7-86 provided with a wire inlet as shown on the standard details. On dual-purpose poles, a pull wire shall be provided for the luminaire.
b.Pedestal Poles Shafts shall be 4 inch nominal ID, schedule 40 pipe without splices. The length of the pole plus the base shall be 10 feet, except t hat the length of poles supporting only pedestrian heads shall be 8 feet.
c.Bridges, Cantilever, and Butterfly Type Sign Support Structu res The configuration of the foundations, bases, shafts, and trusses shall be of the Con tractor's design as approved by the Resident and shall use only material specified above.
720.04 Steel Mast Arm and Bracket Arm Material for mast arms a nd bracket arms shall
be as specified in Section 720.03. Int ernal diameters, bents, joints, and attachments shall permit internal wiring in the upper member of the arms. Arms s hall be hot dipped galvanized, both inside and outside, in conformance with AASHTO M 111. All work shall conform to the applicable provisions of Section 504 - Structura l Steel.
a.Mast Arms for Signals Mast arms may be of the single member or the truss type. Single member type mast arms shall be a single, straight or tap ered, round member and may incorporate a maximum of 2 telescopic splices. Truss type mast arms shall be of a tapered design consisting of an upper and a lower member connected by v ertical struts welded to form an integral unit. Mast arms shall be equipped with sturdy signal hangers and/or appropriate tenons for mounting the signal heads and shall have weatherproof wire inlets located close to the suspended signal heads.
b.Bracket Arms for Luminaires Bracket arms may be of the sing le member or the truss type. Single member type bracket arms shall be of the tapered u psweep design. Truss type bracket arms shall be of a tapered design consisting of an uppe r and lower member connected by a single vertical s trut, welded to form an integra l unit. Bracket arms shall be equipped with an appropriate tenon f or the attachment of the lu minaire.
720.05 High Mast Light Standard High mast light standards shal l have a cross section
that is either round or polygonal with not less than 12 sides, and shall have a uniform taper from the base to the top, except that an expanded base section may be used, if required, to accommodate the electrical and mechanical equipment. All work shall conform to the applicable provisions of Section 504 - Structural Steel. For unpainted high mast structures, material for the shaft, ba se and attachments shall conform to the requirements ASTM A 709 Grade 50W or ASTM A 595, Grade C. The base plate and reinforci ng components of high mast poles s hall be considered main load carrying members and shall comply with the requiremen ts of Table A, Section
713.01 Structural Steel. If applicable, the Contractor shall submit a proposed coating
specification for approval by the Fabrication Engineer.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 791–791 of 817.