732 TRAFFIC SIGNAL MATERIAL
732.01 Vehicular Signal Heads, Conventional. Ensure
that vehicular traffic signal heads conform to the ITE
“Vehicle Traffic Control Signal Heads” standard. In conformance with the
above standard, provide signal heads that are of cast nonferrous corrosion
resistant metal.
Traffic
signals consist of specified assemblies of optical sections containing 12-inch
(300 mm) diameter lens opening, a housing, a door
frame with stainless steel hinge pins and latching device, visor, wiring, and
includes LED lamp in accordance with 732.04. Retention
hardware for LED lamps, if sharing threaded hole with visor hardware, shall
consist of minimum 1/2-inch (13 mm) long, set screw with retaining tab and
captive wingnut or hex nut. All hardware shall be
stainless steel and set screw shall be inserted into signal section door using
visible, semi-permanent threadlocking compound. All
hardware used to join optical sections together shall be stainless steel.
Furnish
signal heads with required mounting hardware. Furnish signal face
orientation to traffic by serrated rings or other devices on housing sections
and mounting hardware. Permit adjustment in increments not greater than 5
degrees of rotation and not affected by wind gusts when locked. Furnish
galvanized steel or aluminum spacers and drop pipes 1 1/2 inches (38 mm)
nominal pipe size (1.90 inch (48 mm) actual diameter). Ensure that
disconnect hangers have at least twelve terminals unless a greater number is
required Tethered heads shall use ¾-inch unpainted cast aluminum span wire clamps
and cable entrance adapters with integral tri-studs (no tri-stud inserts),
stainless steel hardware, and a single steel-reinforced mounting hole.
Free-swinging heads shall use cast iron span wire clamps and cable entrance
adapters with tri-studs. A neoprene gasket placed under the clamp washer in the
top signal section shall effectively seal the entrance adapter on the signal to
make a waterproof connection and shall have a minimum thickness of 3/32
inch. The inside surface of the visors shall have a finish of flat black.
All other exterior surfaces of the signal head and hardware shall have a finish
of Federal Yellow or Gloss Black to closely agree with Federal Standard 595, Color 13655 or
Color 17038, as specified in the plans. The coating system used shall be
durable, uniform, and weather resistant.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.02 Vehicular Signal Heads, Optically Programmed, 12-inch (300 mm)
Lens.
Ensure that the signal sections conform to applicable portions of the ITE
standard and 732.01. Furnish and mount
optical sections with a 12-inch (300 mm) lens size alone or in combination with
additional sections of optically programmed or conventional optics types to
form signal faces and heads. Furnish an optically programmed signal
section that includes an LED lamp.
Balance
adjusters, used only if specified, shall have a splined eyebolt design and
splined external clamping body. All assembly hardware shall be stainless
steel.
Furnish a visor with each signal section.
Cable
entrance adapters shall be of the tri-stud type with stainless steel
hardware. A neoprene gasket placed under the clamp washer in the top
signal section shall effectively seal the entrance adapter on the signal to
make a weatherproof connection and shall have a minimum thickness of 3/32 inch
(2.5 mm)..
Furnish materials according to the Department’s Qualified
Products List (QPL).
732.03 Vehicular Signal Heads, Optically Programmed, 8-inch (200 mm)
Lens.
Optically programmed signal heads with 8-inch (200 mm) lenses consist of a conventional 8-inch (200 mm) signal housing, reflector and
door; and an extension portion which is attached in place of a conventional
lens and which contains a lens system capable of optical programming.
Furnish the conventional signal housing with reflector and wiring, and the
optical programmable extension portion according to the applicable requirements
of 732.01 and 732.02.
Furnish
a cutaway visor with each signal section. Ensure that the signal sections
include LED lamp.
Furnish
manufacturer’s certifications verifying material meets specifications
requirements.
A. Optically Programmed and Pedestrian
Signal Incandescent Lamps.
Ensure that optically programmed and pedestrian signal incandescent lamps
conform to the ITE A Standard for Traffic Signal Lamps and Table
732.04-1.
B. Vehicular Signal Incandescent Lamps. The use of vehicular signal incandescent traffic
signal lamps is no longer permitted..
C. Vehicular and Pedestrian
Light Emitting Diode (LED) Lamps.
Prequalify vehicular and pedestrian LED lamps according to Supplement
1097.
Furnish LED signal
lamp units that meet or exceed all the requirements of the current Institute of Transportation
Engineers (ITE) publications - Vehicle Traffic
Control Signal Heads (VTCSH) - Light Emitting Diode
(LED) Circular Signal Supplement 2005; Pedestrian Traffic Control Signal
Indications (PTCSI) - Part 2: Light Emitting Diode
(LED) Pedestrian Traffic Signal Modules and Vehicle Traffic Control
Signal Heads - Part 3: Light Emitting Diode (LED) Vehicle Arrow Traffic
Signal Modules, unless otherwise stated herein. LED module shall be
certified by the Intertek LED Traffic Signal Module Certification Program,
and each unit shall have a decal indicating Intertek
certification.
All LED signal lamp
units shall be the latest model currently in production and new. Equipment
no longer being manufactured shall not be accepted, even if it meets the
following specifications.
LED signal lamp units
shall conform to the following criteria:
1. Physical and
Mechanical Requirements
a. The LED traffic signal lamp unit shall be designed as a retrofit replacement for existing incandescent signal lamps and shall not require any special tools for installation. The 12" (300 mm) retrofit replacement LED traffic signal lamp unit shall fit into existing traffic signal housings built to ITE VTCSH standards
without modifications.
b.
Installation of a retrofit replacement LED traffic signal lamp unit into an existing signal housing shall only require removal of the
existing lens and incandescent lamp. The new unit shall fit securely in the
housing door and connect to existing electrical wiring or terminal block by
means of simple connectors. Removal of the reflector is optional.
c.
Each LED signal lamp unit shall be identified on the back side with the
following:
(1)
Manufacturer’s name and trademark
(2)
Part number
(3)
Serial number (must be unique for each unit)
(4)
Voltage rating
(5)
Power consumption (watts and volt-ampere)
(6)
Vertical indexing indicator (i.e., “up arrow”, or the word “UP” or “TOP”) if
specific orientation of the module is required.
(7)
Date of manufacture (minimum information required - month & year)
Single units shall
have identification markings as to the type and color of the module. Bi-Modals
shall be marked with module type.
Each LED signal lamp
unit shall have a label placed on the unit certifying compliance to ITE
standards for color and luminance.
d.
The LED traffic signal lamp unit shall be a single, self-contained device, not
requiring on-site assembly for installation into an existing
traffic signal housing.
e.
The assembly and manufacturing process for the LED traffic signal lamp unit
assembly shall be such as to assure all internal LED and electronic components
are adequately supported to withstand mechanical shock and vibration from high
winds and other sources. The LED signal lamp shall survive 3 drops of 42
inches onto a smooth concrete surface without any loosening or breaking of internal
components, or change in operation.
f.
The lens of the LED signal lamp unit shall be capable of withstanding
ultraviolet light (direct sunlight) exposure for a minimum time period of five
years without exhibiting evidence of deterioration.
g.
Ensure that lenses will withstand a 42-inch (1.0 meter) drop test, are a
minimum of 1/8 inch (3 mm) thick, and are free of bubbles and imperfections.
The lenses shall be smooth on the outside with no external facets to prevent
dirt and debris build up.
h.
Each LED traffic signal lamp unit shall comprise a UV stabilized polymeric
outer shell, multiple LED light sources, and a regulated power supply.
i.
If red or yellow lenses are tinted, they shall match the wavelength
(chromaticity) of the LED. Do not furnish green tinted lenses.
j.
An optical assembly shall diffuse the light output and provide uniform
illumination across the entire surface of the lens and eliminate the visibility
of the individual LEDs to the observer. The
optical assembly shall be used for all ball modules and shall be optional on
arrow and pedestrian modules.
k.
The LED traffic signal lamp unit shall be designed for universal installation
in both span wire and standard/stationary pole mount applications.
l.
The Arrow pattern produced by the Arrow LED traffic signal lamp units shall
conform to the VTCSH standard for color, size and shape. The Arrow
LED traffic signal lamp units shall not require a specific orientation or have
a variance in light output, pattern or visibility for any mounting orientation.
m.
LED pedestrian signal lamp units shall be designed as a retrofit replacement,
modular or screw in unit for the message bearing surface of a 12" (300 mm)
pedestrian traffic signal, type A-2, housing.
n.
The LED pedestrian signal lamp unit shall fit into existing pedestrian signal
housings without the need to modify the housing. Installation of the retrofit
replacement LED pedestrian signal lamp unit into an existing 12" (300 mm)
pedestrian signal housing shall only require the removal of the existing
message bearing surface, existing lamp components (i.e. lens, lamp module,
gaskets, and reflector) and insertion of the retrofit replacement into the area
once occupied by the removed assembly.
o.
The single pedestrian module shall be designed to display a full “HAND” icon
and a full “Walking” Person icon that complies with standards for this (icon)
symbol for the size specified.
p.
LED traffic signal lamp units shall be visible at 450 feet (137 meters) during
sway conditions (extended view) until obscured by the visor.
q.
The module shall be designed to detect catastrophic loss of the LED load. Upon
sensing the loss of the LED load, the module shall present a resistance of at
least 250K Ohms across the input power leads within 300 msec.
r.
Turn-On and Turn-off time is less than 75 msec. Also, low voltage Turn-Off is
less than 35 Volts.
a.
The red and orange lamps shall be
manufactured using AlInGaP
(Aluminum-Indium-Gallium-Phosphide) technology or other LEDs
with lower susceptibility to temperature degradation than AlGaAs
(Aluminum-Gallium-Arsenic). AlGaAs LEDs will not be permitted. Green and yellow lamps shall be
manufactured using Indium Gallium Nitride.
b.
Each LED traffic signal lamp unit shall meet minimum laboratory light intensity
values, color (chromaticity), and light output distribution as described in ITE VTCSH –
LED Circular Signal Supplement.
c. Arrow LED traffic
signal lamp units shall be designed so that when operated over the specified
ambient temperature and voltage ranges, the signal is clearly visible and
attracts attention for a distance of at least 1300 feet (400 meters) under
normal atmospheric conditions..
d.
Measured chromaticity coordinates of LED traffic signal lamp units shall
conform to the chromaticity requirements of the following table, for a minimum
period of 60 months, over an operating temperature range specified in
section AD. Each LED traffic signal lamp unit shall meet the minimum
requirements for light output for the entire range from 80 to 135 volts.
Chromaticity Standards
Red |
Y: not Y: not greater than 0.308 or less than 0.998 - x |
Yellow |
Y: not Y: not less than 0.411 nor less than 0.995 – x nor less than 0.452 |
Green |
Y: not Y: not less than 0.506 - 0.519x nor less than 0.150 + 1.068x nor more than 0.730 |
e.
LED pedestrian signal lamp units shall be designed so that when operated over
the specified ambient temperature and voltage ranges, the signal shall attract
the attention of, and be readable to, a viewer (both day and night) at all
distances from 10 feet (3 meters) to the full width of the area to be crossed.
f.
The measured chromaticity coordinates of LED pedestrian signal lamp units shall
conform to the chromaticity requirements of Section 5.3, Color and the
associated Figure C of the PTCSI standard, for a minimum period of
60 months, over an operating temperature range specified in section
AD@. Each LED traffic signal lamp unit shall meet the minimum
requirements for light output for the entire range from 80 to 135 volts.
a.
Each unit shall incorporate a regulated power supply engineered to electrically
protect the LEDs and maintain a safe and reliable
operation. The power supply shall provide capacitor filtered DC regulated
current to the LEDs according to the LED
manufacturer’s specification.
b.
The LED traffic signal lamp unit shall operate on a 60 Hz AC line voltage
ranging from 80 volts RMS to 135 volts RMS. The
circuitry shall prevent flickering over this voltage range. Nominal rated
voltage for all measurements shall be 120 ± 3 volts RMS.
c.
All unit types shall be operationally compatible with the traffic signal
equipment that each type is designed and intended to interface with. This
equipment includes all controllers, conflict monitors, current monitors, switch
pack and flashers currently in use by the Ohio Department of Transportation.
The LED traffic signal lamp unit shall be operationally compatible with all
TS-1, TS-2, 170 and 2070 controllers, NEMA
TS-1 conflict monitors (including so-called NEMA
plus features such as dual indication detection and short yellow time detection);
NEMA
TS-2 Malfunction Management Units; and 33x cabinet Type 210ECL and 2010ECL
conflict monitors (including red monitoring and so-called plus features such as
dual indication detection and short yellow time detection) currently used by
the Department. In the case of conflicts between specifications, the
latest ODOT specifications will control.
e.
Two, captive, color coded, 600 V, 20 AWG minimum
jacketed wires, 3 feet (0.9 m) long, conforming to the National Electric Code,
rated for service at 221 °F (105 °C), are to be provided for an
electrical connection.
f.
The LED signal shall operate with a minimum 0.90 power factor.
g.
Total harmonic distortion (current and/or voltage) induced into an AC power cabinet
bus by any sample of 10 signal lamp units shall not exceed 20 percent. This
value may be calculated using the root-mean-square combination of the measured
harmonic distortion from one sample LED signal lamp unit.
h.
LED signal lamp units and associated on-board circuitry shall conform to the
requirements in Federal
Communications Commission (FCC) Title 47, Sub Part B, Section 15 regulations
concerning the emission of electronic noise.
i.
The LED signal lamp units shall incorporate circuitry to ensure that they show
no evidence of illumination for input voltages below 35 volts. LED signal
lamp units shall be illuminated (unregulated illumination) for all input
voltages higher than 45 volts AC but less than 80 volts AC. They shall
have fully regulated illumination for applied voltages of 80 volts through 135
volts AC. Proof of the intended function of this circuitry shall be
accomplished by connecting the lamps to a variable voltage source and slowly
raising the applied voltage from zero volts up to 135 volts, and then slowly
lowering the applied voltage from 135 volts to zero volts.
j.
Proposed LED signal lamp units shall be less than or equal to the base wattage
shown below at 77 °F (25 °C).
Retrofit |
Wattage |
12@ R 12” Red Ball |
12 or less |
12@ Y 12” Yellow Ball |
22 or less |
12@ G 12” Green Ball |
15 or less |
12@ Y 12” Yellow Arrow |
10 or less |
12@ G 12” Green Arrow |
l9 or less |
a.
Green and red LED traffic signal lamp units shall be rated for use in the
ambient operating temperature range of -40 °F to +166 °F (-40 °C to +74 °C). Yellow
signal lamps shall be rated at a range of -13 °F to +77 °F (-25 °C to +25
°C).
b.
The unit shall consist of a housing that is a sealed watertight enclosure that
eliminates dirt contamination and allows for safe handling in all weather
conditions. The LED signal lamp unit shall be sealed against dust and moisture
intrusion per the requirements of NEMA
Standard 250-1991 for Type 4 enclosures to protect all internal LED and
electrical components.
5. Documentation
Requirements. Each LED traffic
signal lamp unit shall be provided with the following documentation:
a.
Installation instructions.
b.
The manufacturer name, brand and model number of all LEDs
used shall be provided, along with the LED manufacturer’s recommended drive
current and degradation curves.
6. Warranty. The LED signal lamp unit shall be repaired or replaced
by the manufacturer if it exhibits a failure due to workmanship or material
defects within the first 60 months of field operation.
The LED signal lamp
unit shall be repaired or replaced by the manufacturer if, when operating over
the specified operating ambient temperature and voltage ranges, the unit does
not meet or exceed all minimum luminous intensity requirements as defined in
the specifications during the first 60 months of field operation.
The measured
chromaticity coordinates of LED signal lamp units shall conform to the
requirements for chromaticity in the specifications over the temperature range
provided in the Specifications for the duration of the warranty period.
The manufacturer
shall provide a written warranty against defects in materials, workmanship and
luminous intensity for LED signal lamp units for a period of 60 months after
installation of LED signal lamp units. Replacement LED signal lamp
units shall be provided within 10 days after receipt of failed LED signal lamp
units at no cost, except the cost of shipping the failed units.
An LED pedestrian
signal lamp unit shall be repaired or replaced by the manufacturer if the
signal lamp unit does not attract the attention of, or is not readable to, a
viewer (both day and night) at all distances from 10 feet (3
meters) to the full width of the area to be crossed when operated
over the specified operating ambient temperature and voltage
ranges.
Furnish materials
according to the Department’s Qualified
Products List (QPL).
732.05 Pedestrian
Signal Heads.
Furnish pedestrian signal heads that conform to the ITE
Pedestrian Traffic Control Signal Indications. Furnish signal heads that are complete units
made up of two optical compartments with no leakage of light from one
compartment to another. Ensure that the signal heads alternately display
the symbol of an upraised hand in Portland orange and the symbol of a walking
person in white light. Do not furnish outline style symbols.
Furnish material for housings that consist of cast or sheet, corrosion
resistant, non-ferrous metal. Adequately reinforce the housings.
Ensure that the lens frames are non-ferrous metal or polycarbonate material.
Ensure
that the lenses are glass or ultraviolet and impact-resistant plastic and
display the legend with translucent symbols within an opaque black background.
Seal
the lens to the door frame by the use of a weatherproof seal. Furnish an
elastomeric gasket between the door frame and housing to ensure a dust and
weatherproof seal.
Use
a signal head design that provides adequate dissipation of heat.
Fit
each compartment of pedestrian signal heads with a visor that is at least 7
inches (175 mm) in length or, in lieu of visors, protect the entire face with a
sunshade fastened close to the lens. Furnish a black grid sunshade
fabricated of high impact resistant plastic with a nominal depth of 1 1/2
inches (38 mm) and consisting of horizontal members spaced at not more than
1/2-inch (13 mm) and vertical members spaced appropriately.
Furnish
pedestrian signal heads with required mounting brackets. Furnish either
pipe type brackets or, when compatible with the mounting position required by
the plans, two-piece hinged type brackets that support the signal head close to
the pole.
Furnish
1 1/2-inch (38 mm) galvanized steel pipe brackets with necessary fittings and
adapters, and that are one-way or two-way as required. Orient the signal
face to crosswalks by selective meshing of serration rings or other devices
provided on housings and mounting brackets. Make adjustment in increments
not greater than 5 degrees of rotation and that is not affected by wind gusts
when locked.
Furnish
two-piece hinged brackets of cast aluminum with stainless steel hinge pins, and
when closed will be secured by a tamperproof bolt. Ensure that the
mounting incorporates a terminal block for quick disconnect of field
wiring. Ensure that the mounting design permits attachment to the pole by
banding, bolting or by lag screws in the case of wood poles.
Finish
signal exterior surfaces black with enamel coating. Finish interior surfaces of
visors flat black.
Furnish
pedestrian signal head types according to Table 732.05-1.
Signal Head Type |
Symbol Height, Inches, (mm) |
Light Source |
A1 A2 |
6 (152) 9 (229) |
LED |
D2 |
9 (229) |
LED |
If specified,
furnish the types listed below:
A. Type A1. Furnish a signal head that utilizes the
housings of two 8-inch (200 mm) lens type vehicular traffic sections connected
together to form a vertical unit. Ensure that the sections have square
lenses. Ensure that the upper lens displays the symbol of an upraised
hand in portland orange and
the lower lens will display the symbol of a walking person in white.
Furnish materials
according to the Department’s Qualified
Products List (QPL).
B. Type A2. Furnish a signal head that utilizes the
housings of two 12-inch (300 mm) lens type vehicular traffic sections connected
together to form a vertical unit. Ensure that the sections have square
lenses with the same symbol position as Type A1. Furnish materials
according to the Department’s Qualified
Products List (QPL).
C. Type D2. Furnish a single housing signal head with a
lens in one piece or in two sections, one for each message. Color and mask the
lens to display in portland
orange the symbol of an upraised hand from the left compartment and the symbol
of a walking person in white from the right compartment. Install a lamp in each
compartment. The upraised hand and the walking person symbols may be integral
in the same compartment.
1.
Operation.
a.
Display driver shall be designed to allow individual LED failures without
affecting other LEDs in the same display.
b.
The countdown timer shall be of the “smart” type, which continuously samples
the timing intervals presented by the pedestrian signal load switch driver(s) in
order to “learn” the programmed timing being used by the controller.
c.
During interval sampling time, the countdown timer numerical display shall be blank.
d.
Sampling time to determine interval settings shall take a maximum of two
complete signal cycles.
e.
The unit shall be capable of displaying a countdown commencing at the onset of
the pedestrian clearance interval and reaching zero at the end of the
pedestrian clearance interval.
f.
Any interruption of the flashing pedestrian clearance display, e.g.,
preemption, timing plan change, during a countdown display shall immediately
cause blanking of the countdown numerals. The countdown timer shall
“re-learn” the pedestrian clearance interval upon return to normal service
after preemption or immediately following a change in walk clearance time
associated with a timing plan change.
2.
Type A2. The top section shall be identical to the 12 inch (300 mm) Type
D2 pedestrian signal. The bottom section shall consist of a countdown
display in a 12 inch (300 mm) housing.
3.
Type D2. The left side of the signal section shall consist of an integral
hand/walking person display. The right side compartment shall contain the
countdown display.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.06 Pedestrian Pushbuttons. Furnish pushbuttons of sturdy construction that
consist of a base housing and a removable cover. Furnish components that
provide a pushbutton with normally open contacts and that include all electrical
and mechanical parts required for operation.
Ensure that the
design of the pushbutton and its associated contacts and housing are sturdy and
resistant to mechanical shocks and abuse. Ensure that a concentrated
force of 50 pounds (225 N) applied to the button or any exposed portion does
not damage the unit or misadjusts the contacts. Furnish a housing with a curved back surface for mounting on poles
of various diameters. Integrate the curved surface with the housing or
supply an adapter with a flat back type housing.
Attach the cover assembly to the housing by stainless steel machine screws,
resulting in a weatherproof and shockproof assembly. Furnish a hole
threaded for a 1/2-inch (13 mm) pipe in the housing for conduit attachment
purposes. Paint external surfaces yellow with enamel paint of Color
13655, Federal Standard 595 , unless specified otherwise in the Plans..
Ensure that the
maximum force required to operate the pushbutton is 5 pounds (22.5 N).
Furnish a raised or flush pushbutton with a minimum of 2 inches at its smallest
dimension.
Furnish
pedestrian pushbutton signs that are a minimum of 0.07-inch steel or 0.10-inch
aluminum. Ensure that the legends and backgrounds are baked enamel paint
for steel signs and enamel paint or non-reflective sheeting for aluminum signs.
Furnish materials according to the Department’s Qualified
Products List (QPL).
A. NEMA TS-1. Ensure that the loop detector units comply with
the requirements of NEMA
TS-1, section 15, with the following modifications. Furnish shelf
mounted loop detector units that are powered from 120 volts. Use solid
state isolated output units for all controller applications where directly
connected to a solid state digital controller unit. Ensure that the
conductors in the cable harness for loop input pins are twisted three to five
times per 1 foot (300 mm).
Ensure that the
electrical connections for four-channel shelf-mounted units either are the
19-pin MS connector, as required by the foregoing specification, or consist of
four connectors of the type required for single-channel shelf-mounted detector
units.
If specified, design
detector unit electrical connection plugs or wiring harness such that any
multi-channel shelf-mounted detector unit may be readily replaced with
single-channel detector units. Accomplish this by furnishing only units
with the connector type required for single-channel shelf-mounted detector
units, or by wiring the controller back panel to single-channel harnesses which
are, in turn, plug-connected to an adapter harness which is mated to the
multi-channel connector of the detector unit.
Furnish loop detector
unit with an LED or LCD display indication of call strength (∆L/L or
equivalent). This display shall be a bar graph
or numerical display with at least
eight (8) discrete levels indicated.
Furnish materials
according to the Department’s Qualified
Products List (QPL).
B. NEMA TS-2. Furnish loop detector units according to NEMA
Standards TS-2.
Furnish loop detector
unit with an LED or LCD display indication of call strength (∆L/L or
equivalent). This display shall be a bar graph
or numerical display with at least
eight (8) discrete levels indicated.
Furnish materials
according to the Department’s Qualified
Products List (QPL).
732.08 Loop Detector Units, Delay and Extension Type. Ensure that the loop detector units of this type
comply with the requirements of NEMA TS-1, section 15. Furnish shelf-mounted loop
detector units that are powered from 120 volts. Use solid state isolated
output units for all controller application where directly connected to a solid
state digital controller unit. When specified, apply the provisions of 732.07 for possible replacement of multi-channel units
with single channel units.
Furnish
loop detector unit with an LED or LCD display indication of call strength (∆L/L
or equivalent). This display shall be a bar graph
or numerical display
with at least eight (8) discrete levels indicated.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.11 Signal
Supports. Furnish
signal poles and mast arms that are tapered tubes of a true continuous
taper. Furnish tubes that are circular or regular polygons with six or
more sides. Ensure that any measurements of circular tube diameter at a
specific point along the longitudinal axis do not vary by more than 3/16-inch
(5 mm). Ensure that the taper is between 0.54 and 1.3 percent.
Fabricate
mast arms of the true continuous taper type in two portions joined by
overlapping of sections with the overlap being at least 1 1/2 diameters as determined by the largest diameter of the outer
portion. Assemble the sections with a 5/8-inch (16 mm) minimum stainless
steel or galvanized steel hex head through-bolt.
Ensure
that there is not more than one longitudinal, automatically electrically welded
seam on circular poles. Ensure that the welded seams are neat and uniform
in appearance and have a thickness not less than the base material and a bead
height not exceeding 1/16-inch (2 mm). Ensure that the wall thickness at
each pole or arm cross-section is of uniform thickness, except at weld
beads. Do not place transverse seams or welds on true continuous taper
type poles or arms. Weld according to 513.17.
After
fabrication, hot-dip galvanize poles and arms
according to 711.02.
Do
not use guy rods or truss-type arms. Furnish poles and mast arms with
attachment plates and gussets. Assemble using high-strength bolts with
the connection developing the full moment-resisting capability of the
arm. Do not allow the butt diameter of mast arms to exceed the nominal
diameter of the pole at the point of attachment.
Fit
poles with a welded-on cast or plate steel base designed to mount on an anchor
bolt foundation and ensure that each pole includes the furnishing of anchor
bolts and conduit ells for installation in the foundation. Furnish at
least one 2-inch (50 mm) diameter conduit ell for installation in each
foundation. Furnish conduit ells made from steel complying with 725.04;
however, if they connect to non-metallic conduit, ensure that they are of the
same non-metallic material.
Use
steel anchor bolts conforming to ASTM F1554, Grade 105 and
galvanized according to 711.02.
Ensure that the galvanizing extends at least 2 inches (50 mm) beyond the
threads. Ensure that ends either are bent or have a drilled and tapped
steel plate as shown on the plans.
Ensure
that the poles include a handhole near the base
oriented as required. Reinforce the handhole
with a welded-on steel frame with a grounding lug and fit it with a cover plate
fastened by stainless steel screws. Ensure that the poles also include a
cable and wire support J-hook welded near the top and a removable pole
cap. Design poles and arms so their interiors conceal wiring and their
mast arms include grommeted wire outlets for the
signal heads. Furnish hanger clamps with clevises on the mast arms for
the signal heads as required. Ensure that arm caps are made of steel and
cover at least 50 percent of the end area.
Ensure that
signal poles combining provisions for roadway lighting include an additional handhole located opposite the mast arm flange with the
poles’ J-hook located above.
Furnish
pedestrian pushbutton access holes and blind half couplings for controllers and
pedestrian signal heads as required. Plug any unused holes.
Furnish
certified materials according to Supplement
1094.
732.12 Strain Poles. Furnish signal strain poles for the attachment of
span wire that are steel tapered tubes according to the requirements of 732.11. Ensure that all poles include a removable pole
cap, and messenger wire clamps with clevis and shackle unless otherwise
specified.
Furnish anchor
bolt foundation type strain poles that include a welded-on cast or plate steel
base, bolt covers, a handhole, and a J-hook, as
required by 732.11, and that also include at least one
2-inch (50 mm) cable entrance with a weatherhead and
a welded blind half-coupling. Ensure that the poles include the
furnishing of anchor bolts and conduit ells for installation in the
foundation. Furnish at least one 2-inch (50 mm) diameter conduit ell for
installation in each foundation. Furnish steel conduit ells that comply
with 725.04;
however, if they connect to non-metallic conduit, ensure that they are of the
same non-metallic material.
Furnish
certified materials according to Supplement
1094.
732.13 Wood Poles.
Furnish wood poles that conform to ANSI
05.1 “Specifications and Dimensions for Wood Poles”, that are made of
Southern Pine or Western Red Cedar, and that are full-length pressure treated
according to 725.19.
732.14 Down Guy Assemblies. Furnish expanding or screw type anchors capable of
withstanding a guy tension of 8000 pounds (35 kN) when installed in firm moist soil. Ensure that
each anchor rod is 5/8-inch (16 mm) minimum diameter, 8 feet (2.4 m) minimum
length galvanized steel with thimble eye.
Ensure
that all pole and attachment hardware is hot dip galvanized in accordance with 711.02.
Furnish
3/8-inch (10 mm) minimum diameter guy wire that conforms to 732.18 and
ensure that all accessories have a rated loading strength equal to or greater
than the messenger wire minimum breaking strength.
Furnish
porcelain strain insulators of the wet process type.
Furnish
an 8 feet (2.4 m) minimum length guy guard made of impact and ultraviolet light
resistant yellow plastic that is fastened to the guy wire.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.15 Pedestals.
Fabricate pedestals for the support of traffic control equipment of 4-inch (100
mm) schedule 40 steel or aluminum pipe. Fit the steel pipe with a
welded-on base of plate or cast steel, or when specified thread the steel pipe
into a gray cast iron transformer type base. Furnish galvanized steel
pedestals according to 711.02.
Thread aluminum pipe into an aluminum cast transformer type base. Design
pedestals to mount on an anchor bolt foundation and include the furnishing of
anchor bolts and conduit ells for installation in the foundation.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.16 Conduit Risers. Ensure that risers have conduit and fittings
according to 725.04 and the weatherhead is made of aluminum or galvanized ferrous metal
and threaded.
732.17 Cable Support Assemblies. Ensure that the cable grip used with cable support
assemblies is of the proper size and strength for the cables and is of the
flexible “closed” or “split with rod” type, of stainless steel or tin coated
bronze, and equipped with a single “U” eye bale. Ensure that the smallest
cable grip permitted has a minimum rated breaking strength of 250 pounds (1.1 kN).
Ensure that the
slings for cable supports are made from copper clad or galvanized multi-strand
steel wire with an overall diameter of not less than 1/8-inch (3 mm) and a
breaking strength of at least 400 pounds (1.7 N). Use thimbles to form
eyes at each end of the sling with grooves to match the wire. Adjust the
sling to the proper length with the wire at each thimble lapped and secured
with split bolt clamps.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
A. Wire. Furnish seven strand ASTM A475 Class B
Utilities Grade or stronger messenger wire except 1/4-inch (6 mm) seven strand
messenger wire must be High Strength Grade or stronger. Furnish 1/4-inch (6 mm)
seven strand ASTM A475 Class B High
Strength Grade or stronger tether wire. Furnish all wire per ASTM A475 with the
following modifications:
18.2 Tags are not required on lengths less than 1000 feet
(300 m).
B. Accessories. For messenger wire ensure all accessories have a
rated loading strength equal to or greater than 73 percent of the messenger
wire minimum breaking strength. For breakaway tether installations, accessories
within the turnbuckle-tensioned portion of the tether span shall have strength
equal to or greater than 73 percent of the breaking strength of 1/4-inch,
7-strand ASTM A 475
High Strength Grade Wire rope, or 3460 pounds (15.4 kN).
Other portions of the tether assembly shall use accessories strength equal to
or exceeding the wire rope used in that portion. S-hooks shall be made of mild
low-carbon galvanized steel and of the wire size indicated on the plans; larger
wire sizes and higher-strength steel S-hooks shall not be substituted. Safety
tie wire shall be 304 or 316 stainless steel, 1×19 stranded,
1/8-inch (3 mm) with stainless steel wire rope clips. If used, lead
sheet to wrap tether wire in breakaway anchors shall be commercially pure lead
of thickness 0.030 to 0.042 inches (0.75 to 1.0 mm).
Furnish
materials according to the Department’s Qualified
Products List (QPL).
732.19 Cable and Wire.
Furnish cable and wire meeting the requirements of Table
732.19-1 and rated at 600 volts with conductors of copper unless otherwise
specified. Ensure that the cable or wire jacket is indelibly marked at
intervals of not more than 6 feet (2 m) with nomenclature stating the size, the
type, the organization specifying the type, and the manufacturer’s name or
trademark.
Furnish
materials according to the Department’s Qualified
Products List (QPL).
Cable or Wire |
Number of Conductors |
Wire Gage |
Specification |
Conductor Type |
Notes |
Signal Cable |
As specified |
As specified |
IMSA 19-1 IMSA 20-1 |
Copper, |
|
Interconnect cable |
As specified |
As specified |
IMSA 19-1 IMSA 20-1 |
Copper, |
|
Twisted pairs as specified |
As specified |
RUS PE-39 IMSA 19-2 IMSA 20-2 |
Copper, |
||
Interconnect cable, integral,
messenger type |
As specified |
As specified |
IMSA 19-3 IMSA 20-3 |
Copper, |
|
Twisted pairs as specified |
As specified |
IMSA 19-4 IMSA 20-4 |
Copper, |
[2] |
|
Loop detector wire |
Single conductor |
14 AWG |
IMSA 51-5 |
Copper, stranded |
|
Loop detector lead-in cable |
Two conductor |
14 AWG |
IMSA 50-2 |
Copper, twisted pair, stranded,
shielded |
|
Power cable |
Two conductor |
As specified |
UL: RHH/RHW/ USE or HHW, cross linked
polyethylene with an insulation thickness of 0.045 inch (1.14 mm) (min.) |
Copper, stranded |
[3] |
Service cable |
Two conductor (duplex) |
As specified |
Aluminum,[1] twisted, stranded |
||
Ground Wire |
Single conductor |
UL: RHH/RHW/USE or XHHW, cross linked
polyethylene |
Copper, stranded |
[4] |
|
Loop detector lead-in cable, direct
burial |
As specified |
12 or 14 AWG,
or as specified |
IMSA 19-6 IMSA 20-6 |
Copper, stranded |
|
Loop detector lead-in cable,
Integral messenger type |
As specified |
12 or 14 AWG,
or as specified |
IMSA 19-4 IMSA 20-4 |
Copper, stranded |
Notes
[1]
Copper conductors may be substituted
[2]
ANSI/ICEA Cable shall have: Solid insulations,
Full count color coding, 8-mil shield, and 772 kHz attenuation compliance. All
other specifications are manufacturer’s option unless specified.
[3] Three-conductor cable
may be specified. Permitted substitution: 2 (or 3)
single conductor cable.
[4]
Minimum size is equal to the power or service cable, whichever is
larger.
732.20 Power Service. Furnish risers for power service
that are 1 to 1 1/2-inch (25 to 38 mm) diameter conduit and fittings according
to 725 Furnish weatherheads that are threaded and made of aluminum or
galvanized ferrous metal. Include a disconnect switch with
enclosure.
732.21 Disconnect Switch with Enclosure. Ensure that the switch enclosure is a UL listed
watertight lockable stainless steel NEMA Type 4
supplied with the conduit hubs listed on the enclosure UL label. Furnish
an enclosure that contains as a minimum a single-throw, 2 pole, solid neutral,
fused safety disconnect switch (or circuit breaker) UL listed as suitable for a
service disconnect with a minimum capacity of 30-amperes at 240 VAC.
Ensure that the unit can be padlocked in both the “ON” and “OFF” positions.
Furnish materials according to the Department’s Qualified
Products List (QPL).
732.22 Backplates. Furnish louvered backplates
constructed of wrought sheet aluminum, according to ASTM
B 209 (B 209M), 6061-T6, .050 inch (1.3 mm) minimum thickness.
Louvers shall be at least 8 percent of the total backplate
area. Backplate base metal shall be anodized to
maximize paint adhesion according to Mil-A-8625,
Type II or Type I. Furnish backplates painted
on both sides with at least two coats of flat black alkyd enamel paint or
polyester powder coat (no epoxy) closely matching FED-STD-595b-37038.
Furnish a backplate that extends 5 inches (125 mm)
beyond the outside of the signal assembly on all sides. The overall outside
shape of the installed backplate shall be
rectangular. The backplate shall allow no gaps
between the backplate and the signal head or between
signal sections. A 2-inch (50 mm) wide continuous outside border of
fluorescent yellow reflective sheeting shall be applied to the front of the backplate. Border shall not be applied over the
louvers. Reflective sheeting shall be Type H or J listed on the Department’s Qualified
Products List. Prepare backplate surfaces in
accordance with 630.04 prior to
applying the reflective material. All assembly and mounting hardware shall be
stainless steel conforming to 730.10. If used, machine nuts
shall be thread-deforming or nylon locknuts. Rivets shall not be used for
mounting the backplate to the signal head. A
minimum of four mounting points shall be used on each signal section for
attaching the backplate. Furnish all mounting
hardware.