1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 18-2001 (R2007)Motor Control CentersNEMA Standards Publication ICS 18-2001 (R2007) Motor Control Centers Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 222
2、09 www.nema.org Copyright 2007 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 America
3、n 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 it was developed. Consensus does not necessarily mean that there is unanimous agreement
4、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 voluntary consensus standards development process. This process
5、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 does not write the document and it does not independently t
6、est, 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, indirect, conseque
7、ntial, 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 disclaims and makes no
8、 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 document avail
9、able, 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, as appropriate,
10、 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 or information
11、 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 of compliance
12、 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 18-2001 (R2007) Page i Copyright 2007 by the National Electrical Manufacturers Association. CONTENTS Foreword iii 1 GENERA
13、L1 1.1 Referenced Standards.1 1.2 Scope .2 1.3 Normative References.2 1.4 Equipment 2 2 DEFINITIONS 2 3 CLASSIFICATIONS3 3.1 Classes and Types3 3.2 Classes of Motor Control Centers3 3.2.1 Class I-Independent Units3 3.2.2 Class II-Interconnected Units.4 3.2.3 Class I-S almost all of the items in this
14、 publication, when applied properly, contribute to safety in one way or another. Properly constructed industrial control equipment is, however, only one factor in minimizing the hazards which may be associated with the use of electricity. The reduction of hazard involves the joint efforts of the var
15、ious equipment manufacturers, the system designer, the installer and the user. Information is provided herein to assist users and others in the proper selection of control equipment. The industrial control manufacturer has limited or no control over the following factors which are vital to a safe in
16、stallation: 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 n
17、eeds can be recognized in this publication and some application guidance is given. ICS 18-2001 (R2007) Page iv Copyright 2007 by the National Electrical Manufacturers Association. This Standards Publication is necessarily confined to defining the construction requirements for industrial control equi
18、pment and to providing recommendations for proper selection for use under normal or certain specific conditions. Since any piece of industrial control equipment can be installed, operated and maintained in such a manner that hazardous conditions may result, conformance with this publication does not
19、 by itself assure a safe installation. When, however, equipment conforming with these standards is properly selected and is installed in accordance with the National Electrical Code and properly maintained, the hazards to persons and property will be reduced. To continue to serve the best interests
20、of users of Industrial Control and Systems equipment, the Industrial Control and Systems Section is actively cooperating with other standardization organizations in the development of simple and more universal metrology practices. In this publication, the U.S. customary units are gradually being sup
21、plemented by those of the modernized metric system known as the International Systems of Units (SI). This transition involves no changes in standard dimensions, tolerances, or performance specifications. NEMA Standards Publications are subject to periodic review. They are revised frequently to refle
22、ct user input and to meet changing conditions and technical progress. Proposed revisions to this Standards Publication should be submitted to: Vice President, Engineering Department National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 This standard
23、s publication was developed by the Industrial Automation Control Products and Systems Section. Section Approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time it was approved, the Section was composed of the
24、following members: ABB Control, Inc.Wichita Falls, TX Alstom Power ConversionPittsburgh, PA Automatic Switch CompanyFlorham Park, NJ Balluff, Inc.Florence, KY Carlo Gavazzi, Inc.Buffalo Grove, IL CMC Torque ConvertersBillerica, MA Control Concepts CorpBeaver, PA Cooper BussmanSt. Louis, MO Cummins,
25、Inc.Minneapolis, MN Cyberex LLCRichmond, VA Eaton CorporationMilwaukee, WI Electro Switch CorporationWeymouth, MA Emerson Process ManagementAustin, TX Entrelec, Inc.Irving, TX GE Industrial SystemsPlainville, CT Hubbell IncorporatedMadison, OH Joslyn Clark Controls, Inc.Lancaster, SC Lexington Switc
26、h & ControlsMadison, OH ICS 18-2001 (R2007) Page v Copyright 2007 by the National Electrical Manufacturers Association. Lincoln ElectricCleveland, OH Master Controls Systems, Inc.Lake Bluff, IL Metron, Inc.Denver, CO Mitsubishi Electric Automation, Inc.Vernon Hills, IL Moeller Electric CorporationFr
27、anklin, MA Omron Electronics LLC.Schaumburg, IL Peerless-Winsmith, Inc.Warren, OH Pepperl & Fuchs, Inc.Twinsburg, OH Phoenix Contact, Inc.Harrisburg, PA Pittman, Division of Penn Engineering and Mfg. Corp.Harleysvile, PA Post Glover Resistors, Inc.Erlanger, KY R. Stahl, Inc.Woburn, MA Reliance Contr
28、ols Corp.Racine, WI Robert Bosch Corp.Avon, CT Rockwell AutomationMilwaukee, WI Russelectric, Inc.Hinngham, MA Schneider Automation, Inc.North Andover, MA SEW-Eurodrive, Inc.Lyman, SC Siemens Corporate ResearchPrinceton, NJ Siemens Energy & Automation, Inc.Duluth, GA Square D CompanyRaleigh, NC Texa
29、s Instruments, Inc.Attleboro, MA Torna Tech, Inc.St. Laurent, QC, Canada Toshiba International CorporationHouston, TX Total Control Products, Inc.Addison TX Tyco Electronics/AMPHarrisburg, PA WAGO Corp.Germantown, WI Weidermuller, Inc.Richmond, VA Yaskawa Electric America, Inc.Waukegan, IL ICS 18-20
30、01 (R2007) Page vi Copyright 2007 by the National Electrical Manufacturers Association. ICS 18-2001 (R2007) Page 1 Copyright 2007 by the National Electrical Manufacturers Association. Motor Control Centers 1 GENERAL 1.1 Referenced Standards In this NEMA Standards Publication reference is made to the
31、 standards listed below. Copies are available from the indicated sources. National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847 Rosslyn, Virginia 22209 ICS 1-2000 Industrial Control and Systems General Requirements ICS 1.3-1986 (2001) Preventive Maintenance of Industrial C
32、ontrol and Systems Equipment ICS 2-2000 Industrial Control & Systems: Controllers, Contactors and Overload Relays ICS 2.3-1995 Industrial Control & Systems: Controllers, Instructions for the Handling Installation, Operation, and Maintenance of Motor Control Centers ICS 6-1993 (R2001) Industrial Cont
33、rol and Systems: Enclosures NEMA 250-1997 Enclosures for Electrical Equipment (1000 volts maximum) Underwriters Laboratories 333 Pfingsten Road Northbrook, IL 60062 UL 845 (1998) Motor Control Centers American National Standards Institute 11 West 42nd Street New York, NY 10036 ANSI C62.2-1987 Guide
34、for Application of Gapped, Silicon-Carbide Lightning Arresters for Alternating Current Systems Institute of Electrical and Electronics Engineers 345 East 47thStreet New York. NY 10017 IEEE C37.09-1999 Test Procedure For AC High-voltage Circuit Breaker Rated on a Symmetrical Current Basis IEEE C37.26
35、-1972 Methods of Power-Factor Measurements for Low-Voltage Inductive Test Circuits IEEE 141-1993 Recommended Practice for Electric Power Distribution for Industrial Plants IEEE 4-1995 Techniques for High-Voltage Testing IEEE 100-2000 Standard Dictionary of Electrical and Electronic Terms ICS 18-2001
36、 (R2007) Page 2 Copyright 2007 by the National Electrical Manufacturers Association. 1.2 Scope The standards in this part apply to three phase 50 and 60 hertz motor control centers rated not more than 600 volts AC. 1.3 Normative References The definitions and standards of NEMA Standards Publication
37、No. 250, ICS 1, ICS 6, and portions of ICS 2 also apply to this part. 1.4 Equipment A motor control center may contain any combination of equipment such as the following: a) Full-voltage reversing or non-reversing combination motor-control units b) Full-voltage multispeed combination motor-control u
38、nits c) Reduced-voltage part-winding, wye-delta or auto-transformer combination motor-control units d) Solid-state industrial controllers such as adjustable-speed drives, programmable controllers, protective relays, etc. e) Lighting or distribution panelboards f) Feeder-tap units g) Incoming-line eq
39、uipment, such as main lugs, fusible switch, isolation switch, or air circuit breaker h) Control or lighting transformers i) Special equipment assemblies The foregoing equipment may contain such items as pushbuttons, selector switches, indicating lights, control transformers, control circuit fuses, a
40、nd auxiliary contacts incorporated as an integral part of the above units. 2 DEFINITIONS For the purposes of this part, the following definitions apply: blank unit space: Unit space not equipped to accept a future unit. combination motor-control unit: A control unit that includes an externally opera
41、ble circuit disconnecting means, motor branch-circuit overcurrent protection and a motor controller with associated auxiliary devices when used. The disconnecting means and motor branch-circuit overcurrent protection consist of a fusible disconnecting device or circuit breaker. If the latter is used
42、, it is either an inverse time (thermal-magnetic or dual magnetic) or an instantaneous magnetic-trip-only circuit breaker. The motor controller includes motor overload protection unless equivalent protection is otherwise provided. ICS 18-2001 (R2007) Page 3 Copyright 2007 by the National Electrical
43、Manufacturers Association. Two sets of externally operable circuit disconnecting means, each with branch-circuit overcurrent protection and magnetic motor controller, may be mounted in a single compartment to form a dual unit. custom drawings (motor control centers): Manufacturers drawings made to m
44、eet user custom requirements. feeder-tap unit: A unit that includes an externally operable circuit disconnecting means and branch-circuit overcurrent protection, principally used for nonmotor loads. Two sets of externally operable circuit means, each with branch-circuit overcurrent protection, may b
45、e mounted in a single compartment to form a dual unit. future unit space: Unit space specified and equipped to accept a future unit. motor control center: A floor-mounted assembly of one or more enclosed vertical sections typically having a horizontal common power bus and principally containing comb
46、ination motor-control units. These units are mounted one above the other in the vertical sections. The sections normally incorporate vertical buses connected to the common power bus, thus extending the common power supply to the individual units. Power may be supplied to the individual units by bus
47、bar connections, by stab connection, or by suitable wiring. standard drawings (motor control centers): Arrangement drawings and wiring diagrams prepared. using manufacturers standard drawing sizes, device symbols, and identification and numbering designation. unusable unit space: Unit space not suit
48、able to accept a future unit. 3 CLASSIFICATIONS 3.1 Classes and Types Motor control centers are provided as either Class I or Class II assemblies. Each class may be supplied with standard or custom drawings. Motor control centers are factory wired as either Type A, B, or C. 3.2 Classes of Motor Cont
49、rol Centers Motor control centers shall be provided as either Class I or Class II assemblies. With either class the user may specify the physical arrangement of units within the motor control center subject to the design parameters of the manufacturer. Equipment described in 3.2.1 and 3.2.2 shall be supplied with the manufacturers standard drawings and shall be designated as Class I or Class II, as selected by the user. Equipment described in paragraph 3.2.3 shall be supplied with the manufacturers custom drawings and shal
