ITS CONDUIT
PART 1 GENERAL
1.1SECTION INCLUDES
A.ITS conduit for communications 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.
1.2RELATED SECTIONS
A.Section 02056: Embankment, Borrow, and Backfill
B.Section 02221: Remove Structure and Obstruction
C.Section 02705: Pavement Cutting
D.Section 02741: Asphalt Mix
E.Section 02776: Concrete Flatwork
F.Section 02842: Delineators
G.Section 03575: Flowable Fill
1.3REFERENCES
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
1.4DEFINITIONS Not Used
1.5SUBMITTALS
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
2.1MATERIALS
A.Conduit and fittings for ITS communication and fiber optic conduit
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 in 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
3.1GENERAL
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 this Section, article 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
3.2INSTALLATION
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 exceeding 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 ITS 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 submit a completed Conduit Mandrel Test Form 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 tensile 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 conduits that contain a conductor
according to the NEC.
M.Furnish and install Utility Marker Posts 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.
3.3TRENCH
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 restoration 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 02056.
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.
3.4BORE OR PLOW
A.Immediately contain, remove, and properly dispose of all excess drilling
fluid.
3.5USE OF EXISTING OR OCCUPIED CONDUIT
A.Maintain the physical condition and functional integrity of all cabling and
wiring in existing or occupied conduit.
ITS Conduit
B.Cable or wire installation in an existing or occupied 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 or hand-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
3.6REPAIR 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.
END OF SECTION
ITS Conduit
Its Conduit in other states
Utah revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1222–1231 of 1,331.
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