NEMA C12 9-2014 Test Switches and Plugs for Transformer-Rated Meters.pdf

1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C12.9-2014Test Switches and Plugsfor Transformer-RatedMetersANSI C12.9-2014 Revision of ANSI C12.9-2005 American National Standard for Test Switches and Plugs for Transformer-Rated Meters Secretariat: National Electrical Man

2、ufacturers Association Approved September 17, 2014 American National Standards Institute 2014 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and approval o

3、f 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. ANSI standards and guideline publications, of which the document contained herein is one, are developed through a v

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11、fication or other statement of compliance with any health- or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. ANSI C12.9-2014 2014 National Electrical Manufacturers Association i AMERICAN NATIO

12、NAL 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, subst

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17、ire that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by Nationa

18、l Electrical Manufacturers Association 1300 North 17th Street, Suite 900, Rosslyn, Virginia 22209 2014 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of

19、Literary and Artistic Works, and 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 ANSI C1

20、2.9-2014 ii 2014 National Electrical Manufacturers Association Foreword (This foreword is not part of American National Standard C12.9-2014.) This standard is a major revision of ANSI C12.9-2005, American National Standard for Test Switches for Transformer-Rated Meters. It was developed by the Accre

21、dited Standards Committee on Electricity Metering, C12, for full consensus approval as an American National Standard. This revised version supersedes ANSI C12.9-2005. This standard covers the dimensions and functions of meter test switches for transformer-rated watthour meters when used in conjuncti

22、on with instrument transformers. It also adds specifications for test jacks used in conjunction with the test switches. These additions ensure that test jacks used in conjunction with switches meeting this standard will operate properly and safely. Suggestions for improvements of this standard are w

23、elcome. They should be in the form of a proposed change of text, together with appropriate supporting comments. Comments on standards and requests for interpretations should be addressed to: ANSI Committee C12 Secretary National Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Vi

24、rginia 22209 At the time this standard was completed, the American National Standards Committee C12 had the following membership: Tom Nelson, Chairman Paul Orr, Secretary Organization Represented: Name of Representative Ameren Services J. West Austin Energy H. Millican Baltimore Gas the other is at

25、the side of the contact jaw. f) The following sequence of tests shall be performed: 1) Apply rated current until temperatures become constant (see item b). No temperature shall exceed 30C above ambient. 2) After temperatures have become constant, apply 150% of rated current. Operate each switch for

26、18 cycles at a rate of six cycles per min. The enclosure or cover described in item c may be either left open or removed for this test. 3) Reduce the current to zero and allow the test switch to cool for 2 hr or until it reaches ambient temperature. 4) Repeat step 1. ANSI C12.9-2014 2014 National El

27、ectrical Manufacturers Association 9 g) A switch is considered to have successfully completed the above tests when no constant temperature reading in the testsper item f, steps 1 or 4has exceeded 30 C above ambient and the difference between corresponding readings taken in the tests per item f, step

28、s 1 and 4 does not exceed 7C. Figure 6 Performance Test Wiring Diagram 6 General Requirements for Test Plugs 6.1 Materials and workmanship The test plug shall be constructed with an insulated handle providing an anti-slip gripping area and a barrier to help prevent the users gloved hand from slippin

29、g into contact with the test switch. ANSI C12.9-2014 10 2014 National Electrical Manufacturers Association Figure 7 Typical Test Plug NOTES (1) When the insertion guide takes the form of Section B-B Alternate #1, then for a switch with a slot width Wmin, the switch jaws shall not be separated by mor

30、e than Ymax = 0.188” when inserted. (2) If a positive stop is provided on the probe blade to limit insertion depth of the probe to M by bottoming out against S of the switch, then L may exceed Lmax provided M Dmin Smax = 0.030”. Dimension M is understood to be the distance at which further insertion

31、 into the test switch is guaranteed to be limited by a positive stop against S. Table 3 Test Plug Dimensions Test Plug Dimensions Dimension Minimum Preferred Maximum L 1.100 1.200 1.260 M 0.0 0.140 0.175 R 0.090 0.110 0.120 R1 n/a n/a 0.156 T 0.100 0.130 0.156 G 0.040 0.125 0.175 ALERT TO USERS: Pri

32、or to adoption of this standard, there are known instances of probes and switches where interferences exist that may not allow all probes and switches to mate or that may lead to probes shorting to undesired conductors. NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITwww.gLObAL.IhS.cOM OR cALL 1-800-854-7179/1-303-397-79565612_0514TB