ITS Conduit ITS CONDUIT
Part 1 — General
1.1 Section Includes
A.ITS conduit for commun ications and fiber optic cables .
B.Detectable pull tape, conduit, and all materials, labor, workmanship, equipment, and incidental items required for a complete system of conduit.
1.2 Related Sections
A.Section 02056: Embankment, Borrow, and Backfill
B.Section 02221: Remove Structure and Obstruction
C.Section 02705: Pavement Cutting
D.Secti on 02741: Asphalt Mix
E.Section 02776: Concrete Flatwork
F.Section 02842: Delineators
G.Section 03575: Flowable Fill
1.3 References
A.ASTM D 2241: Poly -Vinyl Chloride (PVC) Pressure -Rated Pipe (SDR Series)
B.ASTM F 2160: Solid Wall High Density Polyethylene (HDPE) Conduit based on Controlled Outside Diameter (OD).
C.National Electrical Code (NEC)
D.National Electrical Manufacturers Association (NEMA)
E.State of Utah Administrative Rules
F.Underwriters Laboratories (UL) ITS Conduit
1.4 DEFINITIONS Not Used
1.5 Submittals
A.Manufacturer’s product data sheets and recommended installation instructions.
B.Manufacturer’s warranties and parts lists
C.Conduit Mandrel Test Form prior to substantial completion.
D.Refer to http://www.udot.utah.gov/go/standardsreferences for blank forms for this Section.
Part 2 — Products
2.1 Materials
A.Conduit and fittings for ITS communication and fiber optic c onduit
1.Schedule 40 PVC rated at 194 degrees F as specified in NEMA TC-2, NEMA TC -3, ASTM D 2241,
2.High Density Polyethylene (HDPE ) SDR11 rated complying with ASTM F 2160.
a.HDPE conduit with smooth outer wall and ribbed or smooth interior wall.
b.Fittings and couplers rated for a minimum of 130 psi.
c.Mechanical type couplers when joining HDPE and PVC conduits.
3.Microduct
a.HDPE microduct with an outside/inside diameter of 0.500/0.394 inch (12.7 /10 mm) or 0.630/0.512 inch (16/13 mm) or 0.709/0.551 (18/14 mm) , as shown.
b.Microduct having a ribbed interior.
c.Watertight couplers rated for a minimum of 200 psi.
d.Microduct bundle within a single 0. 100 inch thick polyethylene oversheath.
e.Microduct bundles must contain a factory installed #14 AWG solid, insulated locate wire and a minimum of two rip cords for removal of oversheath.
B.Conduit Banks
1.New, prefabricated
2.ITS Multi -duct Conduit Types
a.1D = four 1.25 -inch conduits
b.2D = eight 1.25- inch conduits ITS Conduit
c.4D = sixteen 1.25- inch conduits
3.Color -code each conduit or cell as follows:
a.One, two, or three conduits gray
b.1D Bank 1 blue, orange, green and brown
c.2D Bank 1 blue, orange, green, and brown Bank 2 slate, white, red, and black
d.4D Bank 1 blue, orange, green, and brown Bank 2 slate, white, red, and black Bank 3 same as bank 1 with a contrasting stripe Bank 4 same as bank 2 with a contrasting stripe
4.Microduct types:
a.Individual 0.500/0.394 inch (12.7 /10 mm) or 0.630/0.512 inch (16/13 mm) microducts installed loosely within new or existing conduit.
b.MD2, MD3, MD4 and MD7: microduct bundle containing two, three, four or seven 0. 709/0.551 inch (18/14 mm) microducts respectively.
c.Factory -assembled bundles for bundled applications.
5.Color -code microducts and oversheaths as follows:
a.Individual microducts installed loosely within conduit or bundled within oversheath: 1) blue 2) orange 3) green 4) brown 5) slate 6) white 7) red 8) black
b.Oversheaths: Bundle #1 blue Bundle #2 orange Bundle #3 green Bundle #4 brown
C.Meet or exceed all of the conduit manufacturer’s recommendations for materials used in the installation of conduits including sweeps, adapters, couplings, glue, plugs, and fittings.
1.Conduit plugs must seal the conduit and allow the secure fastening of detectable pull tape.
D.PVC conduit sections – Nominal 20 ft sections . Couplings and fittings must provide watertight integrity.
E.Sweeps – factory manufactured sweeps (11¼, 22½, 45, and 90 degree angles) complete with bell and spigot. ITS Conduit
F.Detectable Pull Tape – flat profile, low stretch polyester, detectable, sequential footage marked, 1,200 lb tensile strength pull tape i n each conduit.
G.Backfill 1. Flowable Fill – Refer to Section 03575.
2.Free Draining Granular Backfill – Refer to Section 02056 .
3.Sand
a.Friable natural river or bank aggregate, free of loam, detrimental, or soluble or organic matter. b. 3/8 inch minus, well graded.
4.Hand- mix grout
a.Minimum strength – 50 psi
b.Maximum strength – 150 psi
c.Slump – 5 inches to 10 inches
H.Rigid Metal Conduit (RMC) complying with UL -6. Zinc galvanized exterior coating complying with ANSI C80.1 .
I.Liquidtight Flexible Metal Conduit (LFMC), - 30 degrees C to 80 degrees C rated, UL 360 listed.
J.Liquidtight Flexible Nonmetallic Conduit (LFNC), 80 degrees C dry, 60 degrees C wet rated, sunlight resistant, UL 1660 listed.
Part 3 — Execution
3.1 General
A.Maximum spacing between junction boxes and vaults
1.500 ft for electrical cable.
2.1,000 ft for fiber optic cable on tangent surface street installations .
3.2,500 ft for fiber optic cable on tangent highway installations .
4.Reduce maximum spacing if horizontal or vertical deflection incurred during installation prevents the installation of cable within maximum pulling tension rating of the cable.
5.Notify the Engineer if utility avoidance requires junction box and conduit locations differing from requirements for deflection in th is Section, a rticle 3.2. ITS Conduit
B.Minimum Cover of Conduit
1.Minimum cover under pavement is 4ft and minimum cover under sidewalks is 3 ft.
2.Minimum cover in highway right -of-way, greater than 20 ft from the edge of the pavement is 3 ft.
3.Minimum cover in highway right -of-way, within 20 ft of the edge of the pavement is 5 ft.
4.Refer to State of Utah Administrative Rule 930- 7
3.2 Installation
A.Prevent conduit from deflecting vertically or horizontally along its length by a ratio greater than 10:1, (no more than 4- inch deflection per 40 inch in length) when installing conduit that houses communication cable.
B.Prevent sum total of the vertical and horizontal conduit deflection or bend between any two junction boxes from exceed ing 270 degrees when installing conduit.
C.Install conduit within 1 ft of existing parallel conduit run if the planned location of conduit is parallel to the existing traffic signal or I TS conduit.
D.Obtain approval for field bending of conduit with the Engineer in cases where factory sweeps are not appropriate. Field bending must be performed using a heat box or heat blanket . Torch heating conduit is prohibited. Install all conduit bends to have a radius that is not less than the following:
1.24 inches within the cabinet and pole foundations
2.36 inches in all other locations
3.46 inches for MD7 microduct bundle
4.40 inches for MD4 microduct bundle
5.36 inches for MD3 microduct bundle
6.32 inches for MD2 microduct bundle
7.12 inches for individual microduct
E.Install conduits that cross finished curbs and gutters, sidewalks, concrete flatwork, or textured or decorative surfaces by boring, jacking, or drilling. Replace any damaged concrete sections, joint to joint . Refer to Section 02221.
F.Proof all conduit before installation of cabling and detectable pull tape.
1.Use a mandrel at least 80 percent of the conduit diameter, at least twice as long as the conduit diameter, and composed of rigid material .
2.Schedule proofing with the Engineer at least 5 working days in advance of performing the work. ITS Conduit
3.Proof all conduit with a Department representative witness present.
4.Complete and s ubmit a completed Conduit Mandrel Test F orm for all ITS conduit.
5.Proof microducts using proofing balls.
6.Proofing balls must maintain a minimum 80 percent fill ratio of inside diameter of the microduct being tested.
7.Proofing must occur after all junction boxes have been installed to final grade, including placement of flowable fill or hand- mix grout at junction box walls, and after all excavation in the immediate proximity of the conduit system has been completed.
a.Re-proof any conduit segment where excavation has occurred near the conduits following initial proof testing.
G.Provide detectable pull tape in all conduits.
1.Install continuously between junction boxes.
2.Fasten securely to conduit plug and leave 6 ft of pull tape slack inside of the conduit.
3.Do not splice detectable pull tape in conduit.
4.Use flat profile, low stretch polyester, 1,200 lb tensil e strength detectable pull tape that is sequential footage marked.
5.Verify that the pull tape is detectable throughout its entire length by performing a continuity test or equivalent verification.
6.Detectable pull tape not required in microducts.
H.Encase open trench conduit in sand backfill covered by flowable fill within existing roadway, proposed roadway and sidewalk pavement areas only.
1.Seal junction box wall around conduits using flowable fill or approved hand- mix grout.
2.Use 6 inches of sand backfill covered with native material in all other areas.
3.Refer to AT Series Standard Drawings.
I.Use rigid metal conduit or schedule 80 PVC conduit for above ground application.
1.Liquidtight flexible metal conduit (LFMC) or liquidtight flexible non- metallic conduit (LFNC) is permitted in lengths not exceeding 6 ft where not subject to physical damage.
2.Apply corrosion protection to any portion of rigid metal conduit buried in the ground or encased in concrete.
J.Use PVC or HDPE conduit for underground application.
K.Warning Tape
1.Install orange warning tape with black legend “Caution - Buried Communication Cable, ” in all trenches containing multi -duct conduit or conduit containing communication cables. ITS Conduit
2.Install red warning tape with black legend “Caution - Buried Electric” in all other trenches.
3.Not required when flowable fill is directly overlaid with asphalt pavement or PCCP.
4.Not required when boring or plowing conduit.
L.Install a bushing or adapter at ends of all conduit s that contain a conductor according to the NEC.
M.Furnish and install Utility Marker P osts along the longitudinal conduit running line. Refer to AT Series Standard Drawings and Section 02842.
N.Install a #14 AWG solid, insulated locate wire inside of new or existing conduit with individual microducts.
1.Verify that all locate wires are detectable throughout their entire length by performing a continuity test or equivalent verification.
3.3 Trench
A.Paved Asphalt Surface
1.Install T -patch over trenched area according to AT Series Standard Drawings .
2.Cut pavement from roadway surface to roadway base on both sides of trench to provide a clean, straight wall for T -patch before any backhoe use according to Section 02705.
3.Refer to AT Series Standard Drawings for depth of flowable fill under paved surfaces.
4.Evenly apply tack coat on final backfill before installing T -patch.
5.Place r estoration patch – match the composition, density, and elevation ( ±¼ inch), of the existing surface according to Section 02741.
6.Apply a hot -pour rubberized asphalt joint sealant or approved equal after the patch is installed.
B.Sidewalk or Decorative Pavement
1.Use flowable fill to bottom of new pavement or sidewalk .
2.Match existing pavement thickness . New pavement thickness must be 3½ inches minimum and 8 inches maximum.
3.Restore sidewalk or decorative pavement to original condition or better after work is completed. Refer to Section 02776.
C.Unpaved Surface
1.Backfill using native material, if suitable, that matches the composition, density, and elevation ( ±0.2 inch), of the existing surface according to Section 0205 6. ITS Conduit
2.Dispose of surplus material promptly .
3.Sand Backfill
a.Use sand backfill in trench sections outside of existing roadway, proposed roadway, and sidewalk pavement areas, including exposed conduit locations when plowing or boring.
b.Provide 6 inches of sand backfill above conduit in trench. 1) Backfill trench above sand to finished grade using native material. a) Backfill and tamp in 6 inch lifts.
c.Compaction of sand backfill is not required.
D.Sleeve foreign utilities that cross a trench so they are not encased in flowable fill.
E.Place all conduits in the same trench whenever possible.
F.Flowable Fill or Hand -mix Grout
1.Install flowable fill or approved hand- mix grout to the wall of junction box to seal conduit entry into junction box.
2.Clean excess flowable fill or hand- mix grout from the inside of the junction box.
G.Install all conduits so the flowable fill or sand backfill completely encases all exterior surfaces of the conduit.
1.Separate multi -duct conduits using a commercially available conduit spacer or approved equivalent.
2.Place spacers no more than 4 ft apart and not more than 2 ft from each coupler.
H.Anchor the conduit in trench at 16 ft intervals to maintain the required conduit depth during flowable fill placement.
I.Minimum separation between all conduits and the wall of the trench is 1½ inches.
3.4 Bore Or Plow
A.Immediately contain, remove, and properly dispose of all excess drilling fluid.
3.5 Use of Existing Or Occupied Conduit
A.Maintain the physical condition and functional integrity of all cabling and wiring in existing or occupied conduit.
B.Cable or wire i nstallation in an existing or occupied conduit . ITS Conduit
1.Remove any existing fiber optic cable or copper wire.
2.Test the integrity and clean the conduit by successfully pulling a Department -approved mandrel through the conduit.
3.Re-pull existing and new fiber optic cable or copper wire together.
4.Perform all necessary splices and replace any impacted fiber cable and spider fan- out kits according to Section 13594 .
C.Use existing conduit in -situ only if shown and as approved by the Engineer .
D.Intercept individual microducts from existing microduct bundle mid- span and reroute to new junction box location:
1.Type II -PC junction box
a.Bury at existing microduct bundle depth.
b.Notch the 24- inch box walls and install junction box over existing microduct bundle.
c.Provide 12 inches of free draining granular backfill borrow underneath junction box.
d.Encase all conduit in flowable fill orhand- mix grout where the conduit enters the junction box.
e.Place locate ball or disk in junction box.
f.Ground rod, and grout floor are not required.
2.Conduit and microduct bundle inside of buried Type II -PC junction box.
a.Install conduit from buried junction box to new junction box location for rerouting of individual microducts. Provide #14 AWG solid, insulated locate wire inside of new conduit between junction boxes.
b.Extend conduit and microduct oversheath 6 inches beyond inside wall of the junction box.
c.Expose microducts by removing no more than 20 inches of oversheath.
d.Identify and cut only the individual microducts to be rerouted.
e.Use approved couplers and extend microducts to new junction box using corresponding microduct color.
f.Splice all locate wires together using an approved waterproof connector. 1) Verify that the locate wire conductors are not exposed.
3.New junction box location
a.Install new junction box within 20 ft of buried junction box or within 20 ft of edge of roadway when existing microduct bundle is underneath roadway, to provide access to locate wire for mapping and locating purposes. ITS Conduit
3.6 Repair Or Restoration
A.Restore all areas, including landscaping, concrete pavement, asphalt, finished curbs and gutters, box culverts, sewers, underground water mains, sprinkler systems, sidewalks, concrete flatwork, colored, textured, or decorative surfaces damaged during conduit and junction box installation.
B.Coordinate with local utilities for utility repair.
C.Notify the Engineer of all necessary repairs.
D.Replace all damaged facilities in kind.
E.Buried microduct bundle coupling and repair:
1.Expose microducts by removing no more than 12 inches of oversheath beyond area to be coupled or repaired.
a.Trim microducts to length as necessary to eliminate all bends and deflection.
2.Use approved couplers.
3.Splice the locate wires together using an approved waterproof connector.
a.Verify that the locate wire conductors are not exposed.
4.Protect exposed microducts, couplers and locate wire using split duct.
a.Seal split duct joints and split duct ends around microduct bundle oversheath using approved waterproof sealing tape or other approved methods prior to backfill.
b.Do not use heat -shrink or cold- shrink protection methods.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1222–1231 of 1,331.