NEMA C12 7-2014 Requirements for Watthour Meter Sockets.pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C12.7-2014Requirements for Watthour Meter SocketsANSI C12.7-2014 Revision of ANSI C12.7-2005 American National Standard for Requirements for Watthour Meter Sockets Secretariat: National Electrical Manufacturers Association A

2、pproved August 14, 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 of the document at the time

3、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 voluntary consensus standard

4、s development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process to promote fairness in the development of consensus, it does not write the document and it does not i

5、ndependently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indi

6、rect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaim

7、s and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA 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

8、document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, 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, a

9、s appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. 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

10、or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance 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

11、 of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. ANSI C12.7-2014 2014 National Electrical Manufacturers Association i AMERICAN NATIONAL STANDARD Approval of an A

12、merican 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 been rea

13、ched 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 National S

14、tandards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute do

15、es 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 for int

16、erpretations 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 taken to r

17、eaffirm, 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 National Electrical Manufacturers As

18、sociation 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 Literary and Artistic Works,

19、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 C12.7-2014 ii 2014 National Ele

20、ctrical Manufacturers Association Foreword (This foreword is not part of American National Standard C12.7-2014.) 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 National Standar

21、d. This revised version supersedes ANSI C12.7-2005. 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 provisions can be obt

22、ained 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 standard are welcome.

23、 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, Suite 900 Rosslyn

24、, VA 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: Alabama Power Co. Derl Rhoades Ameren Services James West Baltimore Gas and Elect

25、ric Co. Jim Thurber Center for Neighborhood Technology Lawrence Kotewa Central Hudson Gas & Electric Brett Arteta Consumers Energy David Jirikovic DTE Energy Kostas Tolios Duke Energy Tim Morgan Elster Solutions Scott Weikel EnerNex Corporation Aaron Snyder Florida Power & Light Co . Jim DeMars Futu

26、re DOS R&D Inc. Avygdor Moise *Available from Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096, USA ANSI C12.7-2014 2014 National Electrical Manufacturers Association iii GE Energy Curt Crittenden Itron, Inc. Brent Cain JECARRCO, LLC Jack, Carr Landis+Gyr John Voisine ME

27、T Laboratories, Inc. Jim Reed Millbank Manufacturing Co. Shawn Glasgow NIST Tom Nelson Oncor Brad Johnson Pacific Gas and Electric Co. D. Young Nguyen Power Measurements William Hardy Public Service Electric & Gas David Ellis Radian Research, Inc. Shannon Edwards SAIC David Scott Schweitzer Engineer

28、ing Labs Travis Mooney Sensus Metering Kenny ODell Silver Spring Networks Kam Oza Technology for Energy Corporation Steve Hudson TESCO Tom Lawton Trilliant Networks Michel Veillette Tucker Engineering Richard Tucker Underwriters Laboratories Scott Hunter Watthour Engineering Lea Wren Xcel Energy Dan

29、 Nordell ANSI C12.7-2014 iv 2014 National Electrical Manufacturers Association At the time this standard was completed, Subcommittee 15 of ANSI Committee C12, which developed and revised this standard, had the following membership: Shawn Glasgow, Chairman Paul Orr, Secretary Organization Represented

30、: Name of Representative: Central Hudson Gas & Electric B. Arteta DTE Energy K. Tolios Duke Energy R. Wesley Elevate Energy L. Kotewa Elster Solutions S. Weikel EnerNex Corporation A. Snyder Florida Power & Light Co. J. DeMars GE Energy C. Crittenden ITI B. Sonnenberg Landis+Gyr J. Voisine Milbank M

31、anufacturing Co. S. Glasgow NIST T. Nelson Oncor B. Johnson Pacific Gas & Electric Co. D. Young Nguyen Power Measurements W. Hardy Public Service Electric & Gas D. Ellis Siemens Industry, Inc. W. Rose Technology for Energy Corporation S. Hudson The Durham Company M. Shoemaker ANSI C12.7-2014 2014 Na

32、tional Electrical Manufacturers Association v TABLE OF CONTENTS Foreword . ii 1 Scope 1 2 References 1 3 Definitions 1 3.1 circuit bypass means (bypass) . 1 3.2 continuous-duty current rating 1 3.3 continuous load . 1 3.4 meter socket (socket): 1 3.5 meter support 1 3.6 ringless-type meter socket 1

33、3.7 ring-type meter socket 1 3.8 socket cover 1 3.9 socket rim . 1 3.10 socket sealing ring 1 4 Electrical Ratings . 2 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 Marking . 2 6.3 Enclosures 2 6.3.1 Pr

34、otection 2 6.3.2 Construction 3 6.3.3 Enclosure materials . 3 6.3.4 Mounting bosses . 3 6.3.5 Wiring space 3 6.4 Conduit connections and knockouts . 3 6.5 Limiting dimensions and relative locations of functional parts . 5 6.6 Terminal connectors . 5 6.7 Circuit closing means (bypass) . 6 6.7.1 Horn

35、bypass . 6 6.8 Sealing 6 6.9 Sectional and multiple-opening trough-type sockets 6 6.9.1 Structural types 6 6.9.2 Covers . 6 6.9.3 Meter position spacings . 6 ANSI C12.7-2014 vi 2014 National Electrical Manufacturers Association 6.10 Socket sealing . 6 6.10.1 General 6 6.10.2 Dimensions and tolerance

36、s . 7 6.10.3 Facilities for sealing . 7 6.11 Watthour meter/ringless socket interface . 7 6.12 Metric conversion 7 6.13 Safety alert markings 7 Tables Table 1 300 V Rating 2 Table 2 600 V Rating 2 Table 3 Knockout and Bushing Dimensions . 4 Table 4 Limiting Dimensions and Tolerances . 5 Figures Figu

37、re 1 Limiting Dimensions of Socket Rim 8 Figure 2 Limiting Dimensions and Positions of Socket Jaws 9 Figure 3 Location of Socket Jaws (Front View) 10 Figure 4 Socket-Jaw Position Identification 11 Figure 5 Internal Voltage Connections of 13-, 14-, and 15-Jaw Sockets 12 Figure 6 SocketSealing Ring Di

38、mensions 13 Figure 7 Hole Dimensions to Accommodate Sealing Means 14 Figure 8 Provisions for Interchangeable Gasketless Hubs . 15 Figure 9 Horn Bypass 16 ANSI C12.7-2014 2014 National Electrical Manufacturers Association 1 1 Scope This standard covers the general requirements and pertinent dimension

39、s 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 standard shall be used in conjunction with the following standards. When the following standards are superseded by an approved revision, the revi

40、sion shall apply. ANSI C12.10-2011, American National Standard for Electromechanical Watthour Meters ANSI Z535.4-2011, Product Safety Signs and Labels ANSI/UL 50-2012, Enclosure for Electrical Equipment ANSI/UL 414-2009, Safety Standard for Meter Sockets NEMA 250-2008, Enclosures for Electrical Equi

41、pment (1000 V Maximum) 3 Definitions 3.1 circuit bypass means (bypass): An assembly of parts which, when properly operated, closes the circuit between the line and load jaws. 3.2 continuous-duty current rating: The rating in amperes that a meter socket will carry continuously under stated conditions

42、 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 hours or more. 3.4 meter socket (socket): An enclosure that has

43、matching jaws to accommodate the bayonet-type (blade) terminals of a detachable watthour meter and has a means of connection for the termination of the circuit conductors. It may be a single-position socket for one meter or a multiposition trough socket for two or more meters. 3.5 meter support: Tha

44、t part of a ringless-type meter socket that positions and supports a detachable watthour meter. 3.6 ringless-type meter socket: A meter socket that has no provision for a socket sealing ring but has other means of holding a detachable watthour meter in place, such as a cover that is secured in place

45、 by a latch. 3.7 ring-type meter socket: A meter socket that has a socket rim. 3.8 socket cover: The removable portion of the enclosure that provides access to the meter socket wiring. 3.9 socket rim: That part of a ring-type meter socket that is required to accommodate the socket sealing ring that

46、holds a detachable watthour meter in place. The socket rim may be a part of the cover that is secured in place by a fastener such as a latch or crossbar. 3.10 socket sealing ring: A ring used to overlap the socket rim and the detachable watthour meter cover ring to hold and provide means for sealing

47、 a detachable watthour meter in place. ANSI C12.7-2014 2 2014 National Electrical Manufacturers Association 4 Electrical Ratings 4.1 Current ratings Continuous duty current ratings of sockets shall include 20, 80, 100, 120, 150, 160, 200, and 320 A. 4.2 Voltage ratings The voltage ratings shall be 3

48、00 V or 600 V. Meter sockets shall be so designed as to be applicable to one or more of the following nominal voltages: Table 1 300 V Rating 120/240 3-wire single phase 208Y/120 3-wire open Y 208Y/120 4-wire three-phase Y 240/120 4-wire three-phase 240 3-wire three-phase Table 2 600 V Rating 480 3-w

49、ire three-phase 480Y/277 4-wire three-phase Y 600 3-wire three-phase 5 Performance Requirements Performance requirements for meter sockets shall be in accordance with applicable performance sections of ANSI/UL 414. 6 Construction Requirements 6.1 Construction and workmanship The watthour meter socket and its components shall be constructed of materials suitable for the particular use. They shall be made and finished with a high degree

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