ELECTRICAL CONDUIT ON BRIDGE
PART 1 GENERAL
1.1SECTION INCLUDES
A.Electrical conduits and junction boxes installed on and adjacent to bridge.
1.2RELATED SECTIONS
A.Section 13554: Underground Junction Box
B.Section 16530: Electrical Power
1.3REFERENCES
A.ASTM F 512: Smooth-Wall Poly (Vinyl Chloride) (PVC) Conduit and
Fittings for Underground Installation
B.ASTM F 593: Stainless Steel Bolts, Hex Cap Screws, and Studs
C.Electronic Industries Association (EIA)
D.National Electrical Manufacturers Association (NEMA)
E.Underwriters Laboratory (UL)
1.4DEFINITIONS Not Used
1.5SUBMITTALS
A.Manufacturer’s product data and recommended installation instructions for
conduit expansion coupler for information.
PART 2 PRODUCTS
2.1ELECTRICAL EQUIPMENT
A.Use equipment conforming to the applicable standards:
1.National Electrical Manufacturer’s Association (NEMA)
Electrical Conduit On Bridge
2.Underwriters Laboratories, Inc. (UL)
3.Electronic Industries Association (EIA)
2.2CONDUIT AND FITTINGS
A.Schedule 40 PVC conduit and fittings when conduit is encased in
concrete.
1.Type EPC-40, rated for use with 90 degrees C conductors.
a.Conduit. Comply with NEMA TC-2.
b.Fittings. Comply with NEMA TC-3.
c.Conduit and Fittings. Comply with ASTM F 512, and UL 651
Listed.
B.Rigid metal conduit and fittings when the conduit is attached to the exterior
surface of the structure. Refer to Section 16530.
C.Conduit Expansion Coupler
1.Compatible with attached conduit
2.For use in electrical applications
3.Two-piece expansion system
4.Provides at least 8 inches of total travel distance
2.3FOAM TAPE SEAL
A.Use foam tape 3/8 inch or 1/2 inch thick and at least 3/4 inch wide.
2.4MOUNTED JUNCTION BOXES
A.Use galvanized or stainless steel NEMA 3 or 4, screw-cover junction
boxes.
1.Use junction box covers with at least four stainless steel screws.
B.Stainless Steel Hardware. Refer to ASTM F 593.
2.5UNDERGROUND JUNCTION BOXES
A.Refer to Section 13554.
2.6PULL TAPE
A.Flat profile, low stretch polyester, 1,200 lb tensile strength pull tape.
Electrical Conduit On Bridge
PART 3 EXECUTION
3.1CONDUIT EXPANSION COUPLER
A.Conduit encased in concrete
1.Install conduit expansion coupler immediately before placing
concrete.
2.Cut ends of conduit to position conduit expansion coupler so that
the piston (smaller diameter length of coupler) is completely within the open expansion joint.
3.Place the extent of the female coupler end 1/2 inch inside the face of
concrete on one side of the joint and the barrel 1/2 inch inside the opposite face of concrete.
4.Wrap piston in foam tape at least two complete revolutions to make
certain concrete will not interfere with the expansion mechanism.
a.Apply tape in individual rounds beginning at the face of the
barrel, do not spiral along the length of the piston.
b.Wrap tape gently so that it does not significantly compress
with the second revolution.
B.Exterior Conduit
1.Place conduit expansion coupler near the expansion joint.
a.Do not place a hanger or mounting point between the
coupler and the expansion joint.
2.Cut ends of conduit to set conduit expansion coupler in the half-way
expanded position.
3.2JUNCTION BOXES
A.Install junction boxes as shown.
1.Underground junction boxes. Refer to Section 13554.
3.3PULL TAPE
A.Install pull tape in each conduit.
B.Provide 3 ft of pull tape slack coiled in the parapet junction boxes and in
junction boxes installed in the ground, measured from the top of the junction box going out.
END OF SECTION
Electrical Conduit On Bridge
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1303–1305 of 1,331.
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