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

Specifies safety requirements for arc striking and arc stabilizing devices used in arc welding and allied processes (typically plasma arc cutting and arc spraying).

Lichtbogenschweißeinrichtungen - Teil 3: Lichtbogenzünd- und -stabilisierungseinrichtungen

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

Spécifie les prescriptions de sécurité pour les dispositifs d'amorçage et de stabilisation utilisés en soudage à l'arc et techniques connexes (typiquement le coupage plasma et la projection à l'arc).

Oprema za obločno varjenje - 3. del: Naprave za vžig in stabilnost obloka (IEC 60974-3:2007)

General Information

Status
Withdrawn
Publication Date
11-Dec-2007
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Due Date
12-Dec-2007
Completion Date
12-Dec-2007

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SLOVENSKI STANDARD
SIST EN 60974-3:2008
01-april-2008
1DGRPHãþD
SIST EN 60974-3:2004
2SUHPD]DREORþQRYDUMHQMHGHO1DSUDYH]DYåLJLQVWDELOQRVWREORND ,(&

Arc welding equipment - Part 3: Arc striking and stabilizing devices
Lichtbogenschweißeinrichtungen - Teil 3: Lichtbogenzünd- und -
stabilisierungseinrichtungen

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

Ta slovenski standard je istoveten z: EN 60974-3:2007
ICS:
25.160.30
SIST EN 60974-3:2008 en,fr,de

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

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 60974-3
NORME EUROPÉENNE
December 2007
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-3:2003
English version
Arc welding equipment -
Part 3: Arc striking and stabilizing devices
(IEC 60974-3:2007)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 3: Dispositifs d'amorçage Teil 3: Lichtbogenzünd- und
et de stabilisation de l'arc -stabilisierungseinrichtungen
(CEI 60974-3:2007) (IEC 60974-3:2007)

This European Standard was approved by CENELEC on 2007-12-01. 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, 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
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-3:2007 E
---------------------- Page: 2 ----------------------
EN 60974-3:2007 – 2 –
Foreword

The text of document 26/363/FDIS, future edition 2 of IEC 60974-3, prepared by IEC TC 26, Electric

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

EN 60974-3 on 2007-12-01.
This European Standard supersedes EN 60974-3:2003.

EN 60974-3:2007 includes the following significant technical changes with respect to EN 60974-3:2003:

– changes induced by the publication of EN 60974-1:2005;
– routine test for built-in unit (see 5.5.2);

– clarification of calculation of the rated peak voltage (see 11.1 and Figure 1).

This standard is to be used in conjunction with EN 60974-1:2005.
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) 2008-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60974-3:2007 was approved by CENELEC as a European

Standard without any modification.
__________
---------------------- Page: 3 ----------------------
– 3 – EN 60974-3:2007
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 60974-1 2005 Arc welding equipment - EN 60974-1 2005
Part 1: Welding power sources
IEC 60974-7 2005 Arc welding equipment - EN 60974-7 2005
Part 7:Torches
---------------------- Page: 4 ----------------------
IEC 60974-3
Edition 2.0 2007-11
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
ICS 25.160 ISBN 2-8318-9389-5
---------------------- Page: 5 ----------------------
– 2 – 60974-3 © IEC:2007
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

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

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

6.2 Protection against electric shock in normal service (direct contact) .........................9

6.3 Protection against electric shock in case of a fault condition (indirect contact) ........9

7 Thermal requirements.......................................................................................................9

8 Abnormal operation ..........................................................................................................9

9 Thermal protection .........................................................................................................10

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

11 Output ............................................................................................................................10

11.1 Rated peak voltage ...............................................................................................10

11.2 Impulse current .....................................................................................................11

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

11.4 Output circuit capacitance discharging ..................................................................14

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

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

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

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

Figure 1 – Rated peak voltage ..............................................................................................10

Figure 2 – Measurement of electric charge of impulse current ..............................................11

Figure 3 – Arc striking and stabilizing voltage .......................................................................12

Figure 4 – Measuring circuit for direct contact.......................................................................12

Figure 5 – Measuring circuit for serial contact.......................................................................14

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

---------------------- Page: 6 ----------------------
60974-3 © IEC:2007 – 3 –

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....................................................................................................................................8

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

---------------------- Page: 7 ----------------------
– 4 – 60974-3 © IEC:2007
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 second edition cancels and replaces the first edition published in 2003 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, edition 3;
– routine test for built-in unit (see 5.5.2);

– clarification of calculation of the rated peak voltage (see 11.1 and Figure 1).

---------------------- Page: 8 ----------------------
60974-3 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/363/FDIS 26/367/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 part of IEC 60974 shall be read in conjunction with IEC 60974-1.

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 maintenance result 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.
---------------------- Page: 9 ----------------------
– 6 – 60974-3 © IEC:2007
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 arc striking and arc stabilizing devices that

are either connected to a separate welding power source or built into the welding power

source 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 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.
IEC 60974-1:2005, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7:2005, Arc welding equipment – Part 7: Torches
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 welding circuit to maintain an arc
3.3
arc striking voltage
voltage superimposed on the no-load voltage to ignite an arc
3.4
arc stabilizing voltage
voltage superimposed on the arc voltage to maintain the arc
3.5
arc striking period

period during which the arc striking voltage is superimposed on the no-load voltage

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