1、 ANSI C12.7-2005 American National Standard Requirements for Watthour Meter Sockets 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 Manufact
2、urers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.7- 2005 Revision of ANSI C12.7-1993 American National Standard Requirements for Watthour Meter Sockets Secretariat: National Electrical Manufacturers A
3、ssociation 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 C12.7-2005 NOTICE AND DISCLAIMER The i
4、nformation 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 development
5、of this document. NEMA standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic cover
6、ed by this publication. While NEMA administers the process and establishes rules to promote fairness in the development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgmen
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9、A does not undertake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or e
10、ntity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given c
11、ircumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance
12、 with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is so
13、lely 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 C12.7-2005 i AMERICAN NATIONAL STANDARD Approval o
14、f 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 agreement has be
15、en 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. The use of American Nati
16、onal Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Insti
17、tute 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 Institute. Requests
18、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 action be tak
19、en 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 North 17th Stree
20、t, 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 International and Pa
21、n 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 Association Provide
22、d by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.7-2005 ii This page intentionally left blank Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or net
23、working permitted without license from IHS-,-,-ANSI C12.7-2005 iii Contents Page Foreword . vii 1 Scope .1 2 References.1 3 Definitions .1 3.1 Circuit bypass means (bypass).1 3.2 Continuous-duty current rating1 3.3 Continuous load 1 3.4 Meter socket (socket)1 3.5 Meter support 1 3.6 Ringless-type me
24、ter socket.1 3.7 Ring-type meter socket .1 3.8 Socket cover1 3.9 Socket rim .1 3.10 Socket sealing ring1 4 Electrical ratings.1 4.1 Current ratings 2 4.2 Voltage ratings 2 5 Performance requirements.2 6 Construction requirements.2 6.1 Construction and workmanship.2 6.2 Marking2 6.3 Enclosures.2 6.3.
25、1 Protection2 6.3.2 Construction3 6.3.3 Enclosure materials 3 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.7-2005 iv 6.3.4 Mounting bosses.3 6.3.5 Wiring spac
26、e.3 6.4 Conduit connections and knockouts .3 6.5 Limiting dimensions and relative locations of functional parts4 6.6 Terminal connectors5 6.7 Circuit closing means (bypass) .5 6.7.1 Horn bypass5 6.8 Sealing 5 6.9 Sectional and multiple-opening trough-type sockets 6 6.9.1 Structural types.6 6.9.2 Cov
27、ers 6 6.9.3 Meter position spacings6 6.10 Socket sealing.6 6.10.1 General .6 6.10.2 Dimensions and tolerances 6 6.10.3 Facilities for sealing 6 6.11 Watthour meter/ringless socket interference 6 6.12 Metric conversion 7 6.13 Safety alert markings 7 Tables 1 Knockout and bushing dimensions 4 Figures
28、1 Limiting dimensions of socket rim 8 2 Limiting dimensions and positions of socket jaws .9 3 Location of socket jaws (front view) .10 4 Socket-jaw position identification .11 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction
29、 or networking permitted without license from IHS-,-,-ANSI C12.7-2005 v 5 Internal voltage connections of 13-, 14-, and 15-jaw sockets12 6 Socket-sealing-ring dimensions .13 7 Hole dimensions to accommodate sealing means 14 8 Provisions for interchangeable gasketless hubs15 9 Horn bypass .16 A1 Enve
30、lope of surfaces that project into socket for 4- to 6-terminal meters18 A2 Envelope of surfaces that project into socket for 5-terminal meters in 7-terminal sockets 19 A3 Envelope of surfaces that project into socket for 7- to 8-terminal meters20 A4 Envelope of surfaces that project into socket for
31、8-terminal and 13- to 15-terminal meters .21 A5 Mounting and terminal dimensions for detachable single-element and multi-element watthour meters with 4 to 8 terminals .22 A6 Mounting and terminal dimensions for detachable multi-stator watthour meters with 8 terminals and 13 to 15 terminals .23 A7 En
32、velope of round covers for detachable single element and multi-element watthour meters 24 Annex A Limiting dimensions and tolerances of watthour meters17 Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitt
33、ed without license from IHS-,-,-ANSI C12.7-2005 vi Foreword (This Foreword is not part of American National Standard C12.7-2005.) This standard was developed by subcommittee 15 and balloted by the Accredited Standards Committee on Electricity Metering, C12, for full consensus approval as an American
34、 National Standard. This revised version supersedes ANSI C12.7-1987. Certain performance requirements covered by the latest revision of Underwriters Laboratories Standard for Safety on Meter Sockets have been adopted and referred to in this standard. Information on subsequent revisions of these prov
35、isions can be obtained through the Underwriters Laboratories Subscription Revision Service.*This standard covers the dimensions and functions of meter test switches for transformer-rated watthour meters when used in conjunction with instrument transformers. Suggestions for improvements of this stand
36、ard 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 Association 1300 North 17th Stre
37、et 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 Association C. Gomez Edison Electric
38、al 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 SWeiklNational Institute of Stan
39、dards and Technology T. Nelson NARUC J. Ruehl Underwriters Laboratory R. Breschini *Available from Underwriters Laboratories, Inc. 333 Pfingsten Road, Northbrook, IL 60062-2096, USA. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo repro
40、duction or networking permitted without license from IHS-,-,-ANSI C12.7-2005 vii Independent Members: B. Hughes A. Moise ASnydrAt the time this standard was completed, Subcommittee 15 of ANSI Committee C12, which developed and revised this standard, had the following membership: Francis Marta, Chair
41、man Carin Bernstiel, Secretary Organization Represented: Name of Representative: Florida Power & Light Company J. McEvoy Florida Power & Light Company J. DeMars GE Consumer & Industrial C. Crittenden Houston Lighting and Power J. Darnell Meter Devices Company J. Gagnon Milbank Manufacturing S. Glasg
42、ow NIST T. Nelson Oncor G. Hendley Pacific Gas & Electric D. Y. Nguyen Pacificorp L. Pananen Public Service Electric & Gas D. Ellis Austin Energy H. Millican Center for Neighborhood Technology L. Kotewa Central Hudson Gas & Electric R. Lokys Cooper B-Line F. Marta Duke Energy W. Ray Malemezian Consu
43、lting E. Malemezian 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 wit
44、h NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ANSI C12.7-2005 viii This page intentionally left blankCopyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without
45、 license from IHS-,-,-1 Requirements for Watthour Meter Sockets 1 Scope This standard covers the general requirements and pertinent dimensions applicable to watthour meter sockets rated up to and including 600 V and up to and including 320 A continuous duty per socket opening. 2 References This stan
46、dard shall be used in conjunction with the following standards. When the following standards are superseded by an approved revision, the revision shall apply. ANSI C12.10-2004, American National Standard for Electromechanical Watthour Meters. ANSI Z535.4-2002, Product Safety Signs and Labels. ANSI/U
47、L 50-1995, Enclosure for Electrical Equipment. ANSI/UL 414-1999, Safety Standard for Meter Sockets. NEMA 250-2003, Enclosures for Electrical Equipment (1000 V Maximum). 3 Definitions 3.1 circuit bypass means (bypass): An assembly of parts which, when properly operated, closes the circuit between the
48、 line and load jaws. 3.2 continuous-duty current rating: The rating in amperes that a meter socket will carry continuously under stated conditions, without exceeding the allowable temperature rise. A multiposition trough socket has an additional current rating that denotes the maximum ampere capacity of the line buses. 3.3 continuous load: A load where the current continues for 3 hr or more. 3.4 meter socket (socket): An enclosure that has matching jaws to accommodate the bayonet-type (blade) terminals of a detachable watthour meter and has a means of
