1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 6-1993 (R2011)Industrial Control and Systems: EnclosuresNEMA Standards Publication ICS 6-1993 (R2001, R2006, R2011) Industrial Control and Systems: Enclosures Published by National Electrical Manufacturers Association 13
2、00 North 17th Street, Suite 1752 Rosslyn, VA 22209 Copyright 2001 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, an
3、d 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 it was developed. Consensus does not necessarily mean
4、 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 voluntary consensus standards
5、 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 does not write the docum
6、ent 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 any nature whatsoever,
7、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, expressed or implied, as to the accuracy or completeness of any information published
8、 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 standard or guide. In publis
9、hing 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 his or her own indep
10、endent 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 may wish to consult
11、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 purposes. Any certificati
12、on 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 6-1993 (R2001, R2006, R2011) Page i Copyright 2001 by the National Electrical Manufactur
13、ers Association. CONTENTS Page Foreword ii Section 1 GENERAL 1.1 Referenced Standards 1 1.2 Scope .2 1.3 Normative Standards.2 1.4 General Requirements 2 Section 2 DEFINITIONS (See NEMA 250 for definitions applying to this standard.) Section 3 CLASSIFICATION 3.1 Standard Enclosure Types 2 3.2 Multip
14、le Type Designations .2 Section 4 CHARACTERISTICS AND RATINGS (This publication contains no ratings.) Section 5 PRODUCT MARKING, INSTALLATION, AND MAINTENANCE INFORMATION 5.1 Marking 2 5.2 Enclosure Grounding 2 5.3 Tapered Pipe Threads .3 5.4 Maintenance 3 Section 6 SERVICE AND STORAGE CONDITIONS (S
15、ee ICS 1, Part 6 for storage conditions.) Section 7 CONSTRUCTION (See NEMA 250 for construction.) 7.1 Strength of Enclosures 3 7.1.1 Sheet Metal Enclosures .3 7.1.2 Cast Metal Enclosures .3 7.1.3 Securing Means .3 7.2 Ventilating Openings 6 7.2.1 General .6 7.2.2 Perforated or Expanded Sheet Metal 6
16、 7.2.3 Screen Enclosures .6 7.2.4 Minimum Screen Wire Size 6 7.3 Wire Entrances 6 7.3.1 Knockouts 6 7.3.2 Knockout Diameters and Conduit Bushing Dimensions 7 7.3.3 Threaded Conduit Hubs 7 7.3.4 Threaded Holes for Rigid Conduit 9 7.4 Electrical Spacings .13 7.5 Wire-Bending Space 13 7.6 Provisions fo
17、r Grounding 13 7.7 Legends 13 Section 8 PERFORMANCE REQUIREMENTS AND TESTS 8.1 General .13 8.2 Nonmetallic Enclosures .13 8.3 Type 5 and Type 12 Enclosures with Ventilated Compartment 13 Section 9 APPLICATION (See NEMA 250 for application information.) ICS 6-1993 (R2001, R2006, R2011) Page ii Copyri
18、ght 2001 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 indicated NEMA Sta
19、ndards Publication. This standards publication supersedes ICS 6-1993 (R2001). This standards publication provides practical information concerning ratings, construction, test, performance and manufacture of industrial control equipment. These standards are used by th e electrical industry to provide
20、 guidelines for the manufacture and proper application of reliable products and equipment and to promote the benefits of repetitive manufacturing and widespread product availability. NEMA standards represent the result of many years of research, investigation, and experience by the members of NEMA,
21、its predecessors, its sections and committees. They have been developed through continuing consultation among manufacturers, users and national engineering societies and have resulted in improved serviceability of electrical products with economies to manufacturers and users. One of the primary purp
22、oses 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 of these standards, such as electrical spacings and interrupting ratings, have a direct bearing on safety; almost all
23、 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 in minimizing the hazards, which may be associated with the use of electricity. The reduction of hazard involves the jo
24、int 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 of control equipment. The industrial control manufacturer has limited or no control over the following factors, which
25、 a re 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 suit
26、able equipment to meet needs can be recognized in this publication and some application guidance is given. This standards publication is necessarily confined to defining the construction requirements for industrial control equipment and to providing recommendations for proper selection for use under
27、 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 by itself assure a safe installation. When, however, equipment conformin
28、g with these standards is properly selected ICS 6-1993 (R2001, R2006, R2011) Page iii Copyright 2001 by the National Electrical Manufacturers Association. and is installed in accordance with the National Electrical Code and properly maintained, the hazards to persons and property will be reduced. To
29、 continue to serve the best interests of users of Industrial Control and Systems equipment, the Industrial Automation Control Products and Systems Section is actively cooperating with other standardization organizations in the development of simple and more universal metrology practices. In this pub
30、lication, the U.S. customary units are gradually being supplemented 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 subjec
31、t to periodic review. They are revised frequently to reflect user input and to meet changing conditions and technical progress. Proposed revisions to this standards publication should be submitted to: Vice President, Technical Services National Electrical Manufacturers Association 1300 North 17th St
32、reet, Suite 1752 Rosslyn, Virginia 22209 This standards 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
33、time it was approved, the Industrial Automation Control Products and Systems Section consisted of the following members: ABB Inc. Raleigh, NC Bender Incorporated Coatesville, PA Carlo Gavazzi Automation Components Buffalo Grove, IL Clarke Fire Protection Products, Inc. Cincinnati, OH Cooper Industri
34、es plc Houston, TX Cummins Inc. Minneapolis, MN Eaton Corporation Cleveland, OH Electro Switch Corporation Weymouth, MA Elliott Control Company, Ltd. Willis, TX Emerson Electric Co. Saint Louis, MO GE Fairfield, CT Hubbell Incorporated Shelton, CT Joslyn Clark Controls, Inc. Lancaster, SC L-3 Commun
35、ications Power Paragon Anaheim, CA Legrand North America West Hartford, CT Magnetek Material Handling Menomonee Falls, WI Master Control Systems, Inc. Lake Bluff, IL Metron, Inc. Denver, CO Minarik Drives South Beloit, IL Mitsubishi Electric Automation, Inc. Vernon Hills, IL Omron Electronics LLC Sc
36、haumburg, IL Phoenix Contact Middletown, PA Post Glover Resistors, Inc. Erlanger, KY Powerohm Resistors, Inc. Katy, TX Reliance Controls Corporation Racine, WI ICS 6-1993 (R2001, R2006, R2011) Page iv Copyright 2001 by the National Electrical Manufacturers Association. Rockwell Automation Milwaukee,
37、 WI Russelectric, Inc. Hingham, MA Schneider Electric Palatine, IL SEW-Eurodrive, Inc. Lyman, SC Siemens Industry, Inc. Norcross, GA TE Connectivity Harrisburg, PA TIAX LLC Lexington, MA Tornatech Inc. Saint-Laurent, QC Toshiba International Corporation Houston, TX WAGO Corporation Germantown, WI WE
38、G Electric Corp. Duluth, GA Yaskawa America, Inc. Drives where a surface is supported at fewer than four edges, the width is to be considered the maximum dimension between supporting edges. Supported at the edge means fastened to or otherwise having a relatively solid support, stiffened member, or r
39、einforcing by forming so as to prevent or minimize the deflection of the sheet metal. Adjacent surfaces shall be permitted to have supports in common and be made of a single sheet. “Not limited“ applies only if the edge of the surface is flanged at least 1/2 inch (12.7 mm) or fastened to adjacent su
40、rfaces not normally removed in use. Sheet steel for an enclosure intended for outdoor use shall be not less than 0.034 inch (0.86 mm) thick if zinc coated and not less than 0.032 inch (0.81 mm) thick if uncoated. ICS 6-1993 (R2001, R2006, R2011) Page 5 Copyright 2001 by the National Electrical Manuf
41、acturers Association. Table 7-2 THICKNESS OF ALUMINUM, COPPER, OR BRASS SHEET METAL ENCLOSURES MAXIMUM DIMENSIONS OF ANY SURFACE, INCHES Without Supporting Frame* With Supporting Frame or Equivalent Reinforcing* Maximum Width* Maximum Length Maximum Width* Maximum Length Minimum Thickness 3.0 Not li
42、mited 7.0 Not limited 0.023 3.5 4.0 8.5 9.5 0.023 4.0 Not limited 10.0 Not limited 0.029 5.0 6.0 10.5 13.5 0.029 6.0 Not limited 14.0 Not limited 0.036 6.5 8.0 15.0 18.0 0.036 8.0 Not limited 19.0 Not limited 0.045 9.5 11.5 21.0 25.0 0.045 12.0 Not limited 28.0 Not limited 0.058 14.0 16.0 30.0 37.0
43、0.058 18.0 Not limited 42.0 Not limited 0.075 20.0 25.0 45.0 55.0 0.075 25.0 Not limited 60.0 Not limited 0.095 29.0 36.0 64.0 78.0 0.095 37.0 Not limited 87.0 Not limited 0.122 42.0 53.0 93.0 114.0 0.122 52.0 Not limited 23.0 Not limited 0.153 60.0 74.0 130.0 160.0 0.153 *A supporting frame structu
44、re is an angle or channel or a folded rigid section of sheet metal which is rigidly attached to and has essentially the same outside dimensions as the enclosure surface and which has sufficient torsional rigidity to resist the bending moments applied via the enclosure surface when it is deflected. Construction which is considered to have equivalent reinforcing may be accomplished by a multiplicity of designs that will produce a structure which is as rigid as one built with a frame of angles or channels. Constructions considered to be “without supporting frame“ include: a. A single sheet with
