1、 ANSI C12.9-2005 American National Standard for Test Switches for Transformer-Rated Meters Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright National Electrical M
2、anufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 Revision of ANSI C12.9-1987 American National Standard For Test Switches for Transformer-Rated Meters Secretariat: National Electrical Ma
3、nufacturers Association Approved April 15, 2005 American National Standards Institute, Inc. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 NOTICE AND DIS
4、CLAIMER The information in this publication 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
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13、EMA and is solely the responsibility of the certifier or maker of the statement.Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 i AMERICAN NATIONAL STANDA
14、RD 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, substantial agr
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17、andards 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 Standards Institu
18、te. 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 Caution Notice: This American National Standard may be revised or withdrawn at any time.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 require that
19、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 Association 1300 Nor
20、th 17th Street, Rosslyn, VA 22209 Copyright 2005 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 Interna
21、tional 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. Copyright National Electrical Manufacturers Associ
22、ation Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 ii This page intentionally left blank.Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reprod
23、uction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 iii Contents Page Foreword v 1 Scope 1 2 Definitions.1 2.1 Short-circuiting switch.1 2.2 Test jack1 2.3 Test jack switch.1 2.4 Test plug .1 2.5 Voltage switch.1 3 Standard ratings.1 3.1 Current .1 3.2 Voltage .1 4 General re
24、quirements1 4.1 Material and workmanship1 4.2 Nameplates.1 4.3 Movable parts2 4.4 Number of poles2 4.5 Alternative switch arrangements.2 4.6 Provision for test plugs4 4.7 Insulating barriers .4 4.8 Wiring terminals and test clips 4 4.8.1 Wiring terminals .4 4.8.2 Test clips6 4.9 Mounting holes6 4.10
25、 Cover.6 4.10.1 General 6 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 iv 4.10.2 Cover holes7 4.10.3 Cover studs7 4.11 Acceptable spacings.7 4.11.1 Bar
26、riers.7 4.11.2 Dimensions 7 5 Performance .7 Tables 1 Minimum acceptable spacings.7 Figures 1 Alternative arrangements and dimensions for four-, seven-, and ten-pole switches.3 2 Alternative arrangements and dimensions for four-, seven-, and ten-pole switches.5 3 Alternative arrangements and dimensi
27、ons for four-pole switches, also applicable for seven- and ten-pole switches 6 4 Performance test wiring diagram .9 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C
28、12.9-2005 v Foreword (This Foreword is not part of American National Standard C12.9-2005.) This standard is a revision of American National Standard for Test Switches for Transformer-Rated Meters, ANSI C12.9-1987. This standard was developed by the Accredited Standards Committee on Electricity Meter
29、ing, C12, for full consensus approval as an American National Standard. This revised version supersedes ANSI C12.9-1987. This standard covers the dimensions and functions of meter test switches for transformer-rated watthour meters when used in conjunction with instrument transformers. Suggestions f
30、or improvements of this standard will be welcomed. 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 Ass
31、ociation 1300 North 17th Street Rosslyn, Virginia 22209 At the time this standard was completed, the American National Standards Committee C12 had the following membership: Tom Nelson, Chairman Carin Bernstiel, Secretary Organization Represented: Name of Representative: American Public Power Associa
32、tion C. Gomez Edison Electrical Institute L. Kotewa J. McEvoy ingT. Morgan D. YNguyen L. Pananen Institute of Electrical and Electronics Engineers H. Millican Measurement Canada (Liaison No Vote) V. Nguyen National Electrical Manufacturers Association M. Anderson E. Beroset C. Crittenden F. Mart SWe
33、iklNational Institute of Standards and Technology T. Nelson Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 vi NARUC J. Ruehl Underwriters Laboratories, I
34、nc. R. Breschini Independent Members: B. Hughes A. Moise SnydrAt the time this standard was completed, Subcommittee 15 of ANSI Committee C12, which developed and revised this standard, had the following membership: Francis Marta, Chairman Carin Bernstiel, Secretary Organization Represented: Name of
35、Representative: Florida Power and Light Company J. McEvoy Florida Power and Light Company J. DeMars GE Consumer and Industrial C. Crittenden Houston Lighting and Power J. Darnell Meter Devices Company J. Gagnon Milbank Manufacturing S. Glasgow National Institute of Standards and Technology T. Nelson
36、 Oncor G. Hendley Pacific Gas and Electric D. Y. Nguyen Pacificorp L. Pananen Public Service Electric and Gas D. Ellis Austin Energy H. Millican Center for Neighborhood Technology L. Kotewa Central Hudson Gas and Electric R. Lokys Cooper B-Line F. Marta Duke Energy W. Ray Malemezian Consulting E. Ma
37、lemezian Ekstrom M. Lewis leElectricty SWkelErcot D. Tandon Schlumberger Electricity A. Snyder Siemens Energy & Automation J. Young Siemens Energy & Automation W. Rose The Durham Company M. Shoemaker Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot f
38、or ResaleNo reproduction or networking permitted without license from IHS-,-,-1 For Test Switches for Transformer-Rated Meters 1 Scope This standard is intended to encompass the dimensions and functions of meter test switches used with transformer-rated watthour meters in conjunction with instrument
39、 transformers. 2 Definitions 2.1 short-circuiting switch: A single-pole double-throw (make-before-break) transfer switch used to transfer current away from the meter. 2.2 test jack: A spring-jaw receptacle in the current element of a test switch that provides a bipolar test connection in the meterin
40、g current circuit without interruption of the current circuit. 2.3 test jack switch: A single-pole single-throw disconnect switch used in conjunction with a test jack to provide a parallel current path during normal operating conditions. 2.4 test plug: A bipolar mating plug to a test jack for insert
41、ing instrumentation into the metering current circuit. 2.5 voltage switch: A single-pole single-throw switch used to open or close a voltage circuit. 3 Standard ratings 3.1 Current The current rating shall be 20 A minimum. 3.2 Voltage The voltage rating shall be 300 V or 600 V. 4 General requirement
42、s 4.1 Material and workmanship The test switch and its components shall be substantially constructed of suitable material in a workmanlike manner. 4.2 Nameplates Nameplates are not required on these test switches, but a manufacturers identifying marking (such as catalog number, trademark, etc.) shal
43、l be stamped, printed, affixed, or cast in a convenient place on each test switch. When required, a warning label indicating hidden internal jumpers should be affixed. AMERICAN NATIONAL STANDARD ANSI C12.9-2005Copyright National Electrical Manufacturers Association Provided by IHS under license with
44、 NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 2 4.3 Movable parts Movable conducting parts such as blade hinges shall be held in place by locknuts or pins or their equivalent, arranged so that a firm and secure connection will be maintained a
45、t any position of the switch blade. 4.4 Number of poles Standard test switches shall include the following forms: a) Four pole b) Seven pole c) Ten pole 4.5 Alternate switch arrangements Test switches may have various switch pole arrangements and spacings, some of which are shown in figures 1 throug
46、h 3. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 3 Figure 1 Alternative arrangements and dimensions for four-, seven-, and ten-pole switches Copyright
47、 National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.9-2005 4 4.6 Provision for test plugs Each double-pole short-circuiting current switch shall be designed to permit the ins
48、ertion of a test plug. The test-jack switch can be either in the left-hand or the right-hand position. 4.7 Insulating barriers Where needed, suitable insulating barriers shall be installed between the voltage switches and between potential switches as indicated in figures 1 through 3. Barriers may be an integral part of the base, a separate part fastened to the base, or an integral part of each individual switch section. 4.8 Wiring terminals and test clips 4.8.1 Wiring terminals Test switches shall be provided with suitable wiring t
