1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI/IEC 60974-8:2008Arc Welding Equipment - Part 8: Gas Consoles for Welding and Plasma Cutting SystemsApproved as an American National Standard ANSI Approval Date: April 3, 2009 Adoption of IEC 60974-8, Ed. 1 (2004) ANSI/IEC 60
2、974-8:2008 Arc Welding Equipment Part 8: Gas Consoles for Welding and Plasma Cutting Systems Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Copyright 2009 by the National Electrical Manufacturers Association. All rig
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5、tion was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The Nati
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14、TIONAL STANDARD Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, su
15、bstantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution
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17、n National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Stan
18、dards Institute. Requests for interpretations should be addressed 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 Caution Notice: This American National Standard may be revised or withdrawn at any time.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
19、require that action be taken periodically to reaffirm, revise, 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 Associa
20、tion 1300 North 17th Street, Rosslyn, VA 22209 Copyright 2009 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, an
21、d the International and Pan American Copyright Conventions. 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.ANS
22、I/IEC 60974-8-2008 - 5 - FOREWORD FOR U.S. ADOPTION This American National Standard is an adoption of IEC 60974-8 edition 1, Arc welding equipmentPart 8: Gas consoles for welding and plasma cutting systems, and was developed and approved in accordance with procedures set forth by the American Nation
23、al Standards Institute. It is the intention that this American National Standard be a standalone document, replacing the use of IEC 60974-8 in the U.S. As such, any reference in this standard to an IEC 60974 part is understood to mean a reference to the equivalent ANSI/IEC 60974 part, where it exist
24、s. This standard contains all the original text as-is from IEC 60974-8, edition 1, in addition to a number of U.S. Differences to the IEC standard that were identified by Accredited Standards Committee W1, Requirements for Apparatus Designed for Use in Arc Welding, Plasma Arc Cutting, and Allied Pro
25、cesses. 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 marked on its left by three lines (two thin, one thick). Each U.S. Differ
26、ence is identified with the following format: Clause/Subclause NumberDV.Number 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. Suggestions for the improvement of this standard are welcome and s
27、hould 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 703-841-3399Email gre_winchesternema.org This standard was processed and
28、 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 approved, Accredited Standards Committee W1 consisted of the following members: John Freudenberg, Chairman Wayne Hoffman,
29、 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 International Andrew Krumins ESAB Welding and Cutting Charles Aimar Hypertherm Inc. Tony Ze
30、ller principal Bill Lynn alternate Lincoln Electric Company Frank Stupczy principal Gary Mikitin alternate Miller Electric Manufacturing Company David Werba principal Terry Christianson-Plato alternate Mike Madsen alternate Northeast Product Safety Society John Freudenberg Wayne Hoffman Consultant /
31、 U.S. Technical Advisor, IEC TC 26 Wayne Hoffman ANSI/IEC 60974-8-2008 - 6 - COMPILATION OF U.S. DIFFERENCES NOTE This section is an integral part of American National Standard ANSI/IEC 60974-8. See the section “Foreword for U.S. Adoption“ for an explanation of the format used to identify U.S. Diffe
32、rences. GlobalDV.1 Throughout this document, replace the phrase “this part of IEC 60974“ to “this part of ANSI/IEC 60974“ ForewordDV.1 Modify the foreword by adding the following text at the end: The numbering system in this standard uses a space instead of a comma to indicate thousands and uses a c
33、omma instead of a period to indicate a decimal point. For example, 1 000 means 1,000 and 1,01 means 1.01. 1DV.1 Modify clause 1 by adding the following: This part of IEC 60974 does not include gas consoles intended for use in hazardous locations (i.e., explosive atmospheres) as defined in ANSI/UL 60
34、079 and in Article 500 of ANSI/NFPA 70. NOTE The placement of an ANSI/IEC 60974-8-compliant gas console in a location is not intended to change the classification of that location. 2DV.1 Modify clause 2 by deleting IEC 60079-10:2002, IEC 60079-11:1999, and IEC 60079-14:2002 as normative references 2
35、DV.2 Modify clause 2 by changing the date on the IEC 60529 reference from 1989 to 2001 2DV.3 Modify clause 2 by replacing the IEC 60974-1 and amendments reference with a reference to ANSI/IEC 60974-1 and adding the following text and note: All subsequent references in this standard to IEC 60974-1 sh
36、all be a reference to ANSI/IEC 60974-1. NOTE ANSI/IEC 60974-1-2008 contains the entire original text from IEC 60974-1:2005 plus U.S. Differences. 3DV.1 Modify clause 3 by replacing the IEC 60974-1 reference with a reference to ANSI/IEC 60974-1 3.4DV.1 Modify clause 3 by deleting 3.4 5.1DV.1 Modify 5
37、.1 by changing the first paragraph to: As specified in ANSI 60974-1, 5.4. 5.2.1DV.1 Modify 5.2.1 by changing the IEC 60974-1 subclause reference in list item (j) from 6.1.4 to 6.1.5 5.2.2DV.1 Modify 5.2.2 by changing the IEC 60974-1 clause reference from 5.2 to 5.5 6DV.1 Modify clause 6 by replacing
38、 its text with the following: Components, which due to failure may increase the risk of a hazard, shall comply with the requirements of this document or with the requirements of the relevant ANSI standards. NOTE 1 An ANSI component standard is considered relevant only if the component in question fa
39、lls within its scope. ANSI/IEC 60974-8-2008 - 7 - Evaluation and testing of components for correct application in the equipment shall be carried out in one of the following ways: a) Where a component has been certified by a recognized testing authority for compliance with a relevant ANSI component s
40、tandard, that component shall be checked for correct application in accordance with its rating. The component shall be tested in accordance with this part of ANSI/IEC 60974 with the exception of those tests that are part of the relevant ANSI component standard. b) Where a component has been certifie
41、d by a recognized testing authority for compliance with a relevant ANSI component standard, but is not being used in accordance with its specified ratings, that component shall be tested in accordance with this part of IEC 60974. c) Where a component has not been certified by a recognized testing au
42、thority for compliance with a relevant ANSI component standard, that component shall be checked for correct application in the equipment by testing the component in accordance with this part of ANSI/IEC 60974 or in accordance with the applicable tests of the relevant ANSI component standard. NOTE 2
43、The applicable test for compliance with a component standard is typically carried out separately. The number of test samples is typically the same as that required in the component standard. d) Where a component has not been certified by a recognized testing authority for compliance with a relevant
44、ANSI component standard because no such standard exists, that component shall be tested in accordance with this part of ANSI/IEC 60974. e) Where a component has been certified by a recognized testing authority for compliance to a non-ANSI standard, that component shall be deemed acceptable for use i
45、n the equipment provided that the applicable safety requirements of the non-ANSI standard are at least as high as those of a relevant ANSI standard. The component shall be tested in accordance with this part of ANSI/IEC 60974 with the exception of those tests that are part of the non-ANSI component
46、standard. 8.1DV.1 Modify 8.1 by replacing the IEC 60974-1 reference with a reference to ANSI/IEC 60974-1 9DV.1 Modify clause 9 by adding the following note: NOTE A gas leak from a valve, hose or connection in the fuel gas distribution system is considered a single fault condition. 10DV.1 Modify clau
47、se 10 by replacing the IEC 60974-1 reference with a reference to ANSI/IEC 60974-1 10.3.3DV.1 Modify clause 10 by deleting 10.3.3 10.3.4DV.1 Modify 10.3.4 by replacing its text with the following: 10.3.4.1 Prevention of ignition The gas console shall be designed to prevent an ignition caused by a gas
48、 leak in the enclosure. Conformity shall be checked by completing the following test: a) Place the energized equipment, i.e., the external gas console or the power source with internal gas console, in a bag (or similar); b) Simulate a gas leak inside the equipment to create an internal explosive atm
49、osphere; c) Monitor the mixture until it is halfway between the LEL and the UEL of the gas; ANSI/IEC 60974-8-2008 - 8 - d) Operate the gas console for a period of at least 1 h, during which all components capable of causing ignition are cycled at least 100 times; e) Verify that no ignition occurred during the operating period; f) Ignite the bag (or similar) to confirm that a flammable mixture was present. 10.3.4.2 Integrity of the enclosure The enclosure, i.e., the external gas console or the power source with internal gas console, shall withstand an explosion
