EN 60974-1:2012

SLOVENSKI STANDARD
01-oktober-2012
1DSUDYH]DREORþQRYDUMHQMHGHO9LULYDULOQHJDWRND
Arc welding equipment - Part 1: Welding power sources
Lichtbogenschweißeinrichtungen - Teil 1: Schweißstromquellen
Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage
Ta slovenski standard je istoveten z: EN 60974-1:2012
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 60974-1
NORME EUROPÉENNE
August 2012
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-1:2005

English version
Arc welding equipment -
Part 1: Welding power sources
(IEC 60974-1:2012)
Matériel de soudage à l'arc -  Lichtbogenschweißeinrichtungen -
Partie 1: Sources de courant de soudage Teil 1: Schweißstromquellen
(CEI 60974-1:2012) (IEC 60974-1:2012)

This European Standard was approved by CENELEC on 2012-07-17. 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

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60974-1:2012 E
Foreword
The text of document 26/472/FDIS, future edition 4 of IEC 60974-1, prepared by IEC/TC 26, "Electric
welding" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60974-
1:2012.
The following dates are fixed:
(dop) 2013-04-17
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-07-17
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60974-1:2005.
– the heating test shall be carried out at ambient temperature of 40 °C (see 5.1);
– new Figure 1 summarizes example of insulation requirements;
– creepage distances for pollution degree 4 are no longer valid (see Table 2);
– insulation requirements for Class II equipment are defined (see Table 3);
– dielectric test voltage interpolation restriction lower limit is changed to 220 V and interpolation for control
and welding circuit is clarified (see Table 4);
– water test is clarified by suppression of visual inspection (see 6.2.1);
– isolation requirements of the supply circuit and the welding circuit are moved in protection against
electric shock in normal service (see 6.2.4);
– touch current in normal service and in single fault condition requirements are changed (see 6.2.5, 6.2.6
and 6.3.6);
– maximum temperature for insulation systems are reviewed in accordance with current edition of
EN 60085 (see Table 6);
– limits of temperature rise for external surfaces are updated depending of unintentional contact period as
defined in EN ISO 13732-1 (see Table 7);
– loading test is completed by a dielectric test (see 7.4);
– conformity test for tolerance to supply voltage fluctuation is clarified (see 10.1);
– marking of terminals is limited to external protective conductor and three-phase equipment terminals
(see 10.4);
– usage of hazard reducing device is clarified (see 11.1);
– requirements for control circuits are changed (see Clause 12);
– impact test is clarified (see 14.2.2);
– environmental parameters are completed (see Annex M).
In this standard, the following print types are used:

- 3 - EN 60974-1:2012
– 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 60974-1:2012 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60038:2009 NOTE  Harmonized as EN 60038:2011 (modified).
IEC 60085 NOTE  Harmonized as EN 60085.
IEC 60204-1 NOTE  Harmonized as EN 60204-1.
IEC 60309-1 NOTE  Harmonized as EN 60309-1.
IEC 60950-1 NOTE  Harmonized as EN 60950-1.
IEC 60974-6 NOTE  Harmonized as EN 60974-6.
IEC 60974-10 NOTE  Harmonized as EN 60974-10.
IEC 60974-12 NOTE  Harmonized as EN 60974-12.
IEC 61558-1 NOTE  Harmonized as EN 61558-1.
IEC 62079 NOTE  Harmonized as EN 62079.
ISO 13732-1 NOTE  Harmonized as EN ISO 13732-1

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 60050-151 2001 International Electrotechnical Vocabulary - -
(IEV) -
Part 151: Electrical and magnetic devices

IEC 60050-851 2008 International Electrotechnical Vocabulary - - -
Part 851: Electric welding
IEC 60245-6 - Rubber insulated cables - Rated voltages up - -
to and including 450/750 V -
Part 6: Arc welding electrode cables

IEC 60417 Data- Graphical symbols for use on equipment - -
base
IEC 60445 - Basic and safety principles for man-machine EN 60445 -
interface, marking and identification -
Identification of equipment terminals,
conductor terminations and conductors

IEC 60529 - Degrees of protection provided by enclosures - -
(IP Code)
IEC 60664-1 2007 Insulation coordination for equipment within EN 60664-1 2007
low-voltage systems -
Part 1: Principles, requirements and tests

IEC 60664-3 - Insulation coordination for equipment within EN 60664-3 -
low-voltage systems -
Part 3: Use of coating, potting or moulding for
protection against pollution
IEC 60695-11-10 - Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W horizontal and
vertical flame test methods
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

IEC 61558-2-4 - Safety of transformers, reactors, power supply EN 61558-2-4 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-4: Particular requirements and tests for
isolating transformers and power supply units
incorporating isolating transformers

- 5 - EN 60974-1:2012
Publication Year Title EN/HD Year
IEC 61558-2-6 - Safety of transformers, reactors, power supply EN 61558-2-6 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-6: Particular requirements and tests for
safety isolating transformers and power
supply units incorporating safety isolating
transformers
IEC 60974-1 ®
Edition 4.0 2012-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 1: Welding power sources
Matériel de soudage à l’arc –
Partie 1: Sources de courant de soudage

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XE
ICS 25.160 ISBN 978-2-83220-095-7

– 2 – 60974-1 © IEC:2012
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references. 9
3 Terms and definitions . 10
4 Environmental conditions . 18
5 Tests . 19
5.1 Test conditions . 19
5.2 Measuring instruments . 19
5.3 Conformity of components . 19
5.4 Type tests . 20
5.5 Routine tests . 20
6 Protection against electric shock . 21
6.1 Insulation . 21
6.1.1 General . 21
6.1.2 Clearances . 22
6.1.3 Creepage distances . 23
6.1.4 Insulation resistance . 25
6.1.5 Dielectric strength . 25
6.2 Protection against electric shock in normal service (direct contact) . 26
6.2.1 Protection provided by the enclosure . 26
6.2.2 Capacitors . 27
6.2.3 Automatic discharge of supply circuit capacitors . 27
6.2.4 Isolation of the welding circuit . 28
6.2.5 Welding circuit touch current . 28
6.2.6 Touch current in normal condition . 29
6.3 Protection against electric shock in case of a fault condition (indirect contact) . 29
6.3.1 Protective provisions . 29
6.3.2 Isolation between windings of the supply circuit and the welding circuit . 29
6.3.3 Internal conductors and connections . 29
6.3.4 Additional requirements for plasma cutting systems . 30
6.3.5 Movable coils and cores . 30
6.3.6 Touch current in fault condition . 31
7 Thermal requirements . 31
7.1 Heating test . 31
7.1.1 Test conditions . 31
7.1.2 Tolerances of the test parameters . 32
7.1.3 Duration of test . 32
7.2 Temperature measurement . 32
7.2.1 Measurement conditions . 32
7.2.2 Surface temperature sensor . 32
7.2.
...