14-13 demonstration latching an d unlatching at the top and connection of test cables at the
bottom. Twisting of the cables, failure of the carrier ring to latch or unlatch, unlevelness of the carrie r or hang- up of guide arms will be sufficient reason not to accept the lowering device. 1401 -3 CONSTRUCTION METHODS Use suitable blocking and slings to prevent warping of the high mount standard during storage and transportation. Assemble all parts and string all cables in strict accordance with the manufacturer's instructions. Make sure that the top of the standard is not out of plumb more than 0.5% of its height. Include assembly instructions and any special tools, blocks, washers, etc. in the portable drive storage case. Remove all dirt, stains, marks, etc. before erecting the high mount . Install a High Mount Junction Box with ground rod as shown in the plans . See Section 1411 for junction box construction methods. 1401 -4 MEASUREMENT AND PAYMENT High Mount Standards with lowering devices to be paid will be the actual number of standards installed and accepted. High mount light standards with lowering device, measured as provided above, will be paid at the contract unit price each for ____ High Mount Standard of the appropriate height. The High Mount Junction Box will be paid under Section 1411. The ground rod in the High Mount Junction Box is incidental to the High Mount Standard. Portable Drive Units with storage cases to be paid will be the actual number of porta ble drive units furnished and accepted. Portable drive units with storage case, measured as provided above, will be paid at the contract unit price each for Portable Drive Unit. Payment will be made under: Pay Item Pay Unit ____ High Mount Standard Each Portable Drive Unit Each 1404 -1 DESCRIPTION Furnish and install light standards less than 55 feet high complete with bracket arm(s), when required, and an AASHTO approved breakaway support (slip base, frangible base adapter, breakaway base), when required, as shown on the plans. 1404 -2 MATERIALS Provide certified computations and fabrication drawings by a n engineer licensed by the State of North Carolina. Provide a standard that meets the design criteria of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals and the Interim Specifications as shown on the plans . The support is to be designed for the wind velocity shown in the plan s. Provide a standard designed to support a luminaire, which has a center of gravity not more than 18 inches from the end of the support, with a minimum weight and projected area and, if required, a bracket arm length as indicated in the contract. Make sure that each light standard has a grounding lug in the standard located within 6 inches of the handhole or in the transformer base.
14-14 Deliver standards with a smooth uniform finish, free of disfiguring scratches or dents and with
suitable protection for further handling during erection. Wrap or package each light standard as recommended by the manufacturer to prevent damage during shipping and handling. Repair or replace, at the option of the Engineer, any standards with abraded finishes or other damage. Furnish aluminum or steel standards and bracket arms (when required) ; however, use the elected material througho ut the project. Galvanize steel components after fabrication. Use galvanization which conforms to the requirements of ASTM A123 for tubes, plates and bars and to ASTM A153 for hardware. Use connecting bolts, washers and nuts compatible with the transforme r base as recommended by the light standard manufacturer and which comply with the contract. Use anchor bolts, washers, nuts and shims which comply with the s pecifications and details shown in the plans as recommended by the light standard and transformer base manufacturer(s). Furnish anchor and/or connecting bolt covers and pole top caps with standards as indicated in the plan s. Provide pole hardware such as nuts, bolts and washers for aluminum standards from
18-8 stainless steel or aluminum alloy 2024 -T4. Provide nuts, bolts and washers for steel
standards from 18- 8 stainless steel or steel conforming to ASTM A307. Submit drawings for approval which show material specifications for each component. Luminaires may be either direct pole mounted or mounted to a bracket arm. Where bracket arms are required, use bracket arms for each standard which are the length shown in the plans and of the same material as the standard. For direct pole mounted luminaires, minimum setback distances shown in the Roadway Standard Drawing s must be maintained. Refer to specifications for luminaire weight and effective projected area (EPA). For light standards installed on the shoulder or in a grassy median, p rovide these light standards with an approved breakaway support that c omplies with AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals and the Interim Specifications as shown on the plans and one of the following descriptions:
A.A cast aluminum transformer base with an aluminum door ,
B.A frangible base insert or adapter, or
C.A slip base. Use the same type of breakaway support throughout the entire project. All breakaway supports shall be FHWA approved. When frangible base adapters are used, i nclude a shroud between the base pl ate and the foundation for protection for exposed wiring and conduit at the base of the standard. Secure the shroud in place in at least two locations. Provide Light Standard Junction Box sized as shown in the plans and meeting the requirements of Section 1411. 1404 -3 CONSTRUCTION METHODS Locate and number the light standards as shown in the plan s. Do not lay the standards on the ground without proper blocking and protection to prevent warping and discoloration. Protect the standards from damage by other construction work, including landscape mulching and fertilizing operations. Securely mount the standards on the anchor bolts, and plumb with nuts torqued according to the manufacturer's recommendation.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 713–714 of 857.