SECTION 718 - TRAFFIC SIGNALS MATERIAL 718.01 Vehicular Signal Indications
a.Vehicular signal heads for traffic signals and flashing beacons shall conform to or exceed the current edition of the ITE "Standard for Adjustable Face Vehicle Traffic Control Signal Heads". Each housing section shall be complete with a one-piece, hinged door mounting for the lens and other parts of the optical system, watertight gaskets, and simple door-locking device. The optical system shall be mounted so that the various parts may be swung open for ready access or removal. The sections shall be interchangeable and constructed so that sections can be removed or added. All new traffic signal (vehicular and/or pedestrian) heads shall have light emitting optical assemblies for all colors. There shall be a round opening in the top and bottom of each head to receive 1½ inch supporting pipe frame. All parts of the housing, including the doors and end plates shall be of die cast aluminum free from flaws, cracks, blow holes or other imperfections or polycarbonate. 7-58 All exposed bolts, screws, hinge pins, and door-locking devices shall be stainless steel. All interior screws and fittings shall be stainless steel or approved nonferrous, corrosion- resistant material. All gaskets, including door, optical assembly, exclusive of lampholder gaskets, shall be of neoprene. Lampholder gaskets shall be of a material unaffected by heat. All light emitting diode optical assemblies shall be wired so that a white wire will be connected to the ground and black or colored wire to the terminal of the LED optical assembly. The wires shall in turn be connected to the terminal block mounted inside at the back of the housing. The terminal block shall have sufficient screw type terminals to terminate all field wires and lamp wires with separate screws. The terminals to which field wires are attached shall be permanently identified or the wiring shall be color coded to facilitate fieldwork. Each LED assembly shall be provided with a removable visor hood unless tunnel hoods or louvered hoods are specified on the plans. Hoods for 8 inch sections shall be 7 inches long, hoods for 12 inch sections shall be 9½ inches long. All heads to be modified shall be retrofitted with light emitting diode optical assemblies for all colors. When 2 or more vehicular signal heads or a combination of vehicular signal heads and pedestrian signal heads are installed on 1 pole, only 1 conduit riser shall be used. The signal heads shall not be connected together by the use of liquid tight flexible metal conduit and terminal fittings. All new vehicular signal faces installed at any one intersection shall be of the same make and type. LED optical assemblies for the 8 inch units shall be 650-lumen minimum initial output, 120 volt, 100,000 hour rated life, clear traffic signal lamps. Lamps for the 12 inch units shall be 1900-lumen minimum initial output, 120 volt, 100,000 hour rated life. The intensity and distribution of light from each illuminated signal LED optical assembly shall conform to the latest revisions of the ITE "Standard for Adjustable Face Vehicle Traffic Control Signal Heads", and the "Standard for Traffic Signal LED".
b.Programmed Visibility Vehicular Indications The programmed visibility traffic signal vehicular indication shall optically determine the visibility zone of indication without the use of hoods or louvers. The projected signal may be visible or selectively veiled anywhere within 15° of the optical axis. The signal head shall be adjustable to various angles between 9° above and below horizontal. No indication shall result from external illumination and each indication shall be illuminated separately. The visibility of the signal indication shall be adjustable within the signal head to fit the lane or lanes in which traffic is to be controlled. 7-59 The illumination lamp shall be a nominal 150 watt, 115 volt AC, 3 prong, sealed beamed type, having an integral reflector and an average rated life of 6,000 hours. A dimming device shall be provided to reduce the candela at each signal head for nighttime operation to approximately 15 percent of the candlepower for daytime operation. A circular reflector with a specular inner surface shall mate the lamp to a diffusing element. An internal imaging surface shall be provided to permit an effective veiling system to be applied as determined by the desired visibility zone. The Contractor shall notify the Resident 48 hours prior to the application of the veiling system. The optical limited-diffuser shall be provided with positive indexing means and shall be composed of heat resistant glass. The objective lens shall be a high resolution planar incremental lens thermetically sealed within a flat laminate of weather resistant acrylic. The lens outline shall be symmetrical. Lens colors shall conform to the latest ITE transmittance and chromaticity standards. The signal shall be housed in cast aluminum, conforming to the latest ITE alloy and tensile requirements. Each section shall have a sun visor. The cast aluminum shall have a chromate preparatory treatment before the application of green or yellow baked enamel prime and finish. The lens cover and the interior of the case shall be flat black. Hinge and latch pins shall be stainless steel. All access openings shall be sealed with weather resistant rubber gaskets. The lamp fixture housing shall be readily accessible and lamp replacement shall not require special tools nor necessitate major disassembly. Electrical connections between the case and lamp holder shall be an interlock assembly that disconnects the lamp holder when open. Number 16 wire shall be used to connect the lamp receptacle to the signal head terminal. The signal head shall be capable of being mounted to standard 1½ inch fittings as a signal head section, as a multiple section face or in combination with other signal heads. The signal section shall be provided with a rigid connection that permits tilting from at least 9° above or below the horizontal while maintaining a common vertical line through couplers and conduit. No special tools should be needed for servicing or mounting.
c.All exposed wiring for traffic signals, beacons, solar panels, etc shall be imsa 19-1 rated and be of sufficient size to carry the full load unless approved by the resident engineer 718.02 Pedestrian Signal Indications All pedestrian signal he ad indications shall be displayed within a rectangular background and shall consist of symbolized messages (Upraised Hand and Walking Person).that shall be at least 6 inches high. All pedestrian heads shall be LED optical assemblies and shall have countdown displays. 7-60 LED optical assemblies shall be 1,900-lumen minimum initial ou tput, 120-volt, 100,000 hour rated life. When 2 or more pedestrian signal heads are installed on 1 wood pole, only 1 conduit riser shall be used. The pedestrian signal heads shall not be connected by the use of liquid tight flexible metal conduit. Pedestrian signal heads which use fiber optic bundles to form the message shall achieve the color of the messages by filters between the light source and the optical bundles. The legends shall be 5 inches minimum in height with a ⅝ inch stroke. The housing materials shall conform to the requirements for conventional pedestrian signal housings. The message shall be illuminated by a light source designed to operate on a 120-volt source and shall be rated for 100,000 hour average life. The flashing message shall be accomplished by use of a solid-state flasher required for conventional pedestrian signal indications. 718.03 Signal Mounting All trunnions, brackets, and suspensio ns used for assembling and mounting signal control faces shall be entirely weather tight. The inside area of the cross section of the tubular arms shall not be less than the inside area of 1½ inch IPS pipe to permit the signal control wires or cable to be inserted through them. After final adjustment, all vehicular and pedestrian signal he ads, regardless of mounting arrangement, shall be fastened by a positive locking device acceptable to the Resident. This device shall prevent any deviation from the position set, but shall allow for readjustment of the signal head later in the same installation or in another installation without the necessity of damaging any part of the signal head. 718.04 Vehicular Loop Detectors Vehicle detectors shall consi st of wire loops and self-contained detection equipment capable of registering independently the presence or passage of any vehicle passing over the loop at any speed up to 70 mph and at any temperature between -35 and +165°F. Each loop detector shall contain its own integral power supply and shall operate between 95 VAC and 135 VAC. The input power shall be protected by fuse or resettable circuit breaker. The detector amplifiers shall be self-tuning, solid state cons truction except for the output relay. Printed circuit design shall allow the components to be removed and replaced without permanent damage to the printed circuit boards or tracks. Detector amplifiers installed in a common cabinet shall have a frequency difference and shall not interfere with the operation of other detector amplifiers installed in the same cabinet. All input and output circuits for each amplifier shall enter b y a single connector provided with a threaded shell. All controls, indicator lights, meters, fuseholders, circuit breakers and connectors shall be mounted on the front panel of the detector amplifier. All 7-61 controls shall be adjustable without the use of tools and the controls shall be clearly and permanently identified. The detector unit shall show a visible indication of vehicle c alls. After a power interruption, the units shall return to normal operation within 30 seconds. If any vehicle stops over a portion of the loop registering a call, the detector shall be capable of detecting additional vehicles traversing the loop after approximately 15 seconds. Detectors shall detect vehicles by lanes of traffic and shall not detect traffic moving away from the intersection when properly positioned in normal travel lanes. Detection must be positive and not erratic under all actual operating conditions with the exception of storm damage to the detector. All detectors shall be capable of detecting all four-wheeled v ehicles for all lengths of lead-in up to 750 feet for single detection loops and for a combined lead-in length of 750 feet in the case of multiple loops. Detector loop wire shall be numbe r 14 THWN stranded wire, moisture and heat resistant. Lead-in cable shall conform to the detector manufacturer's recommendations. The wire shall be encapsulated in vinyl tubing over its entire length. No damage shall occur in the detector if the pavement loop or lead-in becomes short- circuited. 718.05 Microwave Detectors Microwave detectors shall work on an operational frequency of 10.525 GHZ. The detection method shall be microwave with adjustable patterns with a response time of 165 milliseconds and an adjustable hold time of 0.5 to 5 seconds. It shall be powered from 10 VAC to 24 VAC. All contacts shall be form C, 5 amp rated. The detector shall have a fail-safe microprocessor circuit so that if the unit fails it will place the controller in recall on the apparent phase. 718.06 Pedestrian Detectors Pedestrian push button detectors shall be weatherproof and constructed to eliminate the possibility of electrical shock in all weather conditions. The pedestrian push button switch shall be a phenolic enclosed precision snap-acting type, switching unit, single-pole, double-throw, with screw type terminals, rated 15 amperes at 125 volts, AC and shall have the following characteristics:
a.The switching unit shall have a stainless steel plunger actuator and shall be provided with U-frame to permit recessed mounting in push button housing.
b.Where a pedestrian push button is attached to a pole, the housing shall be shaped to fit the curvature of the pole and secured to provide a rigid installation. When required, saddles shall be provided to make a neat fit. 7-62 718.07 Controllers All controllers shall be rack-mounted, so lid state, menu driven, keyboard units conforming to the ATC 5201 v06.25 Advanced Transportation Controller (ATC) Standard. The controller shall be supplied with all necessary interfaces needed to support Advanced Transportation Controller Cabinet (ATCC) / Serial Interface Unit (SIU) communications. Controllers shall be supplied with an internal real-time clock/calendar capable of daily, weekly, and yearly events time programming. The controller shall be designed and supplied to provide the number of phases and sequencing as shown on the plans without any auxiliary equipment. Traffic signal controllers shall be supplied as follows: • Contain ATC API operational software conforming to ATC 5401 S tandard v02. • Be configured to operate in an ATCC 5301 v02 cabinet platform . • Be supplied with the appropriate version of the Linux operati ng system, Board Support Package (BSP) and internal processing levels necessary to support connected vehicle (CV) as well as local and system operations. • Shall be fully compliant with NTCIP 1201 and 1202 standards. • Include a minimum of 3 High Speed USB 2.0 ports. • Include a minimum of 3 10/100BaseT, RJ45 Ethernet connector p orts. • Meet the functional requirements of the NEMA TS-2, 2016 Stand ard, including all amendments. • Support Flashing Yellow Arrow (FYA) and Flashing Red Arrow (F RA) operation with the ability to provide a minimum of 6 flashing pairs. • Contain the ability to alter the controller unit’s internal d atabase using a built-in front panel keyboard, using a computer connected to the controller unit with a USB cable or an Ethernet cable, and remotely using the central management system application. • Be supplied and installed with the ability to collect, store, and report various measures of effectiveness (MOE’s). • Shall collect and process all 255 high resolution enumeration s as defined in the report “Indiana Traffic Signal Hi Resolution Data Enumerations”, dated November 2012. This data will be processed in the controller and available via download from the controller USB Ethernet port or, if available, via system communications. As a minimum, the controller will be set up to provide the following performance reports: - Approach delay - Preemption events - Transit Priority Events - Split Monitor - Approach Volumes - Purdue Coordination Diagrams - Arrivals on Red 7-63 - Arrivals on Green - Phase Termination - Pedestrian Delay • Be able to backup and restore Controller programing data to a USB memory device connected to the front of the controller. No additional software shall be required to perform this function. • Be able to upgrade the Controller firmware via USB memory dev ice connected to the front of the controller. No additional software shall be required to perform this function. The field electrical loading f or flash operation shall be wired through the transfer relays such that the load on the 2-circuit flasher is as balanced as possible within the limitations of the signal phasing. Electrical filtering/surge protection shall be supplied and in stalled in each cabinet in accordance with ATCC 5301 v02 requirements and the manufacturer’s recommendations. At a minimum, surge suppression shall be provided for incoming electric utility power conductors, all signal control circuits, vehicle detection, and pedestrian detection terminations. All equipment inputs, outputs, and terminals shall be identifi ed by the phase designations shown on the plans.. The reliability of the equipment shall be demonstrated by test performance detailed in 718.08 that will confirm that the controller unit, fully wired cabinet, and auxiliary equipment meet the operational and functional requirements of the plans and specifications. Each traffic controller unit, flasher and all other current in terrupting devices shall be equipped with a suitable radio interference suppressor installed at the input power point. Interference suppressors shall be designed to minimize interference in both broadcast and aircraft frequencies. Suppressors shall be designed for 125 percent of the total connected load and shall meet standards of the UL and the EIA. The type of controller, auxiliary equipment and other operatio nal features shall be as noted on the plans. All controllers shall be capable of providing flashing operati on of the signal lights, as indicated on the plans. Transfer from flashing operation or to flashing operation shall conform to the MUTCD. If noted on the plans, hardwire preempt circuits shall be prov ided for emergency vehicles and/or railroad crossings. The clearance and preempt indications shall be as noted on the plans. Preempt circuits shall function during stop and go and flashing operation unless otherwise noted. The duration of clearance and preempt intervals shall be adjustable over the range noted on the plans and shall be labeled according to function. The railroad 7-64 preempt circuit shall be designed to operate as a fail-safe loop through a normally made contact on the railroad's control relay in the railroad's control cabinet. Railroad preemption shall have precedence over all preemption intervals for other purposes. Actuated vehicle phases and actuated pedestrian phases shall b e served in that interval of the cycle indicated on the plans. Time for an actuated interval shall be taken from the non- actuated phase(s) as noted on the plans. Automatic transfer to or from flashing operation shall conform to the MUTCD. Manual advance of the intervals by use of hand cord control shall cause the controller to advance to the next programmed interval only upon pulse signal from the hand cord circuit, interval timing shall hold the interval for the minimum programmed amber and red clearance intervals. The controller unit shall be enclosed in a sheet metal case wi th protective painted finish, designed to permit easy access to the interior and removal of printed circuit boards and modules without the use of special tools. All program controls, fuses, and indicator lights shall be mounted on the front panel and shall be clearly and permanently labeled.. When on manual operation, all phases shall be called regardles s of vehicle detection and the controller shall be advanced upon pulse from the hand cord circuit, except yellow and red clearance intervals shall be timed for the duration programmed. An exclusive pedestrian phase shall not extend or recycle until a vehicle phase has been serviced. When on manual operation, all phases shall be called regardless of vehicle detection and the controller shall be advanced upon pulse from the hand cord circuit except yellow and red clearance intervals shall be timed for the duration programmed. Automatic transfer from or to flashing operation shall conform to the MUTCD. Pedestrian phases shall not be extended by actuations, during the walk or clearance interval. Actuations during the clearance intervals shall be placed in memory. Each controller supplied shall be the same manufacturer, model and contain the same firmware level and version number. 718.08 Controller Cabinet The traffic signal control equipment shall be enclosed within a dust and moisture-proof aluminum housing with an auxiliary door in door feature. The door hinge pins shall be made of stainless steel. There are two cabinet configuration options that are specified for use; a ground mounted cabinet and a pole mounted cabinet. All new controller cabinets, traffic signal or lighting, shall be configured to eliminate arc flash. All electrical equipment will be dead front, no open terminals, busbars, breakers, or exposed terminal strips. The cabinet shall be designed, constructed and installed with all necessary provisions to comply with the latest NFPA 70E requirements. All electrically live parts over 50 volts shall be covered with Lexan or a suitable physical barrier to eliminate the possibility of an arc flash. 7-65 The ground mounted cabinet shall be a NEMA “P” size cabinet (4 4”W x 26”D x 67”H). The cabinet shall be supplied with two side by side, 19” rack cages which shall extend from the bottom to the top of the cabinet. The cabinet shall be supplied with four doors; two on the front face and two on the back face. Each door shall open independently with an independent center post latching for each of the four doors. The cabinet front provides for user interface to the in-cabinet equipment including the front panel of the controller, the cabinet status displays and detection system control interface. The cabinet rear provides access for cable termination and shall only be accessed for installation and for cabinet troubleshooting. The left-side rack of the cabinet relative to facing the cabinet from the front, to be referred to as the ‘Control’ side, shall house the control devices such as the controller, Cabinet Monitor Unit (CMU) and Auxiliary Display Unit (ADU), switch packs and power distribution panel. As such, this rack shall be referred to as the “Control” side of the cabinet. The right-side rack of the cabinet relative to facing the cabinet from the front, to be referred to as the ‘Power and Auxiliary’ side, shall house the spare card cage assembly and battery back-up devices and communications elements. The ground mounted cabinet shall be supplied with 32 output channels and 48 input channels. The pole mounted cabinet shall be a Model 336S cabinet (24” W x 20” D x 46” H). The cabinet shall be supplied with a 19” rack cage which shall extend from the bottom to the top of the cabinet. The cabinet shall be supplied with two doors; one on the front face and one on the back face. The cabinet front provides for user interface to the in-cabinet devices including the front panel of the controller, the cabinet status displays and detection system control interface. The cabinet rear provides access for cable termination and shall only be accessed for installation and for cabinet troubleshooting. The pole mounted cabinet shall be supplied with 16 output channels and 24 input channels. Both the ground mount and pole mount cabinets shall be configu red to provide the following output/input channel assignments: Channel Input Output
1-8 Vehicle Phase Call 1-8 Vehicle Phase 1-8
9-12 Pedestrian Phase Call 2,4,6,8 Pedestrian Phase 2,4,6,8
13-16 Overlap A, B, C, D
17+ Special Functions - The ground mount cabinet shall be supplied with a spare equipm ent card cage assembly. This card cage assembly shall not be wired to any cabinet device, but rather used to store spare rack mounted cabinet devices such as switch packs, serial interface units (SIUs), CMUs and phase selectors. This spare rack assembly shall be located at the top of the Power and Auxiliary rack. 7-66 The cabinet shall be supplied with a global positioning system (GPS) antenna to provide an accurate time reference for the cabinet. The antenna shall be mounted at the top of the cabinet in the back-left corner of the enclosure. The antenna shall be mounted such that it provides a waterproof seal; eliminating any possibility for water penetration into the cabinet. The GPS system cable shall be connected and integrated into the controller. The cabinet shall be supplied with a police door panel located in the middle area of the front door for both cabinet types. The switches shall be mounted in the police panel and labelled as to function. Four switches shall be supplied as follows:
1.Power On/Off
2.Signal On/Off
3.Signal/Flash
4.Manual/Auto with cord The manual control cord shall be a coiled type, sealed weather proof covered hand switch extending to six feet when fully stretched. The cord shall be fastened to the cabinet via a compression type connector to provide strain relief for the cord’s electrical connections. The police door panel shall be of sufficient size so as to store the manual control cord when panel door is closed. The cabinet shall be supplied with a technician’s panel mounte d on the back of the police panel. This panel shall be supplied with the following switches:
1.Controller On/Off
2.Flash/Auto (Allows the controller to cycle while flashing)
3.Signals On/Off (Allows the controller to cycle with signal d isplays being dark)
4.Stop Time Normal/On (Provides the ability to manually activa te a controller stop time input) The cabinet shall be supplied with white LED light panels whic h shall automatically illuminate via a door open switch whenever one of the four main cabinet doors are opened for the ground mount cabinet or two main doors for the pole cabinet. The LED panels shall produce a minimum of 1,000 lumens on the Control side of the cabinet and 1,000 lumens on the Power/Auxiliary side of the cabinet and be protected by a clear shatterproof shield. The ground mount cabinet shall contain four light panels; two at the top of each rack assembly and two at the bottom portion of each rack assembly. The pole mounted cabinet shall contain two light panels; one at the top of the rack assembly and one at the bottom rack assembly. A second door open status switch per door shall activate a controller input to log a report event that one of the doors was opened. All door open status switches shall be connected to the same controller input. For the ground mount cabinet, there shall be two switches on each of the four main doors. For the pole mount cabinet, there shall be two switches on each of the two main doors. 7-67 All cabinets shall be provided with a thermostatically control led ventilating fan and throwaway glass fiber air filters. The electric fan shall have ball or roller bearings and shall have a capacity of 100 ft³ per minute. The fans shall be rated for continuous duty with a minimum service life of 3 years. The fan blades shall be supplied with a safety screen to prevent accident contact with the blades. The ventilating system shall be designed to prevent the entrance of rain, snow, dust, and insects. The fan and vents shall be arranged in such a manner that the air intake is at the cabinet bottom and the exhaust is at the cabinet top. The air intake shall be rain tight and covered with a removable filter. There shall be vents at the bottom of both front doors for a ground mount cabinet and a vent at the bottom of the single front door for the pole mount cabinets. The removable air filter shall be firmly held in place such that cracks and openings are eliminated to ensure that all air is filtered. The ground mounted cabinet shall contain two fans while the pole mounted cabinet shall contain one fan. The thermostat shall be mounted on the top interior of the cabinet and user adjustable to allow for temperature settings from a minimum of 70°F to 140°F and capable of activating the fans within plus or minus five degrees of the set temperature. The intake vent shall be rain tight and located on the bottom half of the cabinet, covered with a removable air filter. There shall be two intake vents provided with the ground mount cabinet and one intake vent supplied with the pole mount cabinet. The cabinet shall contain a pull-out drawer, 19” wide with suf ficient strength to hold a laptop computer. The top of the drawer shall be covered with a non-conductive, non-skid material and hinged such that a storage space is available to store cabinet documentation or small parts. The pull-out shelf shall be located in the rack space directly under the controller unit. The back of the control side front door shall contain a resealable, heavy-duty opaque plastic envelope with two grommets that provide mounting to two integrated hooks installed on the back side of the front cabinet door. The heavy-duty plastic envelope will be used to store cabinet wiring diagrams and operations manuals that cannot be accommodated in the pull-out draw storage tray. The pole cabinet shall accommodate all control equipment inclu ding temperature control equipment. It shall be designed to be attached to the type of pole indicated in the contract plans. If the controller cabinet is to be ground mounted, details of the installation will be shown on the plans. Piano type hinges on cabinet doors shall be fabricated of stainless steel with a stainless-steel hinge pin. The cabinet shall be supplied with reinforcing plates where the cabinet is supported by the pole hangers. The ground mounted cabinet shall be supplied with a 6” minimum high riser aluminum base that elevates the cabinet above the cabinet foundation. All manual control switches, push button control, flashing swi tch, signal switch and any other specified switches shall be located to be accessible within the outside door, without exposing the controller mechanism. The cabinet shall be supplied with detector test switch panel. This panel shall be rack mounted and located above the controller. There shall be a total of 12 switches to allow for the manual placement of detector calls into the controller. Each switch shall be clearly 7-68 labelled as to input channel and function. Each switch position shall correspond to the same controller input; switch one is for controller input channel one, switch two is for controller input channel 2, etc. Switches 1-8 shall correspond to phase 1-8 vehicle calls. Switches 9-12 shall correspond to pedestrian calls 2, 4, 6 and 8. The switch labels shall define the corresponding vehicle or pedestrian phase called and switch position function. Detector switches shall be three position and function as follows: - Up Position = Provides a constant call - Center Position = Normal operation (Phase receives call from detectors) - Down Position = Provides a momentary call The cabinet shall be supplied with a laminated door sticker. T his sticker shall be permanently affixed to the inside front control side of the cabinet door for the ground mount cabinet and the inside front side of the pole mount cabinets. At a minimum, the sticker shall contain the following information: • Vehicle detection informati on including detector channel assignment, phase assigned, approach and cabinet termination points. • If applicable, network communications information for all in- cabinet devices. This includes IP addresses, subnet mask and MAC address. • Per approach preemption information including channel, approach/direction and termination points. • Field termination chart showing per approach/per phase number ing of all signal circuits. • Signal phasing and signal plan w ith intersection geometry and signal head designations. The locks for the switch compartment door of the cabinet shall unlock with a skeleton style (#1) key. The locks for the main doors of the cabinet shall unlock with a Corbin #2 key. Two sets of two keys (main door/switch door) shall be furnished with each cabinet. The cabinet shall be supplied with a permanent label mounted o n the upper portion of the inside front main door which contains the name of the cabinet manufacturer, controller manufacturer, model/part number and year/month of assembly. All traffic signal controller cabinets shall be supplied with a GFCI duplex outlet, as well as a multi-outlet strip. The cabinet shall be supplied with a generator panel. The gene rator panel shall consist of a manual transfer switch and a twist-lock connector for generator hookup. The transfer switch knob and twist-lock connector shall be located inside a generator access panel with a separate lockable door mounted on the lower left, exterior of the control side wall of the ground mount cabinet and on the lower left side of the pole mounted cabinet. The 7-69 door shall be equipped tamper resistant hinge. The generator panel assembly shall be housed in a heavy-duty, vandal resistant, weatherproof, dustproof enclosure designed for exterior applications. The generator access panel door shall have a moveable plate to cover an opening for the generator cable. The connection to an external generator shall be a waterproof, secure connection. The connection shall allow authorized personnel; to access, connect and secure an external electrical source to the cabinet for power restoration. The generator panel door shall contain a weather proof seal and supplied with a lock accessed with a skeleton style (#1) key. The ground mounted cabinet shall be supplied and installed wit h an electric service meter socket trim and electrical service disconnect switch mounted on the exterior, Power and Auxiliary side of the cabinet. The meter and disconnect switch shall be installed centered on the side of the cabinet without doors such that it is not less than 48 inches nor more than 60 inches above final grade. The Contractor shall coordinate with the local electric utility company to determine the appropriate type of electric service meter socket trim and electrical conductors to be used. The line side cable shall be routed external to the cabinet from the ground to a 50 amp disconnect switch, then continuing to the bottom of the electric service meter socket trim, all through rigid steel conduit furnished and installed by the Contractor. The load side cable shall be routed through the cabinet and terminated on the line side of the main cabinet circuit breaker. The cable shall be routed through the interior of the cabinet such that it does not block or enter into available rack space. (removed: thus preventing that space from being used either by equipment supplied as part of the project, or future equipment that would be installed in the rack system. Joe indicated that he would add this language to the detail so it is covered.) The cable shall be routed between the edge of the rack system and the cabinet side wall, along the bottom of the cabinet and below the bottom opening of the doors. Care shall be taken by the Contractor when installing the electric service meter socket trim and electrical service disconnect switch so that there is no damage inflicted on installed devices or the rack system during the installation. All metal shavings produced during the drilling of the access hole for the electric service shall be removed from the cabinet interior by the Contractor. The Contractor shall install appropriate bushings to all cabinet penetrations. Pole mounted cabinets will require an electric service meter and disconnect switch system to be installed as indicated in the Plans or as directed by the Resident and approved by the local electric utility company. Line side cable shall be installed in a rigid steel conduit, flexible liquid tight conduit or PVC Schedule 80 conduit from the meter and disconnect to the underside of the pole mounted cabinet. All wiring shall comply with all applicable local electrical codes as well as the National Electric Code. The cabinet main doors shall be provided with a stop to limit door opening to both 90° and 180° ±10°. The door stop bar shall be a captive type mechanism that serves to keep the bar in contact with the cabinet at both stop bar ends and provided with a catch that can be operated when the door reaches these 2 positions and will hold the door open securely until released. The cabinet shall be supplied with a three-point draw roller latching system consisting of the following latching points: - Center of the cabinet (lock) - Top of the cabinet – controlled by door handle 7-70 - Bottom of the cabinet – controlled by door handle The latching points on the top and bottom of the cabinet door shall remain in the locked position until the door lock is disengaged. The locking mechanism shall be equipped with nylon rollers to secure the top and bottom of the door. The cabinet shall be supplied with a ¾” diameter shank, stainl ess steel latching handle for each door. The latching handle shall have a provision for padlocking the door in a closed position. Controller cabinets designated on the plans to be ground mount ed shall have a pliable seal composed of caulking compound or mastic placed between the cabinet base and the concrete foundation to prevent dust and dirt from entering the cabinet. A Cabinet Monitor Unit (CMU) a nd Auxiliary Display Unit (ADU) shall be supplied and installed in each cabinet. The CMU and ADU shall conform to requirements defined in the Advanced Transportation Controller Cabinet (ATCC) 5301 v02 standard. The CMU/ADU units supplied and installed as part of this project shall support 32 channels. All configuration programming shall be resident in a non-volatile Datakey device. Each CMU shall be supplied with a Datakey programmer and associated software. The Datakey programming software shall include a set-up wizard which shall assist the user with the initial set up of the device. The Contractor shall program the Datakey with data entries appropriate for each intersection. All programing resident on the Datakey shall be included in the hardcopy. The Contractor shall reconfigure the default user name and pas swords on all communications / control equipment within the ATC Controller and Cabinet. This includes but is not limited to the ATC traffic controller, ATC ancillary equipment, video detection equipment, Ethernet switches, and routers. The new user name and passwords shall be created in coordination with the MaineDOT IT staff and or as directed by the engineer; no manufacture default level passwords shall be allowed. The Contractor shall utilize network communications encryption settings on all forms of wired Ethernet data paths. No “in the clear” communications shall be allowed. At a minimum all wired Ethernet connections shall meet 802.1AE standards. The Contractor shall supply and configure a Cyber Intrusion and Prevention Device (CIPD) in each ATC cabinet. The CIPD shall prevent any unauthorized access / connections to the traffic control system. Upon detection of unauthorized attempts, the CIPD shall notify the agency via SMS message and or email and log the event. The CIPD shall be installed prior to any remote access device. The Contractor shall coordinate with the agencies Information Technology and Operational Technology (IT/OT) staff and or the engineer for finale configuration of the CIPD. No direct access to the traffic system shall be allowed without the installation of a CIPD and or Router/Firewall. A cabinet power supply shall be supplied with each cabinet. Th e cabinet power supply shall comply with ATCC 5301 v02 (EDI Model 2216-2412-HV or equivalent). 7-71 A full complement of switch packs shall be supplied with each cabinet. Switch packs shall comply with ATCC 5301 v02. A full complement of flashers shall be supplied with each cabi net. Flashers shall comply with ATCC 5301 v02. A full complement of SIUs sha ll be supplied with each cabinet. The Serial Interface Units (SIU) shall comply with ATCC 5301 v02. A full complement of flash transfer relays shall be supplied w ith each cabinet. Flash transfer relays shall comply with ATCC 5301 v02. In addition to the full complement of switch packs, flashers, SIU’s and flash transfers relays, two additional SIU’s shall be supplied. All spare equipment required to be supplied with the ground mounted cabinet shall be store in the spare equipment rack. Spare equipment required to be supplied with the pole cabinet shall be delivered to MaineDOT. The field electrical loading f or flash operation shall be wired through the transfer relays such that the load on the 2-circuit flasher is as balanced as possible within the limitations of the signal phasing. Electrical filtering/surge protection shall be supplied and in stalled in each cabinet in accordance with ATCC 5301 v02 requirements and the manufacturer’s recommendations. At a minimum, surge suppression shall be provided for incoming electric utility power conductors, all signal control circuits, vehicle detection, pedestrian detection, communications and preemption system terminations. Three copies of the database programming for all in cabinet de vices shall be provided with each cabinet. The database programming sheets shall reflect as-built programming resident in each unit at the time of acceptance. The cabinet monitor unit shall be connected to the field termi nals of the signal light circuit to provide protection against conflicting green, yellow or walk indications being simultaneously energized as a result of controller failure, relay or solid-state switch failure, short circuited field wiring or other failures. When a conflict is detected, the cabinet monitor unit shall ca use the signal system to commence flashing operation; energize the stop-timing circuit of the controller while controller power shall remain on; lock-in flashing operation until manual actuation of the momentary contact reset push button resident on the cabinet monitor unit. The cabinet shall be equipped with a thermostatically controll er fan; two fans shall be supplied and installed for the ground mount cabinet and one fan shall be supplied and installed for the pole mounted cabinet. The fans shall be rated for continuous duty with a minimum service life of 3 years. The fan blades shall be supplied with a safety screen to prevent accident contact with the blades. 7-72 The cabinet shall be supplied with a GFI outlet to be installe d on the upper left, exterior of the control side wall of the ground mount cabinet and the upper left side of the pole cabinet. The electrical outlet will be GRCI protected, house in a locked access enclosure. The GFI outlet shall be supplied via its own 15-amp circuit breaker. The GFI outlet assembly shall be housed in a heavy-duty vandal resistant, weatherproof, dustproof enclosure designed for exterior applications. The GFI enclosure door shall contain a weather proof seal and supplied with a lock accessed with a skeleton style (#1) key. The main cabinet circuit breaker shall be rated at 30 amps. Ci rcuit breakers shall be approved and listed by the UL. The operating mechanism shall be enclosed and shall be trip- free from operating handle under load and shall be trip-indicating. All circuit breakers shall be quick-make, quick-break on either automatic or manual operation. Contacts shall be silver alloy enclosed in an arc quenching chamber. Overload tripping of breakers shall not be influenced by an ambient temperature range of from 0 to +158°F. The testing process is required to ensure that the controller and cabinet assembly perform properly and meet all requirements described and required as part of this project have been met. This includes testing of all hardware and all software supplied and installed as part of this project. All tests shall be conducted in accordance with the approved test procedures developed by the Contractor. The Contractor shall submit test procedures and forms/checklists for review and approval to the Engineer. All components of the controller and cabinet shall be bench te sted for a minimum of 72 continuous hours by the Contractor at the Contractor’s facility prior to delivery to the project. Testing shall be performed by an IMSA, level 3 (Field or Bench) Certified Signal Technician using a test board and in conformance with the design loads, phasing, timing and auxiliary equipment such as pre- emption. Upon completion of satisfactory bench testing, a written approval will be supplied to the Contractor by the Engineer. This approval does not relieve the Contractor from ensuring proper operation of the equipment. The approval shall accompany the cabinet and controller when delivered to the project. At a minimum, the test plan developed by the Contractor shall contain the following sampling of test items:
a.Installation of all the equipment into the cabinet as requi red per the plans and specifications.
b.Setting of the phase timings of the controller in accordance with plans.
c.Checking all of the wiring connections for physical tightne ss.
d.Observing the sequences, timings and operations of the controller to verify conformance to the plans and specifications.
e.Test the police panel switches installed in the panel. 7-73
f.Test Pre-emption and/or Priority operation - Optical Detect or - with the receivers wired in the cabinet and using an emitter, test each pre-emption or priority run as per the plans. Hard Wired - Attach a temporary push button as per the plans and test each pre-emption or priority run as per the plans.
g.Check exhaust fan controls by applying heat from a 100-watt lamp on an extension cord to the thermostat.
h.Check heat lamp controls by cooling the thermostat.
i.Check cabinet monitor unit by testing for any conflicting G reens or Yellows by the use of a jumper wire attached to a displayed Green or Yellow and to the other non-parent Greens or Yellows to ascertain that conflicting colors are not present. Test all possible combinations of conflicting displays. Upon completion of the project, a print out of the databases contained in the controller, CMU, Preemption, Video Detection or any other equipment shall be provided to the Engineer. The databases shall be provided either via a hard copy printout or on a “thumb drive.” Tests shall be conducted by the Contractor, witnessed by the E ngineer, at the Contractor’s facility. The test facility shall be located in the State of Maine and be clean, heated/air conditioned and have provisions for the simultaneous testing of at least three (3) controller and cabinet assemblies. The controller and cabinet assembly shall be wired and programmed to provide the signal phasing, timing and operations shown on the design plans for that particular location. A test light board and a manual detector call panel shall be connected to each cabinet assembly to verify display outputs and vehicle/pedestrian input calls. This test plan, when approved and executed, must demonstrate t hat the controller and cabinet assembly meet all of the requirements contained in the project Plans and Specifications. The Contractor shall propose testing plans and submit the test plan(s) and procedures as detailed herein to the Resident and Design Engineers for approval prior to testing. Each of the test plans shall contain the following elements: • Proposed date, time, and location of the testing • Names of the Contractor personnel who will be conducting the testing • Descriptive overview of the proposed test procedure • List of test equipment required to perform the testing • Test cases and test logging forms which detail every step of the test procedure: Test logging forms shall be presented in tabular format, with separate columns for each of the following: 7-74 • Test case description detailing the test step to be performed . • Expected result • Actual result • Pass/fail • Comments The Contractor shall supply separate test logging forms at the time of testing for each test plan, and for each device location. The test logging forms shall show the device location, date, and the start and end times of the test. At the end of each test logging form, there shall be signature and date locations for each of the following: • Contractor personnel conducting the test • MaineDOT representative witness • Engineer witness Signatures on the test logging form will signify only that the test was performed and witnessed, not that it passed or failed. The detailed Test Plans shall be submitted to the Engineer no later than thirty (30) days prior to the beginning of each test phase. The Contractor shall have approved test plans prior to submitt ing a request to schedule the start of any test activities. The Contractor shall notify the Engineer no less than fourteen (14) days prior to the beginning of any equipment or systems testing. Testing shall provide verification and documentation that all requirements included in the Contract Documents are met. The Test Plans shall be developed by the Contractor to provide a mechanism that ensures that all contract requirements have been tested fully and verified. If any deviations or changes to the approved Test Plans arise, it shall be resubmitted by the Contractor for review and approval by the Engineer at least fourteen (14) calendar days prior to any planned test activity stage. No tests shall be conducted until the Engineer have approved the test plan. A summary of all tests shall be produced at the completion of each testing phase of the project to ensure that all requirements defined by the system are satisfied. MaineDOT reserves the right to examine and test or retest any or all materials furnished by the Contractor for the project to determine if they meet the requirements specified within the Contract Documents. 7-75 If MaineDOT decides that any material used in the construction of this project is defective or otherwise unsuitable, and the workmanship does not conform to the requirements of this Contract, the Contractor shall replace such defective parts and material at no cost to the Project. The times and dates of the tests shall be approved by the Engi neer. The Contractor shall conduct all tests in the presence of the Engineer. Testing shall take place only on weekdays, which are official working days, unless the Engineer allows the test to be conducted and/or continued on weekends and non-working days. The Contractor shall make a request in writing at least fourteen (14) days prior to the proposed testing, and schedule tests only if permission is granted by MaineDOT in writing. The Contractor shall be responsible for the conduct and docume ntation of the results of these tests that will be countersigned by the Engineers at the end of each test. The signature of the Engineer implies only proof of presence. Test results shall be packaged and submitted to the Engineer within one week of test completion. No test phase shall begin until all prior test phases have been completed, and test results have been approved by the Engineer. The Contractor shall utilize vendor supplied or any test speci fic software for testing, as needed, at no additional cost. 718.09 Flasher The flasher shall be a two circuit solid state device with no contact points or moving parts, producing between 50 and 60 flashes per minute with a 50 percent to 67 percent duty cycle. The flasher mechanism shall be mounted on a plug-in base with a plug-in mounting. The flasher relay shall energize the flasher and transfer signal light circuits from the controller unit to the flasher. The flasher shall be capable of breaking and carrying 10 amps on each circuit at 125 volts. All amber indications shall be on one circuit and all red indications shall be on the other circuit. The flasher shall be protected from lightning damage by a device intended for use with solid state equipment. The flashing mechanism shall be independent of the controller unit and shall remain in operation upon shutdown of the controller or removal of the controller unit from the cabinet. The pedestrian indications shall be flashed with a separate solid-state flasher. 718.10 Program Selection The weekly program selection unit shall be capable of automatically supervising the operation of cycle 1, cycle 2, cycle 3, split 1, split 2, split 3, reset 1, reset 2, reset 3, and flashing operation. The weekly program selection unit shall allow selection and/or omission of these functions to be varied on a daily basis. The weekly program selection unit shall enable function transfers to be made as often as 15 minutes. Solid state devices used to automatically select dial, reset a nd flashing modes shall meet the applicable functional requirements of mechanical devices. They shall maintain the preset program during power interruption and shall continue timing functions using a reserve power source. 7-76 718.11 Contacts and Relays All contacts used in connection wi th interval indications shall be of pure coin silver or its equivalent and shall be capable of breaking and carrying at least 15 amperes at 120 volts AC. The Contractor is directed to arrange the internal wiring and number of circuits so that the contact rating is not exceeded. All actuated controllers shall be equipped with external type signal light relays. Relays shall not be used in connection with any automatic non- flashing red, yellow or green indication in installations having pre-timed electro-mechanical equipment, without the approval of the Resident. Relays shall be designed for continuous duty. Relays shall be designed to operate at ambient temperatures from -30°F to +158°F. Each relay shall be mounted on a plug-in base with a plug-in mounting. Coils shall have a power consumption of 10 volt-amperes maximum and shall be designed for continuous duty on 120 volts, AC. A leakage resistor, which shall permit current to pass through the relay coil if the contacts should remain closed after the coil circuit is opened, shall be installed with each external signal light relay to overcome residual magnetism effects. All relays shall be of a rating sufficient to carry the electr ical loads imposed upon them. A sufficient number shall be provided so that the total load is distributed among the various circuits in such a manner that the rating of each relay is 150 percent of the load. The monitor unit shall be connected to the field terminals of the signal light circuit to provide protection against conflicting green, yellow or walk indications being simultaneously energized as a result of controller failure, relay or solid state switch failure, short circuited field wiring or other failures. When a conflict is detected, the monitor unit shall cause the signal system to commence flashing operation; energize the stop-timing circuit of the controller while controller power shall remain on; lock-in flashing operation until manual actuation of the momentary contact reset push button; remove power from the signal light circuit; disable all functions of the "Flash-Automatic" and "Automatic Manual" switches in the police panel. Each circuit of the solid state switching devices shall have a minimum rating of 1,000 watts for tungsten lamp load at 120 volts, AC. The solid state switching devices shall be plug- in mounted to a base. Solid state switching devices shall be protected from transient voltages and lightning by components especially designed for use with solid state devices. Circuit breakers shall be approved and listed by the UL. The operating mechanism shall be enclosed and shall be trip-free from operating handle under load and shall be trip- indicating. All circuit breakers shall be quick-make, quick-break on either automatic or 7-77 manual operation. Contacts shall be silver alloy enclosed in an arc quenching chamber. Overload tripping of breakers shall not be influenced by an ambient temperature range of from 0 to +158°F. 718.12 Conductors The number and size of conductors required in each cable is indicated on the plans. All conductors shall be stranded copper conductors. Multiconductor cables shall conform to the latest revisions of IMSA Specification Number 19-1 or 20-1. The service ground rod shall be 8 foot by ⅝ inch copperclad rod. The service wiring shall be single conductor number 6 AWG THW stranded copper black insulated and number 6 AWG THW stranded copper white insulated rated 600 volts. All circuits for the timer and each auxiliary control unit sha ll terminate in a multiple contact connector. Conductors shall be attached to all pins of the connector and cabled. Conductors of the cable, except spares, shall be fitted with terminal ends compatible with the terminal block and shall have identifying bands. The ends of all spare conductors shall be taped.
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Source: Standard Specifications — Highways and Bridges, 2020 Edition. Pages 762–782 of 817. View official source ↗