1、BSI Standards PublicationArc welding equipmentPart 2: Liquid cooling systemsBS EN 60974-2:2013National forewordThis British Standard is the UK implementation of EN 60974-2:2013. It is identical to IEC 60974-2:2013. It supersedes BS EN 60974-2:2008 which is withdrawn.The UK participation in its prepa
2、ration 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 not purport to include all the necessary provisions of a contract. Users are responsible for its c
3、orrect application. The British Standards Institution 2013.Published by BSI Standards Limited 2013ISBN 978 0 580 74266 8 ICS 25.160.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and S
4、trategy Committee on 31 July 2013.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60974-2:2013EUROPEAN STANDARD EN 60974-2 NORME EUROPENNE EUROPISCHE NORM May 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Ele
5、ctrotechnique Europisches Komitee fr 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 ICS 25.160 Supersedes EN 60974-2:2008 Englis
6、h version Arc welding equipment - Part 2: Liquid cooling systems (IEC 60974-2:2013) Matriel de soudage larc - Partie 2: Systmes de refroidissement par liquide (CEI 60974-2:2013) Lichtbogenschweieinrichtungen - Teil 2: Flssigkeitskhlsysteme (IEC 60974-2:2013) This European Standard was approved by CE
7、NELEC 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 stand
8、ards 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 languag
9、e 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,
10、 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 EN 60974-2:2013EN 60974-2:2013 - 2 - Foreword The text of document 26/494/FD
11、IS, 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: latest date by which the document has to be implemented at national level by publication of an ident
12、ical national standard or by endorsement (dop) 2013-11-30 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-02-28 This document supersedes EN 60974-2:2008. EN 60974-2:2013 includes the following significant technical changes with respect to EN
13、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
14、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/o
15、r 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 Standar
16、d IEC 60974-2:2013 was approved by CENELEC as a European Standard without any modification. BS 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
17、 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
18、 by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60974-1 2012 Arc welding equipment - Part 1: Welding power sources EN 60974-1 2012 IEC 60974-7 - Arc welding equipment - Part 7:Torches EN 60974-7 - IEC 60974-10 - Arc welding equipment -
19、Part 10: Electromagnetic compatibility (EMC) requirements EN 60974-10 - BS EN 60974-2:2013 2 60974-2 IEC:2013 CONTENTS 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 compone
20、nts . 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 contac
21、t) . 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 Con
22、nection 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 Supp
23、ly 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 pres
24、sure 10 8.2 Thermal requirements . 11 8.2.1 Heating test . 11 8.2.2 Tolerances of test parameters . 11 BS EN 60974-2:201360974-2 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 Ratin
25、g 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-alo
26、ne 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 sy
27、stems 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 BS EN 60974-2:2013 6 60974-2 IEC:2013 ARC WELDING EQUIPMENT Part 2: Liquid cooling systems 1 Scope This pa
28、rt 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 part of IEC 60974 is applicable to stand-alone liquid cooling systems that are either connected to a separate welding p
29、ower source or built into the welding power source enclosure. This part of IEC 60974 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) requir
30、ements. 2 Normative references 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 a
31、ny amendments) applies. IEC 60974-1:2012, Arc welding equipment Part 1: Welding power sources IEC 60974-7, Arc welding equipment Part 7: Torches IEC 60974-10, Arc welding equipment Part 10: Electromagnetic compatibility (EMC) requirements 3 Terms and definitions For the purposes of this document, th
32、e terms and definitions given in IEC 60974-1 and IEC 60974-7, as well as the following apply. 3.1 cooling power P cooling energy related to the flow rate 3.2 liquid cooling system system that circulates and cools liquid used for decreasing the temperature of torches 3.3 cooling power at 1 l/min P1 l
33、/mincooling power at 1 l/min flow rate defined for comparison BS EN 60974-2:201360974-2 IEC:2013 7 4 Environmental conditions As specified in Clause 4 of IEC 60974-1:2012. 5 Tests 5.1 Test conditions As specified in 5.1 of IEC 60974-1:2012. Stand-alone cooling systems may be tested without a welding
34、 power source. Built-in cooling systems shall be tested with the welding power source. 5.2 Measuring instruments The accuracy of measuring instruments shall be: a) electrical measuring instruments: class 1 ( 1 % of full-scale reading), except for the measurement of insulation resistance and dielectr
35、ic strength where the accuracy of the instruments is not specified, but shall be taken into account for the measurement; b) thermometer: 2 K; c) pressure measuring instruments: class 2,5 ( 2,5 % of full-scale reading); d) flow-rate measuring instruments: class 2,5 ( 2,5 % of full-scale reading). 5.3
36、 Conformity of components As specified in 5.3 of IEC 60974-1:2012. 5.4 Type tests All type tests shall be carried out on the same cooling system unless specified otherwise. As a condition of conformity the type tests given below shall be carried out in the following sequence: a) general visual inspe
37、ction (as defined in 3.7 of IEC 60974-1:2012); b) protection provided by the enclosure (as specified in 6.2.1 of IEC 60974-1:2012); c) mechanical provisions (as specified in Clause 7); d) insulation resistance (as specified in 6.1.4); e) dielectric strength (as specified in 6.1.5). The other tests i
38、ncluded in this standard and not listed here may be carried out in any convenient sequence. 5.5 Routine tests All routine tests given below shall be carried out on each cooling system in the following sequence: a) visual inspection in accordance with manufacturers specification; b) continuity of the
39、 protective circuit (as specified in 10.4.2 of IEC 60974-1:2012); c) dielectric strength (as specified in 6.1.5). BS EN 60974-2:2013 8 60974-2 IEC:2013 6 Protection against electric shock 6.1 Insulation 6.1.1 General As specified in 6.1.1 of IEC 60974-1:2012. 6.1.2 Clearances As specified in 6.1.2 o
40、f IEC 60974-1:2012. 6.1.3 Creepage distances As specified in 6.1.3 of IEC 60974-1:2012. 6.1.4 Insulation resistance As specified in 6.1.4 of IEC 60974-1:2012. The test may be carried out without cooling liquid. 6.1.5 Dielectric strength As specified in 6.1.5 of IEC 60974-1:2012. The test may be carr
41、ied out without cooling liquid. 6.2 Protection against electric shock in normal service (direct contact) As specified in 6.2 of IEC 60974-1:2012. 6.3 Protection against electric shock in case of a fault condition (indirect contact) 6.3.1 Protective provisions As specified in 6.3.1 of IEC 60974-1:201
42、2. 6.3.2 Isolation between windings of the supply circuit and the welding circuit As specified in 6.3.2 of IEC 60974-1:2012. 6.3.3 Internal conductors and connections As specified in 6.3.3 of IEC 60974-1:2012. 6.3.4 Touch current in fault condition As specified in 6.3.6 of IEC 60974-1:2012. 6.4 Conn
43、ection to the supply network 6.4.1 Supply voltage As specified in 10.1 of IEC 60974-1:2012. 6.4.2 Multi-supply voltage As specified in 10.2 of IEC 60974-1:2012. BS EN 60974-2:201360974-2 IEC:2013 9 6.4.3 Means of connection to the supply circuit As specified in 10.3 of IEC 60974-1:2012. 6.4.4 Markin
44、g of terminals As specified in 10.4 of IEC 60974-1:2012. 6.4.5 Protective circuit As specified in 10.5 of IEC 60974-1:2012. 6.4.6 Cable anchorage As specified in 10.6 of IEC 60974-1:2012. 6.4.7 Inlet openings As specified in 10.7 of IEC 60974-1:2012. 6.4.8 Supply circuit on/off switching device As s
45、pecified in 10.8 of IEC 60974-1:2012. 6.4.9 Supply cables As specified in 10.9 of IEC 60974-1:2012. 6.4.10 Supply coupling device (attachment plug) For supply networks up to 125 V, the rated current of the supply coupling device (attachment plug) shall be not less than 70 % of the supply current, as
46、 measured with the fan motor or pump stalled, whichever is greater. 6.5 Leakage current between welding circuit and protective earth With the cooling system filled with the cooling liquid specified by the manufacturer (see 12.1 e), the leakage current from the torch to the protective earth connectio
47、n of the cooling system shall not exceed 10 mA d.c. Conformity shall be checked by applying a d.c. voltage of 500 V at room temperature between the protective earth connection and a copper pipe to simulate the torch connected to the output of the cooling system by a hose with a maximum length of 0,5
48、 m as shown in Figure 1. The minimum inner diameter of the hose shall be 5 mm. The minimum length of the copper pipe shall be 10 cm with a minimum internal diameter of 5 mm. The cooling system and the simulated torch are filled with liquid for the test. The pump is operating. NOTE The design of the
49、torch can influence the leakage current value; therefore, a conventional copper pipe is used to simulate the torch during the conformity test. BS EN 60974-2:2013 10 60974-2 IEC:2013 0,5 m 500 V d.c. 2 1 IEC 2209/07 2 0,1 m 3 A Key 1 Liquid cooling system 2 Hose 3 Copper pipe Figure 1 Leakage current measurement configuration 7 Mechanical provisions 7.1 General As specified in Clause 14 of IEC 60974-1:2012. The test shall be carried out with cooling liquid. 7.2 Cooling liquid overflow When
