1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationArc welding equipmentPart 1: Welding power sourcesBS EN 60974-1:2012National forewordThis British Standard is the UK implementation of EN 60974-1:2012. It is identical to IEC 609
2、74-1:2012. It supersedes BS EN 60974-1:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/6, Electric arc welding equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does no
3、t purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 65872 3 ICS 25.160.30Compliance with a British Standard cannot confer immunity from legal o
4、bligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 60974-1:2012EUROPEAN STANDARD EN 60974-1 NORME EUROPENNE EUROPISCHE NORM August 2012 CENELEC
5、European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr 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 fo
6、r CENELEC members. Ref. No. EN 60974-1:2012 E ICS 25.160 Supersedes EN 60974-1:2005English version Arc welding equipment - Part 1: Welding power sources (IEC 60974-1:2012) Matriel de soudage larc - Partie 1: Sources de courant de soudage (CEI 60974-1:2012) Lichtbogenschweieinrichtungen - Teil 1: Sch
7、weistromquellen (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
8、-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 t
9、ranslation 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 Republi
10、c, 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. BS
11、EN 60974-1:2012EN 60974-1:2012 - 2 - 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: latest date by which th
12、e document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-04-17 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-07-17 This document supersedes EN 60974-1:2005. EN 60974-1:
13、2012 includes the following significant technical changes with respect to 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 Ta
14、ble 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 inspectio
15、n (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 f
16、or 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)
17、; 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 chang
18、ed (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: BS EN 60974-1:2012- 3 - EN 60974-1:2012 conformity statements: in italic type. Attention is drawn to the possibility that some of the
19、 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
20、 (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 Har
21、monized 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 609
22、74-12 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 BS EN 60974-1:2012EN 60974-1:2012 - 4 - Annex ZA (normative) Normative references to international publications with their correspondi
23、ng 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 ame
24、ndments) 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
25、 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-base Graphical symbols for use on equipment - - IEC 60445 - Basic
26、and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors EN 60445 - IEC 60529 - Degrees of protection provided by enclosures (IP Code) - - IEC 60664-1 2007 Insulation coordination for equipment within l
27、ow-voltage systems - Part 1: Principles, requirements and tests EN 60664-1 2007 IEC 60664-3 - Insulation coordination for equipment within low-voltage systems - Part 3: Use of coating, potting or moulding for protection against pollution EN 60664-3 - IEC 60695-11-10 - Fire hazard testing - Part 11-1
28、0: Test flames - 50 W horizontal and vertical flame test methods EN 60695-11-10 - IEC 60974-7 - Arc welding equipment - Part 7:Torches EN 60974-7 - IEC 61140 - Protection against electric shock - Common aspects for installation and equipment EN 61140 - IEC 61558-2-4 - Safety of transformers, reactor
29、s, power supply 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 EN 61558-2-4 - BS EN 60974-1:2012- 5 - EN 60974-1:2012 Publication Year Title EN/HD Year I
30、EC 61558-2-6 - Safety of transformers, reactors, power supply 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 EN 61558-2-6 - BS EN 60974-1:2
31、012 2 60974-1 IEC:2012 CONTENTS 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
32、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
33、 . 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 prov
34、isions 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
35、 . 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 7.2.3 Resistance . 33 7.2.4 Embedded temperature sensor 33 7.2.5 Determinatio
36、n of the ambient air temperature . 33 7.2.6 Recording of temperatures . 33 7.3 Limits of temperature rise 34 BS EN 60974-1:201260974-1 IEC:2012 3 7.3.1 Windings, commutators and slip-rings 34 7.3.2 External surfaces . 34 7.3.3 Other components . 35 7.4 Loading test . 35 7.5 Commutators and slip-ring
37、s . 36 8 Thermal protection 36 8.1 General requirements 36 8.2 Construction 36 8.3 Location 36 8.4 Operating capacity . 36 8.5 Operation 37 8.6 Resetting . 37 8.7 Indication . 37 9 Abnormal operation. 37 9.1 General requirements 37 9.2 Stalled fan test 38 9.3 Short circuit test 38 9.4 Overload test
38、. 38 10 Connection to the supply network 39 10.1 Supply voltage . 39 10.2 Multi-supply voltage . 39 10.3 Means of connection to the supply circuit . 39 10.4 Marking of terminals 40 10.5 Protective circuit 40 10.5.1 Continuity requirement . 40 10.5.2 Type test . 41 10.5.3 Routine test . 41 10.6 Cable
39、 anchorage . 42 10.7 Inlet openings 43 10.8 Supply circuit on/off switching device . 43 10.9 Supply cables 44 10.10 Supply coupling device (attachment plug). 44 11 Output 45 11.1 Rated no-load voltage 45 11.1.1 Rated no-load voltage for use in environments with increased risk of electric shock 45 11
40、.1.2 Rated no-load voltage for use in environments without increased risk of electric shock . 45 11.1.3 Rated no-load voltage for the use with mechanically held torches with increased protection for the operator 45 11.1.4 Rated no-load voltage for special processes for example plasma cutting . 45 11
41、.1.5 Additional requirements . 46 11.1.6 Measuring circuits 47 11.2 Type test values of the conventional load voltage . 48 11.2.1 Manual metal arc welding with covered electrodes 48 11.2.2 Tungsten inert gas . 48 11.2.3 Metal inert/active gas and flux cored arc welding 48 11.2.4 Submerged arc weldin
42、g 48 BS EN 60974-1:2012 4 60974-1 IEC:2012 11.2.5 Plasma cutting . 48 11.2.6 Plasma welding 48 11.2.7 Plasma gouging . 48 11.2.8 Additional requirements . 48 11.3 Mechanical switching devices used to adjust output . 48 11.4 Welding circuit connections . 49 11.4.1 Protection against unintentional con
43、tact . 49 11.4.2 Location of coupling devices 49 11.4.3 Outlet openings . 49 11.4.4 Three-phase multi-operator welding transformer 49 11.4.5 Marking . 49 11.4.6 Connections for plasma cutting torches 50 11.5 Power supply to external devices connected to the welding circuit 50 11.6 Auxiliary power su
44、pply . 50 11.7 Welding cables 51 12 Control circuits . 51 12.1 General requirement 51 12.2 Isolation of control circuits . 51 12.3 Working voltages of remote control circuits 51 13 Hazard reducing device 51 13.1 General requirements 51 13.2 Types of hazard reducing devices 52 13.2.1 Voltage reducing
45、 device . 52 13.2.2 Switching device for a.c. to d.c. 52 13.3 Requirements for hazard reducing devices . 52 13.3.1 Disabling the hazard reducing device . 52 13.3.2 Interference with operation of a hazard reducing device . 52 13.3.3 Indication of satisfactory operation . 53 13.3.4 Fail to a safe cond
46、ition . 53 14 Mechanical provisions . 53 14.1 General requirements 53 14.2 Enclosure 53 14.2.1 Enclosure materials . 53 14.2.2 Enclosure strength . 53 14.3 Handling means . 54 14.3.1 Mechanised handling . 54 14.3.2 Manual handling 54 14.4 Drop withstand 55 14.5 Tilting stability . 55 15 Rating plate
47、 55 15.1 General requirements 55 15.2 Description 55 15.3 Contents 56 15.4 Tolerances 59 15.5 Direction of rotation . 60 16 Adjustment of the output . 60 16.1 Type of adjustment 60 16.2 Marking of the adjusting device 60 BS EN 60974-1:201260974-1 IEC:2012 5 16.3 Indication of current or voltage cont
48、rol . 60 17 Instructions and markings . 61 17.1 Instructions 61 17.2 Markings . 62 Annex A (informative) Nominal voltages of supply networks 63 Annex B (informative) Example of a combined dielectric test 64 Annex C (normative) Unbalanced load in case of a.c. tungsten inert-gas welding power sources
49、. 65 Annex D (informative) Extrapolation of temperature to time of shutdown . 67 Annex E (normative) Construction of supply circuit terminals 68 Annex F (informative) Cross-reference to non-SI units 70 Annex G (informative) Suitability of supply network for the measurement of the true r.m.s. value of the supply current . 71 Annex H (informative) Plotting of static characteristics 72 Annex I (normative) Test methods for a 10 Nm impact 73 Annex J (normative) Thickness of sheet metal for enclosu
