1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationArc welding equipment Part 12: Coupling devices for welding cablesBS EN 60974-12:2011National forewordThis British Standard is the UK implementation of EN 60974-12:2011. It iside
2、ntical to IEC 60974-12:2011. It supersedes BS EN 60974-12:2005 which iswithdrawn.The UK participation in its preparation was entrusted to Technical CommitteeWEE/6, Electric arc welding equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This pub
3、lication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 70445 1ICS 25.160.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the
4、authority of the StandardsPolicy and Strategy Committee on 30 September 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60974-12:2011EUROPEAN STANDARD EN 60974-12 NORME EUROPENNE EUROPISCHE NORM August 2011 CENELEC European Committee for Electrotechnical Stan
5、dardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60974-12:2011
6、 E ICS 25.160.30 Supersedes EN 60974-12:2005English version Arc welding equipment - Part 12: Coupling devices for welding cables (IEC 60974-12:2011) Matriel de soudage larc - Partie 12: Dispositifs de connexion pour cbles de soudage (CEI 60974-12:2011) Lichtbogenschweieinrichtungen - Teil 12: Steckv
7、erbindungen fr Schweileitungen (IEC 60974-12:2011) This European Standard was approved by CENELEC on 2011-06-22. 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 an
8、y alteration. 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 mad
9、e by translation 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, Bulgaria, Croatia, Cyprus, the Czech Republic, D
10、enmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60974-12:2011EN 60974-12:2011 - 2 - Foreword The
11、 text of document (26/441/FDIS), future edition 3 of IEC 60974-12, prepared by IEC TC 26, Electric welding, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60974-12 on 2011-06-22. This European Standard supersedes EN 60974-12:2005. EN 60974-12:2011 includes the follo
12、wing significant technical changes with respect to EN 60974-12:2005: dimensions given in Annex A become normative; designation is based on the range of cross-sectional area of the welding cable intended to be connected. Attention is drawn to the possibility that some of the elements of this document
13、 may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (d
14、op) 2012-03-22 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-06-22 In this standard, the following print types are used: - conformity statements: in italic type. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Internation
15、al Standard IEC 60974-12:2011 was approved by CENELEC as a European Standard without any modification. _ BS EN 60974-12:2011- 3 - EN 60974-12:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents
16、 are indispensable for the application 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 When an international publication has been modified by common modifications, i
17、ndicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-151 - International Electrotechnical Vocabulary (IEV) - Part 151: Electrical and magnetic devices - - IEC 60529 - Degrees of protection provided by enclosures (IP Code) - - IEC 60974-1 - Arc welding equipment
18、- Part 1: Welding power sources EN 60974-1 - BS EN 60974-12:2011 2 60974-12 IEC:2011 CONTENTS 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Environmental conditions 6 5 Type tests 6 5.1 Test conditions 6 5.2 Test sequence . 6 6 Designation 6 7 Protection against electric shock
19、 7 7.1 Voltage rating 7 7.2 lnsulation resistance 7 7.3 Dielectric strength . 8 7.3.1 General requirement 8 7.3.2 Additional requirements for striking and stabilizing voltage rating 8 7.4 Protection of live parts against unintentional contact . 8 8 Thermal rating 9 8.1 Temperature rise . 9 8.2 Resis
20、tance to hot objects 9 9 Mechanical requirements 10 9.1 Retaining means . 10 9.2 Welding cable entry . 10 9.3 Penetration of the welding cable insulation 10 9.4 Welding cable connection 10 9.5 Crush strength. 10 9.6 Dimensions . 11 10 Marking 11 11 Instructions for use . 11 Annex A (normative) Dimen
21、sions . 12 Figure 1 Device for testing the resistance to hot objects 9 Figure A.1 Male element 12 Figure A.2 Female element 12 Table 1 Relation between coupling device test current and welding cables cross-sectional area . 7 Table 2 Voltage rating of coupling devices . 7 Table 3 Crush force . 11 Tab
22、le A.1 Dimensions for Figures A.1 and A.2 . 13 BS EN 60974-12:201160974-12 IEC:2011 5 ARC WELDING EQUIPMENT Part 12: Coupling devices for welding cables 1 Scope This part of IEC 60974 is applicable to coupling devices for cables used in arc welding and allied processes, designed for connection and d
23、isconnection without using tools. This part of IEC 60974 specifies safety and performance requirements of coupling devices. This part of IEC 60974 is not applicable to coupling devices for underwater welding. 2 Normative references The following referenced documents are indispensable for the applica
24、tion 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. IEC 60050-151, International Electrotechnical Vocabulary (IEV) Part 151: Electrical and magnetic devices IEC 60529, D
25、egrees of protection provided by enclosures (IP Code) IEC 60974-1, Arc welding equipment Part 1: Welding power sources 3 Terms and definitions For the purposes of this document, the terms and definitions given in the IEC 60050-151, the IEC 60974-1, as well as the following apply. 3.1 coupling device
26、 device connecting two welding cables together or connecting a welding cable to welding equipment 3.2 retaining means mechanical arrangement that holds the coupling device in position and prevents an unintentional withdrawal, when properly connected 3.3 arc striking and stabilizing voltage voltage s
27、uperimposed on the welding circuit to initiate or maintain the arc BS EN 60974-12:2011 6 60974-12 IEC:2011 4 Environmental conditions The coupling device shall be capable of operation when the following environmental conditions prevail: a) range of ambient air temperature: during operation: 10 C to
28、+ 40 C; b) relative humidity of the air: up to 90 % at 20 C. The coupling device shall withstand storage and transport at an ambient air temperature of 20 C to + 55 C without any damage to function and performance. 5 Type tests 5.1 Test conditions All type tests shall be carried out on the same new
29、and completely assembled coupling device. All type tests shall be carried out at an ambient air temperature between 10 C and 40 C. The accuracy of measuring instruments shall be: a) electrical measuring instruments: class 1 ( 1 % of full-scale reading), except for the measurement of insulation resis
30、tance and dielectric strength where the accuracy of the instruments is not specified, but shall be taken into account for the measurement; b) temperature measuring devices: 2 K. 5.2 Test sequence The type tests given below shall be carried out in the following sequence: a) general visual inspection;
31、 b) temperature rise, see 8.1; c) crush strength, see 9.5; d) insulation resistance, see 7.2; e) dielectric strength, see 7.3. The other type tests in this part of IEC 60974 not mentioned above may be carried out in any convenient sequence. 6 Designation Coupling devices shall be designated by the r
32、ange of cross-sectional area of the welding cable intended to be connected. The test current at an ambient air temperature of 40 C is given in Table 1 based on maximum cross-section area. The welding coupling device shall accept the minimum cross-sectional area as given in Table 1. Minimum cross-sec
33、tional area may be reduced to extend the coupling device fitting range. BS EN 60974-12:201160974-12 IEC:2011 7 Table 1 Relation between coupling device test current and welding cables cross-sectional area Range of cross-sectional area mm2Coupling device test current at 60 % duty cycle A up to 10 125
34、 10 to 16 150 16 to 25 200 25 to 35 250 35 to 50 300 50 to 70 400 70 to 95 500 NOTE Welding cables are rated based on cross-sectional area. Test current is defined in order that coupling device withstands the rated current of the welding cable. Conformity shall be checked by measurement. 7 Protectio
35、n against electric shock 7.1 Voltage rating Coupling devices shall be rated in accordance with the process as given in Table 2 and the arc striking and stabilizing voltage if applicable. Table 2 Voltage rating of coupling devices Process Voltage rating V peak Insulation resistance M Dielectric stren
36、gth V r.m.s. Degree of protection in accordance with IEC 60529 All processes except plasma cutting 113 2,5 1 000 IP 3X Plasma cutting 500 2,5 2 100 IP 3X 7.2 lnsulation resistance The insulation resistance of a new coupling device shall, after the humidity treatment, be not less than 2,5 M. Conformi
37、ty shall be checked by the following test. a) Humidity treatment A humidity cabinet is maintained at a temperature t between 20 C and 30 C and a relative humidity between 91 % and 95 %. The coupling device without cables fitted is brought to a temperature between t and t + 4 K and is then placed for
38、 48 h in the humidity cabinet. b) Insulation resistance measurement Immediately after the humidity treatment, the coupling device is wiped clean and tightly wrapped in a metal foil covering the external surface of the insulation. BS EN 60974-12:2011 8 60974-12 IEC:2011 The insulation resistance is m
39、easured by application of a d.c. voltage of 500 V between the live parts and the metal foil, the reading being made after stabilization of the measurement. 7.3 Dielectric strength 7.3.1 General requirement The insulation shall withstand an a.c. test voltage of 1 000 V r.m.s. without flashover or bre
40、akdown. Any discharges unaccompanied by a voltage drop are disregarded. Conformity shall be checked by the following test. The coupling device is wiped clean and tightly wrapped in a metal foil covering the external surface of the insulation. The a.c. test voltage shall be of an approximate sine wav
41、eform with a peak value not exceeding 1,45 times the r.m.s. value, having a frequency of 50 Hz or 60 Hz, applied for 1 min between the live parts and the metal foil. 7.3.2 Additional requirements for striking and stabilizing voltage rating For couplers for use with arc striking and stabilizing volta
42、ge, the insulation shall withstand the rated peak arc striking and stabilizing voltage as rated by the manufacturer. The insulation shall withstand a high frequency voltage of pulse width 0,2 s to 8 s, a repetition frequency of 50 Hz to 300 Hz and shall be 20 % higher than the rated peak arc strikin
43、g and stabilizing voltage as determined by the manufacturer. Conformity shall be checked by the following test. For couplers intended for use with arc striking and stabilizing voltage, the couplers shall be subjected to the high-frequency test voltage. The full value of the high-frequency voltage is
44、 applied for 2 s between the electrode circuit and a) conductive surfaces; b) other isolated circuits. Flashover or breakdown shall not occur. Any discharges unaccompanied by a voltage drop (corona) are disregarded. Alternatively, for couplers intended for use with arc striking and stabilizing volta
45、ge, an a.c. test voltage of approximately sine waveform at 50 Hz or 60 Hz may be used. 7.4 Protection of live parts against unintentional contact Parts designed to carry welding current and likely to be live after disconnection shall be recessed to a depth of at least 10 % of the internal diameter o
46、f the insulation with a minimum depth of 2 mm with respect to the insulating body. As a consequence, insulation has to be able to withstand normal service conditions so that the protecting length is maintained during the life of the coupling device. Conformity shall be checked by linear measurement
47、and visual inspection. BS EN 60974-12:201160974-12 IEC:2011 9 8 Thermal rating 8.1 Temperature rise The temperature rise caused by the current passing through a coupling device normally coupled and fitted with an untinned copper welding cable of maximum cross-sectional area as indicated in Table 1 s
48、hall not exceed 45 K at the hottest spot of the external surface. Conformity shall be checked by the following test. The coupling device is normally coupled and fitted with at least 2 m long welding cables. The coupling device is suspended by its welding cables from two wooden laths 1 m apart, hangi
49、ng between the two laths in the horizontal plane about 200 mm above the ground in a draught-free area. A continuous d.c. current equal to 75 % of the test current (equivalent to approximately 60 % duty cycle) is passed through the coupling device until the rate of the temperature rise does not exceed 2 K/h. During the total test time, the d.c. current shall be kept constant with a tolerance of 2 %. 8.2 Resistance to hot objects The insulation shall be
