ANSI NEMA IEC 60974-1-2008 Arc Welding Equipment Part 1 Welding Power Sources.pdf

1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/IEC 60974-1:2008 Arc Welding EquipmentPart 1: Welding Power SourcesApproved as an American National Standard ANSI Approval Date: December 30, 2008 Adoption of IEC 60974-1, Ed. 3 (2005) ANSI/IEC 60974-1: 2008 Arc Welding Equi

2、pment Part 1: Welding Power Sources Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Copyright 2008 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved

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18、ddressed to the secretariat or sponsor whose name appears on the title page of this standard. Caution Notice: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, re

19、vise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National Electrical Manufacturers Association 1300 North 17th Street, Rosslyn, VA 22209 Copyright

20、2008 by National Electrical Manufacturers Association All rights reserved including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Convention

21、s. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Printed in the United States of America This page intentionally left blank. 60974-1 IEC:2005 5 CONTENTS 1 Scope.21 2 Normative referenc

22、es21 3 Terms and definitions .23 4 Environmental conditions 30 5 Tests 30 6 Protection against electric shock.33 7 Thermal requirements.44 8 Abnormal operation.49 9 Thermal protection50 10 Connection to the input supply network .52 11 Output 58 12 Control circuits .64 13 Hazard reducing device 65 14

23、 Mechanical provisions.66 15 Rating plate 69 16 Adjustment of the output .74 17 Instructions and markings .75 Annex A (informative) Nominal voltages of supply networks80 Annex B (informative) Example of a combined dielectric test 81 Annex C (normative) Unbalanced load in case of a.c. tungsten inert-

24、gas welding power sources 82 Annex D (informative) Extrapolation of temperature to time of shutdown .85 Annex E (normative) Construction of supply circuit terminals 86 Annex F (informative) Cross-reference to non-SI units88 Annex G (informative) Suitability of supply network for the measurement of t

25、he true r.m.s. value of the supply current 89 Annex H (informative) Plotting of static characteristics90 Annex I (normative) Test methods for a 10 Nm impact.91 Annex J (normative) Thickness of sheet metal for enclosures .93 Annex K (informative) Examples of rating plates.95 Annex L (informative) Gra

26、phical symbols for arc welding equipment .99 Annex M (informative) Efficiency 122 Annex N (normative) Primary leakage current measurement.123 Figure 1 Measurement of leakage current of welding circuit 41 Figure 2 Measuring network for primary leakage current .43 Figure 3 Measurement of peak values 6

27、1 Figure 4 Principle of the rating plate .70 60974-1 IEC:2005 6 Figure 5 Carbon monoxide precautionary marking 78 Figure B.1 Combined high-voltage transformers .81 Figure C.1 Voltage and current during a.c. tungsten inert-gas welding.82 Figure C.2 Unbalanced voltage during a.c. tungsten inert-gas we

28、lding 83 Figure C.3 AC welding power source with unbalanced load .84 Figure I.1 Test set-up .91 Figure K.1 Single-phase transformer 95 Figure K.2 Three-phase rotating frequency converter96 Figure K.3 Subdivided rating plate: single-/three-phase transformer rectifier .97 Figure K.4 Engine-generator-r

29、ectifier98 Figure L.1 Input voltage power switch.120 Figure L.2 Arc force control potentiometer 120 Figure L.3 Remote receptacle and selector switches.120 Figure L.4 Terminals with inductance selector for MIG/MAG welding.120 Figure L.5 Process switch (MMA, TIG, MIG) .121 Figure L.6 Selector switch o

30、n AC/DC equipment .121 Figure L.7 Panel indicator lights (overheat, fault, arc striking, output voltage).121 Figure L.8 Setting pulsing parameters using digital display121 Figure N.1 Diagram for leakage current meaurement at operating temperature for single-phase connection of appliances other than

31、those of class II.123 Figure N.2 Diagram for leakage current meaurement at operating temperature for three-phase connection of appliances other than those of class II.124 Figure N.3 Diagram for leakage current measurement at operating temperature for single-phase connection of class II appliances.12

32、5 Figure N.4 Diagram for leakage current measurement at operating temperature for three-phase connection of class II appliances127 60974-1 IEC:2005 7 Table 1 Minimum clearances for overvoltage category III 34 Table 2 Minimum creepage distances.36 Table 3 Insulation resistance37 Table 4 Dielectric te

33、st voltages.37 Table 5 Minimum distance through insulation41 Table 6 Limits of temperature rise for windings, commutators and slip-rings .47 Table 7 Limits of temperature rise for external surfaces47 Table 8 Cross-section of the output short-circuit conductor .50 Table 9 Current and time requirement

34、s for protective circuits54 Table 10 Minimum cross-sectional area of the external protective copper conductor .54 Table 11 Verification of continuity of the protective bonding circuit 55 Table 12 Pull56 Table 13 Summary of allowable rated no-load voltages.60 Table 14 Hazard reducing device requireme

35、nts.65 Table E.1 Range of conductor dimensions to be accepted by the supply circuit terminals 86 Table E.2 Spacing between supply circuit terminals 87 Table F.1 Cross-reference for mm2to American wire gauge (AWG) .88 Table F.2 Cross reference for kW to horsepower (hp).88 Table I.1 Mass of the free f

36、all weight and height of the free fall .92 Table J.1 Minimum thickness of sheet metal for steel enclosures93 Table J.2 Minimum thickness of sheet metal for enclosures of aluminium, brass or copper 94 Table L.1 Letters used as symbols .100 60974-1 IEC:2005 8 FOREWORD FOR U.S. ADOPTION This American N

37、ational Standard is an adoption of IEC 60974-1 edition 3, Arc Welding Equipment Part 1: Welding power sources, and was developed and approved in accordance with procedures set forth by the American National Standards Institute. It is envisioned that this document will ultimately supersede ANSI/UL 60

38、974-1, which was an adoption of IEC 60974-1, edition 2 and its amendment 1. This standard contains all the original text as-is from IEC 60974-1, edition 3, in addition to a number of U.S. Differences to the IEC standard that were identified by Accredited Standards Committee W1, Requirements for Appa

39、ratus Designed for Use in Arc Welding, Plasma Arc Cutting, and Allied Processes. Each U.S. Difference is found both in a compilation of U.S. differences following this foreword, and inserted in the appropriate place(s) in the standard relating to the difference. Each insertion is in red text and is

40、marked by three lines on its left (two thin, one thick). Each Difference is identified with the following format: Clause/Subclause NumberDVNumber of Difference for the Given Clause/Subclause Following this format, the example 17.1DV.3 signifies that it is the third U.S. Difference to subclause 17.1.

41、 Suggestions for the improvement of this standard are welcome and should be submitted to the Secretariat of Accredited Standards Committee W1 as follows: Greg Winchester, ASC W1 Secretary c/o National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, VA 22209 Fax 703-8

42、41-3399 Email gre_winchesternema.org This standard was processed and approved by the Accredited Standards Committee W1. Committee approval does not necessarily imply that all Committee members voted for its approval. At the time this standard was published, Accredited Standards Committee W1 consiste

43、d of the following members: 60974-1 IEC:2005 9 John Freudenberg, Chairman Wayne Hoffman, Vice Chairman Greg Winchester, Secretary Organization Represented Name of Representative American Welding Society Andrew Davis principal Dick Holdren alternate CenterLine (Windsor) Limited David Beneteau CSA Int

44、ernational Andrew Krumins ESAB Welding and Cutting Charles Aimar Hypertherm Inc. Tony Zeller principal Bill Lynn alternate Lincoln Electric Company Frank Stupczy principal Gary Mikitin alternate Miller Electric Manufacturing Company David Werba principal Terry Christianson alternate Northeast Produc

45、t Safety Society John Freudenberg Wayne Hoffman Consultant / U.S. Technical Advisor, IEC TC 26 Wayne Hoffman The effective date for all new product submittals to this Standard is three (3) years after the publication date of this Standard. This effective date is established by the ANSI Accredited St

46、andards Committee W1 and is not part of this Standard. This Standard cancels and replaces the first edition of ANSI/UL 60974-1 (published March 17, 2005) on the effective date. The requirements in this Standard should be used for new product submittals made after the publication date of this Standar

47、d. If this Standard is used, a product will be evaluated under all of the requirements of this Standard. If a product within the scope of this Standard was listed to ANSI/UL 60974-1 or ANSI/UL 551, compliance with all the requirements in this Standard will be required as a condition of continued Lis

48、ting after June 30, 2023. 60974-1 IEC:2005 10 COMPILATION OF U.S. DIFFERENCES NOTE This section is an integral part of American National Standard ANSI/IEC 60974-1. See the section “Foreword for U.S. Adoption“ for an explanation of the format used to identify U.S. Differences. ForewordDV.1 Modify the

49、 foreword by adding the following: The numbering system in this standard uses a space instead of a comma to indicate thousands and uses a comma instead of a period to indicate a decimal point. For example, 1 000 means 1,000 and 1,01 means 1.01. 2DV.1 Modify clause 2 by deleting the reference to IEC 60309-1 2DV.2 Modify clause 2 by adding the following to the list of normative references: IEC 62114, Electrical Insulation Syst