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IOWA SPECIFICATIONS & Guidelines
Iowa Department of Transportation
Iowa DOT Standard Specifications with GS-15012 Revisions
2554.03 (6)
Water Mains, Valves, Fire Hydrants and Appurtenances, Tracer System Installation
Tracer System Installation.
a.
Install with all buried water main piping. Refer to the contract documents for details of tracer wire installation.
b.
Begin and terminate the system at all connections to existing mains.
c.
Install wire continuously along the lower quadrant of the pipe. Do not install wire along the bottom of the pipe. Attach wire to the pipe at the midpoint of each pipe length. Use 2 inch wide by 10 mil thick polyethylene pressure sensitive tape.
d.
Install splices only as authorized by the Engineer. Allow the Engineer to inspect all below grade splices of tracer wire prior to placing the backfill material.
e.
Install ground rods adjacent to connections to existing piping and at locations specified in the contract documents.
f.
Bring two wires to the surface at each fire hydrant location and terminate with a tracer wire station.
g.
Final inspection of the tracer system will be conducted at the completion of the project and prior to acceptance by the Engineer. Verify the electrical continuity of the system. Repair discontinuities.
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4150.02 (E)
Water Main, Valve, Fire Hydrant, and Appurtenance Materials, Pipeline Accessories
Tracer System.
Refer to the contract documents for details.
1) Open Cut.
a)
Solid Single Copper Conductor.
(1) Size:
No. 12 AWG.
(2) Insulation Material:
Linear low-density polyethylene (LLDPE) insulation suitable for direct burial applications.
(3) Insulation Thickness:
0.030 inches, minimum.
(4) Tensile Strength:
150 pounds, minimum
(5) Operating Voltage:
Rated for 30 volts
b)
Bimetallic Copper Clad Steel Conductor.
(1) Size:
No. 14 AWG.
(2) Rating:
Direct burial.
(3) Operating Voltage:
30 volts.
(4) Conductivity:
21%.
(5) Copper Cladding:
3% of conductor diameter, minimum.
(6) Insulation Material:
High density polyethylene.
(7) Insulation Thickness:
0.030 inches, minimum.
(8) Tensile Strength:
175 pounds, minimum
2) Directional Drilling/Boring.
a)
Bimetallic Copper Clad Steel Conductor.
b) Size:
No. 12 AWG.
c) Rating:
Direct burial.
d) Operating Voltage:
Rated for 30 volts.
e) Conductivity:
21%.
f) Copper Cladding:
3% of conductor diameter, minimum.
g) Insulation Material:
High density, high molecular weight polyethylene.
h) Insulation Thickness:
0.045 inches, minimum.
i) Tensile Strength:
1100 pounds, minimum.
b.
Ground Rod:
3/8 inch diameter, 60 inch steel rod uniformly coated with metallically bonded electrolytic copper.
c.
Ground-rod Clamp:
High-strength, corrosion-resistant copper alloy.
d.
Splice Kit:
Inline resin splice kit with split bolt (1 kV and 5 kV) for use with single conductor and unshielded cable splices in direct bury and submersible applications.
e.
Tracer Wire Station:
Comply with the contract documents.
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4189.01 (C)
Traffic Signal Equipment, Wiring and Cable
"3.
Tracer Wire:
Comply with No. 10 AWG, single conductor, stranded copper, Type thermoplastic high-heat nylon-coated (THHN), with UL approval, and an orange colored jacket."
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