EN 60974-2:2013

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: Withdrawn
• Publication Date: 30-May-2013
• Withdrawal Date: 27-Feb-2016
• ICS: 25.160 - Welding, brazing and soldering
• Technical Committee: CLC/TC 26 - Electric welding
• Drafting Committee: IEC/TC 26 - IEC_TC_26
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 06-Mar-2022
• Completion Date: 06-Mar-2022
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Directive: 2014/53/EU - Directive 2014/53/EU of The European Parliament and of the Council of 16 April 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of radio equipment and repealing Directive 1999/5/EC
• Ref Project: SIST EN 60974-2:2013 - Arc welding equipment - Part 2: Liquid cooling systems

Relations

• Replaces: EN 60974-2:2008 - Arc welding equipment - Part 2: Liquid cooling systems
• Effective Date: 28-Jan-2023
• Replaced By: EN IEC 60974-2:2019 - Arc welding equipment - Part 2: Liquid cooling systems
• Effective Date: 04-Apr-2017

Standards Content (Sample)

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

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
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
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 60974-2:2008:
- 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.

- 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
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

– 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

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 .
...