Bid Packet.pdf

Request for Bid

Hospital Switchgear #2024-02

Release Date: January 12th, 2024

City of Covington 2194 Emory Street

Covington, Georgia 30014

December 22nd, 2023

The City of Covington is accepting bids for Hospital Switchgear. Sealed bids must be received by the Purchasing Department, Attn: Scott Cromer in City Hall by Thursday, February 1st, 2024 at 10:00 AM. Bids will be opened at 10:30 AM

The City of Covington will consider the competency and responsibility of bidders in making the award. City of Covington reserves the right to reject any and all bids, to waive informalities and technicalities, to reject portions of the bids and to award contracts in a manner consistent with the City and laws governing the State of Georgia.

SCOPE

Vendors are invited to submit a bid for the Purchase of Hospital Switchgear as specified in “Exhibit A” for the City of Covington. Please contact Joel Smith, Jsmith@cityofcovington.org for questions regarding the specifications.

Bids are due to the City of Covington Purchasing Department attention Scott Cromer located at 2194 Emory Street NW, Covington, Georgia 30014 by 10:00 AM on Thursday, February 1st, 2024.

Late bids will not be accepted.

Please submit two (2) hard copies & one (1) copy on a USB flash drive to:

City of Covington Purchasing Department

Hospital Switchgear #2024-02

Attention Scott Cromer

2194 Emory Street NW

Covington, Georgia 30014

If using USPS, mail to:

P.O. Box 1527

Covington, GA 30015 mailto:Jsmith@cityofcovington.org

SPECIAL TERMS AND CONDITIONS

I. Submission of Bids

Bids shall be enclosed in sealed envelopes, addressed to the City of Covington Purchasing Department with the name of the bidder, the date and hour of opening. Bids must be received in the Purchasing Department, marked “Hospital Switchgear #2024-02” no later than the date and time (determined by the date/time stamp in the department) set forth in the Invitation to Bid.

It is the sole responsibility of the bidder to ensure that his or her bid reaches the Purchasing Department. Any addenda should be enclosed in the sealed envelopes as well. The bids will be publicly opened and read at the time and place set forth in the Invitation to Bid.

Items offered must meet required specifications and must be of quality, which will adequately serve the use and purpose for which intended. Full identification of each item bid upon, including brand name, model, catalog number, etc. must be furnished to identify exactly what the bidder is offering. The bidder must certify that items to be furnished are new and that the quality has not deteriorated so as to impair its usefulness.

Unsigned bids will not be considered except in cases where bid is enclosed with other documents, which have been signed. The City will determine this.

City of Covington is exempt from federal excise tax and Georgia sales tax with regards to goods and services purchased directly by City of Covington. Suppliers and contractors are responsible for federal excise tax and sales tax, including any taxes for materials incorporated in City construction projects. Suppliers and contractors should contact the State of Georgia Sales Tax Division for additional information. Tax Exemption Certificates will be furnished upon request.

Information submitted by a bidder in the bidding process shall be subject to disclosure after the public opening in accordance with the Georgia Open Records Act. Each page of proprietary information must be identified. Entire bid may not be deemed proprietary.

II. Award

Award will be made to the lowest responsive and responsible bidder. Conditional bids are not acceptable. The quality of articles to be supplied, their conformity with the specifications, their suitability to the requirements of the City, and the delivery terms will be taken into consideration in making the award. The City may make such investigations as it deems necessary to determine the ability of the bidder to perform, and the bidder shall furnish to the City all such information and data for this purpose as the City may request. The City reserves the right to reject any bid if the evidence submitted by, or investigation of such bidder fails to satisfy the City that such bidder is properly qualified to carry out the obligations of the contract. The City reserves the right to reject or accept any or all bids and to waive technicalities, informalities, and minor irregularities in bids received. The Bidder does not have the exclusive right to fill all of the City’s requirements for the goods or services awarded nor will the City be obligated to purchase the estimated annual quantity or any quantity contained in the bid document.

The City reserves the right to make an award as deemed in its best interest, which may include awarding a bid to a single bidder or multiple bidders; or to award the whole bid, only part of the bid, or none of the bid to single or multiple bidders, based on its sole discretion of its best interest. In case of tie bid, the award will be made as follows:

1. The bid will be awarded to the in-City vendor.

2. The bid will be awarded to the in-State vendor.

3. The bid will be awarded to the vendor with the lesser total dollar volume.

5000.03 - LOCAL VENDOR PREFERENCE

It shall be the policy of the City of Covington to give local vendors preference given that the quality, prior performance, availability of service, supplies and materials, delivery schedule and price are equal.

III. Joint Purchasing

The Newton County Shared Cost Initiative is an effort to lower the cost of goods and services purchased by public agencies in Newton County through use of shared resources and economies of scale. Accordingly, public agencies located in Newton County and participating in the shared cost initiative shall be allowed to purchase identical items and services at the same price and upon the same terms and conditions as established in this contract.

Participating agencies include the following: Newton County Board of Commissioners; Newton County Board of Education; Newton County Water and Sewerage Authority; the City of Covington; City of Oxford; City of Porterdale; Town of Mansfield; and Town of Newborn.

EXHIBIT “A”

SPECIFICATIONS

1. Scope

1.1. This specification applies to three-phase, four-way (2 source, 2 tap), 60 Hz, fully dead front, self-contained automatic source transfer switchgear; with a main bus rating of 600 amperes continuous current and tap rating of 600 amperes. Unit is to be of oil insulated design, utilizing vacuum fault interrupters as a switching and interrupting means.

1.2. The unit is to be insulated with mineral oil for operation to minus 30 degrees C dielectric, contained in a sealed tank design, so operation is unimpaired by flood conditions or contaminated environments (except control). The unit shall utilize vacuum interrupters for all current switching and fault current interruption such that the dielectric media is not consumed or contaminated by normal operations of the interrupters.

The unit shall be designed for installation on a concrete or fiberglass pad at ground level.

1.3. The transfer control shall be iST 921/901 microprocessor based programmable source transfer relay which will allow for event recording, adjustable time delays, and overcurrent protection.

1.4. The switchgear shall use resettable vacuum interrupters with microprocessor-based controls for overcurrent and fault circuit protection fuses shall not be used for protection of the taps.

1.5. This specification shall only cover the purchase and shipment of switchgear. The purchaser and/or user shall be responsible for all site-work, electrical connections, programming, and installation.

2. Applicable Standards

2.1. IEEE Std C57.12.28™-2005 standard – Standard for Pad-Mounted Equipment - Enclosure Integrity

2.2. IEEE Std C57.12.29™-2005 standard

2.3. IEEE Std 386™-2006 standard – Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600 V

2.4. IEEE Std C37.90™-2005 standard – IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus

2.5. IEEE Std C37.90.2™-2004 standard – Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers

1) Construction

3. The top terminal connection shall include a connection/disconnection ring through which the recloser can be swung open and hung by the trunnion for a visual disconnect. The top terminal pad would serve as a line (source side) cable connection while the bottom terminal Ratings

The switchgear shall be rated* as follows:

Nominal Voltage Class, kV 15 25 35

Maximum Design Voltage, kV 15.5 27 38

BIL, kV 95 125 150

1-Minute Withstand (60 Hz) Interrupter and Terminators, kV

35 40 50

Continuous Current (max.) A 600 600 600

Interrupting Current (sym/asym) kA 12/20 12/20 12/20

Momentary Current 10 cycles (asym.) kA 12/20 12/20 12/20

1 second. (sym.), kA 12 12 12

Making Current (sym.), kA 12 12 12

Transformer Magnetizing Interrupting Current, A 21 21 21

Cable Charging Interrupting Current,A 15 15 20

Capacitive, A 10 25 40

* Continuous and short-circuit currents may be limited by ratings of selected bushings.

Minimum Full Life Fault Interrupting Duty Cycle

Percent of Interrupting Current Rating Number of Operations

15-20 88

45-55 112

90-100 32

Total 232

3.1. The switchgear shall have an ambient operating temperature range of -30 ºC to +40 ºC.

3.2. Construction

3.2.1. The underground distribution switchgear shall consist of a 2-sided, sealed tank, and with separate front and rear cable compartments. Overall height, width, depth, and layout shall conform to the manufacturer’s standard construction practices for the configuration, ratings, and voltage class specified. Standard construction shall be of mild steel with stainless steel hardware.

3.2.2. The liquid filled unit shall have a tamperproof bolted tank cover design, utilizing Buna-N rubber gaskets. The sealed tank (with deadfront terminators installed) shall be capable of withstanding flood immersion while energized, and shall be impervious to contaminants and animals, so as not to compromise the main insulation structure. The main and tap cable compartments shall be located at the front and back of the tank, respectively. The main cable compartments shall house source bushings, source switches and transfer control. The tap compartment shall house tap bushings.

Recessed lifting provisions for suitable balanced lift shall be provided on the tank ends.

3.2.3. The source compartment shall have a minimum depth of 30". The tap compartment shall have a minimum depth of 16" to provide ease of cable installation and allow for the addition of termination accessories.

3.2.4. -hinged cabinet style doors shall be provided. The side-hinged doors shall provide three-point latching and shall not require a center support post. Side-hinged doors shall have a door stay to manually latch the door in the open position at approximately 120º from the closed position. The right-hand door on each side shall be the first opening door and shall be secured with a recessed stainless steel pentahead bolt, with provisions for padlocking. The cabinets shall be equipped with a hinged cabinet top to facilitate entry to the cable compartments; it Side shall open approximately 60 degrees and have door stays to hold it in the open position. The cabinet top when in the closed position shall interlock with the cabinet doors without additional means required to secure it.

Cabinet construction shall meet all NEMA and ANSI security requirements as defined in the IEEE Std C57.12.28™-2005 standard and the construction requirements of the IEEE Std C37.74™-2003 standard.

3.2.5. Units shall be shipped complete with the specified liquid insulation, and relay installed.

• The unit shall be equipped with a drain valve with 3/8” sampler. A single automatic pressure relief valve shall be supplied that is hotstick-operable and located on the source-side front plate above the oil level indicator within the switchgear. The unit shall have sight gages to monitor the dielectric level located on each unit side equipped with an operating handle.

3.2.6. A 1/2-13 UNC stainless steel ground nut shall be provided that is welded to the switchgear tank and mounted beneath each bushing.

3.2.7. A non-corrosive operating diagram (one-line schematic of the unit) shall be affixed to the inside of the right hand, first opening door, on both sides of the unit, if two (2) sided. A single nameplate shall be provided that is mounted on the source side tank front plate in the upper right-hand corner. The nameplate shall contain the following information:

• Catalog Number/Model Number

• Serial Number

• Nominal voltage class, kV

• Rated maximum voltage, kV

• BIL, kV

• Manufacturing Date: MM/YYYY

• Rated continuous current, A

• Rated load interrupting rating, A

• Momentary current rating, kA asym.

• Close & latch rating, kA asym.

• Total weight, lbs.

• Liquid dielectric volume (gallons)

3.2.8. Three (3) Faulted Circuit Indicator mounting provisions shall be provided in the sills beneath the cabinet doors at the position of each way. The provisions shall include a 1-1/16 diameter hole, cover plate, and tamperproof mounting bolts. There shall be provisions for mounting at least one fault indicator for each equipment bushing.

3.2.9. Operations counter shall be provided on source transfer switches.

3.2.10. Bushings

Bushings shall be deadfront type for use with separable connectors conforming to IEEE Std 386™- 2006 standard and ANSI Standard C119.2. The source ways shall have a continuous current rating of 600 ampere with bushings. Tap ways shall have a continuous current rating of 600 ampere with bushings.

Six hundred (600) ampere bushings shall be horizontally configured at 24 inches above the pad and accept molded, separable deadfront connectors. Bushings shall be mounted with minimum spacing of 8.0-inches between centerlines, except that the between the C-phase bushings which may be a minimum of 5.0-inches between centerlines. A standoff bracket or parking stand shall be supplied for each bushing and shall be mounted horizontally adjacent to each bushing on a 4.0-inch centerline from the bushing centerline. The standard phasing of the bushings from left to right shall follow the sequence ABC-CBA. Each bushing shall have identification affixed to the front plate identifying its source or tap designation, as shown on the one-line operating diagram, and its phase identification.

3.2.11. Source Switches

3.2.11.1. Model 9 Source Switches shall utilize vacuum interruption only, such that the dielectric media is never contaminated by switching arc products. The source switches shall incorporate vacuum fault interrupters that shall provide source switching. Switches shall be three-phase gang-operated vacuum switches. The switches shall incorporate Flux Shift Trippers to initiate tripping, and solenoids to initiate closing of the switches in response to signals from the transfer control. The maximum opening time after issuance of an Open or

Trip signal shall be 2 cycles. The maximum close time after issuance of a Close signal shall be 5.5 cycles. As a safety precaution, the interrupter shall incorporate a trip-free mechanism to prevent the possibility of holding the interrupter closed under a faulted condition. The mechanism and the vacuum interrupters employed shall be capable of interrupting the rated continuous current 600 amperes and fault currents up 12,000 RMS amperes symmetrical.

3.2.11.2. The switches shall incorporate spring-charged operating mechanisms that are motor-driven. Both opening springs and closing springs shall be charged by a 120 Vac motor that shall run automatically after each opening operation. Sufficient energy shall be stored within the springs to allow a manual Close/Open operation upon loss of ac supply voltage.

The springs must be fully charged before the switch can be closed. A manual spring charging handle shall be provided in the event that voltage is not available for motor operation and the springs are in an uncharged state. The manual operating handle for each switch shall be provided on the tank frontplate and shall allow manual trip and manual close of the switch and shall be pad-lockable in the Trip position.

3.2.11.3. A spring Charged/Discharged indicator shall be visible through a viewing port located on the source side tank frontplate.

3.2.12. Model 9 Vacuum Fault Interrupters

3.2.12.1. The switchgear shall incorporate two vacuum fault interrupters (VFI) for tap overcurrent protection. The device shall interrupt all fault currents up to the rated maximum. The VFI shall be manually resettable, with no consumable parts (i.e. fuses). The maximum interrupting time from issuance of a trip signal from the electronic control shall be 2 cycles.

3.2.12.2. To provide maximum safety to the operator, the VFI shall incorporate a trip-free mechanism to prevent the possibility of holding the interrupter closed under a faulted condition. The switchgear shall incorporate two vacuum fault interrupters (VFI) for tap overcurrent protection. The device shall interrupt all fault currents up to the rated maximum. The VFI shall be manually resettable, with no consumable parts (i.e. fuses). The maximum interrupting time from issuance of a trip signal from the electronic control shall be 2 cycles.

3.2.12.3. To provide maximum safety to the operator, the VFI shall incorporate a trip-free mechanism to prevent the possibility of holding the interrupter closed under a faulted condition.

3.2.12.4. The VFI shall act as a three-phase gang operated fault interrupter. The trip mechanisms for each phase shall be mechanically linked and the electronic control shall be set so that an overcurrent condition on any one phase simultaneously trips all three phases. The VFI shall be provided with a single operating handle for manual opening, reset and closing.

The operating handle shall be mounted on the frontplate of the tank in the tap compartment and shall have three distinct operating positions corresponding to whether the vacuum fault interrupter is open, closed, or tripped. A pointer attached to the handle along with a decal shall be provided for ready identification of the handle position. The handle shall be designed for operation with a lineman’s hotstick and have a push to close / pull to open / pull to reset operation requiring no more than 75 lbs. of force at the handle and 60 degrees of movement for complete operation. When the vacuum fault interrupter is tripped the operating handle shall drop to an intermediate position between its closed and open positions, to indicate that it is tripped. The operating handle assembly shall include provisions to padlock the handle in the Open position.

4. iST Relay and Control

4.1. An iST relay shall be provided for the purpose of providing source transfer control of the PST-9 switchgear.

In addition, overcurrent protection and metering shall be provided for the loads. The relay shall be programmable via RS-232 interface with a laptop computer, or programmable via the relay front plate.

4.2. Model-9 Two iST relays shall be used:

• The iST-921 shall provide source transfer control of the two sources, and overcurrent protection and metering for tap 1.

• The iST-901 shall provide overcurrent protection and metering for tap 2 and shall be capable of providing a fault block signal to iST-921 control with over-current pickup.

4.3. Source Transfer operation

4.3.1. Source Transfer operation shall be enabled when the following conditions are true:

• Non-Volatile mode Manual / Automatic is in Automatic

• Fault Block is disabled, or Fault Block is enabled and no OC elements are picked up

4.3.2. The iST shall initiate a transfer from one source to the other source when one or more of the enabled Transfer Parameters asserts (indicating an unhealthy source) and the Alternate Source meets all of the enabled Restoration Parameters (indicating a healthy source).

4.3.3. The operating sequence shall be:

• The switch of the unhealthy source opens.

• If the alternate source is a utility and meets all enabled Source Restoration parameters, closing of the alternate source switch will assert immediately.

4.3.4. If the alternate source is a generator, the Generator Power-up Contact Output will assert. Closing of the alternate source switch will occur when the generator meets all enabled Source Restoration parameters.

4.3.5. In the event of a dual source outage (both sources are unhealthy), a user defined setting shall be available which will allow the user to select whether both switches shall open, or if the current switch state at the time of the outage shall be maintained. If open both is selected, the closed source switch will open. The switch of the first available healthy source shall close.

4.3.6. Restoration of normal power sequence of operation shall be dependent on the user selectable Preferred Source and Restoration Mode settings. The available options shall be:

Preferred Source

Five Preferred Source settings shall be available:

1) Source 1 preferred; normal restoration o Restoration back to source 1 will occur after all enabled restoration parameters are met and the Time Delay has expired. The iST shall remain in automatic mode.

2) Source 1 preferred; hold on alternate o No restoration, Source 2 will remain closed; the iST is switched to manual mode and no further transfers will occur until automatic mode is re-enabled.

3) Source 2 preferred; normal restoration o Restoration back to source 2 will occur after all enabled restoration parameters are met and the Time Delay has expired. The iST shall remain in automatic mode.

4) Source 2 preferred; hold on alternate o No restoration, Source 1 will remain closed; control switched to manual mode and no further transfers will occur until automatic mode is re-enabled.

5) No source preference o Transfer between Sources 1 and 2 will occur when the closed source is unhealthy. The iST shall remain in automatic mode

Restoration Mode

Restoration Mode for Preferred Source options 1, & 3 shall occur in a user defined parallel or non-parallel mode:

1) If non-parallel restoration is selected: the alternate source will open, then the preferred source will close after a customer settable time delay.

2) If parallel restoration is selected: the alternate source will remain closed, the preferred source will close when the user defined sync check parameters are met, then the alternate source will open.

3) Restoration does not occur for Preferred Source options 2, 4, & 5.

4.4. The relay will allow for user programmable Source Transfer Settings

• Five selections for preferred source, described above

• Selection of Alternate Source: Utility or generator

• Fault block: Enable or Disable

• Restoration Mode: Non-parallel or parallel

• Dual-Source Outage: Maintain Closed or Open Both

4.5. User defined Source Health Settings

4.5.1. Transfer parameters – any combination shall be selectable. The source shall be determined to be unhealthy if any of the enabled parameters are met. Each parameter shall have a programmable time delay.

• Two levels of undervoltage: 27-1 & 27-2

• One level of positive sequence undervoltage: 27P

• Two levels of underfrequency: 81U1 & 81U2

• Two levels of overfrequency: 81O1 & 81O2

4.5.2. Restoration parameters– any combination shall be selectable. The source shall be determined to be healthy if all enabled parameters are met. Each parameter shall have a programmable time delay.

• One level of minimum phase-ground voltage: 59

• One level of minimum positive sequence voltage: 59P

• One level of minimum source frequency: 81U

• One level of maximum source frequency: 81O

4.6. User selectable and programmable Sync Check Settings

4.6.1. Sync check shall be active if parallel restoration is selected. The sync check algorithm will compare positive sequence voltage magnitude, angle, frequency, and slip to determine synchronism. The following settings shall be available to provide user programmable tolerances.

• Maximum delta voltage angle

• Maximum delta voltage magnitude

• Minimum time for phasors to meet Maximum delta voltage angle and Maximum delta voltage angle

• Delta frequency limit

• Mechanism closing delay

• Sync. close attempt window which shall be the maximum time in which the iST will attempt a synchronous close. Failure to sync within this time will assert a fail to sync signal.

• An option to allow non-parallel restoration shall be provided if a Failure to Sync occurs during a parallel restoration. The time window to attempt a synchronous close shall be adjustable from 10 to 300 seconds.

4.6.2. In the event the iST is to operate with a standby generator, the following user programmable features shall be included when preferred source option 1 or 3 is selected.

- Generator power up time (Assertion time of the generator power up contact)

- Generator power down time (Assertion time of the generator power down contact)

- Generator standby time (how long to keep the generator running after the preferred source is restored and the switch is closed)

4.6.3. The generator source switch will close after the generator meets all of the enabled Source Restoration parameter settings. One or more of the following elements shall be programmable:

- Minimum Phase-ground voltage

- Minimum positive sequence voltage

- Minimum frequency

- Maximum frequency

4.6.4. Restoration from the generator back to the preferred source shall be made after the preferred source meets all of the enabled Source Restoration parameters. The user shall have the option for restoration to be parallel with sync check or non-parallel.

- Non- Parallel restoration sequence: After the preferred source is “healthy”, the generator switch opens, then the preferred source switch closes after a customer programmable time delay.

- Parallel restoration sequence: The preferred source switch will close when it is in sync with the generator, then the generator source switch will open.

4.6.5. The generator power down contact will close after the user defined generator standby timer expires

4.7. Manual / Automatic Non-Volatile Mode

• When the relay is set in Automatic Mode Source Transfer operation is enabled. All front panel and SCADA switching of sources shall be blocked.

• When the relay is set in Manual Mode, Source Transfer operation shall be disabled. Front panel and SCADA operation of the source switches shall be enabled.

Manual mode operation shall be supervised by the User-defined Restoration Mode settings such that; when restoration mode is set to Non-parallel Mode, only one source may be closed. If one source is closed, manual closing of the second source is blocked.

When restoration mode is set to Parallel Mode, if one source is closed, manual closing of the second source is permitted, supervised by the sync check algorithm and settings as described above.

• When the source transfer mode is switched from Manual to Automatic Mode, the iST shall configure the sources per the Preferred Source and Restoration Mode settings. (example: if Automatic Mode is enabled with Source 2 closed and the Preferred Source setting is Source 1, the iST will initiate restoration to Source 1 if it is healthy.)

4.8. Fault Block settings – Model-9 with iST-921 and iST-901

4.8.1. The relay will be provided with a fault block feature which will operate in such a manner that:

4.8.2. If Fault Block is disabled, source transfer operation remains in automatic mode, regardless of the status of the OC elements.

4.8.3. If Fault Block is enabled, source transfer operations are blocked while an internal OC element is picked up or the OC pickup contact input from the iST-901 is closed.

• For a temporary fault that does not result in an OC trip, automatic operations are unblocked when the OC element drops out.

• For a fault on feeder #1 that results in an OC trip, the iST-921 will issue a trip command to feeder #1. Automatic operations are unblocked when the OC element drops out.

• For a fault on feeder #2, the iST-901 will trip feeder #2. The fault block contact output will open when the fault is cleared. Automatic operations of the iST-921 are unblocked when the CO opens.

4.9. Overcurrent controls

4.9.1. The relay shall be provided with tap overcurrent protection which is user programmable and shall include:

• Individual Settings for phase and ground overcurrent and fault protection

• The relay shall be supplied with the following user selectable TCC curves:

o IEEE o IEC o Eaton’s Cooper Power series Tri-Phase and TPG curves

EF

TF

K F H o Eaton’s Cooper Power series recloser curves (curves 106-165)

4.10. Cold Load Pickup Settings

4.10.1. The relay shall be provided with tap cold load pickup settings which are user programmable and shall include:

• Individual settings for phase and ground

• Curves:

o IEEE o IEC o Eaton’s Cooper Power series Tri-Phase and TPG curves

EF

TF

K F H o Eaton’s Cooper Power series recloser curves (curves 106-165)

4.11. Additional Features:

Sequence of Event recorder with capacity to store the most recent 250 events in non-volatile memory.

Oscillography for fault analysis. The oscillography shall be 20 cycles long with capacity for storing the most recent 10 events.

Programmable Data Profiler to record any combination of the available metering data.

Metering – instantaneous current, voltage, power factor, power, energy, demand, and harmonics

(requires PTs, available liquid insulated only) Available communications protocols shall include DNP3 via serial and TCP/IP, and Modbus via serial.

Graphical programming environment for custom logic and communication point maps.

Virtual Test Set for testing relay settings without the need for an external test set.

Twenty-five front panel LED target to indicate relay status.

4.12. Overcurrent sensing shall be accomplished with an electronic trip control that shall be Eaton’s Cooper Power series iST control.

4.13. The control shall use internally mounted 1000:1 bushing current transformers (CTs) to sense line current and be powered from the B phase of the internally mounted voltage sensing PTs. The control shall be self-contained and includes the following:

4.13.1. No minimum load requirement shall be necessary to meet the specified time-current characteristics.

4.13.2. The control shall have a minimum operating temperature range of -30 ºC with no more than a ±5% variation in time-current response characteristics from its response at +25 ºC.

4.14. The standard control shall provide minimum phase overcurrent trip settings that are field programmable from 25 amps to 600 amps. Trip settings may be changed while the switchgear is energized (so service is not interrupted

4.15. The control shall provide ganged tripping of the vacuum fault interrupters on each phase of the protected tap. This shall be a standard feature and shall be selectable via a switch located on the control circuit board.

4.16. The control and its enclosure shall be mounted on the inside of the cabinet door of the source compartment. The control enclosures shall be mild steel and vented in design to prevent trapping of moisture within the control. The control enclosures shall have internal thermostatically controlled 120 Vac heaters to prevent condensation in the enclosure.

4.17. The ground trip sensing portion of the control shall be capable of being de-activated

4.18. The control shall provide fuse protection on all potential inputs. The fuses shall be easily removable, to simulate a loss of phase during testing, and shall provide easy visual identification if the fuse is blown.

4.19. The source transfer control shall be mounted within the source side cable entrance compartment on the cabinet door.

5. Finish Performance Requirements

5.1. Unless otherwise specified, the switchgear shall be constructed of mild steel with stainless steel details and painted green conforming to Munsell 7GY 3.29/1.5. The coating system employed shall meet or exceed IEEE Std C57.12.28™-2005 standard coating system requirements for underground distribution equipment, including the following performance tests:

• 1500-hour 5% salt spray corrosion test per ASTM B117 / D1654

• 1000-hour humidity test per ASTM D2247 / D1654

• 500-hour ultraviolet accelerated weathering test per ASTM G53 / D523

• Direct impact test with 160 in. lb. falling dart per ASTM D2794

• Tabor abrasion test 3,000 cycles per ASTM D4060

• Crosshatch adhesion per ASTM D3359

6. Certified Design Test Data

Certified design test data shall be furnished upon request. The test data shall bear the seal of a Registered Professional Engineer and shall be available for the following:

6.1. Coatings per IEEE Std C57.12.28™-2005.

7. Production Testing –

The unit shall be subjected to the following production tests:

7.1. Continuity test to assure correct internal connections.

7.2. Hi-pot test to determine dielectric strength of the unit.

7.3. Pressure test to assure tank is completely sealed.

7.4. Electrical TCC trip test.

8. Submittals

8.1. The manufacturer shall furnish a detailed list of ratings and accessories and set of drawings defined as follows:

• Detailed front elevation

• Single Line

• Base Plan

• Schematics

8.2. The manufacturer shall furnish instruction manuals covering the installation of the switchgear and the operation of its various components.

9. Quality Assurance

9.1. The manufacturer shall be a company specializing in medium voltage underground distribution switchgear with at least fifteen years of documented experience.

9.2. Equipment shall be built in accordance with the industry standards for medium voltage equipment.

9.3. The manufacturer shall be registered and certified as ISO 9001 compliant by a recognized international and independent body.

10. Warranty

The underground distribution switchgear shall be provided with a one-year warranty in-service/18 months maximum from date of shipment.

11. Approved Manufacturers

Eaton

BID FORM

Hospital Switchgear

BID AMOUNT EACH $______________________

ESTIMATED DELIVERY DATE __________________________________________

DEALER / VENDOR NAME ___________________________________________

BIDDER NAME ___________________________________________________

PHONE_______________________ EMAIL _____________________________

SIGNATURE __________________________________ DATE____________