455 ALASKA 2020 SECTION 661 ELECTRICAL LOAD CENT ERS
661-1.01 DESCRIPTION . Furnish and install load center assemblies at the locations indicated in
the Plans. Modify existing load centers when indicated. Use load centers of the following types as shown on the load c enter detail sheets: Type 1: Pad mounted with underground service (large) Type 1A: Pad mounted with underground service (small) Type 2: Post mounted with underground service Type 3: Pole mounted with overhead service
661-2.01 MATERIALS. Use materials that conform to Section 740, the Materials Certification List,
the Plans, specifications, and the following. Concrete Section 550, Class B Grout Subsection 701- 2.03 Reinforcing Steel Section 503 Wood Posts . Construction grade, 6 x 6 inch nominal dimension S4S D ouglas Fir, Hem -Fir, Western Larch, Western Hemlock, Mountain Hemlock or Southern Pine meeting Standard Grading and Dressing Rules , West Coast Lumber Inspection Bureau. Treat the posts according to Section 714. Load Center . NEMA 3R enclosure constructed of zinc-coated A60 finish sheet steel per ASTM A653 and ASTM A924, with no external screws, bolts, or nuts. Shop coat cabinet components with a 2- part urethane paint undercoat and 2- part urethane finish coats. Finish coats must be standard white for removable panels and non- gloss silver -gray, closely matching FSS No. 5950 Color No. 36622, for the enclosure. The load center must be labeled as a unit by a State of Alaska- approved independent electrical testing laboratory (such as UL, ETL, CSA, etc.) defined by ANSI Standard Z34.1 Third -Party Certification Programs for Products Processes and Services and conform to applicable published standards noted herein, the Plans, and Special Provisions. The load center must be marked with the maximum available fault curr ent and the date the fault current calculation was performed. The marking must be sufficiently durable to withstand the environment. The load center must be labeled as service entrance equipment. Panelboards . Load panels in load centers must conform to FS S W -P-115C, Type 1 - Circuit Breaker Panelboards; UL 67 - Panelboards ; and NEMA PB1 - Panelboards with Molded Case Circuit Breakers . The rated voltage of the panels must be as noted on the load center summary in the Plans, 120/240 volts or 240/480 volt sin gle phase or 120/208 volt or 277/480 volt three- phase. The ampacity rating of panels must not be less than the ampacity noted on the load center summary, 100 amps minimum, at rated voltage. Provide separate copper neutral and ground buses. A label must be applied to the exterior of the panelboard indicating the potential arc flash hazard at the enclosure. The label must comply with NEC 110.16(A) and must include the information required by NFPA 70E, including the estimated arc flash incident energy as calc ulated per IEEE 1584. Circuit Breakers . Use bolt -on type circuit breakers with a copper bus. The series rated interrupting capacity of the circuit breakers in the panels must not be less than shown on the load center summary, or 10,000 AIC minimum, at rated voltage. Ensure that the circuit breakers installed are rated to be operated in the ambient temperatures to which they will be exposed. 456 ALASKA 2020 Use circuit breakers that are molded- case thermal -magnetic types with single- trip indicating switch handle. They must have an enclosed toggle type operating mechanism with quick - make/quick -break action and have a trip- free disconnect from the switch handle that will prevent the contacts from being held in the closed position. The circuit breakers must have the frame size, interrupting capacities, and trip rating clearly marked on the breaker. Multi -pole circuit breakers must have a common trip mechanism. Contacts must be silver alloy enclosed in an arc quenching chamber. Overload trip ratings must be self -compensating for ambient temperatures from 14 °F to 140 °F. Circuit breakers must be 240 or 277 volt maximum rated for 120/240/277 volt circuits, whichever is applicable, and have an interrupting capacity (RMS - symmetrical) of not less than 10,000 amperes. They must have not less than 480 volt rated for circuits above 277 volts and have an interrupting capacity (R.M.S. - symmetrical) of not less than 14,000 amperes. Contactor . Electrically -held type consisting of an operating coil, a laminated armature, contacts, and termi nals. Contacts must be fine silver, silver alloy, or superior alternative material rated to switch the specified load, 30 ampere minimum at rated voltage, and be normally open, unless otherwise noted. Contactor coils must be rated for operation at 240 VAC. Meters . Equip all meter sockets mounted in Type- 1 and Type -1A load centers with internal mounted meters with manual circuit closing devices. The devices may be either the link or lever type. Do not use the horn and sliding types. Equip all load centers wi th internal mounted meters with safety sockets (that is, provisions for de- energizing the meter jaws). The test section cover must be sealable with a 0.047- inch stainless steel bail. Transformers . Transformers in load centers containing load panels of diff erent nominal voltages must be isolated winding type with primary and secondary voltages and kVA ratings as noted on the Plans. Transformers must carry rated volt -amperes continuously without exceeding a 240 °F temperature rise above a 100 °F ambient temperature. Where installed outside of the load center enclosure, use a non- ventilated transformer enclosure fabricated from aluminum, stainless steel, or galvanized steel and filled with high- melting point, thermal setting, or epoxy insulating compounds to prevent moisture from entering the winding enclosure. Coat enclosures fabricated from sheet metal with moisture- resistant paint. Insulate transformer leads with non -hygroscopic material and extend them 9 inches beyond the winding chamber seal. Conductors . Stranded copper with either type XHHW -2 or RHW insulation. Conduit . Galvanized rigid conduit made of mild steel meeting UL standard UL- 6. Terminals . Size all terminals according to the amperage ratings of the conductor used. They must be suitable for termi nation of copper and aluminum conductors. Photoelectric Controls . Use photoelectric controls rated for operation at 240 VAC. Galvanizing . Galvanize steel materials according to Subsection 716- 2.07. Repair damage to galvanized coatings per AASHTO M 36. Weld ing. Perform welding according to Subsection 504- 3.01, and the requirements of the individual items. Equipment List(s) and Drawings . Within 30 days after the Contract award, submit 8 collated copies of a portfolio of equipment and materials proposed for installation to the Department for review and approval. Include a table of contents in the portfolio(s) that includes each item’s intended use(s) and the following:
1.Materials on the Qualified Products List: A description that includes product name, manufacturer, model or part number, and the conditions listed for approval. 457 ALASKA 2020 2. Materials Not on the Qualified Products List : Catalog cuts that include the manufacturer’s name, type of product, size, model number, conformance specifications, and other data as may be re quired, including manufacturer’s maintenance and operations manuals, or sample articles.
3.Materials Not Requiring Certification : Incidental materials incorporated into the work (such as nuts, ties, bolts, washers, etc.) must meet all applicable Specifications and be installed per all manufacturer’s recommendations. Certification is not needed unless required by the Special Provisions or requested by the Engineer.
661-3.01 CONSTRUCTIO N REQUIREMENTS. Install load centers at the location and position
shown on t he Plans. Any deviation from the plan location must be coordinated with and approved by the serving utility and the Engineer. Furnish conduit, conductors, contactors, breakers, transformers, and all other necessary materials at all new and modified load centers to complete the installation. Install a rigid metal conduit of the size shown in the Plans at a 30- inch depth from the load center and extend it to a location 2 feet from the power source. Install a pull rope in the conduit, cap the end, and mark the terminus with a 2- x 4-inch stake or 1- inch rebar, 3 feet long. Extend the end of the stake or bar 1 inch above the ground. When the servicing utility requires the complete conduit and weather head to be in place on the designated service pole, furnish and install all materials required by the utility. The additional work and materials are subsidiary to the load center bid item. Where the service is to be installed on a utility -owned pole, coordinate the positioning of the riser and service equipment with the service utility. House circuit breakers, switches, and contactors in a NEMA 3R type enclosure listed by an approved independent electrical testing laboratory as service equipment with a hinged and locking front cover. Indelibly label panel covers with the circuit number. Legend plates, labels, and signs must be engraved plastic or metal fastened with screws, non- cold- susceptible adhesive, or component mounting hardware. Size and wire load center cabinets to serve the combination of highway lighting, traffic signal, and thaw wire circuits shown in the Plans. Each cabinet must be a single box subdivided to form compartments as required. Include hinged lockable door(s) or panel cover(s) with provision for a padlock with a 5/16 inch diameter shackle for each compartment. Circuit breaker ratings must be as shown in the load center summary for each location. Wire and equip load centers with commonly metered thaw wire and lighting circuits with separate contactors, selector switches, and terminal blocks for lighting and thaw wire circuits. Control the thaw wires as described in Section 616. Where a meter is required, furnish and install a meter socket that is acceptable to the serving utility, complete with sealing rings. Do not mount the meter socket on doors or removable panels. Load centers containing contactors must have contactor control switches mounted in the load distribution section. Control switches for systems having automatic controls (for example, photo cell, thermostats, or time controls) must be 3- position types with the positions labeled “On”, “Off” and “Auto”. Control switches for manual control only must be a 2- position type with positions labeled “On” and “Off”. Label each switch to identify function being controlled. Mount transformer fuses in dead- front fuse holders with lighted blown fuse indicators, where required. Label them to indicate function and fuse amp rating. 458 ALASKA 2020 Install a 3/4- inch x 10- foot copper clad ground rod inside the base readily accessible through the removable cover, or adjacent supporting post. Connect ground rod to neutral bus with a soft - drawn copper grounding electrode conductor sized per NEC, No. 6 AWG minimum. Bond all non- current carrying metal parts of the load center to the ground bus. Locate the photo cell for lighting control on the nearest light standard or top of the load center as shown on the load center summary. Orient it to the unobstructed northern sky. Submit for approval the method of attachment of the conduit to the load center. Use either a 3/C or a 5/C No. 14 AWG cable to connect the photo cell to the load center. When the photo cell is on a lighting standard with a breakaway base, use an approved break -away disconnect in the base of the light standard. Restrain the cable in a similar manner as the lumination cable in the pole base. Provide a typed circuit directory for each load panel inside of the load center door, protected with a plastic cover, describing each circuit, with even and odd numbered circuit breaker positions shown on separate parts of the directory. Provide a power and control one- line diagram protected by a laminated plastic cover inside the load center. Include the following information on the directory and one- line diagram: Load center identification (A, B, etc.), Project Name, Project number (Federal/State) and Service Voltage.
661-4.01 METHOD OF MEASUREMENT. By the actual number of load centers, modified load
centers, and transformers completed and accepted shown on the Plans or as directed.
661-5.01 BASIS OF PA YMENT. Load circuits, consist ing of conduits and conductors attached to
the load centers and photoelectric controls, and terminations of field wiring, are subsidiary to other items of work. Payment will be made under: PAY ITEM Item Number Item Description Unit 661.0001.____ Load Ce nter, Type 1 EACH 661.0002.____ Load Center, Type 1A EACH 661.0003.____ Load Center, Type 2 EACH 661.0004.____ Load Center, Type 3 EACH 661.0005.____ Modify Load Center EACH 661.0006.____ Transformer, EACH 661.0007.____ Modify Load Center LS 459 ALASKA 2020 SECT ION 670 TRAFFIC MARKINGS
670-1.01 DESCRIPTION. Furnish and place traffic markings of the type, color, dimensions, and
at the locations shown on the Plans. Meet these specifications and the applicable portions of the Alaska Traffic Manual.
670-2.01 MATERIA LS. Use materials that conform to the following:
Traffic Paint Subsection 708- 2.03 Glass Beads Subsection 712- 2.08 Preformed Pavement Markings Subsection 712- 2.14 Raised and Recessed Pavement Markers Subsection 712- 2.15 Methyl Methacrylate Pavement Mark ings Subsection 712- 2.17 Glass Beads for Methyl Methacrylate Markings Subsection 712-2.18 Construct the iron casting for the raised pavement markers of modular iron meeting ASTM A536. Submit a manufacturer certification for both the Methyl Methacrylate mat erial and glass beads to certify that the materials furnished conform to these Specifications.
670-3.01 CONSTRUCTIO N REQUIREMENTS. Install interim pavement markings meeting
Section 643 if permanent markings are not installed prior to opening the roadway to traffic.
1.Paint.
a.Apply paint only to pavements that are clean, dry, and warmer than 40 °F.
b.Remove all dirt, oil, grease, and other foreign matter from the surfaces to be painted in a satisfactory manner.
c.Apply the paint at the rate of 80 ft2/gal (approximately 20 mils wet film thickness). This rate is effectively 22 gallons of paint per mile of solid 4- inch stripe. A tolerance not to exceed 10 percent is allowed for film thickness or yield.
d.Apply glass beads over the wet painted stripes in a uniform pattern at the rate of 6 pounds ( ± 0.1 pound) of beads per gallon of paint. Pressure- apply the beads using a mechanical dispenser mounted not more than 12 inches behind the paint dispenser.
e.Use approved equipment for highway lane striping that is specifically des igned and manufactured for that purpose by a company experienced in the design and manufacture of such equipment. Minimum requirements include the capability of striping two 4- inch yellow centerlines and one 4- inch white edge line simultaneously. Apply mar kings with clear -cut edges, true and smooth alignment, and uniform film thickness.
2.Preformed Marking Tapes (PMT). Apply the PMT material as directed by the manufacturer by either the inlay or overlay method. Use the inlay method whenever new asphalt concrete is placed. Use the overlay method to apply markings to existing pavement. Store all PMT materials between 60 °F and 85 °F for at least 24 hours prior to installation. During installation, maintain field stockpiles at the required storage temperature. For the inlay method, embed the pavement markings in the asphalt concrete surface with a conventional steel wheeled roller. Apply when the surface temperature of the mat is the warmest possible without deforming the marking. The minimum allowable surface temperature, taken within 3/8 inch of the top of the mat, is 140 °F.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 483–486 of 584.