985 Page 573985 TRAFFIC SIGNALS AND ROADWAY LIGHTING
985.1REQUIREMENTS
Prior to fabrication, the Contractor will submit shop plans or catalog cuts for all signal equipment and luminaires to the Department for the Department’s opportunity for review. Any review by the Department of the shop plans or catalog cuts is limited to general conformance with the contract plans and specifications only. The Contractor will send an email with the shop plans or catalog cuts attached as a PDF to the Project Engineer and Office of Road Design. Upon request, the Project Engineer will provide the Contractor the appropriate email addresses. Within 14 calendar days of receiving the shop plans or catalog cuts, the Office of Road Design will respond to the Contractor in one of the following ways: 1) No Exceptions Noted; 2) Returned for Revision; or 3) Not Required for Review. If the Department’s response states, “Returned for Revision”, the Contractor must make the revisions and resubmit the shop plans or catalog cuts for review as specified above. The Contractor will not begin fabrication or construction of the work contained in the shop plans or catalog cuts until the Department has confirmed, in writing, a completed review with a response of “No Exceptions Noted” or “Not Required for Review”. A.Electrical Grounding and Bonding: 1.Grounding Wire: Grounding wire from electrical cabinets to the ground rod will be bare, soft drawn copper, size per NEC. Grounding wire from pole to ground rod will be bare, soft drawn copper, minimum size #6 AWG. 2.Bonding Conductors: Bonding conductors will be of the same size and insulation grade as the associated circuit conductors. Equipment grounding conductors will be sized in compliance with the NEC. 3.Ground Rods: Ground rods will be copper-coated electrodes in accordance with Underwriters Laboratory (UL). The size and length will conform to NEC requirements. B.Conduit: 1.Rigid Steel Conduit: Conduit and fittings will meet the requirements of UL 6 and 514 and will be hot dip galvanized. Each section of conduit will bear the UL label. 2.Rigid Nonmetallic Conduit: Conduit and fittings will be polyvinyl chloride heavy wall meeting the requirements of UL 651 and 514. Use and installation of polyvinyl chloride (PVC) schedule 40 and 80 will be in accordance with NEC and each section will bear the UL label. The Contractor will use schedule 80 nonmetallic conduit under all roadways and other locations as shown in the plans. 3.Innerduct Conduit: Innerduct conduit will be Schedule 40 HDPE. Innerduct conduit will provide 1 inch nominal duct size, be orange in color, and be longitudinally ribbed on the inside wall. C.Junction Boxes: Surface mounted junction boxes will comply with NEMA 4X stainless steel, will be UL-listed, and, at a minimum, will be sized according to the NEC. Stainless steel junction boxes will have the cover held in place with a continuous hinge and kept closed with screws and clamps on the remaining three sides. The cover will be removable by removing 985 Page 574the pin with the continuous hinge. All seams will be continuously welded. Gaskets will be closed cell neoprene. D.Concrete Footings: Concrete for footings will meet the requirements for Class M6 concrete. Cement will be Type II. Vertical reinforcement will be deformed unless otherwise noted and will conform to the requirements of ASTM A615/AASHTO M 31 Grade 60. Circular ties, stirrups, and spiral reinforcing may be fabricated from deformed bars conforming to the requirements of ASTM A615/AASHTO M 31 Grade 60. Spiral reinforcing may also be fabricated from cold drawn wire conforming to ASTM A1064 or hot rolled plain bars conforming to ASTM A615/AASHTO M 31 Grade 60. E.Bolts: All bolts, anchor bolts, anchor rods, nuts, and washers will conform to Section 972. F.Electrical Power Cables: Electrical cables will be Type THW, THWN, XLPE, or XHHW rated for 600 volts AC and be clearly and durably marked with the UL label, type of insulation, number of conductors, and the AWG size. Traffic signals and traffic signals with intersection lighting using the same service cabinet will utilize stranded copper meeting the requirements of ASTM B3 and B8, Class C. Roadway lighting will utilize stranded copper conductors for service, feeder, and branch circuits. 1.Direct Burial Cable : a.Cables will be made up of single or multiple conductors and will meet the applicable requirements of ICEA/NEMA Standards or applicable UL standards. b.When underground armored cable is specified, multiple conductor cable will be provided with bronze tape armor meeting the requirements of ASTM B130, with a minimum thickness of 10 mils and a spiral overlap of not less than 1/4 inch. c.The multiconductor cable will be either cross linked or butyl insulated. 2.Pole and Bracket Cable: a.The cable from pole base to luminaire will be two-conductor of the AWG size shown, meeting ICEA Standards. b.Conductors will be THWN/THHN meeting ASTM B3. Conductors will be stranded bare soft copper meeting ASTM B3 and B8, Class C. Each conductor will be insulated with high dielectric strength heat and moisture resistant PVC rated for use at 75ºC, and will meet the requirements of ICEA. One insulated conductor will be colored white and the other black. The two insulated conductors will be laid parallel and covered with a black polyethylene belt. The belt will meet the requirements of ICEA. G.Traffic Signal Control Cables: 1.Multiple Conductor Cables: Will be THHN/THWN insulated conductors with fillers of nonabsorbent material, bound with polyester tape and with a PVC jacket. Two-conductor cables may either be of round or flat construction. 985 Page 5752.Conductors: Will be Class C stranded copper meeting the requirements of ASTM B3 and B8. 3.Insulation: Insulation will have a minimum thickness of 19 mils of which 15 mils will be PVC with the remaining thickness of nylon. 4.Colors: Conductor insulation will be colored in accordance with ICEA. 5.Jackets: Jackets will be PVC meeting UL requirements for Class 12 jackets and ICEA standards. 6.Markings: The cable will be marked with the name of the manufacturer, rated voltage, UL label, AWG size, and number of conductors. H.Electrical Service Cabinet: 1.Will be a NEMA Type 3R enclosure. 2.Size will be as required to house required components. 3.Will be rated for service entrance equipment. 4.Required components: a.Main breaker. b.A copper bus rated for the voltage, current, and phases required by the plans. c.Branch circuit breakers meeting plan requirements for amps, voltage, and phases. Minimum A.I.C. will be 10,000. d.When plans require, a mechanically held contactor, NEMA rated for the load served, will be provided. The contactor will be encased in a UL approved weatherproof housing with an integral test switch included. The contactor will be complete with an interface relay for photocell control and photocell bypass switch. A photocell will be provided. I.Traffic Signal Poles: 1.Design: a.The location, number, area, and weight of the signal heads and signing as shown on the plan detail plates will be used for determination of adequate pole and footing structural design. The actual quantity and locations of signal heads will be as shown on the plan sheet. b.Design and fabrication will be in accordance with the current edition of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, including all subsequent interims and plan details. 985 Page 576c.Wind load will be calculated using the 50 year mean recurrent interval basic wind speed. d.New poles will be galvanized steel. Galvanizing will be in accordance with AASHTO M 111 (ASTM A123). Steel pole material will be in accordance with ASTM A36, A242, A570, A572, A607, A709, A1008, A1011, or A595 Grade A or B. A595 material will be limited to a 3/8 inch maximum thickness. Steel pole material with a thickness of 1/2 inch to 2 inches, will satisfy Charpy V-Notch toughness test requirements of 15 foot pounds at 40oF. The SDDOT Office of Bridge Design will be contacted for Charpy impact requirements for steel pole material thickness greater than 2 inches. e.The steel pole-to-base-plate connection will be a full-penetration groove-welded connection with a backing ring as described in the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. f.The design yield strength will be no higher than 55,000 psi. Strength of steel for fabricating poles may be higher than 55,000 psi, but not lower than 36,000 psi. g.Anchor bolt or rod circle, anchor bolt or rod size, and other structural properties of the pole and base are to be designed and determined by the pole manufacturer. h.Connections at the base of the pole will be made with water tight connectors approved for outdoor use. i.Pole designs must provide for drainage with no laps or edges to hold moisture. j.Mast arm pole shafts will have a removable cover and an opening for cable entrance to the mast arm. k.A "J" hook for a cable strain relief grip or other strain relief device will be provided at the top of the pole or electrical fixture. l.Luminaire extensions will meet specifications for roadway luminaire poles. m.Hand holes and other openings will be smooth, neat, and covered. 2.Certification: A statement is required, signed by a Professional Engineer registered in the state of South Dakota, certifying the pole designs meet all plan and specification requirements. 3.Shop Plans : Plans and design calculations for the traffic signal poles (including anchor bolts or anchor rods) will be prepared by a Professional Engineer registered in the State of South Dakota. Prior to fabrication, the Contractor will submit shop plans or catalog cuts and the design calculations for traffic signal poles to the Department for the Department’s opportunity for review. Any review by the Department of the shop plans or catalog cuts and the design calculations is limited to general conformance with the contract plans and specifications only. The Contractor will send an email with the shop plans or catalog cuts and design calculations attached as a PDF to the Project Engineer and Office of Road Design. Upon request, the Project Engineer will provide the Contractor the appropriate email addresses. Within 14 calendar days of receiving the shop plans or catalog cuts and 985 Page 577design calculations, the Office of Road Design will respond to the Contractor in one of the following ways: 1) No Exceptions Noted; 2) Returned for Revision; or 3) Not Required for Review. If the Department’s response states, “Returned for Revision”, the Contractor must make the revisions and resubmit the shop plans or catalog cuts and design calculations for review as specified above. The Contractor will not begin fabrication or construction of the work contained in the shop plans or catalog cuts until the Department has confirmed, in writing, a completed review with a response of “No Exceptions Noted” or “Not Required for Review”. J.Roadway Luminaire Poles: 1.Design: a.Design and fabrication will be in accordance with the current edition of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, including all subsequent interims and plan details. b.Wind load will be calculated using the 50 year mean recurrent interval basic wind speed. c.New poles will be galvanized steel. Galvanizing will be in accordance with AASHTO M 111 (ASTM A123). Steel pole material will be in accordance with ASTM A36, A242, A570, A572, A607, A709, A1008, A1011, or A595 Grade A or B. A595 material will be limited to a 3/8 inch maximum thickness. Steel pole material with a thickness of 1/2 inch to 2 inches, will satisfy Charpy V-Notch toughness test requirements of 15 foot pounds at 40oF. The SDDOT Office of Bridge Design will be contacted for Charpy impact requirements for steel pole material thickness greater than 2 inches. d.The steel pole-to-base-plate connection will be a full-penetration groove-welded connection with a backing ring as described in the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. e.The design yield strength for steel will be no higher than 55,000 psi. Yield strength of the steel used in fabricating poles may be higher than 55,000 psi but will not be lower than 36,000 psi. f.All poles will have breakaway transformer bases. g.Anchor bolt or rod circle, anchor bolt or rod size, and other structural properties of the pole and base are to be designed and determined by the pole manufacturer. h.Connections at the base of the pole will be made with water tight connectors approved for outdoor use. i.Pole designs must provide for drainage with no laps or edges to hold moisture. j.Mast arm pole shafts will have a removable cover and an opening for cable entrance to the mast arm. 985 Page 578k.A "J" hook for a cable strain relief grip or other strain relief device will be provided at the top of the pole or electrical fixture. l.Hand holes and other openings will be smooth, neat, and covered. 2.Certification: A statement is required, signed by a Professional Engineer registered in the state of South Dakota, certifying the pole designs meet all plan and specification requirements, including breakaway and structural adequacy, of the AASHTO Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. The physical testing procedures outlined in the Aluminum Association’s Specifications for Aluminum Structures may be used to establish service limits for structural adequacy certification of aluminum breakaway transformer bases and frangible couplings. If requested, test data of production samples to support the certification will be provided. 3.Shop Plans: Plans and design calculations for the roadway luminaire poles (including anchor bolts or anchor rods) will be prepared by a Professional Engineer registered in the State of South Dakota. Prior to fabrication, the Contractor will submit shop plans or catalog cuts and the design calculations for roadway luminaire poles to the Department for the Department’s opportunity for review. Any review by the Department of the shop plans or catalog cuts and the design calculations is limited to general conformance with the contract plans and specifications only. The Contractor will send an email with the shop plans or catalog cuts and design calculations attached as a PDF to the Project Engineer and Office of Road Design. Upon request, the Project Engineer will provide the Contractor the appropriate email addresses. Within 14 calendar days of receiving the shop plans or catalog cuts and design calculations, the Office of Road Design will respond to the Contractor in one of the following ways: 1) No Exceptions Noted; 2) Returned for Revision; or 3) Not Required for Review. If the Department’s response states, “Returned for Revision”, the Contractor must make the revisions and resubmit the shop plans or catalog cuts and design calculations for review as specified above. The Contractor will not begin fabrication or construction of the work contained in the shop plans or catalog cuts until the Department has confirmed, in writing, a completed review with a response of “No Exceptions Noted” or “Not Required for Review”. K.Luminaires: 1.Must be a complete lighting device, weatherproof, with cast aluminum housing, reflector, refractor, lamp, lamp socket, terminal block, integral ballast, and with internal parts readily accessible. 2.Mounting must be by a 2 inch slipfitter (except for wall mounts) unless otherwise noted in the plans. 3.Refractor will be constructed of clear, heat and shock resistant glass, or a material which gives similar light transmission with shock resistance. 4.Ballast will be constant wattage and multiple voltage. 985 Page 579L.Light Towers: 1.Design: a.Design and fabrication will be in accordance with the current edition of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, including all subsequent interims and plan details. Light towers, including anchor bolts or rods, will be designed for fatigue in accordance with Fatigue Importance Category I. b.Wind load will be calculated using the 50 year mean recurrent interval basic wind speed. c.New towers will be galvanized steel. Galvanizing will be in accordance with AASHTO M 111 (ASTM A123). Steel tower material will be in accordance with ASTM A36, A242, A572, A709, A1008, A1011, or A595 Grade A or B. A595 material will be limited to a 3/8 inch maximum thickness. Steel tower material with a thickness of 1/2 inch to 2 inches, will satisfy Charpy V- Notch toughness test requirements of 15 foot pounds at 40oF. The SDDOT Office of Bridge Design will be contacted for Charpy impact requirements for steel tower material thickness greater than 2 inches. d.The steel pole-to-base-plate connection will be a full-penetration groove-welded connection with a backing ring as described in the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. e.The design yield strength for steel will be no higher than 55,000 psi Yield strength of the steel used in fabricating poles may be higher than 55,000 psi but will not be lower than 36,000 psi. f.Anchor bolt or rod circle, anchor bolt or rod size, and other structural properties of the pole and base are to be designed and determined by the pole manufacturer. g.Connections at the base of the pole will be made with water tight connectors approved for outdoor use. h.Pole designs must provide for drainage with no laps or edges to hold moisture. i.Hand holes and other openings will be smooth, neat, and covered. 2.Lowering Devices: The manufacturer will furnish a factory representative to assist the Contractor with the assembly of the first lowering system into the pole assembly, and they will furnish the Contractor with written installation and operational instructions. a.Nonlatching Type: The lowering system will be a two-cable hoisting system consisting of a stainless steel head assembly, stainless steel luminaire ring and junction box, stainless steel winch drums and corrosion-resistant winching system, and a portable power unit. 985 Page 580The power cord will be Type W, with four #8 conductors and a 30 amp, 600 volt twist-lock weatherproof male connector. The power cable will be tethered between the hoisting cables with a stainless steel harness. The head assembly will be manufactured of stainless steel and will consist of a formed channel bolted to the top of the pole shaft with four stainless steel bolts, nuts, and lock washers. The channel will support four cable sheaves 6 inches in diameter with a special cable keeper to ensure proper cable guidance and two pilot guides to secure the horizontal position of the luminaire ring. The power cable sheave will be made of cast aluminum with a minimum diameter of 16 inches. All sheaves will have permanently lubricated bronze bearings and stainless steel axle pins. A cable keeper will be provided to prevent the power cable from working out of the sheave. The luminaire ring assembly will be fabricated of stainless steel and consist of the luminaire ring, hoisting cable terminator tubes, and a weather proof junction box. The inner portion of the ring will be equipped with a PVC shock absorbing tube protecting the pole and luminaires during the raising-lowering operation. The ring will be supplied with stainless steel tenons for the required number of luminaires. The power cord will terminate into the luminaire ring by a deluxe Kellems grip. The luminaire ring will be a totally enclosed wire way. The ring will be raised, supported, and lowered by two 1/4 inch stainless steel 7x19 strand cables, each with a hoisting strength of 6000 pounds. The two hoisting cables will be continuous from the luminaire ring to the winch drum and of sufficient length to be two times the length of the pole shaft plus 20 feet. The luminaire assembly will be held firmly to the masthead assembly by two compression springs at the end of the hoisting cables and within the stainless steel support cable terminal tubes. The springs will compress to hold the weight of the luminaire ring assembly and the luminaires plus 300 pounds. The winch assembly will consist of a worm gear speed reducer with a ratio of 72:1. The worm gear housing will be of cast aluminum or other corrosion resistant material. The assembly will also consist of a double output shaft and two stainless steel drums with calibrated adjustable clutches which compensate for the cable winding of both drums. The double output shaft will be supported by two stainless steel outboard bearing assemblies. The input or drive pulley will be equipped with a double brake shoe to serve as a safety brake when either the motor drive belt or the motor is removed. Raising speed of the luminaire ring will be a minimum of 12 feet per minute. The portable motor power unit will consist of a TEFC NEMA 56 C face motor, 240 volt reversible with a magnetic brake attached. It will be mounted to the winch with an internal bracket and a V-drive belt. The motor will be equipped with a power cord and a weatherproof connector to mate with the power supply cord connector. The motor will be operated by a push button control on a 20 foot long extension cord. Two stainless steel chains and grippers will secure the hoisting cables to the base of the pole while in the static load position. The ultimate support of the luminaire ring will not be dependent upon the winch assembly or have latches at the top of the pole or in the masthead assembly. 985 Page 581b.Latching Type: The lowering device will consist of a head frame assembly, a luminaire ring assembly, and a winch assembly. The luminaire ring will latch to the head frame assembly to eliminate strain on hoisting cables when the lowering device is not in operation. Latches will be of a cam-action type, with no moving parts or springs attached to the head frame assembly. The luminaire ring will not move laterally or rotate during the latching or unlatching process, imparting lateral g forces on the luminaire. The power cable will be guided over a roller assembly when lowering or raising the luminaire ring. The luminaire ring will employ roller contact, spring loaded centering arms to keep the ring concentric with the pole in winds up to 30 MPH. The arms will be interconnected and loaded with stainless steel springs to uniformly apply equal centering force when any one has been actuated. The winch assembly will be prewound with 1/4 inch diameter 7x19 stainless steel aircraft cord and will be supported at both ends. Keepers will be provided to ensure uncoiled cable will rewrap onto the drum. The portable power unit will be a heavy duty reversing type with a stalling torque at least twice that required to operate the device, and will be controlled by a reversing switch with a 20 foot cord. 3.Certification: A statement is required, signed by a Professional Engineer registered in the state of South Dakota, certifying the light tower designs meet all plan and specification requirements. 4.Shop Plans: Plans and design calculations for the light towers (including anchor bolts or anchor rods) will be prepared by a Professional Engineer registered in the State of South Dakota. Prior to fabrication, the Contractor will submit shop plans or catalog cuts and the design calculations for the light towers to the Department for the Department’s opportunity for review. Any review by the Department of the shop plans or catalog cuts and the design calculations is limited to general conformance with the contract plans and specifications only. The Contractor will send an email with the shop plans or catalog cuts and design calculations attached as a PDF to the Project Engineer and Office of Road Design. Upon request, the Project Engineer will provide the Contractor the appropriate email addresses. Within 14 calendar days of receiving the shop plans or catalog cuts and design calculations, the Office of Road Design will respond to the Contractor in one of the following ways: 1) No Exceptions Noted; 2) Returned for Revision; or 3) Not Required for Review. If the Department’s response states “Returned for Revision”, the Contractor must make the revisions and resubmit the shop plans or catalog cuts and design calculations for review as specified above. The Contractor will not begin fabrication or construction of the work contained in the shop plans or catalog cuts until the Department has confirmed, in writing, a completed review with a response of “No Exceptions Noted” or “Not Required for Review”. 985 Page 582M.Photoelectric Control Requirements: Photoelectric controls will be one of the photoelectric controls listed on the Department’s Approved Products List or an approved equal. N.Controller Cabinet : The controller cabinet will be NEMA compliant. 1.Cabinet Design: a.The cabinet will be made of welded sheet aluminum. b.The type and size of cabinets will be determined by the signal controller supplier. The cabinet will be of sufficient size to accommodate the controller and associated equipment. c.The cabinet will be furnished with a hinged door that provides complete access to the cabinet interior. The controller cabinet door will be hinged on the right side. The door will have a gasket making a weatherproof and dust tight seal. The door will be provided with a lock and two standard keys. Base mounted cabinets will be furnished with doorstops to hold the door open during servicing. d.The cabinet door will contain a police panel with a lock and key. The police panel will contain two switches. One switch will be designated "flash/normal" and the other switch designated "signal off/on". At any switch position, power will be maintained for all control equipment, including detector amplifier units, within the cabinet. The switch will be labeled and rated for the current load. Switch terminals on the rear of the police panel will be insulated so live parts are not exposed. e.The controller cabinet will be a NEMA Type 3R Enclosure. f.Underside mounted LED light strips will be installed on each shelf in the controller cabinet. An on/off switch that is turned on when the cabinet door is opened and turned off when the cabinet door is closed will activate the lights. The switch will be wired to place an input to the signal controller event or alarm log when the cabinet door is opened. The power supply for the LED light strips will be separate from the standard double plug receptacle. g.The controller cabinets will be capable of placing vehicle and pedestrian calls into the controller. Placed calls will provide for eight vehicle phases and four pedestrian phases. The placed calls for vehicle phases will be capable of extending the associated vehicle phase by continuous or intermittent contact. 2.Fan Assembly: Cabinets will be provided with thermostatically controlled fan vent assemblies. The thermostat will be adjustable within a range from 75ºF to 150ºF and will be separately fused. A screened and filtered air intake area of at least 12 square inches will be provided. The filters will be removable, cleanable, reusable, and replaceable. 3.Electrical: a.A three wire 15 ampere NEMA standard double plug receptacle with ground contact will be wired as a separate circuit ahead of the main breaker. 985 Page 583b.A main circuit breaker will be furnished and installed in the controller cabinet. An auxiliary circuit breaker will be provided and connected to the load side of the main breaker. The main breaker will be wired to protect the signal load and controller circuits. The auxiliary circuit breaker will be properly rated and fused to protect circuits utilizing unfiltered AC power. Terminal facilities in the cabinet for incoming AC power will be protected to prevent short- circuiting when working with tools in the cabinet. The circuit breakers will be capable of manual operation with markings to indicate ratings and whether it is in the open or closed position. c.A power line filter certified in accordance with UL Standard 1283 and meeting the following specifications will be installed at the main breaker: 1)50 db minimum attenuation over a frequency range of 200 kilohertz to 75 kilohertz. 2)Minimum feed through current of 30 amperes at 120 volts, 60 hertz. d.The cabinet will be equipped with a surge protection device certified in accordance with UL Standard 1449 and meeting the following specifications: 1)Nominal discharge current rating of 3kA. 2)Voltage protection rating 330V. e.Bus bar terminals such as AC common (neutral), AC power, safety (chassis) ground and AC signal power will be furnished and properly installed. f.Terminals and panel wiring for detector leads, interconnect, time switches, relays, load switch sockets, flash transfer relay sockets, and any other components required to provide the controller operation will be installed. g.Terminals and components that make up the basic terminal facilities will be permanently identified in accordance with the cabinet wiring diagram. Identification will be permanently attached as close as possible to the terminal or component and will not be affixed to any part which is easily removed. h.Each input or output terminated on a terminal block will be identified on the front of the panel by a position number and functional terminology (e.g. 0/1 Red, 0/2 Hold, Channel 3 Red, etc.). The same identification will be used consistently on the cabinet wiring diagram. i.Each component will be identified on the front of the panel by a symbol and function terminology consistent with the cabinet wiring diagram. Provisions will be made that each load switch socket can be identified by the phase or overlap number by writing on the panel in an area established for this feature. j.Panel wiring will be neat and firm with panel mounted terminals for signal lamp circuit conductors, one for each signal circuit, and one or more terminals for the common conductor. The terminals will be located a minimum of 3 inches from the bottom of the cabinet and arranged for adequate clearance between the terminals. The controller 985 Page 584equipment and terminals will be arranged within the cabinet so they will not upset the entrance, training, and connection of incoming conductors. k.A flasher socket and a solid state flasher meeting current NEMA standards will be provided in the controller cabinet. O.Controller: The controller will be a solid state, digital, NEMA TS2 Type 1 from the Department’s Approved Products List and as approved by the South Dakota Department of Transportation Traffic Design Engineer in the Office of Road Design. The controller will have front panel access to display cycle length, offset, and internal timing values. Access to these timing functions will be by keyboard entry as an integral part of the controller. The controller will meet NEMA environmental and electrical performance standards. The controller will also have a USB port and an Ethernet port. The controller will be two through twelve phase controllers. Digital timing will be provided with a battery backup. The controller will be capable of programming by manual entry via the front panel keyboard, data downloading from a portable PC computer via null-modem cable, data downloading from one controller to another using a serial port on each controller, and restoring data using a data transfer module (data key). In a closed-loop system, the controller will be capable of data downloading via telemetry. In an enterprise system, the controller will be capable of data downloading from a central server. The controllers will be capable of operating coordinated by time-based, hardwire, and telemetry. The controllers will have a copy function to copy all timing data from one phase to another. The controllers will also permit copying all coordination pattern data from one pattern to another. Hardware for future pedestrian signals will be provided when shown. The controller will be equipped with solid state signal load switching devices meeting current NEMA requirements. Load switches will be furnished with input and output indicator lights on the front panel. The interface panels will be capable of inserting up to sixteen load switches. Each controller will be furnished with a malfunction management unit (MMU) conforming to the requirements of NEMA Standard TS-2 Section 4. The provided MMU will have visual displays for programming and operational purposes. A sufficient quantity of BUS Interface Units will be installed in the cabinet to provide communication between detectors, load switches, controller unit, etc. Each BUS Interface Unit will conform to NEMA Standard TS-2, Section 8. The controller will be furnished with extra feature wiring to provide for remote flashing and each wire will have its own terminal connection. The flash control circuit will ensure that remote 985 Page 585transfer to flashing from normal stop and go operations occurs during the end of the mainline green interval in the cycle. When the controller is in a flashing condition, the signal switching mechanism will be inoperative. The controller time of day flash will alternate the red and yellow indication with yellow on the major route and red on the minor route. The controller malfunction flash will be red-red. Load switches for pedestrian indications will be required when pedestrian indications are shown. The cabinet wiring, load switch sockets, and connection facilities will be included for pedestrian movements permissible with phasing shown. The controller will have internal signal dimming. The controller solid state flasher will have dimming capability. Initial signal activation will be done by a manufacturer trained technician. The technician will be on- site for at least two consecutive days. The controller furnished will meet current NTCIP requirements. P.Detector Unit: Components and workmanship will conform to the standards of NEMA. Detector units will include a visual display screen in the controller cabinet. Q.Detector Loops: 1.Lead-in (Home Run) Wires: Feeder wires from loop leads to detector units will be twisted shielded pairs conforming to International Municipal Signal Association (IMSA) 50-2, #16 AWG minimum size. Splices are to be avoided in feeder wires. 2.Sawed-in Loops: a.Conductors will conform to the following requirements: Material Stranded Copper Size #16 AWG (Minimum) Insulation XHHW, THHN, RHH, or RHW Encasement 1/4 inch Polyethylene tubing b.Backer rod material will be resilient, nonabsorbent material approximately 25% larger in diameter than the width of the sawed slot to be sealed. c.Loop sealants will be one of the products listed on the Department’s Approved Products List or an approved equal. 985 Page 5863.Preformed Loops: Conductors will conform to the following requirements: Material Stranded Copper Size #16 AWG (minimum) Insulation 600 Volt, XLP, bearing the U.L. designation for either Type RHH and RHW or Type XHHW R.Signal Heads: 1.All vehicle and pedestrian signal indications will be light emitting diode (LED) signal modules. 2.Vehicular signal indications will meet the requirements of the Institute of Transportation Engineers (ITE) Standard, Vehicle Traffic Control Signal Heads. 3.Pedestrian signal indications will meet the requirements of the ITE Standard, Pedestrian Traffic Control Signal Indicators. 4.The light intensity requirements of the ITE standard will not apply to vehicular and pedestrian signal indications for solar powered signal systems and the intensity will be as approved by the Engineer or as specified in the plans. 5.The LED signal modules will be warranted against defects in materials and workmanship for a period of 36 months after the installation of the modules. The manufacturer will provide this warranty in writing to the Engineer prior to installation of the LED signal modules. 6.Size: Will be a minimum of 12 inches diameter. 7.Color: Doors, visors, and backplates will be dull black and housing highway yellow. 8.Material may be either cast aluminum or polycarbonate resin. 9.Visors will be of the tunnel type. 10.Backplates for Signal Heads: Signal backplates will be 0.06 inch thick aluminum, 0.08 inch thick aluminum composite, or 0.1 inch thick polycarbonate. Polycarbonate backplates will consist of no more than two pieces. Signal heads will have backplates with retroreflective border. The vehicle signal head backplates will have a factory applied 3-inch wide yellow retroreflective border. Sheeting for the border will be Type XI or Type IX in conformance with ASTM D4956. Signal backplates will extend not less than 5 inches from the edge of the signal head at the top, bottom, and sides. The bottom of the backplate on vehicle signal faces mounted directly above pedestrian signal indications will be sized to permit the separate adjustment of the vehicle and pedestrian signal indication and may be less than 4 inches. 985 Page 587S.Pedestrian Push Button: All pedestrian push buttons will be compliant with the Americans with Disabilities Act (ADA). Accessible pedestrian push buttons will be one of the accessible pedestrian signals on the Department’s Approved Products List.
a.Will be pressure activated with essentially no moving parts. b.Will be vandal resistant. c.Will activate with 3 pounds force or less. d.Will have an LED that illuminates when the button is being pushed and remains illuminated until the pedestrian call is served. e.Will give a toned beep verification of button being pushed. f.Will have an operating life of 1 million actuations. g.Will be compatible with NEMA TS2 controllers. 2.Housing: a.Button housing will be unfinished, high impact cast or machined aluminum. b.All switch electronics will be sealed within the high impact cast or machined aluminum housing. c.Will have a gasket between the button housing and the mounting cup. 3.Electrical: a.Operating Voltage: 15 to 24V DC or 12 to 24V AC. b.On Resistance 10 Ohms (when the button is activated and placing a call). c.Standby Current 10 micro amps typical. d.Will have built in surge protection. e.Will have a solid state electronic piezo switch rated for 1 million cycles with no moving plunger or moving electrical contacts. f.Will hold the call for a minimum of 5 seconds. g.Requires only two conductors be run from the traffic signal cabinet to the push button to operate. 985 Page 588h.Six units wired in parallel on a single pedestrian isolator input will not pull the input voltage of the pedestrian isolator down such that a false pedestrian call is placed in the controller. T.Flashing Beacons: Flashing beacons will conform to Part 4 of the MUTCD and the following: 1.Each signal indication will have a visible diameter of not less than 12 inches. 2.All signal indications will be LED type. The LED module will be in accordance with the requirements of the current performance specifications of the ITE. 3.When solar powered flashing beacons are specified in the plans, the solar powered flashing beacons will be one of the products as listed on the Department’s Approved Products List or approved by the Engineer. 990 Page 589990 PIPE CULVERTS AND DRAINAGE TUBING
990.1REQUIREMENTS
A.Reinforced Concrete Pipe: Reinforced concrete pipe will conform to AASHTO M 170, M 206, and M 207. 1.Basis of Acceptance: The acceptability of the pipe will be determined on the basis of plant load bearing tests, compressive strength of concrete, material tests, and inspection of the complete product. 2.Materials : Materials will conform to the requirement of the following sections: a.Portland cement will be Type II conforming to Section 750. b.Water will conform to Section 790. c.Fine aggregate will conform to Section 800. d.Coarse aggregate will conform to Section 820 except the gradation requirements will not apply. e.Reinforcement will conform to Section 1010 . f.Air entraining agent will conform to Section 751. The entrained air content for wet cast pipe will be 6% plus or minus 1.5%. g.Fly ash will conform to Section 753. h.Flexible watertight gaskets will conform to ASTM C1619 or ASTM C1628. i.Admixtures will conform to Section 752. 3.Concrete: The concrete in special sections will have a minimum compressive strength of 4000 psi. Special sections are those sections of concrete pipe not covered by the class requirement of AASHTO M 170, M 206, or M 207. The strength will be determined by test cylinders or by cores. B.Corrugated Metal Pipe: Corrugated metal pipe will conform to AASHTO M 36 or AASHTO M 196. C.Bituminous Coated Corrugated Metal Pipe: Bituminous coated corrugated metal pipe will conform to AASHTO M 190, except the pipe will conform to AASHTO M 36 or AASHTO M 196 before coating. D.Structural Plate Pipe: Structural plate for pipe will conform to AASHTO M 167 or AASHTO M 219.