ROADWAY WEATHER INFORMATION SYSTEM – ENVIRONMENTAL SENSOR STATION (RWIS-ESS)
PART 1 GENERAL
1.1SECTION INCLUDES
A.RWIS site preparation, including installing conduit, junction box, ground
rods, grounding conductors, and tower lower section.
B.RWIS tower foundation and concrete service pad.
C.RWIS solar power system, including installing ground rods, grounding
conductors, solar panel pole and support bars, and solar enclosure.
D.Solar panel foundation and concrete service pad.
E.State furnished and State installed equipment.
1.2RELATED SECTIONS
A.Section 02776: Concrete Flatwork
B.Section 03055: Portland Cement Concrete
C.Section 03211: Reinforcing Steel and Welded Wire
D.Section 05120: Structural Steel
E.Section 13553: ITS Conduit
F.Section 13554: Underground Junction Box
G.Section 16530: Electrical Power
1.3REFERENCES
A.ASTM A53: Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and
Seamless
B.National Electrical Code (NEC)
Roadway Weather Information System – Environmental Sensor Station (RWIS-ESS)
1.4DEFINITIONS Not Used
1.5SUBMITTALS Not Used
1.6DEPARTMENT SUPPLIED AND INSTALLED ITEMS
A.Upper tower section and associated equipment
B.Solar panels, mounting bracket, and battery box
C.Communication equipment
D.Remote processing unit
E.Environmental sensors
PART 2 PRODUCTS
2.1STATE FURNISHED ITEMS
A.Tower Base, Lower Tower Section
B.RWIS Cabinet
C.Solar Enclosure
2.2POWER
A.Use electrical components as listed and defined by the NEC.
B.Conduit. Refer to Section 13553.
C.Junction Boxes. Refer to Section 13554.
2.3CONCRETE SERVICE PAD
A.Concrete Flatwork. Refer to 02776.
2.4CONCRETE FOUNDATION
A.Class AA(AE) concrete. Refer to Section 03055.
B.Epoxy coated deformed reinforcing steel. Refer to Section 03211.
Roadway Weather Information System – Environmental Sensor Station (RWIS-ESS)
2.5TOWER AND SOLAR GROUNDING SYSTEM
A.Grounding Conductor
1.Bare, stranded 2 AWG copper grounding conductor. Refer to AT
Series Standard Drawings and NEC Article 250.
B.Ground Rod. Refer to Section 16530 and NEC Article 250.
C.Ground Clamps
1.Rod clamps: ANSI rated and UL listed for use on ¾ inch copper
bonded steel rods and bare, stranded 2 AWG copper grounding conductor.
2.Tower clamps: ANSI rated and UL listed for use on 1 inch
aluminum pipe.
2.6SOLAR PANEL POLE
A.Galvanized 4 inch nominal diameter schedule 80, ASTM A53 grade B
steel pipe. Refer to Section 05120.
PART 3 EXECUTION
3.1PREPARATION
A.Notify the Engineer at least 30 days in advance of beginning work on
RWIS-ESS facilities.
B.Contact the Engineer at least 14 calendar days before RWIS-ESS State
furnished items are needed to schedule pick-up of items.
C.Pick up State furnished items at the following location:
Utah Department of Transportation Traffic Operations Center (TOC) 2060 South 2760 West Salt Lake City, Utah 84104
3.2INSTALLATION
A.Construct according to the AT Series Standard Drawings
Roadway Weather Information System – Environmental Sensor Station (RWIS-ESS)
3.3SOLAR PANEL FOUNDATION AND POLE
A.Cast the foundation and concrete service pad monolithically.
B.Install solar panel pole plumb vertical.
3.4RWIS TOWER FOUNDATION AND CONCRETE SERVICE PAD
A.Cast foundation and concrete service pad monolithically.
3.5TOWER GROUNDING SYSTEM
A.Bury ground rods 6 to 12 inch below earth or concrete surface.
B.Install one grounding conductor for each tower leg as shown.
1.Run the grounding conductor down the tower leg and under the
concrete service pad.
2.Clamp the grounding conductor to the tower leg and the nearer (3 ft
from the tower leg) and farther (9 ft from the tower leg) ground rods.
a.Do not cut or splice the grounding conductor.
C.Install concrete encased electrode, according to NEC Article 250, in
foundation and bond to tower base. Refer to Section 16530.
D.Install equipment grounding conductor from devices to the grounding
conductor bonding point on a tower leg.
3.6SOLAR GROUNDING SYSTEM
A.Bury ground rods 6 to 12 inch below earth or concrete surface.
B.Install one grounding conductor to solar panel pole as shown.
1.Provide a 12-inch loop of grounding conductor in the solar
enclosure and run the grounding conductor down the solar panel pole and under the concrete service pad.
2.Clamp the grounding conductor to the nearer (3 ft from the pole)
and farther (9 ft from the pole) ground rods.
a.Do not cut or splice the grounding conductor.
C.Install concrete encased electrode, according to NEC Article 250, in
foundation and provide a 12-inch loop in the solar enclosure. Refer to
END OF SECTION Roadway Weather Information System – Environmental Sensor Station (RWIS-ESS)
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Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1265–1269 of 1,331.
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