REG UFGS-26 28 21 00 40-2011 AUTOMATIC TRANSFER SWITCHES.pdf

1、*USACE / NAVFAC / AFCESA / NASA UFGS-26 28 21.00 40 (August 2011)-Preparing Activity: NASA SupersedingUFGS-26 28 21.00 40 (August 2010)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SECTION TABLE OF CONTENTSDIVISION 26 - ELECTRICALSECTION 26 28 21.00

2、40AUTOMATIC TRANSFER SWITCHES08/11PART 1 GENERAL1.1 REFERENCES1.2 SUBMITTALS1.3 PREDICTIVE TESTING AND INSPECTION TECHNOLOGY REQUIREMENTS1.4 QUALIFICATION TESTINGPART 2 PRODUCTS2.1 SYSTEM DESCRIPTION2.1.1 Design Requirements2.1.2 Performance Requirements2.2 FABRICATION2.2.1 Short Circuit Withstand C

3、urrent Rating2.2.2 Self-Test Capability2.2.3 Enclosures2.3 COMPONENTS2.3.1 Contacts2.3.2 Indicating Lights2.3.3 Terminal Board2.4 OPERATION2.5 ACCESSORIESPART 3 EXECUTION3.1 INSTALLATION3.2 FIELD TESTING- End of Section Table of Contents -SECTION 26 28 21.00 40 Page 1Provided by IHSNot for ResaleNo

4、reproduction or networking permitted without license from IHS-,-,-*USACE / NAVFAC / AFCESA / NASA UFGS-26 28 21.00 40 (August 2011)-Preparing Activity: NASA SupersedingUFGS-26 28 21.00 40 (August 2010)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SEC

5、TION 26 28 21.00 40AUTOMATIC TRANSFER SWITCHES08/11*NOTE: This guide specification covers the requirements for automatic transfer switches for use with engine-generator sets for standby power.Adhere to UFC 1-300-02 Unified Facilities Guide Specifications (UFGS) Format Standard when editing this guid

6、e specification or preparing new project specification sections. Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information.Remove information and requirements not required i

7、n respective project, whether or not brackets are present.Comments, suggestions and recommended changes for this guide specification are welcome and should be submitted as a Criteria Change Request (CCR).*PART 1 GENERAL*NOTE: If Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS is not in

8、cluded in the project specification, applicable requirements therefrom should be inserted and the following paragraph deleted.*Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS applies to work specified in this section.1.1 REFERENCES*NOTE: This paragraph is used to list the publications

9、cited in the text of the guide specification. The publications are referred to in SECTION 26 28 21.00 40 Page 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-the text by basic designation only and listed in this paragraph by organization, designatio

10、n, date, and title.Use the Reference Wizards Check Reference feature when you add a RID outside of the Sections Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizards Check Reference feature to update the issue dates.References not used in the

11、 text are automatically deleted from this section of the project specification when you choose to reconcile references in the publish print process.*The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic

12、 designation only.NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA)RCBEA GUIDE (2004) NASA Reliability Centered Building and Equipment Acceptance GuideNATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA 250 (2008) Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA ICS 1 (2000; R 20

13、05; R 2008) Standard for Industrial Control and Systems: General RequirementsNATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70 (2011; TIA 11-1; Errata 2011) National Electrical CodeUNDERWRITERS LABORATORIES (UL)UL 1008 (2011) Transfer Switch EquipmentUL 508 (1999; Reprint Apr 2010) Industrial Contr

14、ol Equipment1.2 SUBMITTALS*NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. Keep submittals to the minimum required for adequate quality control.A “G” following a submitta

15、l item indicates that the submittal requires Government approval. Some submittals are already marked with a “G”. Only SECTION 26 28 21.00 40 Page 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-delete an existing “G” if the submittal item is not com

16、plex and can be reviewed through the Contractors Quality Control system. Only add a “G” if the submittal is sufficiently important or complex in context of the project.For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be use

17、d following the “G“ designation to indicate the approving authority. Codes for Army projects using the Resident Management System (RMS) are: “AE“ for Architect-Engineer; “DO“ for District Office (Engineering Division or other organization in the District Office); “AO“ for Area Office; “RO“ for Resid

18、ent Office; and “PO“ for Project Office. Codes following the “G“ typically are not used for Navy, Air Force, and NASA projects.Choose the first bracketed item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects.*Government approval is required for submittals

19、with a “G“ designation; submittals not having a “G“ designation are for Contractor Quality Control approval.for information only. When used, a designation following the “G“ designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Se

20、ction 01 33 00 SUBMITTAL PROCEDURES:SD-02 Shop DrawingsConnection Diagrams; G; G, _Fabrication Drawings; G; G, _Installation Drawings; G; G, _SD-03 Product DataEquipment and Performance Data; G; G, _Contacts; G; G, _Indicating Lights; G; G, _Terminal Board; G; G, _Enclosures; G; G, _Accessories; G;

21、G, _SD-06 Test ReportsQualification Testing; G; G, _Operation Tests; G; G, _SECTION 26 28 21.00 40 Page 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SD-07 CertificatesListing of Product Installations; G; G, _SD-08 Manufacturers InstructionsAutoma

22、tic Transfer Switch; G; G, _1.3 PREDICTIVE TESTING AND INSPECTION TECHNOLOGY REQUIREMENTS*NOTE: The Predictive Testing and Inspection (PT&I) tests prescribed in section 01 86 26.07 40 RELIABILITY CENTERED ACCEPTANCE FOR ELECTRICAL SYSTEMS are MANDATORY for all NASA _ assets and systems identified as

23、 Critical, Configured, or Mission Essential. If the system is non-critical, non-configured, and not mission essential, use sound engineering discretion to assess the value of adding these additional test and acceptance requirements. See Section 01 86 26.07 40 RELIABILITY CENTERED ACCEPTANCE FOR ELEC

24、TRICAL SYSTEMS for additional information regarding cost feasibility of PT&I.*This section contains systems and/or equipment components regulated by NASAs Reliability Centered Building and Equipment Acceptance Program. This program requires the use of Predictive Testing and Inspection (PT&I) technol

25、ogies in conformance with RCBEA GUIDE to ensure building equipment and systems installed by the Contractor have been installed properly and contain no identifiable defects that shorten the design life of a system and/or its components. Satisfactory completion of all acceptance requirements is requir

26、ed to obtain Government approval and acceptance of the Contractors work.Perform PT&I tests and provide submittals as specified in Section 01 86 26.07 40 RELIABILITY CENTERED ACCEPTANCE FOR ELECTRICAL SYSTEMS.1.4 QUALIFICATION TESTINGProvide certified independent laboratory test data for the furnishe

27、d unit or an identical unit. Ensure tests meet the general use requirements of UL 508, Table 22.1. Subject the complete automatic transfer switch to a test as outlined in NEMA ICS 1, paragraph 109.5. One cycle of operation tests under the UL 508 test requirements consists of a transfer of load from

28、the normal source to the emergency source and retransfer to the normal source. After the required number of test cycles, ensure the temperature rise of the contacts has not exceeded 65 degrees C 149 degrees F. Test the switch operating time and the sense relay pickup and dropout times.PART 2 PRODUCT

29、S2.1 SYSTEM DESCRIPTIONProvide a complete automatic transfer switch system for use with engine-generator sets for standby power. Submit the following:a. Connection diagrams showing the relations and connections of contacts, indicating lights, and terminal board by showing the general physical SECTIO

30、N 26 28 21.00 40 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-layout of all controls, the interconnection of one system (or portion of system) with another.b. Fabrication drawings for contacts, indicating lights, terminal board enclosures, a

31、nd accessories consisting of fabrication and assembly details to be performed in the factory.c. Installation drawings for automatic transfer equipment in accordance with the paragraph entitled, “Installation,“ of this section.d. Equipment and performance data for automatic transfer equipment includi

32、ng life, test, system functional flows, safety features, and mechanical automated details.2.1.1 Design RequirementsEnsure control and protective devices associated with automatic transfer switches are in accordance with Section 26 05 70.00 40 HIGH VOLTAGE OVERCURRENT PROTECTIVE DEVICES and Section 2

33、6 05 71.00 40 LOW VOLTAGE OVERCURRENT PROTECTIVE DEVICES.*NOTE: Show required automatic transfer switch amperage, voltage, and frequency ratings on the drawings.*Provide an automatic transfer switch of the two-pole type for single-phase application, and three-pole type for three-phase application. P

34、rovide a solid neutral conductor connection for neutral transfer from normal source to emergency source.Provide an additional switched neutral pole.2.1.2 Performance RequirementsProvide an automatic transfer switch capable of transferring the load from the normal power source to emergency power sour

35、ce, and from an emergency source to the normal power source. Locate switch where indicated. Provide a switch that is solenoid-operated, mechanically held, double-throw, rated for continuous duty, capable of transferring in 100 milliseconds or less, and conforming to the applicable requirements of UL

36、 1008 and NFPA 70, Article 700, except as herein modified.Ensure the automatic transfer switch is capable of being placed in either the normal or the emergency position.2.2 FABRICATION2.2.1 Short Circuit Withstand Current Rating*NOTE: Add to this specification or to the drawings the short-circuit wi

37、thstand current rating of the switch based on the calculated short-circuit current available at the switch location.*Provide switch with short-circuit current rating of _. Ensure switch is capable of withstanding _ amperes for a period of _ seconds without damage.SECTION 26 28 21.00 40 Page 6Provide

38、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2.2 Self-Test CapabilityProvide an automatic transfer switch with a control-circuit self-test feature capable of verifying the proper operation of the switch control circuit without moving the main contactor

39、 or causing discontinuity of service to the load. Include the following characteristics in the self-test circuit:a. A key-operated switch that disconnects the main actuator and connects in its place, an indicator light. Design the key-operated switch to prevent removal of the key while the switch is

40、 in the self-test mode.b. A power-failure simulator switch that removes voltage from the voltage-sensing devices so that emergency power activates the test light.2.2.3 EnclosuresProvide automatic transfer switch enclosures with solid, unventilated, code-gage 2 millimeter 14-gage, minimum sheet metal

41、, NEMA 250, Type 1, with manufacturers standard finish.2.3 COMPONENTS2.3.1 ContactsProvide main contacts with a wiping-action silver alloy that, when rated for operation at 50 amperes or greater, are protected against arcing. Ensure auxiliary contacts and control transfer relay contacts have a minim

42、um continuous current rating of not less than 10-amperes inductive at 120 volts ac. Provide the following auxiliary contacts:a. Generator-control contacts, normally open, that close on undervoltage or loss of normal power as specified, remaining closed until transfer back to normal powerb. Emergency

43、-position contacts, normally open when the switch is in the normal position, that close when the switch is in the emergency positionc. Normal position contacts, normally closed when the switch is in the normal position, that open when the switch is in the emergency positionUse two pole auxiliary contacts.*NOTE: Fill in automatic transfer switch mounting location, such as: on door of enclosure, remote, or mounted externally on switchgear.*Provide a test automati