860 732- 5.03 Conduit: The accepted quantities of conduit, measured as provided above, will be paid for at the contract unit price per linear foot, which price shall be full compensation for the work, complete in place, including excavation, backfill and any incidentals necessary to complete the work. No direct payment w ill be made for rigid metal conduit bends or rigid non- metallic conduit bends at pull boxes, expansion fittings and coupling fittings, the cost being considered as included in the contract price for the conduit items. 732- 5.04 Pull Boxes: The accepted quantities for pull boxes, measured as provided above, will be paid for at the contract unit price each, which price shall be full compensation for the work, complet e in place, including any excavating and backfilling necessary to complete the work. 733- 1 Description: The work under this section shall consist of furnishing and installing or modifying traffic signal indication assemblies, pedestrian signal indications, flashing beacons, and mounting assemblies at the locations shown on the project plans and in accordance with the details shown on the plans and the requirements of these specifications. 733- 2 Materials: 733- 2.01 Signal Indications: All new signals, except the programmed visibility and the pedestrian types, installed at any one intersection shall be of the same manufacturer and of the same material. All traffic signal indication housings, pedestrian, indication, housing backplates, visors, louvers, mounting assemblies, and push button stations, shall receive a minimum of two coats of dull black enamel. Painting shall be done by the manufacturer.
Each vehicle signal face shall be of the adjustable vertical type with the number and type of sections specified on the plans. Adjustment shall permit rotation of 360 degrees about a vertical axis. Each vehicle signal face shall provide an indication in one direction only. TABLE OF CONTENTS INDEX 861 Unless otherwise shown on the plans, all vehicle signal faces shall contain three sections arranged vertically; red- top, yellow -center, green- bottom. Signal faces shall be standard 8-inch or 12- inch lens size.
Each optical unit shall consist of a lens, a reflector or reflector assembly, a lamp holder, and a clear traffic signal lamp of the appropriate size and type as specified herein or in the Special Provisions. The optical units shall conform to ITE Standards and ANSI Standard D 10.1.
All traffic signal face lenses shall be glass unless otherwise specified on the plans. Lenses shall be of the color indicated, circular in shape, with a nominal visible diameter as indicated on the project plans and of such design as to give an outward and downward distribution of light with a minimum above the horizontal. Each lens shall be true to color, of the best quality glass, free from imperfections, and provide high illumination transmission. Lenses shall conform to ITE Standards.
Each reflector shall be a single piece of silvered glass or specular aluminum with an anodic coating. Reflectors shall conform to ITE Standards. An opening in the back of the reflector for the lamp holder shall be constructed so that there will be no dark spots cast on the lens.
The lamp holder shall have a heat -resistant molded phenolic housing and be designed to accommodate up to a 150- watt standard A -21 traffic signal lamp, in the proper focal position.
Lamps to be used in vehicular traffic signal faces shall conform to the standards set forth in the ITE publication " Standard for Traffic Signal Lamps" and the following table, unless otherwise specified: TABLE OF CONTENTS INDEX 862 TRAFFIC SIGNAL LAMP TABLE Nominal Size Bulb Type Lens Color Initial Lumens User - Hours Rated Wattage Light Center Length 8 inch A19 Green Yellow 610 8000 60 2-7/16 inch 8 inch A19 Red 1040 8000 90 2-7/16 inch 12 inch A 21 Green Yellow Red 1750 8000 135 3 inch Pedestrian Indication A 21 White Orange 1750 8000 135 3 inch
All lamps shall be rated at 120 volts AC. Lamps shall be clear and have an aluminum reflector disc. Projection type filaments shall be used, and supported at seven points. Name of manufacturer, wattage, voltage, and user -hours shall be etched on lamps. Amount of krypton gas shall be not less than 80 percent of the total fill gas of the lamp. If requested by the Engineer, the lamp manufacturer shall provide a report by an independent testing laboratory certifying the beam candle power and composition of the fill gas.
Hardware for a standard signal section shall include a one- piece hinged door, a simple locking device, housing for lenses and other optical components, water -tight gaskets, terminal block and wiring. The sections shall be interchangeable and so constructed that sections can be added or removed. All exterior hardware such as hinge pins, bolts, screws, and locking devices shall be of 304 or 305 stainless steel. All interior screws and fittings shall be stainless steel or approved non- ferrous corrosion resistant material.
The housing for each signal section shall be a one- piece, corrosion resistant die cast or permanent mold cast aluminum conforming to ITE Standards. The housing of each section shall be designed to permit access to the section for relamping without use of tools. Fittings and locking devices shall conform to the details of the Standard Drawings. The reflector, reflector ring, lamp holder, and spring wire bail shall be designed so they may be removed or replaced without the use of tools.
The door shall be suitably hinged and securely h eld to the housing by hinge pins and locking devices. TABLE OF CONTENTS INDEX 863
Lamp holder gaskets shall be of material not affected by heat. All other gaskets, including door, lens and reflector gaskets, shall be of weather - resistant neoprene.
The terminal block for a standard three- section signal shall be a four - position, eight -terminal barrier -type strip mounted in the back of the middle unit. To the left of each terminal strip shall be attached the white, red, yellow, and green signal section leads and the opposite terminals shall be for field wires. The wires from the terminal block to the lamp socket shall be minimum size number 18 AWG, type TFF, 30- mil insulation thickness and rated at 105 degrees C .
Each signal section sh all have an 11- inch to 12- inch long tunnel -type visor which shall be fabricated from number 3003 H -16 aluminum alloy. Visor shall conform to ITE Standards and details of the plans.
Louvered backplates shall be furnished and installed on all vehicular signal sections. Anodized aluminum sheet, 16 gage, shall be used. All 12 inch signal faces shall have 5 inch backplates installed. All 8 inch signal faces shall have 8 inch backplates installed.
Where shown on the plans, di rectional louvers shall be furnished and installed in signal visors. Directional louvers shall be so constructed as to have a snug fit in the signal visors. The cylinder and vanes shall be fabricated from 5052 -H32 aluminum alloy. Dimensions of louvers and vane configuration shall be as shown on the plans. The outer cylinder and the vanes shall be 0.032 inches minimum thickness, and the vanes shall be 0.016 inches minimum thickness.
Each programmed visibility signal face shall conform to the provisions in Subsection 733- 2.01(A) of the specifications, except the provisions for optical equipment shall not apply. The programmed visibility signal section shall provide a nominal 12- inch diameter circular or arrow indication. TABLE OF CONTENTS INDEX 864 Each section shall be provided with a sun visor and an adjustable connection that permits incremental tilting from 0 to 10 degrees above or below the horizontal axis. The visibility of each programmed visibility signal face shall be adjustable within the signal for the lanes in which traffic is to be controlled. When unprogrammed, the indication shall be visible from anywhere within 15 degrees of the optical axis.
The components of the programmed visibility signal face optical assembly shall be a circlet reflector, optical limiter -diffuser and objective lens conforming to ITE Standards. A circlet reflector with a specular inner surface shall join the lamp to the diffusi on element. The optical limiter -diffuser shall provide an image focused for objects at a distance of 900 to 1,200 feet limited by a veiling system. The objective lens shall be a high resolution planar incremental lens, hermetically sealed with a flat laminate of weather resistant acrylic. The lens shall be symmetrical and able to be rotated to any 90- degree orientation about the optical axis. Each signal section with a yellow indication priority programming shall provide a minimum luminous intensity of 3,0 00 candelas on the optical axis and a maximum intensity of 30 candelas at 15 degrees horizontally from the axis. Each section shall be capable of having visibility programmed for a minimum 3,000 candelas at 2 to 15 degrees horizontal from the axis. Under the same conditions, the intensities of the red indication and the green indication shall be at least 19 and 35 percent, respectively, of the yellow indication.
The lamp for each signal section shall be a nominal 150- watt, sealed beam, 120- volt, 6,000 -hour minimum rated life lamp as specified. During daylight, the signal indications shall be visible only in the lanes designated. For nighttime operation, dimming devices shall be provided to reduce the intensity by 15 percent.
Terminal blocks shall conform to the provisions in Subsection 733-2.01(A)(2)(d) of the specifications. TABLE OF CONTENTS INDEX 865
Each fiber optic signal unit shall conform to the provisions in Subsection 733- 2.01(A) of the specifications except the provisions for optical equipment. The signal unit shall display alternate legends, consisting of either a green or yellow directional arrow. The signal unit shall be clearly legible under any lighting conditions within a 20- degree cone of vision centered about the optical axis. Visors or hoods shall have a weatherproof housing and door and shall not be required for legibility. The signal unit shall consist of a fiber optic module with individual output lenses, color filters for specified legend colors, required light sources and transformers. A separate lamp shall be used for each display, and lamps shall be rated between 10.5 and 10.8 volts. The rated lamp life shall not be less than 8,000 hours. Nineteen individual lenses, 5/8 inch in diameter, shall be fitted over the end of each fiber optic bundle to form the arrow legend. The same lenses shall be used for both displays. Fiber optics shall be glass fiber bundles assembled on a flat black matrix panel. Individual fiber optic bundles shall not be jacketed or encased. The signal shall supply approximately 50 percent more light to the lenses when displaying a green arrow in order to balance the intensity between colors. No color shall appear in the lenses when not illuminated regardless of sunlight intensity.
The complete signal unit shall be mounted in a standard aluminum 12- inch round signal case. An aluminum front panel 12 inches in diameter and lens mounts shall be colored black to minimize legibility of arrow when not illuminated. All fiber optics, transformers, and lamps shall be mounted on the door of the unit. Lamps shall be mounted horizontally to prevent their collecting water from condensation or possible gasket leaks. No moving parts are permitted. All screws, washers, nuts and bolts shall be corrosion resistant. All components shall be readily accessible when the door is opened. Maintenance or replacement of components shall require only simple tools. TABLE OF CONTENTS INDEX 866
A separate transformer having Class A insulation rated at 48.5 volt -amps shall be used for each color display to reduce the voltage to 10.5 volts AC.
The fiber optic signal assembly shall be cap able of continuous operation over a temperature range of -35 to +165 degrees F. 733- 2.02 Pedestrian Signals: Neon international man/hand symbol pedestrian signals shall be furnished and installed unless specified otherwise. Pedestrian signal assemblies shall be complete and operational with the international man/hand symbol indications, and the mounting assemblies shall be furnished and installed by the contractor as shown on the plans.
The maximum overall dimensions of the pedestrian unit including the visor shall be 18 -1/2 inches wide, 18- 3/4 inches high, and 9 inches deep. The man/hand symbols shall be in a single housing containing both message symbols. The pedestrian signals shall be energy efficient, with a maximum energy usage of 20 watts, at 120 volts.
The case shall be a one- piece, corrosion- resistant, aluminum alloy die casting, complete with integrally cast top, bottom, sides and back. Four integrally cast hinge lug pairs, two at the top and two at the bottom of each case, shall be provided for operation of a swing -down door. The case shall be properly matched to other pedestrian signal components to provide a dustproof and weatherproof enclosure and shall provide easy access to replace all components.
The door frame shall be a one- piece, corrosion resistant, aluminum alloy die casting, complete with two hinge lugs cast at the bottom and two latch slots cast at the top of each door. The door shall be attached to the case by means of two type- 304 stainless steel spring pins. Two stainless steel hinged bolts with captive stainless steel wing nuts and TABLE OF CONTENTS INDEX 867 washers shall be attached to the case with the use of stainless steel spring pins. Latching or unlatching of the door shall not require tools.
A molded support tray manufactured from black polycarbonate plastic shall protect the two neon tube light sources and the solid state controller. The tube for the "Hand" symbol shall be 10 millimeters in diameter and be coated on the inside with Portland orange fluorescent material. The tubing for the "Walking Man" symbol shall be 9 millimeters in diameter and be coated on the inside with lunar whi te fluorescent material. Both shall be formed and positioned for maximum intensity. The message lens shall consist of a 1/8- inch minimum thickness clear U.V. -stabilized, refractor -type polycarbonate plastic with outer prisms and shall be heat, craze, and water resistant. The two neon compartments shall be sealed into an integral assembly with a one- piece sponge gasket fitted around the perimeter to protect the enclosed neon tubing from handling and weather. Solid State circuitry shall be assembled on circuit boards as necessary to energize to high voltage flyback transformers and the neon tubes. Each controller circuit shall be sealed into an integral assembly with a one- piece sponge fitted around the perimeter to protect the enclosed neon tubing from handling and weather. The entire unit including neon tubing and solid state controller shall have a factory warranty of five years against defects in workmanship or materials. Each controller circuit shall be powered from 120- volt AC, 60- hertz and shall have a power factor of 90 percent minimum.
Messages shall be the Portland orange "Hand" and the white "Walking Man" illuminated by multiple configuration neon tubes encased in the plastic solid state message module. The symbols shall be a minimum of 12 inches in height and 7 inches in width and shall be configured as shown in the MUTCD. The inside face of the message lens shall be painted in all areas except where the desired symbols are formed. The first coating of paint shall be black to form a contr asting background. The second coating shall be white to reflect internal light in between symbols. TABLE OF CONTENTS INDEX 868
The visor shall be the crate type to eliminate sun phantom and shall be 1-1/2 inches deep. The crate assembly shall contain a minimum of 21 zigzag -pattern horizontal louvers and 20 straight horizontal louvers. Every other formal louver shall be reversed to form 1 -inch diamond shaped cells. The material used for the visor shall be 0.030 inches thick and shall be 100 percent impregnated black polycarbonate plastic with a flat finish.
Each incandescent pedestrian signal shall consist of a housing, two- color message plate, a reflector assembly, two incandescent lamps and a front screen. The pedestrian signal shall be furnished complete with incandescent lamps as described herein. The overall maximum dimensions of each housing, including the front screen, shall be 18- 1/2 inches wide, 18- 3/4 inches high, and 11- 1/2 inches deep.
The case and door frame for the incandescent pedestrian signals shall conform to the requirements of Subsection 733- 2.02(A) of the specifications.
Each message lens shall be one- piece and shall be made of 1/8- inch minimum thickness, ultraviolet -stabilized polycarbonate or 3/16- inch thick tempered glass. Either lens shall have a textured outside surface to eliminate message "hot spots".
Each reflector shall be a single- piece double -parabolic reflector constructed from textured plastic or aluminum. All reflectors shall conform to the requirements of ITE Standards. Plastic reflectors shall consist of vacuum -formed polycarbonate with a vacuum -deposited aluminum reflector surface and shall not distort when used with a lamp of specified wattage normally used in the signal. TABLE OF CONTENTS INDEX 869
Each lamp holder shall be positioned so as to be centered and pre - focused in its respective position when an A21 bulb with medium base is used. The lamp holder shall be made of molded phenolic and shall have a brass screw shell with lamp grip.
Each incandescent pedestrian signal shall be provided with an egg -crate type visor designed to eliminate sun phantom. The crate assembly shall consist of 15 vertical members and 26 horizontal members plus two integral locking strips to prevent vandalism. The vertical spacing of the horizontal member shall be 1/2 inch. The completed egg -crate portion shall be 1- 1/2 inches deep. The material for the crate visor shall be as specified i n Subsection 733- 2.02(A)(6) of the specifications.
Each lamp socket for incandescent pedestrian signals shall be provided with one red lead for "Hand" symbol and one green lead for "Walking Man" and one white lead from the shell . Leads shall be number 18 AWG and shall be wired to respective terminals of a three -terminal block. The two white wires shall be connected to a common terminal. 733- 2.03 Flashing Beacons: Flashing beacons shall consist of one or two signal sections as designated on the project plans, conforming to the provisions in Subsection 733 -2.01(A) of the specifications. A yellow or red lens shall be used as specified on the project plans.
The overhead flashing beacon shall consist of two signal sections mounted on a cantilever arm assembly. Each overhead assembly shall incorporate 12- inch signal sections with yellow lenses unless otherwise specified. The "Signal Ahead" sign to be mounted on the mast arm will be furnished by the Department unless otherwise specified.
Each pole flasher shall consist of two signal sections. Each pole flasher assembly shall contain 8-inch signal sections with yellow lenses. TABLE OF CONTENTS INDEX 870
The control equipment housing shall be a Type I load center cabinet as shown in the plans unless otherwise specified. 733- 2.04 Mounting Assemblies: Mounting Assemblies shall consist of terminal compartments and assemblies of 1- 1/2 inch nominal standard pipe and fittings. All members shall be so fabricated that they shall provide plumb, symmetrically arranged, and securely fabricated assemblies. Terminal Compartments: A terminal compartment shall be assembled in the mounting brackets as shown in the Standard Drawings. The terminal compartment shall be manufactured of bronze, Type 356- T6 aluminum, or ductile iron. Each terminal compartment shall be fitted with a 12 -position, 24- terminal block. Each type of mounting assembly shal l be supplied with wiring from the terminal block through the support arm which holds the signal. This wiring shall be in the form of color -coded wire leads with spade terminals for connecting to signal head, and soldered ends for connecting to terminal strips in the terminal compartment. The wiring shall be colored -coded as follows: White Common to all heads Red Red lens head Yellow Yellow lens head Green Green lens head The leads shall be minimum number 16 stranded AWG Type- THW with 30-mil thermoplastic insulation. Leads shall be of sufficient length to extend from the center section of the signal head to the top of the terminal compartment. Terminal compartment wire hookup shall be as follows: Top terminal Phase A Red Next terminal Phase A Yellow Next terminal Phase A Green Next three terminals Phase B R -Y-G Bottom terminal Common - White
A rainproof cover shall be provided for all terminal compartments which will provide ready access to the internal terminal block wiring. The types of frameworks used and the methods of mounting them shall be as shown on the plans or specified in the Special Provisions. TABLE OF CONTENTS INDEX