Steel Supports 720.03 Steel Mast Arm and Bracket Arm 720.04 High Mast Light Standard 720.05 S t e e l H - b e a m P o l e s 720.06 A n c h o r B o l t s 720.07 Wood Ornamental Light Standard 720.09 Wood Utility Pole 720.10 Mast Arm for Wood Utility Pole 720.11 B r e a k a w a y D e v i c e s 721.01 Transformer enclosures shall conform to NESC requirements. The y shall be approximately 46 inches high, 42 inches wide and 42 inches deep . Dimensions should be verified with the electrical Utility Company before ordering. Clearances shall be provided as required by the NESC. The enclosure shall be painted inside and outside with one coat of red iron-oxide primer and a finis h coat of gray baked enamel. Doors shall be furnished with padlock lugs. The electric portable power unit shall be a heavy-duty reversin g electric motor for the voltage and frequency shown on the plans and shall have a remot e control. The following are the minimum requirements for the high mast li ghting lowering system: Ball bearing motor Grounded frame Torque limiter Power unit mounting frame Coupling to winch drive shaft Remote control unit with cable Cable with twist lock recept acle and plug for operator of power unit All bolts for mounting lighting fixtures under bridge structures shall conform to the requirements of ASTM A307. These bolts and other fastening har dware shall be hot-dipped galvanized in accordance with ASTM A153.
Screened sand for bedding and covering direct buried cables sha ll meet the requirements of
634.022 Equipment List and Drawings Unless otherwise permitted in writing, the
Contractor shall submit for review a list of equipment and mate rials which is proposed to be furnished. The list shall include the name of manufacturer, si ze, and identifying number of each item and other necessary data, including detailed scale dr awings, wiring diagrams of special equipment and any proposed minor deviations from the pl ans. If requested, the Contractor shall submit sample articles of the material propose d for use. All of the above data except sample articles, shall be submitted in duplicate. Following checking, correction, and approval, not less than two c omplete sets of approved drawi ngs shall be submitted. The
Department will not be liable for material purchased, labor per formed, or work delayed before such review. Where electrical equipment is to be constr ucted as shown on the plans, the submission of detailed drawings and diagrams will not be re quired. Upon completion of the work, the Contractor shall submit three complete sets of corrected plans showing all construction changes.
3 Miscellaneous Material Insulating tape shall be of the self-bonding type
Jacket tape shall be of the water-resisting type. Friction tap e shall be rubber-impregnated, woven cotton fabric.
4 Light Standards The terms "conventional standard" or " conventional light
standard" shall mean the assembled metal base flange, transformer base or breakaway device, metal columnar shaft, metal overhanging bracket arm and incidental hardware. The term "high mast pole" shall mean the assembled base plate f lange, metal columnar shaft, luminaire tenon, mounting and lowering device and incide ntal hardware. For purposes of this specification, a structure shall be considered a high mast pole if the pole height, from base plate to the center of the luminaire, exceeds 55 feet. The design, materials and fabrication of Light Standards shall meet the requirements of the current edition of AASHTO “LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals” and interims thereto, a s noted below except as otherwise indicated within these specifications or on the plans . Light Standards with a luminaire mounting height in excess of 5 5 feet (high mast pole) shall be designed using the following criteria: Basic wind speeds based on a 1700-year mean recurrence interval K z as specified in Table C3.8.4-1 ( Height and Exposure Factors) Kd as specified in Table 3.8.5-1 (Directionality Factors) G as 1.14, minimum (Gust Factor) Cd as specified in Table 3.8.7-1 (Wind Drag Coefficients) Fatigue Importance Category I with V mean having a range of 9 mph < V mean ≤ 11 mph.
Light Standards with a luminaire mounting height of 55 feet or less shall be designed using the following criteria: Basic wind speeds based on a 700-year mean recurrence interval Kz as specified in Table C3.8.4-1 ( Height and Exposure Factors) Kd as specified in Table 3.8.5-1 (Directionality Factors) G as 1.14, minimum (Gust Factor) Cd as specified in Table 3.8.7-1 (Wind Drag Coefficients) Fatigue analysis is not required
For structural design purposes the luminaire mounting height fo r roadside installation is defined as the distance from the center of luminaire to the bas e plate bottom. For Light Standards mounted on structures and approaches to structures, t he luminaire mounting height shall be defined and measured as the distance of the cen ter of the luminaire to one of the following:
tidal waters, above mean high tide.
more than 10 feet below the base of the light standard. The design weight of luminai res shall be 60 pounds with an effe ctive projected area of 2.5 ft², except that pole top-mounted luminaires shall have an effective projected area of 5.0 ft². Light Standards mounted on a bridge structure or Light Standards fabricated with aluminum shall be equipped wit h an approved damping or energy-a bsorbing device. Deflections of Light Standards and bracket arms shall be limite d as follows:
applied at 18 inches below the pole top with a maximum deflecti on of 5% of the nominal pole length. A computer simulation or detailed computation usi ng Service I load combination (as specified in the AASHTO LRFD Specification for Structural Supports for Highway Signs, Luminaires, and Traffic Signals) establishing a maximum of 7% deflection of the nominal pole length may be used as an alternate method.
vector of the arm, of 50 pounds and a concurrent vertical load of 100 pounds, both loads applied at the luminaire tenon, without developing a measurable permanent set.
pole length under full design load when equipped with four lumi naires. Conformance to the above deflection criteria for Light Standards, bracket arms and high mast Light Standards shall be substantiated by detailed computations or computer simulation, accompanied by written methodology, or actual tests on materials produced for delivery under a Maine Department of Transportation contract. The base plates of Light Standards shall have workable leveling nuts beneath and above them with flat washers against both nuts, when erected. The di stance between the bottom of the base plate and top of the foundation shall not exceed twice the diameter of the anchor bolts. Grout, or other material, shall not be placed between t he base plate and foundations.
Approval for deviations from the plans and/or specifications sh all be requested in writing and shall be approved by the Fabrication Engineer befor e being incorporated in the manufacturer's drawings. Requests for substitution for all spe cified material shall be submitted in writing with full documentation (specifications, m ill certifications, etc.) enabling the Department to evaluate the proposal. A Certificate of Compliance shall be provided for all applicabl e materials noted in Section 634.021 – Materials, in accordance with the requirements of the General Statement of Division 700 Materials. Shop certification in accordance wi th Section 504.04 is required.
5 Conventional Light Standards After execution of the co ntract for conventional
Light Standard(s), and before any shop work is commenced, the C ontractor shall submit for approval the manufacturer's drawings of all standards and acces sories proposed to be furnished and erected under this contract. The drawings shall be of sufficient detail to indicate material and/or dimensional conformance with these spe cifications and the plans. Each drawing shall contain a reference to the design criteria a nd certification that the design criteria have been met for the Light Standards, including brack et arms and associated hardware, fittings and breakaway devices, as submitted. A Prof essional Engineer licensed in accordance with the State of Maine regulations shall sign th e certification under their official seal. The drawings shall use the same units as found in the project plans. It is the intent of these specifications that the Contractor sh all be fully responsible for the adequacy of the sizes, wall thickness, materials and connections of the Light Standards, including bracket arms and associated hardware, fittings and br eakaway devices. Approval of the drawings will signify only a pproval of the material(s), mounting heights(s) and bracket arm length(s).
6 High Mast Light Standard For all high mast Light Stand ards, as defined in this
Section, the Contractor shall submit for approval, in addition to the manufacturer's drawings, 3 sets of the design computations , including fatigue considerations consistent with AASHTO requirements. Approval of the drawings and computations will signify approval of all structurally significant details of the Light Standard a nd if any, the luminaire mounting and lowering device. All drawings and computations shall be si gned by a Professional Engineer licensed in accordance with the State of Maine regulations. Approval will be based on the applicable provisions of Section 105.7. The shaft shall be provided with an equipment access opening ap proximately 2 ft² and centered approximately 2 feet above the base. The access openi ng shall be reinforced to maintain the full design stre ngth of the shaft and shall be pro vided with a hinged, removable, access door equipped with a vandal proof means of be ing locked in place. A positive means of internal grounding shall be provided inside o f the access door. All shaft sections shall be one plate thickness, except that a doubler plate may be used around the equipment access opening. The walls of polygonal sh afts shall have an inside corner radius to wall thickness ratio not less than 2.