DIVISION 16 - ELECTRICAL
SECTION 16200-1 of 12
POWER GENERATION
16200.01 GENERAL (if dual source commercial power is unavailable)
A.
B.
Description
1.
Provide all equipment, labor, materials and supervision necessary to install and
test stand-by Diesel Engine driven electric generator set of the latest commercial
type and design as specified herein. Installation shall conform to all applicable
state and county codes and be satisfactory for locating at the site shown on County
drawing
without undue detriment to the neighborhood by either noise or
other environmental considerations.
2.
This installation of a stand-by power system shall include a generator set rated for
KW,
KVA, 60 HZ,
Volts,
Phase &
continuous stand-by service at
1800 RPM and capable of continuous operating between 15% and 100% of rating.
The complete operable standby system, factory tested, ready for installation, shall
be a package of new and current equipment consisting of:
a.
A diesel engine driven electric generator set to provide stand-by power.
b.
An engine-alternator control console resiliently mounted on the generator
set that shall include complete engine start-stop control and monitoring
systems.
c.
Mounted accessories and other equipment as specified herein and/or
required for satisfactory operation and monitoring.
Responsibility
1.
This generator set system shall be assembled, tested and shipped by one supplier
so there is one source of supply and responsibility.
2.
The supplier shall be a factory trained and certified manufacturer's representative
and shall maintain a complete service facility. The service facility shall be capable
of making delivery to the generator set site all generator set parts within 48 hours
of placing the order. The supplier shall employ a manufacturer trained and
certified technician on a full time basis at the service facility capable of making
repairs and responding to service calls within 24 hours of notice. Certified proof
of this requirement shall be available from the supplier at the time of submission
of a quote.
3.
The generator set shall be supplied by Caterpillar, Onan, Cummins, Kohler or an
approved equal. Approval of an equal will be the responsibility of the Regional
Manager responsible for the operation of the specific installation. This may
require a thorough cost analysis with regard to spare parts inventory control and
overall cost effectiveness.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
C.
SECTION 16200-2 of 12
POWER GENERATION
Quality Assurance
The Engine-Generator set system, including all accessories described herein, shall meet all
standards established by:
a.
b.
c.
d.
e.
D.
Underwriter's Laboratories
National Electrical Manufacturers Association
National Electrical Code
National Fire Protection Association Pamphlets 30, 31, 37, 76A, & 110
MIL - STD- -705B
Submittals
1.
Shop drawings
a.
The Contractor shall submit for approval a complete shop drawing
package illustrating compliance with the specifications contained herein
representing the Emergency Stand-By Power System. The Power System
shall not be fabricated until the shop drawing package is approved by the
Regional Manager responsible for the operation of the specific installation.
b.
The shop drawing shall include the following:
Published: 01/01
1)
Engine generator system plan, elevation and dimensional drawings
clearly indicating all aspects of the system including points for
each of the interconnections required, the space required for
maintenance and overhaul, and any special interfacing
requirements.
2)
Engine generator/exciter control cubicle lay out and component
descriptions.
3)
Fuel consumption rate curve at various loads, ventilation and
combustion CFM requirements.
4)
Exhaust muffler and vibration isolator descriptions.
5)
Schematic ladder and wiring diagrams for the generator system.
6)
Printed literature and brochures describing the system including all
sizing requirements and components specified.
7)
The weight of the engine, generator and complete system.
8)
Battery, battery rack and battery charge literature and description.
9)
Layout of the main fuel oil tank, day tank, float mechanism, piping
schematic and fuel connection information for the engine.
Revised:
DIVISION 16 - ELECTRICAL
2.
SECTION 16200-3 of 12
POWER GENERATION
10)
The specified standby KW of the generator shall be for continuous
electrical service during interruption of the normal utility power
source and this shall be certified to this effect by the manufacturer
for the actual unit supplied.
11)
Factory prototype test results performed on a unit of this size and
type documenting items 1 though 9 listed in section 1.06, A below.
12)
Procedure for lubricating oil sampling and recommended
frequency.
O & M Manual
Seven (7) complete Operations and Maintenance Manuals shall be furnished
before the system is accepted. This manual shall include a complete Technical and
Service Manuals for the engine, generator unit and transfer switch; start up, shut
down and emergency operating instructions, repair, trouble shooting and
preventive maintenance procedures; a recommended list of spare and replacement
parts; dimensional drawings, separate unit wiring diagrams and schematics and
interconnecting wiring requirements; special requirements for operation of the
diesel-generator between 15 and 100 percent of rating. A copy of the approved
shop drawing reflecting any post approval changes shall also be included. The
final O & M Manual shall be submitted and approved prior to conditional
acceptance.
3.
Installation Certificate
A factory technician from the generator manufacturer shall inspect the installed
generator system and certify in writing to the installer that is installed in
accordance with the manufacturer's recommendations before the system is initially
started. The technician shall be present for the initial start-up and make
recommendations to resolve any defects experienced. A copy of the installation
certificate must be submitted to the County before the generator set is
conditionally accepted.
E.
Warranty
The complete generator set, controls, accessories and assembly shall be warranted as a
whole by the manufacturer for one year from conditional acceptance for parts and labor.
Satisfactory warranty documents naming Anne Arundel County, Maryland as the recipient
of the warranty and setting forth the period of the warranty shall be provided before
acceptance. The warranty shall identify the supplier as a manufacturer's representative
capable of resolving warranty claims. Claims shall be responded to within those time
frames described in .01, B.2. above. However, the individual warranties of the component
parts will not be considered as satisfactory warranty documents.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
F.
SECTION 16200-4 of 12
POWER GENERATION
Testing
1.
Prototype tests performed on a generator set of the same size and type, required by
these specifications, shall be submitted and approved with the shop drawings,
required above. The test procedures and results shall be certified by an
independent testing laboratory. The tests shall be performed in accordance with
NFPA 110 and document the following:
a.
b.
c.
d.
e.
f.
g.
h.
i.
Maximum power level
Maximum motor starting capacity
Voltage dip
Fuel consumption
Engine-generator cooling air flow
Governor response time
Alternator temperature rise per NEMA MG1-22.40
Harmonic analysis and voltage Wave Form Deviation per MIL-STD-705
B, method 601.4
Three (3) phase short circuit test for mechanical and electrical strength
2.
Factory testing of the generator set to be supplied, shall be conducted in
accordance with procedures certified by an independent testing laboratory and
approved by the Regional Manager responsible for the operation of the specific
installation. The manufacturer shall successfully test the generator set to be
supplied, document items 1.a through i above, and submit the test results for
approval before shipping the generator set to the job site. A two hour load bank
test shall be performed and the results submitted before shipping the generator set.
3.
Acceptance Tests
a.
Acceptance testing of the installed generator set shall be conducted by a
factory-trained representative of the diesel generator manufacturer. An
authorized representative of Anne Arundel County will witness the
acceptance tests. The test procedure followed will be approved by the
Regional Manager responsible for the operation of the specific installation
and will include data taken during the procedure outlined in .01 F.3.b of
this Section as a minimum.
The test results shall be submitted to and approved by the County,
including the Regional Manager, before the equipment is accepted. The
Contractor shall furnish all testing equipment, materials, fuel, etc., needed
to demonstrate the set is in compliance with the specification. Any
deficiencies brought to the attention of the Contractor shall be corrected
and if warranted or requested by the County, the test shall be re-performed
prior to acceptance. Final O & M Manuals shall be submitted before the
acceptance tests commence.
Published: 01/01
Revised:
SECTION 16200-5 of 12
POWER GENERATION
DIVISION 16 - ELECTRICAL
b.
4.
The acceptance tests shall be performed during an eight-hour field test
during which the manufacturer's representative shall demonstrate that the
system performs in complete compliance with the specification. As a
minimum a full capacity load bank test, performed in accordance with
NFPA 110 section 5-13.2. The load tests shall use dry type load banks
specifically utilized for this purpose. The load bank will be capable of
definite and precise incremental loading and shall not be dependent on the
generator control instrumentation to read voltage and amperage of each
phase. The test instrumentation will serve as a check of the generator set
meters. Load bank testing shall be performed for a period of four (4) hours
at the full rated load of the generator. Salt water brine tank load banks are
not acceptable for this purpose and are disallowed and will not be utilized
for this test.
Oil Analysis Test
a.
The Contractor shall provide for an engine oil sample test by a qualified
laboratory during the one year warranty period. The sample shall be tested
using Atomic Absorption Spectrophotometry methods and shall be
accurate to one tenth of one part per million for the following elements:
1)
2)
3)
4)
Iron
Chromium
Copper
Aluminum
5)
6)
7)
8)
Silicone
Lead
Zinc
Sodium
b.
The sample shall also be tested for the presence of water, fuel dilution and
antifreeze, and total solids.
c.
A sample will be drawn by the County quarterly using the kit furnished by
the Contractor and sent to a testing laboratory contracted by the contractor
to test four (4) samples during the one year warranty period. The tests shall
be performed in accordance with the latest edition of "Standard Methods"
and the results returned within 14 calendar days from the sample postage
date. A copy of the purchase order authorization from the testing
laboratory shall be furnished to the County before conditional acceptance.
d.
The testing laboratory shall notify the County immediately when the
analysis shows any critical values, and the contractor shall respond to
correct all generator set problems in accordance with .01 E. of this
Section. As directed by the County, additional samples shall be tested at
no cost to the County following any analysis showing critical values, to
demonstrate correction of the problems.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
SECTION 16200-6 of 12
POWER GENERATION
16200.02 MATERIALS
A.
Engine
1.
The engine shall be diesel fueled,
cycle, liquid cooled with mounted radiator,
blower fan and coolant pump. Full pressure lubrication shall be supplied by a
positive displacement lube oil pump. The engine shall be equipped with
replacement water/fuel separator, and lube and fuel filters (spin on type if
available). The engine speed shall be controlled by an isochronous governor as
manufactured by Woodward, Barber-Colman or equal, to maintain generator
frequency through the range from full to no load at 1800 RPM, 60 HZ. The engine
shall be remote starting with a two wire, solenoid shift, electric starter. Install at
least one foot of flexible fuel line between the engine and day tank.
2.
Engine protection devices provided shall include shut down for overcrank, over
speed, high coolant temperature, and low oil pressure.
3.
A radiator with blower type fan shall be sized to maintain safe operation between
100-125°F. ambient temperature. Total air flow restriction from the radiator shall
not exceed 0.5 inches water by both inlet and outlet. The cooling system shall be
pre-treated by the engine supplier for inhibition of internal corrosion. The radiator
shall be equipped with core guard, and fan guard. Cooling system shall be
protected against freezing to -34 degrees F., with a 50% ethylene glycol antifreeze
solution. The antifreeze shall meet GM 1825 specifications.
4.
Silencers
a.
A super critical type exhaust silencer having an attenuation factor of 35-45
decibels with bottom inlet and horizontal outlet, shall be provided for the
engine generator set. Silencer shall be as manufactured by Kittel, Maxim,
or equal, with companion flange connections at inlet and outlet, and taps
for drainage. A suitable length of flexible stainless steel exhaust pipe with
nipples welded to both ends shall be furnished for mounting between the
engine and silencer. The exhaust system shall be wrapped with a nonasbestos preformed insulating material to reduce heat radiation and
covered with a metal retainer to hold the material in place and provide
additional protection.
b.
Silencer shall be mounted above the engine generator set so that its weight
is not supported by the engine. Exhaust pipe size shall be of sufficient size
to ensure that measured exhaust backpressure does not exceed the
maximum limitations specified by the engine manufacturer. Exhaust
piping shall be extended through the wall as indicated with all necessary
weatherproof accessories. Piping shall be painted with aluminum paint
capable of withstanding temperatures of 600 degrees F.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
5.
B.
SECTION 16200-7 of 12
POWER GENERATION
Jacket water heater: Provide external mounted tank type thermal circulation water
heater. The heater shall be a minimum of 3 watts per cubic inch of engine
displacement. Heaters less than 2000 watts shall be 120 Volts. Units 2000 watts
and larger shall be line voltage rated and powered through a contactor with 120
Volt control. The jacket water heater shall be a standard tank heater as
manufactured by Kim Hotstart Mfg. Co., Inc., Spokane, Washington.
Generator
1.
The generator shall be Synchronous type built to NEMA Standards, rated for
continuous stand-by at
KW,
KVA, 60 HZ,
PF,
Volts,
Phase,
1800 RPM. Class F insulation shall be used on the stator and rotor, and no
materials which will support fungus growth shall be used. The generator shall
have a resettable protector for exciter/regulator protection against extended low
power factor loads. The generator shall be capable of accepting full name plate
load in one step.
2.
An exciter/regulator shall be provided to match the characteristics of the generator
and engine. Voltage regulation shall be plus or minus 1% from no load to full
rated load. Voltage level adjustment shall be minimum of plus to minus 5%. The
solid-state regulator module shall be shock mounted and epoxy encapsulated for
protection against vibration and atmospheric deterioration. Voltage dip due to
motor starting current shall not exceed 20% for any step loading which includes
one sewage pump motor.
3.
Main Line Circuit Breaker
a.
A generator mounted main line molded case circuit breaker shall be
provided as a load circuit interrupting protection device. It shall operate
both manually for normal switching functions and automatically during
overload and short circuit conditions. The breaker trip rating shall not
exceed 100% of the generator rating or the automatic transfer switch
rating.
b.
The trip unit for each pole shall have elements providing inverse time
delay during overload conditions and instantaneous magnetic tripping for
short circuit. The circuit breaker shall meet standards established by
Underwriters Laboratories, National Electric Manufacturers Association,
and the National Electric Code.
c.
Generator exciter field circuit breakers do not meet the above electrical
standards and are unacceptable for line protection.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
C.
SECTION 16200-8 of 12
POWER GENERATION
Automatic Starting System
1.
Starting motor: A D.C. electric starting system with positive engagement shall be
furnished. The motor voltage shall be as recommended by the engine
manufacturer.
2.
Provide automatic engine starting controls within the Generator Panel to start the
engine automatically from a contact in the transfer switch.
3.
a.
When the engine starts, the starting control shall automatically disconnect
the cranking controls. The cranking disconnect means shall be electrically
self-regulating to prevent recranking for a definite time after source
voltage has reduced to a low value. If engine fails to start, or any safety
device operates while engine is running, engine shall be stopped
immediately and starting control locked out, requiring manual resetting.
b.
Controls shall provide shutdown for low oil pressure, high water
temperature, overspeed and overcrank. Controls shall include a 10-second
cranking cycle limited to 3-5 attempts before lockout.
c.
The automatic engine starting control shall incorporate industrial control
type elements throughout, which must operate at 80% battery voltage.
Relays shall be equipped with silver-gold contacts of the wiping type and
shall have adequate pressure to insure reliable performance at battery
voltage.
Provide a lighted factory built, wired, tested and generator set mounted control
panel, NEMA 12 type, vibration isolated, dead front, 14 gauge steel panel with
hinged front opening doors for providing required access to all components,
removable top and side panels for providing required access to cable entry and
terminations. The control panel shall be furnished with the following fused AC
and DC controls:
a.
D.C. engine controls including the following:
Run-stop-remote switch; remote-start-stop terminals; oil pressure gauge;
charge rate ammeter; water temperature gauge.
b.
Control cabinet front mounted status lamps shall indicate: low engine
temperature; high coolant temperature; low oil pressure; overcrank; and
overspeed. Manual reset capability shall be provided.
c.
A.C. output control shall include: A.C. Volt meter 3½ inch diameter;
meter switch phase selector with off position; a voltage rheostat; a
frequency meter 3½ inch diameter; an hour meter; and a 3½ inch diameter
A.C. ammeter with phase selector switch.
d.
Dry contacts for remote alarms wired to terminal strips.
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
4.
D.
E.
e.
Automatic starting controls.
f.
Panel illumination lights and switch.
SECTION 16200-9 of 12
POWER GENERATION
Battery Charger/Batteries
a.
Provide a current limiting, 6 ampere battery charger to automatically
recharge batteries. The D.C. voltage shall have an adjustable "float"
setting underload from 2.15-2.35 volts per cell and an adjustable
"equalize" setting under load from 2.30-2.40 volts per cell. It shall include
overload protection, silicon diode full wave rectifiers, voltage surge
suppressors, DC ammeter and voltmeter, AC overcurrent protection, and
0-24 hour equalize timer. The battery charger shall be suitable for 120-volt
AC input. The battery charger shall be LaMarche Model A-46, or equal.
b.
Provide a set of rack-mounted 24-volt lead calcium storage battery (s) of
the heavy-duty diesel starting type for the engine generator set. The battery
set shall be of sufficient capacity to provide for one and one-half minutes
total cranking time without recharging and be sized for the cold cranking
amps as recommended by the engine manufacturer. The battery(s) shall be
rated no less than 172 ampere - hours. Provide all necessary cables &
clamps.
c.
Batteries shall be installed in Marine-Type plastic boxes, Model 10625 as
manufactured by Tracy International, Pompano Beach, Florida, or equal
and set on the floor.
Engine Generator Set Base Construction
1.
The engine and generator shall be mounted in perfect alignment on an all welded
preformed structural steel I-beam or C channel skid type sub-base which shall
provide for attachment of all specified engine and generator accessories.
2.
Provide vibration isolators between the engine generator set skid-base and
concrete slab. The quantity, size and type of isolators shall be as recommended by
the manufacturer. For engine-generator sets weighing over 6000 lbs. including the
skid and all accessory equipment, the vibration isolators provided shall be of the
spring type with fiberglass pads.
Fuel System
1.
The engine generator set shall be provided with complete fuel oil supply system
including a
gallon storage tank with an internal foot valve and fittings, supply
and return piping for the skid -mounted tank and all necessary accessories. The
skid-mounted tank shall be provided with a polyurethane coating to the top of the
tank.All work shall be done in accordance with the requirements of NFPA
Published: 01/01
Revised:
DIVISION 16 - ELECTRICAL
SECTION 16200-10 of 12
POWER GENERATION
Pamphlets 30, 31 and 110, Code of Maryland 08.05.04, and all local regulations.
NOTE: Fuel system to be within containment area to prevent spill contamination.
2.
All materials shall be compatible for use with No. 2 Commercial Fuel Only.
3.
The tank shall be the smallest standard size to hold fuel for 24 hours of operation
at full load. The tank arrangement shall be as indicated on the drawings. The
storage tank shall be complete with structural steel support legs.
4.
Tank and supports shall be shot or sandblasted to clean bare metal after
fabrication and given one shop coat of red oxide primer.
5.
Provide a calibrated tank gauge stick and framed calibration chart.
6.
Furnish and install a tank level gauge. Level gauge shall be the self-acting,
continuous direct reading type.
7.
Fill and vent piping shall be ASTM-120, Schedule 40, black iron or stainless steel
sized as indicated on the drawings. Vent piping shall be provide with a whistlesignal as indicated on the drawings. Fittings shall be 150 lb., black malleable iron
screw fittings, ANSI B16.3 or stainless steel. All tank openings shall be provided
with suitable caps. Provide a drain valve for removal of any accumulation of
water in the tank. The fill pipe shall be easily accessible for filling. The fill and
vent pipes shall be extended through the outside wall and turned up so that no
spillage occurs.
8.
The tank shall be provided with steel pipe support legs and the following
connections:
2-inch fill
2-inch vent
2-inch stick (capped)
1½-inch gauge
½-inch supply
½-inch return
9.
F.
The Contractor shall fill the tank with No. 2 winter mix fuel oil and replace any
fuel used during testing.
Oil Analysis Kit
The equipment supplier shall provide an oil sampling analysis kit to be used for extracting
and storing engine oil samples. The kit shall be provided at time of conditional acceptance
and include as a minimum the following:
a.
b.
c.
Published: 01/01
Four (4) sample bottle(s)
Four (4) postage paid mailer(s), sized for the sample bottle
Written instructions for using the kit
Revised:
DIVISION 16 - ELECTRICAL
SECTION 16200-11 of 12
POWER GENERATION
Engine generator set shall be completely housed within the generator/control building.
G.
Painting
The complete generator set shall be painted with the manufacturers standard prime and
finish paint system. Observed nicks, damage, rust, etc., to the paint system of the installed
generator set shall be prepared, primed and finish coated in the field prior to conditional
acceptance.
H.
Automatic Transfer Switches
Furnish and install automatic transfer switch in the Motor Control Center for utility and
generator service. Switches shall be as follows:
a.
The switches shall be suitable for continuous operation. The transfer
switches shall be arranged for continuous operation. The transfer switches
shall be arranged to close a pilot contact for remote starting of the diesel
generator, after a time delay of 5 seconds, adjustable from 0 to 2 minutes,
after power failure or drop in any phase voltage to 85 percent of line
voltage. During the delay period, the load circuits shall not be
disconnected from the normal service lines.
b.
When the generator is delivering not less than 95 percent of rated voltage
and frequency, the load circuits shall be transferred. Retransfer to normal
service shall be automatic when full line voltage and phase are restored
after a time delay of 0 to 5 minutes, set for 3 minutes. Provision shall also
be made for manual transfer to the generator. After transfer to normal
source, the diesel generator shall continue to run for 5 minutes (adjustable
0 to 25 minutes) unloaded, shall shut down and shall be ready to start upon
the next failure of the normal source or for manual start-up. If the diesel
generator set should fail while carrying the load, retransfer to the normal
source shall be made instantaneously upon restoration of the normal
power. The pick-up and drop-out settings of the phase voltage-sensing
relays shall be completely adjustable in the field from 70 percent to 100
percent pick-up and drop-out. The transfer switch shall be a double-throw
switch operated by a single coil mechanism momentarily energized. The
switch shall be inherently interlocked mechanically and electrically.
Operating current for transfer shall be obtained from the source to which
the load is to be transferred. Failure of any coil or disarrangement of any
parts shall not permit a neutral position. The switch shall be positively
locked mechanically on either source without the use of hooks, latches,
semi-permanent magnets, or contacts. All contacts and coils shall be
readily accessible for replacement from the front of the panel without
major disassembly of associated parts. The transfer switch shall be
equipped with test button, auxiliary contacts as required for indicating
lights to show that the switch is in the normal or emergency supply
position, and remote starting of the diesel engine.
Published: 01/01
Revised:
SECTION 16200-12 of 12
POWER GENERATION
DIVISION 16 - ELECTRICAL
c.
Minimum withstand and closing ratings shall be in accordance with U.L.
1008.
d.
The transfer switches shall be approved in accordance with U.L. 1008 for
all classes of load. The automatic transfer switch shall have a voltage
rating equal to or greater than the service voltage and a continuous current
rating equal to or greater than the main service circuit breaker or generator
circuit breaker - whichever is larger.
e.
The automatic transfer switches shall be Russelectric Corporation or
Zenith rated as indicated on the drawings and complete with the following
accessories:
1)
Control panel.
2)
Exerciser clock for automatic routine exercising of generator set.
Length of exercise shall be fully adjustable and capable of
exercising the generator with or without assuming the load. If
normal power interrupts while generator is exercising at no load,
the load immediately transfers to the generator set.
3)
Two (2) time delay contacts that open simultaneously 6 seconds (1300 seconds adjustable) prior to transfer in either direction.
Contacts reclose 3 seconds after transfer.
4)
Auxiliary contacts wired to terminal strip for remote annunciation
(one closed in normal position and one closed in emergency
position).
5)
Auxiliary relay energized when generator is running (emergency
power present) with normally open contact wired to terminal strip.
This contact shall control the movable damper on the intake louver.
END OF SECTION
Published: 01/01
Revised: