1、 IEC 60974-8Edition 2.0 2009-02INTERNATIONAL STANDARD NORME INTERNATIONALEArc welding equipment Part 8: Gas consoles for welding and plasma cutting systems Matriel de soudage larc Partie 8: Consoles de gaz pour soudage et systmes de coupage plasma IEC60974-8:2009 THIS PUBLICATION IS COPYRIGHT PROTEC
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16、.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60974-8Edition 2.0 2009-02INTERNATIONAL STANDARD NORME INTERNATIONALEArc welding equipment Part 8: Gas consoles for welding and plasma cutting systems Matriel de soudage larc Partie 8: Consoles de gaz pour soudage et systmes de coupage plasma INTER
17、NATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE QICS 25.160 PRICE CODECODE PRIXISBN 2-8318-1027-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60974-8 IEC:2009 CONTENTS FOREWORD.4
18、 1 Scope.6 2 Normative references .6 3 Terms and definitions .6 4 Environmental conditions7 5 Tests 7 5.1 Test conditions7 5.2 Measuring instruments 7 5.3 Conformity of components.7 5.4 Type tests .7 5.5 Routine tests .8 5.5.1 External gas console .8 5.5.2 Internal gas console 8 6 Protection against
19、 electric shock 8 6.1 Insulation 8 6.2 Protection against electric shock in normal service (direct contact) .8 6.2.1 Protection provided by the enclosure.8 6.2.2 Capacitors.8 6.3 Protection against electric shock in case of a fault condition (indirect contact) 8 7 Thermal requirements.9 7.1 Heating
20、test.9 7.2 Maximum temperature.9 8 Connections for plasma cutting torches 9 9 Mechanical requirements9 9.1 Protection against fire or explosion9 9.2 Gas line purging 9 9.3 Enclosure10 9.3.1 Design requirements10 9.3.2 Enclosure purging10 9.3.3 Safe design of gas console11 9.3.4 Open structure.11 9.3
21、.5 Solid filled enclosure .11 9.4 External gas console .11 9.5 Internal gas console 12 10 Gas lines 12 10.1 Gas hoses and tubing12 10.2 Gas fittings12 10.3 Leak test .12 11 Control circuits .13 12 Rating plate13 12.1 External gas console .13 12.2 Internal gas console 13 13 Instructions and markings.
22、14 13.1 Instructions .14 13.2 Marking .14 60974-8 IEC:2009 3 Annex A (informative) Mechanized plasma system diagram .15 Annex B (informative) Example of a rating plate layout 16 Bibliography17 Figure A.1 Example of a mechanized plasma system.15 Figure B.1 Principle of a rating plate 16 Table 1 Colou
23、r coding and marking12 4 60974-8 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ARC WELDING EQUIPMENT Part 8: Gas consoles for welding and plasma cutting systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all natio
24、nal electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical
25、 Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. In
26、ternational, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The
27、formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendation
28、s for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end use
29、r. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication
30、shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No l
31、iability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (i
32、ncluding legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application
33、 of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60974-8 has been prepared by IEC technical
34、 committee 26: Electric welding. This standard is to be used in conjunction with IEC 60974-1. This second edition cancels and replaces the first edition published in 2004. This edition constitutes a technical revision. The significant changes with respect to the previous edition are the following: r
35、emoval of intrinsically safe design; introduction of gas mixing function; new informative rating plate layout; induced changes due to publication of IEC 60974-1, edition 3. 60974-8 IEC:2009 5 The text of this standard is based on the following documents: CDV Report on voting 26/381/CDV 26/391/RVC Fu
36、ll information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. The French version of this standard has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decide
37、d that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under http:/webstore.iec.ch in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or a
38、mended. 6 60974-8 IEC:2009 ARC WELDING EQUIPMENT Part 8: Gas consoles for welding and plasma cutting systems 1 Scope This part of IEC 60974 specifies safety and performance requirements for gas consoles intended to be used with combustible gases or oxygen. These gas consoles are designed to supply g
39、ases for use in arc welding, plasma cutting, gouging and allied processes in non-explosive atmospheres. The gas console can be external or internal to the power source enclosure. In the latter case, this standard also applies to the power source. NOTE See Annex A for mechanised plasma system diagram
40、. 2 Normative references The following referenced documents 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. IEC 60050-151, Internati
41、onal Electrotechnical Vocabulary Part 151: Electrical and magnetic devices IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60974-1:2005, Arc welding equipment Part 1: Welding power sources 3 Terms and definitions For the purposes of this document, the following terms and defini
42、tions, as well as those of IEC 60050-151and IEC 60974-1, apply. 3.1 gas console device for gas-flow routing, mixing or both that contains electrical apparatus in a single or multiple enclosure, or open structure 3.2 lower explosion limit LEL concentration of flammable gas or vapour in air, below whi
43、ch the gas atmosphere is not explosive IEV 426-02-09, modified 11 1Figures in square brackets refer to the bibliography. 60974-8 IEC:2009 7 3.3 lower flammability limit LFL minimum concentration of combustible gas in a mixture where a combustion can be ignited by an ignition source 3.4 upper explosi
44、on limit UEL concentration of flammable gas or vapour in air, above which the gas atmosphere is not explosive IEV 426-02-10, modified 3.5 upper flammability limit UFL maximum concentration of combustible gas in a mixture where a combustion can be ignited by an ignition source 3.6 external gas consol
45、e gas console not incorporated in a power source 3.7 internal gas console gas console incorporated in a power source 3.8 single-fault condition condition in which one means for protection against hazard is defective NOTE If a singe-fault condition results unavoidably in another single-fault conditio
46、n, the two failures are considered as one single-fault condition. IEC 61010-1, definition 3.5.11, modified 7 4 Environmental conditions As specified in Clause 4 of IEC 60974-1. 5 Tests 5.1 Test conditions As specified in 5.1 of IEC 60974-1. 5.2 Measuring instruments As specified in 5.2 of IEC 60974-
47、1. 5.3 Conformity of components As specified in 5.3 of IEC 60974-1. 5.4 Type tests As specified in 5.4 of IEC 60974-1. 8 60974-8 IEC:2009 The other tests included in this standard may be carried out in any convenient sequence. 5.5 Routine tests 5.5.1 External gas console All routine tests shall be c
48、arried out on each external gas console in the following sequence: a) general visual inspection, see 3.7 of IEC 60974-1; b) continuity of protective circuit, see 10.4.2 of IEC 60974-1; c) dielectric strength, see 6.1.5 of IEC 60974-1; d) leak test, see 10.3; e) general visual inspection, see 3.7 of
49、IEC 60974-1. 5.5.2 Internal gas console All routine tests, as specified in 5.5 of IEC 60974-1, shall be carried out on each internal gas console, with the following addition: g) leak test, see 10.3. 6 Protection against electric shock 6.1 Insulation As specified in 6.1 of IEC 60974-1, with the following exception: Printed circuit boards shall be enclosed, coated, or encapsulated.
