1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA KS 1-2013Heavy Duty Enclosed and Dead-Front Switches (600 Volts Maximum) 2014 National Electrical Manufacturers Association NEMA Standards Publication KS 1-2013 Heavy Duty Enclosed and Dead-Front Switches (600 Volts Maximum)
2、 Published by: National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 2014 National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the
3、 Protection of Literary and Artistic Works, and the International and Pan American copyright conventions. 2014 National Electrical Manufacturers Association NOTICE AND DISCLAIMER The information in this publication was considered technically sound by a consensus among persons engaged in its developm
4、ent at the time it was approved. Consensus does not necessarily mean there was unanimous agreement among every person participating in the development process. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document herein is one, are deve
5、loped through a voluntary 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. Although NEMA administers the process and establishes rules to promote fairness in the development of
6、consensus, it does not write the documents, nor does it 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 othe
7、r damages of any nature, 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 an
8、y information published herein, and disclaims and makes no warranty that the information in this document will fulfill any particular purpose(s) or need(s). NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue of this standard
9、 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
10、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 circumstance. Information and other standards on the topic covered by this publication may be available from other sources, which the user m
11、ay 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 purpos
12、es. Any certification or other statement of compliance with any health- or safety-related information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. KS 1-2013 Page 1 2014 National Electrical Manufacturers Association CO
13、NTENTS Foreword . 2 Section 1 GENERAL 3 1.1 Scope . 3 1.2 REFERENCED STANDARDS . 3 1.3 Definitions . 4 Section 2 CHARACTERISTICS AND REQUIREMENTS OF SWITCHES 9 2.1 Ratings . 9 2.2 Accessories 10 2.3 Enclosures 14 2.4 Service Equipment . 15 2.5 Number of Switching Poles and Wires . 16 2.8 Spacings .
14、19 2.9 Terminals . 20 2.10 Fuseholders . 22 Section 3 TESTS . 27 3.1 PERFORMANCE Verification Tests . 27 3.2 Performance Tests . 28 3.3 Verification Testing . 50 3.4 Test Circuits and Calibration of Circuit and Instruments 51 Section 5 MARKING INFORMATION 59 5.4 Marking. 59 KS 1-2013 Page 2 2014 Nat
15、ional Electrical Manufacturers Association Foreword This standards publication is intended to provide the minimum requirements for heavy duty enclosed switches These standards are periodically reviewed by the Switch Section of NEMA for any revisions necessary to keep them up-to-date with advancing t
16、echnology. User needs have been considered throughout the development of this publication. Proposed or recommended revisions should be submitted to: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 This standards
17、publication was developed by the Switch 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 Switch Section was composed of the following members: ABB Control, Inc. Ne
18、w Berlin, WI Boltswitch, Inc. Crystal Lake, IL Bussmann by Eaton St. Louis, MO Eaton Electrical Pittsburgh, PA GE Industrial Systems Plainville, CT Hubbell Incorporated Shelton, CT Mersen USA LLC Newburyport, MA Siemens Industry, Inc. Norcross, GA Schneider Electric Palatine, IL KS 1-2013 Page 3 201
19、4 National Electrical Manufacturers Association Section 1 GENERAL 1.1 SCOPE This standards publication covers heavy duty enclosed and dead-front switches that are: a. Rated at not more than 600 volts and 4000 amperes with or without a horsepower rating. The dc ratings shall be up to and including 60
20、0 volts, 1200 amperes. b. With or without provision for fuses c. With current-carrying parts and mechanisms enclosed in metallic or nonmetallic cases, or that are enclosed when mounted in an enclosed switchboard, panelboard, or the like d. Manually operable by means of external handles NoteThese dev
21、ices may also be automatically operable by means of shunt trips, electrical operators, ground fault devices, or other mechanisms. This standards publication does not cover: a. The common form of snap switches b. Switching devices having features intended primarily for the starting and running protec
22、tion of electric motors as described in NEMA Standards Publications ICS 1, ICS 2, and ICS 3 c. Circuit-breaker-type power circuit protectors d. Molded case switches as described in NEMA AB 1 e. General duty switches meeting the minimum requirements of UL 98 f. Fused power-circuit devices as describe
23、d in UL 977 g. Pullout switches as described in UL 1429 Fuses, lampholders, receptacles, wire connectors, wires and cables, etc., which may be provided as parts of an enclosed switch, are covered under other NEMA standards publications. 1.2 REFERENCED STANDARDS National Electrical Manufacturers Asso
24、ciation 1300 North 17th Street, Suite 900 Rosslyn, VA 22209 KS 2 Distribution Equipment Switch Application Guide, A Users Reference KS 3 Guidelines for Inspection and Preventive Maintenance of Switches Used in Commercial and Industrial Applications FU 1 Low Voltage Cartridge Fuses AB 1 Molded Case C
25、ircuit Breakers and Molded Case Switches ICS 1 Industrial Control and Systems: General Requirements ICS 2 Industrial Control and Systems: Controllers, Contactors, and Overload Relays, Rated Not More Than 2000 Volts AC or 750 Volts DC KS 1-2013 Page 4 2014 National Electrical Manufacturers Associatio
26、n 250 Enclosures for Electrical Equipment (1000 Volts Maximum) National Fire Protection Association Batterymarch Park Quincy, MA 02269 NFPA 70 National Electrical Code NFPA 70B Electrical Equipment Maintenance Underwriters Laboratories, Inc. 333 Pfingsten Road Northbrook, IL 60062 UL 98 Enclosed and
27、 Dead-Front Switches UL 248-4 Class CC Fuses UL 248-7 Class H Non-renewable Fuses UL 248-8- Class J Fuses UL 248-9 Class K Fuses UL 248-10 Class L Fuses UL 248-12 Class R Fuses UL 248-15 Class T Fuses UL 977 Fused Power Circuit Devices UL 1429 Pullout Switches UL4248 Fuseholders 1.3 DEFINITIONS For
28、the purposes of this standards publication, the following definitions apply: accessory: A device that performs a secondary or minor duty as an adjunct or refinement to the primary or major duty of a unit of equipment. ambient temperature: The temperature of the surrounding medium that comes in conta
29、ct with the exterior of the switch enclosure. auxiliary switch: A switch mechanically operated by the main switching device for switching, signaling, interlocking or other purposes. Auxiliary switch contacts may be designated as a or b as indicated below, but other contact arrangements may be used:
30、a. “a“ Contacts that are open when the switch contacts are open and closed when the switch contacts are closed. KS 1-2013 Page 5 2014 National Electrical Manufacturers Association b. “b“ Contacts that are closed when the switch contacts are open and open when the switch contacts are closed. availabl
31、e fault current: The maximum current that the power system can deliver through a given circuit point to any negligible impedance short-circuit applied at that point. bolted-pressure contact switches: Switches in which an additional pressure or clamping action is provided at both ends of the switch b
32、lades when the blades are in a fully closed position. cartridge fuse: A fuse consisting of a current responsive element inside a fuse body with contacts on both ends. clearance: The shortest distance through air between two conductors or between a conductor and a grounded part. clearing I2t (ampere-
33、squared seconds): The measure of heat energy developed as a result of current flow between the time that current begins to flow and until the fuse clears the circuit. I2 stands for the square of the effective (rms) let-through current, and t stands for the time of current flow in seconds. conducting
34、 part: A part that is capable of conducting current. creepage distance: The shortest distance along the surface of an insulating material between two conductive parts. current-limiting fuse (AC): A fuse that safely interrupts all available currents within its interrupting rating and, within its curr
35、ent-limiting range, limits the clearing time at rated voltage to an interval equal to or less than the first major or symmetrical current loop duration and limits peak let-through current to a value less than the peak current that would be possible with the fuse replaced by a solid conductor of the
36、same impedance. current-limiting fuse rating: A rating expressed in terms of three characteristics that measure the degree by which the fuse limits current. These are threshold ratio, maximum peak let-through current, and maximum clearing I2t. current-limiting fuse range (AC): The range of symmetric
37、al rms available currents equal to or less than the interrupting rating in which the total clearing time at rated voltage and frequency is less than one half cycle. current rating: The designated maximum direct or alternating operating current in rms amperes at rated frequency for which the switch q
38、ualifies under specified test conditions. deadfront switch: A switch that has all current carrying parts enclosed when it is mounted in an enclosed panelboard, deadfront switchboard, or the like. (See 3.3). design tests: Tests made to determine the adequacy of the design of a particular type, style,
39、 or model of equipment or its component parts to meet its assigned ratings and to operate satisfactorily under usual service conditions. Design tests should be made only on representative equipment to substantiate the ratings assigned to all other apparatus of basically the same design. These tests
40、are not intended to be used as a part of normal production. The applicable portion of these design tests may also be used to evaluate modifications of a previous design and to assure that performance has not been adversely affected. Test data from previous similar designs may be used for current des
41、igns where appropriate. dielectric tests: Tests made to determine the ability of insulating materials and spacings used to withstand specified overvoltages. KS 1-2013 Page 6 2014 National Electrical Manufacturers Association double-throw switch: A switch by means of which a change in circuit connect
42、ions can be obtained by operating the switch into either of two closed positions or into an open position. electrical close: A means for releasing energy previously stored in a mechanism to close a switch upon the application of a specified voltage. electrical operator: A means of electrically closi
43、ng and opening the contacts of a device through the use of a motor or similar means. electrical trip: See shunt trip. enclosed switch: A switch with or without fuseholders, having all current carrying parts completely enclosed, that is operable without opening the enclosure. enclosure: A surrounding
44、 case constructed to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection to the enclosed equipment against specified environmental conditions. fuse: A protective device that opens by the melting of a current-sensiti
45、ve element during specified overcurrent conditions. fuse clips: The contacts of the fuseholder that support the fuse and connect the fuse terminals with the circuit. fuseholder: An assembly of base, fuse clips, and necessary insulation for the mounting or connecting of a fuse into a circuit. fuse in
46、terrupting rating: The highest direct or rms alternating current that the fuse is capable of interrupting safely under specified conditions. fusible switch; switch fuse: A switch in which one or more poles have a fuse in series in a composite unit. These switches should not be confused with switches
47、 in which the fuse forms the moving contact. ground (earth) (electric system): A conducting connection, whether intentional or accidental, by which an electric circuit or equipment is connected to the earth or to some conducting body of relatively large extent that serves in place of the earth. A gr
48、ound is used for establishing and maintaining the potential of the earth (or of the conducting body) or approximately that potential, on conductors connected to it, and for conducting ground current to and from the earth (or the conducting body). Ground (Earth) may have an identification symbol in a
49、ccordance with IEC Publication 417: 417 IEC-5019 Protective ground (earth) hazardous materials: Those gases, vapors, combustible dusts, fibers, or flyings that are explosive under certain conditions. hazardous locations: Those areas that contain hazardous materials in sufficient quantity to create an explosion (See Article 500, National Electrical Code). KS 1-2013 Page 7 2014 National Electrical Manufacturers Association high-pressure butt contact switches: Devices having butt type contacts and a spring-charged mec
