ST0501-SP090204SPECIFICATION
CITY OF COPPELL
SPECIFICATION FOR
INTERNALLY ILLUMINATED STREET SIGNS
1.0 GENERAL
It is the intention of this specification to obtain signs very similar in appearance to
existing internally illuminated signs. A visual sample of the type of sign desired can be
viewed at the intersection of S. Beltline Rd. & Dividend Dr. in Coppell. All signs shall be
single faced. There are a total of 72 signs on this bid. Please provide the brand and model
of the unit that is proposed on the included form.
The sign shall include solid-state high flux/high output ultra high brightness white LED
light engine strips utilizing state-of-the-art high power LED's and high efficient heat
dissipating metal carrier body. These strips shall be of length adequate to effectively light
the sign face. These strips shall utilize integral internal reflectors that will maximize the
light output at the sign face. The light strips shall be mounted directly to the top of the
sign body (1 row for single face signs) so as to be thermal1y linked to the sign body for
heat dissipation. The LED strips shall incorporate a parabolic reflector that directs the
light down to a center reflector with a custom profile that shall provide an even
distribution of light from top to bottom of the sign face.
The sign assembly height shall be a minimum of 22” and maximum of 24”, with standard
widths of 48”, 72” and 96” determined by street name length.
The body shall be aluminum. The maximum allowable weight of the sign shall be 95 lbs.
Sign shall be UL listed and approved
2.0 FIXTURE
The top of the sign shall be a one-piece inverted Tee shaped aluminum extrusion. The
inside of the extrusion will incorporate profiles for holding the LED strips in place. The
profile shall have a ½" deep groove for the 1/8" thick Polycarbonate lens to slide
horizontally in or out of either end of the sign. This groove shall also accommodate a 1/8"
thick x ½" wide closed cell UL listed foam gasket to the inside and a "D" shaped
aluminum profile which when rotated 90 degrees will compress the lens against the
gasket creating a water proof seal. The bottom of the sign shall be a one-piece aluminum
extrusion identical to the top extrusion without LED mount provision. The bottom profile
sha1l have a ½" minimum deep groove for the 1/8" thick Polycarbonate lens to slide
horizontally in or out of either end of the sign. This groove shall also accommodate a 1/8"
thick x ½" wide closed- cell UL listed foam gasket to the inside and a "D" shaped
aluminum profile which when rotated 90 degrees will compress the lens against the
gasket creating a water proof seal. The ends of the sign shall be a "c" channel profile that
is continuously welded to the top and bottom extrusions. A fabricated aluminum end cap
will be provided on each end of the sign. It shall be attached at the bottom with a stainless
steel hinge. When swung into place, the profile of the end cap will capture the ends of the
polycarbonate lens and force it against the 1/8" x 1/2" closed cel1 UL listed foam gasket.
This end cap will be held in place by a 1/4 - 20 stainless steel bolt with black nylon wing
head. The sign end channel shall have provisions for mounting ½" pipe thread cord grip
or elbow with provision for photocell and cord grip. The power supply for converting the
120VAC to the DC current required by the LED strips shall be mounted on the inside of
the end channel. A removable cover will be provided to cover the AC wiring.
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SPECIFICATION
The color of the exterior of the sign assembly shall be semi-gloss black. All exterior
surfaces of the sign assembly shall have a powder-coated finish. Finish will meet the
requirements of ASTM D 3359, ASTM D 3363, and ASTM D 552.
The sign shall have UL approved foam gaskets, to provide a watertight seal between the
sign panel and the housing.
The sign assembly including sign panel and mounting assemblies shall be designed,
tested and constructed so that no permanent deformation, warping or failure will occur
when subjected to 110 mph wind loads.
3.0 LED LIGHT ENGINE
The purpose of this specification is to provide the minimum performance requirements
for the LED Light Engine for il1uminated street signs specification. The LEDs utilized in
this product shall be white in color and utilize InGaN or UV thermally efficient
technology.
The LED lamp shall be rated for use in the ambient operating temperature range of -40 to
+50°C (-40 to +122°F) and for storage in the ambient temperature range of -40 to +75°C
(-40 to +167°F).
The LED Light Engine shall be a single, self-contained device, for installation in the
street sign housing. The power supply shall be designed to fit and mounted on the inside
wall at one end of the street sign housing. The LED Light Engine shall be mounted
within the inner top portion of the housing,
The assembly and manufacturing processes of the LED Light Engine shall be designed to
ensure that all LED and electronic components are adequately supported to withstand
mechanical shocks and vibrations in compliance with the specifications of the ANSI,
C136.31-200 1 standards.
The LED Light Engine shall operate from a 60 + 3 cycle AC line power over a voltage
range of 80 to 135 Vac rms.
Fluctuations in line voltage over the range of 80 to 135 Vac shall not affect luminous
intensity by more than + 10 %.
The LED Light Engine shall provide a power factor of 0.90, or greater, when operated at
nominal operating voltage and at a temperature of +25°C (+77°F).
Total harmonic distortion induced into the AC power line by the LED Light Engine
operated at a nominal operating voltage, and at a temperature of +25°C (+77°F), shall not
exceed 20 %.
The LED Light Engine shall not exceed the maximum power values of 120 watts.
The entire surface of the sign panel shall be evenly illuminated. The average maintained
luminous intensity measured across the letters, operating under the conditions defined in
Sections 2.1 and 3.4, shall be of an average of 500 lux + 25% across the sign face.
LED Light Engines shall be replaced or repaired if they fail to function as intended due to
workmanship or material defects within the first sixty (60) months from the date of
delivery.
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SPECIFICATION
LED Light Engines that exhibit luminous intensities less than the minimum value
specified within the first thirty-six (36) months from the date of delivery shall be replaced
or repaired.
Each LED Light Engine shall be identified by a manufacturer's serial number for
warranty purposes.
4.0 SIGN PANEL
The sign face shall be constructed of 1/8” white polycarbonate with interstate blue
overlay film (EC) formulated for this purpose.
The light transmission factor of the sign panel will provide a letter to background
brightness ratio of 10:1 to 20:1. The luminance of the background shall not vary by more
than 40% of the average background brightness reading. The luminance of the letters,
arrows or symbols shall not vary by more than 20% from the average brightness reading.
Lettering will be in the Clearview® font in the sizes specified in the exhibit. The City
Logo Legend will also be included as detailed in the exhibit. Spacing and letter sizes
must be strictly adhered to.
7.0 MOUNTING ASSEMBLY
The mounting bars shall be fastened to the rear of the cabinet with stainless steel
fasteners and all holes will be sealed to prevent water infiltration.
All clamps, brackets, bars, etc. whether made of - heat treated aluminum bar stock,
aluminum, stainless steel, or galvanized steel shall be of adequate design and strength for
its intended use.
Astro-Brac® SP0140 or approved equal shall be utilized to mount the sign to the mast
arm.
8.0 WARRANTY
All LED street name signs shall be warranted for a period of (60) months from date of
delivery
9.0 ALTERNATE PRODUCTS
The models and brand names are descriptive and not restrictive, and are used to indicate
type and quality level desired for comparison purposes. Bids on brands of like nature and
quality may be considered for the items listed on the Bid Form. Manufacturer name and
model number of alternative products should be provided on the Mfg. Name and Model
Form. In the event that a bid is being submitted for an alternate product, a sample is
required to be provided to Per Birdsall at the address shown below no later than 10
calendar days prior to the bid closing.
816 S. Coppell Rd.
Coppell, Texas 75019
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SPECIFICATION
10.0 SHOP DRAWINGS
The signs should be in accordance with this specification, the descriptions on the Bid
Form and the information in the plans when provided. Bidder should submit a set of
plans/drawings of the unit being bid and a drawing showing a scaled layout of a face per
the City’s specification created by the sign making program to be utilized by the
awarded bidder. The previous are to be submitted as attachments.
Upon award the bidder shall submit drawings for each sign face as specified prior to
production. This is to try to reduce the possibility of mistakes in the legend such as
block numbers.
11.0 INSTALLATION
Installation will proceed in an orderly fashion with an intersection being completed
before moving onto the next.
The intended locations of the signs are intended to be nearest the mast. If insufficient
spacing exists between the first signal head and the mast the sign may need to lap over
the mast.
The intended position of the sign is intended to be approximately even with the center of
the signal arm (the sign will be level). All hardware and wiring will be concealed from
view as much as practical.
Power will be supplied through a single conductor that will be provided by the City
from the base of the mast to the traffic signal cabinet.
Bidder will be required to supply sufficient wire to reach from the base of the mast to
the sign.
A single photovoltaic will be utilized to turn the lighting on and off for all of the lighted
street name signs at an intersection. The photovoltaic will be located at the traffic signal
cabinet. Bidder will be required to install and connect the photovoltaic at the cabinet. All
wiring needs to be neatly laid and secured.
The wiring exiting the illuminated signs will need to have a drip loop.
Access to the interior of the arm & mast shall be through a hole sawn (drilled) on the
underside of the arm no larger than 3/4”. Care must be utilized not to damage existing
wiring.
Removal of the existing street name signs will be performed by the City. The contractor
will be responsible for contacting the Traffic Control Division to have the signs
removed the day of installation.
Should there be a conflict with existing signal controls or indications such as preemption
receivers or confirmation lights the City will need to adjust or relocate those devices
prior to the installation of the sign.
Work Zone barricading and signs per the TxMUTCD will be required. Working hours
are restricted during rush hours. Hours of lane closures are therefore limited to between
the hours of 9 a.m. and 3 p.m. Saturday / Sunday work is not permitted.
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SPECIFICATION
MANUFACTURER NAME & MODEL FORM
BRAND:
MODEL NUMBER OR NUMBERS:
KNOWN VARIATIONS FROM SPECIFICATIONS:
INDIVIDUAL SIGN COST:
INDIVIDUAL INSTALLATION COST:
AVAILABILITY:
PROJECT TOTAL COST:
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