Arc welding equipment - Part 1: Welding power sources

Is applicable to power sources for arc welding and allied processes designed for industrial and professional use. Specifies safety and performance requirements of welding power sources and plasma cutting systems.

Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen

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

S'applique aux sources de courant de soudage à l'arc et techniques connexes conçues pour un usage industriel et professionnel. Spécifie les exigences de sécurité et de fonctionnement des sources de courant de soudage et des systèmes de coupage plasma.

Naprave za obločno varjenje - 1. del: Viri varilnega toka (IEC 60974-1:2005)

General Information

Status
Withdrawn
Publication Date
18-Oct-2005
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Due Date
19-Oct-2005
Completion Date
19-Oct-2005

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SLOVENSKI STANDARD
SIST EN 60974-1:2005
01-december-2005
1DGRPHãþD
SIST EN 60974-1:2000
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 60974-1:2005
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-1:2005 en

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

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SIST EN 60974-1:2005
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SIST EN 60974-1:2005
EUROPEAN STANDARD EN 60974-1
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2005
ICS 25.160 Supersedes EN 60974-1:1998 + A1:2000 + A2:2003
English version
Arc welding equipment
Part 1: Welding power sources
(IEC 60974-1:2005)
Matériel de soudage à l'arc Lichtbogenschweißeinrichtungen
Partie 1: Sources de courant de soudage Teil 1: Schweißstromquellen
(CEI 60974-1:2005) (IEC 60974-1:2005)

This European Standard was approved by CENELEC on 2005-10-01. 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, Cyprus, Czech

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

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-1:2005 E
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SIST EN 60974-1:2005
EN 60974-1:2005 - 2 -
Foreword

The text of document 26/307/FDIS, future edition 3 of IEC 60974-1, prepared by IEC TC 26, Electric

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

EN 60974-1 on 2005-10-01.
This European Standard supersedes EN 60974-1:1998 + A1:2000 + A2:2003.
The significant changes with respect to EN 60974-1:1998 are the following:
– the scope includes relationship to other parts of EN 60974;
– environmental conditions were changed (see 4.a and 4.e);
– conformity of components is given (see 5.3);
– the sequence of type test was changed (see 5.4);

– more precise requirements for measuring the no-load voltage during routine test are given

(see 5.5d);
– creepage values for printed circuit boards are implemented (see Table 2);
– requirements for enclosures are changed (see 6.2.1);
– requirements for primary leakage current are included (see 6.3.7 and Annex N);

– requirements for engine driven power sources are changed (see 7.1.2 and 7.3.2);

– requirements for supply circuit terminals are changed (see 10.4.3 and 10.4.4);
– requirements for cable anchorage are changed (see 10.5);
– requirements for coupling devices are changed (see 10.9);
– standard characteristic for plasma welding is included (11.2.6);
– requirements for welding cables are added (see 11.7);

– requirements for plastic material used as enclosure materials are added (see 14.2.1);

– requirements for manual handling are added (see 14.3.2);
– existing ISO symbols and labels are taken into account (see 15.3 and 17.2).
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-10-01
Annex ZA has been added by CENELEC.
__________
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SIST EN 60974-1:2005
- 3 - EN 60974-1:2005
Endorsement notice

The text of the International Standard IEC 60974-1:2005 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 60085 NOTE Harmonized as EN 60085:2004 (not modified).
IEC 60204-1 NOTE Harmonized as EN 60204-1:1997 (not modified).
IEC 62079 NOTE Harmonized as EN 62079:2001 (not modified).
IEC 62081 NOTE Harmonized as CLC/TS 62081:2002 (not modified).
__________
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SIST EN 60974-1:2005
EN 60974-1:2005 - 4 -
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60038 (mod) - Nominal voltages for low-voltage public HD 472 S1 1989
electricity supply systems + corr. February 2002
IEC 60050-151 - International Electrotechnical - -
Vocabulary (IEV)
Part 151: Electrical and magnetic
devices
IEC 60050-851 - Chapter 851: Electric welding - -
1) 2)
IEC 60112 - Method for the determination of the EN 60112 2003
proof and the comparative tracking
indices of solid insulating materials
IEC 60245-6 - Rubber insulated cables - Rated - -
voltages up to and including 450/750 V
Part 6: Arc welding electrode cables
1) 2)
IEC 60309-1 - Plugs, socket-outlets and couplers for EN 60309-1 1999
industrial purposes + A11 2004
Part 1: General requirements
database
IEC 60417 Graphical symbols for use on - -
equipment
1) 2)
IEC 60445 - Basic and safety principles for man- EN 60445 2000
machine interface, marking and
identification - Identification of
equipment terminals and of terminations
of certain designated conductors,
including general rules for an
alphanumeric system
1) 2)
IEC 60529 - Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
Undated reference.
Valid edition at date of issue.
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SIST EN 60974-1:2005
- 5 - EN 60974-1:2005
Publication Year Title EN/HD Year
IEC 60664-1 1992 Insulation coordination for equipment
within low-voltage systems
Part 1: Principles, requirements and
tests
+ A1 2000
+ A2 2002 EN 60664-1 2003
1) 2)
IEC 60664-3 - Part 3: Use of coating, potting or EN 60664-3 2003
moulding for protection against pollution
1) 2)
IEC 60695-11-10 - Fire hazard testing EN 60695-11-10 1999
Part 11-10: Test flames - 50 W
horizontal and vertical flame test
methods
1) 2)
IEC 60974-7 - Arc welding equipment EN 60974-7 2005
Part 7:Torches
1) 2)
IEC 60974-12 - Part 12: Coupling devices for welding EN 60974-12 2005
cables
1) 2)
IEC 61140 - Protection against electric shock - EN 61140 2002
Common aspects for installation and
equipment
1) 2)
IEC 61558-2-4 - Safety of power transformers, power EN 61558-2-4 1997
supply units and similar
Part 2-4: Particular requirements for
isolating transformers for general use
1) 2)
IEC 61558-2-6 - Part 2-6: Particular requirements for EN 61558-2-6 1997
safety isolating transformers for general
use
1) 2)
CISPR 11 (mod) - Industrial, scientific and medical (ISM) EN 55011 1998
radio-frequency equipment - Radio
disturbance characteristics - Limits and
methods of measurement
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SIST EN 60974-1:2005
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SIST EN 60974-1:2005
NORME CEI
INTERNATIONALE
IEC
60974-1
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2005-07
Matériel de soudage à l'arc –
Partie 1:
Sources de courant de soudage
Arc welding equipment –
Part 1:
Welding power sources
 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any

utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including

électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from

microfilms, sans l'accord écrit de l'éditeur. the publisher.

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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

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---------------------- Page: 9 ----------------------
SIST EN 60974-1:2005
60974-1  IEC:2005 – 3 –
CONTENTS

FOREWORD.........................................................................................................................11

1 Scope.............................................................................................................................17

2 Normative references......................................................................................................17

3 Terms and definitions .....................................................................................................19

4 Environmental conditions ................................................................................................33

5 Tests ..............................................................................................................................35

5.1 Test conditions ......................................................................................................35

5.2 Measuring instruments...........................................................................................35

5.3 Conformity of components .....................................................................................35

5.4 Type tests .............................................................................................................37

5.5 Routine tests .........................................................................................................37

6 Protection against electric shock.....................................................................................39

6.1 Insulation...............................................................................................................39

6.2 Protection against electric shock in normal service (direct contact).........................47

6.3 Protection against electric shock in case of a fault condition (indirect contact) ........51

7 Thermal requirements.....................................................................................................59

7.1 Heating test ...........................................................................................................59

7.2 Temperature measurement....................................................................................59

7.3 Limits of temperature rise ......................................................................................63

7.4 Loading test...........................................................................................................67

7.5 Commutators and slip-rings ...................................................................................67

8 Abnormal operation.........................................................................................................67

8.1 General requirements ............................................................................................67

8.2 Stalled fan test ......................................................................................................69

8.3 Short circuit test ....................................................................................................69

8.4 Overload test.........................................................................................................71

9 Thermal protection..........................................................................................................71

9.1 General requirements ............................................................................................71

9.2 Construction ..........................................................................................................71

9.3 Location ................................................................................................................71

9.4 Operation ..............................................................................................................73

9.5 Resetting...............................................................................................................73

9.6 Operating capacity.................................................................................................73

9.7 Indication...............................................................................................................73

10 Connection to the input supply network ...........................................................................75

10.1 Supply voltage .......................................................................................................75

10.2 Multi supply voltage ...............................................................................................75

10.3 Means of connection to the supply circuit ...............................................................75

10.4 Supply circuit terminals..........................................................................................77

10.5 Cable anchorage ...................................................................................................81

10.6 Inlet openings ........................................................................................................83

10.7 Supply circuit on/off switching device .....................................................................83

10.8 Supply cables ........................................................................................................85

10.9 Supply coupling device (attachment plug)...............................................................85

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SIST EN 60974-1:2005
60974-1  IEC:2005 – 5 –

11 Output ............................................................................................................................87

11.1 Rated no-load voltage............................................................................................87

11.2 Type test values of the conventional load voltage...................................................93

11.3 Mechanical switching devices used to adjust output ...............................................95

11.4 Welding circuit connections ...................................................................................95

11.5 Power supply to external devices ...........................................................................97

11.6 Auxiliary power output............................................................................................97

11.7 Welding cables ......................................................................................................99

12 Control circuits ...............................................................................................................99

13 Hazard reducing device ..................................................................................................99

13.1 General requirements ............................................................................................99

13.2 Voltage reducing device....................................................................................... 101

13.3 Switching device for a.c. to d.c............................................................................. 101

13.4 Disabling the hazard reducing device ................................................................... 101

13.5 Interference with operation of a hazard reducing device ....................................... 101

13.6 Indication of satisfactory operation....................................................................... 101

13.7 Fail to a safe condition......................................................................................... 103

14 Mechanical provisions................................................................................................... 103

14.1 General requirements .......................................................................................... 103

14.2 Enclosure ............................................................................................................ 103

14.3 Handling means................................................................................................... 105

14.4 Drop withstand .................................................................................................... 107

14.5 Tilting stability ..................................................................................................... 107

15 Rating plate .................................................................................................................. 107

15.1 General requirements .......................................................................................... 107

15.2 Description .......................................................................................................... 109

15.3 Contents.............................................................................................................. 111

15.4 Tolerances .......................................................................................................... 117

15.5 Direction of rotation ............................................................................................. 117

16 Adjustment of the output ............................................................................................... 117

16.1 Type of adjustment .............................................................................................. 117

16.2 Marking of the adjusting device............................................................................ 117

16.3 Indication of current or voltage control ................................................................. 119

17 Instructions and markings ............................................................................................. 119

17.1 Instructions.......................................................................................................... 119

17.2 Markings ............................................................................................................. 123

Annex A (informative) Nominal voltages of supply networks................................................. 125

Annex B (informative) Example of a combined dielectric test ............................................... 127

Annex C (normative) Unbalanced load in case of a.c. tungsten inert-gas welding power

sources............................................................................................................................... 129

Annex D (informative) Extrapolation of temperature to time of shutdown .............................. 133

Annex E (normative) Construction of supply circuit terminals ............................................... 135

Annex F (informative) Cross-reference to non-SI units......................................................... 139

Annex G (informative) Suitability of supply network for the measurement of the true

r.m.s. value of the supply current......................................................................................... 141

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SIST EN 60974-1:2005
60974-1  IEC:2005 – 7 –

Annex H (informative) Plotting of static characteristics......................................................... 143

Annex I (normative) Test methods for a 10 Nm impact......................................................... 145

Annex J (normative) Thickness of sheet metal for enclosures .............................................. 147

Annex K (informative) Examples of rating plates.................................................................. 151

Annex L (informative) Graphical symbols for arc welding equipment .................................... 159

Annex M (informative) Efficiency ......................................................................................... 203

Annex N (normative) Primary leakage current measurement................................................ 205

Bibliography ........................................................................................................................ 209

Figure 1 – Measurement of leakage current of welding circuit ................................................53

Figure 2 – Measuring network for primary leakage current .....................................................57

Figure 3 – Measurement of peak values ................................................................................91

Figure 4 – Principle of the rating plate ................................................................................. 109

Figure B.1 – Combined high-voltage transformers ............................................................... 127

Figure C.1 – Voltage and current during a.c. tungsten inert-gas welding............................... 129

Figure C.2 – Unbalanced voltage during a.c. tungsten inert-gas welding .............................. 131

Figure C.3 – AC welding power source with unbalanced load ............................................... 131

Figure I.1 – Test set-up ....................................................................................................... 145

Figure K.1 – Single-phase transformer ................................................................................ 151

Figure K.2 – Three-phase rotating frequency converter........................................................ 153

Figure K.3 – Subdivided rating plate: single-/three-phase transformer rectifier ..................... 155

Figure K.4 – Engine-generator-rectifier................................................................................ 157

Figure L.1 – Input voltage power switch ............................................................................... 199

Figure L.2 – Arc force control potentiometer ........................................................................ 199

Figure L.3 – Remote receptacle and selector switches......................................................... 199

Figure L.4 – Terminals with inductance selector for MIG/MAG welding................................. 199

Figure L.5 – Process switch (MMA, TIG, MIG) ..................................................................... 201

Figure L.6 – Selector switch on AC/DC equipment ............................................................... 201

Figure L.7 – Panel indicator lights (overheat, fault, arc striking, output voltage).................... 201

Figure L.8 – Setting pulsing parameters using digital display................................................ 201

Figure N.1 – Diagram for leakage current meaurement at operating temperature for

single-phase connection of appliances other than those of class II....................................... 205

Figure N.2 – Diagram for leakage current meaurement at operating temperature for

three-phase connection of appliances other than those of class II........................................ 205

Figure N.3 – Diagram for leakage current measurement at operating temperature for

single-phase connection of class II appliances..................................................................... 207

Figure N.4 – Diagram for leakage current measurement at operating temperature for

three-phase connection of class II appliances...................................................................... 207

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SIST EN 60974-1:2005
60974-1  IEC:2005 – 9 –

Table 1 – Minimum clearances for overvoltage category III ....................................................39

Table 2 – Minimum creepage distances.................................................................................43

Table 3 – Insulation resistance ..............................................................................................45

Table 4 – Dielectric test voltages...........................................................................................45

Table 5 – Minimum distance through insulation......................................................................53

Table 6 – Limits of temperature rise for windings, commutators and slip-rings .......................63

Table 7 – Limits of temperature rise for external surfaces......................................................65

Table 8 – Cross-section of the output short-circuit conductor .................................................69

Table 9 – Current and time requirements for protective circuits..............................................79

Table 10 – Minimum cross-sectional area of the external protective copper conductor ...........79

Table 11 – Verification of continuity of the protective bonding circuit ......................................81

Table 12 – Pull......................................................................................................................83

Table 13 – Summary of allowable rated no-load voltages.......................................................91

Table 14 – Hazard reducing device requirements................................................................. 101

Table E.1 – Range of conductor dimensions to be accepted by the supply circuit

terminals............................................................................................................................. 135

Table E.2 – Spacing between supply circuit terminals .......................................................... 137

Table F.1 – Cross-reference for mm to American wire gauge (AWG) ................................. 139

Table F.2 – Cross reference for kW to horsepower (hp)....................................................... 139

Table I.1 – Mass of the free fall weight and height of the free fall ......................................... 145

Table J.1 – Minimum thickness of sheet metal for steel enclosures...................................... 147

Table J.2 – Minimum thickness of sheet metal for enclosures of aluminium, brass or

copper ................................................................................................................................ 149

Table L.1 – Letters used as symbols ................................................................................... 161

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SIST EN 60974-1:2005
60974-1  IEC:2005 – 11 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 1: Welding power sources
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 techni

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