385 SECTION 770
770.01 Description
This work consists of furnishing and installing highway lighting.
770.02 Equipment
Reserved.
770.03 Materials
A.General. Item Section Concrete, Class AE -3 802 Rapid -Hardening Cementitious Materials 806.01 Galvanizing 854 Highway Lighting 895
B.Work Drawings. Submit work drawings a maximum of 50 days after the date of award of contract. With the work drawings, provide the dimensions, type of material, and the functional characteristics of the equipment to be installed. Submit work drawings for the following items:
1.Conductors;
2.Pull Box;
3.Feed Point Equipment including:
a.Circuit breakers (enclosed in a load center -type panel board);
b.Enclosed relay (normally open);
c.Cabinet; and
d.Photoelectric cell.
4.Light Standard including:
a.Luminaire;
b.Fuseholder; and
c.All necessary calculations and drawings used in the design of the light standard.
5.Sign Lighting Fixture including:
a.Loadcenter;
b.Luminaire; and
c.Ballast.
6.High Mast Lighting Assembly including: a. Pole;
b.Lowering Device;
c.Head Frame Assembly;
d.Luminaire Ring Assembly;
e.Winch and Hoisting Assembly including all cables;
f.Portable Power Unit; 386 g. Luminaires; and
h.All necessary calculations and drawings used in designin g high mast lighting assembly.
C.Manuals. Furnish 2 operating and maintenance manuals for the high mast equipment in loose-leaf, hard-covered binders that contain: - proper indexes and tables of contents; - operating procedures; - recommended maintenance schedules; - manufacturer and catalog numbers of electrical components; - equipment parts numbers; - copies of all reviewed work drawings; - spare parts lists; and - lubrication charts Place one operating and maintenance manual in the feed point cabinet and submit one to the Engineer.
770.04 Construction Requirements
A.General. All electrical installations must be either performed by or supervised by a licensed electrician. Perform all work to meet the requirements of the National Electrical Code, the North Dakota State Electrical Board, the local utility company, and the ordinances established by the local municipality. Provide and bear all costs for the electrical service necessary to operate and maintain the lighting system until the system is accepted as specified in Section 770.04 P.2, “Acceptance” .
B.Cable Trench. Immediately backfill using the excavated material. Compact the backfill material using the same density requirements as the adjacent material. Street lighting multiple underground cable may be installed by the plowing method.
C.Concrete Foundation. Cast concrete foundations in place. Place the concrete in one continuous operation with no construction joints. Consolidate the concrete according to Section 602.04 C.2 “Vibration”. Allow the concrete foundation to cure for 7 days before placing poles on the foundation. Do not grout between the foundation and the pole base. Install anchor bolts according to Section 754.04 D.5.b, “Anchor Bolt Installation”.
D.Conduit.
1.General. Provide smooth and rounded inner edges of joints and the extreme ends of conduit. Do not use slip joints or running threads for conduit couplings. If a standard coupling cannot 387 be used, use an approved threaded union. Rotate coupling components until ends of conduit are brought together. Use a single type of material throughout a conduit run. Install conduit a minimum of 24 inches below the surface. Bore or jack conduit under the roadway. Install conduit in other areas by trenching, boring, or jacking. D o not jack non-metallic conduit. Fill abandoned bore areas within the roadbed with grout. Immediately backfill using the excavated material. Compact the backfill material to the same density as the adjacent material. Install conduit runs terminating in c oncrete foundations a minimum of 2 inches above the finished grade of the foundation. Install conduit runs terminating in concrete pull boxes 2 inches beyond the inside wall of the box and a minimum of 2 inches above the bottom. Install conduit into foundations and pull boxes on the face of the object nearest to the conduit run. When field bending conduit, produce bends without crimping or flattening the conduit and construct the inside radius of the bend equal to at least six times the nominal diameter of the conduit. If light standard foundations are installed and there is not a continuous run of conduit, install conduit in the concrete foundation that is a minimum of 2 inch diameter and use rigid conduit elbows. Seal conduit ends with steel wool immediately after installation and reinstall after each phase of construction. Install conduit plugs in each conduit end after the conductor is installed. Provide conduit plugs which create an air and water tight seal, and are removable and reusable. Pr ovide plugs that can be split to permit installation or removal of the plugs without removing the conductor. Provide conduit plugs that seal using an adjustable filler of neoprene or silicone rubber compressed with stainless steel hardware. Install duct seal on all conduits containing cables at controller cabinets, traffic signal bases, and pull boxes.
2.Metallic Conduit. Fit the terminal ends of metallic conduit with a grounding bushing before installing the conductor. When constructing joints, paint metallic conduit end threads with pipe joint compound and thread them into couplings. Paint, bushings, exposed threads, and scuffed areas with rust-preventative paint.
3.Nonmetallic Conduits. Paint plastic conduit ends with a solvent weld, as recommended by the conduit manufacturer, before inserting them into couplings.
4.HDPE. Install conduit when the conduit temperature and the ambient temperature is greater than minus 10°F.
E.Conductors.
1.General.
a.Pull all conductors through conduit by hand without causing strain to the conductors or conduit.
b.If splicing, place splices in light standard bases or feed points. Use compression type splices.
c.Install additional conductor length to provide for sl ack and the wiring of feed points and light standards as follows:
1.Ten feet at the feed point;
2.Four feet at each foundation for each incoming and outgoing circuit;
3.Three feet of slack for each single conductor installed in cable trench at each light standard foundation for each incoming and outgoing circuit. Install this extra conductor in a series of “S” curves in the trench. This does not apply to multiple conductor cable; and
4.Six feet at pull boxes where connections are made.
d.Connect c onductor with sufficient slack to prevent any strain on the conductor or connections.
e.Ground bases, light standards, control cabinets, feed points, and exposed metal parts. Install bolted pressure connectors on all ground rods.
f.After the conductor is installed, protect the conductor from moisture until the light standard is installed.
g.Identify the function of each conductor and label each conductor accordingly.
2.Highway Lighting Circuits.
a.Install each lighting circuit in a separate trench.
b.Where one lighting circuit crosses another, place a minimum 4 inch bed of sand between the circuits at the point of crossing. Circuits installed by plowing do not require a sand bed.
c.Loop the continuous grounding conductor (not a neutral) through each foundation and feed point. Connect the continuous grounding conductor to the light standard and feed point cabinet.
d.Provide sufficient length of internal light standard conductor so the fuse kit can be withdrawn from the standard through the hand hole. 389 F. Feed Point. Install the complete feed point including the cabinet, padlock, conduit, conductor, service entrance heads, meter sockets, and ground rods. The local utility company will furnish and install the required single phase voltage service connection and any required meter. Coordinate with the local utility company for the service connection. Lock and seal any switch box as required by the utility company or local governmental agency.
G.Light Standards. Plumb the light standard with leveling nuts. Adjust the leveling nuts on assembled light standards before 10:00 am. Tighten anchor nuts according to Section 754.04 D.5.c “Anchor Bolt Tightening” . Install the mast arms perpendicular to the roadway centerline. Place the light standards to provide the greater minimum horizontal and vertical clearances to power lines required by the NEC or the power line voltages shown in Table 770-01. Table 770 -01 Power Line Voltage (kV) Horizontal Clearance Vertical Clearance 0 - 22 5 ft 6 ft Greater than 22 5 ft + 0.033 ft per kV greater than 22 kV 6 ft + 0.033 ft per kV greater than 22 kV Tighten the anchor bolts securely. Install nuts so a minimum of two threads are exposed above the nuts. Torque bolts in a multi -directional slip base as specified by the manufacturer. Install rodent protection using wire with a maximum size opening of ¼ inch for all light and transformer base installation. Place the wire mesh continu ously around the anchor bolts to prevent rodents from entering the base through the space between the foundation and the lower plate of the light standard. Secure the mesh to the anchor bolts. Install the screen the same day as the light standard is instal led.
H.Street and Sign Lighting Luminaires. Insert a plug of oakum in the luminaire wire entrance. Place the fuse assembly for each street light luminaire in the light standard base.
I.High Mast Lighting Assembly Installation. Submit the manufacturer’s installation and assembly instructions showing the assembly sequence, lift point, and erection pro cedure with suggested equipment for installation. Submit a check list of all parts identifiable by structure type and number. Shop blast the high mast lighting assembly according to the Steel Structures Painting Council Surface Preparation Specification “ No. 6 Commercial Blast Cleaning,” SSPC -SP6. Provide an outer surface that is conducive to uniform weathering. Do not place markings directly on the surface of the assembly. Immediately before erection, clean the surface of the assembly with water. Align the luminaire to light the intended area.
J.High-Pressure Sodium Vapor Wall-Mounted Luminaire. Install the mounting bolts using a threaded insert. Attach the wall -mounted luminaire by a minimum of three 1/4 inch diameter bolts. Install the fuse assembly for each luminaire in the junction box.
K.High-Pressure Sodium Vapor Under pass Ceiling-Mounted Luminaire. Insert the mounting bolts using a threaded insert. Attach the ceiling-mounted luminaire by a minimum of four 1/4 inch diameter bolts. Install the fuse assembly for each luminaire in the junction box.
L.Sign Lighting. Install ground rods and conductor for sign lighting systems.
M.Remove Existing Lighting Equipment. Before work begins, contact the local utility company and arrange a time for the power to be disconnected. The local utility company will remove the meter. Remove existing foundations to a minimum depth of 3 feet below the ground line. Restore the surface to match adjacent areas. If the plans designate the lighting equipment as salvage, disconnect the luminaire receptacle wires at the fuses and remove the luminaire from the mast arm before storing the equipment. If the plans designate the lighting equipment as salvage, deliver the switch box and meter trim from the feed point to the designated salvage area.
N.Relocate Light Standard. Disconnect the wires to the luminaire at the fuses. Remove the light standard as specified in Section 770.04 M, “Remove Existing Lighting Equipment” . Install the light standard in the new location as specified in Section 770.04 G, “Light Standards” . Paint relocated light standards with one coat of aluminum paint. Apply the paint as specified in Section 770.04 O.2, “Application” .
O.Painting.
1.Materials. Paint feed point cabinets with two coats of exterior enamel meeting Section 852.01 C, “Enamels” . Paint the base and lower 12 feet of light standards with attached pedestrian signal heads as specified in Section 772.04 M, “Signal Painting” .
2.Application. Sandblast surfaces that require preparation. Feather and clean existing paint remaining along the edges of blast cleaned areas to ensure a bond of new to old paint. Apply paint only when the air temperature is at or above 45°F and below 100°F. Do not apply paint when there is precipitation or when the wind will cause accumulation of blown material in the wet paint. Brush or spray apply paint. If using spraying equipment, use airless spraying equipment and continuously agitate the paint during the spraying operation. Apply paint to be smooth and uniform without skips or areas of excessive paint. Allow the previously applied coat of paint to dry before applying the next coat. Protect adjacent property from drift by using protective shields. Prevent dust and dirt from coming in contact with the freshl y painted surfaces. Touch up painted areas that become scratched or marred with matching paint after erection.
P.Tests and Acceptance.
1.Tests. After the installation is complete and at the time designated by the Engineer, the Engineer will conduct the operating test. Furnish instruments and personnel required for all tests, record all test results, and be present during all tests and inspections. The Engineer may hold nighttime tests and inspections.
2.Acceptance. Upon completion of the lighting system operating tests, put the lighting system into service. The lighting system will be accepted after 90 consecutive days of service without malfunction. If a malfunction occurs, submit a written report detailing the malfunction and the measur es taken to correct the malfunction. The Engineer will perform the lighting inspection after this period.
770.05 Method of Measurement
The Engineer will measure, completed and in place, as specified in Section 109.01, “Measurement of Quantities” and as follows: The Engineer will not measure conduit that is placed in concrete foundations, in feed points, on overhead, and on bridge sign structures. The Engineer will include the additional conductor lengths in the measurement of the conductor.
770.06 Basis of Payment
Pay Item Pay Unit Cable Trench Linear Foot Concrete Foundation Each Conduit ____ Size Linear Foot Multiple Underground Cable ____ Size Linear Foot Underground Conductor ____ Size Linear Foot 392 Pay Item Pay Unit Feed Point -Type __ - __ Mounted Each Lighting Standard Each High Mast Lighting Assembly Each Lighting Standard Extension Each Street Lighting Luminaire Each Bridge Sign Lighting Each Overhead Sign Lighting Each High-Pressure Sodium Vapor Wall -Mounted Luminaire Each High-Pressure Sodium Vapor Underpass Ceiling -Mounted Luminaire Each Relocate Light Standard Each Remove Light Standard Each Remove Feed Point Each Revise Concrete Foundation Each Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 772 393 SECTION 772 HIGHWAY TRAFFIC SIGNALS
772.01 Description
This work consists of furnishing and installing flashing beacons and traffic signals.
772.02 Equipment
Item Section Air Compressor 156.01
772.03 Materials
A.General. Item Section Concrete, Class AE 802 Rapid -Hardening Cementitious Materials 806.01 Galvanizi ng 854 Highway Traffic Signals 896 The Department defines words and phrases as defined in Section 1 “Definitions” of the NEMA Standard Publication No. TS 2 Traffic Control Assemblies with NTCIP Requirements and Part 1 “Definitions” of NEMA Standards Publication TS -1 Traffic Control Systems to interpret these Specifications .
B.Work Drawings. Submit work drawings a maximum of 50 days after the date of award of contract. Provide the following with the work drawings, provide: − The dimensions; − Type of material; − The functional characteristics of the equipment to be installed; and − Any manufacturer warranties and guarantees listing the Department as the owner. Submit work drawings for the following listed items:
1.Conductors;
2.Pull Box;
3.Saw Slot Sealant;
4.Feed Point Equipment including:
a.Safety switch and lightning protection device;
b.Flasher;
c.Time Clock; and
d.Cabinet.
5.Traffic Signal Standards including all necessary calculations and drawings used in designing these poles;
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 420–427 of 550.