Arc welding equipment - Part 2: Liquid cooling systems

IEC 60974-2:2013 specifies safety and construction requirements for industrial and professional liquid cooling systems used in arc welding and allied processes to cool torches. This part of IEC 60974 is applicable to stand-alone liquid cooling systems that are either connected to a separate welding power source or built into the welding power source enclosure. This part of IEC 60974 is not applicable to refrigerated cooling systems. This third edition cancels and replaces the first 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; - addition of a liquid temperature fixed to 65 °C during the heating test in order to allow testing at different ambient air temperature (see 10 d)); - correction factor of cooling power at 40 °C required in instruction manual (see 12.1 o)).

Lichtbogenschweißeinrichtungen - Teil 2: Flüssigkeitskühlsysteme

Matériel de soudage à l'arc - Partie 2: Systèmes de refroidissement par liquide

La CEI 60974-2:2013 spécifie les exigences de sécurité et de construction des systèmes de refroidissement par liquide industriels et professionnels utilisés en soudage à l'arc et techniques connexes pour refroidir des torches. La présente partie de la CEI 60974 s'applique aux systèmes de refroidissement par liquide indépendants qui sont soit raccordés à une source de courant de soudage séparée soit incorporés dans l'enveloppe de la source de courant de soudage. La présente partie de la CEI 60974 ne s'applique pas aux systèmes de refroidissement avec réfrigération. Cette troisième édition annule et remplace la seconde édition parue en 2007 et constitue une révision technique. Les modifications techniques majeures par rapport à l'édition précédente sont les suivantes: - modifications induites par la publication de la CEI 60974-1:2012; - addition d'une température du liquide fixée à 65 °C pendant l'essai d'échauffement afin de permettre les essais à différentes températures ambiantes (voir 10 d)); - facteur de correction de la puissance de refroidissement à 40 °C requis dans le manuel d'instructions (voir 12.1 o)).

Oprema za obločno varjenje - 2. del: Hladilni sistemi s tekočino

Ta del standarda IEC 60974 določa varnostne in konstrukcijske zahteve za industrijske in strokovne hladilne sisteme s tekočino, ki se uporabljajo pri obločnem varjenju in podobnih postopkih za hlajenje plamena. Ta del standarda IEC 60974 se uporablja za samostojne hladilne sisteme s tekočino, ki so povezani z ločenim virom varilnega toka ali vgrajeni v ohišju vira varilnega toka. Ta del standarda IEC 60974 se ne uporablja za ohlajevane hladilne sisteme.

General Information

Status
Published
Publication Date
30-May-2013
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Completion Date
31-May-2013

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SLOVENSKI STANDARD
SIST EN 60974-2:2013
01-september-2013
1DGRPHãþD
SIST EN 60974-2:2008
2SUHPD]DREORþQRYDUMHQMHGHO+ODGLOQLVLVWHPLVWHNRþLQR
Arc welding equipment - Part 2: Liquid cooling systems
Lichtbogenschweißeinrichtungen - Teil 2: Flüssigkeitskühlsysteme
Matériel de soudage à l'arc - Partie 2: Systèmes de refroidissement par liquide
Ta slovenski standard je istoveten z: EN 60974-2:2013
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-2:2013 en

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

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SIST EN 60974-2:2013
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SIST EN 60974-2:2013
EUROPEAN STANDARD
EN 60974-2
NORME EUROPÉENNE
May 2013
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-2:2008
English version
Arc welding equipment -
Part 2: Liquid cooling systems
(IEC 60974-2:2013)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 2: Systèmes de refroidissement Teil 2: Flüssigkeitskühlsysteme
par liquide (IEC 60974-2:2013)
(CEI 60974-2:2013)

This European Standard was approved by CENELEC on 2013-02-28. 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
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-2:2013 E
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SIST EN 60974-2:2013
EN 60974-2:2013 - 2 -
Foreword

The text of document 26/494/FDIS, future edition 3 of IEC 60974-2, prepared by IEC/TC 26 "Electric

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

EN 60974-2:2013.
The following dates are fixed:
(dop) 2013-11-30
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-02-28
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60974-2:2008.

EN 60974-2:2013 includes the following significant technical changes with respect to

EN 60974-2:2008:
- changes induced by the publication of EN 60974-1:2012;

- addition of a liquid temperature fixed to 65 °C during the heating test in order to allow testing at

different ambient air temperature (see 10 d));

- correction factor of cooling power at 40 °C required in instruction manual (see 12.1 o)).

This standard shall be used in conjunction with EN 60974-1:2012.
In this standard, the following print types are used:
- conformity statements: in italic type.

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 60974-2:2013 was approved by CENELEC as a European

Standard without any modification.
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SIST EN 60974-2:2013
- 3 - EN 60974-2:2013
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 60974-10 - Arc welding equipment - EN 60974-10 -
Part 10: Electromagnetic compatibility
(EMC) requirements
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SIST EN 60974-2:2013
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SIST EN 60974-2:2013
IEC 60974-2
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 2: Liquid cooling systems
Matériel de soudage à l’arc –
Partie 2: Systèmes de refroidissement par liquide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 25.160 ISBN 978-2-83220-572-3

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 60974-2:2013
– 2 – 60974-2 © 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

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

6.1.5 Dielectric strength ....................................................................................... 8

6.2 Protection against electric shock in normal service (direct contact) ......................... 8

6.3 Protection against electric shock in case of a fault condition (indirect contact) ........ 8

6.3.1 Protective provisions ................................................................................... 8

6.3.2 Isolation between windings of the supply circuit and the welding

circuit .......................................................................................................... 8

6.3.3 Internal conductors and connections ............................................................ 8

6.3.4 Touch current in fault condition .................................................................... 8

6.4 Connection to the supply network ............................................................................ 8

6.4.1 Supply voltage ............................................................................................. 8

6.4.2 Multi-supply voltage ..................................................................................... 8

6.4.3 Means of connection to the supply circuit .................................................... 9

6.4.4 Marking of terminals .................................................................................... 9

6.4.5 Protective circuit .......................................................................................... 9

6.4.6 Cable anchorage ......................................................................................... 9

6.4.7 Inlet openings .............................................................................................. 9

6.4.8 Supply circuit on/off switching device .......................................................... 9

6.4.9 Supply cables .............................................................................................. 9

6.4.10 Supply coupling device (attachment plug) .................................................... 9

6.5 Leakage current between welding circuit and protective earth ................................. 9

7 Mechanical provisions .................................................................................................... 10

7.1 General ................................................................................................................. 10

7.2 Cooling liquid overflow .......................................................................................... 10

7.3 Hose coupling devices and hose connections ........................................................ 10

8 Cooling system ............................................................................................................... 10

8.1 Rated maximum pressure ...................................................................................... 10

8.2 Thermal requirements ........................................................................................... 11

8.2.1 Heating test ............................................................................................... 11

8.2.2 Tolerances of test parameters ................................................................... 11

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SIST EN 60974-2:2013
60974-2 © IEC:2013 – 3 –

8.2.3 Duration of test .......................................................................................... 11

8.3 Pressure and temperature ..................................................................................... 11

9 Abnormal operation ........................................................................................................ 11

9.1 General requirements ............................................................................................ 11

9.2 Stalled test ............................................................................................................ 11

10 Cooling power ................................................................................................................ 12

11 Rating plate .................................................................................................................... 13

11.1 General ................................................................................................................. 13

11.2 Description ............................................................................................................ 13

11.3 Contents................................................................................................................ 14

11.4 Tolerances ............................................................................................................ 15

12 Instructions and markings ............................................................................................... 15

12.1 Instructions ........................................................................................................... 15

12.2 Markings ............................................................................................................... 15

12.2.1 General ..................................................................................................... 15

12.2.2 Inlet and outlet .......................................................................................... 15

12.2.3 Pressure warning ....................................................................................... 16

Annex A (informative) Example diagram of built-in and stand-alone liquid cooling

systems ................................................................................................................................ 17

Annex B (informative) Example for a rating plate of stand-alone cooling system ................... 18

Figure 1 – Leakage current measurement configuration ........................................................ 10

Figure 2 – Measuring circuit for determination of the cooling power ...................................... 13

Figure 3 – Principle of the rating plate of stand-alone cooling systems .................................. 14

Figure A.1 – Example diagram of built-in liquid cooling systems............................................ 17

Figure A.2 – Example diagram of stand-alone liquid cooling systems .................................... 17

Table 1 – Example of cooling liquid data at 60 °C ................................................................. 13

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SIST EN 60974-2:2013
– 4 – 60974-2 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 2: Liquid cooling systems
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 60974-2 has been prepared by IEC technical committee 26:

Electric welding.

This third edition cancels and replaces the first 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;

• addition of a liquid temperature fixed to 65 °C during the heating test in order to allow

testing at different ambient air temperature (see 10 d));

• correction factor of cooling power at 40 °C required in instruction manual (see 12.1 o)).

---------------------- Page: 10 ----------------------
SIST EN 60974-2:2013
60974-2 © IEC:2013 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/494/FDIS 26/496/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.

In this standard, the following print types are used:
– conformity statements: in italic type.
This standard shall be used in conjunction with IEC 60974-1:2012.

The list of all 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 60974-2:2013
– 6 – 60974-2 © IEC:2013
ARC WELDING EQUIPMENT –
Part 2: Liquid coo
...

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