Arc welding equipment - Part 6: Limited duty equipment

IEC 60974-6:2010 specifies safety and performance requirements applicable to limited duty arc welding and cutting power sources, and auxiliaries designed for use by laymen. Electrically powered equipment is intended to be connected to the single phase public low-voltage supply system. Engine driven power sources can not exceed output power of 7,5 kVA. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. The main significant technical changes with respect to the previous edition are the following:
- extension of the scope;
- amendment of the title;
- touch current at fault condition (see 6.3.7);
- new definition of thermal requirements based two independent devices, one for thermal protection and one for thermal control (see 7.1);
- new definition for thermal performances at 20 °C (see 7.2);
- thermal safety requirements are based on operating temperature for normal condition and maximum temperature in overload condition (see 7.4);
- addition of abnormal operation test for thermal control device (see 10.4);
- new requirement for auxiliaries (see Clause 16);
- new rating plate definition (see Clause 17);
- introduction of new mandatory warning symbols (see 12.1.117.3, Box 17b) and 19.2);
- induced changes due to publication of IEC 60974-1:2005.
This publication is to be read in conjunction with IEC 60974-1:2005.

Lichtbogenschweißeinrichtungen - Teil 6: Schweißstromquellen mit begrenzter Einschaltdauer

Matériel de soudage à l'arc - Partie 6: Matériel à service limité

La CEI 60974-6:2010 spécifie les exigences de sécurité et de performance qui s'appliquent aux sources de courant de soudage et de coupage à l'arc à service limité et dispositifs externes conçus pour être utilisées par des non professionnels. Le matériel électrique est prévu pour être connecté à un système d'alimentation public à basse tension et monophasé. Les sources de courant de soudage à moteur thermique ne peuvent pas dépasser une puissance de sortie de 7,5 kVA. Cette deuxième édition annule et remplace la première édition parue en 2003. Elle constitue une révision technique. Les modifications techniques majeures par rapport à l'édition précédente sont les suivantes:
- élargissement du domaine d'application;
- changement du titre;
- courant de contact en cas de défaut (voir 6.3.7);
- nouvelle définition des exigences thermiques basée sur deux dispositifs indépendants, l'un pour la protection thermique et l'autre pour la commande thermique (voir 7.1);
- nouvelle définition pour performances thermiques à 20 °C (voir 7.2);
- les exigences pour la sécurité thermique sont basées sur la température de fonctionnement à l'état normal et la température maximale à l'état de surcharge (voir 7.4);
- ajout de l'essai de fonctionnement anormal des dispositifs de commande thermique (voir 10.4);
- nouvelle exigence pour les dispositifs auxiliaires (voir Article 16);
- nouvelle plaque signalétique (voir Article 17);
- introduction de nouveaux symboles d'avertissement obligatoires (voir 12.1.1, 17.3, case 17b) et 19.2);
- modifications induites en fonction de la pubilcation de la CEI 60974-1:2005.
Cette publication doit être lue conjointement avec la CEI 60974-1:2005.

Oprema za obločno varjenje - 6. del: Oprema za omejeno uporabo (IEC 60974-6:2010)

Ta del IEC 60974 določa varnostne zahteve in izvedbene zahteve, ki veljajo za obločno varjenje z omejeno uporabo in vire rezalne moči ter za dodatno opremo, načrtovano za uporabo laikov. Električno gnana oprema je namenjena povezavi z enofaznim javnim oskrbovalnim sistemom nizke napetosti. Gnani viri električne energije ne smejo preseči izhodne moči 7,5 kVA. Ta del IEC 60974 ne velja za vire obločnega varjenja in rezalno moč, ki jo potrebujejo za delovanje: – naprave za obločno varjenje in stabiliziranje; – sistemi za hlajenje s tekočino; – plinske konzole; – trifazna vhodna oskrba in tisti, namenjene le industrijski in strokovni uporabi. Ta del IEC 60974 ne velja za vire obločnega varjenja in rezalno moč ter pomožno opremo, ki se uporablja pri: – mehansko vodenih uporabah; – postopku obločnega varjenje pod praškom; – plazemskem postopku žlebljenja; – postopku plazemskega varjenja; ti so zajeti v drugih delih IEC 60974.

General Information

Status
Withdrawn
Publication Date
13-Jan-2011
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Completion Date
14-Jan-2011

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SLOVENSKI STANDARD
SIST EN 60974-6:2011
01-marec-2011
1DGRPHãþD
SIST EN 60974-6:2003
2SUHPD]DREORþQRYDUMHQMHGHO2SUHPD]DRPHMHQRXSRUDER ,(&

Arc welding equipment - Part 6: Limited duty equipment (IEC 60974-6:2010)
Lichtbogenschweißeinrichtungen - Teil 6: Schweißstromquellen mit begrenzter
Einschaltdauer (IEC 60974-6:2010)

Matériel de soudage à l'arc - Partie 6: Matériel à service limité (CEI 60974-6:2010)

Ta slovenski standard je istoveten z: EN 60974-6:2011
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-6:2011 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60974-6:2011
---------------------- Page: 2 ----------------------
SIST EN 60974-6:2011
EUROPEAN STANDARD
EN 60974-6
NORME EUROPÉENNE
January 2011
EUROPÄISCHE NORM
ICS 25.160.30 Supersedes EN 60974-6:2003 + corr. May.2005
English version
Arc welding equipment -
Part 6: Limited duty equipment
(IEC 60974-6:2010)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 6: Matériel à service limité Teil 6: Schweißstromquellen mit
(CEI 60974-6:2010) begrenzter Einschaltdauer
(IEC 60974-6:2010)

This European Standard was approved by CENELEC on 2011-01-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,

Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland 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

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-6:2011 E
---------------------- Page: 3 ----------------------
SIST EN 60974-6:2011
EN 60974-6:2011 - 2 -
Foreword

The text of document 26/429/FDIS, future edition 2 of IEC 60974-6, prepared by IEC TC 26, Electric

welding, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as

EN 60974-6 on 2011-01-01.
This European Standard supersedes EN 60974-6:2003 + corr. May.2005.

The main significant technical changes with respect to EN 60974-6:2003 + corr. May.2005 are the

following:
– extension of the scope;
– amendment of the title;
– touch current at fault condition (see 6.3.7);

– new definition of thermal requirements based two independent devices, one for thermal protection and

one for thermal control (see 7.1);
– new definition for thermal performances at 20 °C (see 7.2);

– thermal safety requirements are based on operating temperature for normal condition and maximum

temperature in overload condition (see 7.4);
– addition of abnormal operation test for thermal control device (see 10.4);
– new requirement for auxiliaries (see Clause 16);
– new rating plate definition (see Clause 17);

– introduction of new mandatory warning symbols (see 12.1.117.3, Box 17b) and 19.2);

– induced changes due to publication of EN 60974-1:2005.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent

rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-10-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-01-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60974-6:2010 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 60127-1 NOTE Harmonized as EN 60127-1.
IEC 60269-1 NOTE Harmonized as EN 60269-1.
IEC 61558-1:2009 NOTE Harmonized as EN 61558-1:2009 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 60974-6:2011
- 3 - EN 60974-6:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

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 60529 - Degrees of protection provided by enclosures EN 60529 -
(IP Code)
IEC 60974-1 2005 Arc welding equipment - EN 60974-1 2005
Part 1: Welding power sources
IEC 60974-5 - Arc welding equipment - EN 60974-5 -
Part 5: Wire feeders
IEC 60974-7 - Arc welding equipment - EN 60974-7 -
Part 7:Torches
IEC 60974-10 - Arc welding equipment - EN 60974-10 -
Part 10: Electromagnetic compatibility (EMC)
requirements
IEC 60974-11 - Arc welding equipment - EN 60974-11 -
Part 11: Electrode holders
IEC 61032 1997 Protection of persons and equipment by EN 61032 1998
enclosures - Probes for verification
ISO 2503 - Gas welding equipment - Pressure regulators - -
and pressure regulators with flow-metering
devices for gas cylinders used in welding,
cutting and allied processes up to 300 bar (30
MPa)
---------------------- Page: 5 ----------------------
SIST EN 60974-6:2011
---------------------- Page: 6 ----------------------
SIST EN 60974-6:2011
IEC 60974-6
Edition 2.0 2010-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Arc welding equipment –
Part 6: Limited duty equipment
Matériel de soudage à l’arc –
Partie 6: Matériel à service limité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 25.160.30 ISBN 978-2-88912-265-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60974-6:2011
– 2 – 60974-6 Ó IEC:2010
CONTENTS

FOREW ORD .................................................................................................................. 6

1 Sc o pe ...................................................................................................................... 8

2 Normative references ................................................................................................ 8

3 Terms and definitions ................................................................................................ 9

4 Environmental conditions......................................................................................... 10

5 Tests ..................................................................................................................... 10

5.1 Test conditions .............................................................................................. 10

5.2 Measuring instruments.................................................................................... 10

5.3 Conformity of components............................................................................... 10

5.4 Type tests ..................................................................................................... 10

5.5 Routine tests ................................................................................................. 11

6 Protection against electric shock .............................................................................. 11

6.1 Insulation ...................................................................................................... 11

6.1.1 General .............................................................................................. 11

6.1.2 Clearances ......................................................................................... 11

6.1.3 Creepage distances............................................................................. 11

6.1.4 Insulation resistance............................................................................ 12

6.1.5 Dielectric strength ............................................................................... 12

6.2 Protection against electric shock in normal service (direct contact)...................... 12

6.2.1 Protection provided by the enclosure ..................................................... 12

6.2.2 Capacitors .......................................................................................... 12

6.2.3 Automatic discharge of input capacitors ................................................. 13

6.3 Protection against electric shock in case of a fault condition (indirect contact) ...... 13

6.3.1 Protective provisions ........................................................................... 13

6.3.2 Isolation of the supply circuit and the welding circuit ............................... 13

6.3.3 Insulation between windings of the supply circuit and the welding

circuit ................................................................................................. 13

6.3.4 Internal conductors and connections ..................................................... 13

6.3.5 Additional requirements for plasma cutting systems ................................ 13

6.3.6 Movable coils and cores....................................................................... 13

6.3.7 Touch current in fault condition ............................................................. 13

7 Thermal requirements ............................................................................................. 15

7.1 Devices for thermal protection and thermal control ............................................ 15

7.2 Heating test ................................................................................................... 15

7.2.1 Test conditions ................................................................................... 15

7.2.2 Tolerances of the test parameters ......................................................... 15

7.2.3 Rated maximum welding current ........................................................... 15

7.2.4 Calculation ......................................................................................... 16

7.3 Temperature measurement ............................................................................. 16

7.3.1 Measurement condition ........................................................................ 16

7.3.2 Surface temperature sensor ................................................................. 16

7.3.3 Resistance ......................................................................................... 16

7.3.4 Embedded temperature sensor ............................................................. 16

7.3.5 Determination of the ambient air temperature ......................................... 16

7.3.6 Recording of temperatures ................................................................... 16

7.4 Limits of temperature ...................................................................................... 16

---------------------- Page: 8 ----------------------
SIST EN 60974-6:2011
60974-6 Ó IEC:2010 – 3 –

7.4.1 Windings, commutators and slip-rings ................................................... 16

7.4.2 External surfaces ................................................................................ 17

7.4.3 Other components ............................................................................... 17

7.5 Loading test .................................................................................................. 17

7.6 Commutators and slip-rings ............................................................................. 17

8 Thermal control device ............................................................................................ 18

8.1 Construction .................................................................................................. 18

8.2 Location ........................................................................................................ 18

8.3 Operation ...................................................................................................... 18

8.4 Resetting ...................................................................................................... 18

8.5 Operating capacity ......................................................................................... 18

8.6 Indication ...................................................................................................... 18

9 Thermal protection .................................................................................................. 19

9.1 Construction .................................................................................................. 19

9.2 Location ........................................................................................................ 19

9.3 Operation ...................................................................................................... 19

10 Abnormal operation ................................................................................................ 19

10.1 General requirements ..................................................................................... 19

10.2 Stalled fan test............................................................................................... 20

10.3 Short circuit test ............................................................................................. 20

10.4 Overload test ................................................................................................. 20

11 Connection to the input supply network ..................................................................... 20

11.1 Input supply ................................................................................................... 20

11.1.1 Supply voltage .................................................................................... 20

11.1.2 Supply current .................................................................................... 20

11.1.3 Engine driven welding power source ..................................................... 20

11.2 Multi supply voltage ........................................................................................ 21

11.3 Means of connection to the supply circuit ......................................................... 21

11.4 Supply circuit terminals ................................................................................... 21

11.5 Cable anchorage ............................................................................................ 21

11.6 Inlet openings ................................................................................................ 21

11.7 Supply circuit on/off switching device ............................................................... 21

11.8 Supply cables ................................................................................................ 21

11.9 Supply coupling device (attachment plug) ......................................................... 21

12 Output ................................................................................................................... 22

12.1 Rated no-load voltage .................................................................................... 22

12.1.1 Rated no-load voltage for arc welding power source ............................... 22

12.1.2 Rated no-load voltage for plasma cutting power source ........................... 22

12.1.3 Additional requirements ....................................................................... 23

12.1.4 Measuring circuit ................................................................................. 23

12.2 Type test values of the conventional load voltage .............................................. 25

12.2.1 Manual metal arc welding with covered electrodes .................................. 25

12.2.2 Tungsten inert gas .............................................................................. 25

12.2.3 Metal inert/active gas and flux cored arc welding .................................... 25

12.2.4 Plasma cutting .................................................................................... 25

12.2.5 Additional requirements ....................................................................... 25

12.3 Mechanical switching devices used to adjust output ........................................... 25

12.4 Welding circuit connections ............................................................................. 25

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SIST EN 60974-6:2011
– 4 – 60974-6 Ó IEC:2010

12.4.1 Protection against unintentional contact ................................................ 25

12.4.2 Location of coupling devices ................................................................ 25

12.4.3 Outlet openings................................................................................... 25

12.4.4 Marking .............................................................................................. 25

12.4.5 Connections for plasma cutting torches ................................................. 25

12.5 Power supply to external devices ..................................................................... 25

12.6 Auxiliary power output .................................................................................... 26

12.7 Welding cables .............................................................................................. 26

13 Control circuits ....................................................................................................... 26

14 Hazard reducing device ........................................................................................... 26

15 Mechanical provisions ............................................................................................. 27

15.1 General requirements ..................................................................................... 27

15.2 Enclosure ...................................................................................................... 27

15.2.1 Enclosure materials ............................................................................. 27

15.2.2 Enclosure strength .............................................................................. 27

15.3 Handling means ............................................................................................. 27

15.4 Drop withstand ............................................................................................... 27

15.5 Tilting stability ............................................................................................... 27

16 Auxiliaries .............................................................................................................. 27

16.1 General ......................................................................................................... 27

16.2 Wire feeder ................................................................................................... 27

16.2.1 General .............................................................................................. 27

16.2.2 Test conditions ................................................................................... 27

16.2.3 Thermal requirements .......................................................................... 27

16.2.4 Protection against unintentional contact ................................................ 27

16.3 Torch ............................................................................................................ 28

16.3.1 General .............................................................................................. 28

16.3.2 Test conditions ................................................................................... 28

16.3.3 Thermal requirements .......................................................................... 28

16.4 Electrode holder............................................................................................. 28

16.5 Pressure regulator ......................................................................................... 28

17 Rating plate ........................................................................................................... 28

17.1 General requirements ..................................................................................... 28

17.2 Description .................................................................................................... 28

17.3 Contents ....................................................................................................... 29

17.4 Tolerances .................................................................................................... 31

18 Adjustment of the output ......................................................................................... 31

19 Instructions and markings ........................................................................................ 31

19.1 Instructions ................................................................................................... 31

19.1.1 General .............................................................................................. 31

19.1.2 Instruction manual ............................................................................... 32

19.1.3 Safety instructions ............................................................................... 32

19.2 Markings ....................................................................................................... 33

Annex A (informative) Test probes ................................................................................ 34

Annex B (informative) Examples of rating plates ............................................................. 35

Annex C (informative) Symbols-only precautionary label .................................................. 36

Bibliography ................................................................................................................. 37

---------------------- Page: 10 ----------------------
SIST EN 60974-6:2011
60974-6 Ó IEC:2010 – 5 –

Figure 1 – Measurement of touch current in fault condition ............................................... 14

Figure 2 – Measuring network for weighted touch current ................................................. 14

Figure 3 – Measurement of r.m.s values ......................................................................... 24

Figure 4 – Measurement of peak values .......................................................................... 24

Figure 5 – Principle of the rating plate ............................................................................ 29

Figure A.1 – Test probe 12 of IEC 61032 ........................................................................ 34

Figure A.2 – Test probe 13 of IEC 61032 ........................................................................ 34

Figure B.1 – Rating plate ............................................................................................... 35

Figure C.1 – Example of precautionary label for engine driven manual metal arc

welding power sourceBibliography ................................................................................. 36

Table 1 – Temperature limits according to the class of insulation....................................... 17

Table 2 – Summary of rated no-load voltages .................................................................. 23

Table 3 – Hazard reducing device requirements for plasma cutting power source ................ 26

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SIST EN 60974-6:2011
– 6 – 60974-6 Ó IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 6: Limited duty equipment
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 60974-6 has been prepared by IEC technical committee 26:

Electric welding.

This second edition cancels and replaces the first edition published in 2003. It constitutes a

technical revision.

The main significant technical changes with respect to the previous edition are the following:

– extension of the scope;
– amendment of the title;
– touch current at fault condition (see 6.3.7);

– new definition of thermal requirements based two independent devices, one for thermal

protection and one for thermal control (see 7.1);
– new definition for thermal performances at 20 °C (see 7.2);

– thermal safety requirements are based on operating temperature for normal condition and

maximum temperature in overload condition (see 7.4);
---------------------- Page: 12 ----------------------
SIST EN 60974-6:2011
60974-6 Ó IEC:2010 – 7 –
– addition of abnormal operation test for thermal control device (see 10.4);
– new requirement for auxiliaries (see Clause 16);
– new rating plate definition (see Clause 17);

– introduction of new mandatory warning symbols (see 12.1.117.3, Box 17b) and 19.2);

– induced changes due to publication of IEC 60974-1:2005.
The text of this standard is based on the following documents:
FDIS Report on voting
26/429/FDIS 26/437/RVD
Full information on the voting for the approval of this standa
...

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