SCO-16-14441-02G-Addendum#2.pdf

UTILITY TECHNOLOGY

Engineers-Consultants, PLLC

ADDENDUM-2

Date: August 27, 2026 Agency: DNCR - North Carolina Zoological Park Project: New Asia Exhibit (Baboon Holding Area, Zoofari Road Construction, New Service Road, African Pavilion Demolition & New Australia Exhibit)

– Two Standby Generator Systems

State ID# 16-14441-02G (UTEC Project #230801)

To: ALL PRIME BIDDERS OF RECORD This Addendum forms a part of the Contract Documents and modifies the original Project Manual and Construction Documents dated July 28, 2026. This Addendum includes responses to questions received during the bidding period. The questions and answers contained herein shall become part of the Contract Documents and shall be considered in the preparation of the Bid.

Please acknowledge receipt of this Addendum in the space provided on the Bid Form.

Failure to acknowledge receipt of this Addendum may subject the Bidder to disqualification.

Attachments:

1. Medium-voltage Generator Step-up Transformer (Section 16320)

2. Revised Section 16230: (Changes in Paragraph 15.6, Paragraph 15.8, Paragraph 19)

Items:

1. Question and Answer (Questions received through August 25, 2026)

END OF ADDENDUM NUMBER TWO

QUESTIONS AND ANSWERS

1. Is there a site on zoo property where excess dirt may be placed?

Yes, an area on the zoo property is available for placement of excess dirt.

2. Is there a water line going to the north site in the base bid?

Yes, the water line to the north site is included in the base bid. The water line has been shown on the updated Drawing C1N, issued as part of Addendum No. 1.

3. What size and material are the waterlines in the alternate bid?

Waterline pipe shall be provided in accordance with Section 15400 – Plumbing Fixtures and Equipment and the applicable Special Provisions and Contract Drawings.

4. Is there a yard hydrant required at the end of the water line?

Yard hydrants shall be provided where indicated on the Contract Drawings. All waterline and plumbing installations shall comply with Section 15400 – Plumbing Fixtures and Equipment.

5. Is a Backflow preventer required?

Yes, Backflow preventer is required.

6. Is there a specification on the step-up transformer?

Yes. The specification for the step-up transformer is included with Addendum No. 2.

7. Can the electrical contractor submit a bid as the prime contractor for this project?

Yes. An electrical contractor may submit a bid as the prime contractor, provided they meet all requirements outlined in the Project Manual that are required of the General Contractor.

8. Missing S-OA drawing?

The S-OA drawing has been provided as part of Addendum No. 1.

9. Question regarding Bid extension request?

The bid dates have been revised. The updated bid dates were included in Addendum No. 1.

Deadline final questions 09/03/2026

Final Addendum Issue 09/10/2026

Bid Opening 09/17/2026

10. During the pre-bid meeting, it was stated there were no minority participation requirements for this project. Please verify whether bidders are still required to complete and submit the MBE documentation included in the solicitation package. (Affidavit A and B)?

No. There are no MBE participation requirements for this project, and bidders are not required to complete or submit the MBE Affidavit A or Affidavit B included in the solicitation package.

11. Please provide a bid item or unit price schedule for rock excavation and rock blasting. If unit pricing is not currently included in the bid documents, please advise how these items should be addressed in our bid submission should unforeseen rock conditions be encountered during construction?

Rock excavation is not currently included as a separate unit-price item on the Bid Form. Rock excavation shall be addressed in accordance with Section 02200 – Earthwork and the Contract Documents. If unforeseen rock conditions are encountered, the Contractor shall notify the Owner/Designer prior to proceeding with the work. Any adjustment to the Contract Sum shall be determined in accordance with the Contract provisions for changes in the work.

The adjustment to the contract sum described above will be based on the unit prices added to your bid list below:

(Add this to proposal bid list)

Structure Excavation Rock ____________ (Cubic Yds) Conduit Trenching Rock ____________ (Cubic Yds)

12. Is there a points list for electrical gear integrations?

UTEC will provide the required points list for electrical gear integration.

13. Is there a points list for the generator integrations?

UTEC will provide the required points list for generator integration.

14. What communication protocol will be used to share these points with the BAS system?

The BAS interface shall utilize Modbus protocol through the SEL-3530 RTAC data concentrator. Communication between the RTAC and SEL protective relays shall utilize SEL protocol, communication between the RTAC and the generator controller shall utilize RS- 485/Modbus, and communication between the RTAC and PLC shall utilize Ethernet/Modbus, as specified in Section 16340.

15. Spec 16230, list the approved generator mfg. Could Rehlko (formerly Kohler) be added to this list.

Rehlko will not be considered as an approved manufacturer. They were not able to provide required documentation to verify.

16. Are there still HUB requirements for this project?

No. There are no HUB requirements for this project.

17. Are we responsible for pouring the pad for service station transformers?

Yes, all foundation work is to be accounted for within Bid.

18. Can you post the pre-bid meeting sign in sheet?

The pre-bid meeting sign-in sheet is included in Addendum No. 1.

19. Are the bid forms supplements required to be turned in with the bid?

Yes. All bid form supplements identified in the Instructions to Bidders and required bid submission documents shall be completed and submitted with the bid unless specifically noted otherwise in the contract documents.

20. Bid form supplement is required for the bid submission or can that be submitted once designated the lowest bidder?

The bid form supplement is required as part of the bid submission and must be submitted with the bid package. Submittal after bid opening or after designation as the apparent low bidder is not permitted unless specifically allowed by the Contract Documents.

21. Are we responsible for any sewer lines and tie-ins?

All drainage and sewer work is shown within the civil set, no tie in locations are needed for this project.

22. Is a Neutral Ground Resistor required and is there any spec for it?

Yes. The one-line diagram indicates a Neutral Grounding Resistor (NGR) connected to the

4.16 kV generator neutral, rated 400 A for 10 seconds. The detail spec for 4.16kV generator will be added in section 16230.

23. As a MV unit, Base Bid gen will not have a circuit breaker but rather a terminal box with a

UL Listed protective device. Should specs be updated?

The Base Bid generator will not have a generator-mounted circuit breaker. Generator output protection and isolation will be provided by the 5 kV generator incoming circuit breaker (52G1) in the generator switchgear, as shown on the drawings. Section 16230 will be revised accordingly.

24. Please confirm that the Cam-Lock requirement applies only to the alternate units and not the Base Bid MV generator.

The Cam-Lock connection box requirement in Section 16230, Paragraph 16.3 shall apply to the alternate generator units only. The requirement shall not apply to the Base Bid MV generator.

SECTION 16320 - MEDIUM-VOLTAGE GENERATOR STEP-UP (GSU)

TRANSFORMER

PART 1 – GENERAL

1.01 SUMMARY

Provide factory-assembled, liquid-filled medium-voltage transformers complete with all accessories, controls, cooling equipment, factory testing, shipment, installation support, and field acceptance testing. The base bid will be a single transformer, and the alternate bid will include two transformers.

Generation systems are intended to provide emergency and standby power to zoo facilities during loss of normal utility service. The generation facilities shall not intentionally energize utility distribution facilities outside the project boundaries unless specifically approved by the serving utility. Interconnection, grounding, protection, and transfer schemes shall be coordinated with the serving utility and designed to prevent unintended backfeed conditions.

1.02 APPLICATION

The transformer shall be used as a Generator Step-Up (GSU) transformer for interconnection of on-site generation facilities to a 24.94 kV grounded-wye utility distribution system.

Base Bid The transformer shall connect a 3,750 kVA, 4,160 V generator system to a 24.94 kV/14.4 kV utility distribution system. The transformer shall have a 24.94 kV/14.4 kV grounded-wye primary winding and 4.16 kV delta-connected secondary winding.

Alternate No. 1 North Site: The transformer shall connect a 2,000 kVA, 480 V generator system to a

24.94 kV/14.4 kV utility distribution system.

South Site: The transformer shall connect a 1,500 kVA, 480 V generator system to a

24.94 kV/14.4 kV utility distribution system.

The transformer winding configuration shall be coordinated with the approved utility interconnection requirements, grounding philosophy, fault-current study, and protection scheme.

The selected transformer connection shall not be finalized until the grounding and protection requirements of the serving utility have been verified.

1.03 REFERENCES

Comply with the latest adopted editions of the following standards:

• IEEE C57.12.00, General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers

• IEEE C57.12.10, Requirements for Liquid-Immersed Power Transformers

• IEEE C57.12.70, Terminal Markings and Connections

• IEEE C57.12.90, Test Code for Liquid-Immersed Transformers

• IEEE C57.12.28, Pad-Mounted Equipment Enclosure Integrity

• IEEE C57.91, Guide for Loading Mineral-Oil-Immersed Transformers

• IEEE C57.106, Acceptance and Maintenance of Insulating Fluids

• NFPA 70 (National Electrical Code)

• IEEE C2 (National Electrical Safety Code)

1.04 SUBMITTALS

Provide the following:

• Certified outline and dimensional drawings

• Nameplate data

• Transformer impedance and loss calculations

• Excitation current data

• ANSI/IEEE test reports

• Certified factory routine test reports

• Accessory wiring diagrams

• Foundation loading information

• Operation and maintenance manuals

• Protection and Study Data

• Positive-sequence impedance (Z1)

• Negative-sequence impedance (Z2)

• Zero-sequence impedance (Z0)

• Positive-sequence X/R ratio

• Zero-sequence X/R ratio

• Transformer winding connection diagram

• Grounding method

• Ground-fault current contribution data

• Inrush-current characteristics

• Through-fault withstand data

Prior to release for manufacture, the transformer submittal package shall demonstrate compliance with the following:

• Approved transformer winding configuration.

• Grounding & Protection coordination requirements.

• Ground-fault contribution assumptions.

• Short-circuit study assumptions.

• Generator protection requirements.

Release for manufacture shall not occur until the transformer submittal package has been reviewed and accepted by the Engineer.

The transformer manufacturer shall identify any transformer characteristics that could affect compliance with utility interconnection requirements.

1.05 QUALITY ASSURANCE

The manufacturer shall:

• Have a minimum of ten (10) years of experience manufacturing liquid-filled power transformers.

• Maintain an ISO 9001-certified quality management system.

• Perform routine factory testing in accordance with IEEE C57.12.90.

• Comply with NFPA 70 (National Electrical Code).

• Comply with IEEE C2 (National Electrical Safety Code).

The transformer shall be designed and furnished for operation within a utility-connected generation system.

The transformer winding configuration and grounding arrangement shall be suitable for the intended operating philosophy of the facility, including utility-connected operation and any approved islanded or backfeed operating modes.

The manufacturer shall notify the Engineer of any deviation from specified ratings, impedances, winding configurations, grounding characteristics, cooling characteristics, or protection assumptions that may affect equipment studies, utility coordination, relay settings, or system operation.

Acceptance of transformer submittals by the Engineer does not relieve the manufacturer or supplier of responsibility for compliance with the Contract Documents, applicable standards, utility interconnection requirements, or proper transformer application.

PART 2 – PRODUCTS

2.01 MANUFACTURERS

Approved Manufacturers

• Hitachi Energy (ABB)

• Siemens Energy

• Prolec GE

• Eaton / Cooper Power Systems

• Waukesha

• Virginia Transformer

• ERMCO

• Maddox

• UTB Transformer

• WEG

• Howard Industries

• Sunbelt Transformer

• Approved Equal

General Requirements

• Provide a new factory-assembled, liquid-filled, outdoor medium-voltage power transformer specifically designed for Generator Step-Up (GSU) service.

• The transformer shall be a two-winding design with the high voltage winding connected to the 24.94kV/14.4 kV, three phase, four-wire,60 HZ, grounded-wye utility distribution system.

• The transformer shall be suitable for continuous operation under the environmental and electrical conditions specified herein.

2.02 TRANSFORMER RATINGS

Base Bid One (1) Transformer Rating: 3,750 kVA OA/ONAN Primary Voltage: 24,940 GrdY / 14,400 V Secondary Voltage: 4,160 V Delta

Alternate No. 1 North Site Transformer Rating: 2,000 kVA OA/ONAN Primary Voltage: 24,940 GrdY / 14,400 V Secondary Voltage: 480 V Delta

South Site Transformer Rating: 1,500 kVA OA/ONAN Primary Voltage: 24,940 GrdY / 14,400 V Secondary Voltage: 480 V Delta

For base bid:

Primary Voltage Minimum BIL: 150 kV Secondary Voltage Minimum BIL: 75kV

For Alternate bid:

Primary Voltage Minimum BIL: 150kV Secondary Voltage Minimum BIL: 30kV

Factory-tested impedance shall be:

• Minimum: 5.0%

• Maximum: 5.75%

The specified winding configuration shall be coordinated with serving utility interconnection, grounding, protection, and fault current study requirements.

Any proposed modifications to the specific winding configuration shall be submitted to the Engineer for review and approval prior to manufacturing.

All electrical study data shall be provided with the transformer submittal package.

2.03 WINDINGS AND CORE

• Two-winding construction.

• Copper conductors only.

• Designed specifically for GSU service with bidirectional thermal and mechanical capability.

• Designed to withstand through-fault currents and short-circuit stresses in accordance with applicable IEEE standards.

• Transformer windings shall be designed and constructed in accordance with

IEEE C57.12.00 and IEEE C57.12.10 and shall be suitable for generator step-up service.

When energized from the Secondary side:

The transformer manufacturer shall provide calculated and/or tested transformer energization inrush-current characteristics.

The manufacturer shall provide sufficient information to permit proper application and coordination of protective relays associated with transformer energization and system restoration.

Certified inrush-current data shall be included with the transformer submittal package.

Manufacturers shall provide certified calculations and test data verifying compliance.

2.04 INSULATING FLUID

Preferred fluid:

• Silicone insulating liquid

• FM Approved

• UL Classified less-flammable insulating fluid

Minimum properties:

• Fire Point: 300°C minimum

• Dielectric Strength: 35 kV minimum

Transformers shall be factory-filled and sealed.

2.05 BUSHINGS

High-Voltage Bushings

• Dead-front or live-front configuration as indicated on drawings

• 24.9 GrdY / 14.4 kV winding requires

• H1, H2, and H3 insulated bushings

• Fully insulated H0 neutral bushing

Low-Voltage Bushings

• 4.16kV winding requires 75kV BIL

• 480V winding requires 30kV BIL

• Fully insulated X1, X2, and X3 terminals

Bushings shall be designed, rated, and tested in accordance with applicable IEEE standards and shall be suitable for the system voltages and BIL ratings specified herein.

2.06 Current Transformers

Where a grounded neutral is provided, a neutral current transformer shall be furnished for protection and monitoring purposes.

The neutral CT shall be located at the transformer neutral connection and installed to permit measurement of transformer neutral current.

The CT ratio, burden, accuracy class, and thermal rating factor shall be coordinated with the project protection design and relay requirements.

Minimum performance requirements shall include:

Ratio: 50:5 Accuracy Class: C50 minimum Frequency: 60 Hz Location: Adjacent to H0 neutral connection

Final CT ratio is shown on the electrical one-lines and shall be subject to approval by the Engineer of Record and protection engineer.

2.07 COOLING EQUIPMENT

Transformer shall be self-cooled (OA/ONAN) unless additional cooling is required by the manufacturer to achieve specified ratings.

Where forced-air cooling (FA/ONAF) is required, cooling equipment shall be automatically controlled and shall include:

• Cooling fans

• Fan controls

• Temperature controller

• Top-oil temperature monitoring

• Winding temperature monitoring

• Control wiring and auxiliary devices necessary for operation

All cooling equipment shall be furnished as part of the transformer package.

2.08 ACCESSORIES

Provide compatibility for the following as equipment:

• Liquid level gauge

• Pressure-vacuum gauge

• Pressure relief device with operation indicator

• Sampling valve

• 1-inch drain valve

• Ground pads

• Lifting lugs

• Jacking pads

• Stainless steel nameplate

• Arc-flash warning labels

• Electrical hazard labels

• Stainless steel hardware

• Dial thermometer

2.09 PROTECTION AND STUDY DATA

The transformer manufacturer shall provide all electrical characteristics necessary to support the project protective-relaying studies.

Transformer protective devices and internal fusing shall be coordinated with the project protection philosophy

Where internal transformer fuses are provided, fuse type, ratings, interrupting capability, and coordination information shall be included in the transformer submittal package.

Internal transformer fuses shall not be provided unless specifically approved by the Engineer and serving utility.

Internal transformer fusing shall not replace specified relay protection requirements unless specifically approved by the Engineer.

Submitted information shall include:

• Transformer winding connections.

• Sequence impedance data.

• Ground-fault current characteristics.

• Through-fault withstand ratings.

• Inrush-current characteristics.

• Excitation-current values.

• Neutral grounding data.

The manufacturer shall identify any transformer characteristics that may affect ground-fault protection, differential protection, overcurrent protection, or utility interconnection requirements.

PART 3 – EXECUTION

3.01 INSTALLATION

Install the transformer in accordance with:

• Manufacturer's instructions

• IEEE C2

• National Electrical Code (NEC)

• Ground the transformer directly to the station grounding grid.

3.02 FACTORY TESTING

Conduct routine factory tests in accordance with IEEE C57.12.90, including:

• Ratio test

• Polarity and phase-relation test

• Winding resistance test

• Excitation current test

• No-load loss test

• Load loss and impedance test

• Applied potential test

• Induced potential test

• Insulation power factor test

• Leak test

Certified test reports shall be submitted.

3.03 FIELD QUALITY CONTROL

Shipment and Delivery: Liquid-filled transformers shall be completely assembled with tanks filled and fully pressurized prior to shipment. Data records confirming such conditions shall be shipped with the transformer. Transformers found to be leaking upon delivery will not be accepted. Contractor shall be fully responsible for any damages to transformers during delivery and for ensuring the good condition of transformers during delivery and for the duration of this project.

3.04 FIELD ACCEPTANCE TESTING

Perform the following tests and inspections:

• Visual inspection

• Insulation resistance testing

• Transformer turns-ratio testing

• Winding resistance testing

• Protective device verification

• Cooling system functional testing

• Ground continuity verification

Inspections and tests are to be done according to the manufacturer's instructions. For test method and data correction factors, conform to IEEE Standard Test Codes C57.12.90 for liquid-filled units.

Objective is to ensure transformer installation complies with Contract Documents, is operational within industry and manufacturer's tolerances, and is suitable for energizing.

Submit a complete field acceptance test report.

3.06 ADJUSTMENTS

• Adjust tap changer to achieve the required operating voltage.

• Record final tap position and operating voltages.

• Include final settings in closeout documentation.

• Upon satisfactory completion of tests for each transformer, attach a dated and signed "Satisfactory Test" label to the unit.

• Notification of tests at least one week in advance of test commencement.

• A written report on observations and tests.

• Report on defective materials and workmanship.

• Inspection of accessible components for cleanliness, mechanical, and electrical integrity, for presence of damage or deterioration, and to ensure removal of temporary shipping bracing. Do not proceed with tests until deficiencies are corrected.

• Transformer tank shall withstand full vacuum and pressures encountered during shipment and operation.

• Transformer shall be designed to meet project seismic requirements.

• Complete nameplate data in accordance with IEEE C57.12.00.

END OF SECTION 16320

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SCO #16-14441-02G

16230 Engine Generator Assemblies with Enclosures and Platforms

16230 - ENGINE GENERATOR ASSEMBLIES WITH ENCLOSURES AND PLATFORMS

1. GENERAL

This specification describes the performance, quality, and certain construction details of engine/generator sets and associated equipment. Each system shall be a coordinated assembly of compatible components.

2. CODES AND STANDARDS

The supplied equipment is to meet or exceed all applicable national, state and local codes and standards including:

• ANSI/NFPA 70 National Electric Code

• ANSI/NFPA 110 Emergency and Standby Power Systems Level

• ANSI/NFPA 30 Flammable and Combustible Liquids Code

• ANSI/NFPA 37 Standards for Stationary Combustion Engines and Gas Turbines

• ASME B 15.1 Safety Standards for Mechanical Power Transmission.

• UL 142 Steel Aboveground Tanks for Flammable Combustible Liquids

• CFR TITLE 40 Protection of Environment

• FCC Part 15 Subpart B: Electromagnetic Compatibility

• ISO 8528 Engine Driven Generator Sets

• UL 508 Industrial Control Equipment

• UL 2200 Safety Stationary Engine Generator Assemblies

These specifications are intended to impose requirements the same as, or more stringent than, the applicable standards and shall be so interpreted. In case of conflict between these specifications and applicable standards where the more stringent requirement is not clear, the Engineer shall be consulted for an interpretation.

3. DOCUMENTATION AND DRAWINGS

Approval submittals shall be provided within 30 days after contract award for the following:

• Schedule identifying drawings, construction and shipment dates.

• Factory published specification sheets.

• Manufacturer’s catalog cut sheets of all auxiliary components (battery charger, jacket heater, control panel, power circuit breaker, weather protected enclosure, fuel tank, access stairs/walkways, etc.).

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• Weights of all equipment.

• Plan and elevation drawings showing conduit and piping entry locations, layout, stub-up locations, grounding pad locations, and major bonding connection points.

• Engine mechanical data including heat rejection, exhaust gas flows, fuel consumption, fluid capacities and fluid fill ports, etc.

• Estimated generator running time at 25%, 50%, 75% and 100% capacity starting with a full tank of fuel.

• Generator electrical data including temperature and insulation rating, cooling requirements, excitation ratings, voltage regulation, efficiencies, voltage waveform distortion and telephone influence factor.

• Interconnection wiring diagram of complete system including switchgear, fuel tank, battery charger, jacket heater, control panel, remote alarm and control connections, etc.

• Elementary and control power connections drawings showing all field connections including circuits connecting equipment to switchgear.

• Generator resistances, reactances, and time constants.

• Generator locked rotor and starting curves.

• Documentation including maximum expected transient voltage and frequency dips and recovery time during operation of the generator set at the specified site conditions with the specified loads.

• Manufacturer and Dealers written warranty and service agreement.

Engineered Drawings shall be submitted in latest version of AutoCAD electronic format as well as in hard copy format as described in the overall requirements. Manufacturer’s equipment data sheets, warranty and service agreements shall be submitted in latest version of Adobe PDF electronic format as described in the overall requirements.

Drawings will be for the exact material or equipment to be supplied or installed and shall be clearly marked to show specific model and any options or modifications.

Drawings and data submitted shall be fully completed and certified by the Contractor to be in compliance with the requirements of these specifications.

All correspondence shall be identified with the SCO # 16-14441-02G.

The Engineer's review of drawings will cover only general conformity of the data to the requirements of this Specification, external connections, interfaces with equipment and materials furnished under separate specifications, and dimensions which affect equipment arrangement. The Engineer's review does not indicate a thorough review of all dimensions, quantities, and details of the equipment, material device, or item indicated or the accuracy of the information submitted; or shall review by the Engineer by construed as relieving the Contractor from and responsibility for errors or deviations from the requirements of these specifications.

No material or equipment shall be ordered, shipped, or installed prior to submission and review of manufacturer's drawings. Any material or equipment installed prior to submission and review of drawing shall be removed, replaced, or reinstalled at the owners option.

Complete owners manuals consisting of maintenance recommendations and instructions, system descriptions and ratings, parts manuals and all submitted drawings shall be submitted when the final items of material are shipped. Quantities of owners manuals shall be as specified.

4. FACTORY TESTING

The completed engine generator sets shall be factory tested to prove rated performance. At a minimum, the performance test shall include:

Standby Generators Project Page 3 of 18

• Two hour load test at 100 percent specified rating at 80 percent power factor with inlet and outlet coolant flow rates and temperatures held to design levels for the radiators to be furnished operating at maximum specified ambient temperatures. Record voltage, frequency, load current, stator winding temperature, power output, oil pressure, coolant inlet and outlet temperatures every five minutes during test.

• Generator efficiency engine fuel consumption and exhaust emissions at 25 percent, 50 percent, 75 percent and 100 percent prime rated load.

• Harmonic content of generated voltage and current at 25 and 100 percent of rated load.

• Transient voltage and frequency response for 50 percent, 75 percent and 100 percent step load pickup.

• Alarm and safety shutdown function.

• Verify that exhaust back pressure at full-rated load is within manufacturer's published allowable limits for the engine.

Schedule test and furnish 10 days notice of the time and date of the above test so if they so choose, owners representatives can arrange to witness the test.

Factory hydrostatic tests of the radiators, engine water jacket, day tanks and fuel coolers are to be performed at 200 percent of design pressure.

Furnish certified test reports of all of the above factory tests to the engineer within 15 days of test.

5. FIELD TESTING AND COMMISSIONING

The engine generator supplier shall perform field test on the engine generator and accessories. The test objectives are to ensure that the equipment is operational within industry tolerances, is installed in accordance with the specified requirements, and is suitable for operation and energization.

The test of engine generators and accessories shall include such other examinations as are needed to meet the specified objectives, including the following:

• Verify equipment is installed correctly.

• Check all fluid levels.

• Test generator insulation system for power factor and insulation resistance. Verify by dielectric absorption test that polarization index levels are according to IEEE 43, Testing Insulation Resistance of Rotating Machinery.

• Verify proper operation of surge arrestors and capacitors.

• Verify proper voltage and phase rotation at switchgear prior to connecting generator to load.

• Inspect and test battery and charger installation. Verify charging voltages and charging rates under float and equalize conditions. Meet manufacturers recommendations for the batteries furnished. Perform an integrity load test and capacity load test for the battery.

• Methodically verify proper installation, connection, and integrity of each element of engine generator system before and during system operation. Check for air, exhaust, and fluid leaks.

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• Four hour load test utilizing load banks to provide one hour test at 50 percent, one hour at 75 percent, and two hours at 100 percent specified rating at 80 percent power factor with inlet and outlet coolant flow rates and temperatures held to design levels for the radiators to be furnished operating at maximum specified ambient temperatures. Record voltage, frequency, load current, stator winding temperature, power output, oil pressure, coolant inlet and outlet temperatures every five minutes during test.

• Simulate malfunctions to verify proper operation of local and remote protective, alarm, and monitoring devices.

• Measure sound pressure levels to verify conformance with noise specifications for silencers, radiators, and weather protected enclosures.

• Correct deficiencies identified by tests and observations and retest until specified requirements are met.

• Verify generator will start and maintain all designated load.

• Emissions test to verify on site emissions meet EPA Tier 2 requirements.

• The following parameters should be monitored and periodically recorded:

• Oil pressure

• Coolant temperature

• Battery charge rate

• AC Volts

• AC Amperes on all phases

• Frequency

• Kilowatts

• Ambient Temperature

• Torsional Vibration

• Noise Level 23 feet from weather protected enclosure

The engine/generator manufacturer's field engineer shall supervise the installation and testing of the provided equipment and shall place the equipment in service and to adjust and calibrate the system for smooth and efficient performance.

6. TRAINING

The manufacturers factory trained and authorized technician shall provide training consisting of eight hours of field instruction and exercises involving actual operation of the engine generators and auxiliary equipment.

The training shall be provided for a minimum of five (5) of the owners personnel and shall include:

• Operational Theory

• Periodic Maintenance Procedures

• Demand Maintenance Procedures

• Trouble Shooting Guide

• Exhaust System Maintenance

• Emergency and Manual Operating Procedures

Standby Generators Project Page 5 of 18

7. WARRANTY

The manufacturer's and dealer's standard warranty shall in no event be for a period of less than two (2) years from date of acceptance of the system and shall include repair labor, parts, reasonable travel expense necessary for repairs at the job site, and expendables (lubricating oil, filters, antifreeze, and other service items made unusable by the defect) used during the course of repair. Submittals received without written warranties as specified will be rejected in their entirety.

A five year extended warranty is to be included as a separate item in proposals and shall include all items required above for the two year warranty.

8. SERVICE

Engine/Generator manufacturer shall have an established service and maintenance organization capable of servicing the specified engine generators and auxiliary equipment on an emergency on call basis, 24 hours a day, 365 days a year. All service work is to be performed by trained, qualified and factory certified technicians located to respond within 2 hours of call. In addition, qualified technical field service representatives shall be available by phone within 1 hour.

A five year extended service and maintenance contract is to be included as a separate item in proposals and is to include at a minimum the following services performed on a quarterly basis.

• Inspection of all equipment

• Cleaning

• Fluid, filter, and other expendable replacement

• Load test

• Calibration and balancing of entire system

• Maintenance report

All maintenance and expendable replacement is to be performed as recommended by the manufacturer for engines used in the service described in these specifications.

9. MANUFACTURERS

Subject to compliance with these specifications, equipment manufactured by the following suppliers may be furnished:

Engine Generator Sets

Caterpillar, Inc.

Cummins Power Generators

MTU Onsite Energy

Standby Generators Project Page 6 of 18

10. ENGINES

GENERAL

Engines are to be liquid cooled, compression ignited, direct fuel injected, turbocharged and intercooled diesel engines designed to run on ultra-low sulfur diesel fuel. Engines are to operate at a maximum of 1800 RPM, 4 cycle, and are to be of heavy duty stationary design complying with NFPA 37. The engines are to be completely overhaulable to restore the engine to like new condition. Engines shall feature regrindable forged steel crankshafts, replaceable cylinder liners, replaceable valve seats and rebuildable pumps to ensure overhaul ability.

GOVERNOR SYSTEM

The engine governor system shall include an electronic governor and electro/hydraulic actuators. The electronic governor and speed control shall operate in the utility parallel or isolated modes as follows:

• Isochronous speed control (± 0.25 percent steady state)

• Speed sensing via optoelectric or magnetic sensing of engine shaft or flywheel position

• Load sharing (± 5 percent of rated kW)

The governor shall be equipped with adjustable ramp timers and adjustable fuel limiter to control speed and smoke on startups.

FUEL SYSTEM

The engines shall be fitted with a self-lubricating engine mounted fuel transfer pump of adequate capacity for all starting and load conditions and capable of pumping the required fuel from a sub base fuel tank as specified and provided with each generator system. Fuel injectors shall be variable displacement type integral injection pumps driven by the engine camshaft and adjustment for timing and cylinder pressure balancing. The fuel transfer pump, injectors, timing mechanism and fuel rack shall be adjustment and maintenance free for the life of the equipment.

A fuel/water separator, spin on fuel filter with valve to prevent spill, and manual fuel priming pump shall be furnished. Flexible stainless steel braided fuel lines with threaded connectors for connection to the fuel supply shall be located on the engine generator assembly.

A fuel cooler for cooling of returned fuel shall be included as recommended or required by the engine manufacturer.

AIR SUPPLY SYSTEM

Engine combustion air shall be obtained directly from the surrounding ambient environment without piping for external air. Engines shall be fitted with intake air silencers and dry type easily replaceable air filters rated for normal service. The air filters shall be rated for and capable of exceeding 250 hours operation before requiring replacement. Turbochargers shall be pressure lubricated with engine oil. All intake air system components including intercooler and turbocharger shall be painted/coated to prevent oxidation or manufactured of oxidation resistant material.

The engines shall be provided with crankcase canisters, to allow all emissions to be recirculated to the engine.

Under no circumstances shall the crankcase be vented directly to the atmosphere.

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LUBRICATION SYSTEM

Engine lubrication shall be provided by a positive displacement full pressure oil pump, gear driven from the engine cam or drive shaft. A full flow oil filter and strainer with automatic emergency bypass shall be provided and arranged for easy filter change without oil spillage. Provide a dipstick and crankcase oil drain arranged for convenient complete gravity drainage of the lubricating oil without the use of pumps, siphons or special tools.

Provide an engine or frame mounted oil cooler to maintain lube oil at manufacturer's recommended optimum temperature through 2 hours of operation at 110 percent of standby rating at maximum ambient temperature.

Lubricating oil to fill the crankcase as recommended by the engine manufacturer shall be furnished and installed in the engine.

COOLING SYSTEM

The cooling system shall be designed for operation with 50 percent ethylene glycol and 50 percent water coolant.

Sufficient ethylene glycol antifreeze with inhibitors shall be furnished with the engine to fill the entire cooling system.

Interchangeable nonadjustable automatic thermostat regulation is to be provided to maintain engine operating temperature. Thermostats are to be normally open valves that return to open position when actuator fails.

A jacket water heater(s) with adjustable thermostat shall be furnished to maintain engine temperature for easy starting over the ambient conditions specified. The jacket heater(s) shall operate from 240 V 60 Hz AC. A water pump shall be provided to circulate water through the engine when the jacket heater is in operation. The circulating water pump shall operate from 120 V or 240V, 60 Hz AC.

Engines shall be furnished with unit mounted radiators. An engine mounted gear driven, self-lubricated water pump(s) shall be provided for circulation of coolant to the radiators. The pump(s) shall be of sufficient capacity to provide the required coolant flow rates to the radiators.

Air requirements for the radiators are an important consideration of this project. Provide radiators with the minimum air flow CFM requirements consistent with effective cooling and maintenance of all generator set ratings.

Radiators shall be of single or dual circuit design as required by engine cooling needs and shall be sized to conservatively maintain the rated standby engine output in the maximum ambient temperature specified. The radiators will be cooled with air from the surrounding ambient environment air drawn into the generator set enclosure as specified.

Radiators shall be furnished with surge expansion tanks sufficient to contain expansion of total system coolant from cold start to 110 percent standby load condition. Each radiator shall be equipped with a liquid level gauge glass and petcock and shall include a filler cap with pressure valve and vacuum valve. Drain cocks shall be provided to drain the radiator.

11. EXHAUST SYSTEM

The exhaust system must be a fully integrated system that meets all current federal, state, and local requirements, including but not limited to EPA Tier 2 certified for emergency stationary applications.

Certification and testing must be in accordance with all current federal, state, and local requirements.

The supplier will provide a complete exhaust system including the flexible connector at the engine. The system shall be designed not to exceed the maximum back pressure allowed by the engine manufacturer. The system shall be designed to function within the system weather protected enclosures as specified.

The Manufacturers standard warranty or extended warranty shall include the entire exhaust system.

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12. CONTROL PANEL

The engine generator set control panel shall include a positive image LCD display with 4 lines of text based alarm / events descriptions and the following functions:

• Standard ISO labeling

• Remote Start/Stop control

• Local Run/Off/Auto control

• Cool down timer

• Speed Adjust

• Lamp Test

• Emergency stop button

• Voltage adjustment

• Voltage regulator V/Hz slope adjustment

• Password protected system programming

The manufacturer’s standard engine mounted control panel shall be provided including as a minimum the following digital readouts:

Engine:

• Engine oil pressure

• Engine oil temperature

• Engine coolant temperature

• Engine RPM

• Battery volts

• Engine hours

• Engine crank attempt counter

• Engine successful start counter

• Service maintenance interval

• Engine exhaust stack temperature

• Engine main bearing temperature

Generator:

• AC volts (line to line, line to neutral and average)

• AC current (average and per phase)

• Frequency

• kW (total and per phase)

• kVA (total and per phase)

• kVAR (total and per phase)

• Power factor

• Total kW-hr

• %kW

• %kVA

• %kVAR

• Bearing temperature

• Stator winding temperature

ALARMS AND SHUTDOWNS

All manufacturers standard engine mounted alarms and shutdowns shall be provided and at a minimum shall include:

Engine Alarm / Shutdown

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• Low oil pressure alarm / shutdown

• High coolant temperature alarm / shutdown

• Loss of coolant shutdown

• Over speed shutdown

• Over crank shutdown

• Emergency stop shutdown

• Low coolant temperature alarm

• Low battery voltage alarm

• Control switch not in auto position alarm

• Battery charger failure alarm

Generator Alarm / Shutdown

• Phase Sequence

• Over voltage

• Under voltage

• Over frequency

• Under frequency

• Reverse power (real and reactive)

• Overcurrent

Voltage Regulator Alarm / Shutdown

• Loss of excitation alarm / shutdown

• Instantaneous over excitation alarm / shutdown

• Time over excitation alarm / shutdown

• Rotating diode failure

• Loss of sensing

• Loss of PMG (pulse magnetic generator)

Shutdowns and alarms shall be factory tested and calibrated with certified test reports furnished by submittal process. Displayed values shall be in English units.

PROGRMMABLE INPUTS AND OUTPUTS

The system controller shall have the ability to accept programmable digital input signals which can be programmed for either high or low activation using normally open or normally closed contacts.

The system controller shall have the ability to operate relay output signals. The output relays shall be rated 2 Amp at 30 Volts dc and consist of six (6) normally open contacts and 2 normally open/normally closed contacts.

REMOTE COMMUNICATIONS

The system controller shall include Modbus RTU communications as standard using RS-485 half duplex with configurable baud rates from 2.4 to 57.6K.

The manufacturers standard control and status points shall be provided in the system controllers remote communication data map.

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13. CONTROL SYSTEM INTERCONNECTION AND WIRING

Provisions for alarm, shutdown and control interconnections to the engine shall be made in a single engine mounted junction box arranged for convenient conduit entry from below. The junction box shall be of sufficient size to facilitate easy installation of interconnection wiring and shall contain well marked barrier type screw terminal blocks. Control and auxiliary wiring for the engine/generator shall be protected in metallic conduit or metallic wireway and shall be bonded in accordance with NFPA 70. Each wire shall be labeled on both ends at the connectors and connectors are to be ring tongue type.

14. STARTING SYSTEM

Each engine shall be furnished with two (2) heavy duty electric starting motors rated 24 VDC. Each motor shall be capable of starting the engine at ambient temperature of -10 degrees F. The starting motors shall be automatically engaged and released without binding. The starting system shall be rated for four ten second starting attempts with 10 second rests between attempts.

Starting batteries shall be of the lead acid type and shall be capable of supplying the above four attempt starting cycle at least three times without recharging. The battery units shall be furnished in translucent plastic containers and shall be shipped complete with electrolyte and fully charged. The battery units shall be packaged in 12 volt assemblies.

The batteries shall be full replacement warranted for a minimum of three years. The battery manufacturers extended warranty shall be furnished to the owner.

A two or three step battery rack shall be furnished. The battery rack shall be fully painted before assembly with two coats of electrolyte resistant paint in ANSI-61 light gray color or approved manufacturers standard color. The battery shall be provided with electrical connections between cells and between rows of cells and connector covers. Cell numbers are to be provided for each cell.

Battery cables are to be provided and sized as needed for length required. Battery charger is to be of constant voltage, current limiting design suitable for float charging of the above batteries and capable of restoring complete battery charge within 24 hours after complete discharge operation. The charger current limiting function is to be self-protecting such that cranking disconnect of the battery charger is not required. An equalize charge setting with adjustable timer is to be provided. Regulation of float voltage shall be with ± 0.5 percent from no load to full load with ± 10 percent input voltage variation. Battery charger is to be equipped with door mounted voltmeter and ammeter to monitor charger output. The battery charger shall be equipped with an adjustable low DC voltage alarm with adjustable time delay. The battery charger shall be furnished with front panel AC and DC circuit breakers. Input power is to be 120/240 V 60 Hz AC.

15. GENERATORS

GENERAL

The generators furnished shall be three-phase, salient pole, rotating field, AC synchronous alternators, rated 1800 RPM maximum, 60 Hz. The generators shall be 2/3 pitch, form wound, drip proof, self-ventilating construction and shall be provided with excitation system, voltage regulator, surge suppression and space heater.

BEARINGS AND COUPLINGS

The generator shall be of either one or two bearing design. The bearing(s) shall be of the ball or roller type and shall be regreasable. Shields and seals shall be provided to prevent the migration of lubricant into the generator rotor or stator windings.

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A single bearing generator rotor shall be coupled to the engine through a pilot directly into the engine flywheel with engine torque transmitted through a flexible steel plate connector.

A two bearing generator rotor shall be coupled to the engine through a flexible steel plate connector.

Flexible connectors are to be of disc type design to absorb and prevent equipment damage from sudden shock.

EXCITATION SYSTEM

Generator excitation shall be provided by a rotating, brushless exciter system. A permanent magnet generator mounted on the rotor shaft shall provide power for the excitation system. The exciter system shall sustain short circuit currents which are a minimum of 300 percent of maximum rated full load current for a minimum of 10 seconds without damage to the exciter or generator.

VOLTAGE REGULATOR

The voltage regulator shall be of solid state, temperature compensated, three-phase sensing, EMI/RFI suppressed, volts per hertz design. The regulator volts/hertz characteristic shall be of 2/1 ratio. The regulator shall provide a minimum voltage adjustment range of ± 10 percent of nominal and shall be furnished with manual adjustment potentiometers or calibrators and automatic return to setpoint potentiometers required for the manual and automatic voltage matching synchronizing sequences described.

INSULATION SYSTEM

The generator stator and rotor insulation system shall meet NEMA standard MG1 for Class H and shall be vacuum pressure impregnated with epoxy varnish. Temperature rise of the rotor and stator at standby rating shall be limited to NEMA Class F to provide long life. The insulation system shall be resistant to fungus and to moisture absorption.

CIRCUIT BREAKER

For the Base Bid, 1,750 kW generator at the North Site, the generator breaker will be provided within a 5 kV switchgear cabinet. The Base Bid 4.16 kV generator shall not be provided with a generator-mounted circuit breaker. Generator output protection and isolation shall be provided by the 5 kV generator incoming circuit breaker located in the generator switchgear, as indicated on the drawings. Provide a suitable medium-voltage terminal box and connections for the generator output conductors.

For the Alternate 1 Bid, 1,000 kW generator at the North Site and 750 kW generator at the South Site the generator circuit breaker shall be as follows:

• Generator mounted, 100% rated circuit breaker shall be provided. The circuit breaker shall be insulated case, electrically operated, 3 pole, with manufacturers standard ampere rating required for the specified generator sets. The circuit breaker shall utilize a SEL-300G protection relay with optional synchronization check and current differential element functions. The breaker shall be UL/CSA Listed, connected to engine/generator safety shutdowns, and automatically controlled by the package mounted generator set controls. The circuit breaker shall be housed in NEMA1 extension terminal box isolated from vibrations induced by the generator set. Mechanical type lugs suitable for copper conductors, sized for the circuit breaker feeders shown on the drawings, shall be supplied on the load side of the breaker.

• The circuit breaker and protective control circuit shall be designed to include differential relaying and an ERMS Switch for arc-energy reduction of breakers rated greater than 1200 amps.

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COOLING SYSTEM

The generator shall be self-ventilating by…