DelDOT Standard Specifications Section 831: Conduit

831.1Description.

This work consists of providing and placing or removing conduit.

831.2Materials.

A.Conduit

1.Galvanized steel conduit Section 1062

2.High Density Polyethylene (HDPE) conduit Section 1062

3.Polyvinyl Chloride (PVC) conduit Section 1062

4.Flexible metallic-liquid tight conduit Section 1062

5.Nonmetallic belled end pole riser shield Section 1062

B.Conduit Hangers Section 1062

C.Pulling Rope Section 1062

D.Warning and Location Tape Section 1062

E.Conduit and Duct Sealant Section 1062

F.Borrow Section 1001

831.3Construction.

A.Install conduit in a straight line between terminal points whenever possible.

B.Space junction wells no more than 600-feet apart for fiber optic conduit.

C.Space junction wells no more than 250-feet apart for traffic signal and lighting conduit.

D.Use sweeping bends. Consult with the engineer before placing bends to obtain approval for the

proposed conduit arc.

E.Apply conduit sealant to the exposed ends of lighting conduit in pole bases, cabinet bases, junction

wells, and risers. Seal the conduit to provide a liquid tight connection. The Department will not require sealant for traffic signal or fiber optic conduit.

F.Provide a minimum cover of 24-inches and a maximum cover of 48-inches as measured from

finished grade.

G.Place a pull rope or tape in each conduit if not already pre-installed by the manufacturer. Dispose

of the pull rope after placing the cable in the conduit.

H.Use typical termination methods, for conduit not terminated to a base or junction well, as

required by the Standard Construction Details. Do not extend conduit into a junction well any more than 3-inches.

I.Place sealed end caps (with knockouts if empty) on the ends of all conduits after compressed air

has been used to clear all foreign matter 831.3.1 Galvanized Steel Conduit.

A.Cut, ream, and thread galvanized steel conduit using conduit tools.

B.Provide enough thread to ensure that the sections of conduits, when coupled together, will butt

together providing a watertight joint.

C.Use an approved 3-piece threaded union to join 2 threaded lengths of galvanized steel conduit

when a standard coupling will not work. Do not use a threaded union in a conduit run when placing conduit by the driven method. Do not use a threadless coupling or a split-bolt coupling for direct buried conduit. 831.3.2 HDPE-SDR 13.5 Conduit. Connect lengths of HDPE conduit with irreversible fusion couplings. Do not use mechanical or removable couplings. 831.3.3 PVC Schedule 80 Conduit

A.Cut and prepare the conduit using conduit tools.

B.Connect lengths of PVC conduit by inserting the normal end of one length of conduit into the

flared end of the adjoining length of conduit or use a coupling.

C.Seal all joints with epoxy to ensure that the 2 conduit pieces bond to one another to form a solid

waterproof link.

D.Use a coupler module where conduit segments do not align properly to allow the flared end of one

conduit segment to mate with the normal end of the other segment, if approved by the engineer. Place caps on the ends of conduits after using compressed air to clear debris from the conduit. 831.3.4 Directional Bore Installation.

A.Use the directional bore method to place conduit with a diameter of no less than 2-inches under

the existing pavement. Do not exceed the outside diameter of the conduit being installed by more than 1-inch. Pump cement grout into the void in cases where the directional bore exceeds the outside diameter by more than 1-inch.

B.Upon completion of the directional boring operation and conduit placement, uncover the forward

end of the conduit and use compressed air to clear debris before inspection. 831.3.5 Open Cut Installation.

A.Use the open cut installation method, when required by the contract, to place conduits with a

diameter no less than 2-inches under existing pavement. Obtain the engineer’s approval for open cutting roadways not shown as open cut in the contract. Remove cut pavement and replace the pavement after conduit installation.

B.Saw cut pavement in accordance with Section 762. Remove and dispose of cut pavement in

accordance with Sections 401 or 503. Remove pavement in accordance with the Standard Construction Details. The engineer will decide if the excavated material is suitable or unsuitable for backfill. Provide new backfill material, if the engineer decides the excavated material is unsuitable for backfill. Excavate to a depth in accordance with Section 831.3 and the contract. Place conduit and spare conduit in the trench and terminate in a junction well or base, in accordance with the Standard Construction Details.

C.Place backfill material in level lifts of loose material, no greater than 8 inches. Compact the lifts in

831.3.6 Unpaved Trench Installation.

A.Excavate to a depth in accordance with Section 831.3 and the contract. Install conduit in the

trench and terminate into a junction well or base in accordance with the Standard Construction Details.

B.Place backfill material in level lifts of loose material, no greater than 8 inches. Compact the lifts in

accordance with Section 207. Install underground warning tape over the conduit approximately 12-inches below the final grade. Compact the final lift of fill material to the planned final grade. Apply topsoil and seed t o the disturbed area in accordance with Section 908. 831.3.7 Conduit Installation on Structures. Install conduit on structures, in accordance with the contract, using approved conduit hangers and anchors. Drill anchors into concrete, brick, stone, steel, or wood, and attach the conduit hangers, spaced no more than 36-inches apart. Use sweeping bends to provide 90-degree turns in the conduit run. 831.3.8 Pole Riser Shields. Install nonmetallic pole riser shields on wood poles in a straight vertical line. Use an adapter if the nonmetallic pole riser is not the same size as the conduit the riser attaches to. Attach the riser shield to the pole with 1/4-inch x 1 1/2-inch galvanized lag bolts with washers. Install lag bolts spaced no more than 36-inches apart on both sides of the riser shield and in the topmost and bottom most set of slots. 831.3.9 Conduit Removal from Wood Poles. Remove conduit, straps, nails, or lag screws in a manner that does not damage or disturb other conduits on the pole. Dispose of materials in accordance with Section 106.8.

831.4Method of Measurement.

A.The Department will measure the quantity of galvanized steel, HDPE, PVC, or flexible metallic

liquid tight conduit, and nonmetallic pole riser shields as the number of linear feet provided, placed, and accepted.

B.The Department will measure the length of conduit installed under existing pavement by

directional bore along the path of the bore from the point where it is not possible to trench to a point where trenching can resume.

C.The Department will measure the length of conduit installed in open cut pavement, unpaved

trench, on wood poles, and on structures along the conduit.

D.The Department will measure the quantity of conduit removed from a wood pole as the number

of linear feet of conduit removed.

831.5Basis of Payment.

A.The Department will pay the quantity of conduit provided and placed at the contract unit price per

linear foot for the pay items listed below. Price and payment constitute full compensation for providing and placing conduit, backfill and backfilling, and duct sealant.

B.The Department will pay for topsoil and seeding in accordance with Section 908.

C.The Department will pay for restoring pavement in accordance with Sections 401 or 503.

D.The Department will pay for saw cutting in accordance with Section 762.

E.The Department will pay for the quantity of conduit removed from wood poles at the contract

unit price per linear foot for the pay items listed below. Price and payment constitute full

compensation for removing conduits and attachment hardware and disposing of removed materials. ITEM DESCRIPTION UNIT 831001 PROVIDE AND INSTALL UP TO 3” FLEXIBLE METALLIC-LIQUID TIGHT CONDUIT LF 831002 PROVIDE AND INSTALL UP TO 4” SCHEDULE 80 HDPE CONDUIT (BORE) LF 831003 PROVIDE AND INSTALL UP TO 4” SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831004 PROVIDE AND INSTALL UP TO 4” SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831005 PROVIDE AND INSTALL UP TO 4” SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831006 PROVIDE AND INSTALL UP TO 4” GALVANIZED STEEL CONDUIT (TRENCH) LF 831007 PROVIDE AND INSTALL UP TO 4” GALVANIZED STEEL CONDUIT (BORE) LF 831008 PROVIDE AND INSTALL UP TO 4” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831009 PROVIDE AND INSTALL UP TO 4” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831010 PROVIDE AND INSTALL UP TO 4” NONMETALLIC POLE RISER SHIELD LF 831011 REMOVAL OF CONDUIT FROM WOOD POLE LF 831012 PROVIDE AND INSTALL UP TO 6” SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831013 PROVIDE AND INSTALL 4" SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831014 PROVIDE AND INSTALL 3" SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831015 PROVIDE AND INSTALL 2 1/2" SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831016 PROVIDE AND INSTALL 2" SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831017 PROVIDE AND INSTALL 1" SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831018 PROVIDE AND INSTALL 1” FLEXIBLE METALLIC LIQUIDTIGHT CONDUIT LF 831019 PROVIDE AND INSTALL 2” FLEXIBLE METALLIC LIQUIDTIGHT CONDUIT LF 831020 PROVIDE AND INSTALL 3” FLEXIBLE METALLIC LIQUIDTIGHT CONDUIT LF 831021 PROVIDE AND INSTALL 4” FLEXIBLE METALLIC LIQUIDTIGHT CONDUIT LF 831022 PROVIDE AND INSTALL 1" SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831023 PROVIDE AND INSTALL 2" SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831024 PROVIDE AND INSTALL 2 1/2" SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831025 PROVIDE AND INSTALL 3" SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831026 PROVIDE AND INSTALL 4" SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831027 PROVIDE AND INSTALL 1" SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831028 PROVIDE AND INSTALL 2" SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831029 PROVIDE AND INSTALL 2 1/2" SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831030 PROVIDE AND INSTALL 3" SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831031 PROVIDE AND INSTALL 4" SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831032 PROVIDE AND INSTALL 1” GALVANIZED STEEL CONDUIT (TRENCH) LF 831033 PROVIDE AND INSTALL 2” GALVANIZED STEEL CONDUIT (TRENCH) LF

ITEM DESCRIPTION UNIT 831034 PROVIDE AND INSTALL 2 1/2” GALVANIZED STEEL CONDUIT (TRENCH) LF 831035 PROVIDE AND INSTALL 3” GALVANIZED STEEL CONDUIT (TRENCH) LF 831036 PROVIDE AND INSTALL 4” GALVANIZED STEEL CONDUIT (TRENCH) LF 831037 PROVIDE AND INSTALL 1” GALVANIZED STEEL CONDUIT (BORE) LF 831038 PROVIDE AND INSTALL 2” GALVANIZED STEEL CONDUIT (BORE) LF 831039 PROVIDE AND INSTALL 2 1/2” GALVANIZED STEEL CONDUIT (BORE) LF 831040 PROVIDE AND INSTALL 3” GALVANIZED STEEL CONDUIT (BORE) LF 831041 PROVIDE AND INSTALL 4” GALVANIZED STEEL CONDUIT (BORE) LF 831042 PROVIDE AND INSTALL 1” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831043 PROVIDE AND INSTALL 2” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831044 PROVIDE AND INSTALL 2 1/2” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831045 PROVIDE AND INSTALL 3” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831046 PROVIDE AND INSTALL 4” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831047 PROVIDE AND INSTALL 1” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831048 PROVIDE AND INSTALL 2” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831049 PROVIDE AND INSTALL 2 1/2” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831050 PROVIDE AND INSTALL 3” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831051 PROVIDE AND INSTALL 4” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831052 PROVIDE AND INSTALL 2” HDPE SDR 13.5 CONDUIT (BORE) LF 831053 PROVIDE AND INSTALL 2 1/2” HDPE SDR 13.5 CONDUIT (BORE) LF 831054 PROVIDE AND INSTALL 3” HDPE SDR 13.5 CONDUIT (BORE) LF 831055 PROVIDE AND INSTALL 4” HDPE SDR 13.5 CONDUIT (BORE) LF 831056 PROVIDE AND INSTALL UP TO 4” SCHEDULE 80 PVC CONDUIT (OPEN CUT) LF 831057 PROVIDE AND INSTALL 1 1/2” SCHEDULE 80 PVC CONDUIT (TRENCH) LF 831058 PROVIDE AND INSTALL 1 1/2” SCHEDULE 80 PVC CONDUIT (ON STRUCTURE) LF 831059 PROVIDE AND INSTALL 1 1/2” GALVANIZED STEEL CONDUIT (OPEN CUT) LF 831060 PROVIDE AND INSTALL 1 1/2” GALVANIZED STEEL CONDUIT (TRENCH) LF 831061 PROVIDE AND INSTALL 1 1/2” GALVANIZED STEEL CONDUIT (BORE) LF 831062 PROVIDE AND INSTALL 1 1/2” GALVANIZED STEEL CONDUIT (ON STRUCTURE) LF 831063 PROVIDE & INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF 831064 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1 1/2" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF 831065 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF

ITEM DESCRIPTION UNIT 831066 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2 1/2" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF 831067 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 3" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF 831068 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 4" SCHEDULE 80 PVC CONDUITS IN TRENCH OR OPEN CUT LF 831069 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2" HDPE 13.5 SDR CONDUIT IN DIRECTIONAL BORE LF 831070 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2 1/2" HDPE 13.5 SDR CONDUIT IN DIRECTIONAL BORE LF 831071 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 3" HDPE 13.5 SDR CONDUIT IN DIRECTIONAL BORE LF 831072 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 4" HDPE 13.5 SDR CONDUIT IN DIRECTIONAL BORE LF 831073 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831074 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1 1/2" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831075 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831076 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2 1/2" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831077 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 3" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831078 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 4" GALVANIZED STEEL CONDUIT IN TRENCH OR OPEN CUT LF 831079 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1" STEEL CONDUIT IN DIRECTIONAL BORE LF 831080 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 1 1/2" STEEL CONDUIT IN DIRECTIONAL BORE LF 831081 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2" STEEL CONDUIT IN DIRECTIONAL BORE LF 831082 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 2 1/2" STEEL CONDUIT IN DIRECTIONAL BORE LF 831083 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 3" STEEL CONDUIT IN DIRECTIONAL BORE LF 831084 PROVIDE AND INSTALL SECOND AND SUBSEQUENT ADDITIONAL 4" STEEL CONDUIT IN DIRECTIONAL BORE LF

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Source: Delaware Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 489–0 of 786. View official source ↗

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830 CONDUIT JUNCTION WELLS

832 ELECTRIC AND ITMS CABLE AND SPLICING

831CONDUIT

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