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READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[ DIVISION 16: ELECTRICAL]{.underline}

SECTION 16231 - ENGINE GENERATORS

USE: Furnishing and installing engine generators and associated
equipment to provide temporary power to essential electrical equipment
due to temporary loss of electrical power.

**NOTES TO SPECIFIER:**

A. Options within paragraphs are identified by enclosure in brackets;
blank spaces enclosed by brackets \[\_\_\_\_\_\] provide for information
to be inserted, as appropriate, to individual projects.

B. **TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES,** the
specifier must edit (delete, substitute or add to the text). The
remaining paragraphs must be renumbered.

C. DELETE FOR FINAL COPY: Notes to the Specifier, located between lines
of asterisks; all \[brackets\], [underlining]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (Corel 8). **ENTIRE FOOTER SHOULD
BE BOLDED.** Click in the footer and delete the "Project Name (ftr B)"
text and replace it with the **Name of the Project (upper and lower
case)**. Replace date with current MM/YY (WITHOUT BRACKETS).

E. The Guide Specifications are intended to be continuously reviewed and
revised. User's technical comments are appreciated. Also, other related
or similar specification that are written "from scratch" that could
benefit others, or other questions can be sent to NSTC A/E Group, ST
110, or call (303) 987-6868.

**DRAWING DATA REQUIRED:**

**REVISIONS OF THIS SECTION:**

CSI format, editorial changes: 12/01

Metric:

Technical Update: 2/97

**SECTION 16231 **

**ENGINE GENERATORS**

**[PART 1: GENERAL]{.underline}**

**1.1 SUMMARY**

** A. Section Includes: \[Furnishing\] \[and\] \[installing\] \[diesel\]
\[gasoline\] engine generator sets and associated equipment for
\[power,\] \[lighting,\] \[and\] \[air conditioning\] for \[computer
facilities\] \[data link facilities\] \[communication facilities\]
\[security systems\] \[\_\_\_\_\_\].**

**1.2 SUBMITTALS**

** A. General: Submittals shall be according to \[Section 01009 -
General Information and Requirements.\] \[Section 01300 - Submittals.\]
\[Section 01365 - Certificates of Conformance.\]**

** B. Manufacturer\'s Literature: Submit \[\_\_\_\_\_\] copies of the
manufacturer's descriptive data for the engine generator and accessories
to be used on this project. The literature shall include rated KVA,
rated KW, output voltage, and standard published data. Include data on
all subsystems such as transfer switches, maintenance switches,
batteries, instruments, and controls. Provide scale drawings of the
engine generator equipment and show connections to transfer switches.**

** C. Shop Drawings: Submit \[\_\_\_\_\_\] copies of shop drawings for
engine generators to be used on this project. The shop drawings shall
indicate dimensions, weight loadings, working clearances, fuel
connections, muffler connections, cooling system requirements, and
mounting requirements.**

**1.3 QUALITY ASSURANCE**

** A. Labeling Requirements: The engine generator components shall be
Underwriters Laboratories, Inc. (UL) listed and labeled, where UL
requirements exist. UL listing and labeling will not be required if it
can be shown that the components meet the requirements of another
nationally recognized testing laboratory (NRTL).**

** B. Testing Requirements: The engine generator and attached components
shall be completely factory tested and calibrated as a system prior to
shipment.**

**[PART 2: PRODUCTS]{.underline}**

**2.1 MATERIALS**

** A. General: Engine generators shall be constructed of the
manufacturer\'s standard materials, as listed in published product
information; types and sizes shall be as indicated or as required for
the installation.**

**2.2 EQUIPMENT**

** A. Engine-Generator Set: The engine generator shall be rated
\[\_\_\_\_\_\]KVA, \[\_\_\_\_\_\]KW, 0.8 PF at altitude indicated,
\[120/208 volts, 3 phase, 4 wire,\] \[120/240 volts, 1 phase, 3 wire,\]
\[120/240 volts, 3 phase, 4 wire,\] \[\_\_\_\_\_\_\_\_\_\_,\] 60 Hz on a
continuous standby basis. Engine-generator shall be mounted on heavy
duty steel base to maintain proper alignment between components, and
each set shall incorporate vibration isolators of the type and quantity
recommended by the manufacturer, whether mounted internally or
externally to the set.**

** B. Engine: Shall be stationary, \[gasoline\] \[diesel fuel\] driven,
\[air\] \[liquid\] cooled. Design shall be \[two\] \[four\] cycle,
naturally aspirated, supercharged, or turbocharged and aftercooled where
required by engine manufacturer. Engine shall be certified by the engine
manufacturer as capable of driving a generator yielding the KW rating
specified on a continuous standby basis for the duration of normal
utility source interruptions. Fuel injection and valves shall not
require adjustment while in service. Engine equipment shall include the
following:**

**  1. An electrical starting system designed to operate at \[12\]
\[24\] volts dc with a negative circuit ground. The starting system
shall have an adjustable device to limit cranking periods from 10
seconds up to the maximum duration recommended by the manufacturer.**

** 2. Positive displacement, mechanical full pressure lubrication oil
pump, full flow lubrication oil filters with replaceable elements, and
dipstick oil level indicator.**

** 3. Fuel filter with replaceable element, and an engine driven
mechanical positive displacement fuel pump, all mounted on the engine.**

** 4. Replaceable dry element air cleaner.**

** 5. Engine speed mechanical governing system to automatically control
generator frequency to within 5 percent of rated frequency from no load
to full load rated output.**

** 6. Engine protection devices with sensing elements on the engine to
initiate the following preliminary alarms and engine shutdowns:**

** a. High coolant temperature alarm**

** b. High coolant temperature shutdown**

** c. Low lubrication oil pressure alarm**

** d. Low lubricant oil pressure shutdown**

** e. Over-speed shutdown**

** f. Overcrank lockout**

** 7. Low coolant level shutdown, which shall activate high engine
temperature lamp and shutdown.**

** 8. Engine starter.**

** 9. Normal/routine service points, filters, drains, etc. located so
they are accessible without removing any other components.**

** 10. Two rack mounted starting batteries located within the skidbase
or adjacent to the set.**

** 11. Voltage regulated battery charger equipped with float, taper, and
equalize charge settings. Charger power shall be from the normal power
source.**

** 12. Remote audible annunciator with light emitting diode indicators.
Annunciator shall include the following:**

** a. Overcrank**

** b. Over-speed**

** c. Low fuel**

** d. Low lubricant oil pressure**

** e. High coolant temperature**

** f. Low lubricant oil pressure pre-alarm**

** g. High coolant temperature pre-alarm**

** 13. Branch circuits from normal power source as required.**

** C. Engine Cooling System: Engine shall be radiator cooled by an
engine mounted radiator system including belt-driven pusher fan, coolant
pump, and thermostat temperature control. Performance of components
shall be as recommended by the set manufacturer. Radiators shall be
provided with a duct adapter flange permitting the attachment of an air
duct directing the discharge of radiator air through the wall.**

**  1. The Contractor shall provide 50 percent ethylene glycol
antifreeze solution to fill the engine cooling system.**

** 2. A thermostatically controlled electric heater shall be mounted in
the engine cooling jacket or mounted externally to automatically
maintain the coolant within plus or minus 5 degrees of the control
temperature. The heater shall operate from the \"normal\" electrical
power system and independently of engine operation so that starting
times are minimized and to prevent freezing when the engine-­generator
set is not being operated. The control temperature shall be the
temperature recommended by the engine manufacturer to meet starting time
specified.**

** 3. All louvers, gravity or motorized, and ductwork shall be
constructed of sheet metal to the size and shape required by the
engine-generator manufacturer. Exhaust air from the engine­generator
shall be connected to a duct with flexible transition to the outside
through a damper. All louvers shall be weather-tight and shall include
seals to exclude exterior air infiltration when in the closed
position.**

** D. Engine Exhaust System: An exhaust muffler shall be provided for
the engine, sized as recommended by the set manufacturer. Muffler shall
be of the \[residential\] \[industrial\] type. Mount the muffler so its
weight is not supported by the engine. Provide a flexible connection
between the engine exhaust manifold and the exhaust line.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**DELETE ONE OF THE PARAS BELOW.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

** E. Engine Fuel System: Provide a \[\_\_\_\_\_\] gallon double wall
fuel tank mounted between the steel frame rails, with a heat activated
shut-off valve between the tank and engine. Provide a low fuel supply
sensing device on the fuel tank. The sensing device shall signal low
fuel when the tank contains less than a two hour supply. The two hour
supply shall be as recommended by the manufacturer. Provide fuel fill,
vent lines, and piping system complete with exterior fill (including
spill protection).**

**\*\*\*\* or \*\*\*\***

** E. Engine Fuel System: Provide a \[\_\_\_\_\_\] gallon day tank on
the wall where shown. Tank shall be equipped with duplex high lift fuel
pumps capable of pumping 200 percent of engine fuel consumption at full
load. The day tank shall be provided with connections for fuel supply
line, fuel return line, fuel overflow line, local fuel fill port, gauge,
vent line, fill limit float switch assembly, alarm level sensing device,
and drain line. A fuel return line cooler shall be provided as
recommended by the manufacturer and assembler. The day tank shall be
suitable for seismic zone 3 and shall be equipped with overflow basin
capable of containing 150 percent of tank capacity with switch in basin
to shut off pump and send signal to generator alarm panel.**

** F. Generator: Shall be single-bearing, self-aligning, four-pole,
synchronous type, revolving field, with amortiser windings, direct drive
centrifugal blower for proper cooling and minimum noise, temperature
compensated solid-state voltage regulator, and brushless rotating
rectifier exciter system. The generator shall be directly connected to
the engine flywheel housing and driven through a flexible coupling to
ensure permanent alignment. The maximum temperature rise shall be 100
degrees C. at 40 degrees C. ambient.**

**  1. The three-phase, broad range, reconnectible generator shall have
12 leads brought out to allow connection to obtain any of the available
voltages for the unit.**

** 2. The voltage regulator shall be solid-state design, and shall
function by controlling the exciter magnetic field between stator and
rotor to provide no load to full load regulation of rated voltage within
plus or minus 1 percent during steady-state conditions. The
engine-generator set and regulator must sustain at least 90 percent of
no load voltage for 10 seconds with 250 percent of rated load at near
zero power factor connected to its terminals.**

** 3. The voltage regulator shall be insensitive to severe load induced
waveshape distortion from SCR to thyristor circuits such as those used
in battery charging (UPS) and motor speed control equipment. A rheostat
shall provide a minimum of plus or minus 5 percent voltage adjustment
from rated value.**

** 4. The exciter shall be three-phase, full-wave, rectified, with
heavy-­duty silicon diodes mounted on the common rotor shaft and sized
for maximum motor starting loads.**

** 5. Generator design shall be of the self-correcting type, as
demonstrated by the prototype short-circuit test as described under
\"Testing\". All other generator performance criteria shall be equal to
that of the specified equipment.**

** G. Engine Generator Set Control: Provide a lighted, unit-mounted
control module that is factory built, wired, tested, and shock-mounted
by the generator manufacturer. The control module shall be mounted on
the generator end of the set. Control wires running between the engine
generator set and the transfer switch shall have termination
identification on both ends. Identification shall be provided for each
device or function and shall be silkscreened white on a black
background. Engine generator set control shall include the following:**

**  1. Oil pressure gauge, coolant temperature gauge, charge rate
ammeter, and running time meter.**

** 2. \"RUN-STOP-REMOTE\" manual selector switch.**

** 3. Remote, two-wire 12 volt dc control start-stop terminals.**

** 4. Manual reset field circuit breaker.**

** 5. Automatic engine shutdown for the following fault conditions:**

** a. Overcrank**

** b. Over-speed**

** c. Low lube oil pressure**

** d. High engine temperature**

** 6. Remote emergency stop.**

** 7. Dry contacts to close when engine is running to open ventilation
damper motors (if needed).**

** 8. Indicator lamps to signal the following functions:**

** a. High lubricating oil level**

** b. Low lubricating oil level**

** c. Pre-high coolant fluid outlet temperature**

** d. Low coolant fluid level**

** e. Pre-high lubricating oil temperature**

** f. Pre-low lubricating oil pressure**

** g. Battery charger malfunction**

** h. Low voltage of the starting battery**

** i. Failure to start within the specified time**

** j. Low coolant fluid outlet temperature**

** k. Over/under frequency**

** l. Not in automatic mode**

** m. Generator breaker tripped position indication**

** n. Any breaker in generator distribution panel open**

** o. Ground fault**

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

**USE PARAGRAPHS p AND q BELOW IF A DAY TANK IS USED.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

** p. Day tank overfill limit**

** q. Day tank no fuel limit**

** 9. A fault reset to clear fault indications and allow restarting of
the engine after shutdown faults. The control design shall be such that
the fault indication shall remain until reset. The fault reset shall
operate only when the \"RUN-STOP-REMOTE\" switch is in the STOP
position.**

** 10. A locking screwdriver type potentiometer to adjust the voltage
plus or minus 5 percent from rated value.**

** 11. Manual reset exciter field circuit breaker.**

** 12. AC voltmeter, 90 degree scale, 2-1/2\" flange, 2 percent
switchboard meter.**

** 13. AC ammeter, 90 degree scale, 2-1/2\" flange, 2 percent
switchboard meter.**

** 14. Frequency meter, 45-65 Hz, 90 degree scale, 2-1/2\" flange, plus
or minus 0.6 Hz panel meter.**

** 15. Four position AC meters phase selector switch, with off position,
to read line current and voltage in each phase.**

** H. Automatic Load Transfer Control: The load transfer control shall
be rated for continuous duty and for all classes of load. The control
components shall provide the following functions:**

**  1. Upon power line loss of voltage, automatically start the
generating set and, when set comes up to speed and voltage, disconnect
the load circuits from the power lines and transfer them to standby set
output.**

** 2. Upon power line restoration of voltage, transfer the load back to
the utility line and stop the standby set after a no-load, cool-down
cycle.**

** I. Transfer Switch: Rating shall be not less than \[\_\_\_\] amperes,
\[two\] \[three\] \[four\] pole, \[480/277\] \[208/120\] volts, \[three
phase, four wire\] \[single phase, three wire\], 60 Hz.**

**  1. Each pole shall be of double break design with solid
silver-cadmium contacts, capable of switching both inductive and
resistive loads rated to 600 volts. Thermal capacity of each contact
shall allow for inrush currents at least 30 times the continuous rating.
Contact pressure shall be maintained by a device not part of the current
carrying path.**

** 2. Each pole shall be enclosed in a separate heat resistant chamber
to prevent arcing between poles.**

** 3. The operating mechanism shall be electrically guided from
\"normal\" to \"standby\" and back to \"normal\" position by
interlocking switches. A mechanical interlocking bar shall also be
provided as an added safety device.**

** 4. The operating coils shall be designed for continuous duty
operation.**

** 5. The line side of the transfer switch shall be mechanically held in
the closed position and the operating coil de-energized during normal
operation.**

** 6. The engine-generator control shall contain devices and wiring
including the following:**

** a. Adjustable low voltage sensitive relay**

** b. Running time meter (can be on generator)**

** c. Exercising timer**

** d. Transfer time delay: time delay before transfer to the emergency
power source shall be adjustable from 10 seconds to 3 minutes and
factory set at 30 seconds. The device shall monitor the frequency and
voltage of the emergency power source and transfer when frequency and
voltage are stabilized at or above 90 percent of rated values. The
pickup voltage shall be adjustable from 80 to 95 percent of nominal, and
factory set at 90 percent. Transfer time delay shall include startup
time delay.**

** e. Return time delay: time delay before return transfer to the normal
power source shall be adjustable from 1 to 30 minutes and factory set at
2 minutes. The time delay shall be automatically defeated upon loss or
sustained undervoltage of the standby power source, provided that the
normal supply has been restored.**

** f. Engine stop time delay: time delay before engine shutdown
following return to normal source shall be adjustable from 1 to 30
minutes and factory set at 10 minutes.**

**[PART 3: EXECUTION]{.underline}**

**3.1 INSTALLATION**

** A. General: Install engine generator system equipment and components
as indicated, complying with the manufacturer\'s written instructions,
applicable requirements of codes and standards, and according to
recognized industry practices.**

** B. Coordination: Coordinate with other electrical work, including
raceways, boxes and fittings, to interface installation of engine
generator systems work with other work.**

** C. Grounding: Provide equipment grounding connections, sufficiently
tight to assure a permanent and effective ground, for engine generator
system equipment as indicated.**

**3.2 FIELD QUALITY CONTROL**

** A. Testing: Upon completion of installation of engine generator
system equipment, and after building circuitry has been energized with
normal power source, the engine-generator system shall be tested to
demonstrate capability and compliance with requirements. Factory
representatives shall conduct startup and testing procedures in the
presence of the Contracting Officer who shall be given 48 hours notice
before any startup or test procedure is to be performed. malfunctioning
units shall be replaced.**

**3.3 TRAINING OF GOVERNMENT EMPLOYEES**

** A. Requirements: See Section 01700 - Contract Closeout.**

**[PART 4: MEASUREMENT AND PAYMENT]{.underline}**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**WHEN A \"LUMP SUM\" CONTRACT IS USED, DELETE THE TITLE PART 4:
MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.
MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01010
­SUMMARY OF WORK.**

**\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\***

**4.1 METHOD OF MEASUREMENT**

** A. Units: The work described in this section will not be measured for
payment.**

**4.2 BASIS OF PAYMENT**

** A. Payment: No direct payment for the work described under this
section will be made. Consideration for this item shall be included in
the bid price for other items of the Contract.**

**END OF SECTION**