Arc welding equipment - Part 3: Arc striking and stabilizing devices

IEC 60974-3:2013 specifies safety requirements for industrial and professional arc striking and arc stabilizing devices used in arc welding and allied processes. This part of IEC 60974 is applicable to stand-alone units which may be connected to a separate welding power source or one where the welding power source and the arc striking and arc stabilizing device are housed in a single enclosure. This third edition cancels and replaces the second edition published in 2007 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - changes induced by the publication of IEC 60974-1:2012.

Lichtbogenschweißeinrichtungen - Teil 3: Lichtbogenzünd- und -stabilisierungseinrichtungen

Matériel de soudage à l'arc - Partie 3: Dispositifs d'amorçage et de stabilisation de l'arc

L'IEC 60974-3:2013 spécifie les exigences de sécurité pour les dispositifs d'amorçage et de stabilisation industriels et professionnels utilisés en soudage à l'arc et techniques connexes. La présente partie de la CEI 60974 s'applique aux unités indépendantes qui peuvent être soit raccordées à la source de courant de soudage, soit dotées d'une source de courant de soudage et de dispositifs d'amorçage et de stabilisation de l'arc intégrés dans la même enveloppe. Cette troisième édition annule et remplace la deuxième édition parue en 2007 et constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - modifications induites par la publication de la CEI 60974-1:2012.

Oprema za obločno varjenje - 3. del: Obločni udari in stabilizatorji (IEC 60974-3:2013)

General Information

Status
Published
Publication Date
13-Feb-2014
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
14-Feb-2014
Completion Date
14-Feb-2014

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SLOVENSKI STANDARD
SIST EN 60974-3:2014
01-april-2014
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SIST EN 60974-3:2008
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Arc welding equipment - Part 3: Arc striking and stabilizing devices

Matériel de soudage à l'arc - Partie 3: Dispositifs d'amorçage et de stabilisation de l'arc

Ta slovenski standard je istoveten z: EN 60974-3:2014
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-3:2014 en

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

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SIST EN 60974-3:2014
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SIST EN 60974-3:2014
EUROPEAN STANDARD
EN 60974-3
NORME EUROPÉENNE
February 2014
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-3:2007
English version
Arc welding equipment -
Part 3: Arc striking and stabilizing devices
(IEC 60974-3:2013)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 3: Dispositifs d'amorçage et de Teil 3: Lichtbogenzünd- und -
stabilisation de l'arc stabilisierungseinrichtungen
(CEI 60974-3:2013) (IEC 60974-3:2013)

This European Standard was approved by CENELEC on 2013-12-31. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the CEN-CENELEC Management Centre has the same status as the official versions.

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

the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-3:2014 E
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SIST EN 60974-3:2014
EN 60974-3:2014 - 2 -
Foreword

The text of document 26/518/FDIS, future edition 3 of IEC 60974-3, prepared by IEC/TC 26 "Electric

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

EN 60974-3:2014.
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2014-09-30
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2016-12-31
the document have to be withdrawn
This document supersedes EN 60974-3:2007.

EN 60974-3:2014 includes the following significant technical changes with respect to

EN 60974-3:2007:
– changes induced by the publication of IEC 60974-1:2012.
This standard is to be read in conjunction with 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 [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment

Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice

The text of the International Standard IEC 60974-3:2013 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated :

IEC 60974 NOTE Harmonized in EN 60974 series (not modified).
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SIST EN 60974-3:2014
- 3 - EN 60974-3:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

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

NOTE When an international publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60974-1 2012 Arc welding equipment EN 60974-1 2012
Part 1: Welding power sources
IEC 60974-7 - Arc welding equipment EN 60974-7 -
Part 7:Torches
IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment
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SIST EN 60974-3:2014
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SIST EN 60974-3:2014
IEC 60974-3
Edition 3.0 2013-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 3: Arc striking and stabilizing devices
Matériel de soudage à l’arc –
Partie 3: Dispositifs d’amorçage et de stabilisation de l’arc
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 25.160 ISBN 978-2-8322-1199-1

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60974-3:2014
– 2 – 60974-3  IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Environmental conditions ................................................................................................. 7

5 Tests ............................................................................................................................... 7

5.1 Test conditions .................................................................................................. 7

5.2 Measuring instruments ....................................................................................... 7

5.3 Conformity of components ................................................................................. 7

5.4 Type tests .......................................................................................................... 7

5.5 Routine tests...................................................................................................... 7

5.5.1 Stand-alone unit ............................................................................... 7

5.5.2 Built-in unit ....................................................................................... 8

6 Protection against electric shock ..................................................................................... 8

6.1 Insulation ........................................................................................................... 8

6.1.1 General ............................................................................................ 8

6.1.2 Clearances ....................................................................................... 8

6.1.3 Creepage distances .......................................................................... 8

6.1.4 Insulation resistance ......................................................................... 9

6.1.5 Dielectric strength ............................................................................. 9

6.2 Protection against electric shock in normal service (direct contact) .................. 10

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

contact) ........................................................................................................... 10

6.4 Protective provision ......................................................................................... 10

7 Thermal requirements .................................................................................................... 10

8 Thermal protection ........................................................................................................ 10

9 Abnormal operation ....................................................................................................... 10

10 Connection to the supply network .................................................................................. 11

11 Output ........................................................................................................................... 11

11.1 Rated peak voltage .......................................................................................... 11

11.2 Impulse current ................................................................................................ 12

11.2.1 Risk of electric shock ...................................................................... 12

11.2.2 Electric charge................................................................................ 12

11.2.3 Direct contact ................................................................................. 12

11.2.4 Series contact................................................................................. 13

11.3 Mean energy .................................................................................................... 14

11.4 Output circuit capacitance discharging ............................................................. 15

12 Control circuits .............................................................................................................. 15

13 Hazard reducing device ................................................................................................. 15

14 Mechanical provisions ................................................................................................... 15

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

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

17 Instructions and markings .............................................................................................. 16

17.1 Instructions ...................................................................................................... 16

17.2 Markings .......................................................................................................... 17

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SIST EN 60974-3:2014
60974-3  IEC:2013 – 3 –

Annex A (informative) Examples of coupling systems for arc striking and stabilizing

devices ................................................................................................................................. 18

Annex B (informative) Example of a rating plate ................................................................... 19

Bibliography .......................................................................................................................... 20

Figure 1 – Rated peak voltage .............................................................................................. 11

Figure 2 – Measurement of electric charge of impulse current .............................................. 12

Figure 3 – Measuring circuit for direct contact ....................................................................... 13

Figure 4 – Measuring circuit for serial contact ....................................................................... 14

Figure 5 – Measurement of mean energy .............................................................................. 14

Figure 6 – Measuring circuit for capacitance discharging ...................................................... 15

Figure A.1 – Examples of coupling systems for arc striking and stabilizing devices .............. 18

Figure B.1 – Stand-alone unit ............................................................................................... 19

Table 1 – Minimum clearances and creepage distances for arc striking and stabilizing

circuits .................................................................................................................................... 9

Table 2 – Maximum peak voltages ........................................................................................ 11

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SIST EN 60974-3:2014
– 4 – 60974-3  IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 3: Arc striking and stabilizing devices
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 60974-3 has been prepared by IEC technical committee 26:

Electric welding.

This third edition cancels and replaces the second edition published in 2007 and constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– changes induced by the publication of IEC 60974-1:2012.
---------------------- Page: 10 ----------------------
SIST EN 60974-3:2014
60974-3  IEC:2013 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/518/FDIS 26/521/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This standard shall be read in conjunction with IEC 60974-1:2012.

The list of all the parts of IEC 60974, under the general title Arc welding equipment, can be

found on the IEC web site.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60974-3:2014
– 6 – 60974-3  IEC:2013
ARC WELDING EQUIPMENT –
Part 3: Arc striking and stabilizing devices
1 Scope

This part of IEC 60974 specifies safety requirements for industrial and professional arc

striking and arc stabilizing devices used in arc welding and allied processes.

This part of IEC 60974 is applicable to stand-alone units which may be connected to a

separate welding power source or one where the welding power source and the arc striking

and arc stabilizing device are housed in a single enclosure.

NOTE 1 Typical allied processes are for example plasma arc cutting and arc spraying.

NOTE 2 This standard does not include electromagnetic compatibility (EMC) requirements.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60974-1:2012, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7, Arc welding equipment – Part 7: Torches

IEC 61140, Protection against electric shock – Common aspects for installation and

equipment
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60974-1 and

IEC 60974-7, as well as the following, apply.
3.1
arc striking device
device which superimposes a voltage on the welding circuit to ignite an arc
3.2
arc stabilizing device
device which superimposes a voltage on the wel
...

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