739.01 Electrical Conductors
786 SECTION 738 ELECTRICAL CONDUCTORS
738.01 Traffic Signal Wire and Cable
Provide traffic and signal electrical cable in accordance with IMSA 19-1 or 20 -1, size 14 AWG. Provide shielded loop detector lead -in cable in accordance with IMSA 50-2, size 14 AWG. Provide loop detector wire in accor dance with IMSA 51-5, size 14 AWG.
738.02 Building and Highway Lighting Wire and C Able
Provide AWG sized NEC wire, Type XHHW -2 or Type THHN building wire and cable with copper conductors, rated for 600 V. Provide AWG sized NEC wire, Type XXHW -2 or Type TTHN underground wire and cable with copper conductors. Provide AWG sized NEC wire, Type XHHW -2 or Type THHN aerial wire and cable with a conductor material that is best suited for the service intended.
738.03 Communication Wire A Nd Cable
Provide underground communication wire and cables in accordance with IMSA 20-2 or REA -22. Provide overhead communication wire and cable in accordance with IMSA 20-4.
739.01 Precast Concrete Pul L Boxes
A.Concrete Prov ide concrete mixture designed to have a compressive strength of 3,000 psi [20.7 MPa] in accordance with AASHTO T 22.
B.Reinforcement Provide wire reinforcement in accordance with AASHTO M 32 or AASHTO M 225.
C.Cover Provide a gray iron casting cover in a ccordance with Subsection 725.03, “Iron Castings.” Ensure the cover has a non -slip surface and two, ⅜ in [9.5 mm] pent head brass bolts and nuts. PULL BOXES 739.02 787 739.02 PRECAST REINFORCED P LASTIC PULL BOXES
A.General Provide reinforc ed plastic mortar composed of a borosilicate glass fiber in the form of woven fabric, chopped strand or mat, catalyzed polyester resin, and aggregate.
B.Plastic Material Provide self -extinguishing plastic materials tested in accordance with ASTM D635. En sure the plastic material does not physically change when exposed to weather.
C.Design Characteristics Provide a cover with an embossed nonskid surface equipped with two, ⅜ in [9.5 mm] pent head brass bolts and nuts. Provide a concrete gray colored box and cover. Ensure deflections from test loads do not cause the cover to bind or become displaced from the extension.
1.Cover Ensure the cover can withstand the following: A weight of 5,000 lb [2,268 kg] distributed over a 10 in × 10 in [254 mm × 254 mm] area without puncture or splitting; and An impact load of 75 ft•lb [101.6 Ncm] from a 12 lb [5.44 kg] mass with a tup -C nose detail in accordance with ASTM D2444.
2.Box Walls With the cover in place, ensure box walls can withstand a 5,000 lb [2,268 kg] v ertical load distributed over a 10 in × 10 in [254 mm × 254 mm] area centered over an exposed edge.
3.Lateral Loads Without the cover, ensure lateral loads can withstand 5,000 lb [2,268 kg] distributed over a 10 in × 10 in [254 mm × 254 mm] area of backf ill adjacent to the installed box.
740.02 Traffic Signal Backplates
788 SECTION 740 TRAFFIC SIGNAL BACKPLATES
740.01 Materials
Provide vacuum -formed backplates constructed of polycarbonate or Acrylonitrile -Butadiene -Styrene (ABS) sheet mate rial. Provide polycarbonate sheet material in accordance with ASTM D638, D695, D790, and D1822. Provide ABS sheet material in accordance with ASTM D 1788. Provide aluminum sheet material in accordance with ASTM B209. Provide Type IX or Type XI retroreflect ive sheeting in accordance with ASTM D 4956.
740.02 Finish
Ensure the backplate is black with a hair cell finish on the front and a smooth finish on the back.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 800–801 of 935.