Arc welding equipment - Part 1: Welding power sources (IEC 60974-1:2017)

IEC 60974-1:2012 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 fourth edition cancels and replaces the third edition published in 2005 and constitutes a technical revision. The significant changes with respect to the previous edition are the following:  - 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5.1);  - new Figure 1 summarizes example of insulation requirements;  - creepage distances for pollution degree 4 are no longer valid (see Table 2);  - insulation requirements for Class II equipment are defined (see Table 3);  - dielectric test voltage interpolation restriction lower limit is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 IEC 60085 (see Table 6);  - limits of temperature rise for external surfaces are updated depending of unintentional contact period as defined in 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).

Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen (IEC 60974-1:2017)

Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage (IEC 60974-1:2017)

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 (IEC 60974-1:2017)

Ta del standarda IEC 60974-1:2012 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 1000 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 četrta izdaja razveljavlja in nadomešča tretjo izdajo, objavljeno leta 2005, in predstavlja tehnično popravljeno izdajo. Pomembne spremembe glede na predhodno različico:  – preskus segrevanja je treba izvesti pri temperaturi okolice 40 ° C (glej 5.1); – nova Slika 1 povzema primer zahtev glede izolacije; – plazilne razdalje za stopnjo onesnaženosti 4 niso več veljavne (glej preglednico 2); – podane so zahteve glede izolacije opreme razreda II (glej preglednico 3); – spodnja omejitvena vrednost napetostne interpolacije pri dielektričnih preskusih je spremenjena v 220 V in pojasnjena je interpolacija za kontrolni in varilni tokokrog (glej preglednico 4); – vodni preskus je pojasnjen z zadušitvijo vizualnega pregleda (glej 6.2.1); –zahteve glede izolacije napajalnega tokokroga in varilnega tokokroga so premaknjene v zaščito pred električnim udarom pri običajni uporabi (glej 6.2.4); – spremenjene so zahteve glede toka dotika pri običajni uporabi in v razmerah posamične okvare (glej 6.2.5, 6.2.6 in 6.3.6); – največje temperaturne vrednosti za izolacijske sisteme so revidirane v skladu s trenutno izdajo standarda IEC 60085 (glej preglednico 6); – omejitve povečevanja temperature za zunanje površine so posodobljene glede na obdobje nenamernega stika, kot je opredeljeno v standardu ISO 13732-1 (glej preglednico 7); – preskus obremenitve se konča z dielektričnim preskusom (glej 7.4); – pojasnjen je preskus skladnosti za tolerance pri nihanjih napajalne napetosti (glej 10.1); – označevanje priključkov je omejeno na zunanji zaščitni prevodnik in trifazne priključke opreme (glej 10.4); – pojasnjena je uporaba naprave za zmanjševanje nevarnosti (glej 11.1); – spremenjene so zahteve za krmilna vezja (glej točko 12); – pojasnjen je udarni preskus (glej 14.2.2); – dokončani so okoljski parametri (glej dodatek M).

General Information

Status
Published
Publication Date
07-Oct-2018
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Oct-2018
Due Date
09-Dec-2018
Completion Date
08-Oct-2018

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SLOVENSKI STANDARD
SIST EN IEC 60974-1:2018
01-december-2018
1DGRPHãþD
SIST EN 60974-1:2012
1DSUDYH]DREORþQRYDUMHQMHGHO9LULYDULOQHJDWRND ,(&
Arc welding equipment - Part 1: Welding power sources (IEC 60974-1:2017)
Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen (IEC 60974-1:2017)

Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage (IEC 60974-

1:2017)
Ta slovenski standard je istoveten z: EN IEC 60974-1:2018
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN IEC 60974-1:2018 en

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

---------------------- Page: 1 ----------------------
SIST EN IEC 60974-1:2018
---------------------- Page: 2 ----------------------
SIST EN IEC 60974-1:2018
EUROPEAN STANDARD EN IEC 60974-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 25.160 Supersedes EN 60974-1:2012
English Version
Arc welding equipment - Part 1: Welding power sources
(IEC 60974-1:2017)

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

de soudage Schweißstromquellen
(IEC 60974-1:2017) (IEC 60974-1:2017)

This European Standard was approved by CENELEC on 2018-07-15. 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, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60974-1:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60974-1:2018
EN IEC 60974-1:2018 (E)
European foreword

The text of document 26/610/FDIS, future edition 5 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 IEC 60974-1:2018.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-03-28

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2021-09-28

document have to be withdrawn
This document supersedes EN 60974-1:2012.

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

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

Endorsement notice

The text of the International Standard IEC 60974-1:2017 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 60335-2-29 NOTE Harmonized as EN 60335-2-29
IEC 60384-14 NOTE Harmonized as EN 60384-14
IEC 60950-1 NOTE Harmonized as EN 60950-1
IEC 60974-3 NOTE Harmonized as EN 60974-3
IEC 60974-4 NOTE Harmonized as EN 60974-4
IEC 60974-6 NOTE Harmonized as EN 60974-6
IEC 60974-9 NOTE Harmonized as EN IEC 60974-9
IEC 60974-10 NOTE Harmonized as EN 60974-10
IEC 60974-12 NOTE Harmonized as EN 60974-12
IEC 61032:1997 NOTE Harmonized as EN 61032:1998 (not modified)
IEC 61558-1 NOTE Harmonized as EN 61558-1
IEC 62281 NOTE Harmonized as EN 62281
ISO 13732-1 NOTE Harmonized as EN ISO 13732-1
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SIST EN IEC 60974-1:2018
EN IEC 60974-1:2018 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-151 - International Electrotechnical Vocabulary - - -
Part 151: Electrical and magnetic devices
IEC 60050-851 - 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 - Graphical symbols for use on equipment. HD 243 S12 -
Index, survey and compilation of the single
sheets.
Basic and safety principles for man-
IEC 60445 - - -
machine 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 EN 60664-1 2007
within low-voltage systems - Part 1:
Principles, requirements and tests
IEC 60664-3 - Insulation coordination for equipment EN 60664-3 -
within low-voltage systems - Part 3: Use of
coating, potting or moulding for protection
against pollution
IEC 60695-11-10 - Fire hazard testing -- Part 11-10: Test EN 60695-11-10 -
flames - 50 W horizontal and vertical flame
test methods
IEC 60974-7 - Arc welding equipment -- Part 7:Torches EN 60974-7 -
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SIST EN IEC 60974-1:2018
EN IEC 60974-1:2018 (E)
IEC 61140 - Protection against electric shock - EN 61140 -
Common aspects for installation and
equipment
IEC 61558-2-4 - Safety of transformers, reactors, power EN 61558-2-4 -
supply 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
IEC 61558-2-6 - Safety of transformers, reactors, power EN 61558-2-6 -
supply 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
IEC 62133-1 - Secondary cells and batteries containing EN 62133-1 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary cells, and for batteries made
from them, for use in portable applications
- Part 1: Nickel systems
IEC 62133-2 - Secondary cells and batteries containing EN 62133-2 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary lithium cells, and for batteries
made from them, for use in portable
applications - Part 2: Lithium systems
ISO 7010 2011 Graphical symbols - Safety colours and EN ISO 7010 2012
safety signs - Registered safety signs
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SIST EN IEC 60974-1:2018
IEC 60974-1
Edition 5.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-3854-7

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

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60974-1:2018
– 2 – IEC 60974-1:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 9

1 Scope ............................................................................................................................ 11

2 Normative references .................................................................................................... 11

3 Terms and definitions .................................................................................................... 12

3.1 General terms ....................................................................................................... 12

3.2 Terms related to battery systems .......................................................................... 21

4 Environmental conditions ............................................................................................... 24

5 Tests ............................................................................................................................. 25

5.1 Test conditions ..................................................................................................... 25

5.2 Measuring instruments .......................................................................................... 25

5.3 Conformity of components .................................................................................... 25

5.4 Type tests ............................................................................................................. 26

5.5 Routine tests......................................................................................................... 26

6 Protection against electric shock ................................................................................... 27

6.1 Insulation .............................................................................................................. 27

6.1.1 General ......................................................................................................... 27

6.1.2 Clearances .................................................................................................... 28

6.1.3 Creepage distances ....................................................................................... 30

6.1.4 Insulation resistance ...................................................................................... 32

6.1.5 Dielectric strength .......................................................................................... 32

6.2 Protection against electric shock in normal service (direct contact) ....................... 34

6.2.1 Protection provided by the enclosure ............................................................. 34

6.2.2 Capacitors ..................................................................................................... 34

6.2.3 Automatic discharge of supply circuit capacitors ............................................ 35

6.2.4 Isolation of the welding circuit ........................................................................ 35

6.2.5 Welding circuit touch current ......................................................................... 35

6.2.6 Touch current in normal condition .................................................................. 36

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

............................................................................................................................. 37

6.3.1 Protective provisions ..................................................................................... 37

6.3.2 Isolation between windings of the supply circuit and the welding circuit ......... 37

6.3.3 Internal conductors and connections .............................................................. 37

6.3.4 Additional requirements for plasma cutting systems ....................................... 38

6.3.5 Movable coils and cores ................................................................................ 38

6.3.6 Touch current in fault condition ...................................................................... 38

7 Thermal requirements .................................................................................................... 39

7.1 Heating test .......................................................................................................... 39

7.1.1 Test conditions .............................................................................................. 39

7.1.2 Tolerances of the test parameters ................................................................. 39

7.1.3 Duration of test .............................................................................................. 40

7.2 Temperature measurement ................................................................................... 40

7.2.1 Measurement conditions ................................................................................ 40

7.2.2 Surface temperature sensor ........................................................................... 40

7.2.3 Resistance .................................................................................................... 40

7.2.4 Embedded temperature sensor ...................................................................... 41

7.2.5 Determination of the ambient air temperature ................................................ 41

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SIST EN IEC 60974-1:2018
IEC 60974-1:2017 © IEC 2017 – 3 –

7.2.6 Recording of temperatures ............................................................................ 41

7.3 Limits of temperature rise ..................................................................................... 41

7.3.1 Windings, commutators and slip-rings ............................................................ 41

7.3.2 External surfaces ........................................................................................... 42

7.3.3 Other components ......................................................................................... 43

7.4 Loading test .......................................................................................................... 43

7.5 Commutators and slip-rings .................................................................................. 44

8 Thermal protection......................................................................................................... 44

8.1 General requirements ........................................................................................... 44

8.2 Construction ......................................................................................................... 44

8.3 Location ................................................................................................................ 44

8.4 Operating capacity ................................................................................................ 44

8.5 Operation .............................................................................................................. 45

8.6 Resetting .............................................................................................................. 45

8.7 Indication .............................................................................................................. 45

9 Abnormal operation ....................................................................................................... 45

9.1 General requirements ........................................................................................... 45

9.2 Stalled fan test ...................................................................................................... 46

9.3 Short circuit test .................................................................................................... 46

9.4 Overload test ........................................................................................................ 47

10 Connection to the supply network .................................................................................. 47

10.1 Supply voltage ...................................................................................................... 47

10.2 Multi-supply voltage .............................................................................................. 47

10.3 Means of connection to the supply circuit .............................................................. 47

10.4 Marking of terminals ............................................................................................. 48

10.5 Protective circuit ................................................................................................... 48

10.5.1 Continuity requirement ................................................................................... 48

10.5.2 Type test ....................................................................................................... 49

10.5.3 Routine test ................................................................................................... 49

10.6 Cable anchorage ................................................................................................... 50

10.7 Inlet openings ....................................................................................................... 51

10.8 Supply circuit on/off switching device .................................................................... 51

10.9 Supply cables ....................................................................................................... 52

10.10 Supply coupling device (attachment plug) ............................................................. 52

11 Output ........................................................................................................................... 53

11.1 Rated no-load voltage ........................................................................................... 53

11.1.1 Rated no-load voltage for use in environments with increased risk of

electric shock ................................................................................................ 53

11.1.2 Rated no-load voltage for use in environments without increased risk of

electric shock ................................................................................................ 53

11.1.3 Rated no-load voltage for the use with mechanically held torches with

increased protection for the operator ............................................................. 53

11.1.4 Rated no-load voltage for special processes for example plasma cutting ....... 53

11.1.5 Additional requirements ................................................................................. 54

11.1.6 Measuring circuits ......................................................................................... 55

11.2 Type test values of the conventional load voltage ................................................. 56

11.2.1 Manual metal arc welding with covered electrodes ......................................... 56

11.2.2 Tungsten inert gas ......................................................................................... 56

11.2.3 Metal inert/active gas and flux cored arc welding ........................................... 56

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SIST EN IEC 60974-1:2018
– 4 – IEC 60974-1:2017 © IEC 2017

11.2.4 Submerged arc welding ................................................................................. 56

11.2.5 Plasma cutting ............................................................................................... 56

11.2.6 Plasma welding ............................................................................................. 56

11.2.7 Plasma gouging ............................................................................................. 56

11.2.8 Additional requirements ................................................................................. 56

11.3 Mechanical switching devices used to adjust output .............................................. 57

11.4 Welding circuit connections ................................................................................... 57

11.4.1 Protection against unintentional contact ......................................................... 57

11.4.2 Location of coupling devices .......................................................................... 57

11.4.3 Outlet openings ............................................................................................. 57

11.4.4 Three-phase multi-operator welding transformer ............................................ 57

11.4.5 Marking ......................................................................................................... 58

11.4.6 Connections for plasma cutting torches ......................................................... 58

11.5 Power supply to external devices connected to the welding circuit ........................ 58

11.6 Auxiliary power supply .......................................................................................... 58

11.7 Welding cables ..................................................................................................... 59

12 Control circuits .............................................................................................................. 59

12.1 General requirement ............................................................................................. 59

12.2 Isolation of control circuits .................................................................................... 59

12.3 Working voltages of remote control circuits ........................................................... 59

13 Hazard reducing device ................................................................................................. 60

13.1 General requirements ........................................................................................... 60

13.2 Types of hazard reducing devices ......................................................................... 60

13.2.1 Voltage reducing device ................................................................................ 60

13.2.2 Switching device for AC to DC ....................................................................... 60

13.3 Requirements for hazard reducing devices ............................................................ 60

13.3.1 Disabling the hazard reducing device ............................................................ 60

13.3.2 Interference with operation of a hazard reducing device ................................ 61

13.3.3 Indication of satisfactory operation ................................................................ 61

13.3.4 Fail to a safe condition .................................................................................. 61

14 Mechanical provisions ................................................................................................... 61

14.1 General requirements ........................................................................................... 61

14.2 Enclosure ............................................................................................................. 61

14.2.1 Enclosure materials ....................................................................................... 61

14.2.2 Enclosure strength ......................................................................................... 62

14.3 Handling means .................................................................................................... 62

14.3.1 Mechanised handling ..................................................................................... 62

14.3.2 Manual handling ............................................................................................ 62

14.4 Drop withstand ...................................................................................................... 63

14.5 Tilting stability ....................................................................................................... 63

15 Rating plate ................................................................................................................... 63

15.1 General requirements ........................................................................................... 63

15.2 Description ........................................................................................................... 64

15.3 Contents ............................................................................................................... 65

15.4 Tolerances ............................................................................................................ 68

15.5 Direction of rotation .............................................................................................. 68

16 Adjustment of the output ................................................................................................ 68

16.1 Type of adjustment ............................................................................................... 68

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SIST EN IEC 60974-1:2018
IEC 60974-1:2017 © IEC 2017 – 5 –

16.2 Marking of the adjusting device ............................................................................. 69

16.3 Indication of current or voltage control .................................................................. 69

17 Instructions and markings .............................................................................................. 70

17.1 Instructions ........................................................................................................... 70

17.2 Markings ............................................................................................................... 71

Annex A (informative) Nominal voltages of supply networks ................................................. 72

Annex B (informative) Example of a combined dielectric test ............................................... 73

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

sources ................................................................................................................................. 74

C.1 General ................................................................................................................. 74

C.2 Unbalanced load ................................................................................................... 74

C.3 Example for an unbalanced load ........................................................................... 75

Annex D (informative) Extrapolation of temperature to time of shutdown .............................. 76

Annex E (normative) Construction of supply circuit terminals ............................................... 77

E.1 Size of terminals ................................................................................................... 77

E.2 Connections at the terminals ................................................................................. 77

E.3 Construction of the terminals ................................................................................ 78

E.4 Fixing of the terminals ........................................................................................... 78

Annex F (informative) Cross-reference to non-SI units ......................................................... 79

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

r.m.s. value of the supply current .......................................................................................... 80

Annex H (informative) Plotting of static characteristics ......................................................... 81

H.1 General ................................................................................................................. 81

H.2 Method ................................................................................................................. 81

H.3 Analysis of the results ........................................................................................... 81

Annex I (normative) Test methods for a 10 Nm impact ......................................................... 82

I.1 Pendulum impact hammer ..................................................................................... 82

I.2 Free fall spherical steel we
...

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