B08_-_Attachment_6_-_ARDOT_Specifications_Chapter_700.pdf

DIVISION 700

TRAFFIC CONTROL FACILITIES

SECTION 701

ACTUATED CONTROLLER

701.01 Description. This item shall consist of furnishing and installing an actuated controller and other associated equipment according to these specifications and at the locations shown on the plans or as directed.

701.02 Materials. (a) General. The controller, cabinet, and all accessories in the cabinet shall be furnished by one supplier. All controllers on a project shall be made by one manufacturer, shall be menu driven, and shall comply with the latest NEMA TS 1 or TS 2–

Type 2 specifications as specified in the Contract Summary of

Quantities. The supplier shall test the controller and all accessories in the cabinet as a unit before shipment to the Contractor.

The Contractor shall submit to the Engineer for approval two copies of the applicable brochures containing design criteria for the components. The specific items proposed for use shall be clearly marked in the brochures. If more than one item is submitted at one time for Department review, a list shall be attached showing each item for which Department approval of design characteristics is being requested. The Engineer will provide written approval of the design characteristics.

(b) Controller Design Requirements.

(1) Consistency of Intervals. The length of any interval, position, period, or unit extension shall not change by more than

5% of its value if the voltage of the power supply varies between the limits of 95 to 135 volts.

(2) Power. The controller and associated equipment shall be designed for use on 120 volt, 60 Hz alternating current.

(3) Mechanism. The timing circuits shall consist entirely of solid state electronic circuitry. No vacuum or gaseous tubes shall be used in any timing circuits.

Switching functions shall be accomplished by solid state electronic circuitry. No electromechanical devices such as camshafts and rotary, stepping, or line switches shall be used for switching functions.

Functional operating circuits and their associated components shall be grouped in plug-in, printed circuit assemblies. Similar assemblies shall be interchangeable between controllers.

The components shall be amply de-rated regarding heat-dissipating capacity and rated voltage so that, with maximum ambient temperature and maximum applied voltage, material shortening of life or shift in values shall not occur.

(4) Interval Sequence. The controller shall provide and be set up for the proper intervals and interval sequence as provided on the plans.

(5) Interval Setting and Adjustment. The controller shall provide for the setting up of each interval or period by means of thumbwheel dials, pins, or keyboard entry. There shall be, at a minimum, the following settings for each phase:

• Initial

• Extension (gap)

• Maximum (maximum green or extension limit)

• Yellow Change

• Red Clearance

• Walk

• Pedestrian Clearance

The settings shall be calibrated in seconds and shall give a clear visual indication of the length of each interval or period.

The timing setting devices and setting displays shall be on the front of the controller and easily identifiable. It shall not be necessary to remove or change wires or contacts or to use any tools in making interval adjustments.

Indications shall be provided for at least the following functions, but not limited thereto:

• Phase or phases in service.

• Phase or phases next to be serviced.

• Presence of vehicle call, including memory and detector actuation.

• Presence of a pedestrian call.

• The interval(s) timing and controller conditions.

(6) Pedestrian Interval. Unless otherwise noted, pedestrian intervals shall be push button actuated and concurrently timed with the associated phase.

(c) Cabinet.

(1) General. The controller shall be furnished completely housed in an aluminum alloy or stainless steel cabinet. The cabinet shall be of clean-cut design and appearance. The size of the cabinet shall be such as to provide ample space for housing the controller and associated electrical devices that are to be furnished with it, together with other auxiliary devices herein specified. A hinged door shall be provided, permitting complete access to the interior of the cabinet. When closed, the door shall fit closely to gasket materials, making the cabinet weather-resisting and dust tight. The door hinges and pins shall be of non-corroding material. The cabinet shall be equipped with an interior fluorescent light that switches on automatically when the cabinet door is opened.

The cabinet shall contain a mounting table, sliding ways, or other suitable support for the controller.

Cabinets shall not be painted unless otherwise specified.

Minimum cabinet size – The cabinet shall be large enough to allow trouble shooting of all terminal facilities while the intersection is in operation without removing any equipment from the cabinet. Stacking equipment or mounting active equipment

(detectors, radios, conflict monitor, etc.) on the door is not permitted. Cabinet size shall be based as a minimum upon the number of phases specified in the unit item table shown below.

In addition minimum cabinet volume and the minimum number of load sockets shall be equal to or greater than the following:

Table of Minimum Cabinet Requirements*

No.

Phases

Class

Det.

Inps.

Load

Sockets

Depth inches

(mm)

Width

(mm)

Height

(mm) Phase

(N)

OL Ped

2 G 4 2 2 16″

(400)

25″

(630)

41″

(1040)

3 M 8 3 3** 2 17″

(430)

30″

(760)

49″

(1240)

4 M-36 8 4 2** 2 17″

(430)

36″

(910)

49″

(1240)

5 M-36 16 5 4** 3 17″

(430)

36″

(910)

49″

(1240)

6 P-38 24 6 2** 4 26″

(660)

38″

(960)

55″

(1400)

7 P-38 24 7 1** 4 26″

(660)

38″

(960)

55″

(1400)

8 P-38 24 8 4 26″

(660)

38″

(960)

55″

(1400)

>8 or

“spec.”

R-44 24 12 12-N

4 26″

(660)

44″

(1120)

77″

(1960)

* Where additional Pedestrian phases are required, Overlap

(OL) sockets may be utilized for Pedestrian Signal outputs unless required as part of the specified phasing.

Intersections with overlaps, more than 2 rings, or other than standard quad left phasing may require additional load sockets. Addition of other auxiliary equipment may require the use of a larger cabinet.

**Detector inputs (Det. Inps.) are total including Pedestrian.

***Where designated as "Special" (spec.) phasing, N refers to number of phases.

(2) Locks. The main cabinet door shall have a tumbler lock keyed for a Corbin No. 2 key. The auxiliary door shall be equipped with a lock for a standard police key. When the door is closed and latched, with the key removed, the door shall lock.

The Contractor shall furnish two keys for each lock to the City or

County.

(3) Door Stop. The cabinet shall be equipped with a door stop assembly.

(4) Mounting. The cabinet shall be furnished with all the necessary mounting hardware for field mounting of the cabinet as specified or as shown on the plans.

(5) Fan and Ventilation. Each cabinet shall be provided with louvered vents and a permanent, washable, removable electrostatic filter with an aluminum frame, mounted in the front door. The filter shall meet the “American Society of Heating, Refrigeration, and Air Conditioning Engineers” (ASHRAE) testing requirements as follows:

Arrestance 90%

Dust Holding Capacity 85 grams at 0.5 water gauge

The cabinet shall also be equipped with an electric fan assembly with a minimum capacity of 100 cubic feet per minute

(2.8 cubic meters per minute).

The fan shall be mounted in the top of the cabinet in a manner to prevent rain from entering the cabinet. The fan shall be thermostatically controlled and shall be manually adjustable to turn on between 90° F (32° C) and 150° F (66° C).

(6) Grounding. A copper equipment grounding buss shall be provided in each cabinet. The ground buss shall be grounded to the cabinet and shall provide at least 14 terminals. The ground side of the power supply shall be bonded directly to a ground rod in the cabinet or pole base with a #8 AWG solid copper wire.

The wire path shall be as direct as possible and the wire shall contain no splices. The ground rod shall be as shown on the plans or as directed by the Engineer. The cabinet ground wire shall be connected to the ground rod by means of an approved thermal fusion type weld.

(7) Wiring. Panel wiring shall be neat and firm, and the panel shall mount at least:

• Terminal for power supply line.

• Terminal for neutral side of power supply line.

• Terminals for conductors of traffic signal cable: one for each signal circuit and one or more terminals for the common conductors.

The controller equipment and terminals shall be so arranged within the cabinet that they will not interfere with the entrance and connection of the incoming conductors.

All terminals shall be suitably identified and shall be permanently associated with the terminal block. Not more than 3 conductors shall be brought to any 1 terminal screw. No electrically alive parts shall extend beyond the protection afforded by the barrier.

Electrical connections from the controller to the outgoing and incoming circuits shall be made by inserting a multi-terminal plug (Type MS) into the plug receptacle incorporated in the controller. The controller shall be replaceable with a similar unit without the necessity of disconnecting and reconnecting the individual wires leading therefrom.

The controller cabinet shall be wired such that during flash operation, power to the load switches cannot back-feed to the load switch power buss.

(8) Surge Protection. The cabinet AC service must be provided with a series hybrid type protector (EDCO Model SHA-

1250 or equal) with the following terminals:

• Main Line (AC line first stage terminal).

• Main Neutral (AC Neutral input terminal).

• Equipment Line In (AC line second stage input terminal, 10 amps).

• Equipment Neutral Out (Neutral terminal to protected equipment).

• Ground (Earth connection).

Each messenger wire of interconnect cable shall also be provided with a series hybrid type surge protector connected between the interconnected line and the AC return.

Each loop detector input circuit (at cabinet entry point) shall be provided with a series hybrid type surge protector capable of protecting the detector against differential surges between the loop leads and common mode surges between leads and ground.

Each solid state load switch shall be provided with a series hybrid type surge protector capable of protecting the load switch against common mode surges.

(d) Cabinet Auxiliary Equipment.

(1) Conflict Monitor. The conflict monitor shall be a solid state device capable of detecting conflicting signal displays and/or improper power supply voltage from the controller. The conflict monitor shall comply with the latest NEMA TS 1 or

TS 2-Type 2 specifications for MMU operation according to the type of controller specified in the Summary of Quantities. All conflict monitors on a project must be made by one manufacturer.

When TS 2-Type 2 is required, in addition to the standard features required by TS 2 specifications, error sensing of 24 vdc cabinet supplies and controller power supplies shall also be provided. The conflict monitor shall communicate through or to the local controller for logging event monitoring. The monitor shall record in non-volatile memory, a minimum of 100 events with time/date and nature of event. The unit shall interface to a standard PC through an RS232 port. The agency maintaining the equipment and the Engineer shall each be provided with one copy of the software.

(2) Solid State Load Switch. The solid state load switches shall be used for opening and closing traffic signal circuits. The assemblies shall be external to the controller and shall be jack mounted. The load switches shall comply with the latest NEMA specifications. The cabinet shall be furnished with load switch sockets wired to provide all necessary signal output circuits plus any future expansion noted on the plans. There shall be at least one pedestrian load switch socket provided for each vehicle through phase.

(3) Solid State Flasher. The cabinet shall be furnished with a two-circuit solid state flasher. It shall be used for the alternate opening and closing connections between the applied power and the signal lamps required for flashing operations. The unit shall commence flashing operation when AC power is applied to the input terminals. It shall provide 50 to 60 flashes per minute on each output circuit and have equal on and off time. The flasher shall comply with the latest NEMA specifications.

(4) Flash Transfer Relays. Electromechanical or solid state relays may be used for opening and closing traffic signal field circuits.

Relays used for this purpose shall be covered, insulated, or located so that electrically alive parts are not readily exposed.

(5) Flash Sequence Programming. A programming means shall be provided to alter whether flashing yellow or red appears on the output field terminals to the signal heads. Programming may be accomplished with tools such as a screwdriver and wrench.

(6) Harness Wiring. All cabinet wiring harnesses shall be neat, firm, and routed to minimize crosstalk and electrical interference. Printed circuit mother boards may be used to reduce cabinet wiring.

Wiring containing AC shall be routed and bundled separately by function, or shielded separately by function, from all low voltage control circuits. All conductors and live terminals or parts that could be hazardous to maintenance personnel shall be covered with suitable insulating materials.

All vehicle detectors shall input the controller separately unless otherwise noted on the plan sheets. Controller and cabinet shall be wired to terminal facilities for the minimum number of detector inputs as indicated on the table “Minimum Cabinet

Requirements” above, including Pedestrian Push Buttons. Odd numbered Pedestrian Inputs may be shared as vehicle detector inputs unless utilized in the intersection operation. Controller shall be factory programmed to actuate the appropriate phase as shown on the plan sheets. A chart or table of detector number (as indicated on the plan sheet(s)) to controller input shall be provided to the Engineer prior to requesting time settings and placing the intersection into operation. All wiring harnesses required for expansion to the full capabilities of the controller for the number of phases specified in the unit item table shall be installed. A minimum of one single channel detector harness or detector rack position (whichever shall apply) for each phase shall be installed with a minimum of one wired in place on each

NEMA input. Terminal facilities as well as lightning suppression shall also be installed for each detector harness.

Optical isolators with a visual indication of an incoming call shall be provided for all external input devices, including

Pedestrian Push Buttons. Auxiliary Isolator/Indicators are not required on devices located within the controller cabinet that have self-contained isolators and indicators on the front panel.

(7) Power Panel. The cabinet shall have a power distribution panel containing a 50 amp radio interference suppressor, a

30 amp main circuit breaker, and a 15 amp auxiliary equipment circuit breaker.

(8) Police Panel. The main door of the cabinet shall have a small police panel door. Behind this door shall be a panel with a signal flash switch and a manual control switch and cord.

In the flash position, the signals flash switch shall cause the intersection to be placed in flashing operation. Stop time shall not be applied to the controller in the manual flash position.

(9) Maintenance Panel. There shall be a maintenance panel on the inside of the main door containing the following:

• Convenience outlet with GFI protection. (Note: The outlet may be mounted on the door panel or inside the cabinet).

• Signals switch.

• Controller switch.

• Detector Test Switches

Detector test switches shall be wired to each controller input required for vehicle detectors and pedestrian push switches. Test switches shall consist of momentary, normally open, push switches.

Separate non-GFI protected duplex receptacle(s) shall be provided for power supplies or other auxiliary equipment which must connect to 120 VAC line voltage. This is in addition to the

GFI provided receptacle provided above.

(10) Wiring Diagrams and Controller Manual. Three copies of the cabinet wiring diagram and one copy of the controller manual shall be supplied with each cabinet. One diagram and the manual shall be placed in a heavy duty clear plastic pouch and attached to the cabinet door. This pouch shall be of such design and material that it provides adequate storage and access to the wiring diagram and manual. One diagram shall be delivered to the City or County before final inspection of the intersection. One diagram shall be given to the Engineer.

(11) Time of Day Clock. All controllers shall have internal time of day programming with an internal time clock.

(e) Certification. The supplier shall provide to the Contractor a certification of compliance with the above requirements and that the controller and conflict monitor comply with the latest NEMA specifications. This certification shall be transferred to the

Department.

(f) Mounting Pad. When required, the mounting pad shall be constructed as shown on the plans or as directed by the Engineer.

701.03 Construction Requirements. The controller shall be

mounted as shown on the plans or as directed and shall in no case be located less than 3' (1 m) from the pavement edge.

The Contractor shall furnish and properly install each cabinet and controller with accessory equipment and perform the necessary splicing and connections, testing of circuits, adjustments, and such other operations as may be necessary to ensure that each complete traffic signal installation, with all of its components, be completely integrated and tested as a unit so that the desired control of the intersection is attained, complete, and in the best of working order, to the satisfaction of the Engineer. The Contractor shall meet with the City or County and provide them with instructions on the adjustments of the controller and provide consultation for replacement parts stocking.

701.04 Method of Measurement. Actuated Controllers will be

measured by the unit. One unit shall include the controller; the controller cabinet; the pad on which the cabinet is installed, when required; and all hardware required for installing the cabinet.

701.05 Basis of Payment. Work completed and accepted and

measured as provided above will be paid for at the contract unit price bid per each for Actuated Controller of the phases and the

NEMA TS type specified, which price shall be full compensation for furnishing the Actuated Controller and mounting the controller cabinet; for installing, wiring and testing the controller; for excavation and backfilling; for construction of the mounting pad;

and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.

Payment will be made under:

Pay Item Pay Unit

Actuated Controller TS 1 (___Phases) Each

Actuated Controller TS 2-Type 2 (___Phases) Each

SECTION 702

PRE-TIMED CONTROLLER

702.01 Description. This item shall consist of furnishing and installing pre-timed, solid state, digital timed, multidial traffic signal controllers according to these specifications and at the locations shown on the plans or as directed.

702.02 Materials. (a) General. The controller, cabinet, and all accessories in the cabinet shall be supplied to the Contractor by one supplier and shall comply with the latest NEMA specifications. All controllers on a project must be made by one manufacturer. The supplier must test the controller and all accessories in the cabinet as a unit before shipment to the Contractor.

The Contractor shall submit to the Engineer for approval two copies of the applicable brochures containing design criteria for the components. The specific items proposed for use shall be clearly marked in the brochures. If more than one item is submitted at one time for Department review, a list shall be attached showing each item for which Department approval of design characteristics is being requested. The Engineer will provide written approval of the design characteristics.

(b) Controller Design Requirements.

(1) Functional Requirements. The controller shall be designed to operate as a pre-timed isolated intersection controller or an interconnected multidial controller.

The controller operation shall be completely solid state. The controller shall have the capability of maintaining time settings with the loss of applied AC power.

The controller shall be capable of providing a minimum of 3 different cycles, 3 offsets per cycle, 4 splits per cycle, and

3 signal plans with individual control of at least 24 signal output driving circuits in each of the intervals. These functions shall be accomplished by a microprocessor to implement the control logic and modular construction with keyboard entry of operating data.

(2) Cycle Lengths. The controller shall be capable of operating on a minimum of 3 manually or remotely selectable dials, each programmable to a maximum length of 255 seconds in

1 second increments. The duration of each cycle shall be entered into the controller memory by a front panel control.

Dial transfer from one dial to another shall occur at the end of the timing interval in effect at the time of request for transfer.

Intervals may be programmed to inhibit transfer. Dial transfer shall cause no irregular interval timing or out of step operation of the controller.

(3) Offsets. Each dial shall be capable of being programmed with up to 3 offsets. Each offset shall be remotely or manually selectable.

Offsets shall be programmable from 0 to 255 seconds in

1-second increments. An offset shall be the time from the receipt of a synchronization pulse to the beginning of the dwell interval.

Offset timing may be in terms of percent of cycle as well as seconds. It shall be possible to program the signal display interval in which a re-synchronization dwell occurs. It shall also be possible to program the maximum time duration of the dwell per dial. The maximum time duration shall be set independently for each dial.

(4) Interval Timing. The controller shall allow signal sequences to be programmed up to 24 intervals. Each interval can be 0.0 to 12.7 seconds in length in 0.1 second steps or 0 to

127 seconds in 1 second steps. Interval times are entered through the front panel. Interval timing may be in percent of cycle or in seconds.

Interval times may be entered for up to 24 intervals for each of the cycle lengths. No intervals shall be required to be set to zero time as the signal sequence can be programmed to the exact number of timing intervals without the necessity of establishing dummy intervals. Intervals programmed to zero time shall be skipped.

(5) Sequence Control. Each controller shall have a programmable sequence and display control element. This element shall allow for programming at least 24 signal output driving circuits in 24 different interval display combinations.

The sequence control element shall be a non-volatile memory device (programmable read only memory, PROM) mounted for ease of removal.

(6) Front Panel Displays and Features. The front panel display shall be either an LED or LCD Decimal Digital Display that will display intervals, interval durations, cycles, offsets, and dwell maximum duration.

Ranges

• Cycle 0-255 seconds

• Offset 0-255 seconds

• Interval 1-24

• Interval time 0-127 seconds

• Dwell 0-99.9 seconds

The indicators on the front panel shall be as follows:

• Clock. A timing indicator shall be provided on the front panel of the controller. This timing indicator shall pulse each second as long as the controller is timing. Pulsing shall be inhibited when the controller is dwelling, in manual synchronization, and/or in manual operation.

• Stop-Timing. An indicator on the front panel shall show that the unit is in the stop timing mode.

• Offset. Indicators shall show the offset that is currently being selected.

• Dial. Indicators shall show which of the dials is currently active.

(7) Remote Operations. The controller shall be capable of remote operation from a master controller of the same design that allows for 3 cycles, 3 offset per cycle operation.

The unit can be installed in a standard multidial, 3 cycle, 3 offset system that utilizes a solid state master controller and

120 VAC interconnection or other type of interconnection that outputs Dial 2, Dial 3, Offset 1, Offset 2, Offset 3, and Flash.

The controller shall work in systems when a momentary (0.5 to 2.0 second) absence of offset input is identified as a synchronization pulse.

The controller shall operate in interconnected systems with centrally located offset interruptions.

(c) Cabinet. The cabinet shall comply with

Subsection 701.02(c).

(d) Cabinet Auxiliary Equipment. The Cabinet Auxiliary

Equipment shall comply with Subsection 701.02(d).

(e) Certification. The supplier shall provide a certification to the

Contractor of compliance with the above requirements and that the controller and conflict monitor comply with the latest NEMA specifications. This certification shall be transferred to the

Department.

(f) Mounting Pad. When required, a mounting pad shall be constructed as shown on the plans or as directed by the Engineer.

702.03 Construction Requirements. The solid state controller

shall be mounted as shown on the plans or as directed by the

Engineer, and shall in no case be located less than 3' (1 m) from the pavement edge.

The Contractor shall furnish and properly install each cabinet and controller with accessory equipment and perform any and all necessary splicing and connections, testing of circuits, adjustments, and such other operations as may be necessary to ensure that each complete traffic signal installation, with all of its components, be completely integrated and tested as a unit so that the desired control of the intersection is attained, complete, and in proper working order and to the satisfaction of the Engineer. The Contractor shall meet with the City or County and provide them with instructions on the adjustments of the controller and provide consultation for replacement parts stocking.

702.04 Method of Measurement. Pre-Timed Controllers

(Local, Local/Master) will be measured by the unit. One unit shall include the controller; the controller cabinet; the pad on which the cabinet is installed, when required; and all hardware required for installing the cabinet.

702.05 Basis of Payment. Work completed and accepted and

measured as provided above will be paid for at the contract unit price bid per each for Pre-Timed Controller (Local, Local/Master), which price shall be full compensation for furnishing the cabinet and controller; for mounting the controller cabinet; for installing, wiring, and testing the controller; for excavation and backfilling; for construction of the mounting pad; and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.

Payment will be made under:

Pay Item Pay Unit

Pre-Timed Controller

(Local, Local/Master) Each

SECTION 703

FLASHING BEACON CONTROLLER

703.01 Description. This item shall consist of furnishing and installing solid state flashing beacon controllers according to these specifications and at the locations shown on the plans or as directed.

703.02 Materials. Single or two circuit flashers, whichever is specified, shall be provided with a dust-tight and weatherproof aluminum alloy or stainless steel cabinet. Cabinets shall not be painted unless otherwise specified.

The cabinet shall be adaptable for mounting the flashing unit conveniently and easily. The door on the controller cabinet shall be provided with a standard locking device. The Contractor shall furnish two keys for the lock to the City or County.

The flashing unit shall be a solid state, plug-in type flasher requiring no lubrication. The flashing unit shall include a radio interference suppressor. A 30 amp circuit breaker shall be installed in the controller cabinet.

Each flashing unit shall be designed for a minimum 10 amp load with an operating voltage of 115 VAC, 60 Hz. The flasher shall be capable of providing 50-60 flashes per minute. The illuminated period of each flash shall not be less than 1/2 and not more than 2/3 of the total cycle. The unit shall be compact and readily accessible inside the cabinet.

A timing device regulating periods when the controller is operative shall be provided when specified.

The Contractor shall submit to the Engineer for approval two copies of the applicable brochures containing design criteria for the components. The specific items proposed for use shall be clearly marked in the brochures. If more than one item is submitted at one time for Department review, a list shall be attached showing each item for which Department approval of design characteristics is being requested. The Engineer will provide written approval of the design characteristics.

703.03 Construction Requirements. The flashing unit, with

cabinet, shall be mounted as shown on the plans or as directed.

703.04 Method of Measurement. Flashing Beacon Controllers

will be measured by the unit.

703.05 Basis of Payment. Work completed and accepted and

measured as provided above will be paid for at the contract unit price bid per each for Flashing Beacon Controller, which price shall be full compensation for furnishing, installing, and wiring the controller; for mounting the cabinet; and for furnishing all materials, labor, equipment, tools, and incidentals necessary to complete the work.

Payment will be made under:

Pay Item Pay Unit

Flashing Beacon Controller Each

SECTION 704

LOOP DETECTOR

704.01 Description. This item shall consist of furnishing and installing vehicle detectors and/or rack mounted vehicle detectors, loop wiring and/or preformed detector loops, and necessary feeder wire according to these specifications and at the locations shown on the plans or as directed.

704.02 Materials. (a) General. Each loop detector shall be

composed of all components necessary to provide for the detection of vehicles constituting one traffic phase and shall include an electrical surge protection device.

Each vehicle detector shall be supplied complete with comprehensive instructions. The instructions shall be placed in the controller cabinet.

The term "vehicle detector" as used in these specifications shall refer to the pulse amplifying unit located in the controller cabinet.

The term "loop wiring" as used in these specifications shall refer to the sensing element and single conductor wire from the sensing element to the feeder wire. The wire shall be 14 gage stranded copper wire and shall be insulated with RHH or RHW USE rated insulation not less than 0.045" (1.1 mm) thick.

The term "feeder wire" as used in these specifications shall refer to the shielded 1, 2, or 4 pair 14 gage stranded copper wire extending from the detector unit to the loop wiring at the curb or pavement edge. The wire in each pair shall be twisted and each pair shall be shielded. Each loop shall have a separate feeder wire unless noted otherwise on the plans.

All vehicle detectors at a given intersection shall be housed inside the controller cabinet for that intersection.

The Contractor shall submit to the Engineer for approval two copies of the applicable brochures containing design criteria for the components. The specific items proposed for use shall be clearly marked in the brochures. If more than one item is submitted at one time for Department review, a list shall be attached showing each item for which Department approval of design characteristics is being requested. The Engineer will provide written approval of the design characteristics.

(b) Vehicle Detector Requirements. Vehicle detectors shall:

• be designed to operate satisfactorily in temperatures ranging from -30° F to +140° F (-34° C to +60° C),

• be designed to operate satisfactorily on line voltage ranging from 100 to 130 VAC,

• operate on 115 VAC, 60 Hz power,

• be so designed that the detector, operating in the pulse mode, will ignore a vehicle parked over a loop or portion thereof in 30 to 180 seconds. After ignoring the parked vehicle, the remainder of that loop shall detect additional vehicles,

• be capable of giving detection signals persisting for up to 5 minutes if a vehicle stops and remains over the loop when operating in the presence mode,

• be capable of detecting vehicles ranging in size from a motorcycle to a large tractor trailer,

• be designed to run feeder wire in common conduit with signal and interconnect cable without interference, and

• be capable of driving 1 or 2 loops over a feeder length totaling up to 600 feet (180 m).

• be equipped with optical coupled or relay output circuts.

• be equipped with transformer isolation for loops.

• be equipped with high intensity LED indicators.

• be equipped with continuous loop monitor

• be equipped with time delay (where specified in the plans)

“With Count” specified detectors shall meet the above requirements and the “Count Output” function shall provide a separate pulse for each vehicle entering the loop detection zone to a separate controller input (in addition to the standard detector output).

(c) Electrical and Mechanical Requirements. The vehicle detector unit shall be:

• plug connected to controller terminal facilities,

• completely self contained, self tuning, and shall not require external power supplies other than line voltage, and

• of a design suitable for shelf mounting inside the controller cabinet.

(d) Preformed Detector Loops. This item shall be constructed utilizing an approved preformed loop listed on the Department’s

Qualified Products List.

The preformed detector loop shall be constructed of #20 AWG

(minimum) stranded copper wire, encapsulated in a flexible sealant inside a reinforced 250 psi (1724 kPa) rubber hose or approved tubing. No wire splices will be allowed in the loop assembly. Hose for the loop and lead-in shall be one continuous piece except for the required tee connectors. Encapsulated wire shall have two (2) turns for loops with a perimeter greater than 40′ (12 m); or three (3) turns for perimeter less than or equal to 40′ (12 m). Quadrupole loops shall be two turn (2-4-2) configuration.

(e) Rack Mounted Vehicle Loop Detectors. Rack mounted vehicle detectors shall consist of the following principal components: two (2) or four (4) channel vehicle detector (card rack type); power supply unit (card rack type); and card rack (for plug-in modules). The components shall have the features shown below.

(1) Vehicle Detectors – Rack Mount. The single module will operate the detectors from a 24 VDC supply. Each detector shall meet the requirements of (b) above and the following:

• Connectors shall consist of double sided edge card connectors.

• “With Count” detectors shall provide two standard detector outputs and two count outputs to insert into a four channel rack position.

(2) Power Supply Unit. The power supply unit shall be a card rack type with an input voltage of 90 – 135 VAC, 60 Hz.

Output voltage shall be unregulated DC. The unit shall contain high intensity LED indicators and one power switch that switches input line voltage for all channels. The unit module shall be fully compatible with the rack mounted vehicle detectors and other associated equipment.

(3) Card Rack. The vehicle detector card rack shall be constructed of lightweight anodized aluminum with mounting flanges to allow mounting of the rack either above or below the controller cabinet shelf. Each rack shall accommodate a minimum of two – 4 channel power supply units and up to eight

– 2 channel detector units. Each rack shall be able to hold a maximum module size of 4.5″ x 6.875″ (115 mm x 175 mm).

The connector wire shall be #22 AWG-Type UL 1015-1050C.

The rack unit shall be fully compatible with the digital loop detectors and other associated equipment.

704.03 Construction Requirements. (a) General. The vehicle

detectors, loop wiring, and feeder wire shall be installed as shown on the plans or as directed by the Engineer. The loop wiring shall be installed in a sawed slot 1/4" to 3/8" (6 mm to 10 mm) wide, 2½"

(65 mm) minimum depth in asphalt or 1½" (40 mm) in concrete, or as indicated on the plans. In no case shall the wire be less than 1¼"

(32 mm) below the final pavement surface. Before sealing the slot, the wire shall be held down by backer rod wedges inserted into the slot at a maximum of 2' (0.6 m) intervals.

Loop wiring shall be tested by the Contractor according to the procedures outlined on the plans.

There shall be no splices in the feeder wire or the loop wiring.

The backer rod and sealant used shall be listed on the QPL. The installation procedures shall be according to the manufacturer's recommendations.

(b) Preformed Detector Loops. Preformed Detector Loop shall be designated by the perimeter size and configuration. The

Contractor shall be responsible for determining the length of lead-in from loop to connection with feeder wire. Lead-in from feeder wire to the loop shall be considered incidental to the Preformed Detector

Loop.

The preformed loop shall be placed in a saw-cut slot of sufficient width (approximately ½″ [6 mm] to ¾″ [19 mm] in width) to a depth such that the top of loop is a minimum of 4″ (100 mm) below the final surface, for the entire length of the trench. The maximum width of any loop trench shall be 1½″ (38 mm). The minimum width shall be 1/8″ (3 mm) larger than the outer diameter of the preformed loop. Larger widths shall be used for couplings, tees, and ells but not to exceed the maximum width. The corners of the trench should be chiseled to remove the sharp edge. The Engineer may approve other methods of trenching.

Where the road surface is to be overlaid, the preformed detector loops shall be installed prior to final surface. The Contractor shall seal and compact the loop trench completely with a material and/or sealant recommended by the loop manufacturer. The recommended material shall be able to repair asphalt and concrete roads and not require removal and/or replacement if the pavement is to be overlaid. Where surface is not to be overlaid, an approved sealer shall be applied to backfill the preformed loop trenches as needed to a minimum depth of 3/8″ (10 mm). The approved material shall have a minimum settlement period of 14 days prior to each backfill application.

The connection of the loop lead-in to the feeder wire shall be soldered and completely sealed in an approved manner against entry of moisture into the splice, jacket of loop and feeder wire. The preformed detector loop shall be tested for meg and continuity according to the procedures outlined on the plans and each feeder wire shall be clearly labeled with the phase designation.

(c) Rack Mounted Vehicle Detectors. Wiring diagrams for the vehicle detector channel assignment shall be provided to the

Department for approval prior to the delivery of the controller cabinet to the Contractor.

The vehicle detector card rack’s mounting flanges shall be turned out on each rack and the power supply modules shall be located on the left side when viewed from the front.

All output channels available from the card rack, including unused channels, shall be brought out to the terminal strips for future use. This shall include providing terminals for future detector loops. Where unused system detector inputs to the controller are available, these shall be tied to unused detector channels or brought out to the terminal facilities.

If approved by the Engineer, 2-channel units may be used in combination with 4-channel units in order to reduce the number of unused channels. This may be allowed provided that the possibility of cross talk will not be increased.

704.04 Method of Measurement. Items will be measured as

follows:

(a) Vehicle Detectors will be measured by the unit.

(b) Loop Wiring will be measured by the linear foot (meter).

(c) Feeder Wire will be measured by the linear foot (meter).

(d) Preformed Detector Loops will be measured by the unit for the size, type, and number of turns specified. Size shall be designated by length and width dimensions. Type shall be Q for quadrupole configuration (2-4-2) and blank for standard configuration.

(e) Vehicle Detector - Rack Mount will be measured by the unit for the number of standard vehicle detector channels provided.

(f) Vehicle Detector - Rack Mount, with Count will be measured by the unit for the number of standard vehicle detector channels provided (including one separate count output channel). No separate payment will be made for count output channels.

(g) Vehicle Detector - with Count will be measured by the unit for the number of standard vehicle detector channels provided

(including one separate count output channel). No separate payment will be made for count output channels.

704.05 Basis of Payment. Work completed and accepted and

measured as provided above will be paid for as follows:

(a) Vehicle Detectors will be paid for at the contract unit price bid per each for Vehicle Detector, or Vehicle Detector-with Count, which price shall be full compensation for furnishing, mounting, and installing the detector; and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.

(b) Loop Wiring will be paid for at the contract unit price bid per linear foot (meter) for Loop Wiring, which price shall be full compensation for laying the loop wiring in place and connecting to the appropriate feeder wire; for sawing and sealing as appropriate;

and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.

(c) Feeder Wire will be paid for at the contract unit price bid per linear foot (meter) for Feeder Wire, which price shall be full compensation for laying the feeder wire in place and connecting to the appropriate vehicle detector and loop wiring; for pulling wire through conduit; and for all materials, labor, equipment, tools, and incidentals necessary to complete the work.

(d) Preformed Detector Loops will be paid for at the contract unit price bid per each for Preformed Detector Loop (__′ x __′) (__ m x

__m), which price shall be full compensation for sawing and sealing; clearing the slot; removal of surplus material; placing the preformed detector loop in place and connecting to the appropriate feeder wire; and for all materials including the preformed loop, asphalt or sealer material, coupling and connectors; and for all labor, equipment, tools, and incidentals necessary to complete the work.

(e) Rack Mounted Vehicle Detectors will be paid for at the contract unit price bid per each channel for Vehicle Detectors-Rack

Mount or Vehicle Detectors-Rack Mount, with Count, which price shall be full compensation for furnishing and installing the detector card rack, power supply, detector cards, and for all equipment, tools, labor, and incidentals required to complete the work.

Payment will be made under:

Pay Item Pay Unit

Vehicle Detector Each

Vehicle Detector-with Count Each

Loop Wiring Linear Foot (Meter)

Feeder Wire Linear Foot (Meter)

Preformed Detector Loop (__′ x __′)

(__ m x __m) Each

Vehicle Detector-Rack Mount Each

Vehicle Detector-Rack Mount, with

Count Each

SECTION 705

LOOP WIRING IN DUCT

705.01 Description. This item shall consist of furnishing and installing vehicle detector loop wiring according to these specifications and at the locations shown on the plans or as directed.

705.02 Materials. The term "loop wiring" as used in these

specifications shall refer to the sensing element (loop), which is the single conductor wire coming from and going to the feeder wire at the curb or pavement edge. Loop wiring shall consist of 14 gage, stranded XHHW or THHN 600V wire completely enclosed in a

PVC or polyethylene tubing having a 3/16" (4.75 mm) I.D., 1/4"

(6.35 mm) O.D., and a wall thickness of 1/32" (0.8 mm). Loop wiring in duct shall comply with the latest requirements of

International Municipal Signal Association Specification No. 51-5.

The tubing shall be capable of resisting deterioration from oils and solvents. The tubing shall also be highly abrasion resistant and have a smooth bore.

705.03 Construction Requirements. The loop wiring shall be

installed in a sawed slot 3/8" (10 mm) wide by 2½" (65 mm) deep cut in the roadway surface. The loop wire shall be inserted into the tubing for the full length from the point of splicing at the curb or pavement edge and placed into the slot with the number of turns as shown on the plans or as directed by the Engineer. Twisting of loop wire from the perimeter of the loop to the pull box is not required.

The tubing shall be of a continuous length from the point of splicing of the loop wire to the feeder wire. No splices will be made in the tubing or loop wiring. The ends of the tubing shall be sealed to prevent any entrance of moisture into the tubing. The electrical splice between the loop wiring and feeder wire shall consist of providing a watertight protective covering for the spliced wire, the shielding on the feeder wire, and the end of the tubing containing the loop wiring. To eliminate floating when the sealant is poured, the tubing shall be held down by wedges inserted into the slot on 2'

(0.6 m) centers. The wedges shall be 1" (25 mm) sections of plastic tubing, folded before insertion. The sealant used shall be listed on the QPL. The installation procedures shall be according to the manufacturer's recommendations.

705.04 Method of Measurement. Loop Wiring in Duct will be

measured by the linear foot (meter).

705.05 Basis of Payment. Work completed and accepted and

measured as provided above will be paid for at the contract unit price bid per linear foot (meter) for Loop Wiring in Duct, which price shall be full compensation for furnishing and installing the loop wire and protective tubing; for sawing and sealing the slot; for splicing the wires complete in place; and for furnishing all labor, equipment, tools, and incidentals necessary to complete the work.

Payment will be made under:

Loop Wiring in Duct Linear Foot (Meter)

SECTION 706

TRAFFIC SIGNAL HEAD

706.01 Description. This item shall consist of furnishing and installing 12" (300 mm) diameter traffic signal heads of the type specified and according to these specifications and at the locations shown on the plans or as directed.

706.02 Materials. (a) General. Each traffic signal head shall consist of an assembly of one or more signal faces and the necessary mounting brackets and hardware.

Each signal face shall consist of an assembly of signal sections in sufficient quantity to provide the required number of indications.

The sections shall be joined together in a manner that provides both mechanical integrity and a weatherproof unit.

Each signal section of a signal face shall consist of a housing, door, visor, and optical assembly. The housing, door, and lens, together with necessary gaskets, shall constitute a weatherproof unit.

The lens and the remainder of the optical assembly, together with necessary gaskets, shall constitute a dust-tight assembly.

Each signal section and its associated optical system shall be capable of operating satisfactorily with the section's axis either vertical or horizontal.

Each signal section shall be provided with openings in the top or bottom for mounting purposes. Each opening shall be round to accommodate 1½" (40 mm) pipe. Each unused opening shall be closed with a gasketed plug.

Each signal face shall be capable of being rotated 360° about its vertical axis and shall be capable of being locked at 5° intervals.

Locking shall be accomplished by the engagement of serrations in the end signal sections with similar serrations in the mounting bracket assembly.

Signal indications shall be assembled according to the latest revisions of the MUTCD.

The Contractor shall submit to the Engineer for approval two copies of the applicable brochures containing design criteria for the components. The specific items proposed for use shall be clearly marked in the brochures. If more than one item is submitted at one time for Department review, a list shall be attached showing each item for which Department approval of design characteristics is being requested. The Engineer will provide written approval of the design characteristics.

(b) Optical Unit. Each optical unit shall consist of an assembly of a lens, reflector, lamp, lamp socket, and other components as required. The optical assembly together with the necessary gaskets shall constitute a dust-tight assembly that shall be designed to give clear visible signal indications within an angle of at least 45° and from 10' to 300' (3 m to 90 m) under all light and atmospheric conditions. The optical assembly shall be designed to minimize the return through the lens of outside light entering the lens at low sun angles to prevent the effect termed Sun Phantom.

Lenses shall be of the color indicated, circular in shape, and made of either glass or ultraviolet stabilized plastic. The composition must be durable on prolonged exposure to weather and all lenses shall be uniformly colored throughout the body of the material, true to size and form, and free from any defects that in any way detract from their efficiency or use. Each lens shall be so designed and manufactured that, when installed in a standard traffic signal, it will satisfy the minimum requirements for candlepower distribution and intensity and chromaticity as specified by the ITE. When mounted, the lens shall have a visible diameter of not less than 11½"

(292 mm) as shown on the plans. Lenses shall be marked to indicate the top.

The reflectors shall be of Alzak aluminum and shall comply with the specifications of the ITE Technical Report #1. Aluminum reflectors shall be of high purity aluminum, spun to shape and treated by the Alzak Process. The reflectors shall be of the pressure type, free floating, and must ensure full seal against the lens gasket.

Reflectors shall be mounted in a cast aluminum reflector support attached to the housing, or shall be an integral reflector and support of formed sheet aluminum, or shall be supported in such a fashion that the alignment of all optical…