Arc welding equipment - Part 2: Liquid cooling systems

This part of IEC 60974 specifies safety and construction requirements for industrial and professional LIQUID COOLING SYSTEMS used in arc welding and allied processes to cool torches. This document is applicable to LIQUID COOLING SYSTEMS which are stand-alone (separate from the welding equipment) or built-in (housed in a single enclosure with other welding equipment). This document is not applicable to refrigerated cooling systems. NOTE 1 Typical allied processes are electric arc cutting and arc spraying. NOTE 2 This part of IEC 60974 does not include electromagnetic compatibility (EMC) requirements that are given in IEC 60974-10.

Lichtbogenschweißeinrichtungen - Teil 2: Flüssigkeitskühlsysteme

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

La présente partie de l'IEC 60974 spécifie les exigences de sécurité et de construction des SYSTEMES DE REFROIDISSEMENT PAR LIQUIDE industriels et professionnels utilisés en soudage à l'arc et les procédés connexes pour refroidir des torches. Le présent document s'applique aux SYSTEMES DE REFROIDISSEMENT PAR LIQUIDE qui sont indépendants (séparés du matériel de soudage) ou incorporés (intégrés dans une seule enveloppe avec d’autres matériels de soudage). Le présent document ne s'applique pas aux systèmes de refroidissement avec réfrigération. NOTE 1 Le coupage à l’arc électrique et la projection à l'arc électrique sont des exemples de procédés connexes typiques. NOTE 2 La présente partie de l’IEC 60974 ne contient pas les exigences de compatibilité électromagnétique (CEM) qui sont données dans l’IEC 60974-10.

Oprema za obločno varjenje - 2. del: Hladilni sistemi s tekočino (IEC 60974-2:2019)

Ta dokument določa varnostne in konstrukcijske zahteve za industrijske ter profesionalne HLADILNE SISTEME S TEKOČINO, ki se uporabljajo pri obločnem varjenju in podobnih postopkih za hlajenje plamena. Ta dokument se uporablja za samostojne HLADILNE SISTEME S TEKOČINO (ločene od opreme za varjenje) ali za vgrajene (v skupnem ohišju z drugo opremo za varjenje). Ta dokument se ne uporablja za ohlajevane hladilne sisteme.

General Information

Status
Published
Publication Date
25-Apr-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
26-Apr-2019
Completion Date
26-Apr-2019

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SLOVENSKI STANDARD
SIST EN IEC 60974-2:2020
01-februar-2020
Nadomešča:
SIST EN 60974-2:2013

Oprema za obločno varjenje - 2. del: Hladilni sistemi s tekočino (IEC 60974-2:2019)

Arc welding equipment - Part 2: Liquid cooling systems (IEC 60974-2:2019)

Lichtbogenschweißeinrichtungen - Teil 2: Flüssigkeitskühlsysteme (IEC 60974-2:2019)

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

60974-2:2019)
Ta slovenski standard je istoveten z: EN IEC 60974-2:2019
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN IEC 60974-2:2020 en

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

---------------------- Page: 1 ----------------------
SIST EN IEC 60974-2:2020
---------------------- Page: 2 ----------------------
SIST EN IEC 60974-2:2020
EUROPEAN STANDARD EN IEC 60974-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 25.160.30 Supersedes EN 60974-2:2013
English Version
Arc welding equipment - Part 2: Liquid cooling systems
(IEC 60974-2:2019)

Matériel de soudage à l'arc - Partie 2: Systèmes de Lichtbogenschweißeinrichtungen - Teil 2:

refroidissement par liquide Flüssigkeitskühlsysteme
(IEC 60974-2:2019) (IEC 60974-2:2019)

This European Standard was approved by CENELEC on 2019-03-06. 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

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60974-2:2019 E
---------------------- Page: 3 ----------------------
SIST EN IEC 60974-2:2020
EN IEC 60974-2:2019 (E)
European foreword

The text of document 26/670/FDIS, future edition 4 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 IEC 60974-2:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2019-12-06

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-03-06

document have to be withdrawn
This document supersedes EN 60974-2:2013.

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 60974-2:2019 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 60974-2:2020
EN IEC 60974-2:2019 (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 60974-1 2017 Arc welding equipment - Part 1: Welding power EN IEC 60974-1 2018

sources
IEC 60974-7 2013 Arc welding equipment - Part 7: Torches EN 60974-7 2013

IEC 60974-10 2014 Arc welding equipment - Part 10: Electromagnetic EN 60974-10 2014

compatibility (EMC) requirements
---------------------- Page: 5 ----------------------
SIST EN IEC 60974-2:2020
EN IEC 60974-2:2019 (E)
Annex ZZ
(informative)
Relationship between this European standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered

This European Standard has been prepared under a Commission’s standardization request relating to

harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means

of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the

Council of 26 February 2014 on the harmonization 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

[2014 OJ L96].

Once this standard is cited in the Official Journal of the European Union under that Directive,

compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of

the scope of this standard, a presumption of conformity with the corresponding safety objectives of

that Directive, and associated EFTA regulations.

Table ZZ.1 – Correspondence between this European standard and Annex I of Directive

2014/35/EU [2014 OJ L96]
Clause(s) / sub-clause(s)
Safety objectives of Directive
Remarks / Notes
2014/35/EU
of this EN
1(a) Clauses 11, 12.1, 12.2
1(b) Clauses 12.1, 17.1
Testing during periodic
Clauses 1, 3, 4
1(c) maintenance or after repair is
see also points 2 and 3 below
covered in separate standards
Clauses 6.1, 6.2, 6.3, 6.4, 6.5, 7.2,
2(a)
7.3, 12.1 d) and e), 12.2.2, 12.2.3
Hazards arising from electric,
magnetic, and electromagnetic
Clauses 5.3, 6.1, 6.2, 6.3, 7.2, 7.3,
2(b) fields, other ionizing and non-
8.2
ionizing radiation are covered in
separate standards
Clauses 5.4 c), 6.2, 6.4.5, 7.1, 8.3,
2(c)
9.1, 12.1 m)
2(d) Clause 6.1
3(a) Clause 7.1
Functional safety is covered in
separate standards
3(b) Clauses 4, 6.2, 6.4.9, 7.1, 12.1 n)
Safety-related security is
covered in separate standards
3(c) Clause 9

WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European

standard is maintained in the list published in the Official Journal of the European Union. Users of this

standard should consult frequently the latest list published in the Official Journal of the European

Union.

WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of

this standard.
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SIST EN IEC 60974-2:2020
IEC 60974-2
Edition 4.0 2019-01
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
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-6497-3

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
---------------------- Page: 7 ----------------------
SIST EN IEC 60974-2:2020
– 2 – IEC 60974-2:2019 © IEC 2019
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 ......................................................................................... 9

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 IEC 60974-2:2020
IEC 60974-2:2019 © IEC 2019 – 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............................................................................................................ 12

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 ............................................................................................................... 16

12.2.1 General ......................................................................................................... 16

12.2.2 Inlet and outlet ............................................................................................... 16

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

Figure B.1 – Single-phase stand-alone cooling unit ............................................................... 18

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

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SIST EN IEC 60974-2:2020
– 4 – IEC 60974-2:2019 © IEC 2019
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 fourth edition cancels and replaces the third edition published in 2013 and constitutes a

technical revision.

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

edition:
a) changes induced by the publication of IEC 60974-1:2017;
b) reference in 11.1 changed.
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SIST EN IEC 60974-2:2020
IEC 60974-2:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
26/670/FDIS 26/675/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document 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.

– terms used throughout this standard which have been defined in clause 3: SMALL ROMAN

CAPITALS.
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