VA 26 36 23-2010 AUTOMATIC TRANSFER SWITCHES.pdf

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1、09-10 26 36 23 - 1 SECTION 26 36 23 AUTOMATIC TRANSFER SWITCHES SPEC WRITER NOTE: Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing

2、, installation, connection, and testing of open-transition automatic transfer switches with bypass isolation. 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Seismic requirements for non-structural equipment./ /B. Section 14 21 00, ELECTRIC TRACTI

3、ON ELEVATORS: Requirements for elevator operation./ /C. Section 14 24 00, HYDRAULIC ELEVATORS: Requirements for elevator operation./ D. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section in Division 26. E. S

4、ection 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring. F. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personal safety and to provide a low impedance path for possible ground fault currents. G. Section 26 05 3

5、3, RACEWAYS AND BOXES FOR ELECTRICAL SYSTEMS: Raceways for power and control wiring. H. Section 26 05 71, ELECTRICAL SYSTEM PROTECTIVE DEVICE STUDY: Requirements for a coordinated electrical system. I. Section 26 13 13, GENERATOR PARALLELING CONTROLS: Paralleling controls for multiple generators. J.

6、 Section 26 32 13, ENGINE-GENERATORS: Requirements for normal and emergency power generation. K. Section 27 05 11, REQUIREMENTS FOR COMMUNICATIONS INSTALLATIONS: General communications requirements that are common to more than one section in Division 27. L. Section 27 05 33, RACEWAYS AND BOXES FOR C

7、OMMUNICATION SYSTEMS: Raceways for communications cabling. M. SECTION 27 15 00, COMMUNICATIONS HORIZONTAL CABLING: Communications media for interconnecting automatic transfer switches and remote control and annunciation components. Provided by IHSNot for ResaleNo reproduction or networking permitted

8、 without license from IHS-,-,-09-10 26 36 23 - 2 1.3 QUALITY ASSURANCE A. QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. SPEC WRITER NOTE: Edit the paragraph below to match local maintenance and support availability. B. A factory

9、-authorized representative shall maintain a service center capable of providing emergency maintenance and repair services at the project site within a /8/ / / hour maximum response time. C. Automatic transfer switch, bypass/isolation switch, and annunciation control panels shall be products of same

10、manufacturer. D. Comply with OSHA 29 CFR 1910.7 for the qualifications of the testing agency. 1.4 FACTORY TESTS A. Automatic transfer switches shall be thoroughly tested at the factory to ensure that there are no electrical or mechanical defects. Tests shall be conducted per UL standards. Factory te

11、sts shall be certified. The following factory tests shall be performed: 1. Visual inspection to verify that each ATS is as specified. 2. Mechanical test to verify that ATS sections are free of mechanical hindrances. 3. Insulation resistance test to ensure integrity and continuity of entire system. 4

12、. Main switch contact resistance test. 5. Electrical tests to verify complete system electrical operation and to set up time delays and voltage sensing settings. 1.5 SUBMITTALS A. Submit in accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. B. Shop Drawings: 1. Clearly pres

13、ent sufficient information to determine compliance with drawings and specifications. 2. Include electrical ratings (including withstand), dimensions, weights, mounting details, conduit entry provisions front view, side view, equipment and device arrangement, elementary and interconnection wiring dia

14、grams, factory relay settings, and accessories. 3. For automatic transfer switches that are networked together to a common means of annunciation and/or control, submit interconnection diagrams and site and building plans, showing connections for normal and emergency sources of power, load, control a

15、nd annunciation Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 36 23 - 3 components, and interconnecting communications paths. Equipment locations on the diagrams and plans shall match the site, building, and room designations on the constr

16、uction drawings. 4. Complete nameplate data, including manufacturers name and catalog number. 5. A copy of the markings that are to appear on the transfer switches when installed. C. Manuals: 1. When submitting the shop drawings, submit companion copies of complete maintenance and operating and main

17、tenance manuals, including technical data sheets, wiring diagrams and information, such as telephone number, fax number and web sites, for ordering replacement parts. 2. Two weeks prior to final inspection, submit four copies of a final updated maintenance and operating manual to the /Resident Engin

18、eer/ /COTR/. a. Include complete “As Installed“ diagrams that indicate all pieces of equipment and their interconnecting wiring. b. Include complete diagrams of the internal wiring for each piece of equipment, including “As Installed“ revisions of the diagrams. c. The wiring diagrams shall identify

19、the terminals to facilitate installation, maintenance, operation, and testing. D. Certifications: 1. When submitting the shop drawings, submit a certified test report from a recognized independent testing laboratory that a representative sample has passed UL 1008 prototype testing. 2. Two weeks prio

20、r to final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/: a. Certification that no design changes have been made to the switch or its components since last certified by UL or tested by an independent laboratory. b. Certification by the manufacturer that the equipm

21、ent conforms to the requirements of the drawings and specifications. c. Certification that the withstand current rating has been coordinated with upstream protective devices. d. Certification by the contractor that the equipment has been properly installed, adjusted, and tested. e. A certified test

22、report from an independent laboratory that a representative sample has passed the ANSI surges withstand test for transfer switches which incorporate solid-state components. SPEC WRITER NOTE: Refer to VA Handbook H-18-8 for Seismic Design Requirements. Provided by IHSNot for ResaleNo reproduction or

23、networking permitted without license from IHS-,-,-09-10 26 36 23 - 4 Identify Region of Seismicity based on location of the equipment so that automatic transfer switch manufacturers can determine the necessary seismic strength of their equipment. Delete the following paragraph if the automatic trans

24、fer switch(s) is located outside the seismic zone. /f. Certification from the manufacturer that the automatic transfer switch(s), accessories, and components will withstand the seismic forces and that the unit will be fully operational after the zone seismic event at the project site. Certification

25、shall be based upon simulated seismic forces, not by calculation./ 1.6 APPLICABLE PUBLICATIONS A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text by desig

26、nation only: B. Institute of Electrical and Electronic Engineers (IEEE): 446-95 . Recommended Practice for Design and Maintenance of Emergency and Standby Power Systems C37.90.1-02 Surge Withstand Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus C62.41.1-0

27、2 Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power Circuits C62.41.2 . Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits C. National Electrical Manufacturers Association (NEMA): 250-03 . Enclosure for Electrical Equipment (

28、1000 Volts Maximum) ICS 6-06 . Enclosures IC3 4-05 . Industrial Control and Systems: Terminal Blocks MG 1-07 Motors and Generators D. National Fire Protection Association (NFPA): 7008 National Electrical Code (NEC) 99-05 Health Care Facilities 110-10 . Emergency and Standby Power Systems E. Underwri

29、ters Laboratories, Inc. (UL): 50-95 Enclosures for Electrical Equipment 508-99 . Industrial Control Equipment 891-05 . Dead-Front Switchboards 1008-96 Transfer Switch Equipment Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 36 23 - 5 PART 2

30、 - PRODUCTS 2.1 OPEN-TRANSITION AUTOMATIC TRANSFER SWITCH A. General: 1. Comply with UL, NEMA, NEC, ANSI, IEEE, and NFPA. SPEC WRITER NOTE: For new automatic transfer switches in a new Essential Electrical System, VA requires 4-pole switches. Otherwise, match the type of switches in the existing sys

31、tem. 2. Automatic transfer switches are to be /4-/ / / pole draw-out construction, electrically operated, mechanically held open contact type, without integral overcurrent protection. Automatic transfer switches utilizing automatic or non-automatic molded case circuit breakers, insulated case circui

32、t breakers, or power circuit breakers as switching mechanisms are not acceptable. 3. Automatic transfer switches shall be completely factory-assembled and wired such that only external circuit connections are required in the field. 4. Each automatic transfer switch shall be equipped with an integral

33、 bypass/isolation switch. 5. Ratings: a. Phases, voltage, ampere rating, poles, and withstand current rating shall be as shown on the drawings. b. Transfer switches are to be rated for continuous duty at specified continuous current rating on 60Hz systems. c. Maximum automatic transfer switch rating

34、: 800 A. 6. Markings: a. Markings shall be in accordance with UL 1008. b. Markings for the additional withstand test specified below shall be included in the nameplate data. 7. Tests: Automatic transfer switches shall be tested in accordance with UL 1008. The contacts of the transfer switch shall no

35、t weld during the performance of withstand and closing tests when used with the upstream overcurrent device and available fault current specified. SPEC WRITER NOTE: Show the available short-circuit current at the transfer switch location on the drawings. 8. Surge Withstand Test: Transfer switches ut

36、ilizing solid-state devices in sensing, relaying, operating, or communication equipment or circuits shall comply with IEEE C37.90.1. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 36 23 - 6 9. Housing: a. Enclose automatic transfer switches

37、 in wall- or floor-mounted steel cabinets, with metal gauge not less than No. 14, in accordance with UL 508, or in a switchboard assembly in accordance with UL 891, as shown on the drawings. b. Enclosure shall be constructed so that personnel are protected from energized bypass-isolation components

38、during automatic transfer switch maintenance. c. Automatic transfer switch components shall be removable without disconnecting external source or load power conductors. d. Finish: Cabinets shall be given a phosphate treatment, painted with rust-inhibiting primer, and finish-painted with the manufact

39、urers standard enamel or lacquer finish. e. Viewing Ports: Provide viewing ports so that contacts may be inspected without disassembly. B. Automatic transfer switches shall include the following features: 1. Operating Mechanism: a. Actuated by an electrical operator. b. Electrically and mechanically

40、 interlocked so that the main contact cannot be closed simultaneously in either normal and emergency position. c. Normal and emergency main contacts shall be mechanically locked in position by the operating linkage upon completion of transfer. Release of the locking mechanism shall be possible only

41、by normal operating action. d. Contact transfer time shall not exceed six cycles. e. Operating mechanism components and mechanical interlocks shall be insulated or grounded. 2. Contacts: a. Main contacts: Silver alloy. b. Neutral contacts: Silver alloy, with /same current rating as phase contacts/ /

42、continuous current rating not less than twice the rating of the phase contacts/. c. Current carrying capacity of arcing contacts shall not be used in the determination of the automatic transfer switch rating, and shall be separate from the main contacts. d. Main and arcing contacts shall be visible

43、for inspection with cabinet door open and barrier covers removed. 3. Manual Operator: Capable of operation by one person in either direction under no load. 4. Replaceable Parts: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 36 23 - 7 a. In

44、clude the main and arcing contact individually or as units, relays, and control devices. b. Switch contacts and accessories shall be replaceable from the front without removing the switch from the cabinet and without removing main conductors. 5. Sensing Relays: a. Undervoltage Sensing for Each Phase

45、 of Normal Source: Sense low phase-to-ground voltage on each phase. Pickup voltage shall be adjustable from 85 to 100% of nominal, and dropout voltage is adjustable from 75 to 98% of pickup value. Factory set for pickup at 90% and dropout at 85%. b. Adjustable Time Delay: For override of normal-sour

46、ce voltage sensing to delay transfer and engine start signals. Adjustable from zero to six seconds, and factory set for one second. c. Voltage/Frequency Lockout Relay: Prevent premature transfer to generator. Pickup voltage shall be adjustable from 85 to 100% of nominal. Factory set for pickup at 90

47、%. Pickup frequency shall be adjustable from 90 to 100% of nominal. Factory set for pickup at 95%. d. Time Delay for Retransfer to Normal Source: Adjustable from 0 to 30 minutes, and factory set for 10 minutes to automatically defeat delay on loss of voltage or sustained undervoltage of emergency so

48、urce, provided normal supply has been restored. e. Test Switch: Simulate normal-source failure. f. Switch-Position Pilot Lights: Indicate source to which load is connected. g. Source-Available Indicating Lights: Supervise sources via transfer switch normal- and emergency-source sensing circuits. h.

49、Normal Power Supervision: Green light with nameplate engraved “Normal Source Available.“ i. Emergency Power Supervision: Red light with nameplate engraved “Emergency Source Available.“ j. Transfer Override Switch: Overrides automatic retransfer control so that automatic transfer switch shall remain connected to emergency power source regardless of condition of normal source. Pilot light