263623 Automatic Transfer Switches seismic.pdf

UPGRADE EMERGENCY POWER IN BUILDING 138

VAMC, MARION, IN PROJECT: 610-16-104

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SECTION 26 36 23

AUTOMATIC TRANSFER SWITCHES

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installat ion, connection, and testing of open-transition automatic transfer switc hes with bypass isolation, indicated as automatic transfer switches or ATS in this section.

1.2 RELATED WORK

A. Section 03 30 00, CAST-IN-PLACE CONCRETE: Requi rements for concrete equipment pads.

B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL

COMPONENTS: Requirement for seismic restraint for n onstructural components.

C. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL IN STALLATIONS:

Requirements that apply to all sections of Division 26.

D. Section 26 05 19, LOW-VOLTAGE ELECTRICAL POWER C ONDUCTORS AND CABLES:

Low-voltage conductors.

E. Section 26 05 26, GROUNDING AND BONDING FOR ELEC TRICAL SYSTEMS:

Requirements for personal safety and to provide a l ow impedance path for possible ground fault currents.

F. Section 26 05 33, RACEWAYS AND BOXES FOR ELECTRI CAL SYSTEMS: Conduits.

G. Section 26 05 73, OVERCURRENT PROTECTIVE DEVICE COORDINATION STUDY:

Short circuit and coordination study, and requireme nts for a coordinated electrical system.

H. Section 26 32 13, ENGINE-GENERATORS: Requirement s for normal and emergency power generation.

I. SECTION 27 15 00, COMMUNICATIONS HORIZONTAL CABL ING: Communications media for interconnecting automatic transfer switch es and remote control and annunciation components.

1.3 QUALITY ASSURANCE

A. Quality Assurance shall be in accordance with Pa ragraph, QUALIFICATIONS

(PRODUCTS AND SERVICES) in Section 26 05 11, REQUIR EMENTS FOR

ELECTRICAL INSTALLATIONS.

B. A factory-authorized representative shall be cap able of providing emergency maintenance and repairs at the project si te within 4 hours maximum of notification.

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C. Automatic transfer switch, bypass/isolation swit ch, and annunciation control panels shall be products of the same manufa cturer.

1.4 FACTORY TESTS

A. ATS shall be thoroughly tested at the factory to assure that there are no electrical or mechanical defects.

B. Factory Tests shall be in accordance with Paragr aph, MANUFACTURED

PRODUCTS in Section 26 05 11, REQUIREMENTS FOR ELEC TRICAL

INSTALLATIONS, and the following requirements:

1. Perform visual inspection to verify that each AT S is as specified.

2. Perform mechanical test to verify that ATS secti ons are free of mechanical defects.

3. Perform insulation resistance test to ensure ele ctrical integrity and continuity of entire system.

4. Perform main switch contact resistance test.

5. Perform electrical tests to verify complete syst em electrical operation.

1.5 SUBMITTALS

A. Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:

1. Shop Drawings:

a. Submit sufficient information to demonstrate com pliance with drawings and specifications.

b. Include voltage rating, continuous current ratin g, number of phases, withstand and closing rating, dimensions, weights, mounting details, conduit entry provisions, front v iew, side view, equipment and device arrangement, elementary and interconnection wiring diagrams, factory relay sett ings, and accessories.

c. For automatic transfer switches that are network ed together to a common means of annunciation and/or control, submit interconnection diagrams as well as site and buildi ng plans, showing connections for normal and emergency source s of power, load, control and annunciation components, and inte rconnecting communications paths. Equipment locations on the di agrams and plans shall match the site, building, and room desi gnations on the drawings.

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d. Complete nameplate data, including manufacturer' s name and catalog number.

e. A copy of the markings that are to appear on the automatic transfer switches when installed.

f. Certification from the manufacturer that represe ntative ATS have been seismically tested to International Building C ode requirements. Certification shall be based upon si mulated seismic forces on a shake table or by analytical me thods, but not by experience data or other methods.

2. Manuals:

a. Submit, simultaneously with the shop drawings, c ompanion copies of complete maintenance and operating manuals, incl uding technical data sheets, wiring diagrams, and informa tion for ordering replacement parts.

1) Schematic signal and control diagrams, with all terminals identified, matching terminal identification in the automatic transfer switches.

2) Include information for testing, repair, trouble shooting, assembly, disassembly, and factory recommended/requ ired periodic maintenance procedures and frequency.

3) Provide a replacement and spare parts list. Inc lude a list of tools and instruments for testing and maintenance p urposes.

b. If changes have been made to the maintenance and operating manuals originally submitted, submit updated mainte nance and operating manuals two weeks prior to the final insp ection.

1) Include complete "As Installed" diagrams that in dicate all pieces of equipment and their interconnecting wirin g.

2) Include complete diagrams of the internal wiring for each piece of equipment, including "As Installed" revisi ons of the diagrams.

3) The wiring diagrams shall identify the terminals to facilitate installation, maintenance, operation, and testing.

3. Certifications:

a. When submitting the shop drawings, submit a cert ified test report from a recognized independent testing laboratory th at a representative sample has passed UL 1008 prototype testing.

b. Two weeks prior to final inspection, submit the following.

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1) Certification by the manufacturer that the ATS c onform to the requirements of the drawings and specifications.

2) Certification by the Contractor that transfer sw itches have been properly installed, adjusted, and tested.

1.6 APPLICABLE PUBLICATIONS

A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specif ication to the extent referenced. Publications are referenced in t he text by designation only.

B. Institute of Electrical and Electronic Engineers (IEEE):

446-95..................Emergency and Standby Power Systems for

Industrial and Commercial Applications

C37.90.1-12.............Surge Withstand Capability (SWC) Tests for

Relays and Relay Systems Associated with

Electric Power Apparatus

C62.41.1-02.............Guide on the Surges Environ ment in Low-Voltage

(1000 V and Less) AC Power Circuits

C62.41.2-02.............Recommended Practice on Cha racterization of

Surges in Low-Voltage (1000 V and Less) AC

Power Circuits

C. International Code Council (ICC):

IBC-15..................International Building Code

D. National Electrical Manufacturers Association (N EMA):

250-14..................Enclosures for Electrical E quipment (1000 Volts

Maximum)

ICS 6-06................Enclosures

ICS 4-15................Application Guideline for T erminal Blocks

MG 1-16.................Motors and Generators

E. National Fire Protection Association (NFPA):

70–17...................National Electrical Code (N EC)

99-15...................Health Care Facilities

110-16..................Emergency and Standby Power Systems

F. Underwriters Laboratories, Inc. (UL):

50-15...................Enclosures for Electrical E quipment

508-99..................Industrial Control Equipmen t

891-05..................Switchboards

1008-14.................Transfer Switch Equipment

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PART 2 - PRODUCTS

2.1 GENERAL REQUIREMENTS

A. Automatic transfer switches shall comply with IE EE, NEMA, NFPA, UL, and have the following features:

1. Automatic transfer switches shall be open transi tion switches, 3-pole solid neutral, draw-out construction, electric ally operated, mechanically held open contact type, without integr al overcurrent protection. Automatic transfer switches utilizing a utomatic or non-automatic molded case circuit breakers, insulated c ase circuit breakers, or power circuit breakers as switching me chanisms are not acceptable.

2. Automatic transfer switches shall be completely factory-assembled and wired such that only external circuit connectio ns are required in the field.

3. Each automatic transfer switch shall be equipped with an integral bypass/isolation switch.

4. Ratings:

a. Phases, voltage, continuous current, poles, and withstand and closing ratings shall be as shown on the drawings.

b. Transfer switches shall be rated for continuous duty at specified continuous current rating on 60Hz systems.

c. Maximum automatic transfer switch rating: 800 A.

5. Markings:

a. Markings shall be in accordance with UL 1008.

6. Tests:

a. Automatic transfer switches shall be tested in a ccordance with UL

1008. The contacts of the transfer switch shall not weld during the performance of withstand and closing tests when used with the upstream overcurrent device and available fault cur rent specified.

7. Surge Withstand Test:

a. Automatic transfer switches utilizing solid-stat e devices in sensing, relaying, operating, or communication equi pment or circuits shall comply with IEEE C37.90.1.

8. Housing:

a. Enclose automatic transfer switches in wall- or floor-mounted steel cabinets, with metal gauge not less than No. 14, in

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26 36 23 - 6 accordance with UL 508, or in a switchboard assembl y 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 during a utomatic transfer switch maintenance.

c. Automatic transfer switch components shall be re movable without disconnecting external source or load power conduct ors.

d. Finish: Cabinets shall be given a phosphate trea tment, painted with rust-inhibiting primer, and finish-painted wit h the manufacturer's standard enamel or lacquer finish.

e. Viewing Ports: Provide viewing ports so that con tacts may be inspected without disassembly.

9. Operating Mechanism:

a. Actuated by an electrical operator.

b. Electrically and mechanically interlocked so tha t the main contact cannot be closed simultaneously in either n ormal and emergency position.

c. Normal and emergency main contacts shall be mech anically locked in position by the operating linkage upon completio n of transfer.

Release of the locking mechanism shall be possible only by normal operating action.

d. Contact transfer time shall not exceed six cycle s.

e. Operating mechanism components and mechanical in terlocks shall be insulated or grounded.

10. Contacts:

a. Main contacts: Silver alloy.

b. Current carrying capacity of arcing contacts sha ll not be used in the determination of the automatic transfer switch rating, and shall be separate from the main contacts.

c. Main and arcing contacts shall be visible for in spection with cabinet door open and barrier covers removed.

11. Manual Operator:

a. Capable of operation by one person in either dir ection under no load.

12. Replaceable Parts:

a. Include the main and arcing contacts individuall y or as units, as well as relays, and control devices.

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b. Automatic transfer switch contacts and accessori es shall be replaceable from the front without removing the swi tch from the cabinet and without removing main conductors.

13. Sensing Features:

a. Undervoltage Sensing for Each Phase of Normal So urce: Sense low phase-to-ground voltage on each phase. Pickup volta ge 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-s ource voltage sensing to delay transfer and engine start signals. Adjustable from zero to six seconds, and factory set for one s econd.

c. Voltage/Frequency Lockout Relay: Prevent premat ure transfer to the engine-generator. Pickup voltage shall be adjus table from 85 to 100% of nominal. Factory set for pickup at 90%. Pickup frequency shall be adjustable from 90 to 100% of no minal. Factory set for pickup at 95%.

d. Time Delay for Retransfer to Normal Source: Adj ustable from 0 to

30 minutes, and factory set for 10 minutes to autom atically defeat delay on loss of voltage or sustained underv oltage of emergency source, provided normal supply has been r estored.

e. Test Switch: Simulate normal-source failure.

f. Switch-Position Indication: Indicate source to which load is connected.

g. Source-Available Indication: Supervise sources via transfer switch normal- and emergency-source sensing circuit s.

h. Normal Power Indication: Indicate "Normal Sour ce Available."

i. Emergency Power Indication: Indicate "Emergency Source

Available."

j. Transfer Override Control: Overrides automatic retransfer control so that automatic transfer switch shall rem ain connected to emergency power source regardless of condition o f normal source. Control panel shall indicate override statu s.

k. Engine Starting Contacts: One isolated and norm ally closed and one isolated and normally open; rated 5 A at 30 V D C minimum.

l. Engine Shutdown Contacts: Time delay adjustable from zero to 15 minutes, and factory set for 5 minutes. Contacts sh all initiate

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26 36 23 - 8 shutdown at remote engine-generator controls after retransfer of load to normal source.

m. Engine-Generator Exerciser: Programmable exercis er starts engine-generator(s) and transfers load to them from normal source for a preset time, then retransfers and shuts down engine -generator(s) after a preset cool-down period. Initiates exercise cycle at preset intervals adjustable from 7 to 30 days. Runn ing periods are adjustable from 10 to 30 minutes. Factory setti ngs shall be for 7-day exercise cycle, 20-minute running period, and 5-minute cool-down period.

14. Controls:

a. Controls shall provide indication of switch stat us and be equipped with alarm diagnostics.

b. Controls shall control operation of the automati c transfer switches.

15. Factory Wiring: Train and bundle factory wiring and label either by color-code or by numbered/lettered wire markers. La bels shall match those on the shop drawings.

16. Annunciation, Control, and Programming Interfac e Components:

Devices for communicating with remote programming d evices, annunciators, or control panels shall have open-pr otocol communication capability matched with remote device .

17. Provide contacts for connection to elevator con trollers, one closed when automatic transfer switch is connected to the normal source, and one closed when automatic transfer switch is co nnected to the emergency source.

18. Elevator Pre-Transfer Signal Relay: Provide a p re-signal relay on all automatic transfer switches that shall indicate to an elevator controller or controllers that a transfer or re-tra nsfer is about to occur.

2.2 SEQUENCE OF OPERATION

A. The specified voltage decrease in one or more ph ases of the normal power source shall initiate the transfer sequence. The automatic transfer switch shall start the engine-generator(s) after a specified time delay to permit override of momentary dips in the normal power source.

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B. The automatic transfer switch shall transfer the load from normal to emergency source when the frequency and voltage of the engine-generator(s) have attained the specified percent of rated value.

C. Engine Start: A voltage decrease, at any automat ic transfer switch, in one or more phases of the normal power source to le ss than the specified value of normal shall start the engine-ge nerator(s) after a specified time delay.

D. Transfer to Emergency System Loads: Automatic tr ansfer switches for

Emergency System loads shall transfer their loads f rom normal to emergency source when frequency and voltage of the engine-generator(s) have attained the specified percent of rated value. Only those switches with deficient normal source voltage shall transfer .

E. Transfer to Equipment Branch Loads: Automatic tr ansfer switches for

Equipment Branch loads shall transfer their loads t o the engine-generator on a time-delayed, staggered basis, after the Emergency

System switches have transferred. Only those switch es with deficient normal source voltage shall transfer.

F. Retransfer to Normal (All Loads): Automatic tran sfer switches shall retransfer the load from emergency to normal source upon restoration of normal supply in all phases to the specified percen t or more of normal voltage, and after a specified time delay. Should t he emergency source fail during this time, the automatic transfer switc hes shall immediately transfer to the normal source whenever it becomes available. After restoring to normal source, the en gine-generator(s) shall continue to run unloaded for a specified inte rval before shut-down.

2.3 BYPASS-ISOLATION SWITCH

A. Provide each automatic transfer switch with two- way bypass-isolation manual type switch. The bypass-isolation switch sha ll permit load by-pass to either normal or emergency power source and complete isolation of the automatic transfer switch, independent of tr ansfer switch position. Bypass and isolation shall be possible un der all conditions including when the automatic transfer switch is rem oved from service.

B. Operation: The bypass-isolation switch shall hav e provisions for operation by one person through the movement of a m aximum of two handles at a common dead front panel in no more tha n 15 seconds.

Provide a lock, which shall energize to unlock the bypass switch, to

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26 36 23 - 10 prevent bypassing to a dead source. Provide means t o prevent simultaneous connection between normal and emergenc y sources.

1. Bypass to normal (or emergency): Operation of by pass handle shall allow direct connection of the load to the normal ( or emergency) source, without load interruption or by using a bre ak-before-make design, or provide separate load interrupter contac ts to momentarily interrupt the load.

a. Ensure continuity of auxiliary circuits necessar y for proper operation of the system.

b. A red indicating lamp shall light when the autom atic transfer switch is bypassed.

c. Bypassing source to source: If the power source is lost while in the bypass position, bypass to the alternate source shall be achievable without re-energization of the automatic transfer switch service and load connections.

2. Isolation: Operation of the isolating handle sha ll isolate all live power conductors to the automatic transfer switch w ithout interruption of the load.

a. Interlocking: Provide interlocking as part of th e bypass-isolation switch to eliminate personnel-controlled sequence of operation, and to prevent operation to the isolatio n position until the bypass function has been completed.

b. Padlocking: Include provisions to padlock the is olating handle in the isolated position.

c. Visual verification: The isolation blades shall be visible in the isolated position.

3. Testing: It shall be possible to test (normal el ectrical operation) the automatic transfer switch and engine–generator( s) with the isolation contacts closed and the load bypassed wit hout interruption of power to the load.

C. Ratings: The electrical capabilities and ratings of the bypass-isolation switch shall be compatible with those of the associated automatic transfer switch, including any required a dditional withstand tests.

2.4 REMOTE ANNUNCIATOR SYSTEM

(Provide if the Energy Management System [EMCS] is deducted from the bid) A. Remote annunciator panel shall annunciate condit ions for indicated automatic transfer switches. Annunciation shall inc lude the following:

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1. Sources available, as defined by actual pickup a nd dropout settings of automatic transfer switch controls.

2. Switch position.

3. Switch in test mode.

4. Failure of communication link.

B. Remote annunciator panel shall be visual and aud ible type with LED display panel, audible signal, and silencing switch .

1. Panel shall indicate each automatic transfer swi tch monitored, the location of automatic transfer switch, and the iden tity of load it serves.

2. Mounting: Steel cabinet, flush or surface mounte d, as shown on the drawings.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install automatic transfer switches and associat ed remote components in accordance with the NEC, as shown on the drawings, and manufacturer’s instructions.

B. Anchor automatic transfer switches with rustproo f bolts, nuts, and washers not less than 12 mm (1/2 inch) diameter, in accordance with manufacturer’s instructions, and as shown on drawin gs.

C. In seismic areas, automatic transfer switches sh all be adequately anchored and braced per details on structural contr act drawings to withstand the seismic forces at the location where installed.

D. Mount automatic transfer switches on concrete sl ab. Unless otherwise indicated, the slab shall be at least 100 mm (4 inc hes) thick. The top of the concrete slab shall be approximately 100 mm (4 inches) above finished floor. Edges above floor shall have 12.5 m m (1/2 inch) chamfer. The slab shall be of adequate size to proj ect at least 100 mm

(8 inches) beyond the equipment. Provide conduit tu rnups and cable entrance space required by the equipment to be moun ted. Seal voids around conduit openings in slab with water- and oil -resistant caulking or sealant. Cut off and bush conduits 75 mm (3 inch es) above slab surface. Concrete work shall be as specified in Sec tion 03 30 00, CAST-

IN-PLACE CONCRETE.

3.2 ACCEPTANCE CHECKS AND TESTS

A. An authorized representative of the automatic tr ansfer switch manufacturer shall technically supervise and partic ipate during all of the field adjustments and tests. Major adjustments and field tests

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26 36 23 - 12 shall be witnessed by the COR. The manufacturer’s representative shall certify in writing that the equipment has been inst alled, adjusted and tested in accordance with the manufacturer’s recomm endations.

B. Perform manufacturer’s required field tests in a ccordance with the manufacturer's recommendations. In addition, inclu de the following:

1. Visual Inspection and Tests:

a. Compare equipment nameplate data with specificat ions and approved shop drawings.

b. Inspect physical, electrical, and mechanical con dition.

c. Confirm correct application of manufacturer's re commended lubricants.

d. Verify appropriate anchorage, required area clea rances, and correct alignment.

e. Verify tightness of accessible bolted electrical connections by calibrated torque-wrench method, or performing ther mographic survey after energization.

f. Verify grounding connections.

g. Verify ratings of sensors.

h. Vacuum-clean enclosure interior. Clean enclosur e exterior.

i. Exercise all active components.

j. Verify that manual transfer warning signs are pr operly placed.

k. Verify the correct operation of all sensing devi ces, alarms, and indicating devices.

2. Electrical tests:

a. Perform insulation-resistance tests.

b. After energizing circuits, demonstrate the inter locking sequence and operational function for each automatic transfe r switch at least three times.

1) Test bypass-isolation unit functional modes and related automatic transfer switch operations.

2) Power failure of normal source shall be simulate d by opening upstream protective device. This test shall be perf ormed a minimum of five times.

3) Power failure of emergency source with normal so urce available shall be simulated by opening upstream protective d evice for emergency source. This test shall be performed a mi nimum of five times.

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4) Low phase-to-ground voltage shall be simulated f or each phase of normal source.

5) Operation and settings shall be verified for spe cified automatic transfer switch operational feature, such as override time delay, transfer time delay, return ti me delay, engine shutdown time delay, exerciser, auxiliary co ntacts, and supplemental features.

6) Verify pickup and dropout voltages by data reado ut or inspection of control settings.

7) Verify that bypass and isolation functions perfo rm correctly, including the physical removal of the automatic tra nsfer switch while in bypass mode.

c. When any defects are detected, correct the defec ts and repeat the tests as requested by the COR at no additional cost to the

Government.

3.3 FIELD SETTINGS VERIFICATION

A. The automatic transfer switch settings shall be verified in the field by an authorized representative of the manufacturer .

3.4 FOLLOW-UP VERIFICATION

A. Upon completion of acceptance checks and tests, the Contractor shall show by demonstration in service that the automatic transfer switches are in good operating condition and properly perfor ming the intended function.

3.5 INSTRUCTION

A. Furnish the services of a factory-trained techni cian for one 4-hour training period for instructing personnel in the ma intenance and operation of the automatic transfer switches, on th e dates requested by the COR.

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