1995 Metric CSJ SPECIAL SPECIFICATION ITEM Fiber Optic Dynamic Lane Control Sign

Transcription

1 1995 Metric CSJ SPECIAL SPECIFICATION ITEM 6143 Fiber Optic Dynamic Lane Control Sign 1.0 Description This Item shall govern for the furnishing and installation of Fiber Optic Dynamic Lane Control Signs in designated field locations and equipment cabinets as shown on the plans, as detailed in the Special Specifications and as directed by the Engineer. 2.0 Materials 2.1 General Requirements All materials furnished, assembled, fabricated, or installed under this item shall be new, corrosion resistant, and in strict accordance with the details shown on the plans and in the specification. Fiber Optic Dynamic Lane Control Sign shall include, but not be limited to, the following: Fiber Optic Dynamic Lane Control Sign Photo Cells Dimming Device Necessary cabling and wire The Fiber Optic Dynamic Lane Control Sign shall be controlled by the Intersection Signal Controller. 2.2 Functional Requirements For improved night visibility, the signal output shall be reduced. Dimming shall be accomplished by reducing the voltage at the lamps. The cabinet shall be fitted with two adjustable threshold electronic devices connected to triple (3) photo-electric sensors located on the sign. These devices shall permit automatic light intensity adjustment, dependent on conditions at each sign location. A discernible legend shall be visible anywhere within a 60 degree cone centered about the optic axis. 2.3 Fiber Optics (Glass) The optical fiber utilized in the signal shall be of high quality step index glass. To prevent damage to the optics, each individual optical fiber bundle shall be protected by an extruded over P.V.C. jacket or if raw fiber optic glass is used, a metal backcover shall be provided. Each fiber optic harness in the signal shall contain spare bundles equivalent to five (5) percent of the total bundles employed per legend

2 2.4 Lighting Module The light source shall consist of two (2) 40 to 60 watt quartz halogen lamps consisting of a "primary" lamp and a "backup" lamp. Switching from the "primary lamp" to the "backup lamp" (and vice versa) shall be automatic in the event of lamp failure. It shall be possible to light the "primary" and "backup" simultaneously ("overbright" mode operation) to increase the light output level of each dot to overcome unfavorable conditions such as fog or intense sunlight. It shall be possible to service the lamps without the use of tools. Average lamp life shall be 6000 hours. Maximum lamp voltage shall not exceed 12 volts. The lamps shall not be rigid mounted. The lamps shall be mounted in an assembly, which utilizes materials designed to reduce the mechanical transmission of shock forces. Color filters shall be supplied as an integral part of the light projections assembly. The appropriate filter(s) shall be provided to display a white message. The lamp and reflector may be separate or single units. If lamp and reflector are separate units, it shall not be necessary to replace the reflector with every lamp change. The light intensity of each dot shall be 20 candela under normal display brightness. No color shall appear in the output points when not energized, regardless of ambient light conditions. 2.5 Electrical Interface Nominal input voltage shall be 115V plus or minus 10 percent. Each sign shall utilize one transformer per lamp in order to continue fail safe operation in the event of a failure of a transformer. The transformer shall be equipped with taps to adjust the secondary voltage function of the actual voltage at the sign location. Power consumption shall not exceed 100W for each lamp assembly when in the overbright mode. In any event of lamp failure, the signal shall continue to display a discernable legend. This feature is mandatory, even in the night intensity mode. 3.0 Sign Materials and Construction The sign materials shall conform to all the applicable provisions except for Measurement and Payment, of the Item 636, "Aluminum Signs (Type A)". The sign supports, foundation, and construction methods shall conform to all the applicable provisions except for Measurement and Payment of the Item 664, "Small Roadside Sign Assemblies". This

3 work shall be considered subsidiary to the Fiber Optic Dynamic Lane Control Sign installation. 3.1 Fiber Optic Dynamic Lane Control Sign General Construction The sign enclosure shall be constructed as one integral box housing. The sign enclosures shall be capable of withstanding wind pressure of 195 kilogram/square meter without permanent deformation. The structure of each independent housing shall be made from welded aluminum alloy. Aluminum alloy extrusions shall be bolted to this structure to form the housing envelope. The independent housing finish shall be clear anodized aluminum. With the enclosure constructed as an integral box housing, it shall be designed and constructed so as to present a clean, neat appearance and the equipment housed within shall be protected from moisture, dust, dirt, and corrosion. The housing shall be constructed of aluminum alloy 3003-H14 which shall not be less than 3.2 millimeter thick. Framing members shall be made of aluminum alloy 6061-T6. Seams shall be continuously welded by an inert gas process. Inspection doors, located at the front of the housings, shall be provided to enable easy access for routine maintenance. 4.0 Power Requirements Fiber Optic Dynamic Lane Control Signs shall meet all the specified requirements when the input power in 115 VAC plus or minus 20 VAC, 60 Hz plus or minus 3 Hz single phase. The equipment operation shall not be affected by transient voltages, surges, and sags normally experienced on commercial power lines. It shall be the Contractor's responsibility to check the local power service to determine if special design is needed for the equipment. The extra cost, if required, shall be included in the bid of this Item. 4.1 Primary Input Power Interruption The equipment shall meet all the requirements in Section 3.12 "Power Interruption" of the National Electrical Manufacturers Association (NEMA) Standard TS for Traffic Control Systems, latest revision. 4.2 Power Service Transients The equipment shall meet the requirements of Section "Transients, Power Service" of the NEMA Standard TS2-1992, latest revision. 4.3 Wiring All wiring shall meet the requirements of the National Electric Code. All wires shall be cut to proper length before assembly. Unless otherwise specified all wire shall be type XHHW properly sized for the application. No wire shall be doubled back to take up slack. Wires

4 shall be neatly laced into cables with nylon lacing or plastic straps. Cables shall be secured with clamps. Cable slack shall be provided to facilitate the removal and replacement of assemblies, panels, and modules for maintenance. 4.4 Fail Safe The equipment shall be designed such that the failure of the equipment shall not cause the failure of any other unit of equipment. Circuit breakers or fuses shall be provided and sized such that no wire component, connector, PC board, or assembly shall be subjected to sustained current in excess of their respective design limits upon the failure of any single circuit element or wiring. 5.0 Mechanical Requirements 5.1 Fiber Optic Dynamic Lane Control Sign Fiber Optic Dynamic Lane Control Sign shall be as shown on the plans and shall be designed to withstand a 160 kilometers per hour wind loading. 5.2 Connectors and Harness All external connections shall be made by means of connectors. The connectors shall be keyed to preclude improper hookups. All wires to and from the connectors shall be color coded and/or appropriately marked. All connectors shall be plated with a minimum of 25 micrometer of gold. 6.0 Environmental Design Requirements The Fiber Optic Dynamic Lane Control Sign shall meet all of its specified requirements during and after subjection to any combination of the following conditions. Ambient temperature range of minus 34º C to 70º C. Temperature shock not to exceed 17 C per hour, during which the relative humidity shall not exceed 95 percent. Relative humidity range not to exceed 95 percent over the temperature range of 4º C to 110º C). 7.0 Construction Methods 7.1 General The equipment, design, and construction shall utilize the latest available techniques with a minimum number of different parts, subassemblies, circuits, cards, and modules to maximize standardization and commonality. The equipment shall be designed for ease of maintenance. All component parts shall be readily accessible for inspection and maintenance. 7.2 Electronic Components All electric components shall comply with the Special Specification, "Electronic Components"

5 7.3 Mechanical Components All external screws, nuts, and locking washers shall be stainless steel. No self tapping screws shall be used unless specifically approved by the Engineer. All parts shall be made of corrosion resistant material, such as plastic, stainless steel, aluminum, or brass. All materials used in construction shall be resistant to fungus growth and moisture deterioration. Dissimilar metals shall be separated by an inert dielectric material. 8.0 Documentation Requirements The documentation shall be in accordance with Special Specification, "Testing, Training, and Documentation, and Warranty," Section Testing Requirements The testing shall be in accordance with Special Specification "Testing, Training, Documentation, and Warranty", Sections 2.1, 2.2, 2.4, and Measurement This Item will be measured as each unit furnished, installed, made fully operational and tested in accordance with this Special Specification Payment The work performed and materials furnished in accordance with this Item and measured as provided under "Measurement", will be paid for at the unit price bid for "Fiber Optic Dynamic Lane Control Sign". This price shall be full compensation for all documentation and testing all equipment described under this Item; for all cables and connectors and for furnishing all labor, materials, training, and equipment necessary to complete the work