NEMA ICS 10 PART 1-2005 Industrial Control and Systems Part 1 Electromechanical AC Transfer Switch Equipment (Errata 2006).pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 10-2005 PART 1Industrial Control and Systems Part 1: Electromechanical AC Transfer Switch Equipment Copyright 2006 by the National Electrical Manufacturers Association. To: Current Holders of ICS 10-2005, Part 1 From: NE

2、MA Communications Department Date: November 30, 2006 Re: Errata for ICS 10-2005, Part 1 The present publication of NEMA ICS 10-2005, Industrial Control and Systems, Part 1: Electromechanical AC Transfer Switch Equipment, has the following errata: Page 3, Clause 4, CHARACTERISTICS AND RATINGS Insert

3、the following sentence: “Transfer switch equipment is marked with electrical ratings and shall be applied in accordance with those ratings.” Please mark the change in your copy of the standard or insert the attached corrected page 3. Thank you for your assistance in this matter. We apologize for any

4、 inconvenience this causes. 2006 Errata to NEMA Standards Publication ICS 10-2005 Industrial Control and Systems Part 1: Electromechanical AC Transfer Switch Equipment Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209-3806 www.nema

5、.org Copyright 2006 by the 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, and the International and Pan American Copyright

6、 Conventions. Copyright 2006 by the 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 it was developed. Consensus do

7、es not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a volunt

8、ary consensus standards 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 and establishes rules to promote fairness in the development of consensus, it d

9、oes 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 judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of

10、any nature whatsoever, whether special, indirect, 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, express or implied, as to the accuracy or completeness of any

11、information published herein, and disclaims 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 standar

12、d 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 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

13、 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 circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user

14、 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 with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purp

15、oses. Any certification or other statement 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. ICS 10-2005, Part 1 AC Transfer Switch Equipment Page 3 Copyright 2005

16、 by the National Electrical Manufacturers Association. c. “Transfer Signal” is a term used to describe the signal that is initiated by the monitored source deviation and that signals the transfer switch to operate. operating transfer time: The time measured from the instant of the monitored source d

17、eviation to the closing of main contacts on an available alternate power source exclusive of any purposely introduced time delay. total system transfer time: The time measured from the instant of the monitored source deviation in one power source to the closing of main contacts on another power sour

18、ce, including any purposely introduced time delays and engine-generator start-up time. “Total System Transfer Time” is a parameter of the total system and not solely of the automatic transfer switch. 3 CLASSIFICATIONS Transfer switches are classified Type A or Type B as follows: Type A (PC*): A tran

19、sfer switch that is not intended to provide required overcurrent (overload and short-circuit) protection. Type B (CB*): A transfer switch that is intended to automatically provide required overcurrent (overload and short-circuit) protection. *International Electrotechnical Commission (IEC) 4 CHARACT

20、ERISTICS AND RATINGS Transfer switch equipment is marked with electrical ratings and shall be applied in accordance with those ratings. 4.1 Rated and Limiting Values for the Main (Power) Circuit 4.1.1 System Voltage Ratings The system voltage rating of transfer switch equipment shall be 120, 208, 24

21、0, 480, or 600 VAC, single phase or polyphase. 4.1.2 Continuous Current Rating The continuous current rating of transfer switch equipment shall be in the range of 30 to 4000 amps, based on an ambient temperature of 40C. 4.1.3 Rating Based on Load Characteristics Transfer switch equipment shall be ra

22、ted for one or more of the following types of loads: a. Total system load consisting of any combination of motors, electric discharge lamps, electric heating (resistive) loads, and tungsten lamp loads, provided the latter does not exceed 30 percent of the continuous current rating of the transfer sw

23、itch equipment b. Tungsten lamp load consisting entirely of tungsten lamps c. Electric discharge lamp load consisting entirely of electric discharge lamps, including fluorescent lamps d. Resistive load consisting of heater and other noninductive loads in which the inrush current does not exceed 150

24、percent of the continuous current rating of the switch 4.1.4. Interrupting Rating Current interrupting ratings shall be expressed in rms symmetrical amperes. NEMA Standards Publication ICS 10-2005 Industrial Control and Systems Part 1: Electromechanical AC Transfer Switch Equipment Published by: Nat

25、ional Electrical Manufacturers Association 1300 North 17th Street Rosslyn, Virginia 22209 www.nema.org Copyright 2005 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention f

26、or the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. 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 i

27、t was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, a

28、re 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 covered by this publication. While NEMA administers the process and establishes rules to promote fairness in the d

29、evelopment 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 judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, p

30、roperty, or other damages of any nature whatsoever, whether special, indirect, 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, express or implied, as to the acc

31、uracy or completeness of any information published herein, and disclaims 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 servi

32、ces 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 entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using

33、 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 circumstances. Information and other standards on the topic covered by this publication may be available from

34、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 with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installati

35、ons 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 solely the responsibility of the certifier or maker of the statement. ICS 10-2005, Part 1 AC Transfer Switch Eq

36、uipment Page i Copyright 2005 by the National Electrical Manufacturers Association. CONTENTS Page Part 1 AC TRANSFER SWITCH EQUIPMENT.1 1 GENERAL1 1.1 Referenced Standards.1 1.2 Scope .2 2 DEFINITIONS 2 2.1 Switching Devices.2 2.2 Operation of AC Transfer Switch Equipment 2 3 CLASSIFICATIONS3 4 CHAR

37、ACTERISTICS AND RATINGS3 4.1 Rated and Limiting Values for the Main (Power) Circuit3 4.1.1 System Voltage Ratings.3 4.1.2 Continuous Current Rating 3 4.1.3 Rating Based on Load Characteristics .3 4.1.4 Interrupting Rating.3 4.1.5 Motor Starter Rating 4 4.1.6 Withstand and Closing Ratings 4 4.1.7 Ove

38、rcurrent Protection 4 5 PRODUCT MARKING, INSTALLATION, AND MAINTENANCE INFORMATION5 5.1 Markings.5 5.1.1 Transfer Switches5 5.1.2 Bypass Isolation Switch Equipment5 5.1.3 Control Circuits .5 5.1.4 Maintenance of Transfer Switch Equipment .5 6 SERVICE AND STORAGE CONDITIONS .5 7 CONSTRUCTION.6 7.1 Sp

39、acings.6 7.2 Test Switch .6 7.3 Interlock6 7.3.1 Protection from Cross-Connection .6 7.3.2 Bypass Isolation Switch Interlock.6 7.4 Service Equipment 6 7.5 Fire Pump Circuit Service7 7.6 Emergency Power Circuit Service7 7.7 Control Circuits .7 8 PERFORMANCE REQUIREMENTS AND TESTS9 8.1 Performance Req

40、uirements .9 8.1.1 Control Circuits .9 8.1.2 Ground-Fault Protection 9 8.1.3 Undervoltage Monitoring Characteristics9 8.2 Design Tests.9 ICS 10-2005, Part 1 AC Transfer Switch Equipment Page ii Copyright 2005 by the National Electrical Manufacturers Association. 8.2.1 General .9 8.2.2 Test Sequence

41、9 8.2.3 Test Samples . 10 9 APPLICATIONS . 11 9.1 Motor Transfer 11 9.2 AC Transfer Switch Equipment Specification . 11 9.3 Features for Particular Applications. 11 Annex A Short Time Rating 14 Annex B Neutral Conductors in Power Transfer Systems 16 ICS 10-2005, Part 1 AC Transfer Switch Equipment P

42、age iii Copyright 2005 by the National Electrical Manufacturers Association. Foreword This Standards Publication was prepared by a technical committee of the NEMA Industrial Automation Control Products and Systems Section. It was approved in accordance with the bylaws of NEMA and supersedes the indi

43、cated NEMA Standards Publication. This Standards Publication supersedes ICS 10-1993. Information on static transfer switches can be found in ICS 10-1999 Part 2: Static AC Transfer Switch Equipment. This Standards Publication provides practical information concerning ratings, construction, test, perf

44、ormance and manufacture of industrial control equipment. These standards are used by the electrical industry to provide guidelines for the manufacture and proper application of reliable products and equipment and to promote the benefits of repetitive manufacturing and widespread product availability

45、. NEMA Standards represent the result of many years of research, investigation and experience by the members of NEMA, its predecessors, its Sections and Committees. They have been developed through continuing consultation among manufacturers, users and national engineering societies and have resulte

46、d in improved serviceability of electrical products with economies to manufacturers and users. One of the primary purposes of this Standards Publication is to encourage the production of reliable control equipment which, in itself, functions in accordance with these accepted standards. Some portions

47、 of these standards, such as electrical spacings and interrupting ratings, have a direct bearing on safety; almost all of the items in this publication, when applied properly, contribute to safety in one way or another. Properly constructed industrial control equipment is, however, only one factor i

48、n minimizing the hazards which may be associated with the use of electricity. The reduction of hazard involves the joint efforts of the various equipment manufacturers, the system designer, the installer and the user. Information is provided herein to assist users and others in the proper selection

49、of control equipment. The industrial control manufacturer has limited or no control over the following factors which are vital to a safe installation: a. Environmental conditions b. System design c. Equipment selection and application d. Installation e. Operating practices f. Maintenance This publication is not intended to instruct the user of control equipment with regard to these factors except insofar as suitable equipment to meet needs can be recognized in this publication and some application guidance is given. This Standards Publication is necessarily confined to