A5.2-200kW Diesel Generator Spec.pdf

BKTZ22001

04.12.24 300 KW DIESEL GENERATOR 26 32 13-1

SECTION 26 32 13

200Kw DIESEL GENERATOR

PART 1 - GENERAL

1.1 Summary

A. Section Includes:

1. Engine.

2. Diesel fuel system.

3. Control and monitoring.

4. Generator overcurrent and fault protection.

5. Generator, exciter, and voltage regulator.

6. Outdoor generator-set enclosure.

7. Vibration isolation devices.

1.2 Action Submittals

A. Product Data: For each type of product.

1. Include rated capacities, operating characteristics, electrical characteristics, and furnished specialties and accessories.

2. Include thermal damage curve for generator.

3. Include time-current characteristic curves for generator protective device.

4. Include fuel consumption in gallons per hour at 0.8 power factor at 0.5, 0.75-, and 1.0 times generator capacity.

5. Include generator efficiency at 0.8 power factor at 0.5, 0.75-, and 1.0-times generator capacity.

6. Include air flow requirements for cooling and combustion air in cfm at 0.8 power factor, with air supply temperature of 95 deg F (35 deg C), Provide drawings indicating requirements and limitations for location of air intake and exhausts.

7. Include generator characteristics, including, but not limited to, kilowatt rating, efficiency, reactance, and short-circuit current capability.

B. Shop Drawings:

1. Include plans and elevations for engine generator and other components specified.

2. Include details of equipment assemblies. Indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

3. Identify fluid drain ports and clearance requirements for proper fluid drain.

4. Design calculations for selecting vibration isolators and seismic restraints and for designing vibration isolation bases.

5. Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to structure and to supported equipment. Include base weights.

6. Include diagrams for power, signal, and control wiring. Complete schematic, wiring, and interconnection diagrams indicating terminal markings for EPS equipment and functional relationship between all electrical components.

1.3 Informational Submittals

A. Warranty: For special warranty.

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1.4 Closeout Submittals

A. Operation and Maintenance Data: For engine generators to include in emergency, operation, and maintenance manuals.

1.5 Maintenance Material Submittals

A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Fuses: One for every 10 of each type and rating, but no fewer than one of each.

2. Indicator Lamps: Two for every six of each type used, but no fewer than two of each.

3. Filters: One set each of lubricating oil, fuel, and combustion-air filters.

4. Tools: Each tool listed by part number in operations and maintenance manual.

1.6 Quality Assurance

A. Manufacturer Qualifications: Current certificate holder for compliance with ISO 9001.

B. Installer Qualifications: An authorized representative who is trained and approved by manufacturer.

1.7 Warranty

A. Manufacturer's Warranty: Manufacturer agrees to repair or replace components of packaged engine generators and associated auxiliary components that fail in materials or workmanship within specified warranty period.

1. Warranty Period: 5 years from date of startup, to include parts, labor, and travel.

PART 2 - PRODUCTS

2.1 Manufacturers

A. Source Limitations: Obtain packaged engine generators and auxiliary components through one source from a single manufacturer.

2.2 Performance Requirements

A. NFPA Compliance:

1. Comply with NFPA 37.

2. Comply with NFPA 70.

3. Comply with NFPA 110 requirements for Level 2 EPSS.

B. UL Compliance: Comply with UL 2200.

C. Engine Exhaust Emissions: Comply with EPA requirements and applicable state and local government requirements.

D. Noise Emission: Comply with applicable state and local government requirements for maximum noise level at adjacent property boundaries due to sound emitted by engine generator including engine, engine exhaust, engine cooling-air intake and discharge, and other components of installation.

E. Environmental Conditions: Engine generator system shall withstand the following environmental conditions without mechanical or electrical damage or degradation of performance capability:

1. Ambient Temperature: 41 to 104 deg F (5 to 40 deg C) below for outdoor units.

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2. Relative Humidity: Zero to 95 percent.

3. Altitude: Sea level to 2000 ft. (610 m)

2.3 Engine Generator Assembly Description

A. Factory-assembled and -tested, water-cooled engine, with brushless generator and accessories.

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a testing agency acceptable to authorities having jurisdiction, and marked for intended location and use.

C. Power Rating: Standby. 200kW, Power Factor: 0.8, lagging.

D. Voltage: 208 V ac., Phase: Three-phase, Frequency: 60 Hz.

E. Governor: Adjustable isochronous, with speed sensing.

F. Mounting Frame: Structural steel framework to maintain alignment of mounted components without depending on concrete foundation. Provide lifting attachments sized and spaced to prevent deflection of base during lifting and moving.

G. Capacities and Characteristics:

1. Power Output Ratings: Nominal ratings as indicated at 0.8 power factor excluding power required for the continued and repeated operation of the unit and auxiliaries, with capacity as required to operate as a unit as evidenced by records of prototype testing.

2. Nameplates: For each major system component to identify manufacturer's name and address, and model and serial number of components.

H. Engine Generator Performance:

1. Steady-State Voltage Operational Bandwidth: 3 percent of rated output voltage from no load to full load.

2. Transient Voltage Performance: Not more than 20 percent variation for 50 percent step-load increase or decrease. Voltage shall recover and remain within the steady-state operating band within three seconds.

3. Steady-State Frequency Operational Bandwidth: 0.5 percent of rated frequency from no load to full load.

4. Steady-State Frequency Stability: When system is operating at any constant load within the rated load, there shall be no random speed variations outside the steady-state operational band and no hunting or surging of speed.

5. Transient Frequency Performance: Less than 5 percent variation for 50 percent step-load increase or decrease. Frequency shall recover and remain within the steady-state operating band within five seconds.

6. Output Waveform: At no load, harmonic content measured line to line or line to neutral shall not exceed 5 percent total and 3.5 percent for single harmonics. Telephone influence factor, determined in accordance with NEMA MG 1, shall not exceed 50 percent.

7. Sustained Short-Circuit Current: For a three-phase, bolted short circuit at system output terminals, system shall supply a minimum of 300 percent of rated full-load current for not less than 10 seconds and then clear the fault automatically, without damage to generator system components.

8. Start Time: 10 seconds start time.

2.4 Diesel Engine

A. Fuel: ASTM D975, diesel fuel oil, Grade 2-D S15.

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1. Off road, Ultra low Sulphur diesel fuel (15ppm.)

B. Rated Engine Speed: 1800 rpm.

C. Lubrication System: Engine or skid mounted.

1. Filter and Strainer: Rated to remove 90 percent of particles 5 micrometers and smaller while passing full flow.

2. Thermostatic Control Valve: Control flow in system to maintain optimum oil temperature. Unit shall be capable of full flow and is designed to be fail-safe.

3. Crankcase Drain: Arranged for complete gravity drainage to an easily removable container with no disassembly and without use of pumps, siphons, special tools, or appliances.

D. Jacket Coolant Heater: Electric-immersion type, factory installed in coolant jacket system.

Comply with UL 499 for heater capacity. 120V Single Phase.

E. Integral Cooling System: Closed loop, liquid cooled, with radiator factory mounted on engine generator mounting frame and integral engine-driven coolant pump.

1. Coolant: Solution of 50 percent ethylene-glycol-based antifreeze and 50 percent water, with anticorrosion additives as recommended by engine manufacturer.

2. Size of Radiator: Adequate to contain expansion of total system coolant from cold start to 110 percent load condition.

3. Expansion Tank: Constructed of welded steel plate and rated to withstand maximum closed-loop coolant system pressure for engine used. Equip with gauge glass and petcock.

4. Temperature Control: Self-contained, thermostatic-control valve modulates coolant flow automatically to maintain optimum constant coolant temperature as recommended by engine manufacturer.

5. Maximum Ambient Operating Temperature: 104 deg F (40 deg C).

6. Coolant Hose: Flexible assembly with inside surface of nonporous rubber and outer covering of aging-, ultraviolet-, and abrasion-resistant fabric.

a. Rating: 50-psig (345-kPa) maximum working pressure with coolant at 180 deg F

(82 deg C), and no collapsible under vacuum.

b. End Fittings: Flanges or steel pipe nipples with clamps to suit piping and equipment connections.

F. Muffler/Silencer:

1. Critical type sized as recommended by engine manufacturer and selected with exhaust piping system to not exceed engine manufacturer's engine backpressure requirements.

a. Sound level measured at 23 ft. (7 m) from exhaust discharge after installation is complete shall be 75 dBA or less.

G. Air-Intake Filter: Standard-duty, engine-mounted air cleaner with replaceable dry-filter element and "blocked filter" indicator.

H. Starting System: 12 or 24vdc electric, with negative ground.

1. Components: Sized so they are not damaged during a full engine-cranking cycle with ambient temperature at maximum specified in "Performance Requirements" Article.

2. Cranking Motor: Heavy-duty unit that automatically engages and releases from engine flywheel without binding. Cranking Cycle: As required by NFPA 110 for system level specified.

3. Battery: Lead acid, with capacity within ambient temperature range specified in "Performance Requirements" Article to provide specified cranking cycle at least three times without recharging.

4. Battery Cable: Size as recommended by engine manufacturer for cable length indicated. Include required interconnecting conductors and connection accessories.

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5. Battery-Charging Alternator: Factory mounted on engine with solid-state voltage regulation and 35 A minimum continuous rating.

6. Battery Charger: Current-limiting, automatic-equalizing and float-charging type designed for lead-acid batteries. Unit shall comply with UL 1236 and include the following features:

a. Charging Rate: Automatic 10-A, dual rate float/equalize with reverse polarity protection.

b. Charging current output measured by generator controller to support remote monitoring and diagnostics.

c. Factory installed on engine-generator. Due to voltage drop concerns, transfer-switch-mounted battery chargers are not acceptable.

d. Automatic Voltage Regulation: Maintain constant output voltage regardless of input voltage variations up to plus or minus 10 percent.

e. Safety Functions: Sense abnormally low battery voltage and close contacts providing low battery voltage indication on control and monitoring panel. Sense high battery voltage and loss of ac input or dc output of battery charger. Either condition shall close contacts that provide a battery-charger malfunction indication at system control and monitoring panel.

f. Enclosure and Mounting: NEMA 250, Type 1, wall-mounted cabinet.

2.5 Diesel Fuel-Oil System

A. Comply with NFPA 37.

B. Main Fuel Pump: Mounted on engine to provide primary fuel flow under starting and load conditions.

C. Fuel Filtering: Remove water and contaminants larger than 2 microns.

D. Relief-Bypass Valve: Automatically regulates pressure in fuel line and returns excess fuel to source.

E. Subbase-Mounted, Double-Wall, Fuel-Oil Tank: Factory installed and piped, complying with UL 142 fuel-oil tank. Features include the following:

1. Tank level indicator.

2. Fuel-Tank Capacity: Fuel required for 48 hours operation.

3. Leak detection in interstitial space.

4. Low-Level Alarm Sensor: Liquid-level device operates alarm contacts at 25 percent of normal fuel level.

5. High-Level Alarm Sensor: Liquid-level device operates alarm and redundant fuel shutoff contacts at midpoint between overflow level and 90 percent of normal fuel level.

6. Vandal-resistant fill cap.

2.6 Control And Monitoring

A. Automatic Starting System Sequence of Operation: When mode-selector switch on the control and monitoring panel is in the automatic position, remote-control contacts in one or more separate automatic transfer switches initiate starting and stopping of engine generator.

When mode-selector switch is switched to the on position, engine generator starts. The off position of same switch initiates generator-set shutdown. When engine generator is running, specified system or equipment failures or derangements automatically shut down engine generator and initiate alarms.

B. Fully integrated microprocessor-based control system specifically designed for standby emergency engine generators.

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C. Fully integrated control system enabling remote diagnostics and easy building management integration of all generator functions. The generator controller shall provide integrated and digital control over all generator functions, including engine protection, alternator protection, speed governing, voltage regulation, synchronizing, load-sharing (real and reactive), and all related generator operations. The generator controller must also provide seamless digital integration with the engine's electronic engine control module (ECM) if so equipped.

D. Control panel shall comply with UL 6200.

E. Remote Connectivity: User interface available both internally and externally to the user's network, based on network security preferences. All remote connectivity may be disabled at any time by the user.

F. Automated Notification: Controller capable of sending multiple automated e-mail and SMS alerts without intermediate service provider.

G. Notification Customization: User configurable allowing any operational or fault condition to initiate notification to any personnel including (but not limited to) generator service provider.

H. Environmentally Hardened Design: Open circuit boards, edge cards, and PC ribbon cable connections are unacceptable.

I. Circuit boards with surface-mounted components to provide vibration durability. Circuit boards utilizing large capacitors or heat sinks must utilize encapsulation methods to securely support these components.

J. Configuration:

1. Operating and safety indications, protective devices, basic system controls, and engine gauges shall be grouped in a common control and monitoring panel mounted on the engine generator. Mounting method shall isolate the control panel from generator-set vibration. Panel shall be powered from the engine generator battery.

K. Control and Monitoring Panel:

1. Digital controller with integrated touch screen, controls, and microprocessor, capable of local and remote control, monitoring, and programming, with battery backup.

2. Instruments: Located on the control and monitoring panel and viewable during operation.

a. Engine lubricating-oil pressure gauge.

b. Engine-coolant temperature gauge.

c. DC voltmeter (alternator battery charging).

d. Running-time meter.

e. AC voltmeter, for each phase.

f. AC ammeter, for each phase.

g. AC frequency meter.

h. Generator-voltage adjusting feature.

3. Controls and Protective Devices: Controls, shutdown devices, and common visual alarm indication, including the following:

a. Cranking control equipment.

b. Run-Off-Auto switch.

c. Control switch not in automatic position alarm.

d. Overcrank alarm.

e. Overcrank shutdown device.

f. Low water temperature alarm.

g. High engine temperature prealarm.

h. High engine temperature.

i. High engine temperature shutdown device.

j. Overspeed alarm.

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k. Overspeed shutdown device.

l. Coolant low-level alarm.

m. Coolant low-level shutdown device.

n. Coolant high-temperature pre-alarm.

o. Coolant high-temperature alarm.

p. Coolant low-temperature alarm.

q. Coolant high-temperature shutdown device.

r. EPS supplying load indicator.

s. Battery high-voltage alarm.

t. Low cranking voltage alarm.

u. Battery-charger malfunction alarm.

v. Battery low-voltage alarm.

w. Lamp test.

x. Contacts for local and remote common alarm.

y. Hours of operation.

z. Engine generator metering, including voltage, current, Hz, kW, kVA, and power factor.

aa. Generator overcurrent protective device not closed alarm.

L. Connection to Datalink:

1. A separate terminal block, factory wired to Form C dry contacts, for each alarm and status indication.

2. Provide connections for datalink transmission of indications to remote data terminals via Ethernet.

M. Remote Alarm Annunciator: An LED indicator light labeled with proper alarm conditions shall identify each alarm event, and a common audible signal shall sound for each alarm condition.

Silencing switch in face of panel shall silence signal without altering visual indication. Connect so that after an alarm is silenced, clearing of initiating condition will reactivate alarm until silencing switch is reset. Cabinet and faceplate are surface- or flush-mounting type to suit mounting conditions indicated.

1. Overcrank alarm.

2. Coolant low-temperature alarm.

3. High engine temperature prealarm.

4. High engine temperature alarm.

5. Low lube oil pressure alarm.

6. Overspeed alarm.

7. Low coolant level alarm.

8. Low cranking voltage alarm.

9. Contacts for local and remote common alarm.

10. Audible-alarm silencing switch.

11. Air shutdown damper when used.

12. Run-Off-Auto switch.

13. Control switch not in automatic position alarm.

14. Fuel tank derangement alarm.

15. Fuel tank high-level shutdown of fuel supply alarm.

16. Lamp test.

17. Low cranking voltage alarm.

18. Generator overcurrent protective device not closed.

N. Supporting Items: Include sensors, transducers, terminals, relays, and other devices and include wiring required to support specified items. Locate sensors and other supporting items on engine or generator, unless otherwise indicated.

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2.7 Generator Overcurrent and Fault Protection

A. Overcurrent protective devices shall be coordinated to optimize selective tripping when a short circuit occurs.

B. Generator Overcurrent Protective Device:

1. Molded-case circuit breaker, electronic-trip type; 100 percent rated; complying with

UL 489:

a. Output breaker: 600 amp, 3 pole.

b. Tripping Characteristics: Adjustable long-time and short-time delay and instantaneous.

c. Trip Settings: Selected to coordinate with generator thermal damage curve.

d. Shunt Trip: Connected to trip breaker when engine generator is shut down by other protective devices.

e. Mounting: Adjacent to or integrated with control and monitoring panel.

C. Generator Protector: Integrated controller base unit shall continuously monitor current level in each phase of generator output, integrate generator heating effect over time, and predict when thermal damage of alternator will occur. When signaled by generator protector or other generator-set protective devices, a shunt-trip device in the generator disconnect switch shall open the switch to disconnect the generator from load circuits. Protector performs the following functions:

1. Initiates a generator overload alarm when generator has operated at an overload equivalent to 110 percent of full-rated load for 60 seconds. Indication for this alarm is integrated with other generator-set malfunction alarms. Contacts shall be available for load shed functions.

2. Under single or three-phase fault conditions, regulates generator to 300 percent of rated full-load current for up to 10 seconds.

3. As overcurrent heating effect on the generator approaches the thermal damage point of the unit, protector switches the excitation system off, opens the generator disconnect device, and shuts down the engine generator.

4. Senses clearing of a fault by other overcurrent devices and controls recovery of rated voltage to avoid overshoot.

D. Ground-Fault Indication: Comply with NFPA 70, "Emergency System" signals for ground fault.

1. Indicate ground fault with other engine generator alarm indications.

2. Trip generator protective device on ground fault.

2.8 Generator, Exciter, and Voltage Regulator

A. Comply with NEMA MG 1.

B. Drive: Generator shaft shall be directly connected to engine shaft. Exciter shall be rotated integrally with generator rotor.

C. Electrical Insulation: Class H.Twelve lead alternator in "Stator-Winding Leads" Paragraph below is also known as a "reconnectable" alternator because the leads can be reconnected in the field in series or parallel to change between delta and wye configurations.

D. Stator-Winding Leads: Brought out to terminal box to permit future reconnection for other voltages if required.

E. Range: Provide broad range of output voltage by adjusting the excitation level.

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F. Construction shall prevent mechanical, electrical, and thermal damage due to vibration, overspeed up to 125 percent of rating, and heat during operation at 110 percent of rated capacity.

G. Enclosure: Drip proof.

H. Instrument Transformers: Mounted within generator enclosure.

I. Voltage Regulator: Solid-state type, separate from exciter, providing performance as specified.

1. Voltage Adjustment on Control and Monitoring Panel: Provide plus or minus 5 percent adjustment of output-voltage operating band.

2. Maintain voltage within 20 percent on one step.

3. Provide anti-hunt provision to stabilize voltage.

4. Maintain frequency within 10 percent and stabilize at rated frequency within 5 seconds.

J. Windings: Two-thirds pitch stator winding and fully linked amortisseur winding.

K. Sub-transient Reactance: 15 percent, maximum based on the rating of the engine generator set.

L. Starting Capabilities: 770 sKVA at 30% maximum voltage dip. 90% sustained voltage measurement is unacceptable.

M. Permanent magnet brushless excitation (PMG).

1. PMG shall derive excitation current from pilot exciter mounted on the rotor shaft. It is to be able to sustain 300% of rated current for ten seconds during a fault condition.

2. Self-excited system to be brushless and consist of a 3 Ph armature and a 3 Ph full wave bridge rectifier mounted on the rotor shaft. Include surge suppressors to protect the diodes.

3. From voltage spikes.

4. Capable of sustaining 300% overcurrent for 10 seconds under a 3 Ph symmetrical short circuit

2.9 Outdoor Generator-Set Enclosure

A. Generator packaged within level 2 (72dBA @ 23 ft) enclosure.

B. Sound Insulation: Enclosure and air discharge hood completely lined with 3 inches (76 mm) of fiberglass and perforated aluminum.

C. Enclosure Construction: Minimum 14 gauge steel with hinged, removable doors to allow access to the engine, alternator, and control panel. Adjustable hinges to allow for door alignment. Hinges and all exposed fasteners must be stainless steel. Pop-rivets weaken the paint system and are not allowed on external painted surfaces. Each door will be equipped with lockable hardware and identical keys.

D. Upward discharging enclosure ventilation exhaust hood.

E. Enclosure Finish: Electrostatic applied powered paint, baked and finished to manufacturer's specifications.

F. Enclosure Color: Manufacturer’s standard.

G. Silencer mounted within enclosure.

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H. Engine Cooling Airflow through Enclosure: Maintain temperature rise of system components within required limits when unit operates at 110 percent of rated load for 2 hours with ambient temperature at top of range specified in system service conditions.

1. Louvers: Fixed-engine, cooling-air inlet and discharge. Storm-proof and drainable louvers prevent entry of rain and snow.

I. Convenience Outlets: Factory wired, GFCI. Arrange for external electrical connection.

2.10 Vibration Isolation Devices

A. Elastomeric Isolator Pads: Oil- and water-resistant elastomer or natural rubber, arranged in single or multiple layers, molded with a nonslip pattern and galvanized-steel baseplates of sufficient stiffness for uniform loading over pad area, and factory cut to sizes that match requirements of supported equipment.

B. Vibration isolation devices shall not be used to accommodate misalignments or to make bends.

2.11 Finishes

A. Indoor and Outdoor Enclosures and Components: Manufacturer's standard finish over corrosion-resistant pretreatment and compatible primer.

B. Powder Coated Paint Surfaces:

1. Minimum Paint Thickness: 2.5 mil (0.06 mm) in accordance with ASTM D1186-87.

2. Material Hardness: ASTM D3363-92a.

3. Resistance to Cracking: ASTM D522-B.

4. Paint Adhesion: ASTM D3359-B.

5. Resistance to Saltwater Corrosion: ASTM B117, ASTM D1654.

6. Resistance to Humidity: ASTM D1735, ASTM D1654.

7. Impact Resistance: ASTM 2784.

8. UV Protection: SAE J1690.

2.12 Source Quality Control

A. Prototype Testing: Factory test engine generator using same engine model, constructed of identical or equivalent components and equipped with identical or equivalent accessories.

1. Tests: Comply with IEEE 115.

B. Project-Specific Equipment Tests: Before shipment, factory test engine generator and other system components and accessories manufactured specifically for this Project. Perform tests at rated load and power factor. Include the following tests:

1. Test components and accessories furnished with installed unit that are not identical to those on tested prototype to demonstrate compatibility and reliability.

2. Test generator, exciter, and voltage regulator as a unit.

3. Full load run.

4. Maximum power.

5. Voltage regulation.

6. Transient and steady-state governing.

7. Single-step load pickup.

8. Safety shutdown.

9. Report factory test results within 10 days of completion of test.

PART 3 - EXECUTION

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3.1 Examination

A. Examine areas, equipment bases, and conditions, with Installer present, for compliance with requirements for installation and other conditions affecting packaged engine generator performance.

B. Examine roughing-in for piping systems and electrical connections. Verify actual locations of connections before packaged engine generator installation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 Preparation

A. Interruption of Existing Electrical Service: Do not interrupt electrical service to facilities occupied by Government or others unless permitted under the following conditions and then only after arranging to provide temporary electrical service in accordance with requirements indicated:

1. Notify Government no fewer than two working days in advance of proposed interruption of electrical service.

2. Do not proceed with interruption of electrical service without Governments written permission.

3.3 Installation

A. Comply with NECA 1 and NECA 404.

B. Comply with packaged engine generator manufacturers' written installation and alignment instructions.

C. Equipment Mounting:

1. Install packaged engine generators on cast-in-place concrete equipment bases.

Comply with requirements for equipment bases and foundations specified in Division 03, Section "Cast-in-Place Concrete."

2. Coordinate size and location of concrete bases for packaged engine generators. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified with concrete.

D. Install packaged engine generator to provide access, without removing connections or accessories, for periodic maintenance.

E. Electrical Wiring: Install electrical devices furnished by equipment manufacturers but not specified to be factory mounted.

3.4 Connections

A. Piping installation requirements are specified in other Sections. Drawings indicate general arrangement of piping and specialties.

B. Ground equipment in accordance with Section 26 05 26 "Grounding and Bonding for Electrical Systems."

C. Connect wiring in accordance with Section 26 05 19 "Low-Voltage Electrical Power Conductors and Cables." Provide a minimum of one 90-degree bend in flexible conduit routed to the engine generator from a stationary element.

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D. Balance single-phase loads to obtain a maximum of 10 percent unbalance between any two phases.

3.5 Identification

A. Identify system components in accordance with Section 26 05 53 "Identification for Electrical Systems."

B. Install a sign indicating the generator neutral is bonded to the main service neutral at the main service location.

3.6 Field Quality Control

A. Testing Agency:

1. Engage a qualified testing agency to perform tests and inspections.

2. Engage a factory-authorized service representative to test and inspect components, assemblies, and equipment installations, including connections.

3. Perform tests and inspections with the assistance of a factory-authorized service representative.

B. Tests and Inspections:

1. Perform tests recommended by manufacturer and each visual and mechanical inspection and electrical and mechanical test listed in the first two subparagraphs below as specified.

a. Visual and Mechanical Inspection:

1) Compare equipment nameplate data with drawings and specifications.

2) Inspect physical and mechanical condition.

3) Inspect anchorage, alignment, and grounding.

4) Verify the unit is clean.

5) Test protective relay devices.

6) Verify phase rotation, phasing, and synchronized operation as required by the application.

7) Functionally test engine shutdown for low oil pressure, overtemperature, overspeed, and other protection features as applicable.

8) Perform vibration test for each main bearing cap.

9) Verify correct functioning of the governor and regulator.

2. Testing to include cold start, 25, 50, 75, and 100% step loads (slow addition of load to confirm operation),

3. 4 hour testing at rated nameplate.

4. Loading shall be by resistive load bank.

5. Battery Tests: Equalize charging of battery cells in accordance with manufacturer's written instructions. Record individual cell voltages.

a. Measure charging voltage and voltages between available battery terminals for full-charging and float-charging conditions. Check electrolyte level and specific gravity under both conditions.

b. Test for contact integrity of all connectors. Perform an integrity load test and a capacity load test for the battery.

c. Verify acceptance of charge for each element of the battery after discharge.

d. Verify that measurements are within manufacturer's specifications.

6. Battery-Charger Tests: Verify specified rates of charge for both equalizing and float-charging conditions.

7. System Integrity Tests: 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.

8. Exhaust Emissions Test: Comply with applicable government test criteria.

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9. Voltage and Frequency Transient Stability Tests: Use recording oscilloscope to measure voltage and frequency transients for 50 and 100 percent step-load increases and decreases and verify that performance is as specified.

10. Harmonic-Content Tests: Measure harmonic content of output voltage at 25 percent and 100 percent of rated linear load. Verify that harmonic content is within specified limits.

C. Coordinate tests with tests for transfer switches and run them concurrently.

D. Test instruments shall have been calibrated within the last 12 months, traceable to NIST Calibration Services, and adequate for making positive observation of test results.

E. Leak Test: After installation, charge exhaust, coolant, and fuel systems and test for leaks.

Repair leaks and retest until no leaks exist.

F. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation for generator and associated equipment.

G. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

H. Remove and replace malfunctioning units and retest as specified above.

I. Retest: Correct deficiencies identified by tests and observations and retest until specified requirements are met.

J. Report results of tests and inspections in writing. Record adjustable relay settings and measured insulation resistances, time delays, and other values and observations. Attach a label or tag to each tested component indicating satisfactory completion of tests.

3.7 Maintenance Service

A. Initial Maintenance Service: For a period of one-year beginning at Substantial Completion, provide quarterly inspections by skilled employees of manufacturer's designated service organization. Include quarterly exercising to check for proper starting, load transfer, and running under load. Include routine preventive maintenance as recommended by manufacturer and adjusting as required for proper operation. Provide parts and supplies same as those used in the manufacture and installation of original equipment.

3.8 Demonstration & Training

A. Engage a factory-authorized service representative to train Government's maintenance personnel to adjust, operate, and maintain packaged engine generators.

END OF SECTION