6-123 dimensional conformance with these specifications and the plans . Each drawing shall contain a reference to the design criteria and a certification that the design criteria have been met for the Traffic Signal Structures, including poles, mast ar ms and associated hardware and fittings, as submitted. The certification shall be signed by a Professional Engineer licensed in accordance with State of Maine regulations under th eir official seal. It is the intent of these specifications that the Contractor sh all be fully responsible for the adequacy of the sizes, wall thicknesses, materials and connecti ons of the Traffic Signal Structures, including poles, mast arms and associated hardware and fittings. Approval of the drawings by the Fabrication Engineer will signify only approval of the materials, mounting height(s) and mast arm length(s). Approval of deviations from the plans and/or specifications shall be reque sted in writing and approved by th e Fabrication Engineer before being incorporated in the manufacturer's drawings. The Contractor shall furnish and install all electrical fitting s, pipe, switches, fuses, and such other material necessary to install the equipment properly and securely. All equipment shall conform to the applicable code and be of first-class work manship. All electrical fittings shall be complete with weatherproof gaskets. A Certificate of Compliance shall be provided for all applicabl e materials noted in Section 634.021 – Materials, in accordance with the requirement s of the General Statement of Division 700 Materials. Shop certification in accordance wi th Section 504.04 is required. 643.024 Miscellaneous Materials Span wire shall be minimum 5/16 inch diameter, minimum, 7 strand, extra-high strength, galvanized steel wire. Anchors shall be power installed and sized according to strain and soil conditions. A ll hardware, such as strand vise feed-thru dead ends, preforming guy grip dead ends and angle th imble-eye bolts, shall be standard pole line hardware. Guying of poles shall meet the requirements of Grade "B" Constr uction as defined in the NESC. Guys shall be installed in line with the direction of pu ll. Anchors shall be power installed so that the centerline of the anchor rod will be with in 10° of the line of the guy wire. The holding capacity of the anchor shall be 1.25 times t he calculated load on the guy wire. Guy wires shall be utility grade and the maximum working stress shall not exceed half of the maximum ultimate tensile strength of utility grade guy s trand. Where bedrock is encountered, rock anchors shall be used. Pipe standoffs for sidewalk anchors shall be galvanized steel p ipe sized according to the offset distance from anchor to pole and shall be fitted with st andard guying hardware. Messenger wire shall be ¼ inch diameter, 7 strand, extra-high s trength, galvanized steel wire, unless otherwise specified. 6-124 LED lamps shall have a regul ated power supply designed to elect rically protect the diodes. The lamp shall be watertight and sealed to eliminate c ontaminants. The lamps shall be capable of operating at ambient air temperatures of -40°F to 140°F. Lamp life shall be a minimum of 100,000 hours of continuous ope ration. They shall be manufactured using the Allen Gap Technology. Power consumption for 12 inch indications including power supply shall not exceed 20w.
643.03 General Installation details will be shown on the plans and/or specifications. The
location shown for all equipment and vehicle detectors is appro ximate; final locations will be determined in the field. During installation, all heads installed but not operating shal l be covered or otherwise concealed from view. The requirements of certain Sections of this specification may be waived for temporary traffic signals and traffic signa l modifications, if so noted o n the plans.
643.04 Poles Wood poles shall be placed in the ground to a dep th of 20% of their
overall length, with a maximum deviation from the vertical of ¼ inch in 5 feet. After each wood pole has been set in the ground and plumbed, th e space around the pole shall be backfilled with selected earth or sand, free of rocks and other deleterious material, placed in layers approximately 4 inches thick. Each layer shal l be moistened and thoroughly compacted. Traffic Signal Structures shall be erected in a vertical positi on, with a maximum deviation from the vertical of ¼ inch in 5 feet using the level ing nuts provided with the anchor bolts. Once the poles have been plumbed, the top nuts s hall be tightened by bringing the nut to a snug tight condition using the full effort of a wo rker using a spud wrench or compatible tool. After all nuts have been brought to a snug, t ight condition, each nut shall be tightened an additional one-third turn, using an impact wren ch, torque wrench or large crescent wrench. A minimum of two full threads shall project b eyond the outside face of the nut. Nuts and bolts, other than anchor bolts, shall also be ti ghtened by the above procedure. When foundations and anchor bolts have been installed by others , the Contractor shall verify the anchor bolt dimensions at each location so that base s will be furnished with properly located and sized bolt holes. Wires in poles shall be supported with a Kellum-type, braided, strain-relief grip attached to a "J" hook mounted inside the pole near the top. 643.041 Foundations Foundations for Traffic Signal Structures shall meet the requirements of Section 626 – Foundations, Conduit, and Junctio n Boxes for Highway Lighting, Traffic Signals, and Highway Lighting. 6-125
643.05 Loop Detector and Loop Detector Wire Installation The d etector unit shall be
located in the controller. No more than four loops shall be co nnected to a single detector amplifier. Detectors shall be installed according to the manufacturer's re commendation, subject to approval. Each detector shall be supplied complete with compre hensive installation instructions. The pavement slot for wire shall be 2 to 3 inche s below the finished surface and not closer than 18 inches from the edge of pavement or the curb. The right-angle corners of the pavement slot shall be chamfered to eliminate sh arp bends in the loop wires. Loop detector wire shall be number 14 or number 12 AWG copper c onductors drawn through vinyl plastic tubing approxi mately ¼ inch in diameter. All pulse loop "approach" wiring shall be insulated red and shall be permanently marked " A", "B", "C", or "D", according to the "approach" guidelines in the controller cabine t. All pulse loop "presence" wiring shall be insulated black and shall be permanently marked according to the "presence" guidelines in the controller cabinet. All loop lead-ins shall be of the same conductor with no splicing. The lead-in from the amplifier to the beginning of t he loop shall be shielded pairs, as shown on the plans. All debris and moisture shall be removed from the loop pavement slot before installation of loop wires. The pavement slot shall be filled to the road s urface with an approved sealing compound to form a waterproof bond w ith the pavement after inst alling the wire loop. Detector conductors shall not be housed in the same jacket as t he signal conductors.
643.06 Microwave Detector Installation The microwave detector s hall be installed in
accordance with the manufacturer's recommendations. A four-con ductor wire shall be installed from the microwave unit to the controller. All angle s and adjustment of patterns shall be the responsibility of the Contractor. The detectors s hall operate in either pulse or presence mode.
643.07 Span Wire, Messenger Wire, and Guy Wire All span wire, messenger wire, and
guy wire installations shall be in conformance with the require ments of the Utility Companies, when installed on Utility Facilities. All span wire hanging traffic signals permanent or temporary wi ll have a bottom tether wire to prevent the signal from excessive swinging All span wires, messenger wires, guy wires, terminal boxes, con troller cabinets, or any other metallic surface that might be contacted by people, shall be bonded to ground. All sidewalk guy wires and slant guy wires installed in a sidew alk area shall be equipped with full-round or half-round guy guards.
643.08 Conduit All conductors under roadways from the controll er to the mast arm
poles shall be 3 inch schedule 80 PVC. 6-126
643.09 Service Connection The Contractor shall furnish and ins tall the necessary
electrical service as directed by the Utility Company. The Con tractor shall make all arrangements for the service connection and be responsible for all charges incurred thereby. Under no condition shall any equipment, except that shown on th e plans, be installed on any Utility Facilities. Traffic signal services shall have an automatic transfer switch such as a GENERLINK model MA23/24 – S installed, thi s will be required on traffic signals only not beacons or dynamic signs. Whenever a service connection is to be made, the Contractor sha ll contact the Utility Company involved and inform them of the location, pole number, and time proposed for the service connection. The traffic cabinet shall be marked with: An appropriate arc flash plaque or decal with the following inf ormation Flash hazard boundary Cal/cm2 hazard at 18 inches PPE level Shock hazard when cover is off Limited approach boundary Restricted approach boundary The prohibited approach boundary This shall be located on the outside of the equipment and shal l be visible, weatherproof, and fade resistant, and not easily removed. The Contractor shall be responsible for all outstanding bills f or preliminary work done by the Utility Company during the i nstallation of the traffic s ignal system, to facilitate the service connection. A service ground rod shall be installed if the service meter tr im is not grounded. A total of 4, 10’ service ground rods shall be installed and pr operly connected together in the cabinet foundation.. The Contractor shall be responsible for grounding the system to 5 ohms or less tested without an electrical connection to the utility neutral or grou nd conductor. The grounding shall be performed using a ground meter with reference grounds. In the event that a 5-ohm reading is not achieved, the Contractor shall install a chem-ro d grounding electrode in close proximity to the cabinet. The chem-rod shall be properly connec ted to the four rod, grounding system in the cabinet. The chem-rod shall consist of a 10’ copper rod (vertical or horizontal orientation) filled with common salt and desiccant, back filled with natural earth