Section 1721
17-18 Section 1721
GUY ASSEMBLIES 1721 -1 DESCRIPTION Furnish and install guy assemblies with all necessary hardware. 1721 -2 MATERIAL Refer to Division 10. Item Section Guy Assembl ies 1098 -8 Pole Line Hardware 1098 -7 Furnish m aterial, equipment and hardware under this section that is pre-approved on the ITS and Signals QPL available on the Department’s website. 1721 -3 CONSTRUCTION METHODS
A.Guy Assemblies for Signal Heads or Lead -in Cable Install guy assemblies with guy cable, guy guards, anchors, 3-bolt clamps and associated fittings. Use 2 -bolt attachment method where there is adequate room on the pole to comply with the NESC. Attach guy assembly and guy cable to 2 separate bolts with one bolt for span and one bolt for guy cable. Where adequate spacing is not available and a violation of t he NESC would occur with the 2-bolt attachment method, use approved one -bolt attachment method for attaching messenger cable and guy assembly. Bond guy assembly to new pole grounding system as described in Article 1720-3. Do not attach to existing guy asse mblies unless specifically approved by owner.
B.Guy Assemblies for Communications Cable When installing messenger cable for supporting only communications cable, use approved one-bolt attachment method for attaching messenger cable and guy assembly. Bond guy assembly to existing pole ground using parallel groove clamp or equivalent. If existing poles do not have a grounding system, install new grounding system for bonding guy assembly that complies with Article 1720 -3. Do not attach to existing guy assemblie s unless specifically approved by owner. 1721 -4 MEASUREMENT AND PAYMENT Guy Assembly will be measured and paid as the actual number of guy assemblies furnished, installed and accepted. No measurement will be made of guy cable, guy guards, anchors, clamps, grounding systems or fittings as these will be incidental to furnishing and installing guy assemblies. Payment will be made under: Pay Item Pay Unit Guy Assembly Each 1722 -1 DESCRIPTION Furnish and install riser assemblies with clamp -on, aluminum weatherheads or heat shrink tubing, galvanized pole attachment fittings and all necessary hardware.
17-19 1722 -2 Material
Refer to Division 10. Item Section Grounding Electrodes 1091 -6 Pole Line Hardware 1098 -7 Rigid Metallic Conduit 1091-3 Riser Sealing Devices 1098 -5 Wire 1091 -2 Furnish m aterial , equipment and hardware under this section that is pre -approved on the ITS and Signals QPL available on the Department’s website. 1722 -3 CONSTRUCTION METHODS Install risers with required weatherheads or heat shrink tubing on poles using pole attachment fittings. Maintain a 10 inch minimum and 18 inch maxim um offset from signal messenger to the top of riser for all risers. On utility -owned poles, maintain a 40 inch offset from electrical utility’s power conductors to top of riser and riser attachment fittings. Use approved heat shrink tubing retrofit kits w hen installing new fiber -optic or coaxial cable into exiting risers that contain existing fiber -optic or coaxial cables. Install heat shrink tubing retrofit kits in existing risers as specified. Use separate 1/2 inch riser with weatherhead for pedestrian p ushbutton. Use separate riser (1 inch minimum) with weatherhead for electrical service. Use separate 2 inch riser with weatherhead for signal cables (bundled). Use separate 2 inch riser with weatherhead for lead-in cable. Install condulet on all risers f or lead -in cable. Install condulets on risers for lead- in cable, railroad preempt interconnection cables and signal pedestals. Use separate 2 inch riser with heat shrink tubing for fiber -optic communications cables. Install risers with heat shrink tubing so that cable can be installed without violating its minimum bending radius. Install cable so it does not share a riser with any other cable. Use separate 2 inch riser with weatherhead for coaxial cables for spread spectrum radio antennae. Install heat sh rink tubing in accordance with manufacturer's recommendations. Provide tubing a minimum of 5 inches in length with a minimum of 2.5 inches extended over cables and 2.5 inches extended over risers after heat has been applied. Use nylon filler rods with UV protection or equivalent and sealing spacer clips to separate cables where multiple cables enter a riser. Ensure sealing spacer clips have a heat activated sealing compound with the sealing compound fully encapsulating the space between cables. Ensure heat shrink tubing provides a watertight fit around individual cables and outer walls of risers. Do not use cut sections of cable or any other devices instead of filler rods. Use aluminum tape around cables to prevent damage from sealing chemicals. Use a heat source that will provide even heat distribution around tubing. Ensure no damage occurs to any cables. Bond new risers, a minimum of 10 f eet above grade , to the pole ground using a #6 AWG minimum solid bare copper wire and an approved pipe clamp, a split bolt connector or parallel groove clamp. On pole mounted cabinets where the riser are connected to the cabinet, bond risers in the cabinet using ground bushings with a #6 AWG minimum solid bare copper wire to the cabinet ground bus. If a pole ground exists on the joint use pole, bond new riser to existing pole ground using #6 AWG minimum solid bare copper wire terminated with split bolt connectors or para llel groove clamp.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 816–817 of 857.