529 ALASKA 2020 SECTION 740 SIGNALS AND LIGHTING MATERIALS
740-2.01 GENERAL. Use electrical materials, devices, fittings, and hardware that conform to
applicable NEMA and ANSI standards. Use electrical products that are Third Party Labeled or Listed (by a State of Alaska- approved independent electrical testing laboratory such as UL, ETL, CSA, etc.), unless otherwise indicated on the Materials Certification List (MCL). Ensure that all material and workmanship, as determined by the Department , conform to the standards of the NEC, the NESC, and local safety codes as adopted and amended by the authority having jurisdiction.
740-2.02 Signal and Lighting Structures.
1.Design. Design structures for highway lighting and traffic signals to conform to the 2013 AASHTO Standard Specifications for Structural Supports of Highway Signs, Luminaires, and Traffic Signals, including September 2013 errata and 2015 Interim Revisions. All working drawings and calculations must be stamped with the seal of, dated b y, and signed by a Professional Engineer registered in the State of Alaska. Submit the working drawings and calculations for each pole to the Engineer for approval. Design for all stresses on the completed structure with all hardware in place. Show the des ign wind loads, projected areas, wind drag coefficients, material properties, and other design information on the working drawings. Include a summary of the loads used in each pole’s design. Design each electrolier to include a traffic sign, 48 inches by 4 8 inches, located with its centroid 14 feet above the base of the pole. Determine the shaft lengths and mast arm connector plate locations of all poles to meet the plan mounting heights of luminaires and traffic heads. Design signal mast arms so that no signal heads or signs will be mounted within 12 inches either side of a mast arm extension splice. Design all poles and mast arms with a round or 16-sided cross section, except high tower poles may also be 12- sided cross section.
2.Fabrication. Fabricate a ll posts, poles, and mast arms from tapered steel tubes. Fabricate tubes with walls up to ½ -inch thick from the pre- qualified base metals listed in AWS D1.1 and which feature maximum yield strengths of 70,000- psi. Fabricate all elements greater than ½ - inch thick from steel that conforms to ASTM A709 and meets the Fracture Critical Impact Test requirements for zone 3. Fabricate 10 feet long signal posts from sheet steel that features a minimum thickness of 11 US Standard Gage. Fabricate each post with a m inimum inside diameter of five inches at the base plate. Use a three and one- half inch long piece of 4- inch schedule 40 pipe that conforms to ASTM A53 Grade B as a post -top adapter. Fabricate poles from full length sheets or shorter sections. Fabricate each section from not more than 2 pieces of sheet steel. When using 2 pieces, place the longitudinal welded seams directly opposite one another. Place the welded seams on adjacent sections to form continuous straight seams from the base to the top of the pol e. The Department will not accept poles and mast arms made with laminated steel elements. Steel selection shall be according to ASTM A385 for silicon content. Hot dip galvanize all pole segments and attachments to meet AASHTO M 111 and these specifications . Completely submerge pole segments in one dip in a kettle of concentrated 530 ALASKA 2020 zinc ammonium chloride flux solution heated to 130°F, then completely submerge in one dip in a separate kettle of prime western grade zinc heated to approximately 825°F. Galvanize a ll bolts and fasteners to meet AASHTO M 232. Poles must be straight, with sweep not exceeding 3/4 inch throughout the length of the pole. Do not put holes in the pole segments unless shown on the design drawings and provided for in the engineering calcu lations. Fabricate pile cap adapters from grade X42 steel line pipe that conforms to API 5L and from steel plate that conforms to ASTM A709 Grade 50. Attach the anchor plate to the pile section with a complete joint penetration (CJP) weld. Fabricate the anchor plate to match the base plate of the lighting standard.
3.Mill Certification. Submit the mill certification for all steel items (piles, plates, bolts, and all other related items) to the Engineer for approval.
4.Welding. Perform all welding to conform to Subsection 504- 3.01, Item 7. Welding and the following:
a.Make all welds continuous. Grind all exposed welds flush with the base metal, except fillet welds and seam welds on top of mast arms. Grinding the seam welds on 16- sided poles is not required.
b.Use co mplete Joint Penetration (CJP) groove welds for all circumferential welds. Only one-time repair of circumferential welds is allowed without written permission of the Engineer.
c.Use CJP groove welds on longitudinal seams within 6 inches of CJP circumferential welds. Use partial joint penetration (PJP) longitudinal seam welds in all other seam weld locations. PJP welds must provide at least 60 percent penetration.
d.Welded support to base plate connections must be either (1) CJP groove welds or (2) socket -type joints with two fillet welds. When CJP groove welds are used, additional fillet welds may be used when deemed necessary by the designer.
e.Inspect 100 percent of CJP welds by either radiography (RT) or ultrasound (UT). Inspect a random 25 percent of all fil let and PJP welds by magnetic particle (MT). If a defect is found, inspect 100 percent of all fillet and PJP welds made to fill the order. Show NDE symbols on the plans.
5.Miscellaneous. Neatly round all exposed corners of the plates that make up the base assembly to a 1/8- inch radius and finish smooth all exposed edges. Provide shafts with slip- fitter shaft caps. Orient hand holes to face down- stream of the traffic flow. Furnish anchor bolts and nuts required for relocating existing poles. Identify critical information for all poles and arms with visible permanent aluminum tags that contain the information shown in Table 740- 1. The measurements shown are for illustration purposes only. The tags must be 1- 1/2 inches by 3 inches for a 1- line message and 1- 1/2 x 4 inches for a 2- line message. The letter size must be 1/4 inch high and the spacing between the edge of the tag and text and between text must be 3/8 inch. Secure the tags with two 1/8- inch blind rivets at the base of poles and the underneath side of mas t arms. If a signal mast arm extension is required, mark it with a tag with the same message as the signal mast arm. 531 ALASKA 2020 TABLE 740 -1 POLE MARKINGS
740-2.03 WOOD POLES. Use wood poles for service or temporary installations of the class
shown on the Plans or as specified in the Special Provisions. Use 35- foot poles, except for service poles use 25- foot poles. Use mastarms and tie rods for wood pole installations that conform to Subsection 740- 2.02, and to the details shown on the Plans. Provide each mastarm with an insulated wire inlet and wood pole- mounting bracket for mastarm and tie rod crossarm. Use structural timber meeting Section 713. Do not use poles that have more than 180 degrees twist in grain over the full length. Ensure that the sweep is no more than 4 inches. Pressure- treat wood poles, that are not to be painted, after fabrication. Meet Sec tion 714.
740-2.04 High Tower Poles.
1.Design high tower poles in conformance with Subsection 740- 2.02 and the following:
a.Design for the basic wind speed shown in Standard Specifications for Structural Supports or for 100 miles per hour, whichever is great er.
b.Design all poles for a 50- year design life.
c.Use a gust effect factor of 1.14.
d.Design all poles using fatigue category I importance factors.
e.Design all poles that taper less than 0.0117 ft/ft for vortex shedding. MEASUREMENTS TAG MARKINGS Signal Poles
a.Signal mast arm length 40.7 ft./ 30.5 ft. SMA 407/ SMA 305
b.Luminai re mast arm length 15.1 ft./ 15.1 ft. LMA 151/ LMA 151
c.Pole height 37.4 ft. PH 374
d.Intersection number (if more than one) - pole number 1 - P 4
e.Sum of signal mast arm moments about centerline of signal pole SM 4000/ SM 3200
f.Design wind speed 100 mph DWS 100 Light Poles
a.Luminaire mast arm length 15.1 ft./ 15.1 ft. LMA 151/ LMA 151
b.Pole height 37.4 ft. PH 374 Signal Mast Arm
a.Mast arm length 40.7 ft. SMA 407
b.Intersection number (if more than one) - pole number 1 - P 4
c.Sum of s ignal mast arm moments about centerline of signal pole SM 3740
d.Design wind speed 100 mph DWS 100 Luminaire Mast Arm
a.Mast arm length 18.0 ft. LMA 180
b.Pole number (if unique arm design) P 4 Note : Italic type indicates additional Tag Markings if poles have 2 luminaire or 2 signal mast arms. 532 ALASKA 2020 f. Design all poles to support a load that consists of the lowering device and ten luminaires equipped with light shields. Use the following values for these components. Component Effective Projected Area Weight One lowering device 8.6 ft2 309 lbs Ten luminaires 21.5 ft2 617 lbs Ten light shi elds 30.0 ft2 22 lbs
g.Use tapered tube sections that telescope into each other. Provide the pole segment lengths on the plans. Design all poles for no more than four sections. Provide for a telescoping slip joint with a minimum overlap length of 24 inches or 1.5 times the diameter of the female section, whichever is larger.
h.Provide a reinforced rectangular hand hole that provides an opening large enough to install the winch assembly.
i.Provide a detachable door over the hand hole frame including hinges, nuts to fasten the door to the frame, and a neoprene gasket to provide a watertight seal around the frame. Provide for a locking mechanism for the hand hole door.
j.Use anchor bolts that conform to ASTM F1554, Grade 55 with Supplemental Impact Test Requirements of Section S4. The distance from bottom of the leveling nut to the top of the concrete of the anchor bolts may not exceed 1 inch.
k.Provide connection details for the installation of the light lowering device and associated hardware.
l.Furnish poles that allow the luminaire- lowering device to come within five feet of the base plate.
2.Fabricate the high tower poles as follows:
a.Mark all sections of the shaft to facilitate field assembly.
b.Fabricate poles segments so that no field welding is required.
c.Fabricate each tapered section from one piece of steel.
d.Provide CJP longitudinal seam welds in the ends of those sections that form a joint. Make the CJP longitudinal seam weld at least 12 inches longer than the length of the telescoping slip joint.
e.Fabricate the base f lange from steel that meets the requirements of ASTM A709.
740-2.05 CONDUCTORS. Use conductor sizes based on the American Wire Gage (AWG). Use
sizes that conform to the Plans or, when not shown, to this subsection. Use insulated conductors made of uncoat ed, stranded copper that conforms to the specifications of ASTM B8. Use grounding conductors that are bare or insulated copper of the gage required by the NEC. They may be stranded, solid, or braided. Provide the following markings on the outer coverings of conductors and cables on intervals of 2 feet or less: manufacturer, the number of conductors or pairs in cables, conductor size, 600V, the conductor or cable type and environmental conditions for which the conductor or cables are listed, and the symbol of an approved independent testing laboratory. Use conductors meeting the referenced specifications for the following purposes: 533 ALASKA 2020 1. Power Conductors . For individual conductors, install general -purpose building wire manufactured according to UL Standard 44, and NEMA No. WC7. Furnish conductors insulated with cross -linked polyethylene listed as type XHHW -2 and rated for 600 volts AC operation. TABLE 740 -2 CONDUCTOR TERMINATIO N TABLE CONDUCTORS PER CABLE CIRCUIT WIRE COLOR AWG. NO. BAND LEGEND 5 Vehicle Red Vehic le Yellow Vehicle Green Common Neutral Spare Red Orange Green White Black 14 Head No. 7 Vehicle Red Arrow Vehicle Yellow Arrow Vehicle Green Arrow Common Neutral Spare Spare Spare Red Orange Green White White/Black Black Blue 14 Head No. 7 Vehicle Red Vehicle Yellow Vehicle Green Common Neutral Spare Vehicle Yellow Arrow Vehicle Green Arrow Red Orange Green White White/Black Black Blue 14 Head No. (s) 5 Pedestrian Don’t Walk Pedestrian Walk Common Neutral Spare Spare Red Green White Orange Black 14 Head No. 5 Photo Electric Control Load to Contactor Neutral Spare Spare Black Red White Orange Green 14 PEC Pedestrian Pushbutton Neutral Black White 14 Head No. Located Under 2 Flashing Beacon Neutral Black White 14 Head No. 2 Preemption Neutral Black White 14 “PRE” 3 Highway Luminaire Highway Luminaire Highway Luminaire Spare Black Red White 8 or 6 Circuit No. Circuit No. 3 Service to Controller Neutral Spare Black White Red 6 “SIG” No Band No Band 3 Sign Luminaire Sign Luminaire Sign Spare Black Red White 8 SIGN SIGN 534 ALASKA 2020 Use size 10 AWG wire for illumination tap conductors. In an electrolier, the illumination tap conductors run from the fused disconnect kit to the ballast in the luminaire. Furnish conductors with black, red, or white colored insulati on as required to identify the two phase and neutral conductors, respectively. If conductors in controller cabinets carry the full signal load circuit, use size 10 AWG or larger conductors. Use orange colored conductors from the flash transfer relay to program emergency flashing operation.
2.Illumination Cables . For cables that consist of three size 6 or 8 AWG conductors, furnish power cables that feature three conductors, each insulated with cross -linked polyethylene, and a black, low density, high molecular weight polyethylene jacket. Use insulated conductors listed as type XHHW -2. Furnish these cables with one black, one white, and one red colored conductor and no grounding conductor. Use cables rated for 600 volts AC operation. Use insulated conductors meeting UL Standard 44. The jacket must also meet ANSI/NEMA WC 70.
3.Power Cables . For cables that consist of three size 4 AWG or larger conductors, furnish tray cables that feature three conductors, each insulated with cross -linked polyethylene that meets the requirements of XHHW -2, and a PVC jacket. Furnish these cables without an integral grounding conductor. Use cables manufactured according to UL Standard 1277, ICEA S- 95-658, and ANSI/NEMA WC 70. Provide cables listed for direct burial and resistance to sunlight and rated for 600 volts AC operation. Furnish these cables with black conductor insulation with one printed number (1, 2, or 3) identifying each conductor.
4.Control Cables . Wire with signal cable meeting IMSA 20- 1 all vehicular signal heads, pedest rian signal heads, pedestrian push button detectors, flashing beacons, hardwired local coordination and preemption devices, and photoelectric controls.
5.Detector Loops . Use No. 12 AWG conductors for detector inductive loops that meet IMSA Specification 51- 3, Type RHW/USE, or IMSA Specification 51- 5, when called for on the Plans or specified in the Special Provisions.
6.Loop Lead- In Cables . Unless otherwise specified, use a tray cable that conforms to the following specifications to connect the loop detectors t o the terminal blocks in the controller cabinet. Furnish this cable, also known as Snyder Cable; manufactured according to UL Standard 1277. Supply these cables third party certified as Type TC and certified for use in underground conduit or as an aerial c able supported by a messenger, and rated for 600 volts AC operation. Use size 18 AWG, 16 strand, tinned copper conductors per ASTM B33 insulated with wet - rated, cross -linked polyethylene similar to XHHW. Furnish conductors with insulation colors that match Table 660- 1 twisted into pairs. Provide each twisted pair with an overall aluminum foil coated mylar shield that provides 100 percent coverage and a 20 AWG tinned copper drain wire that is in constant contact with the foil side of the shield. Apply a tight fitting polyvinyl chloride jacket over the conductor assembly. Only use the following loop lead- in cable, also known as shielded data cable, to rewire existing traffic signals when specified. Use cables that consist of 6 twisted pairs that consist of str anded, size 18 AWG tinned copper wire and polyethylene or polypropylene insulation. Furnish each pair covered with an aluminum foil shield, stranded copper drain wire, and an 535 ALASKA 2020 overall PVC or PE jacket. Use cable rated for 300 volts and whose colored pairs m atch those specified in Table 660- 1.
7.Telemetry Cable. Use interconnect cable that consists of solid copper conductors of the number of pairs called for in the Plans meeting the requirements of Rural Utilities Service [formerly the Rural Electrification Adm inistration (REA)] specification PE -39 for filled telephone cables. The shield may be either copper or aluminum. TABLE 740 -3 INTERCONNECT TERMINA TION TABLE
740-2.06 Ele Ctrical Conduit.
1.Rigid Metallic Conduit. Use UL Standard UL- 6 galvanized conduit and fittings that are rigid metal type and manufactured of mild steel or wrought iron.
2.Rigid Nonmetallic Conduit. Use UL Standard UL- 651 Schedule 40 and 80 rigid polyvinyl chloride (PVC) conduit. Use PVC fittings meeting NEMA TC 3.
740-2.07 FUSED SPLIC E CONNECTORS. Use fused, quick disconnect, splice connector that is
weather tight and has two halves: a single- unit line side socket and a load- side plug. Use fuses TELEMETRY CABLE : Type PE -39, No. 19 or No. 22 AWG, Solid Copper, as noted on the Plans or in the Spe cial Provisions. PAIR No. COLOR PAIR No. COLOR PAIR No. COLOR 1 Blue White 9 Brown Red 17 Orange Yellow 2 Orange White 10 Gray Red 18 Green Yellow 3 Green White 11 Blue Black 19 Brown Yellow 4 Brown White 12 Orange Black 20 Gray Yellow 5 Gray White 13 Green Black 21 Blue Violet 6 Blue Red 14 Brown Black 22 Orange Violet 7 Orange Red 15 Gray Black 23 Green Violet 8 Green Red 16 Blue Yellow 24 Brown Gray 25 Gray Violet HARDWIRE CABLES : IMSA Type 20 -1, (2) 7 conductor No. 14 AWG Cable No. 1 Cable No. 2 Circuit Color Circuit Color Cycle 2 Green Offset 1 Green Cycle 3 Orange Offset 2 Orange Cycle 4 Red Offset 3 Red Free Blue Split 2 Blue Common White Common White Spare Black Spare Black Spare White/Black Spare White/Black 536 ALASKA 2020 that are 10 ampere, midget (13/32” x 1- 1/2“) ferrule type with a fast acting current limiting (KTK type) design.
740-2.08 SIGN SWITCH ES. Provide a NEMA 3R non- fused disconnect switch as shown on the
Plans for each sign illumination installation.
740-2.09 CONTROLLER ASSEMBLIES. Use solid -state, traffic controller assembly meeting the
requirements of NEMA Standard. TS 1, Traffic Control Systems , and designated sections of NEMA Standard TS 2, Traffic Controller Assemblies . Use non- incandescent indicators for all electronic devices covered under Subsections 740- 2.10 through 740- 2.13.
740-2.10 Controller Unit.
1.Actuated Controller Units . Actuated Controller Units must conform to the NEMA Standard TS 1, Traffic Control Systems , Section 13 Interface Standards for Advance Two- Phase through 8-Phase Solid- State Traffic Controller Units and Section 14, Definitions and Physical and Functional Standards for Advance Two- Phase through 8- Phase Solid- State Traffic Signal Controller Units of the Vehicle- Actuated Type, and the following modifications:
a.Use single ring 4 phase or dual ring 8 phase controller units as shown on the Plans.
b.Make dual ring controller units user -programmable for dual entry and single- entry operation.
c.TS 1 -1989, Traffic Control Systems , 14.3.7.2 Overlap Programming. In item 1, insert “providing the function is field programmable without the use of external tools or devices” after the word “manufacturer”.
740-2.11 CONTROLLER CABINET. Use a controller cabinet that meets the requirements of
NEMA Standard TS 2 -1992, Traffic Controller Assemblies , Section 7, Cabinets and NEMA Standard TS 1- 1989, Traffic Control Systems , Section 10, Terminals and Facilities. Apply 2 factory finishing coats of aluminum paint to the outside of the controller cabinets. Paint the interior surfaces of the controller cabinet with 2 factory finish coats of a suitable white exterior grade paint.
1.Standard Features . Supply the following standard features:
a.Cabinet Lock . Use a cabinet that has a main door equipped with a construction core lock. The lock must accept a Best CX series core that will be installed by the State after the contract is complete.
b.Cabinet Ventilation.
1.Furnish the fan and cabinet vent with internally mounted metal covers that are fabricated to close off the flow of air during winter operation.
2.Equip the cabinet with a selectable, 750/1500- watt cabinet heating device. The heating device must have a remote air -sensing thermostat. The contacts must be rated 20 amps, 120 volts. Construct the thermostat so that contacts close on descendi ng temperature and are adjustable between 0 and 30 °F ±5 °F. The contacts must open on rising temperatures of 15 °F above the closing temperature. The adjustment must have an indicating pointer. 537 ALASKA 2020 Connect the thermostat in series with an electrical resistanc e heater and blower fan. The blower fan must be rated for continuous duty. The heater and fan must be connected in parallel and rated 120 volts, 60 Hertz. Mount the unit in the horizontal position at a location beneath the lowest shelf. Do not block the air intake or outlet. Provide the unit with a SPST manual override switch that bypasses the thermostat to enable the fan and heater to operate at warmer temperatures.
c.Cabinet Wiring.
1.Neatly arrange the wiring within controller cabinets to conform to the requirements of Subsections 660- 3.05 and 740- 2.05. Wire and equip all controller cabinets to handle the full capacity of the controller and cabinet configuration (see NEMA TS 1, Traffic Control Systems , Section 10, Table
10-2 Wired Sockets) specified on the Plans or Special Provisions. Use configuration
4 for a 4- phase controller, and configuration 8 for an 8- phase controller. Equip the cabinet with all required control and auxiliary equipment connecting cables to operate the phases and detection indicated on the Plans, including future use. Size all wiring, switches, surge protectors, flash relays, flashers, etc., to handle the necessary amperage required under full cabinet use. Use orange colored wires to run from the flash transfer relay used for emergency flash programming.
2.Intersection flash operation must be programmable by rearranging interconnecting jumpers between the load switches, flash transfer relays, and field signal wire terminal blocks. Make these changes by moving the jumpers at the terminal bl ocks.
3.Field Terminal Blocks .
a.Provide 2 or more insulated terminal blocks to terminate field conductors. Provide each block with 12 poles with 10- 32 screw type terminals. Use a terminal block that is a barrier type with removable shorting bars in each of the 12 positions and with integral -type marking strips. Terminate all conductors to a terminal block.
b.Terminate conductors from the controller unit in ring- type terminal lugs or solder them to a through panel solder lug on the rear side of the terminal. Term inate all other conductors in spade- type terminal lugs.
c.Do not bring more than 3 conductors to any one terminal. Two flat metal jumpers, straight or U shaped, may also be placed under a terminal screw. Fully engage at least 2 full threads of all terminal s crews when the screw is tightened. Do not extend live parts beyond the barrier.
d.Terminate all interconnect cable conductors on individual terminals.
e.Include a 16- position neutral terminal bus bar on each side of the cabinet.
d.Cabinet Accessories . See NEMA Standard TS 2, Section 5 Terminals and Facilities, Figure 5.4.2- 1 Cabinet Power Distribution Schematic for items (1) through (5).
1.Disconnecting Means .
a.Main circuit breaker must be a single pole, 50 ampere, 10,000 amperes interrupting capacity (or higher rat ing, if specified on the drawings) for 8 phase 538 ALASKA 2020 cabinets or a single pole, 30 ampere, 10,000 amperes interrupting capacity (or higher rating, if specified on the drawings) for 4 phase cabinets.
b.Auxiliary circuit breaker(s) must be single pole, 20 ampere, 10,000 amperes interrupting capacity (or higher rating, if specified on the drawings) to protect fan, heater, light and convenience outlet(s). The rating of the main disconnect means with overcurrent protection must be not less than 125 percent of the maximu m anticipated continuous load. When using disconnecting means, use the “trip- indicating trip -free” type.
2.Signal Bus . Connect the signal bus to the incoming AC line through a signal bus mercury contactor and an overcurrent protection device. Energize the si gnal bus mercury contactor to provide power to the signal bus. The current rating of the signal bus mercury contactor must be at least the current rating of the main overcurrent protection device.
3.AC Service Transient Suppression. Connect the transient suppression device for the primary feed of the cabinet on the load side of the cabinet overcurrent protection device. The transient voltage suppression device connected to the controller power circuit must provide protection against voltage abnormalities of 1 cycle or less duration. The suppressor must be solid state high energy circuit containing no spark gap, gas tube, or crow bar component. The current rating of the device must be 15 amps minimum. The device must provide transient protection between neutral and ground, line and ground, as well as line and neutral. If the protection circuits fail, they must fail to an open circuit condition. The device must meet all requirements of UL standard 1449. The suppressed voltage rating must be 600 volts or less when subject to an impulse of 6,000 volt, 3,000 amp source impedance, 8.0/20 microsecond waveform as described in UL 1449. In addition, the device must withstand, without failure or permanent damage, one full cycle at 264 volts RMS. The device must contain cir cuitry to prevent self -induced regenerative ringing. There must be a failure warning indicator light which must illuminate when the device has failed and is no longer operable. The transient suppression device must withstand a 20,000 ampere surge current w ith a 8x20 microsecond (time to crest x time to second halfcrest) waveform 20 times at 3- minute intervals between surges without damage or degradation to the suppressor. Output voltage must not exceed 500 volts at any time during the test. Use a device that is a solid state, high- energy circuit with no spark gap, gas tube, or bar component.
4.Radio Interference Suppression. Equip each traffic cabinet, flasher, and other current interrupting device with a suitable radio interference suppressor installed at the input power point. Install the radio interference suppressor after the AC service transient suppression unit described in Subsection 740- 2.11.1.d.(3). It must provide a minimum attenuation of 50 decibels over a frequency range from 200 kilohertz to 75 megahertz, when used with normal installations. The interference suppressor must be hermetically sealed in a substantial metal case filled with suitable insulating compound. Terminals must be nickel -plated, 10- 24 brass studs of sufficient external length to provide space for connecting two No. 8 conductors and must be so mounted that the terminals cannot be turned in the case. Ungrounded terminals must be properly insulated from each other and must maintain a surface leakage distance of not less than 1/4 inch between any exposed current conductor and any other metallic part, with an insulation factor of 100 to 200 megohms dependent on external circuit conditions. The radio interference suppressor must have a current rating equal to, as a minimum, the rating of the main disconnect means as specified in Subsection 740- 2.11.1.d.(1). 539 ALASKA 2020 It must be designed for operation on 120 volts, 60 hertz, single phase circuits and be UL and EIA compliant. Connect the ground connection of the radio interference suppressor only to A C neutral. Do not connect to Earth Ground directly.
5.Light Fixture. Mount a fluorescent lighting fixture on the inside of the cabinet near the front edge. Use a fixture rated to accommodate a F15T8 lamp operated from a high power factor ballast. The lamp mu st be included. The lighting fixture “ON -OFF” switch must be a toggle switch mounted on an inside control panel. Include in the circuit a door-actuated switch that turns the light ON when the door is open and OFF when the door is closed.
6.Communications Transient Suppression. Provide a transient suppressor for the system interface communications lines when used. This suppressor must withstand a 100 ampere 10 x 700 microsecond waveform 20 times at 30 second intervals between surges without damage or degradati on to the suppressor. Apply the transient surge both line to line and line to ground. Output voltage must not exceed 8 volts line to line and line to ground. Output voltage must not exceed 8 volts line to line or 250 volts line to ground at any time during the test.
7.Control Panel . Provide and label a control panel assembly that is readily accessible from the front of the cabinet. The control panel assembly must consist of:
a.“controller power” switch to energize the controller while the signal lights are off or are being operated by the flasher. Label and rate the switch for load current.
b.convenience outlet with independent ground fault circuit protection. Use a duplex, 3-prong, NEMA Type 5- 20R grounding type outlet.
c.“auto/flash” switch which when placed in the “flash” position provides flashing operation without interrupting the controller unit power. When the switch is placed in the “auto” position the controller unit must provide normal operation.
d.“stop time/off/on” switch which when placed in the “stop time” position causes the controller unit to stop time. In the “off” position the controller unit must be active regardless of external commands. In the “on” position the timing must be normal but subject to external command interruptions.
e.“heater by -pass” swi tch to by -pass the remote heater thermostat.
f.momentary contact test switches to place calls on each vehicle and pedestrian phase. Switches must provide tactile feedback and be rated at 1 ampere, minimum, for a resistive load at 120 volts AC and at 28 volts DC. Contacts must be coin silver or gold plated and be enclosed and labeled as to their function.
e.Police Panel Assembly . Provide a labeled police panel assembly located behind the auxiliary door, consisting of:
1.“flash/automatic” switch which when placed i n the “flash” position causes the intersection displays to go into the flashing mode. When placed in the “automatic” position, the signal system must resume normal operation.
2.“signals /off” switch which when placed in the “off” position removes power from the signal bus. Do not allow power on the bus when either “automatic” or “flash” operation is selected by any means. 540 ALASKA 2020 (3) removable, rigid metal cover on the back of the police panel to cover the live switch terminals.
f.Warning Sign. The cabinet must contain a c onspicuous warning sign against operation without the conflict monitoring device being installed.
2.Special Features . Provide special features if called for on the Plans or as specified in the Special Provisions.
a.Intersection Display Panel . Connect the displ ay panel to the field wiring terminals, and include the following features:
1.LED indicators for 8 vehicle phase displays (R -Y-G)
2.LED indicators for 4 pedestrian phase displays (W -DW)
3.A door activated switch that turns off the display panel when the cabinet door is closed
4.Momentary detector tests switches to enter 8 vehicle phase calls and 4 pedestrian phase calls
5.A display panel that is plug connected to the cabinet and is completely removable without disconnecting individual wires
6.Approaches labeled with th e street names and the northerly direction indicated
b.Manual Phase Selector Controls . Provide the traffic signal system with manual phase selector control that permits the system to advance to any phase, including pedestrian indications, with all clearance periods timed by the controller units. Phases must be selected by a momentary contact switch, which plugs into a standard 1/4 inch 2- circuit telephone jack located in the police panel. Changes from “automatic” to “manual” phase selector control mode must be controlled by a toggle switch. Mount the toggle switch for the manual phase selector control in the police panel and clearly label it “Automatic/Manual.”
c.Coordination “Remote/Time of Day/Free” Switch. When the switch is in the “Remote” position, all supervisory functions performed on the controller unit from a master coordinator or central computer must operate normally. When the switch is in the “Time of Day” position, the local controller must use the local coordinators time of day plan. When the swit ch is in the “Free” position it must be possible to remove any or all coordination devices and maintain normal, non- coordinated controller operation without wire jumpers, jumper plugs or other special devices. Provide this switch if a local coordination or system modem/interface unit is shown on the Plans.
740-2.12 Standard Au Xiliary Equipment.
1.Solid State Flasher . Use a NEMA Type III flasher unit that conforms to NEMA Standard TS 2, Traffic Controller Assemblies , Section 6.3 Solid State Flashers.
2.Three- Circuit Solid State Load Switches . Use load switches that conform to NEMA Standard TS 2, Traffic Controller Assemblies , Section 6.2 Three Circuit Solid State Load Switches and as a minimum be supplied with Light Emitting Diode indicators on the DC input circuitry. The load switch must have 3 independent switching circuits, each being an individually replaceable solid state module. 541 ALASKA 2020 3. Conflict Monitors .
a.Use conflict monitors that are NEMA Type 12 with 12 fully programmable input channels.
b.Use a low impedance devi ce external to the unit between the input and AC (Common) if the circuit connected to the sensing input of the unit exhibits high impedance characteristics caused by dimmers or burned- out lamps.
c.Use a unit that verifies each yellow change interval for a mi nimum display period of at least 2.7 ±0.1 seconds. The yellow change interval is the time which the yellow field terminal input is active. When the minimum yellow change interval is not satisfied, the conflict monitor must transfer the output relay contact s to the fault condition.
4.Flash Transfer Relay . Use flash transfer relays that meet the requirements of NEMA Standard TS 2, Traffic Controller Assemblies , Section 6.4 Flash Transfer Relays.
740-2.13 SPECIAL AUX ILIARY EQUIPMENT. Use the following special auxiliary equipment
when called for on the Plans and/or Special Provisions:
1.Inductive Loop Detectors . Provide inductive loop detectors that conform to the requirements of NEMA Standard TS 1, Traffic Control Systems , Section 15, Inductive Loop Detectors.
2.Local Coordination Units . Provide local coordination units that are solid- state, utilizing digital timing. The units must be compatible with existing master systems.
a.Controls . Each coordination unit must provide the following minimum supervisory control of the local controller unit:
1.3 cycles
2.3 offsets for each cycle
3.Free Call results in independent operation of the local controller unit
4.3 permissive periods
5.3 split selections
6.Short direction offset seeking
7.Call to non- actuation during coordinated operation
b.Cycle. Adjustable over a minimum range of 40 to 150 seconds in a maximum of 5 second increments.
c.Offsets . Selectable as a percentage of the cycle length in 1 percent increments from 0 percent to 99 percent, or in 1 second increments.
d.Free Call . By suitable c onnections at the local controller, the effect of “Free Call” may be omitted. In this case, when the System Master calls for free operation, the local coordinating unit must operate to provide the shortest cycle and the associated average offset.
e.Permissiv e Periods .
1.First Vehicle Permissive . During this period, the coordinator must yield the controller to the selected, non- actuated phase(s). The end of this period must be capable of being set at any 1 percent or 1 second interval. 542 ALASKA 2020 (2) First Pedestrian Permissiv e. This period may be of fixed duration and must start concurrently with the First Vehicle Permissive. It must terminate no more than 7 percent later. During this period, the coordinator must yield the controller to the selected, non- actuated vehicle plus pedestrian phase(s). When the coordinator yields to a vehicle during this period, the associated phase must be inhibited until the following cycle.
3.Second Vehicle Permissive. Both the start and end of this cycle must be capable of being set at 1 percent or 1 second increment of the cycle. During this period, the controller must respond to pedestrian and vehicle calls, for the pre- selected phases.
f.Force Offs .
1.Equip the coordinator with 2 independent, ring- related, force off functions.
2.The force off function must cause the local controller to terminate the right -of-way of the appropriate phase.
3.Force off points must be selectable to any 1 percent or 1 second increments of the cycle.
g.Offset Seeking. The coordination unit must seek any new offset in the shortest direction at a rate not to exceed 20 percentage points per cycle.
h.Call to Non- Actuation. The coordinator must provide an output that may be used to energize the call to non- actuation and inhibit the maximum termination inputs to the local controller.
i.Conn ectors . Provide a front panel mounted, MS -type connector for all input/output circuit connections.
3.System Modem/Interface Unit . Supply a system modem/interface unit assembly that is compatible with the existing computerized traffic control system.
4.Preempti on Units . Provide preemption units that are solid- state with digital timing. Equipment must be shelf -mounted, with a front panel MS -type connector. Design preemption equipment to use the controller functions and timing capabilities to the maximum extent. I nstalling the preemption equipment must not alter the internal wiring of the controller unit. The preemption units may be an integral part of the controller unit.
5.Special Logic .
a.Use special logic circuits that are solid- state with digital timing.
b.Build sol id-state logic or timing circuits (external to the controller unit) on edge- connected, plug-in, printed circuit boards. Build up logic circuits by plugging logic circuit boards into wired connectors. When using 5 or less plug- in logic circuit boards, inst all the circuit board connectors in a chassis or rack mounted on a cabinet wall. Provide MS -type connectors to permit removal of the chassis or rack without unsoldering connections or removing wires or cables from the cabinet. When using more than 5 plug- in logic circuit boards, install the circuit board connectors on a chassis designed for shelf mounting. Provide this chassis with a Type MS connector. It must be shelf -mounted. 543 ALASKA 2020 c. Obtain approval when using special logic circuits before the controller cabinet and equipment are fabricated by the supplier.
740-2.14 VEHICULAR S IGNAL HEADS. Provide Light Emitting Diode, (LED) Signal Heads that
conform to the following publications: Circular Indications: Vehicle Traffic Control Signal Heads: Light Emitting Diode (LED) Circular Signal Supplement , 6/27/05 (ITE Publication ST -052). This is hereafter referred to as “VTCSH -Circular -05”. Arrow Indications: Vehicle Traffic Control Signal Heads – Light Emitting Diode (LED) Vehicle Arrow Traffic Signal Supplement , 7/1/07 (ITE Publication ST -054). This is hereafter referred to as “VTCSH -Arrow -07”. “The applicable ITE Specification”, as used in this specification, means VTCSH -Circular -05 for circular LED indications and VTCSH -Arrow -07 for arrow LED indications.
1.Signal Heads . Use signal heads that: are the adjustable, vertical type with the number and type of lights specified; provide a light indication in one direction only; are adjustable through 360 degrees about a vertical axis; and are mounted at the location and in the manner shown on the Plans. Ensure that all vehicular signal heads at any one intersection, except for programmed visibility signal heads, are of the same make and type. Provide a removable aluminum tunnel visor with an open slot at the bottom for each optical unit. Furnish housing, backplates and visors factory finished with a single coat of environmentally safe, ultraviolet -resistant, polyester powder coating that is applied electrostatically at 90kV and baked for 20 minutes at 400 degrees Fahrenheit per ASTM D3359, ASTM D3363 and ASTM D522. Coating to be a Dull Black finish meeting Federal Standard 595b- 37038.
a.LED Optical Units . Use LED optical units and lenses meeting the requirement of the applicable ITE specification for all indications. Also meet t he following requirements:
1.Gaskets. Use one- piece EPDM (ethylene propylene rubber) gaskets to seal LED modules.
2.Markings . Provide LED Signal module with manufacturer applied markings listed in Section 3.6, Module Identification, of the applicable ITE Speci fication. For circular indications marking shall include: “Manufactured in conformance with the ITE Vehicle Traffic Control Signal Heads: LED Vehicle Circular Traffic Signal Supplement (June 27, 2005).” For arrow indications, marking shall include: “Manufactured in conformance with the ITE Vehicle Traffic Control Signal Heads: LED Vehicle Arrow Traffic Signal Supplement (July 1, 2007).”
3.Compatibility . Use LED signal modules that are operationally compatible with currently used controller assemblies (sol id state load switches, flashers, and conflict monitors).
4.Testing Requirements .
a.All LEDs Functional. LED modules with any non- functioning individual LEDs at the final inspection will be rejected. 544 ALASKA 2020 (b) Burn -in. Manufacturer shall energize each new LED modu le for a minimum of 24 hours at operating voltage before shipment to ensure electronic component reliability.
c.Production Testing and Inspection . Submit manufacturer’s certification that all tests in Section 6.3 of the applicable ITE Specification have been successfully completed on each LED module to be used on the project. Show results of each individual test on the certification.
d.Design Qualification and Quality Assurance Testing by an Independent Lab. Have ETL/Intertek or other approved OSHA “National ly Recognized Testing Laboratory” do the following: Perform an initial assessment of the manufacturer’s factory, engineering and manufacturing systems, and procedures to confirm compliance with ISO 9000. Perform initial Design Qualification Testing as spec ified in Section 6.4 of the applicable ITE specification. Every 6 months, conduct a factory inspection and perform Quality Assurance Tests on two samples of each certified LED module in accordance with the following sections of the applicable ITE specification: Conditioning 6.4.4.1 - 6.4.4.4 Luminous Intensity 6.4.4.6 Chromaticity 6.4.6.1 Current Consumption 6.4.6.6 Power Factor 6.4.6.7 Total Harmonic Distortion Provide a certification label on each certified LED traffic signal module verifying the manufacturer’s factory and modules passed the tests listed in a. through c. above.
e.Warranty. Provide written warranty by the signal module manufacturer that covers defects in materials, workmanship, and compliance with the applicable ITE specification for a period of 60 months after the manufacture date. No new LED module will be accepted if its manufacture date is more than 12 months before the date of installation. Begin warranty period for modules that replace failed modules on the date of installation. The warranty shall require the manufacturer to replace LED modules that fail within the warranty period with new LED modules at no cost to the Department, and to cover the cost of shipping failed modules. The warranty does not include the cost of removi ng failed modules or reinstalling new modules. Warranty shall require the manufacturer to send the Department prepaid authorization to return the failed module and provide a toll free telephone number for notifying them when it becomes necessary to return failed LED modules. The warranty shall require the manufacturer to deliver replacement LED modules within 5 working days of receiving failed modules to the location specified by the Department.
2.Housing. 545 ALASKA 2020 a. Use die cast aluminum, meeting ASTM B85, for all par ts of the housing, including the doors and end plates. Ensure all parts are clean, smooth, and free from flaws, cracks, blow holes, or other imperfections.
b.Use a one- piece housing with integral top, bottom, sides, and with square doors, for each signal se ction.
c.Use stainless steel for all exposed bolts, screws, hinges, pins, and door -locking devices. Use stainless steel or approved non- ferrous, corrosion- resistant material for all interior screws and fittings .
d.Provide an opening in the top and bottom of each housing to accommodate standard 1-1/2 inch pipe fittings and brackets.
e.Provide the top and bottom openings of each housing with integral serrated bosses that will provide positive positioning of the signal head in 5- degree increments to eliminate undesirable rotation or misalignment of the signal head as well as between sections. Provide a total of 72 teeth in the serrated boss. Ensure teeth are clean and sharp to provide positive positioning with the grooves of the mating section or framework.
f.Fasten individual signal sections together with a cadmium -plated tri -stud connector, lockwashers, and nuts with access holes for the passage of electrical conductors from one section to another.
g.Provide 2 integral hinge lugs on the left side of each signal housing for mounting the door.
h.Provide 2 latches with stainless steel wing nut assemblies on the right side of each signal housing to engage the door latches.
i.Provide each signal housing door opening with a one- piece EPDM gasket around the periphery to prov ide a weather tight seal in a NEMA Type 3R enclosure.
j.Provide a round opening designed to accommodate any standard traffic signal lens in each signal housing door.
3.Backplates. Furnish and attach backplates to all vehicle signal heads except post -mounted flashers. Construct backplates of 0.1- inch minimum thickness aluminum alloy sheet meeting ASTM B209, alloy 3003- H14. Use 8 inch wide backplate extensions for 12- inch displays and 5- 1/2 inch wide backplate extensions for 8- inch displays. When there are 2 or more backplate sections, fasten them together with aluminum rivets or bolts and peen after assembly to prevent loosening. Use 5 or 5- 1/2 inch wide backplate extensions (borders) for all post mounted and pole side mounted vehicle signal heads. Provide nomi nal 5 -inch wide backplate extensions on all 5 section overhead cluster mounted signals. Provide backplates with nominal borders of 8 inches for the 8- inch sections and 5 inches for 12- inch sections on all combination 8- inch/12- inch vertical mounted signal heads. Factory finish the back and front faces of backplates with a single coat of environmentally safe, ultraviolet -resistant, polyester powder coating that is applied electrostatically at 90kV and baked for 20 minutes at 400 degrees Fahrenheit per ASTM D 3359, ASTM D3363 and ASTM D522. Coating to be a Dull Black finish meeting Federal Standard 595b- 37038. 546 ALASKA 2020 740-2.15 PEDESTRIAN SIGNALS. Use LED Pedestrian Countdown modules that use the international "HAND/WALKING PERSON" symbols. Except for the countdown indication and as otherwise noted in this specification, use modules that conform to “Pedestrian Traffic Control Signal Indications - Part 2: Light Emitting Diode (LED) Pedestrian Traffic Signal Modules” Institute of Transportation Engineers, 3/19/2004, (hereafter referred to in this document as “PTCSI -04”) and to the applicable Sections of the current Alaska Traffic Manual.
1.Pedestrian Signal Modules : Provide Portland Orange “HAND” and “COUNTDOWN DIGITS” and lunar white “WALKING PERSON.” Locate COUNTDOWN DIG ITS adjacent to the associated UPRAISED HAND. Make “HAND” and “WALKING PERSON” symbols a minimum of 11 inches high and 7 inches wide and COUNTDOWN DIGITS a minimum of 9 inches high and 7 inches wide. Provide incandescent looking WALKING PERSON, HAND and COUNTDOWN DIGITS. Ensure the WALKING PERSON, UPRAISED HAND and COUNTDOWN DIGITS are not readily visible when not illuminated. Provide “AlInGaP” Portland Orange LEDs or equivalent, rated for 100,000 hours or more at 77ºF and 20 mA. Provide “InGaN” White LEDs. Make all exposed components of modules suitable for prolonged exposure to the environment, without appreciable degradation that would interfere with function or appearance. Provide modules with an installed gasket to seal the junction with the si gnal housing.
a.Lens . Use modules with internal masks to prevent the icons and digits from being visible when not in operation. No external silk -screen is permitted. Provide a smooth or textured lens of transparent polycarbonate material, frosted to prevent sun phantom. Use lenses that will not crack, craze or yellow due to solar UV exposure typical for a south -facing Arizona desert installation, after a minimum of 60 months in service.
b.Retrofit . When a module will replace an existing module in an existing signal housing, furnish signal modules designed as retrofit replacements for existing neon type pedestrian signals (ICC 4090 and/or 4094). Provide modules that do not require special tools for installation. Provide modules that fit securely into existing pedestrian signal housings without any modification to the housing, connect directly to existing electrical wiring, and form a weather -tight seal. Provide modules and components constructed so each retrofit of existing pedestrian signals only requires the removal of the existing neon message module, gasket, and power supply and installation of the new LED pedestrian countdown module. Provide all necessary components to complete conversion including a one piece gasket.
c.Photometric Requirements . Meet the following requirements:
1.Minimum Luminance. Maintain the following minimum luminance values for at least 60 months, under the operating conditions defined in Sections 3.3.1 and 5.2.1 of PTCSI -04 (when measured normal to the plane of the icon surface):
a.WALKING PERSON 2,200 cd/m2,
b.UPRAISED HAND 1,400 cd/m2,
c.DIGITS 1,400 cd/m2 (when “88” is displayed).
2.Maximum Luminance. Provide modules for which the actual luminance of a module does not exceed three times the minimum maintained luminance, as defined in Section 4.1.1 of PTCSI -04, when operated within the temperature range - 40°F to +165°F 547 ALASKA 2020 (3) Uniformity : Provide modules for which the uniformity of the signal output across the emitting section of the module lens (i.e. icons or digits) does not exceed a ratio of 5 to 1 between the maximum and minimum luminance values as measured in 0.5 in. diameter spots.
4.Markings . Permanently mark the back of each LED signal module with:
a.Manufacturer’s name, trademark, and other necessary identification
b.Warranty information
c.Rated voltage and power consumption in volt -amperes
d.An up arrow or the word “UP” or “TOP” for orientation within a signal housing.
d.Electrical. Provide LED pedestrian countdown signal modules that:
1.are operationally compatible with currently used controller assemblies (solid state load switches, flashers, and conflict monitors).
2.have a maximum of 4 each secured, color coded, 36 inches long, 600V, 18 AWG minimum, jacketed wires, conforming to the National Electrical Code, rated for service at +221ºF for electr ical connection.
3.operate from a 60 ±3 Hz AC line over a voltage range of 80 VAC to 135 VAC. Test voltage for all photometric performance measurements shall be 120 ±3 volts rms.
4.use LED circuitry that prevents perceptible flicker over the voltage range specified above.
5.include voltage surge protection against high- repetition noise transients and low - repetition noise transients as stated in Section 2.1.8, NEMA Standard TS -2, 2003. Module must meet the following test requirements: Section 8.2 IEC 1000- 4-5 & Section 6.1.2 ANSI/IEEE C62.41.2, 3kV, 2 ohm and Section 8.0 IEC 1000- 4-12 & Section 6.1.1 ANSI/IEEE C62.41.2, 6kV, 30 ohm.
6.have a current draw sufficient to ensure compatibility and proper triggering and operation of load current switches and conflict m onitors in signal controller units. When the module is switched from the On state to the Off state the terminal voltage shall decay to a value less than 10VAC RMS in less than 100 milliseconds when driven by a maximum allowed load switch leakage current of 10 milliamps peak (7.1 milliamps AC).
7.have a maximum power consumption at 77°F of: Hand 11.0 watts, Walking Person 8.0 watts, Digits 10.0 watts (when display shows “88”)
8.have waterproof strain relief and anti -capillary wires, or have electrical wires that do not penetrate the LED module housing. This is intended to prevent water seepage between the back cover and the electrical wires, or between the copper and insulation of the wires (Connection may be made by use of an over molded connector).
9.will defa ult to the hand symbol for abnormal conditions when nominal voltage is applied to the unit across the two phase wires (rather than being applied to the phase wire and the neutral wire). 548 ALASKA 2020 (10) have three separate power supplies: one each for the Walking Person, t he Upraised Hand and the countdown digits. Use separate circuitry to power the LED Walking Person icon and the LED Upraised Hand icon, in order to virtually eliminate the risk of displaying the wrong icon.
e.Testing Requirements .
1.All LEDs Functional . LED modules with any non- functioning individual LEDs at the final inspection will be rejected.
2.Burn -in. Manufacturer shall energize each new LED module for a minimum of 24 hours at operating voltage before shipment to ensure electronic component reliability.
3.Production Testing and Inspection by Manufacturer . Submit manufacturer’s certification that all tests in Section 6.3 of PTCSI -04 have been successfully completed on each LED module to be used on the project. Show result of each individual test on the c ertification.
4.Design Qualification and Quality Assurance Testing by an Independent Lab. Have ETL/Intertek or other approved OSHA “Nationally Recognized Testing Laboratory” do the following:
a.Perform an initial assessment of the manufacturer’s factory, engineering and manufacturing systems, and procedures to confirm compliance with ISO 9000.
b.Perform initial Design Qualification Testing as specified in Section 6.4 of the PTCSI -04.
c.Every 6 months, conduct a factory inspection and perform Quality Assurance Tests on two samples of each certified LED module in accordance with the following sections of PTCSI -04: 6.4.2 Conditioning 6.4.4.1 - 6.4.4.4 Luminous Intensity 6.4.4.6 Chromaticity 6.4.6.1 Current Consumption 6.4.6.6 Power Factor 6.4.6.7 Total Harmonic Distortion
d.Provide a certification label on each certified LED traffic signal module verifying the manufacturer’s factory and modules passed the tests listed in a. through c. above.
f.Warranty . Provide a manufacturer’s written warranty that covers defects in materials, workmanship, and compliance with PTCSI -04 for a period of 60 months after the manufacture date. No new LED module will be accepted on a project if its manufacture date is more than 12 months before the date of installation. Begin warranty pe riod for modules that replace failed modules on the date of installation. The warranty shall require the manufacturer to replace LED modules that fail within the warranty period with new LED modules at no cost to the Department, and to cover the cost of shipping failed modules. The warranty does not include the cost of removing failed modules or reinstalling new modules. Warranty shall require the manufacturer to send the Department prepaid authorization to return the failed module and provide a toll free telephone number for notifying them when it becomes necessary to return failed LED modules. 549 ALASKA 2020 The warranty shall require the manufacturer to deliver replacement LED modules within 5 working days of receiving failed modules to the location specified by the Department.
g.Countdown Module Functions .
1.General . Begin the countdown at the beginning of the FLASHING HAND indication. End the countdown at “0” at the end of the FLASHING HAND indication. Make the countdown display dark from the end of one FLASHING HAND indication until the beginning of the next. Display steady, not flashing, countdown digits. Do not provide user accessible switches, controls, or options that would allow modification of cycle time, icons, digits or that would allow the countdown to opera te while the WALKING PERSON or STEADY HAND is displayed.
2.Learning Cycle. At power on, make the countdown display dark for one learning cycle in which it will determine the duration of the FLASHING HAND indication.
3.Normal Operation. Display the countd own/FLASHING HAND for the duration measured in the learning cycle for every cycle until the module measures a different FLASHING HAND duration.
4.Countdown Duration Modification . When a different duration is measured, make the countdown dark for the next c ycle, and enter a Learning Cycle as previously described. Resume Normal Operation with the new FLASHING HAND duration if the measured FLASHING HAND duration for the next cycle is the same as for the first cycle when a change was detected. Continue Learning Cycles, if the duration is different, until the measured FLASHING HAND duration is the same for two cycles. Resume Normal Operation with the new duration when that happens.
5.Countdown Truncation. Make the digits dark if the controller output displays a STEADY HAND or if both the HAND and WALKING PERSON go dark, regardless of whether the countdown to zero has been completed.
6.Preemption. Handle preemption events as described under Countdown Duration Modification and, if necessary, Countdown Truncation.
7.Recycling. Allow for consecutive cycles without display of the STEADY HAND .
8.Power Outage. Maintain an uninterrupted countdown during short power failures (<1.5 seconds). Make the digits dark after a loss of power of more than 1.5 seconds and enter a Learning Cycle when the power is restored.
2.Housing:
a.Provide signal housings that have maximum overall dimensions of 18- 1/2 inches wide, 18-3/4 inches high, and 9 inches deep, including Z -crate- type visor and hinges.
b.Provide a dustproof and weatherproof housing that allows easy access to and replacement of all components.
c.Provide a one- piece, corrosion- resistant, aluminum -alloy die -cast case complete with integrally cast top, bottom, sides and back. Provide 4 integrally cast hinge lug pairs, 2 at the top and 2 at the bottom of each case, for operation of a swing- down door.
d.Provide 1 of the following 3 versions of the case, according to project specifications: 550 ALASKA 2020 (1) Clamshell mount, with hardware, for “pole left of message” installation. These need not include upper and lower openings, but when provided the openings must be plugged to be weather -tight.
2.Clamshell mount, with hardware, for “pole right of message” installation. These need not include upper and lower openings, but when provided the openings must be plugged to be weather -tight.
3.Make suitable for either post top or bracket mounting with upper and lower openings to accommodate standard 1- 1/2 inch pipe brackets. Plug unused openings to be weathertight. Integrally cast a shurlock boss into the bottom opening of the signal case. Make the dimensions of the shurlock boss as follows: outside diameter, 2 -5/8 inch; inside diameter, 1- 31/32 inch; number of radial teeth, 72; and depth of teeth, 5/64 inch. Use clean and sharp teeth that provide full engagement to eliminate rotation or misalignment of the signal.
e.Make the door frame a one- piece, corrosion- resistant, aluminum -alloy die -casting, complete with 2 hinge lugs cast at the bottom and 2 latch slots cast at the top of each door. Attach the door to the case by means of two Type 304 stainless steel spring pins. Attach 2 stainless steel hinged bolts with captive stainless steel wing nuts and washers to the case with the use of stainless steel spring pins. Provide a door that will latch and unlatch without the use of tools.
3.Conductors : Meet IMSA specifications 20- 1 with No. 14 AWG or larger.
4.Load Switches : Place all load switches for operation of pedestrian signals in the controller cabinet.
5.Fasteners . Use machine screws, studs, and washers that are stainless steel.
6.Gaskets : Use gaskets that conform to ASTM D1056, Grade 2C2.
7.Terminal Blocks : Mount a terminal block in the unit for field wiring, as specified in Subsection
740-2 14.
8.Finish . Factory finish the outside of pedestrian signal head housings and visors and signal visor interiors with a single coat of environmentally safe, ultraviolet -resistant, polyester powder coating that is applied electrostatically at 90kV and baked for 20 minutes at 400 degrees Fahrenheit per ASTM D3359, ASTM D3363 and ASTM D522. Coating to be a Dull Black finish meeting Federal Standard 595b- 37038.
740-2.16 PEDESTRIAN PUSH BUTTONS. Tamper -proof with a 2- inch minimum diameter
concave or convex chrome or stainless steel telescoping- type plunger. Construct a weatherproof assembly designed to prevent an electrical shock under any weather condition and grounded per the NEC. Push button switch. Provide a phenolic -enclosed precision snap- acting type, switching unit, single- pole, double- throw, with screw type terminals, rated 15 amperes at 125 volts, AC. Must have the following characteristics:
1.Switching unit with a stainless steel plunger actuator and a U -frame to permit recessed mounting in push button housing.
2.Switch operating force of 9 to 13 ounces and a minimum release force of 4 ounces. Where a pedestrian push button is to be attached to a pole, shape the housing to fit the curvature of the pole to provide a rigid installation. Provide saddles to make a neat fit. 551 ALASKA 2020 Where a pedestrian push button is to be mounted on top of a 2- 1/2 inch diameter post, provide the housing with a slip- fitter with screws for securing to the post. Factory finish pedestrian push button housings, mountings, brackets and fittings with 2 coats of dark olive green enamel. Painting is not required where the color is an integral part of the component material.
740-2.17 FLASHING BE ACONS. Each beacon consists of a single section traffic signal head,
meeting the provisions in Subsection 740- 2.14 with yellow or red lens as shown on the Plans. Each flashing beacon control unit consists of a circuit breaker, flasher, and terminal block housed in a single enclosure. Provide a NEMA Type 3R enclosure with top- hinged cover, hasp for sealing cover, and provisions for locking. Furnish and install a radio interference and transient suppressor in the enclosure, meeting the requirements of Subsection 740- 2.11.1.d.(3) and (4). Mount 20 amp, single- pole, 120 volt AC switches at the top and center of the dead front panel. Use a solid state NEMA Type 3 flasher meeting the requirements of NEMA Standard TS 1- 1989, Traffic Control Systems . Use 20 amp, 600 volt barrier -type terminal blocks, molded from phenolic material, with plated brass screw -type terminals and integral -type marking strips.
740-2.18 Luminaires.
1.Mast Arm Mounted Luminaires . Furnish luminaires that:
a.Have high pressure sodium lamps with a rated life of 24,000 hours based on 10 hours per start, or LED lighting fixtures with minimum 100,000 hour design life
b.Include a terminal block for terminating the illumination tap conductor s
c.Feature an easily removed hinged door or tray used exclusively for mounting the ballast or driver
d.Provide the illumination levels and uniformity specified (or better) in the arrangements listed on the Plans when calculated according to the American Natio nal Standard Practice for Roadway Lighting, A.N.S.I./I.E.S RP -8, dated 1983
e.Include a lamp- starting aid that plugs into a socket for easy replacement
f.Feature a wire way meeting NEC requirements for installing three size 10 AWG conductors with type XHHW -2 insulation between the pole and a terminal block located in the luminaire
g.Have reflectors free of substances (such as paint) that affect photometric performance Furnish the Engineer with manufacturer’s current electronic photometric data in Illuminating Engineering Society (I.E.S.) format to verify illumination levels and uniformity ratios. Provide mast arm mounted luminaires with slip- fitters designed for mounting on 2- inch nominal diameter standard pipe. 552 ALASKA 2020 Use refractor -type lenses made of borosilicate glas s, unless polycarbonate resin refractors are called for in the Plans or Special Provisions. When polycarbonate resin lenses are called for, mold the lens in a single piece from polycarbonate resin when approved for use by the manufacturer. Do not use rewor ked compound whose properties have been impaired by previous molding operations. Use lenses free from cracks, blisters, burns, and flow lines, and furnished with the natural molded surface. Lenses must be of uniform density throughout and be free from air, gas, or moisture pockets, and uncured areas, as consistent with good manufacturing practice. Lenses must be transparent with a clear bluish tint, produced from resin which has been suitably ultraviolet stabilized to reduce the effects of ultraviolet radia tion on their color properties. Use resins which meet the requirements for the self -extinguishing classification of ASTM D635. Resin must have a minimum impact strength, Izod notched of 12 foot -pounds per inch when tested according to ASTM D256, Method A, using a 1/8 inch x 1/2 inch bar molded according to ASTM recommended practice. Furnish a certificate of compliance from the lens fabricator that all requirements contained in the paragraph above have been met. Mount the refractor in a door frame assembly which is hinged to the luminaire at the house side and fastened at the street side with an automatic type latch. Force the refractor and door frame assembly upward at the street side by spring pressure, against the gasket seat, when in the closed and latch ed position. Gasket material must be capable of withstanding the temperatures involved and be securely held in place. Manufacture all parts of the luminaire from corrosion- resistant materials. When cut off fixtures are specified, the optical assembly must provide 90- degree cutoff and shielding; consist of a die cast aluminum lens holder with a aluminum alglas finish, hydroformed gasketed reflector, and a heat impact resistant mogul multiple screw shell socket with lamp grips. Provide an adjustable socket holder with 2 vertical positions. Furnish an activated charcoal filter in the optical assembly to prevent particulate and gaseous contamination. Use a reflector that is specifically designed to produce an ANSI, IES (MC -III, S-C-II) light distribution when us ed with 200 through 400 Watt High Pressure Sodium lamps. Use a flat plate glass lens on the fixture. No part of the lens may project below the metal housing of the luminaire. Submit the manufacturer’s luminaire specifications and photometric data for approval, per Subsection 660- 2.01.
2.High Tower Luminaires. Use luminaires with 480- volt, 1,000- watt, high pressure sodium lamps. Lamps must provide 140,000 minimum initial lumens with a rated life of 24,000 hours. Provide luminaires with double fused ballasts. F urnish fuses of the size recommended by the luminaire manufacturer. Use a filtered design fixture with borosilicate glass refractor. Use a reflector with a smooth, non- porous inner surface, encased within a spun and sealed aluminum cover. Firmly attach the reflector with aluminum cover to a cast ring. The ring must be designed so that the reflector/refractor assembly may be readily attached to, or detached from, the luminaire bracket entry and lamp support assembly without completely removing the support b olts. Enclose the luminaire ballast within a die- cast aluminum housing that integrally attaches to the luminaire bracket entry and lamp support assembly. It must be readily removable without removing the luminaire from the bracket arm. 553 ALASKA 2020 Furnish the assembl y with a side entry slipfitter designed for 2- inch nominal diameter pipe with provision for ±3 degree adjustment for leveling the luminaire. Prevent the lamp from backing out by means of a stainless steel lamp clamp attached to the assembly but separate from the socket. Include an enclosed terminal block which protects all electrical connections from exposure to weather. Attach an aluminum rolled rain shield to the outside of this assembly. Furnish the luminaire distribution type shown on the Plans or speci fied in the Special Provisions. Submit manufacturer’s luminaire specifications and photometric data for the fixture for approval prior to ordering.
740-2.19 Sign Lighti Ng Fixtures.
1.Incandescent Down Light . Provide the type of sign lighting fixture, with i ncandescent lamp, shown on the Plans or as specified in the Special Provisions.
a.Hood. Cadmium plated, finished with aluminum paint, and side outlet tapped for conduit.
b.Reflector . Symmetrical 8 -inch steel. Porcelain enameled green finish on the outside and white on the inside.
c.Lamp. Provide 2,900 lumen.
2.Mercury Vapor . Fully enclosed, rain- tight, dust -tight, and corrosion- resistant. Design each fixture for mounting at the bottom of the sign on an overhead sign structure as shown on the Plans. Painting of fix ture is not required.
a.Housing. Cast aluminum alloy or other non- corrosive material conforming to the Plans. Finish all housings in a workmanlike manner with no exposed burrs or sharp edges.
b.Refractor . Glass having inner prisms with a smooth exposed face. M ount the refractor in a door frame assembly which is hinged to the body of the fixture and fastened with an automatic type latch.
c.Gaskets . Made of a material capable of withstanding the temperatures involved, and securely held in place.
d.Light Distribution. Light distribution over the sign face must conform to the isolux distribution patterns shown in the Plans. Accomplish light distribution entirely by refraction through the lens with no additional refractors or reflectors.
e.Miscellaneous . All ballasts, lam pholders, lamps, terminal blocks, and necessary fuses must conform to applicable requirements of Subsection 740- 2.21 or to the Plans.
f.Lamps . Color -improved to provide good color rendition of signs.
740-2.20 ILLUMINATIO N CONTROL. Use photoelectric controls capable of directly switching
multiple lighting systems. Furnish photoelectric units designed for pole top mounting which include a slip- fitter, terminal block, and cable supports or clamps to support pole wires.
1.Photoelectric Unit . A light sensitive element connected directly to a normally closed, single- pole throw control relay without intermediate amplifications. Plug the unit into a phenolic resin twist lock receptacle set in a cast aluminum mounting bracket with a threaded base. Screen photoelectric un its to prevent artificial light from causing cycling. Use either horizontal sensing or zenith sensing type units meeting the following:
a.A supply voltage rating of 60 Hz, 105- 277 volts 554 ALASKA 2020 b. A maximum rated load at a minimum of 1,800 volt -amperes
c.An operating tem perature range from - 40 °F to +150 °F
d.A power consumption of less than 10 watts
e.A unit base with a 3- prong, EEI -NEMA standard, twist -lock plug mounting Furnish units for highway lighting that have a “turn- on” between 10.8 and 54 lux and a “turn- off” at bet ween 1.5 and 5 times “turn- on.” Furnish units for illuminated signs that have a “turn- on” level of between 215 and 270 lux. (“Turn -on” level specified above corresponds to a switching level of approximately 430 to 540 lux measured in the horizontal plane.) "Turn -off" level must not exceed 3 times “turn- on” level. Measurements must meet the procedures in EEI -NEMA Standards for Physical and Electrical Interchangeability of Light -Sensitive Control Devices Used in the Control of Roadway Lighting.
2.Temperature Sw itch. When mercury vapor sign lighting fixtures are used, provide a temperature switch in each photoelectric control circuit for lighting systems which will:
a.bypass the photoelectric unit when the ambient temperature drops to -13 °F, and energize the mercury vapor light circuits;
b.return switching functions to the photoelectric unit upon a temperature rise of 5 to 10 °F above the turn- on temperature; and
c.have a minimum range of ( -40 °F to +40 °F), and be setable in increments no greater than 5 °F.
740-2.21 B ALLASTS. Include ballasts for high intensity discharge lamps as an integral part of
each luminaire and design for the voltages and lamp types specified in the Plans or Special Provisions. Ensure that the current needed to start the lamps is less than the o perating current. Furnish regulator -type ballasts with copper windings electrically isolated from each other, which will start and operate the lamps in temperatures down to - 40 °F. The allowable line voltage variation is plus and minus 10 percent. Equip hi gh-pressure sodium luminaires, except those with 1000 watt lamps, with magnetic regulator ballasts with the following additional operating characteristics:
1.The lamp wattage regulation spread at any time over the life of the lamp must not exceed 18 percent of nominal lamp watts at plus and minus 10 percent line voltage variations.
2.With nominal line and lamp voltages, the ballast must regulate the lamp output to within 5 percent of the ballast design center, and sustain lamp operation with a minimum 60 percent voltage drop lasting 4 seconds or less. Equip luminaires with 1000 watt high pressure sodium lamps with auto- regulator ballasts that provide a maximum 30 percent lamp regulation spread, a minimum 35 percent voltage dip tolerance, and with nominal line and lamp voltages regulate lamp output to within 5 percent of the ballast design center. Furnish ballasts, for soffit luminaires, with mounting brackets attached and equip with terminal blocks for primary connections and lamp socket preconnected to the secondary for flush mounted luminaires and with terminal blocks for both primary and secondary connections for use with suspended luminaires. 555 ALASKA 2020 Submit the ballast manufacturer’s specification sheets for review and approval.
740-2.22 HIGH TOWER LUMINAIRE LOWERING SYSTEM. Furnish an integral luminaire
lowering device that is compatible with the high tower design and consists of a head frame assembly, luminaire ring assembly, and winch assembly complete with electric motor. Provide a manufacturer’s on- site installati on technician to oversee the assembly and final adjustment of all lowering system components. A State of Alaska- designated representative must be given the option to witness the final assembly and adjustment of the lowering system, as well as the initial l ifting of the luminaires prior to placing the system in service. Furnish a complete service manual with instructions on installation, operation, and maintenence for each lowering device, winch assembly, and power drive system furnished on the project. Install one of the following high mast lowering devices wired for a single circuit, rated 480 VAC single- phase, on each high tower pole shown on the Plans. Furnish all power cords with four #8 AWG conductors. Manufacturer Model No. Options to be furnished Eagle High Mast Lighting Co. ELC-XX-GV Hot dip galvanized masthead assembly and transition plate, and integral motor Holophane Corporation LD25 Stainless steel hoist and winch cables Millerbernd Manufacturing SSLD -2 Integral winch and motor assembly The Plans will indicate the number of luminaires on each pole, each pole’s height, and whether FAA approved obstruction lights are required.
740-2.23 UNDERPASS L IGHTING SYSTEM. Use underpass luminaires that have vandal -
resistant surface- mounted fixtures installed in a galvanized welded steel enclosure as detailed on the Plans. The lamp must be a mogul based 150- watt, clear, ANSI/NEMA C78.42, horizontal mount, high pressure sodium type. The lamp must provide a minimum of 15,000 initial lumens with a rated life of 24,000+ hours based on a minimum burn period of 3 hours. Mount the ballast within the body of the fixture with a constant wattage autoregulator CWA type meeting ANSI/NEMA C78.1355 operating characteristics. See Plans for input voltage. Provide a square lens that is semi -recessed, extra thick, injection molded polycarbonate prismatic type, with internal specular aluminum reflector. The lens must provide the uniformity specified in the Plans or Specifications with a minimum spacing to mounting height ratio (S/MH) of 3.5:1, in the plane defined by the axis of the lamp, and a minimum S/MH ratio of 1:1 in the plane passing vertically through the length of the lamp axis. Provide a lens frame and side housing made of ASTM B209, alloy 6061- T6 tempered aluminum a minim um of 0.177 inch thick, or equivalent stainless steel, secured with tamper proof screws requiring a special manufacturer’s tool to remove. Provide fixtures that are Third Party listed for wet, damp, and dry locations. Fasten the fixture into the mounting enclosure with stainless steel screws accessible only from within the fixture housing. Fabricate the mounting enclosure from 0.138 inch thick mild steel with continuous welded seams and hot -dipped galvanized, as detailed on the Plans. Use wiring within the enclosure that might come in contact with the ballast rated at 390 ° F [type SR -2]. Provide a grounding screw or lug within the enclosure for a maximum No. 8 AWG ground conductor. 556 ALASKA 2020 Submit the manufacture’s fixture specifications, photometric data, and a com puter -generated lighting layout for approval prior to ordering. Calculate, by the point -to-point method, the light level on the walkway surface through the underpass with no wall, ceiling, or walkway reflectances. The calculated light level on the walking surface and the calculated average- to-minimum uniformity ratio may not be worse than the light level and uniformity ratio noted on the drawings. Center the calculation area on the light fixtures and base it on the width of the walkway less 12 inches, and the length of the walkway equal to the distance between the first and last fixtures plus a distance equal to 50 percent of the spacing between the fixtures added to each end of the walkway. You may substitute fixtures having similar construction, electrical , and light distribution characteristics, if approved. In the case of a substitution, construct the enclosure shown on the drawing to match the mounting requirements of the submitted fixture. Submit shop drawings for the enclosure for approval along with t he fixture shop drawings.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 557–584 of 584.