Engine_Generators_Pre-Purchase_Package_SPECS_DRAWINGS.pdf

Architectural & Engineering Services for Wastewater Treatment Backup Generators

Engine Generators Pre-Purchase Package March 2026

Hazen and Sawyer

999 Ponce de Leon Boulevard, Suite 1150

Coral Gables, Florida 33134 • (305) 443-4001

EXECUTIVE SUMMARY

Architectural & Engineering Services for Wastewater Treatment Plant Backup Generators

Engine Generators Pre-Purchase Package

The City of Homestead (City) is undertaking a critical infrastructure initiative to enhance the resilience and operational reliability of its wastewater treatment facility during electrical service interruptions. Supported by funding from the U.S. Department of Housing and Urban

Development’s Community Development Block Grant Mitigation Program, the project will ensure that the facility can maintain full operational capability during utility outages.

Due to extended equipment lead times, the City has elected to pre-purchase key components of the facility’s backup power system. These components include three (3) diesel engine generators, a generator output switchboard (SWBD-GEN) equipped with permanent connections for a portable generator, and a distribution switchboard (SWBD-DIST) housing an Automatic Transfer

Controller (ATC).

The three (3) generators will operate in parallel under the control of a Master Paralleling

Controller. The generator output switchboard will serve as the common collection point for the generator outputs, combining them into one output connection that powers the distribution switchboard. The generator output switchboard also includes a permanent portable generator connection, as required by the National Electrical Code (NEC), to provide an additional layer of operational continuity during scheduled maintenance or when the permanent generators are unavailable. The ATC at the distribution switchboard will perform all monitoring, control, and transfer operations required to automatically switch between utility and generator power during outages and subsequently return the load to utility power once conditions stabilize.

For procurement efficiency, the City has divided the overall pre-purchase effort has been divided into two packages. This package specifically covers the furnishing of three (3) diesel engine-generators designed for parallel operation.

CITY OF HOMESTEAD 00 01 10

WASTEWATER TREATMENT PLANT BACKUP GENERATORS

ENGINE GENERATORS PRE-PURCHASE PACKAGE

SECTION 00 01 10

TABLE OF CONTENTS

DIVISION 26 − ELECTRICAL

Section Title

26 32 13 Engine Generators

ATTACHMENTS

Attachment A Engine Generators Division of Responsibilities

Attachment B Electrical Drawings

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ENGINE GENERATORS PRE-PURCHASE PACKAGE

SECTION 26 32 13

ENGINE GENERATORS

PART 1 – GENERAL

1.01 SUMMARY

A. Definitions

1. ENGINE-GENERATOR SUPPLIER – The vendor responsible for furnishing equipment specified in this section.

2. Manufacturer – The actual entity responsible for manufacturing, factory testing, and warrantying the engine-generator.

B. Scope

1. This Section specifies the requirements for providing three (3) complete and operable, diesel engine-driven engine generators.

2. The ENGINE-GENERATOR SUPPLIER shall provide equipment in conformance to the specified requirements. The furnished equipment shall be subject to review for all applicable permits, inspections, and approval by the proper authorities in local jurisdiction of such work. ENGINE-GENERATOR SUPPLIER shall provide all generator equipment production model technical information necessary for others to apply for permits, inspections, and approvals. The local jurisdictions are the City of Homestead, Miami-Dade County, and the State of Florida.

3. The ENGINE-GENERATOR SUPPLIER shall verify that all devices necessary for a properly functioning engine-generator system have been provided.

1.02 THE REQUIREMENT

A. The ENGINE-GENERATOR SUPPLIER shall furnish three (3) Class 120, Type 10 power engine generator sets complete with all accessories and appurtenances as required and as specified herein.

B. The entire generator, including the engine, alternator, controls, wiring, and enclosure shall be listed as a complete assembly to UL 2200.

C. It is the intent under this Contract to require the engine-generator system to be complete in every detail whether or not indicated on the Drawings or specified. Consequently, the

ENGINE-GENERATOR SUPPLIER is responsible for all details, devices, accessories

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and special construction necessary to properly install, adjust, test, and place in successful and continuous operation the engine-generator set.

D. All three (3) engine-generators furnished under this Section shall be capable of parallel operation through a master paralleling control system providing full supervisory, synchronization, and load-sharing functions. The Master Paralleling Controller shall be furnished by the engine-generator manufacturer to ensure full compatibility with the generator control architecture.

E. The ENGINE-GENERATOR SUPPLIER shall accept responsibility to warrant, design, manufacture, factory test, witness test, ship, provide coordination of installation as needed, provide all specified field testing and commissioning, training, and operations and maintenance manuals for all equipment specified in this Section.

F. Use materials which are new, unused, and as specified. If not specifically indicated, use the best and most suitable materials of their kinds for the purpose intended, and for the design and expected conditions of service, subject to the approval of the Engineer.

G. Provide workmanship that is first class in every respect. Employ workers thoroughly experienced in such work. A neat and workmanlike appearance in the finished work shall be required.

H. All materials used shall bear the inspection labels of the Underwriter's Laboratories, if the material is of a class inspected by the Laboratory.

I. Unless otherwise indicated, the materials to be provided under this Specification shall be the products of manufacturers regularly engaged in the production of all such items and shall be the manufacturer's latest design. The products shall conform to the applicable standards of UL and NEMA, unless specified otherwise. International Electrotechnical

Commission (IEC) standards are not recognized. Equipment designed, manufactured, and labeled in compliance with IEC standards is not acceptable.

J. The engine generator sets shall fully comply with all current Environmental Protection

Agency (EPA) emission regulations including, but not limited to, the New Source

Performance Standards (NSPS) for stationary and non-road generator sets. The engine generator set(s) shall meet the EPA new source performance requirements required at the time the engine generator set(s) submittal is approved by the Engineer. Engines manufactured previous to the submittal approval date that do not meet the current regulated emissions levels are not acceptable.

K. The engine generator sets and all associated equipment furnished under this section shall comply with all applicable Build America, Buy America (BABA) requirements.

1.03 CODES AND STANDARDS

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A. The packaged engine-generator system shall comply with the following Codes and

Standards as a minimum:

1. NEMA MG1 – Motors and Generators.

2. NEMA MG2 – Safety Standard for Construction and Guide for Selection, Installation and Use of Motors and Generators.

3. ISO STD 8528 – Reciprocating Internal Combustion Engines.

4. ISO STD 3046 – Performance Standard for Reciprocating Internal Combustion

Engines.

5. NFPA 30 – Flammable and Combustible Liquids Code.

6. NFPA 37 – Standard for Installation and use of Stationary Combustible Engine and

Gas Turbines.

7. NFPA 70 – National Electrical Code

8. NFPA 70E – Standard for Electrical Safety in the Workplace

9. NFPA 110 – Standard for Emergency and Standby Power Systems.

10. UL 508 – Industrial Control Equipment.

11. EGSA – Electrical Generating Systems Association.

12. UL 2200 – Stationary Engine Generator Assemblies

13. ANSI C57 – Dry-Type Transformers.

14. UL 142 – Steel Aboveground Tanks for Flammable and Combustible Liquids.

15. UL 1236 – Standard for Battery Chargers for Charging Engine Starter Batteries.

1.04 SUBMITTALS

A. In accordance with the procedures and requirements set forth in the General Conditions

, the ENGINE-GENERATOR SUPPLIER shall obtain from the equipment manufacturer and submit the following:

1. Shop Drawings

2. Spare Parts List

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3. Reports of Certified Shop and Field Tests

4. Operation and Maintenance Manuals

5. Manufacturer's Field Start-up Report

6. Manufacturer's Representative's Installation Certification

B. Each submittal shall be identified by the applicable Specification Section.

1.05 SHOP DRAWINGS

A. Each submittal shall be complete in all respects, incorporating all information and data listed herein and all additional information required for evaluation of the proposed equipment's compliance with the Contract Documents.

B. Partial, incomplete or illegible submittals will be returned to the ENGINE-GENERATOR

SUPPLIER without review for resubmittal.

C. Shop drawings for each engine-generator set shall include but not be limited to:

1. A Compliance, Deviations, and Exceptions (CD&E) letter. If the shop drawings are submitted without this CD&E letter, the submittal will be rejected. The letter shall include all comments, deviations and exceptions taken to the Drawings and

Specifications by the ENGINE-GENERATOR SUPPLIER. This letter shall include a copy of this Specification Section. In the left margin beside each and every paragraph/item, a letter “C”, “D”, or “E” shall be typed or written in. The letter “C” shall be for full compliance with the requirement. The letter “D” shall be for a deviation from the requirement. The letter “E” shall be for taking exception to a requirement. Any requirements with the letter “D” or “E” beside them shall be provided with a full typewritten explanation of the deviation/exception. Handwritten explanation of the deviations/exceptions is not acceptable. The CD&E letter shall also address deviations, and exceptions taken to each Drawing related to this

Specification Section.

2. Manufacturers printed specification sheets showing critical engine and generator set specifications including the following:

a. Dimensions, and weights

b. Guaranteed fuel consumption at 25%, 50%, 75% and 100% of full rated load

c. Engine bhp available

d. Brake Mean Effective Pressure (BMEP)

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e. Engine jacket water heat rejection

f. Exhaust flow rate and temperature at 100% of rated load

g. Ventilation and combustion air requirements

h. Exhaust backpressure limitation

i. Liquid refill capacities

j. Voltage regulation characteristics

k. Guaranteed noise levels

3. Alternator technical electrical data, including, but not limited to:

a. Alternator efficiency at 50%, 75%, and 100% load

b. Telephone Interference Factor (TIF)

c. Harmonic waveform distortion

d. Type of winding insulation and generator temperature rise

e. Per unit subtransient impedance X’’ and X/R ratios for positive, negative, and zero sequences

f. Transient reactance (Xd’)

g. Synchronous reactance (Xd)

h. Sub transient time constant (Td’’)

i. Transient time constant (Td)

j. DC time constant (Tdc)

k. Decrement curve

4. Manufacturer’s printed warranty statement of the engine and generator set showing single source responsibility by the engine manufacturer.

5. Generator control panel equipment and features. Include a written explanation of the auto start/stop logic and operation.

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6. Engine-generator set and accessory product data sheets including, but not limited to, the following:

a. Alternator strip heater

b. Radiator

c. Seismically rated vibration isolators

d. Flexible exhaust coupling

e. Exhaust silencer

f. Batteries

g. Battery charger

h. Engine manufacturer’s shutdown contactors

i. Jacket coolant heater

j. Fuel cooler

k. Fuel tank(s) and pump(s)

l. Fuel level devices

m. Output circuit breaker and trip unit

n. Conduit

o. Wire and Cable

p. Wiring Devices

q. Lighting

r. Combination power unit

7. Normal operating ranges for systems temperature, pressure and speed.

8. Manufacturer's part number for the engine and generator operation guide, parts book, service manual, warranty policy, and installation guide.

9. Location of other similar units showing compliance with the experience requirements specified herein.

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10. Phone numbers of twenty-four (24) hour products support contacts and locations.

11. Drawing showing right hand, left hand, and top views of proposed assembly;

battery rack, isolators, exhaust silencer, conduit stub up locations, and flexible fittings; wiring schematics, interconnection diagrams (point to point), and written description of engine generator controls and alarm circuits.

12. Control panel layout drawings and wiring diagrams.

13. Master Paralleling Controller panel layout drawings and wiring diagrams. Provide fully coordinated diagrams reflecting all field and factory wiring. Drawings shall include all control and communication connections, including but not limited to:

a. Remote start/stop signal from ATS/ATC

b. All interfaces to the generators

c. Required interlocks, protective circuits, and remove monitoring/SCADA connections.

14. EPA Certificate of Conformity for Exhaust Emissions

15. Drawings and specifications for base-mounted fuel storage tank with accessories and leak detection system.

16. Detailed drawings showing plan, front, and side views as well as appropriate section views of the weatherproof, engine-generator enclosure. Include product data sheets for all appurtenances (e.g. exhaust fan, thermostat, indoor and outdoor lighting, switches, receptacles, combination power unit, etc.) to be furnished and installed in the enclosure. Drawings shall be of sufficient detail to assure proper installation by the Contractor.

17. Detailed drawings of the radiator mounted load bank including top, front, and side views. Include product data sheets for all components, power wiring diagrams, control panel layout drawings, and control panel wiring diagrams. Submit instruction manuals that include installation, operation, and maintenance instructions and a spare parts list.

D. The shop drawing information shall be complete and organized in such a way that the

Engineer can determine if the requirements of these Specifications are being met.

Copies of technical bulletins, technical data sheets from "soft-cover" catalogs, and similar information which is "highlighted" or somehow identifies the specific equipment items the ENGINE-GENERATOR SUPPLIER intends to provide are acceptable and shall be submitted.

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1.06 REPORTS OF CERTIFIED SHOP AND FIELD TESTS

A. Submit two (2) certified copies of all test reports. This includes all shop tests and field tests. Certified shop test reports for prototype engine-generator sets are unacceptable.

The manufacturer’s serial number for the actual engine-generator set furnished for this project shall appear on all test reports.

1.07 OPERATION AND MAINTENANCE MANUALS

A. The ENGINE-GENERATOR SUPPLIER shall submit operation and maintenance manuals in accordance with the procedures and requirements set forth in the General

Conditions. The manuals shall include:

1. Instruction books and/or leaflets.

2. Recommended spare parts list.

3. Final as-built construction drawings included in the shop drawings incorporating all changes made in the manufacturing process.

B. Manuals shall contain complete information in connection with assembly, operation, lubrication, adjustment, wiring diagrams and schematics, maintenance, and repair, including detailed parts lists with drawings or photographs identifying the parts. Manuals shall contain all information submitted as part of the shop drawing review process.

1.08 SPARE PARTS

A. Routine maintenance and adjustments shall be performed without the use of special tools or instruments. All spare parts as recommended by the equipment manufacturer shall be furnished to the Owner by the ENGINE-GENERATOR SUPPLIER.

B. In addition to the manufacturer recommended spare parts, the ENGINE-GENERATOR

SUPPLIER shall furnish the following spare parts for each engine-generator set:

1. One (1) set of fuel oil particulate filters

2. One (1) set of air filters

3. One (1) set of lubrication oil filters

4. One (1) set of fuel/water separator filters

5. One (1) set of coolant filters

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C. The spare parts shall be packed in containers suitable for long term storage, bearing labels clearly designating the contents and the pieces of equipment for which they are intended.

D. Spare parts shall be delivered at the same time as the equipment to which they pertain.

The ENGINE-GENERATOR SUPPLIER shall properly store and safeguard such spare parts until completion of the work, at which time they shall be delivered to the Owner.

E. Spare parts list, included with the shop drawing submittal, shall indicate specific sizes, quantities, and part numbers of the items to be furnished. Terms such as "1 lot of packing material" are not acceptable.

F. Parts shall be completely identified with a numerical system to facilitate parts inventory control and stocking. Each part shall be properly identified by a separate number. Those parts which are identical for more than one size, shall have the same parts number.

G. The dealer shall have sufficient parts inventory to maintain over-the-counter availability of at least 90% of any required part and 100% availability within 48 hours.

1.09 IDENTIFICATION

A. Each engine-generator set shall be identified with the identification name/number indicated on the Drawings (e.g., Generator No. 1, Generator No. 2, etc.). A nameplate shall be securely affixed in a conspicuous place on the generator main circuit breaker.

Nameplates shall be engraved high pressure plastic laminate, black with white lettering.

1.10 WARRANTY TERMS

A. The manufacturer's and Dealer's warranty shall in no event be for a period of less than four (4) years or five hundred (500) hours of operation, whichever comes first, from date of delivery of equipment to the project site and shall include repair labor, travel expense necessary for repairs at the jobsite, and expendables (lubricating oil, filters, coolant, and other service items made unusable by the defect) used during the course of repair.

Submittals received without written warranties as specified shall be rejected in their entirety.

B. Provided warranty shall cover all equipment included in the scope of supply. This warranty shall include, but is not limited to, the following:

1. Engine-generator set and respective auxiliary equipment

2. All controls for the engine-generator set

C. Batteries shall be provided with two (2) year full replacement guarantee, and a 48-month pro-rated replacement schedule thereafter.

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1.11 OIL SAMPLING KIT

A. The generator set supplier shall provide an oil sampling analysis kit which operating personnel shall utilize for scheduled oil sampling. All equipment needed to take oil samples shall be provided in a kit and shall include the following:

1. Sample extraction gun

2. Ten (10) Bottles

3. Ten (10) Postage-paid mailers

4. Written instructions

B. An additional oil sampling kit shall be made available to the Owner to continue the sampling when the above specified kit has been depleted. All kits in addition to that specified above shall be at an additional cost to the Owner, if the Owner desires to continue the sampling service.

1.12 PREVENTIVE MAINTENANCE AGREEMENT

A. The engine/generator set supplier shall provide a preventive maintenance agreement using qualified factory trained service personnel, for a period of 2-year minimum. Provide all recommended fluids, dealer labor, travel labor and travel mileage to complete the suggested preventive maintenance as defined in the manufacturer’s Operation and

Maintenance Manual and as listed below. All parts shall be new and provided by the generator manufacturer. The maintenance agreement shall include the following as a minimum:

1. Check oil level, check oil pressure safety shutdown switches, complete an oil sample analysis, check oil pressure and gauges, and inspect the system for leaks.

Change oil and oil filter if required.

2. Check coolant level, inspect/replace cooling system hoses, check high/low temperature alarms and shutdowns, inspect radiator, inspect fan and fan belts

(tighten or replace as required). Flush coolant system and replace coolant if required.

3. Inspect the fuel system including fuel pumps and tank(s), check fuel pressure, inspect fuel filters and replace if required, and check for water in fuel storage tank.

4. Check the battery and battery charging system including a voltage test, check and clean battery terminals, check and inspect engine starting system.

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5. Inspect and test the generator, check bearing grease and add grease if required, check terminations, and complete a generator winding insulation resistance (i.e.

megger test).

6. Check engine control system including overspeed alarms and shutdowns, overcrank alarm, engine starter, circuit breaker and fuses, and test and adjust engine governor.

7. Check and the engine air intake and exhaust systems for leaks and damage.

Check air filter and replace if required.

8. Inspect all components of the generator enclosure including, but not limited to, lights, louvers, fans, doors, etc.

PART 2 – PRODUCTS

2.01 MANUFACTURERS

A. The equipment covered by this Specification is intended to be standard equipment of proven performance as manufactured by reputable concerns. Equipment shall be designed, constructed and installed in accordance with the best practices of the trade, and shall operate satisfactorily when installed as shown on the Drawings.

B. Consideration will be given only to the equipment of those manufacturers who have furnished comparable size diesel engine-generator sets for at least two (2) similar installations that have been in regular successful operation for not less than five (5) years.

C. The engine-generator set manufacturers shall be Cummins, Caterpillar, or MTU Onsite

Energy. No substitutions shall be permitted. The engine-generator set manufacturer and/or dealer shall be responsible for the entire engine-generator package including the engine-generator set with all accessories and equipment specified herein and all other devices required for a complete and operable system.

2.02 GENERAL DESCRIPTION

A. The engine-generator set shall be rated as specified herein and as indicated on the

Drawings. It shall have the capability to operate at its rating for the duration of any power outage with all accessories including engine running devices, silencer, radiator, cooling fans, fuel system, and all appurtenances complete as it would be installed in the field.

The ENGINE-GENERATOR SUPPLIER shall note and take appropriate action regarding the intended operation of the engine-generator sets while connected to motor driven loads controlled by variable frequency drives (VFDs).

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2.03 ENGINE

A. The engine shall be diesel, 4 cycle, radiator cooled, and shall be turbocharged having an operating speed of 1800 RPM. Engine shall operate on ASTM D-975 Grade No. 2D S15 ultra-low sulfur diesel fuel. Engines requiring any other fuel type are not acceptable.

B. The engine will not be acceptable if the design is a conversion of a naturally aspirated engine to which a turbo-blower has been attached, unless the engine is certified by the manufacturer as having been analyzed and redesigned with ample provisions for increased stresses and bearing or heat loads due to increased pressures and rate of heat liberation.

C. Brake mean effective pressure (BMEP) shall not exceed XXX psi at rated load. Brake

Horsepower (BHP), and Engine-Generator efficiency shall conform with ASME, IEEE and NEMA standards that electrical energy delivered by the machine is within the minimum certified guaranteed fuel oil consumption rate and evidence that these parameters have been met shall be furnished.

D. Only engine manufacturers' standard ratings shall be acceptable. No dealer special ratings will be acceptable.

E. The specified standby kW rating shall be for continuous electrical service during interruption of the normal utility source, per NEMA standards.

F. Engine speeds shall be governed by an electronic isochronous governor that will sense generator speed and provide accurate load transient correction capability at less than

0.5 percent regulation, from no load to full load generator output.

2.04 ALTERNATOR

A. The alternator shall conform to NEMA and IEEE standards and be rated as indicated on the Drawings. The alternator shall have a UL 2200 Listing. The alternator shall be brushless, salient pole, 2/3 pole pitch and synchronous for operation at 480VAC, wye connected, as indicated on the Drawings. The alternator shall be capable of delivering

2190 SkVA (minimum) at an instantaneous voltage dip of no more than 30% voltage drop.

B. Laminations and windings shall be designed for minimum reactance, low voltage waveform distortion and maximum efficiency.

C. The main stator coils shall be random wound. Insulation shall be Class F with a temperature rise of no more than 105 degrees C according to NEMA standards. The insulation system shall be made of epoxies and polyesters which are inorganic compounds and shall prevent fungus growth.

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D. The rotor shall be dynamically balanced and include amortisseur windings to minimize voltage deviations and heating effects under unbalanced load conditions.

E. Radio interference suppression (both directions) shall be provided in accordance with

NEMA and IEEE Standards.

F. The alternator shall have a brushless, permanent magnet generator (PMG) excitation support system to provide input to the automatic voltage regulator to enable the alternator to support 300% of rated current for 10 seconds to allow fault clearing.

G. Waveform deviation shall not exceed 5% from true sine wave. The transient response from no load to full load in one step of the engine-generator set shall not exceed a voltage dip of 35%, a frequency dip of 20%, and shall recover to complete steady state performance within 12 seconds for both voltage and frequency. The transient response from full load to no load in one step shall not exceed a voltage overshoot of 7% and shall recover to steady state performance within 3 seconds. Transient performance shall be in accordance with ISO 8528.

H. The Telephone Influence Factor (TIF) shall be less than 50.

I. The voltage regulator shall be an adjustable, solid-state, three-phase RMS sensing, volts/hertz type. Voltage regulation shall be a minimum of +/-0.25% from no load to continuous rating. The voltage regulator shall provide +/-10% voltage adjustment. The voltage regulator shall be located within the engine control panel.

J. An alternator mounted strip heater shall be furnished and installed as part of the system.

The strip heater shall be energized to prevent condensation when the engine generator set is not running.

2.05 CONTROLS

A. Engine generator monitoring and controls shall be mounted in a single NEMA 1

(gasketed) dust-tight enclosure. A suitable accessible terminal strip having all wires properly identified shall be furnished within the enclosure. The control panel shall be mounted at a height of 4'-8" measured from the center of the panel to the equipment pad or enclosure floor.

B. The control panel shall accept a dry contact input for engine starting from remote locations. The starting and stopping of the engine-generator set shall be initiated through the control panel only. When the engine starts, starting control shall automatically disconnect cranking controls. Four (4) cranking cycles of 10 seconds "ON", 10 seconds

"OFF" shall be provided. The starting controls shall prevent re-cranking for a definite time after source voltage has been reduced to a low value, or the four (4) cranking cycles have been reached without a successful start. The automatic engine starting

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controls shall use industrial rated control type elements throughout, and controls shall have the capability to operate at 50% battery voltage.

C. Speed sensing shall be provided to protect against accidental starter engagement with a moving flywheel. Battery charging alternation output voltage is not acceptable for this purpose.

D. A UL 489 Listed generator/exciter field circuit breaker with shunt trip device shall be furnished and installed as part of the engine generator set. Shunt trip shall be activated upon engine-generator fault conditions.

E. Engine generator monitoring and control shall be provided using a microprocessor-based control panel complete with an LCD display. The devices necessary for automatic starting shall be on the engine and in the engine control panel. Generator output frequency and voltage shall be adjustable through the control panel keypad. The following hardware (minimum) shall be provided on the front of the control panel; the use of the LCD display and keypad to accomplish the same function is not acceptable:

1. Engine control mode switch or pushbuttons (Run-Off-Auto)

2. Large, red emergency stop pushbutton

F. The following parameters (minimum) shall be shown on the LCD display or otherwise be indicated at the control panel:

1. Engine oil pressure

2. Coolant temperature

3. Generator output voltage

4. Generator output current

5. Generator elapsed run time

6. Generator output frequency

7. Engine run

8. Engine fail

9. Low coolant temperature

10. Pre-high engine temperature

11. Pre-low fuel level

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12. Engine speed (RPM)

G. The following events (minimum) shall cause an immediate shutdown of the engine-generator set if it is operating or prevent starting if it is not operating. The specific event that causes the shutdown/prevents starting shall be shown on the LCD display or otherwise be indicated at the control panel. A reset shall be required to clear the fault and allow the unit to operate:

1. Engine coolant high temperature

2. Engine low oil pressure

3. Low fuel level

4. Engine overspeed

5. Engine overcrank

6. Engine tried to start but failed

7. Low coolant level

H. The generator control panel shall have a communication port capable of transmitting all available engine-generator set data via Ethernet/IP protocol. The generator control panel shall be equipped with capabilities for fiber optic cable connection.

I. The generator control panel shall have Form C dry contacts rated 5A (minimum) at

120VAC/24VDC for the following signals:

1. Engine coolant high temperature

2. Engine low oil pressure

3. Pre-low fuel level

4. Low fuel level

5. Engine overspeed

6. Engine overcrank

7. Engine tried to start but failed

8. Low coolant level

9. Engine fail

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10. Engine run

J. The normally closed (NC) contacts for all of the above signals (except engine run and

Pre-low fuel level) shall be wired in series to provide a common "Generator System

Failure" alarm for remote indication. Other contacts shall also be wired as a part of this alarm as specified elsewhere herein.

2.06 OUTPUT CIRCUIT BREAKERS

A. Circuit breakers shall be insulated case type power circuit breakers.

B. Power circuit breakers shall be UL 1066 Listed for application at 100 percent of their continuous current rating, rated 480 VAC, 3 pole.

C. Power circuit breakers shall utilize a two-step stored-energy mechanism to charge the closing springs. The closing of the circuit breaker shall automatically charge the opening springs Power circuit breakers of equal rating shall be completely interchangeable.

D. Power circuit breakers shall be electrically operated (E.O.). All power circuit breakers shall be provided with a manual handle for manually charging the closing springs.

E. Electrically operated power circuit breakers shall be furnished with a 120 VAC powered spring charging motor, shunt trip device, and electrically operated spring release device.

F. Each power circuit breaker faceplate shall include a spring charge indicator, push-to-trip button, push-to-close mechanism release button, and open-close indicator.

G. Power circuit breakers shall be fixed-mount type as indicated on the Drawings.

H. Equip each power circuit breaker with padlocking provisions to prevent manual or electric closure of the circuit breaker.

I. Equip each power circuit breaker with current sensors and a self-powered microprocessor-based trip device to sense overload and short circuit conditions.

1. Trip devices shall be removable and interchangeable so that any trip device can be used with any frame size power circuit breaker.

2. The device shall measure true RMS currents. Peak sensing devices will not be accepted. All adjustment setting switches shall be digitally encoded type with gold contacts.

3. Trip units shall have adjustable segments as indicated on the Drawings. Long-time, short-time, and ground fault segments shall have both adjustable pickup and

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adjustable delay. Instantaneous segments shall have an adjustable pickup in addition to any high-fault trip override.

4. Circuit breakers 1200A frame or larger shall be provided with an arc energy reduction mode to reduce arc-flash energy. Arc energy reduction mode shall be activated by a factory-wired illuminated selector switch mounted on the circuit breaker door with lockable cover (or switch-and-cover with separate indicator light). Provide dry contact from the trip unit to make arc energy reduction mode status available for remote monitoring.

5. Trip units shall have programmable alarm relays that activate based on threshold and time delay values associated with any of the measured parameters. Alarm output operation shall be recorded in an event log that is saved in the trip unit’s memory.

6. The trip unit shall include an integral test pushbutton. A keypad shall be provided to enable the user to select the values of test currents within a range of available settings. The protection functions shall not be affected during test operations. The breaker shall be able to be tested in the TRIP or NO TRIP test mode.

7. Trip units shall be furnished complete with all additional modules required to facilitate all trip unit functions. Trip units shall be the Eaton PXR25, Square D

Micrologic 5.0X/6.0X, ABB Ekip Touch, or Siemens ETU 776.

J. Provide a minimum of two (2) normally open and two (2) normally closed auxiliary contacts for remote indication of power circuit breaker open/closed status.

K. The circuit breaker shall operate both manually for normal operation and automatically for protection against overload or short circuits. Generator/exciter field circuit breakers are not acceptable for this service.

2.07 ENGINE ACCESSORIES

A. Furnish and install the engine with all accessory equipment and appurtenances which are required for proper operation, including the following:

1. Heavy duty dry type air filter with restriction indicator

2. Heavy duty lubricating oil filter, bypass type, with replaceable absorbent-type elements

3. Lubricating oil cooler, water cooled

4. Heavy duty fuel oil filter, spin-on, with non-replaceable absorbent-type elements

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5. Fuel oil fuel/water separator

6. Heavy duty crankcase vapor coalescer

7. Radiator mounted fuel cooler to cool recirculated fuel before it is re-deposited into the fuel tank as recommended by the manufacturer.

2.08 MOUNTING

A. Couple the engine and generator together through a flexible, non-backlash type, all metal coupling which overcomes all normal misalignment stresses and transmits full engine torque with ample safety factor. Also provide flexible connections for piping connections.

2.09 COOLING SYSTEM

A. Provide a radiator manufactured of a non-corrosive material mounted on the engine. The radiator core shall be coated with a corrosion resistant coating. Corrosion resistant coating shall be a corrosion resistant baked phenolic coating or similar.

B. Connect the radiator to the engine internal cooling system with flexible piping. Furnish appropriately sized coolant expansion tank for the cooling system.

C. The engine shall be cooled through a radiator sized to continuously maintain safe operation at full load and at 105°F outside ambient air with 50% ethylene glycol coolant.

A blower type fan and low noise fan drive and controls shall be furnished. The fan and all rotating members and drive belts shall be guarded and meet OSHA standards. Proof of

105°F ambient temperature capability shall be required.

D. Coolant

1. After the cooling system is flushed and cleaned, provide an initial fill of coolant consisting of 50% ethylene glycol. An anti-corrosion treatment shall be added during the initial fill.

2. The coolant shall meet the requirements of the generator manufacturer including corrosion inhibitors provided in the coolant to protect the engine cooling system.

E. The engine shall be equipped with coolant heaters. Heaters shall be in accordance with the following:

1. Unit mounted thermal circulation type coolant heater with coolant recirculation pump shall be furnished to maintain engine jacket coolant temperature as recommended by manufacturer in an ambient temperature of minus 20°F. The heater shall be 208 VAC, 60 hertz, 3-phase, thermostatically controlled.

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2. The heater shall be of sufficient capacity to keep the coolant at a suitable temperature for trouble-free starting.

3. Each heater shall be provided with a suitable contactor to automatically disconnect the heater when the engine is started.

F. The radiator and/or fan shall be increased in size, as required, to provide cooling of the radiator mounted load bank.

2.10 ENGINE STARTING AND CHARGING SYSTEM

A. Engine starting batteries shall be sealed, lead-acid type, rated 12 volts, wired for 12V or

24V starting. Starting batteries shall have adequate capacity for rolling the engine for five (5), ten (10) second cycles without starting, and then operating the control devices in the local generator controls for two (2) hours. The batteries shall be mounted on a suitable non-corrosive rack which is provided with a battery heating pad that operates at

120VAC or 208VAC. Batteries shall have battery cables with lugs and shall be provided with lugs for connection to the battery charger.

B. Battery charger shall be a U.L. 1236 Listed, automatic, solid-state battery charger, 10 A

(min.) current limited output, ±2% voltage regulation, ±10% line voltage variation, automatic float equalizing system, DC voltmeter, and DC ammeter. Provide a Form C unpowered (dry) contact to indicate a low battery alarm condition.

C. In addition, the engine shall be provided with an engine battery charging alternator that automatically charges the starting batteries during engine operation.

2.11 EXHAUST SILENCER

A. Furnish and install an exhaust silencer. Silencers shall be of critical type and sized to produce a high degree of silencing. Reference the sound attenuation requirements specified herein.

B. Silencer shall be mounted within or exterior to the generator enclosure dependent on generator size and manufacturers standards. Silencers mounted on the outside of the enclosure shall be 316 stainless steel construction on its interior and exterior. Silencers mounted within the generator enclosure shall be painted steel and insulated using a calcium silicate material covered by a brushed aluminum skin.

C. Connect the silencer to the engine exhaust manifold with a high corrosion and temperature resistant stainless steel flexible convoluted exhaust pipe. Use flange-type connections. Provide a taper-cut tail pipe complete with rain cap to exhaust the gases to the atmosphere. The silencer system shall be designed, furnished, and installed to prevent moisture and condensation from corroding the silencer. All exterior components of the exhaust system shall be made of 316 stainless steel.

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D. The silencer (if installed inside), exhaust piping, and expansion fittings, including collector box, shall be completely covered with a removable insulation blanket in order to protect operating personnel and to reduce noise. Insulation shall be of composite fiberglass and stainless steel construction capable of withstanding 1200°F continuously.

The insulation blankets shall be tailored and custom fabricated to fit the contours of the manifolds. Average weight of the insulating blanket shall be 1.5 psf. Insulation shall conform to MIL-1-16411D, Type II and shall be custom fabricated to fit the contours of the components.

2.12 WIRING AND CONDUIT

A. Furnish and install internal wiring in the engine-generator set. All internal wiring between the generator and engine-generator control panel, the on-board power source and all accessories shall be provided.

B. Low Voltage Conductors and Cables

1. Power and control wire shall consist of insulated copper conductors with a nylon

(or equivalent) outer jacket. Conductor insulation shall be rated 90C for dry locations, and 75C for wet locations, and 600V. Insulated conductors shall be UL

83 Listed as NEC Type THHN/THWN. Power conductor size shall be no smaller than No. 12 AWG and Control conductor size shall be no smaller than No. 14

AWG.

2. Multi-conductor cable assemblies shall include a grounding conductor and an overall PVC jacket. The jacket shall be PLC and resistant to abrasion, sunlight, and flame in accordance with UL 1277. Multi-conductor assemblies shall be UL

1277 Listed as NEC Type TC (Power and Control Tray Cable).

3. Conductor Identification

a. 120/208V AC Power

1) Phase A – BLACK

2) Phase B – RED

3) Phase C – BLUE

4) Neutral – WHITE

b. DC Power

1) Positive Lead – RED

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2) Negative Lead – BLACK

c. DC Control

1) All wiring – BLUE

d. 120V AC Control

1) All wiring – RED

e. 24V AC Control

1) All wiring – ORANGE

f. Equipment Grounding Conductor

1) All wiring – GREEN

4. Individual conductors shall have factory color coded insulation.

5. Conductors that are part of multi-conductor cable assemblies shall have black insulation. The conductor number shall be printed on each conductor’s insulation in accordance with ICEA S-58-679, Method 4. Each conductor shall be identified with a heat shrink tag with color coded background.

6. In addition to the color-coding identification requirements specified in this Section, individual conductors shall be provided with heat shrinkable identification tags.

Identification tags for individual conductors shall have a white background where the conductor insulation is colored. Identification tags for individual conductors shall have a colored background where the conductor insulation is black.

Background color shall match that of the taping provided on the individual black conductors.

C. Conduit for Electrical Systems

1. Exposed conduit shall be rigid aluminum.

a. Conduit shall be made of heavy wall high strength 6063 alloy aluminum with temper designation T1 as defined by the Aluminum Association. Conduit shall be manufactured in accordance with ANSI C80.5 and shall be UL 6A

Listed.

b. Conduit shall be provided with factory-cut 3/4 inch per foot tapered threads at each end in accordance with ANSI B1.20.1. Threads shall be cut prior to galvanizing to ensure corrosion protection adequately protects the threads.

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Conduit shall be provided with a matching coupling on one end and a color-coded thread protector on the other.

c. Conduit bodies shall be constructed of copper-free aluminum which is coated with an aluminum enamel finish. Conduit bodies shall have integral threaded conduit hubs.

d. Conduit bodies shall be provided with stamped copper-free aluminum covers that are affixed in place by Type 316 stainless steel screws which thread directly into the conduit body. Covers that utilize wedge nuts or any other method of attachment to the conduit body are not acceptable. Covers shall be provided with matching gasket.

e. Couplings and nipples shall be threaded and shall be constructed of heavy wall high strength 6063 alloy aluminum with temper designation T1. Split-type couplings that use compression to connect conduits are not acceptable.

f. Unions shall be threaded, rain-tight, and constructed of copper-free aluminum which is coated with an aluminum enamel finish.

g. Conduit expansion fittings and conduit deflection fittings shall be constructed of copper-free aluminum which is coated with an aluminum enamel finish.

Expansion and deflection fittings shall have threaded conduit connections.

h. Expansion fittings shall have an integral bonding jumper and deflection fittings shall have an external bonding jumper.

i. Conduit hubs shall be constructed of copper-free aluminum and shall have threaded connections to the conduit and enclosure. Hubs shall have a plastic insulated throat and shall be watertight when assembled to an enclosure.

j. Conduit locknuts shall be constructed of copper-free aluminum. Locknuts shall have internal threading. Locknuts with integral gasket or seal are not acceptable. Locknuts shall have integral bonding screw where required for proper bonding.

k. Conduit bonding bushings shall be constructed of copper-free aluminum.

Bonding bushings shall have a threaded conduit connection. Bonding bushing shall be provided with properly sized set screw for connecting bonding conductor and an integral plastic insulator rated for 150 degrees C located in the throat.

2.13 BASE MOUNTED FUEL TANK

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A. The generator set shall be supplied with a U.L.-142 listed base mounted fuel tank of sufficient capacity to operate the engine-generator set at full load for a minimum of 120 hours. The tank, painted in a color as selected by the Owner, shall be fabricated from steel with a rupture basin and leak detection system. The alarm and indicator for the leak detection shall be mounted adjacent to the generator control panel and a contact for remote indication of a fuel leak condition shall be provided. This contact shall be wired as part of a common "Generator System Failure" alarm.

B. A level device shall also be furnished and installed to provide a local (generator control panel) and remote indication of pre-low fuel tank level and low fuel tank level. The pre-low fuel tank level shall activate a set of dry contacts for remote alarm indication. The low fuel tank level alarm shall shut down the engine to prevent the fuel level from dropping below the fuel pickup piping in the fuel tank. The pre-low fuel level alarm shall activate when only 30 hours of fuel for full load operation remains in the fuel tank. The remote low fuel tank level alarm shall be wired separate from the "Generator System

Failure" alarm. A separate level device shall be furnished and installed to provide an analog remote indication of the fuel level in the tank. Level device shall have a 4-20mA output.

C. The tank shall be supplied with all necessary fuel supply, return, vent, and fill fittings and a fuel level gauge. The lockable fill port and level gauge shall be easily accessible from outside the enclosure. Provide a valve that automatically closes the fuel fill inlet when the tank level reaches 95% of its capacity. The vent line shall be piped to the outside and be equipped with a fill whistle. Four (4) spare 2-inch (minimum) ports shall be provided on top of the tank for future use, two (2) on each long side of the generator.

D. The underside of the tank shall not be in contact with the mounting surface (concrete pad).

2.14 FBC HVHZ APPROVED, WEATHERPROOF ENGINE - GENERATOR ENCLOSURE

A. Furnish and install an outdoor, Florida Building Code (FBC) High Velocity Hurricane

Zone (HVHZ) approved, sound attenuating, weather-protective housing for each engine-generator. The housing shall be furnished complete with a full sub-base floor resulting in complete enclosure. The enclosure shall be factory-assembled to the engine-generator set base and radiator cowling. Lifting eyes shall be provided. Housing shall provide ample airflow for generator set operation. The housing shall be constructed of 12-gauge

(minimum) aluminum or 14 gauge (minimum) galvanized steel, reinforced to be vibration free in the operating mode. The housing shall have hinged side-access doors and rear control panel access door. Each door shall have at least two latch-bearing points. All doors shall be lockable. All steel sheet metal shall be primed for corrosion protection and finish painted in a color as selected by the Owner. Roof shall be peaked to allow drainage of rain water. Unit shall have sufficient guards to prevent entrance by small animals. Batteries shall fit inside enclosure and alongside the engine (batteries under the

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generator are not acceptable). Unit shall have engine coolant and oil drains piped to outside the unit to facilitate maintenance. Each drain line shall have a valve located near the fluid source.

B. The generator enclosure shall be certified by a Professional Engineer licensed in the

State of Florida and shall be designed and constructed to withstand the applicable ASCE

7 load combinations for its installed location. The enclosure shall be large missile impact-rated in accordance with FBC 1626 for Risk Category IV – Essential Facility buildings or structures. Prior to delivery to the site, all drawings and structural calculations shall be digitally signed and sealed in compliance with FAC 61G15-23.004.

C. A “Skin-tight” housing shall be provided. No walk-around access is required within the enclosure; however, adequate working clearance shall be provided as required by the

NEC. Alternatively, access doors may be provided so that when opened, adequate working clearance is achieved in front of electrical equipment.

D. Enclosure shall be sound attenuated to provide sound level as specified herein.

E. The enclosure shall be furnished with a combination power unit as specified herein. This unit shall serve as the power distribution panel for all accessories specified herein and indicated on the…