external surfaces are updated depending of unintentional contact period as
defined in EN ISO 13732-1 (see Table 7);
– loading test is completed by a dielectric test (see 7.4);
– conformity test for tolerance to supply voltage fluctuation is clarified (see 10.1);
– marking of terminals is limited to external protective conductor and three-phase equipment terminals
(see 10.4);
– usage of hazard reducing device is clarified (see 11.1);
– requirements for control circuits are changed (see Clause 12);
– impact test is clarified (see 14.2.2);
– environmental parameters are completed (see Annex M).
In this standard, the following print types are used:

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SIST EN 60974-1:2012
- 3 - EN 60974-1:2012

– conformity statements: in italic type.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed
for Use within Certain Voltage Limits (LVD - 2006/95/EC)
Endorsement notice
The text of the International Standard IEC 60974-1:2012 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60038:2009 NOTE  Harmonized as EN 60038:2011 (modified).
IEC 60085 NOTE  Harmonized as EN 60085.
IEC 60204-1 NOTE  Harmonized as EN 60204-1.
IEC 60309-1 NOTE  Harmonized as EN 60309-1.
IEC 60950-1 NOTE  Harmonized as EN 60950-1.
IEC 60974-6 NOTE  Harmonized as EN 60974-6.
IEC 60974-10 NOTE  Harmonized as EN 60974-10.
IEC 60974-12 NOTE  Harmonized as EN 60974-12.
IEC 61558-1 NOTE  Harmonized as EN 61558-1.
IEC 62079 NOTE  Harmonized as EN 62079.
ISO 13732-1 NOTE  Harmonized as EN ISO 13732-1

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SIST EN 60974-1:2012
EN 60974-1:2012 - 4 -
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-151 2001 International Electrotechnical Vocabulary - -
(IEV) -
Part 151: Electrical and magnetic devices


IEC 60050-851 2008 International Electrotechnical Vocabulary - - -
Part 851: Electric welding


IEC 60245-6 - Rubber insulated cables - Rated voltages up - -
to and including 450/750 V -
Part 6: Arc welding electrode cables


IEC 60417 Data- Graphical symbols for use on equipment - -
base


IEC 60445 - Basic and safety principles for man-machine EN 60445 -
interface, marking and identification -
Identification of equipment terminals,
conductor terminations and conductors


IEC 60529 - Degrees of protection provided by enclosures - -
(IP Code)


IEC 60664-1 2007 Insulation coordination for equipment within EN 60664-1 2007
low-voltage systems -
Part 1: Principles, requirements and tests


IEC 60664-3 - Insulation coordination for equipment within EN 60664-3 -
low-voltage systems -
Part 3: Use of coating, potting or moulding for
protection against pollution


IEC 60695-11-10 - Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W horizontal and
vertical flame test methods


IEC 60974-7 - Arc welding equipment - EN 60974-7 -
Part 7:Torches


IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment


IEC 61558-2-4 - Safety of transformers, reactors, power supply EN 61558-2-4 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-4: Particular requirements and tests for
isolating transformers and power supply units
incorporating isolating transformers

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SIST EN 60974-1:2012
- 5 - EN 60974-1:2012

Publication Year Title EN/HD Year
IEC 61558-2-6 - Safety of transformers, reactors, power supply EN 61558-2-6 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-6: Particular requirements and tests for
safety isolating transformers and power
supply units incorporating safety isolating
transformers

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SIST EN 60974-1:2012

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SIST EN 60974-1:2012



IEC 60974-1

®


Edition 4.0 2012-06




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Arc welding equipment –

Part 1: Welding power sources




Matériel de soudage à l’arc –

Partie 1: Sources de courant de soudage
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XE


ICS 25.160 ISBN 978-2-83220-095-7



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 9 ----------------------

SIST EN 60974-1:2012
– 2 – 60974-1 © IEC:2012
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references. 9
3 Terms and definitions . 10
4 Environmental conditions . 18
5 Tests . 19
5.1 Test conditions . 19
5.2 Measuring instruments . 19
5.3 Conformity of components . 19
5.4 Type tests . 20
5.5 Routine tests . 20
6 Protection against electric shock . 21
6.1 Insulation . 21
6.1.1 General . 21
6.1.2 Clearances . 22
6.1.3 Creepage distances . 23
6.1.4 Insulation resistance . 25
6.1.5 Dielectric strength . 25
6.2 Protection against electric shock in normal service (direct contact) . 26
6.2.1 Protection provided by the enclosure . 26
6.2.2 Capacitors . 27
6.2.3 Automatic discharge of supply circuit capacitors . 27
6.2.4 Isolation of the welding circuit . 28
6.2.5 Welding circuit touch current . 28
6.2.6 Touch current in normal condition . 29
6.3 Protection against electric shock in case of a fault condition (indirect contact) . 29
6.3.1 Protective provisions . 29
6.3.2 Isolation between windings of the supply circuit and the welding circuit . 29
6.3.3 Internal conductors and connections . 29
6.3.4 Additional requirements for plasma cutting systems . 30
6.3.5 Movable coils and cores . 30
6.3.6 Touch current in fault condition . 31
7 Thermal requirements . 31
7.1 Heating test . 31
7.1.1 Test conditions . 31
7.1.2 Tolerances of the test parameters . 32
7.1.3 Duration of test . 32
7.2 Temperature measurement . 32
7.2.1 Measurement conditions . 32
7.2.2 Surface temperature sensor . 32
7.2.3 Resistance . 33
7.2.4 Embedded temperature sensor . 33
7.2.5 Determination of the ambient air temperature . 33
7.2.6 Recording of temperatures . 33
7.3 Limits of temperature rise . 34

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SIST EN 60974-1:2012
60974-1 © IEC:2012 – 3 –
7.3.1 Windings, commutators and slip-rings . 34
7.3.2 External surfaces . 34
7.3.3 Other components . 35
7.4 Loading test . 35
7.5 Commutators and slip-rings . 36
8 Thermal protection . 36
8.1 General requirements . 36
8.2 Construction . 36
8.3 Location . 36
8.4 Operating capacity . 36
8.5 Operation . 37
8.6 Resetting . 37
8.7 Indication . 37
9 Abnormal operation. 37
9.1 General requirements . 37
9.2 Stalled fan test . 38
9.3 Short circuit test . 38
9.4 Overload test . 38
10 Connection to the supply network . 39
10.1 Supply voltage . 39
10.2 Multi-supply voltage . 39
10.3 Means of connection to the supply circuit . 39
10.4 Marking of terminals . 40
10.5 Protective circuit . 40
10.5.1 Continuity requirement . 40
10.5.2 Type test . 41
10.5.3 Routine test . 41
10.6 Cable anchorage . 42
10.7 Inlet openings . 43
10.8 Supply circuit on/off switching device . 43
10.9 Supply cables . 44
10.10 Supply coupling device (attachment plug). 44
11 Output . 45
11.1 Rated no-load voltage . 45
11.1.1 Rated no-load voltage for use in environments with increased risk of
electric shock . 45
11.1.2 Rated no-load voltage for use in environments without increased risk
of electric shock . 45
11.1.3 Rated no-load voltage for the use with mechanically held torches with
increased protection for the operator . 45
11.1.4 Rated no-load voltage for special processes for example plasma
cutting . 45
11.1.5 Additional requirements . 46
11.1.6 Measuring circuits . 47
11.2 Type test values of the conventional load voltage . 48
11.2.1 Manual metal arc welding with covered electrodes. 48
11.2.2 Tungsten inert gas . 48
11.2.3 Metal inert/active gas and flux cored arc welding . 48
11.2.4 Submerged arc welding . 48

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SIST EN 60974-1:2012
– 4 – 60974-1 © IEC:2012
11.2.5 Plasma cutting . 48
11.2.6 Plasma welding . 48
11.2.7 Plasma gouging . 48
11.2.8 Additional requirements . 48
11.3 Mechanical switching devices used to adjust output . 48
11.4 Welding circuit connections . 49
11.4.1 Protection against unintentional contact . 49
11.4.2 Location of coupling devices . 49
11.4.3 Outlet openings . 49
11.4.4 Three-phase multi-operator welding transformer . 49
11.4.5 Marking . 49
11.4.6 Connections for plasma cutting torches . 50
11.5 Power supply to external devices connected to the welding circuit . 50
11.6 Auxiliary power supply . 50
11.7 Welding cables . 51
12 Control circuits . 51
12.1 General requirement . 51
12.2 Isolation of control circuits . 51
12.3 Working voltages of remote control circuits . 51
13 Hazard reducing device . 51
13.1 General requirements . 51
13.2 Types of hazard reducing devices . 52
13.2.1 Voltage reducing device . 52
13.2.2 Switching device for a.c. to d.c. . 52
13.3 Requirements for hazard reducing devices . 52
13.3.1 Disabling the hazard reducing device . 52
13.3.2 Interference with operation of a hazard reducing device . 52
13.3.3 Indication of satisfactory operation . 53
13.3.4 Fail to a safe condition . 53
14 Mechanical provisions . 53
14.1 General requirements . 53
14.2 Enclosure . 53
14.2.1 Enclosure materials . 53
14.2.2 Enclosure strength . 53
14.3 Handling means . 54
14.3.1 Mechanised handling . 54
14.3.2 Manual handling . 54
14.4 Drop withstand . 55
14.5 Tilting stability . 55
15 Rating plate . 55
15.1 General requirements . 55
15.2 Description . 55
15.3 Contents . 56
15.4 Tolerances . 59
15.5 Direction of rotation . 60
16 Adjustment of the output . 60
16.1 Type of adjustment . 60
16.2 Marking of the adjusting device . 60

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SIST EN 60974-1:2012
60974-1 © IEC:2012 – 5 –
16.3 Indication of current or voltage control . 60
17 Instructions and markings . 61
17.1 Instructions . 61
17.2 Markings . 62
Annex A (informative) Nominal voltages of supply networks . 63
Annex B (informative) Example of a combined dielectric test . 64
Annex C (normative) Unbalanced load in case of a.c. tungsten inert-gas welding power
sources . 65
Annex D (informative) Extrapolation of temperature to time of shutdown . 67
Annex E (normative) Construction of supply circuit terminals . 68
Annex F (informative) Cross-reference to non-SI units . 70
Annex G (informative) Suitability of supply network for the measurement of the true
r.m.s. value of the supply current . 71
Annex H (informative) Plotting of static characteristics . 72
Annex I (normative) Test methods for a 10 Nm impact . 73
Annex J (normative) Thickness of sheet metal for enclosures . 74
Annex K (informative) Examples of rating plates . 76
Annex L (informative) Graphical symbols for arc welding equipment . 81
Annex M (informative) Efficiency . 104
Annex N (normative) Touch current measurement in fault condition . 105
Bibliography . 109

Figure 1 – Example of insulation configuration for Class I equipment . 21
Figure 2 – Measurement of welding circuit touch current .
...

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