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1、BRITISH STANDARD BS EN 60974-6:2003 Incorporating Corrigendum No. 1 Arc welding equipment Part 6: Limited duty manual metal arc welding power sources The European Standard EN 60974-6:2003 has the status of a British Standard ICS 25.160.30 ? BS EN 60974-6:2003 This British Standard was published unde
2、r the authority of the Standards Policy and Strategy Committee on 17 April 2003 BSI 12 December 2005 ISBN 0 580 41573 2 National foreword This British Standard is the official English language version of EN 60974-6:2003, including Corrigendum May 2005. It is identical with IEC 60974-6:2003. It super
3、sedes BS 638-9:1990 (EN 50060:1989) which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/6, Arc welding equipment, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any en
4、quiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The B
5、ritish Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards
6、Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
7、 inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 15792 Corrigendum No. 1 12 December 2005Addition of s
8、upersession details to EN title page, EN foreword and addition of footnote to Annex ZA EUROPEAN STANDARD EN 60974-6 NORME EUROPENNE EUROPISCHE NORM April 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektr
9、otechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60974-6:2003 E ICS 25.160.30 Supersedes EN 50060:1989 + A1:1994 Incorporates Corrigendum May 2005
10、English version Arc welding equipment Part 6: Limited duty manual metal arc welding power sources (IEC 60974-6:2003) Matriel de soudage larc Partie 6: Sources de courant de soudage manuel larc metallique service limit (CEI 60974-6:2003) Lichtbogenschweieinrichtungen Teil 6: Schweistromquellen mit be
11、grenzter Einschaltdauer (IEC 60974-6:2003) This European Standard was approved by CENELEC on 2003-03-01. 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 altera
12、tion. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tra
13、nslation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greec
14、e, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 26/247/FDIS, future edition 1 of IEC 60974-6, prepared by IEC TC 26, Electric welding, was submitted to the IEC-CENELEC parall
15、el vote and was approved by CENELEC as EN 60974-6 on 2003-03-01. This European Standard supersedes EN 50060:1989 + A1:1994. This Part 6 of EN 60974 is to be used in conjunction with EN 60974-1:1998. The following dates were fixed: latest date by which the EN has to be implemented at national level b
16、y publication of an identical national standard or by endorsement (dop) 2003-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-03-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given
17、 for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. The contents of the corrigendum of May 2005 have been included in this copy. _ Endorsement notice The text of the International Standard IEC 60974-6:2003 was approved by CEN
18、ELEC as a European Standard without any modification. _ Page 2 EN 609746:2003 CONTENTS 1 Scope 5 2 Normative references .5 3 Terms and definitions .6 4 Environmental conditions7 5 Test conditions.7 5.1 Type tests .7 5.2 Routine tests .7 6 Protection against electric shock.7 6.1 Insulation 7 6.2 Prot
19、ection against electric shock in normal service (direct contact) .7 6.2.1 Protection provided by the enclosure7 6.2.2 Capacitors .8 6.2.3 Automatic discharge of input capacitors8 6.3 Protection against electric shock in case of a fault condition (indirect contact) 8 6.3.1 Insulation of the input cir
20、cuit and the welding circuit8 6.3.2 Insulation between windings of the input circuit and the welding circuit 8 6.3.3 Internal conductors and connections.8 6.3.4 Movable coils and cores.8 6.3.5 Primary leakage current .8 7 Thermal requirements.9 7.1 Heating test.9 7.1.1 Test method.9 7.1.2 Calculatio
21、n.10 7.1.3 Tolerances of the test parameters 10 7.2 Temperature measurement 10 7.2.1 Surface temperature sensor .10 7.2.2 Resistance.10 7.2.3 Embedded temperature sensor.11 7.2.4 Determination of the ambient air temperature .11 7.2.5 Recording of temperatures .11 7.3 Limits of temperature rise 11 7.
22、3.1 Windings11 7.3.2 External surfaces .11 7.4 Loading test 11 8 Abnormal operation 11 9 Thermal cut-out device .12 9.1 Operation 12 9.2 Resetting.12 9.3 Operating capacity.12 10 Connection to the input supply12 10.1 Supply voltage.12 10.2 Power supply.12 10.3 Means of connection12 10.4 Input supply
23、 terminals12 Page 3 EN 609746:2003 10.5 Cable anchorage .12 10.6 Inlet openings13 10.7 Input supply on/off switching device .13 10.8 Supply cables13 10.9 Supply coupling device (attachment plug).13 11 Output13 11.1 Rated no-load voltage (U0).13 11.2 Type test values of the conventional load voltage.
24、14 11.3 Mechanical switching devices used to adjust output .14 11.4 Welding output connections .14 11.5 Welding cables14 12 Control circuits .14 13 Hazard reducing device 14 14 Mechanical requirements15 14.1 Enclosure15 14.2 Impact resistance of handles, push buttons, etc. 15 14.3 Handling means.15
25、14.4 Drop withstand 15 14.5 Tilting stability .15 15 Rating plate15 15.1 Description15 15.2 Contents .16 15.3 Tolerances 17 16 Adjustment of the output.18 16.1 Type of adjustment 18 16.2 Marking of the adjusting device18 16.3 Indication of current or voltage control .18 17 Instructions and markings
26、.18 Annex A (informative) Examples of rating plates (see 15.1) .19 Annex ZA (normative) Normative refereneces tro international publications with their corresponding European publications20 Figure 1 Principle of the rating plate.16 Figure A.1 Rating plate 19 Figure A.2 Subdivided rating plate19 Tabl
27、e 1 Rated welding currents based on the reference electrode.9 Table 2 Summary of allowable rated no-load voltages.13 Page 4 EN 609746:2003 ARC WELDING EQUIPMENT Part 6: Limited duty manual metal arc welding power sources 1 Scope This part of IEC 60974 is applicable to power sources with a thermal cu
28、t-out device for manual metal arc welding with limited duty. These welding power sources are mainly used by laymen. This part of IEC 60974 specifies safety requirements for construction and performance requirements of welding power sources, limited to a rated maximum welding current of 160 A. This p
29、art of IEC 60974 is not applicable to: rotating welding power sources; welding power sources with remote control; welding power sources incorporating frequency conversion. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refe
30、rences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-151:2001, International Electrotechnical Vocabulary (IEV) Part 151: Electrical and magnetic devices IEC 60050-851:1991, International Electrotec
31、hnical Vocabulary (IEV) Chapter 851: Electric welding IEC 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General requirements IEC 60245-6, Rubber insulated cables rated voltages up to and including 450/750 V Part 6: Arc welding electrode cables IEC 60664-1:1992, Insul
32、ation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests IEC 60974-1:1998, Arc welding equipment Part 1: Welding power sources IEC 61032:1997, Protection of persons and equipment by enclosures Probes for verification Page 5 EN 609746:2003 ISO 857-1, Weld
33、ing and allied processes Vocabulary Part: 1 Metal welding processes ISO 2560, Covered electrodes for manual arc welding of mild steel and low alloy steel Code of symbols for identification 3 Terms and definitions For the purpose of this part of IEC 60974, the terms and definitions contained in IEC 6
34、0050-151, IEC 60050-851, IEC 60204-1, IEC 60664-1 and in IEC 60974-1, as well as the following apply: 3.1 manual metal arc welding manually operated metal-arc welding using a covered electrode ISO 857-1, 4.2.4.4 3.2 limited duty welding power source power source whose operating condition is defined
35、by the sets and resets (OFF and ON operation) of its thermal cut-out device 3.3 reference electrode electrode of the type E 43 R with a diameter and rated welding current in accordance with ISO 2560 3.4 layman operator who does not weld in the performance of his profession and may have little or no
36、formal instruction in arc welding 3.5 thermal cut-out device temperature sensitive device which limits the temperature of the components of the welding power source by automatically opening the circuits or by reducing the currents, and being reset automatically 3.6 load time, tw time between the res
37、et (ON operation) and the set (OFF operation) of the thermal cut-out device 3.7 reset time, tr time between the set (OFF operation) and the reset (ON operation) of the thermal cut-out device 3.8 cycle time time between two consecutive resets (ON operation) or sets (OFF operation) of the thermal cut-
38、out device Page 6 EN 609746:2003 3.9 maximum effective supply current (I1eff) maximum value of effective input current calculated by the formula : rw r 2 0 rw w2 11 tt t I tt t II eff + + + = where tw is the load time; tr is the reset time; I1 is the rated supply current; I0 is the rated no-load sup
39、ply current. 4 Environmental conditions As specified in IEC 60974-1, Clause 4. 5 Test conditions As specified in IEC 60974-1, Clause 5 with the following modification: The ambient air temperature during the heating test shall not be less than 20 C. 5.1 Type tests As specified in IEC 60974-1, 5.1 wit
40、h the following modification: Replace the type test d) thermal protection as specified in IEC 60974-1, 5.1 by the type test “thermal cut-out device” as specified in Clause 9 of this part of IEC 60974. 5.2 Routine tests As specified in IEC 60974-1, 5.2 with the following modifications: The test for r
41、ated minimum welding current does not apply. Routine tests may be carried out in short circuit condition, according to the manufacturers test procedure. 6 Protection against electric shock 6.1 Insulation As specified in IEC 60974-1, 6.1. 6.2 Protection against electric shock in normal service (direc
42、t contact) 6.2.1 Protection provided by the enclosure As specified in IEC 60974-1, 6.2.1. Page 7 EN 609746:2003 Additionally, the enclosure shall be such that a) a 50 mm long test pin (see IEC 61032 test finger 12) cannot be inserted from all sides except the underside and b) a 15 mm long test pin (
43、see IEC 61032 test finger 13) cannot be inserted from the underside; to touch: a) live parts of the input circuit or b) in the case of Class II welding power sources, any metal part which is separated from live parts only by basic insulation. Conformity shall be checked in accordance with IEC 61032.
44、 6.2.2 Capacitors As specified in IEC 60974-1, 6.2.2. 6.2.3 Automatic discharge of input capacitors As specified in IEC 60974-1, 6.2.3. 6.3 Protection against electric shock in case of a fault condition (indirect contact) 6.3.1 Insulation of the input circuit and the welding circuit As specified in
45、IEC 60974-1, 6.3.1. 6.3.2 Insulation between windings of the input circuit and the welding circuit As specified in IEC 60974-1, 6.3.2. 6.3.3 Internal conductors and connections As specified in IEC 60974-1, 6.3.3. 6.3.4 Movable coils and cores If movable coils or cores are used to adjust the welding
46、current, the construction shall be such that the prescribed clearances and creepage distances are maintained, taking into account electrical and mechanical stresses. 6.3.5 Primary leakage current The primary leakage current from exposed conductive surfaces to the supply coupling device or to the ext
47、ernal protective conductor terminal shall not exceed 5 mA under the following conditions: the welding power source is: isolated from the ground plane; supplied by the highest rated supply voltage; not connected to the protective earth; the output circuit is in the no-load condition; primary capacito
48、rs are not disconnected; interference suppression capacitors are either connected or disconnected. Page 8 EN 609746:2003 Conformity shall be checked by a meter of the following type: electronic or direct indicating; terminal impedance of 1 500 , shunted by a 0,15 F capacitor; average responding; cal
49、ibrated at 50/60 Hz; indicating the r.m.s. value of a pure sine wave with an accuracy of 5 %, at an indication of 0,5 mA. 7 Thermal requirements The thermal requirements for welding power sources shall be: a) for windings, in accordance with 7.3.1; b) for external surfaces, in accordance with 7.3.2; c) for the welding power source, in accordance with 7.4; d) for the materials of other parts, in