SECTION 26 32 00
STATIONARY GENERATOR ENCLOSURE
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PART 1 GENERAL
1.1
SECTION INCLUDES
A.
1.2
1.3
1.4
Pre-fabricated, walk-in metal generator enclosures.
RELATED SECTIONS
A.
Section 26 32 13.13 – Diesel-Engine-Driven generator Sets.
B.
Section 23 13 23.16 – Horizontal, Steel, Aboveground Fuel-Oil, Storage Tanks.
REFERENCES
A.
ASTM A36 – Standard Specification for Carbon Structural Steel
B.
ASTM C177 – Standard Test Method for Steady-State Heat Flux Measurements and
Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus.
C.
ASTM A569 – Standard Specification for Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled
Sheet and Strip Commercial.
D.
National Electrical Manufacturers Association (NEMA) 250 – Enclosures for Electrical
Equipment (1000 V Maximum).
SYSTEM DESCRIPTION
A.
General:
1.
Generator enclosure shall be designed and constructed by Lectrus and will allow full
load operation of the engine generator system and all of its accessories.
2.
Generator enclosure will be sized for the exact unit being installed.
3.
Generator enclosure will be NEMA 3R structure of the welded and bolted design, with
all fabricated steel parts conforming to ASTM A569, Grade C-1018, and all structural
steel conforming to ASTM A36. All parts are to be individually prepped and primed
prior to assembly.
a.
Type 3R enclosures are intended for outdoor use primarily to provide a degree
of protection against falling rain, sleet and snow; undamaged by the formation of
ice on the enclosure (NEMA 250).
4.
Structural grid base and floor system shall be designed for applicable floor loading
allowing generator enclosure to be lifted and transported with the interior equipment
installed.
B.
Design and construction shall conform to the applicable sections of the latest standards as
issued by the following agencies, as a minimum:
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1.
2.
3.
1.5
International Building Code (IBC): Default Structural loading criteria shall be per the
IBC.
American Society for Testing and Material (ASTM).
National Electric Manufacturers Association (NEMA).
C.
Structural Performance:
1.
Generator enclosure shall be designed and constructed to withstand external loading
conditions as prescribed by the International Building Code for the specified final
location.
D.
Certifications:
1.
If required by the owner, generator enclosure design shall be accomplished under the
auspices of a Professional Engineer and drawings and supporting calculations will
bear the Professional Engineer’s seal.
SUBMITTALS
A.
1.6
Generator enclosure manufacturer-provided information:
1.
Approval drawings: Structural, electrical and mechanical drawings shall be submitted
for approval. Approval drawings shall be placed on the manufacturer’s FTP site and an
e-mail notification shall be sent to purchasing and approving authorities for review.
2.
As-built drawings: Structural, electrical and mechanical drawings shall be submitted as
“Certified as-built” upon completion. As built drawings shall be placed on the
manufacturer’s FTP site and an e-mail notification shall be sent to approving and
purchasing authorities. Alternatively, one (1) data DVD or CD with all drawing files in
electronic format or two hard copies shall be sent to the approving authorities.
a.
If required by the owner, hard copies of final as-built drawings shall bear the
stamp of a currently licensed Professional Engineer.
WARRANTY
A.
All materials and workmanship shall be guaranteed by manufacturer (parts and labor) for a
period of one year following shipment of the generator enclosure.
B.
Generator enclosure shall be guaranteed for coating adhesion and integrity per ASTM
standards under normal ambient and operating conditions for a period of one year following
shipment.
C.
Generator enclosure shall be guaranteed for leak resistance per NEMA 3R standards for a
period of one year following shipment.
PART 2 PRODUCTS
2.1
MANUFACTURERS
A.
Acceptable Manufacturer: Lectrus Corporation; 2215-C Olan Mills Drive, Chattanooga, TN
37421-2204. Toll Free: (800) 445-8791. Tel: (423) 894-9268. Fax: (423) 894-9337. Email:
info@lectrus.com. Web: http://www.lectrus.com.
B.
Substitutions: Not permitted.
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2.2
2.3
2.4
FABRICATION
A.
All facets of construction through coating and weatherproofing shall be performed indoors,
protected from outdoor weather conditions. Construction prior to this stage out-of-doors is
not acceptable.
B.
All permanent coatings and finishes shall be applied inside a dedicated paint booth with
ventilation and filtration provisions in compliance with the coating manufacturer’s
requirements. Coatings applied in outside, ambient air conditions shall not be acceptable.
MATERIALS AND CONSTRUCTION
A.
The base of the enclosure shall be designed for a drop-over installation, and shall include a
means for fastening to the concrete slab. The skid-base style shall include structural or
fabricated channel construction with a 7-gauge (4.6 mm) steel sheet floor.
B.
The walls shall be a minimum thickness of 2 in (50 mm) of the fabricated design, and of 14gauge (1.9 mm) steel.
C.
The roof shall be of the 6-in to 8-in (150 to 200mm) tapered design for moisture runoff, with
12 gauge (2.7 mm) steel roof members and 14 gauge (1.9 mm) steel roof panels. Lifting
eyes shall be supplied. The exhaust outlet(s) shall be supplied with a 3/16-in (4.7 mm) steel
ring, 1 inch (25 mm) above the roofline to prevent moisture from entering the enclosure. The
roof shall be 1 inch (25 mm) wider and longer than the housing.
D.
The walls, roof, and doors shall be lined with fiberglass insulation matching the wall
thickness; complete with 22 gauge (0.8 mm) galvanized liner installed with screw-type
construction.
E.
Design sound levels shall be [insert level] dBA, as measured at a distance of 23 feet (7 m)
around the housing in a free field environment. Additional wall and insulation thickness, plus
air discharge and intake hoods or sound attenuators shall be installed to meet design sound
levels.
F.
The air openings shall include [select one: motorized, fixed, combination motorized-fixed]
louvers sized to allow proper airflow. The frames and blades shall be manufactured of
aluminum and the fronts shall be covered with expanded aluminum screen. Motorized
louvers are to include bronze oilite pivots and Belimo #AF120.9US [select one: power
open/spring close, power close/spring open], 120 volt motors.
DOORS
A.
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Adequate doors shall be installed for sufficient access to the generator set and all
accessories. Single doors shall be 36 inches (0.9 m) wide and 84 inches (2.1 m) high.
Double doors shall be 60 inches (1.5 m) wide and 84 inches (2.1 m) high. As standard,
doors shall include steel hinges with brass pins, rain-rail moldings above all door openings,
recessed, keyed, chrome plated handles with positive rod locking assemblies, and fully
weather-stripped. Doors shall be removable.
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2.5
2.6
2.7
FINISH
A.
All seams shall be caulked with body sealer.
B.
The enclosure shall be metal prepped, primed with two coats of epoxy primer, and finished
with two coats of acrylic urethane enamel paint.
UTILITIES
A.
The engine generator set supplier shall ship the silencer and flex to the enclosure
manufacturer for mounting.
B.
A secondary containment skid-base fuel tank shall be incorporated into the skid of the
enclosure. Structural and fabricated rails shall be designed for the capacities and weights of
the entire system. As a minimum, the rails shall be of 7-gauge formed steel, with 7-gauge
top, bottom, and baffles.
C.
A 2-inch (50 mm) exterior fill and 10 gallon (38 liter) spill containment, 75% full light, 95% full
light with locking door, tank vent, rupture basin vent, emergency relief vent, mechanical
gauge, drain, low level alarm dry contact, leak detection dry contact, & ports for supply,
return, and one (1) spare connection shall be installed.
D.
The installer of the genset shall install a galvanized air discharge duct, with flexible section,
between the engine radiator and the exhaust louver.
CUSTOMER SUPPLIED EQUIPMENT
A.
The enclosure manufacturer shall install and wire the generator set and all related transfer
equipment, distribution equipment, and all ancillary systems for the proper operation of the
total system, prior to shipment to the job-site for final installation. Included, shall be a 60
amp, minimum circuit breaker panel, with breakers for lights, outlets, louver motors, engine
water jacket heater, battery charger, and enclosure heater, if needed.
PART 3 EXECUTION
3.1
3.2
EXAMINATION
A.
Do not begin installation until supporting foundation or building pad has been properly
prepared and inspected by an authorized Lectrus representative.
B.
If building pad preparation is the responsibility of another installer, notify owner, engineer or
architect of unsatisfactory preparation before proceeding.
PREPARATION
A.
Locate and verify utility services and structural foundation prior to installation.
B.
Prepare foundation using the methods recommended by the manufacturer.
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3.3
INSTALLATION
A.
3.4
Whenever possible, the generator enclosure shall be installed by a Lectrus installation
services team.
PROTECTION
A.
Protect delivered units, accessories and installed products until completion of project.
B.
Touch-up, repair or replace damaged products before substantial completion.
END OF SECTION
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