- 926 - SECTION 1072 -- REFLECTORS
1072.01 Description
1.Authorized reflectors are described in this Section.
1072.02 Material Characteristics
1.The reflector shall consist of a round retroreflecting lens permanently bonded and hermetically sealed to its back.
2.The back may be either acrylic plastic or metal foil. a. The foil back reflectors must have a minimum of 0.018 inch (0.46 mm) thick alum inum housing.
b.The acrylic plastic back reflectors do not require an aluminum housing.
3.The reflector shall have a mount ing hole in the center with a diameter of not less than 3/16 inch (5 mm).
4.The reflector shall have a visible reflective area of not less than 6.5 square inches (4200 mm
2.when mounted.
5.The lens shall consist of a smooth front surface free from projections or indentations other than the central mounting hole and manufacturer's identification.
6.The rear surface shall be a pris matic configuration such that it will cause total internal reflection of light.
7.The prism arrangement in the lens shall be su ch that the lens will have a segmented appearance with at least 2 and not more than 6 segments in each unit.
8.The unit shall be permanently sealed against dust, water, and water vapor.
9.Fasteners for delineators sha ll be at least 3/16 inch (5 mm) diameter pan or round head machine scr ews (length shown in the contract) conforming to the requirements of ASTM F 568.
1072.03 Specific Intensity
1.The reflectors shall meet specif ic intensity requirements shown in Table 1072.01. Table 1072.01 Reflector Requirements Observation Angle, (degrees) Entrance Angle, (degrees) Minimum Specific Intensity (Candlepower per foot-candle) (Candela per lux) White Yellow Red Blue 0.1 0 120 (11.1) 72 (6.7) 30 (2.8) 12 (1.1) 0.1 20 48 (4.5) 29 (2.7) 12 (1.1) 4.8 (0.4) 0.33 0 20 (1.9) 12 (1.1) 5 (0.5) 2.0 (0.2) 0.33 20 8 (0.7) 5 (0.5) 2 (0.2) 0.8 (0.08)
2.Failure to meet the minimum specific intensity requirements of more than two reflectors out of the 53 subjected to testing shall constitute failure of the lot. Reflectors 1072.08 - 927 - 1072.04 -- Color
1.The color of the reflectors shall be white, yellow, red, or blue by day and when viewed by reflected light at night.
2.The color of the reflectors shall not fade during exposure. 3. The initial color of the reflec tors shall be determined by use of a colorimeter and the tristimulus method to obtain x and y chromaticity coordinates.
4.The lens color shall be accordi ng to requirements of the contract.
1072.05 Packaging and Delivery
1.The reflector shall be furnished as a completely assembled unit ready for mounting.
2.The reflector shall be packaged in such a manner as to insure their arrival at the destination in an undamaged condition.
1072.06 General
1.Round Center-Mount Reflex-R eflectors for Delineators shall conform to the material and design r equirements of this Specification.
2.For acceptance purposes, a samp le of 53 units from each lot will be tested for optical and durability tests.
1072.07 Tests
1.The reflectors will be tested according to Table 1072.02. Table 1072.02 Test Test Method Specific Intensity NDOT T257 Seal NDOT M290 Heat Resistance NDOT M290
1072.08 Acceptance Requirements
1.Acceptable reflectors are shown on the Department’s Approved Products List.
2.Fasteners for delineators refer to Section 1071. - 928 - SECTION 1073 -- ROADWAY LIGHTING, SIGN LIGHTING, AND TRAFFIC SIGNALS
1073.01 Description
1.This Section describes material requirements for roadway lighting, sign lighting, and traffic signals.
1073.02 Material Characteristics
1.General Requirements:
a.All materials shall be new. Used or reconditioned equipment is not acceptable.
b.Materials scheduled for use on the project must be approved by the Engineer before they can be installed.
c.(1) The Contractor shall be prepared to furnish, upon request, a sample of any item or material t hat he/she proposes to furnish. Unless destructive testing is required, the sample will be returned.
2.All costs related to the furnishing of samples, including all shipping and testing costs, shall be included in the contract bid price.
d.Review of shop drawings by the Engineer is for the purpose of checking for general conformance with the design concept of the project and for general compliance with the contract documents only. Any action taken by the Engineer on submittals and shop drawings will not relieve the Contractor of the responsibility to provide satisfactory materials and equipment meeting the requirement s of the contract documents.
e.If errors in shop drawings are not detected by the Engineer, the Contractor is not relieved of his/her re sponsibility to comply with the contract documents; and the Engineer's review of the shop drawings shall never be construed to allow the Contractor to proceed in error.
f.At the time of each submittal, the Contractor shall, in writing, call the Engineer's attention to any deviations that the shop drawings or samples may have from the require ments of the contract documents.
2.Ground Rods: a. Ground rods shall, with the exception of length and diameter, be in compliance with IMSA Specifications and be installed in accordance with the National Electric Code . Ground rods used in traffic signal installations shall extend through the foundation and at least 7 feet (2.1 m) into the ground with 5 inches (125 mm) extending above the foundation. Ground rods shall have a minimum diam eter of 5/8 inch (13 mm). Ground rods shall be supplied with a ground rod clamp.
b.Ground rods used in roadway lighting installations shall comply with ANSI/UL 467 (ANSI C 33.8 and CSA) and IMSA Specifications and be installed in accordance with the National Electric Code and the contract.
c.Grounding Clamps and connectors shall be UL approved for the material being grounded and the grounding method being used.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 960–961 of 1,048.