393 SECTION 772
772.01 Description
This work consists of furnishing and installing flashing beacons and traffic signals.
772.02 Equipment
Item Section Air Compressor 156.01
772.03 Materials
A.General. Item Section Concrete, Class AE 802 Rapid -Hardening Cementitious Materials 806.01 Galvanizi ng 854 Highway Traffic Signals 896 The Department defines words and phrases as defined in Section 1 “Definitions” of the NEMA Standard Publication No. TS 2 Traffic Control Assemblies with NTCIP Requirements and Part 1 “Definitions” of NEMA Standards Publication TS -1 Traffic Control Systems to interpret these Specifications .
B.Work Drawings. Submit work drawings a maximum of 50 days after the date of award of contract. Provide the following with the work drawings, provide: − The dimensions; − Type of material; − The functional characteristics of the equipment to be installed; and − Any manufacturer warranties and guarantees listing the Department as the owner. Submit work drawings for the following listed items:
1.Conductors;
2.Pull Box;
3.Saw Slot Sealant;
4.Feed Point Equipment including:
a.Safety switch and lightning protection device;
b.Flasher;
c.Time Clock; and
d.Cabinet.
5.Traffic Signal Standards including all necessary calculations and drawings used in designing these poles; 394 6. Combination Standards including all necessary calculations and drawings used in designing these poles;
7.Traffic Signal Heads;
8.Beacon Heads;
9.Pedestrian Signal Heads;
10.Pedestrian Push Button;
11.Traffic Signal Controller cabinet with all components including, when required: a. Controller;
b.Flashers;
c.Conflict Monitor;
d.Coordination Equipment;
e.External Logic Unit;
f.Solid State Load Switches;
g.Detector Amplifier;
h.Lightning Protection Device; and
i.Cabinet.
12.Emergency Vehicle Pre-Emption Equipment; and
13.Painting method and type.
C.Certificate of Compliance. Submit a certificate of compliance that states all components of the LED signal modules meet the ITE standards.
D.Wiring Diagrams. At the time the cabinet and control equipment is accepted, furnish a traffic signal cabinet wiring diagrams showing all circuits and parts in detail. Place the wiring diagram in the signal cabinet and submit one PDF copy to the Engineer. Provide wiring diagrams that contain all the control equipment and their associated connecting cables and termination points. Identify each wire in each connecting cable on the wiring diagram as to its function and terminal number. At each terminal on the wiring diagram, list the cable designation and connector letter or number of the wire terminated at that point. Include the location of all control equipment, terminals, etc., within the cabinet as well as an intersection layout showing the location of vehicle signal faces, pedestrian signal indications, loop detectors, pedestrian push buttons, etc., all labeled as shown on the plans. Include the location of all control equipment, terminals, etc., within the cabinet as well as the intersection layout showing the location of vehicle Include in the main cabinet wiring diagram the logic (schematic) diagram of the following as required:
1.In and Out Flash Circuitry;
2.Detector Paralleling Circuitry;
3.Detector Time Delay Circuitry;
4.Calling Detector Circuitry;
5.Coordination Interface Circuitry;
6.Not Adding Initial During Non-Automatic Circuitry;
7.Actuated Permissive Yield Period Circuitry;
8.All other logic diagrams contained in the external logic assembly unit; and 395 9. Emergency Vehicle Pre-Emption Circuitry and Interface Points.
E.Service Manuals. At the time the cabinet and control equipment is delivered, furnish two service and operating manuals for the traffic signal controller unit and emergency vehicle pre-emption controller. Place one manual in the signal cabinet and submit the other to the Engineer. Furnish service manuals that include the following minimum information:
1.Detailed description of operation and instructions for initial set-up;
2.Recommended servicing and service hints;
3.Complete parts list; and
4.Recommended spare parts list.
772.04 Construction Requirements
A.General. All electrical installations must be either performed by or supervised by a licensed electrician. Perform all work to meet the requirements of the National Electrical Code, the North Dakota State Electrical Board, the local utility company, and the ordinances established by the local municipality. Provide and bear all costs for the electrical service necessary to operate and maintain the traffic signal system until the system is accepted as specified in “Supplemental Inspections and Final Acceptance” .
B.Concrete Foundations. Construct concrete Foundations that meet Section 770.04 C, “Concrete Foundation” . Place concrete foundations to provide the greater minimum horizontal and vertical clearances between the signal standards/mast arms/appurtenances and power lines required by the National Electric Code (NEC), or the power line voltages shown in Table 772-01. Table 772 -01 Power Line Voltage (kV) Horizontal Clearance Vertical Clearance 0 - 22 5 ft 6 ft Greater than 22 5 ft + 0.033 ft per kV greater than 22 kV 6 ft + 0.033 ft per kV greater than 22 kV Do not adjust the plan foundation locations without the approval from the Engineer.
C.Conduit. Install conduit as specified in Section 770.04 D, “Conduit” . Install an additional 2 inch conduit in each traffic signal standard foundation and traffic signal cabinet foundation as directed by the Engineer. Place a label on the additional conduits indicating the cardinal direction the conduit runs. 396 D. Conductors and Cables.
1.General. Pull all cables through conduit by hand without causing strain to the cable or conduit. Install wire entrance fittings. Use rubber sleeves fittings with clamps to protect the wire through the wire entrances on the signal standards and mast arms. Splicing is only permitted in traffic signal standards, pull boxes, and feed points. Perform only compression type splices. Only terminate cables at meter box, signal standards, or other equipment. Connect cables with sufficient slack to prevent any strain on the cable or connections. Install additional cable quantities to provide for slack and the wiring of cabinets, feed points, and signal heads as follows:
a.Nine feet at the cabinet;
b.Fifteen feet at post-mounted and pedestal -mounted vehicular signal heads;
c.Twelve feet at post-mounted and pedestal -mounted pedestrian signal heads;
d.Eight feet at each pedestrian push button;
e.Fifteen feet at each flashing beacon sign support;
f.Twenty -three feet at each signal pole with mast arm plus the length of the mast arm;
g.Ten feet at the feed point;
h.Five feet at each foundation for each incoming and outgoing pedestrian and signal head control circuit;
i.Six feet at pull boxes where connections are made; and
j.Three feet at each foundation for each incoming and outgoing circuit which passes through the foundation with no connection being made. Ground all bases, signal standards, control cabinets, feed points, and any exposed metal parts. Provide bolted pressure connectors to all ground rods. Protect cable from moisture during installation. Identify the function of each cable and label each cable accordingly. In all bases, signal standards, control cabinets, feed points, and pull boxes. Make all necessary wiring connections.
2.Traffic Signal Control Circuits.
a.Install unspliced, No. 16 AWG, two-conductor cable from each pedestrian push button to the controller cabinet.
b.Install control cables running from the terminal block in each traffic signal standard base to each traffic signal head. Install No. 14 AWG, three-conductor cable for each two-section pedestrian head, No. 14 AWG, five-conductor cable for each three-section and four -section vehicular head, and No. 14 AWG seven-conductor cable for each five section vehicular head.
c.Install terminal blocks for connections of control circuits in signal standard bases. 397 d. Do not splice traffic signal control circuits.
3.Loop and Loop Lead-In Conductor. For preformed loop detectors, seal the conduit end inside the pull box to prevent water from entering the conduit.
E.Installation of Loop Detectors.
1.General. Install the road loop in a manner that will minimize interruptions to the normal flow of traffic. Do not begin work until all material, equipment, and personnel are at the site.
2.Layout. The Engineer will mark the loop detector locations before installation.
3.Pull Box. Install conduit from the pull box to the gutter or roadway edge. Install a separate conduit for the pull box entry for each loop. Make the excavation from the saw slot at the gutter or roadway edge by means of a punch or drill type tool, rather than by usual excavating methods. Do not cut the visible portion of the gutter for conduit installation. Install the conduit to directly receive the loop wire in line and not at an a ngle. Use the same sealant over the conduit as the sealant used to close the saw cut.
4.Saw Cut. Saw the pavement slot with a self-propelled power saw equipped with a depth gauge and alignment guide. Ensure the pavement slot is cut cleanly without uneven or jagged edges. Clean slots immediately after the cutting operation. Place wooden strips in the cut or place a durable cover to prevent slot shrinkage or damage before the wire is installed.
5.Wire Installation. Install the wire loops in a clean and d ry slot. Clean wire slots using a compressed air. Use a constant connection scheme for the color -coded, shielded loop lead-in wire throughout the intersection. Coil a minimum of 6 feet of slack for loop wire pairs and leave it in the pull box. Do not use a sharp-pointed tool to install the wire. Hold the wire in place with short strips of polyethylene foam sealant backing placed over the wire at approximately every 2 feet. Leave these strips in place while the sealant is poured.
6.Initial Testing. Before installing sealer, perform the following in the presence of the Engineer.
a.Continuity Test. Perform the continuity test to each loop detector circuit at the following locations: − The continuity of the lead-in cable must be less than 0.5 ohms at the pull box before splicing; or − The continuity of the lead-in cable must be between 0.5 and 5.0 ohms at the traffic signal controller cabinet or detector cabinet after splicing in the pull box.
b.Inductance Test. Perform the inductance test to each loop detector and lead-in cable at the traffic signal controller cabinet or detector cabinet. The inductance must be between 50 to 500 microhenries.
c.Insulation Resistance Test. Perform the insulation resistance test using 500 volts direct current at the traffic signal controller cabinet or at the detector cabinet between one loop detector lead-in conductor and the cabinet ground rod. The insulation resistance must be greater than 100 megaohms.
7.Saw Cut Seal. Install sealer according to the manufacturer’s instructions. Pour the sealer into the slot to 1/2 depth without air bubbles or material pileup. Then fill the slots to roadway level without air bubbles or material pileup. Do not form a trough or a mound with sealer. Allow sufficient time for the sealer to harden according to the manufacturer’s recommendations, before allowing traffic to move over the area.
8.Final Testing. After installing sealer, perform the tests specified in Section 772.04 E.6, “Initial Testing” . Record the test results on SFN 60844 Traffic Signal Loop Detector Test Report and submit the form to the Engineer.
9.Loop Detector System. Ensure the loop detector system is moisture-proof.
a.Loop and Lead-In Conductor. Install the loop lead-in conductor unspliced from the pull box to the cabinet. Place the splice area at the top of the conductor holding device. Use a wood lath or other nonmetallic material to hold the loop and lead-in conductor in place inside the pull box, so that the conductor does not touch the bottom of the pull box.
b.Splices. If splic ing the detector feeder cable or loop lead-in conductor, use one of the following:
1.Uraseal;
2.3M Underground Splice Kit; or
3.Approved equal.
F.Feed Point. The local utility company will furnish and install the required single phase voltage service connection and any required meter.
G.Traffic Signal Standards and Combination Signal and Light Standards.
1.Use leveling nuts to plumb standards. Adjust the leveling nuts on assembled standards before 10:00 am.
2.Install and tighten the anchor bolts as specified in Section 754.04 D.5, “Overhead Sign Structures” .
3.Provide a rigidly -mounted terminal block in the base of each standard for the connection of control circuits. Install the luminaire fuses in the base of combination signal and light standards.
4.Provide rodent protection using wire mesh with a maximum size opening of 1/4 inch for all anchor base and transformer base installations. Place the wire mesh continuously ar ound the inside of the lower plate to prevent rodents from entering the base through the space between the concrete foundation and the lower plate. Secure the mesh to the anchor bolts and lower plate.
H.Traffic Signal and Pedestrian Heads.
1.General. Mount pedestrian signals vertically and within 2 inches of the pole. Provide back plates with a 1 inch yellow retroreflective sheeting border. Use sheeting specified in Section 894.02 E, “Type XI Retroreflective Sheeting” . Cover all heads with a material that allows the signal heads, when lighted, to be seen dimly by personnel testing the signals. Leave the hoods in place until the Engineer authorizes operation of the signal. The Engineer will determine when the installation is to be put into operation. Position the heads to provide the best possible view for the traffic to be controlled.
2.Pole Mounted. Attach the signal and head to signal poles using brackets that have threaded pole plates or pole clamps that accept the 1-1/2 inch standard steel pipe. Mount the traffic signal and pedestrian head on 1-1/2 inch standard steel pipe and fittings. Use pole plates that are held to the pole by means of banding material.
3.Pedestal Mounted. Mount pedestal -mounted traffic signals and pedestrian heads mounted on a post top slip fitter that attaches rigidly to the signal pole.
I.Traffic Signal Controller. Connect the signal, interconnect, detector, power, and other circuits to the terminals as shown on the manufacturer’s wiring diagram. When setting the cabinets directly on concrete foundation, set them on a sealant and seal with caulking inside and outside of the concrete base. Arrange the field leads in an orderly arrangement of wires in the cabinet. Do not cut field leads shorter than the furthest terminal for the same function in the cabinet.
J.Emergency Vehicle Pre-Emption (EVP). Install EVP equipment when specified in the contract. Program the time settings established by the local muni cipality.
K.Uninterruptible Power Supply (UPS). Install UPS equipment when specified in the contract. Equip the traffic signal controller with an “on-line” type UPS that provides power in both normal and backup mode. The UPS shall incorporate full power management and diagnostic function, and provide backup power to the system for a minimum of: − 2 hours in full signalized mode; and − 8 hours in flash operation. The UPS shall have auxiliary contacts to put the system into flash operation.
L.Remove Existing Equipment.
1.General. Before work begins, contact the local utility company and arrange a time for the power to be disconnected. The local utility will remove the meter. Remove the existing foundations to a minimum depth of 3 feet below the ground line and the surface restored to match adjacent areas.
2.Removal of Signal Heads. If no new signal heads are to be installed, disconnect the circuits at the controller terminal strip. Tape the wires together and place them in the bottom of the controller cabinet.
3.Remove Flashing Beacon System. After the local utility removes the meter, disconnect and remove the flashing beacon system.
4.Remove Traffic Signal System. Disconnect and remove conductor, controller cabinet, and standard. Remove the traffic signal heads, and mounting brackets from the standards. Remove the signal heads from the mounting brackets. Remove and dispose of the traffic control cable and concrete foundation.
5.Remove Traffic Signal Controller and Foundation. Disconnect and remove the controller cabinet. Remove and dispose of the concrete foundation
6.Remove Feed Point. After the local utility removes the meter, disconnect and remove switch box, meter trim, and conduit.
M.Tests and Acceptance.
1.General. Furnish all instruments and personnel required for testing and record test results. If a subcontractor performed electrical work, ensure the subcontractor is present during testing and inspection. 401 The Engineer will perform the initial and final i nspections when: − Winds are 30 mph or less; − Ambient temperature is 15°F or greater; and − It is not raining or snowing.
a.Malfunction Management Unit Test. Before uncovering the signal heads, perform a malfunction management unit test. Record the test resu lts on SFN 60836 Traffic Signal Malfunction Management Unit Test and submit the results to the Engineer.
b.Ground Test. Before opening to traffic, perform a ground test. The maximum allowable resi stance at the controller cabinet is 10 Ohms. The maximum allowable resistance at each traff ic signal standard is 25 Ohms. Record and submit the test results on SFN 60834, Traffic Signal Ground Test .
2.Initial Inspection. After the signal system is operational and open to traffic, submit a request to schedule the initial inspection. The system must be fully operational for a minimum of 15 days before the Engineer will perform the initial inspection. The Engineer will record the inspection results on form SFN 59867, Traffic Signal Inspection Checklist or SFN 60845 Flashing Beacon Inspection Checklist . Copies of completed forms will be sent to the Contractor.
3.Supplemental Inspections and Final Acceptance. After performing corrections, submit a request for a supplemental inspection. The Engineer will perform a supplemental inspection within 30 days of receiving the request. If this inspection discloses any unsatisfactory items, the Engineer will provide the Contractor with a written list of items that require correction. After correcting the items, request another supplemental inspection. If the Engineer determines that the work is complete, the signal system must operate for 14 consecutive days without interruption from defective equipment or improper workmanship. If the signal system fails within the 14 days, make necessary repairs. After repairs are complete, request another supplemental inspection. If the signal system operates for 14 consecutive days without interruption from defective equipment or improper workmanship, the Engineer will consider the last supplemental inspection as the final inspection and will accept the signal system.
772.05 Method of Measurement
The Engineer will measure items, completed and in place, as specified i n Section 109.01, “Measurement of Quantities” and as follows: The Engineer will measure each traffic signal system installed. A traffic signal system is comprised of the signal system at a single intersection.
772.06 Basis of Payment
Pay Item Pay Unit Traffic Signal System Each Remove Signal Heads Each Remove Flashing Beacon System Each Remove Traffic Signal System Each Remove Traffic Signal Controller Each Remove Feed Point Each Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 802 403 SECTION 802 PORTLAND CEMENT CONCRETE
802.01 Mix Design
A.General.
1.Development. Develop a mix design based on the requirements of this section. Perform the specified aggregate and strength tests and submit the results with the mix design. Submit the completed mix design a minimum of 14 days before beginning concrete placement operations. Use materials slated for use on the project when developing and testing the mix design. If any material or material source changes, develop and submit a revised mix design and test results. Provide concrete that is air entrained. Concrete is divided into classifications as shown in Table 802 -01. Table 802 -01 Concrete Class Designation Cementitious Material Content (lbs) per CY Water -Cement Ratio (Max) AAE 600 – 650 0.44 AE 550 – 600 0.47 ASE 575 – 625 0.40 A numeral following the alphabetical designation for the class of concrete indicates the gradation of coarse aggregate to be used in the mix, based on Table 802-03. If a specific gradation is not designated, use any gradation from Table 802-03. For ASE concrete, use aggregate that meets the requirements of Section 802.01 C.4, “Well Graded Aggregate” .
2.Class AE and AAE Mixes. Design a mix that will attain a compressive strength of 3,000 psi within 7 days or a flexural strength of 450 psi within 7 days. Mix designs used for Section 550, “Concrete Pavement” will be required to attain both a compressive strength of 3,000 psi and a flexural strength of 450 psi within 7 days. Measure compressive strength according to AASHTO T 22 and flexural strength according to AASHTO T 97. Aa correction factor of 0.92 when using 4 inch x 8 inch concrete cylinders.
3.Class ASE Mix. Design a mix that will attain a minimum compressive strength of 3,000 psi within 30 hours or a minimum flexural strength of 450 psi within 30 hours.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 428–437 of 550.