The Table of Contents for this section is available.
The work covered by this section consists of furnishing and installing light standards less than 75' high complete with bracket arm and breakaway base, as shown on the plans.
The standard design shall meet the design criteria of the AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals".
The standard shall be designed to support an ellipsoidal shaped luminaire which has a center of gravity not more than 18" from the end of the support. It shall be designed to support a luminaire with a minimum weight and projected area and a bracket arm length as indicated on the plans or in the specifications.
Each lighting standard shall have a grounding lug either in the standard near the base or in the transformer base. Its location shall be within 6" of the hand hole.
Standards shall be delivered with a smooth uniform finish, free of disfiguring scratches or dents, and with suitable protection for further handling during erection.
Each light standard shall be wrapped or packaged as recommended by the manufacturer to prevent damage during shipping and handling. The Contractor shall repair or replace, at the option of the Engineer, any standards with abraded finishes or other damage.
The Contractor, at his option, may furnish either aluminum or steel standards and arms; however, the type material he elects to use shall be used throughout the project.
Steel components shall be galvanized after fabrication. Galvanizing shall conform to the requirements of ASTM A123 for tubes, plates, and bars, and to ASTM A153 for hardware.
Connecting bolts, washers and nuts shall be compatible with the transformer base as recommended by the light standard manufacturer and shall comply with these special provisions and details shown in the plans.
Anchor bolts, washers, nuts and shims shall comply with the specifications and details shown in the plans as recommended by the light standard and transformer base manufacturer(s).
Anchor and/or connecting bolt covers and pole top caps shall be furnished with standards as indicated on the plans.
Pole hardware - Nuts, bolts, and washers for aluminum standards shall be made from 188 stainless steel or aluminum alloy 2024T4. Nuts, bolts, and washers for steel standards shall be made from 18-8 stainless steel or steel conforming to ASTM A307.
The drawings submitted for approval shall show material specifications for each component.
The bracket arm for each standard shall be the length shown on the plan sheet. They shall be of the same material as the standard.
Light standards shall have an impact attenuation feature (breakaway base) complying with one of the following descriptions and shall have been approved for use by the Engineer.
(a) A cast aluminum transformer base
(b) A frangible base insert or adapter; normally cast aluminum
(c) A breakaway or progressive shear base
(d) A slip base
The same type of breakaway device shall be used throughout an entire project for standards of the same type. The breakaway device shall comply with AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals". The device shall include protection for wiring and conduit at the base of the standard. This protection shall be in the form of a special heavy formed material secured in place.
The light standards shall be located and numbered as shown on the plans.
The standards shall not be laid on the ground without proper blocking and protection to prevent warping and discoloration. They shall be protected from damage by other construction work, including landscape mulching and fertilizing operations.
The standards shall be securely mounted on the anchor bolts and plumbed with nuts torqued according to the manufacturer's recommendation.
Mounting height is defined as vertical distance from luminaire to surface of pavement of heaviest traveled lane in area illuminated by the luminaire. A tolerance of 1'6" from the required mounting height will be permitted. If this tolerance is exceeded, the Contractor shall furnish and install an acceptable standard within this tolerance.
1404-4 MEASUREMENT AND PAYMENT.
The quantity of light standards to be paid for will be the actual number of light standards with arm assemblies of each mounting height and bracket arm type and length which have been installed and accepted.
The quantity of light standards, measured as provided above, will be paid for at the contract unit price each for "Light Standards, __________" of the appropriate mounting height and arm type and length. Such price and payment will be full compensation for all work of furnishing and installing the light standard with arm(s) on the foundation, including the impact attenuation device (breakaway base) as shown on the plans.
Payment will be made under:
Light Standards, __________ Each