17-38 (F) Use a minimum of four 1/2 inch diameter expanding type anchor bolts to secure cabinet to
foundation.
G.Install minimum 4 inches above and 4 inches below finishe d grade.
H.Locate external stubbed out conduit at cabinet foundation so conduit is in middle of cabinet. Provide service conduit as the rightmost conduit coming into cabinet. Provide 2 spare conduits stubbed out; one pointed toward service pole and the other toward direction of lead in cable. Inscribe identification arrow in foundation indicating direction of spare conduits.
I.Give cabinet foundation a broom finish and chamfered edges .
J.Seal space between cabinet base and foundation with permanent, flexible, waterproof sealing material. 1750 -4 MEASUREMENT AND PAYMENT Signal Cabinet Foundation will be measured and paid as the actual number furnished, installed and accepted. Payment will be made under: Pay Item Pay Unit Signal Cabinet Foundation Each 1751 -1 DESCRIPTION Furnish and install controllers with cabinets and all necessary hardware. Furnish all pole or foundation mounting hardware, detector sensor cards, external electrical service disconnects, one Corbin Number 2 cabinet key, one police panel key, conflict monitors or malfunction management units , surge protection, grounding systems, AC/DC isolator cards and all necessary hardware. 1751 -2 MATERIAL 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. 1751 -3 CONSTRUCTION METHODS
A.General Remove existing controll ers and cabinets where required. Remove maintenance diary from cabinet and place in new cabinet or deliver to the Engineer. Take existing equipment out of service only at the time directed by the Engineer . Locate new cabinets so as not to obstruct sight distance of vehicles turning on red. Install controllers, cabinets, detector sensor units and hardware that provide required phasing, color sequence, flash sequence, interconnection, railroad clearance and preemption and emergency vehicle clearance and preemption. Stencil signal inventory number on cabinet side facing roadway. Use 3 inch black characters. Provide external electrical service disconnect at all new and existing cabinet locations unless otherwise specified. Do not program controller for late night flashing operation at railroad preemption installations. For all other installations, do not program controller for late night flashing
17-39 operation unless otherwise directed by the Engineer . Ensure all signal heads for same
approach flash concurrently during flashing operation. Provide serial number and cabinet model number for each new controller and controller cabinet installed. Install pole mounted cabinets so height to cabinet middle is 4 f eet. Activate controllers with proposed phasing and timing.
B.System Interconnection When interconnection of signals is required (via fiber optic, ethernet , wireless, etc.) , install communications interface equipment and hardware for signals. Demonstrate proper operation of interconnection using manual commands and bidirectional communication capability to each local controller from the respective master controller after interconnection is complete. Program telemetry command sequences and enable devices necessary for testing of communication between local controllers and field master controllers and between field master controllers and Department -furnished central computer. Where master controllers are not used, demonstrate proper operation of interconnection between local intersections controllers and a central system server.
C.Workshop Provide enclosed workshop to set up and test new controllers and cabinets before installation. Locate workshop within Division responsible for project administration. Ensure workshop provides protection from weather and suf ficient space to house 2 test observers, all necessary test equipment and material, controllers and cabinets. Configure and test each controller and cabinet to match the proposed signal design. Ensure all equipment furnished and installed or modified by t he Contractor at each location operates in full compliance with the plans and specifications . Test each controller and cabinet for proper color sequence, flashing operation, phase timings, preemption, coordination and conflict monitor programming or malfunction management unit programming. Ensure that simultaneous conflicting phase outputs will cause the cabinet to revert to flashing operation. For intersections with any type of preemption, submit a completed Preemption Test Procedure Checklist . The checklist is located on the Department’s website. Test the cabinet and controller for 8 hours minimum. Following this test and before installation, the Engineer will inspect the equipment in operation. The Engineer may require other tests to ensure proper o peration. These tests shall be at no additional cost to the Depar tment. 1751 -4 MEASUREMENT AND PAYMENT Controllers with Cabinet (____) will be measured and paid as the actual number of each type of controllers with cabinets furnished, installed and accepted. Detector Card (____) will be measured and paid as the actual number furnished, installed and accepted. No measurement will be made of conflict monitors, malfunction management units, external electrical service disconnect, grounding systems, modems, meter bases and workshop as these will be incidental to furnishing and installing controllers with cabinets. Payment will be made under: Pay Item Pay Unit Controller s with Cabinet (____) Each Detector Card (____) Each
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 836–837 of 857.