NEMA ICS 14-2015 Application Guide for Electric Fire Pump Controllers.pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 14-2015Application Guide for Electric Fire Pump ControllersNEMA Standards Publication ICS 14-2015 Application Guide for Electric Fire Pump ControllersPublished by:National Electrical Manufacturers Association1300 North 1

2、7thStreet, Suite 900Rosslyn, Virginia 22209www.nema.org 2015 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 Inter

3、national and Pan American copyright conventions. 2015 National Electrical Manufacturers AssociationNOTICE AND DISCLAIMERThe 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 develope

4、d. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document.American National Standards Institute, Inc. (ANSI) standards and guideline publications, of which the document contained herein is one, are developed through

5、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 development of consens

6、us, 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, property, or other dama

7、ges 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 accuracy or completeness

8、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 services by virtue of this

9、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 this document should r

10、ely 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 other sources, which th

11、e 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 installations for safety or health

12、 purposes. 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. 2015 National Electrical Manufacturers Association 2015 Nationa

13、l Electrical Manufacturers AssociationNEMA ICS 14-2015Page iForewordThis Application Guide was prepared by a technical committee of the National Electrical Manufacturers Association (NEMA) Industrial Control and Systems Section. It was approved in accordance with the bylaws of NEMA. This Application

14、 Guide provides practical information concerning the general technical considerations in the installation of electric fire pump controllers. It is intended to be used by specifiers, purchasers, installers, and owners of fire pump controllers.This Application Guide represents the result of many years

15、 of research, investigation, and experience by the members of the NEMA Industrial Control and Systems Subcommittee on Fire Pump Control. It was written as a service in response to the many questions from the user public, specifiers, and inspection authorities regarding fire pump controller installat

16、ions. The intent is to pursue excellence in design, manufacture, and service of products made by NEMA member companies. It has been developed through continued consultation among manufacturers, users, and national engineering societies. It is not intended to instruct the user on use of fire pump con

17、trol equipment except to provide recommendations and some application guidance.This Application Guide is necessarily confined to providing recommendations for a successful installation. When equipment conforming with these recommendations is properly selected, installed in accordance with the Nation

18、al Electrical Code(NFPA 70) and the Standard for the Installation of Stationary Pumps for Fire Protection (NFPA 20), and properly maintained, the hazards to persons and property will be reduced. However, since any piece of industrial control equipment can be installed, operated, and maintained in su

19、ch a manner that hazardous conditions might result, following the recommendation of this Guide does not by itself assure a safe installation.NEMA publications are subject to periodic review. They are revised frequently to reflect user input and to meet changing conditions and technical progress. Use

20、rs should secure the latest editions.Proposed revisions to this Application Guide should be submitted to:Senior Technical Director, OperationsNational Electrical Manufacturers Association1300 North 17thStreet, Suite 900Rosslyn, VA 22209 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2

21、015Page iiContentsForeword . iSection 1 GENERAL 11.1 Scope 11.2 Referenced Publications .11.3 Special Considerations for Fire Pump Controllers 1Section 2 DESIGN CONSIDERATIONS 32.1 Power Conductors Connected to the Fire Pump Controller and Motor .32.2 Environmental Considerations for Enclosures 52.3

22、 Transformer Sizing 72.4 Transfer Switch Considerations 82.5 Considerations for Specifying Short Circuit Rating (RMS SYM) . 112.6 Reduced-Voltage Starting Methods 152.7 Limited Service Controller Limitations .162.9 Pressure Recorders 172.10 Stand-by Generator Sizing for Fire Pumps .172.11 Medium-Vol

23、tage Fire Pump Controllers (7.2 Kv Max) .172.12 Variable-Speed Pressure-Limiting Electric Fire Pump Controllers 182.13 Upstream Overcurrent Protection in Fire Pump Circuits .212.14 Phase Converters 21Section 3 INSTALLATION CONSIDERATIONS 213.1 Phase Sequence .223.2 Normal Starting with On-site Gener

24、ators 223.3 Induced Voltages on Contacts for Remote Signaling 223.4 Grounded Circuit Conductor (Neutral or Neutral Conductor) Considerations 23Section 4 OTHER CONSIDERATIONS 254.1 Listed and Approved Equipment .254.2 Testing and Maintenance 25FiguresFigure 1 Typical Fire Pump Controller and Transfer

25、 Switch Arrangements I and II: Normal Source from a Utility and Alternate Source from an On-site Generator . 9Figure 2 Other Fire Pump Controller and Transfer Switch Configurations for Arrangement I: Dual Utility or Two or More Alternate Sources 10Figure 3 Variable-Speed Pressure-Limiting Electric F

26、ire Pump Controller 20Figure 4 Typical Service Entrance Connection with Metallic Conduit for Three-Phase Circuits Using Four Wires 24 2015 National Electrical Manufacturers Association 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2015Page iiiTables Table 1-1 Comparison of Specific A

27、pplications of Enclosures for Indoor Nonhazardous (Non-classified) Locations .6Table 1-2 Comparison of Specific Applications of Enclosures for Indoor and Outdoor Nonhazardous (Non-classified) Locations 7Table 2 Fire Pump Controller Short-Circuit Current Rating .12Table 3 Transformer Secondary Voltag

28、e and Available Secondary Short-Circuit Current .14Table 4 Reduced-Voltage Starting Methods 15 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2015Page iv 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2015Page 1 2015 National Electrical Manufacturers AssociationSection

29、1 GENERAL11 SCOPEThis Application Guide is intended to provide general guidelines for the proper application of fire pump controllers. The emphasis of these guidelines is to stress those considerations specific to fire pump installations. The latest editions and revisions of the applicable NEMA stan

30、dards and the standards of other standards developing organizations should also be consulted.12 REFERENCED PUBLICATIONSIEEE 242 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power SystemsNEMA 250 Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA IC

31、S 3 Industrial Control and Systems: Medium Voltage Controllers Rated 2001 to 7200 Volts ACNEMA ICS 3.1 Industrial Control and Systems. Handling, Storage and Installation Guide for AC General Purpose Contactors and Class E Controllers, 50 the performance, maintenance, and acceptance testing of the fi

32、re pump system and the internal wiring of system components are covered in NFPA 20. Periodic testing of the complete fire protection system is addressed in NFPA 25. These requirements are, in many significant ways, uniquely different from those pertaining to industrial, commercial, and residential i

33、nstallations in order to increase system reliability. As an overview, some of these differences:a) Service Disconnects Special rules pertaining to the service disconnects in order to minimize inadvertent disconnection (NFPA 70, 695.3(A)(1), which refers to 230.82(5), 230.2, and 230.72(B). Only one u

34、pstream dis-connect and associated over current protective device is permitted (NFPA 70 695.4(B)(1).b) Conductor Protection 1. Special overcurrent and physical protection requirements for the power supply conductors exist to minimize potential interruption during a fire (NFPA 70, 695.3(A), 695.4(B)(

35、1), and 695.5(C)(2). 1Particular attention should be given to chapters 9 and 10.2Particular attention should be given to Article 695. 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2015Page 22. Coordinated overcurrent protection of the motor branch circuit conductors to trip the circu

36、it breaker in the fire pump controller rather than an upstream device (NFPA 70, 240.12). c) No Motor Overload Protection Fire pump motor protection is limited to locked rotor and short circuit protection only (NFPA 20, 10.4.3 and 10.4.4).d) Critical Components Certain conductors and electrical compo

37、nents are not protected from overcurrent in the interest of getting a distressed pump going (NFPA 20, 10.4.3, 10.4.4, and NFPA 70, 695.6(C).e) No Ground Fault Protection Ground fault protection is prohibited (NFPA 70, 695.6(G), 240.13).f) Control Circuits1. External control circuits that extend outs

38、ide the fire pump room shall be arranged so that fail-ure of any external circuit (open or short-circuit) shall not prevent operation of pump(s) from all other internal or external means (NFPA 20, 10.5.2.6; NFPA 70, 695.14(A).2. Failure of external control circuits may cause a motor run condition (N

39、FPA 20, 10.5.2.6.2; NFPA 70, 695.14).3. Overcurrent protection in necessary control circuits is prohibited (NFPA 20, 10.3.5). g) Fire Pump Controller Circuit Breaker Settings 1. The trip setting of the fire pump controller circuit breaker can be up to 20 times motor full load current (NFPA 20, 10.4.

40、3.3.1(6).2. The fire pump controller circuit breaker shall have a continuous rating of not less than 115 percent of full-load current and shall not trip when carrying up to 300 percent of motor full-load current for at least 3 minutes. (NFPA 20, 10.4.3.3.1(1), 10.4.4(1)(b).3. The fire pump controlle

41、r circuit breaker shall trip between 8 and 20 seconds at motor locked-rotor current (NFPA 20, 10.4.4(1)(a). h) Remote Control Stations Remote control stations shall not be capable of stopping the fire pump (NFPA 20, 10.5.2.4).i) Supplying Other Equipment Fire pump controllers may not be used as a ju

42、nction box to supply other equipment (including jockey pumps) (NFPA 20, 10.3.4.6 NFPA 70, 695.6(i)(6).j) Automatic Non-pressure Switch-actuated Starting A non-pressure switch-actuated automatic fire pump controller shall commence its starting se-quence by the automatic opening of a remote contact (N

43、FPA 20, 10.5.2.2 or 10.5.2.2.1). NOTESee 2.12 for significant deviations for medium-voltage fire pump controllers, and refer to NFP A 70, Article 490. 2015 National Electrical Manufacturers AssociationNEMA ICS 14-2015Page 3Section 2 DESIGN CONSIDERATIONS21 POWER CONDUCTORS CONNECTED TO THE FIRE PUMP

44、 CONTROLLER AND MOTOR211 This is a suggested procedure for properly sizing power supply conductors to the fire pump controller and motor to meet the requirements of NFPA 20 and NFPA 70:a) Determine the motor full-load current from the motor nameplate or NFPA 70, Table 430.250.b) Multiply the full-lo

45、ad current by 1.25, per NFPA 70, 695.6B(1).c) Select supply conductor size per NFPA 70, 310.15 and Table 310.15(B)(16), based on current calculated in step b above. Use 75C column as appropriate (see NFPA 70, 110.14C). For conductors from the controller to wye-delta, and part-winding motors where si

46、x leads are required, sizing should be as follows:1. Part-windingEach conductor carries 50% of the motor full-load current (see NFP A 70, 430.22D)2. Wye-deltaEach conductor carries 58% of the motor full-load current (see NFPA 70, 430.22 C). Parallel conductors might be required for large motors. See

47、 NFPA 70, 310.10(H), and refer to controller manufacturers field connection instructions for conductor termination information. d) Verify that the conductor size will provide compliance with the voltage drop limitations, as outlined in NFPA 20, 9.4 or NFPA 70, 695.7.NOTENFPA 70 does not require cond

48、uctors to be sized to carry a minimum of 300% of motor full-load current or locked-rotor current indefinitely. See NFPA 70, 695.6(B)(1) and 695.6(B)(2).e) Consult motor manufacturers connection diagram for proper connections to the controller.Example: 300 HP, 460 V, 60 Hz controller is located 500 ft from the utility supply, and the motor is 25 ft from the controller. Example is b