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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

DIVISION 3 CONCRETE CAST- IN -PLACE CONCRETE GENERAL RELATED DOCUMENTS Drawings and general provisions, apply to work of this section. SCOPE: Furnish labor, materials, equipment and incidentals necessary to complete all job-placed concrete mixes. QUALITY ASSURANCE: "Specifications for Structural Concrete for Buildings", ACI 301, latest edition, and "Building Code Requirements for Reinforced Concrete", ACI 318, latest edition, are hereby made a part of this specification and shall apply to all work under this section, except as amplified or modified herein. Allowable tolerances for flat work shall be such that depressions do not exceed 1/8" under a 10' straight edge; allowable tolerances for form work shall be no more than 1/8" in 4'. All exposed work shall be of uniform color and free of voids. All material shall be stored in an acceptable manner to prevent contamination and damage. PRODUCTS: MATERIALS: Portland Cement: ASTM C150, Types I, II, III. Fine Aggregates: ASTM C33, except as specified herein; washed natural silica sand or manufactured sand or combination thereof; 100% of fine aggregate must pass a #4 sieve. Coarse Aggregates: ASTM C33, except as specified herein; crushed stone or gravel, free from thin elongated or laminated pieces, soluble salts, organic and other deleterious matter, maximum size not to exceed 1/5 of the narrowest dimension between forms or larger than ¾ of the minimum clear spacing between reinforcing bars; maximum size not to exceed 1" in any dimension without special permission of the Architect.

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Water: Clean, free from injurious amounts of oil, acid, alkali, salt, organic or other deleterious matter. Reinforcing Bars: ASTM A615, Grade 60, clean and free from rust, scale or coating that will reduce bond. A thin coating of firmly attached rust will not be cause for rejection. Accessories: Spacers, chairs, bolsters and other devices necessary for proper spacing, placing, supporting and fastening reinforcement in place; Richmond Screw Anchor Company, Inc., or equal by Heckmann, Redhead or Diamond of General Cable; all per ACI 315; galvanized or plastic tipped where legs will be exposed in finished concrete surfaces. Curing Compound per ASTM C309, Type 1: "Sure-Cure" for treatment made by Kaufman Products, Inc., Baltimore, Maryland; "Kure-N-Seal" by Sonneborn Chemical Products, "Eucocure" by Euclid, or equal. Epoxy Grout shall be used in anchoring mistakenly omitted or misplaced anchor bolts and rebars into hardened concrete. Epoxy grout shall be a three component system consisting of epoxy resin, hardener and quartz aggregate filler. Approved equal to "EUCO #456 Epoxy Mortar" as manufactured by the Euclid Chemical Co., "Brutem MPG" as manufactured by Master Builders, or "Kelibond" by Kelken-Gold, Inc., South Plainfield, New Jersey. Bonding Compound: Approved equal to "Mark-25.3 Bonding Agent" as manufactured by Poly-Carb, Inc., Parkman, Ohio 44080, "Armatec 110" by Sika Corp., Lyndhurst, NJ 07071, " Sonobond" by Sonneborn, or equivalent by Euclid or Kaufman Products. Surface Bonding Cement; Approved equal to "Surewall" bonding cement as manufactured by W. R. Bonsal Co., "Thoro Surface Bonding Cement" by Thoro Systems Products or "Tamoseal" by Tamms Industries Co. Self-Leveling Epoxy Patch: Cement based, pourable underlayment patching material approved equal to "Sonoflow" by Sonneborn, :Flo-Top" by Euclid or "Self-Leveling Underlayment" by W. R. Bonsal Co. CONCRETE MIXES: Concrete shall have a minimum 28-day compressive strength of 3,500 psi. All concrete, unless otherwise noted herein, shall have a slump of 2" to 4. The maximum water soluble chloride ion present at age 28 days in the concrete, by weight of cement, shall not exceed 0.30% . All concrete that has the potential of being exposed to cycles of freezing and thawing or the application of deicer chemicals shall have a total air content of 6% (+/-1.5%). 2

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EXECUTION: CONSTRUCTION OF FORMS: Construct forms of form plywood or other good quality sound surface material. Build form square, to lines and dimensions indicated, plumb and straight and sufficiently tight to prevent leakage; securely brace and shore forms to prevent displacement or movement during placing of concrete. Before placing reinforcing steel, all removable forms shall be coated with an acceptable form coating material that will effectively prevent absorption of moisture, prevent bond with the concrete and not stain the concrete surfaces. FORMED SURFACES: All surface defects within concrete walls shall be repaired immediately after form removal. All unsound concrete surrounding honeycombed areas shall be removed. All defective areas, including tie holes, shall be patched with a cement grout made to match the adjacent concrete. All exposed concrete formed surfaces shall have a smooth, rubbed finish produced only newly hardened concrete no later than the day following form removal. Surfaces shall be wetted and rubbed with carborundum brick or other abrasive until uniform color and texture are produced. Unless otherwise noted, provide smooth, even ¾" chamfer on all exposed concrete edges. PLACING REINFORCEMENT: Reinforcement shall be placed, as specified on drawings. Reinforcement shall be clean and securely tied in place. Support reinforcement with concrete blocks or galvanized steel chairs. PLACING CONCRETE: Before placing concrete, all equipment for mixing, transporting and placing shall be clean, and all debris shall be removed from spaces to be occupied by concrete. Mechanically vibrate concrete to insure maximum consolidation and to avoid honeycombing. Thoroughly work concrete around reinforcement and embedded items, and into corners of forms. Temperature of concrete as placed and maintained during the protection and curing period shall be between 50 degrees F and 90 degrees F.

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FINISHING OF FLATWORK: All slab surfaces shall be true planes within 1/8" in 10' as determined by a 10' straight edge placed anywhere on the slab in any direction. Slabs having low spots in excess of the tolerances specified shall be leveled using the self-leveling epoxy patch specified. Floated Finish: All floor surfaces shall first receive a float finish followed by the appropriate final finish as specified in the following paragraph. After the concrete has been placed, consolidated, struck off, and leveled, the concrete shall not be worked further until ready for floating. Floating with a hand float or with a bladed power trowel equipped with float shoes, or with a powered disc float shall begin when the water sheen has disappeared and when the surface has stiffened sufficiently to permit the operation. During or after the floating, planeness of surface shall be checked within a 10 ft. straight-edged applied at not less than two different angles. CURING AND PROTECTION: Beginning immediately after placement, concrete shall be protected from premature drying, excessively hot and cold temperatures and mechanical injury, and shall be maintained with minimal moisture loss at a relatively constant temperature for the period necessary for hydration of the cement and hardening of the concrete. Seal the slab surface and edges with curing compound as specified. Quantities and application shall be in strict accordance with manufacturer's recommendations and instructions. END OF SECTION

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DIVISION 16 ELECTRICAL WORK SECTION 16010 GENERAL PROVISIONS GENERAL RELATED DOCUMENTS Drawings and general provisions, apply to work of this section. DESCIPTION OF WORK Work included: The work of this Division comprises the furnishing and installing of all labor, materials, equipment, and accessories required for the completion of all electrical work shown or called for on the drawings and as specified herein, including but not limited to: Provide all cabling for generator; transfer switches; service feeder and emergency feeder. Provide standby diesel generator; base tank; weather proof sound attenuated enclosure; transfer switches; service switchboard and feeders. Branch circuitry for miscellaneous power for generator; control wiring for generator and annunciator panel. Wiring for battery charger and engine jacket water heater. Provide concrete equipment pads. Disconnecting and making safe existing generator feeder. REFERENCE STANDARDS: References herein to any technical society, organization, group or body are made in accordance with the following abbreviations and unless otherwise noted or specified, all work under this Division shall conform to the latest edition as applicable. ANSI ASTM EEI ETL IEEE NEMA NESC NFPA UL American National Standards Institute American Society for Testing Materials Edison Electric Institute Electrical Testing Laboratories, Inc. Institute of Electrical & Electronics Engineers National Electrical Manufacturers Association National Electrical Safety Code National Fire Protection Association Underwriter's Laboratories, Inc. 5

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MATERIALS AND WORKMANSHIP It is the intent of these specifications to establish quality standards for all material and equipment incorporated in the work of this Division. Proper care shall be exercised in handling all equipment and materials herein specified so as not to injure of mar finished surfaces and the work must be acceptable in every respect upon completion. The installation shall be as indicated on the drawings and in accordance with the manufacturer's recommendations as approved by the Engineer. The installation shall be accomplished by workmen skilled in this type of work. MEASUREMENTS AND INSPECTION Measurements for all work to be performed under this Division shall not be obtained by scaling the drawings but taken at the job site and coordinated with adjoining or connecting work. Prior to the commencement of construction, the Contractor shall examine adjoining work upon which his work may be dependent and report in writing to the Engineer any unsatisfactory conditions, errors or deficiencies, and no work shall be proceed until such conditions have been remedied or adjusted to the satisfaction of the Engineer. CODES, LAWS AND REGULATIONS It is intended that all work to be performed under this Division be in compliance with all applicable state laws, codes and regulations governing standards of design, construction, workmanship and material including, but not limited to, the NEC. The Contractor for this Division shall subscribe to these laws and regulations, be responsible for and make adjustments in the work as necessary to cause the work to conform to these requirements. INTENT OF DRAWINGS The drawings are diagrammatic only, intending to show general runs and locations of conduit, equipment, fixtures and specialties, and do not necessarily show all required offsets and details. All work shall be accurately laid out and coordinated with other trades to avoid conflicts and to obtain a neat and workmanlike installation affording maximum accessibility for operation, maintenance, and headroom. The drawings are not intended to be rigid in specific details and where they may be in conflict with requirements of the drawings, applicable codes or ordinances, or with recommendations of the manufacturers of any equipment actually furnished, installed or connected under this Division, the work shall include the making of such adjustments as may be required to cause all such equipment to be installed and connected in 6

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conformance with such codes, ordinances, or recommendations for the safe, proper, and efficient operation of the equipment. SHOP DRAWINGS AND ENGINEERING DATA Complete shop drawings and engineering data on all equipment and materials to be used in the work of this Division shall be submitted for the Engineer's review. The submittals shall be properly identified and referenced as the applicable specification paragraph heading or drawing number which applies, and shall establish that each item meets the requirements of the specifications with regard to dimension, arrangement and other pertinent characteristics. Individual items within each submittal shall be marked accordingly. Submittals shall include complete wiring diagrams, performance, curves, installation instructions and all other applicable information necessary to the proper installation of the equipment. The shop drawings and submittal data will be reviewed only for conformance with the project design concept and compliance with information in the contract documents. The checking of dimensions and 1uantity of materials shall remain the responsibility of the Contractor. Complete submittals on all equipment, devices, and materials identified below shall be provided for the Engineer's review prior to ordering these products. The following table identifies which products require review by the Engineer and the type of submittal information required:

PRODUCTS WHICH REQUIRE SUBMITTALS ITEM WIRE CONDUIT FITTINGS SWITCHBOARD GENERATOR AND ASSOCIATED EQUIPMENT TRANSFER SWITCHES WIREWAYS PULL BOXES TYPE OF SUBMITTAL MANUFACTURER'S DATA MANUFACTURER'S DATA SHOP DRAWINGS SHOP DRAWINGS SHOP DRAWINGS MANUFACTURER'S DATA MANUFACTURER'S DATA

UNDERWRITERS' LABEL AND LISTING

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All electrical apparatus furnished under this Division shall be approved by UL or other recognized testing agency and shall be so labeled or listed where such is applicable. Where custom built equipment is specified and the UL label or listing is not applicable to the complete product, all components used in the construction of such equipment shall be labeled or listed by UL where applicable. WIRING AND ELEMENTARY DIAGRAMS Wiring and elementary diagrams for equipment as shown on the drawings are based on the product of the specified equipment manufacturer and are shown for convenience to aid in estimating the extent of the work involved. The equipment actually installed shall be wired and connected in accordance with the equipment manufacturer's recommendations and conforming to detail in approved wiring diagrams to be furnished by the equipment manufacturer. All equipment so connected shall be made to operate in a safe, proper, and efficient manner. PROTECTION OF WORK AND EQUIPMENT Reasonable care shall be exercised for the protection against damage to all electrical equipment, apparatus, materials, devices, and accessories during the course of construction, through the use of protective coverings, barriers, railings, and similar devices. Protection shall be suitable for the application as approved by the Engineer. Damages resultant from the negligence or lack of protection shall be corrected to the Engineer's satisfaction at no additional cost. PAINTING Except as otherwise specified, all equipment and materials furnished under this Division shall have factory applied finishes. All practical precautions shall be taken to prevent scars, scratches, and damages during shipment, storage and construction, and touch-up shall be made where necessary to repair any scars and scratches. All nameplates bearing descriptive date and all non-ferrous surfaces of materials and equipment shall be left unpainted and clean. Paint metal bollards with a metal primer before applying two coats of yellow paint. OPERATING AND MAINTENANCE INSTRUCTIONS Furnish the Owner's officially designated representative with on-the ­job instructions in the operation and maintenance of all systems and equipment installed. Also, furnish to this representative two loose leaf bound copies, in one or more volumes as required, of instructions, manuals, parts lists, lubrication instructions, diagrams and other applicable published data which will furnish guidance and reference material on the operation, adjustments, maintenance, and repair of the various pieces of equipment. All submittals shall be printed matter and submitted through the Engineer for approval. 8

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TESTING At the completion of the electrical installation and at such time as the Engineer or Owner may direct, the Contractor shall conduct an operating test for approval. All equipment shall be demonstrated to operate in accordance with the drawings and specifications as intended, proving system integrity. The tests shall be conducted in the presence of the Owner, Engineer, or an authorized representative. All instruments, devices, and personnel required for the tests shall be provided by the Contractor, and the Owner will furnish all necessary electrical power. The following tests shall be performed and written reports provided as designated the Engineer: Measure and record voltages at line terminals of the main service equipment and each transfer switch. Measure and record insulation resistance of each generator feeder, service and transfer switch feeder conductor. (Megger test). Perform insulation-resistance test on each conductor with respect to ground and other conductors. Applied potential shall be 1000Vdc for one (1) minute. Other systems tests as specified elsewhere under this Division and written certification of system integrity. Test results shall be recorded on forms to be supplied by the Engineer. END OF SECTION

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DIVISION 16 ELECTRICAL WORK SECTION 16050 BASIC MATERIALS AND METHODS GENERAL RELATED DOCUMENTS Drawing and general provisions, apply to work of this Section. DESCRIPTION OF WORK The work of this Section consists of the furnishing and installing of all basic materials, including all appurtenances required to provide a complete electrical system as intended. CONCRETE WORK All concrete work shall be performed under the direction of the Engineer and shall meet the requirements stipulated and specified under Division 3-Concrete Work. CUTTING AND PATCHING All cutting and patching necessary for the proper installation of work under this Division shall be performed by this Contractor as directed by the Engineer. No structural member shall be cut without specific approval of the Engineer. Reference is hereby made to the conduit sleeves and openings paragraph as specified hereinafter. Where holes through steel beams are required for the passage of conduits, and where such holes are not already provided or are improperly located to suit the needs, this Contractor shall cut the necessary holes only upon the approval of and as directed by the Engineer. These holes shall be true, smooth circles, sawed, drilled or reamed to the smallest practical diameter as near the beam centers as practical. No holes shall be cut through any beam if any other practical and acceptable conduit route is available, and no such hole shall be cut without the express permission of the Engineer. Holes shall not be cut through concrete structural members. Openings, which might offer a hazard to occupants and passersby in the building and grounds, shall be adequately guarded and shall be closed as soon as practical. CONDUIT SLEEVES AND OPENINGS The Contractor shall be responsible for the proper type, location and size of all sleeves and openings, including those required to be structurally framed and similar items

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required for all equipment and wiring installations throughout the project to provide the systems intended. All sleeves, where required, shall be flush with finished wall surface. Openings for conduits passing through smoke walls and fire rated partitions shall be sealed around the perimeter with fire-rated caulking as required to maintain the fire integrity of the wall to the satisfaction of the Engineer. MISCELLANEOUS IRON AND STEEL Furnish and install steel supports, racks, special wire ways and hangers as required to support and provide access to the entire electrical system. Measurements shall be taken on the job and worked out to suit adjoining and connecting work. All work shall be performed by experienced metal-working mechanics. Members shall be straight and true and accurately fitted. Scale, rust and burrs shall be removed. Welded joints shall be ground smooth where exposed. Drilling, cutting and fitting shall be done as required to properly install the work. Members shall be generally welded except that bolting may be used for field assembly where welding would be impractical. All structural steel shall meet the requirements of ASTM A36. All shop fabricated iron and steel work shall be cleaned and dried and given a shop coat of corrosion inhibitive on all surfaces and in all openings and crevices. HANGERS AND SUPPORTS All required hangers, supports, clamps, sleeves, etc., required for the installation of the electrical work are included as a part of the work. All horizontal runs of conduit shall be properly grouped and hung to true alignment using substantial and appropriate hangers, clamps, conduit straps, etc. Hangers and support locations shall be coordinated with work of other trades to avoid conflicts. Hangers and supports shall be placed at intervals not exceeding the spacing recommended by NEC. Wooden dowels and plastic anchors shall not be used. BASIC MATERIALS AND METHODS Wire and strap hangers will not be permitted. Conduit and fittings shall be secured by metal clamps attached to the building structure. Connect the equipment or conduit to the metal clamp using all-thread rod. Conduit shall be supported using pipe clamps. Toggle bolts or lead expansion sleeves shall be used to fasten to masonry and wood screws shall be used to attach to woodwork. 11

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BRANCH CIRCUITS The branch circuit wiring has been designed to utilize the advantages of a multi-wire distribution system and is shown for guidance to the Contractor in performing the work. Changes in the grouping or general routing of branch circuitry may be made, with the approval of the Engineer, provided there is no change in concept and panelboards phases are balanced. The number of conductors in each run of conduit is indicated on the drawings and where there is a conflict between the number of wires indicated and the actual number required by the functional design, the actual requirements shall govern. DESIGNATION OF CIRCUITS AND EQUIPMENT All electrical equipment, circuitry, specialties and systems shall be marked and/ or labeled for identification purposes as indicated on the drawings and as specified herein. All marking shall be consistent with those indicated on the drawings and shall be exclusive of the manufacturers' labels. LABELING Machine engraved, laminated labels will be provided on the exterior surfaces of panelboards, transformers, safety switches, motor controllers, contactors, time switches, terminal cabinets, and other equipment as described in other sections of these specifications. These nameplates shall be engraved laminated plastic with black face and white letters except for equipment serving emergency power system or fire alarm system which shall be red with white letters, with letter heights not less than 3/16". Size of label shall be as required to indicate the following information for the different types of products as follows: The first line of the label shall state the name of the equipment as shown on drawings. The second line shall indicate what circuit serves the equipment. The third line shall indicate the amperage and voltage characteristics of the equipment. The amperage rating of the equipment shall be determined based on the feeder size. The lettering shall be 3/16" high. Labels shall be secured with rivets or chrome plated screws. Labels affixed with adhesive or tape will be rejected. Pull and junction box covers above ceilings will be marked with permanent ink or paint indicating circuits contained within. When boxes serve a special system such as intercom, the name of the system will be indicated on the box cover. Branch circuit conductors shall be color coded in accordance with the NEC. 12

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Electrical conductors within equipment shall be color coded, with each phase being of the same color as the feeder conductor to which connected. All feeders at pull boxes and junction boxes shall be properly identified by means of appropriate wire markers. Remote control wiring shall be identified at point of origin, pull boxes, junction boxes and at all remote control points by the same method. PRODUCTS CABINETS Cabinets for mounting of accessories, terminals, relays, etc., shall be code gauge galvanized steel with flush or surface covers as applicable and with latches and locks to match panelboards. RACEWAYS AND FITTINGS Raceways and fittings shall be galvanized rigid steel conduit, intermediate metal conduit, electrical metallic tubing, rigid nonmetallic conduit, or flexible metal conduit. Galvanized Rigid Steel Conduit: Exterior surface of conduit shall be zinc coated and hotdipped galvanized and shall be meet requirements of both U.L. 6 and ANSI C80.1. Intermediate Metallic Conduit: Manufactured from zinc coated steel and shall be meet requirements of both U.L. 1242 and ANSI C80.1. Electrical Metallic Tubing: Exterior surface of conduit shall be hot-dipped galvanized and shall be meet requirements of both U.L. 797 and ANSI C80.3. Rigid Nonmetallic Conduit: Conduit shall be manufactured from polyvinyl chloride (PVC) schedule 40 and shall meet requirements outlined in NEMA TC2. Flexible Metal Conduit: Conduit shall be manufactured from steel. Fittings such as couplings and connectors shall match the conduit system to which they are attached. Fittings for metal conduit, electrical metallic tubing, and flexible metal conduit shall be manufactured from steel with zinc or cadmium plating. Fittings for galvanized rigid steel and intermediate metal conduit shall be threaded type. Fittings For electrical metallic tubing shall be compression type. Steel set screw type fittings will be acceptable. Die-cast conduit fittings are not acceptable. Conduits entering into the top of transfer switches and switchboard shall have a Myers Hubs with sealing gland on the locknut. WIREWAYS 13

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Wire ways shall be constructed in accordance with UL 8870 for Wire ways, Auxiliary Gutters and Associated Fittings. Every component, including lengths, connectors and fittings shall be UL listed. Hinged covers shall be removable and capable of being reinstalled without tools. Provisions shall be included in the construction to allow converting the hinged cover to a screwed cover without the need for additional parts. It shall also be possible to seal the cover in the closed position with a sealing wire. Ample knockouts shall be provided as required. Wire ways shall be suitable for lay-in conductors. Connector covers shall be permanently attached so that removal is not necessary to utilize the lay-in feature. All sheet metal parts shall be provided with a rust-inhibiting coating and ANSI grey baked enamel finish. All hardware shall be plated to prevent corrosion. All screws installed towards the inside shall be protected by spring nuts or otherwise guarded to prevent wire insulation damage. Wire ways shall be Listed for NEMA 3R used on exterior of building. HANGERS AND SUPPORTS All hangers and supports shall be fabricated and assembled in such a way that they will not be disengaged by movement of the supported equipment. Hanger rods for support of electrical equipment shall not be less than 3/8" diameter. All channel framing system members, fittings and brackets shall be formed steel with hot-dipped galvanized finish conforming to ASTM A-123 and/or A-153 (galvanized after fabrication. All threaded fasteners, hardware and hanger rods shall have galvanized zinc coating to commercial standards. OUTLET AND JUNCTION BOXES Outlet and junction boxes shall be one piece galvanized construction to suit application in size and function. Boxes shall be sheet steel with knockouts and plaster extension covers as applicable. Cast boxes shall be used in all areas subject to moisture with gasketed covers and flush adapters as applicable. Boxes shall be 2 ½" deep. WIRING DEVICES Wiring devices shall be the product of one manufacturer except as otherwise shown. Local switches for control of lighting circuits shall be heavy duty specification grade, full size, composition encloses, AC type rated for 20Amperes, at 120/277 volts. Standard, competitive, residential grade and interchangeable line switches will not be acceptable.

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All single convenience outlets and power receptacles shall be heavy duty devices, back and/or side wired as applicable 3 and 4 wire grounding type, with U shaped slotted ground for straight blades. Devices shall be as specified on the drawings. Acceptable manufactures are: P&S, Leviton and Hubbell. PLATES AND COVERS Plates and covers shall be 302 brushed finish stainless-steel, with openings to suit devices, except that covers in areas subject to moisture shall be gasketed and weatherproof in design as indicated on the drawings. WIRE AND CABLE All wire and cable shall be single conductor copper rated at 600 volts. Conductors No. 10 and small used shall be solid. Conductors No. 8 and larger shall be multiple stranded. All wire and conduit sizes are based on the use of copper conductors with minimum type XHHW insulation. Feeder and service wire shall be XHHW copper, other control wire and branch circuit wire shall be THHN copper. Aluminum wire will not be acceptable. EXECUTION CABINETS Cabinets shall be flush or surface mounted as required, of sizes as indicated or as per code minimums and with covers, complete with trim, latches and locks to match those of the panelboards. Backboards shall be provided for the mounting of all accessories of minimum ¾" plywood and painted to match the cabinet. CONDUIT AND WIRING All wiring shall be installed in threaded rigid metal conduit, intermediate steel, electrical metallic tubing (EMT), rigid nonmetallic conduit or flexible metal conduit, subject to the restrictions of the NEC and the requirements herein specified. Conduit shall be installed as a complete system without wire. Ends of all conduits shall be plugged or taped promptly upon installation and remain sealed until wiring is installed. Coordinate the routing of conduit with other trades to avoid conflicts with structural members, pipe, ductwork, and other job conditions. Keep conduit at least 6 inches away from parallel runs of flues and steam or hot water pipes.

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There shall not be more than four 90 degree bends in any conduit run; and where more than four turns are required between outlets, they shall be made in standard outlet boxes or pull boxes. All pull boxes shall be readily accessible and shall be located as directed by the Engineer. The interior of all conduits must be free from burrs or cutting edges of any kind, and the threads shall be brought butt to butt in the center of the couplings. Conduits run in finished spaces shall be installed concealed unless specifically indicated to be exposed on the drawings. Exposed conduits shall be properly grouped and installed parallel with walls, ceilings, and floor lines. Ninety degree elbows larger than one inch shall be accomplished using factory made elbows. Field made bends and offsets shall be made with an approved hickey or conduit bending machine. Install pull wires in all empty conduits in which wire is to be installed by others. The pull wire shall be plastic having not less than 200 pound tensile strength. Leave not less than 12 inches of slack at each end of the wire. Service Entrance Conduit: All portions of service above grade shall be galvanized rigid steel. The underground portion of the service entrance shall be rigid nonmetallic conduit with a minimum of 3 inches concrete encasement. Conduit installed underground or in floor slabs, either inside or outside of the building, shall be rigid nonmetallic conduit. All rigid nonmetallic conduits shall be transitioned to metallic conduit within 6 inches of penetrating the floor slab. Conduits run in concrete slabs, structural concrete, or in earth fill under concrete slab shall meet the following conditions: No conduit shall be run under or in column footings. Branch circuit conduits run in slabs shall be supported so that the conduit is in the center of the slab. Curved portions of bends shall not be visible above the finished slab. Conduits run in structural concrete shall be run above the bottom reinforcement bars. All conduit runs exposed on the exterior of the building or in areas subject to moisture shall be Schedule 40 galvanized rigid steel conduit with threaded fittings. EMT may be used on the exterior with approved rain-tight fittings. Short sections of flexible metal conduit shall be used for connections to all motors and other equipment subject to vibration. Where exposed to weather or water, liquid-tight conduit shall be used.

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Conduit shall be sized as indicated on the drawings and where sizes are not shown, shall be sized to equal or exceed the minimum requirements of the NEC. All conduit sizes are based on the use of type XHHW copper conductors unless otherwise indicated. Field made bends and offsets shall be made with an approved hickey or conduit bending machine. Changes in direction of ruins shall be made with symmetrical bends or cast metal fittings. Care shall be taken to prevent the lodgment of plaster, dirt, or trash in Conduits and fittings during construction. Clogged raceways shall be entirely freed of any obstructions or shall be replaced. Conduit shall be fastened to all sheet metal boxes and cabinets with two locknuts with insulated bushing. OUTLET AND JUNCTION BOXES All outlet and junction boxes, except where otherwise specified, shall be of type and size applicable for use in the locations shown on the drawings and as required by the NEC. Outlet and junction boxes located in areas subject to moisture shall be of cast metal construction equal to OZ Gedney Type FS. Boxes in other areas, such as office spaces, above ceiling spaces, or in partitions, may be of one piece galvanized construction. END OF SECTION

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DIVISION 16 ELECTRICAL WORK SECTION 16400 SERVICE AND DISTRIBUTION GENERAL RELATED DOCUMENTS: Drawings and general provisions of Contract, including General and Supplementary Conditions, apply to work of this section. DESCRIPTION OF WORK: The work of this section consists of the furnishing and installing of all electrical work for both interior and exterior systems required for the electrical power distribution system as indicated on the drawings and specified herein including all appurtenances required to provide a complete electrical system as intended. PRODUCTS: SWITCHBOARD: Switchboard shall be a General Electric Spectra Series switchboard with a dead front construction utilizing thermal magnetic circuit breakers and shall conform to the requirements established by UL, NEMA, and the NEC. The switchboard shall be UL approved and so labeled for a 208/120V-3P-4W service entrance. The copper bus assembly shall consist of bus structure securely fastened to rigid galvanized mounting pan and arranged to receive breakers as indicated. All bussing, including grounding and neutral busses shall be manufactured from copper. All bussing shall be designed in accordance with UL standards to suit the loading requirements as scheduled and shall be braced to withstand mechanical stresses created by faults of magnitude equivalent to the rating of breakers to be installed. Bus arrangements shall be sequence phased such that adjacent single pole breakers may be connected to opposite phases in such a manner as to allow two and three pole breakers to be installed on any location. Arrangement shall also include double row construction of breakers and allowance for breaker replacement from the front without disturbing adjacent units or main bus connections. Bus and mounting hardware shall be designed so that circuit breakers may be changed or added without additional machining, drilling, or tapping. Bus support shall be properly insulated. Construction shall be such that the bus will not be exposed upon removal of trim. Circuit breakers shall be of quick-make, quick-break, trip free, thermal-magnetic type with characteristics as scheduled. Automatic tripping shall be clearly indicated by the 18

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operating handle assuming a mid-position between on and off. All two and three pole breakers shall have common trip. Branch circuit breakers shall be fully interchangeable without disturbing adjacent units. Provide circuit breakers as show on drawings. The 1200A circuit breaker shall be GE SKHA12 and the 225A circuit breaker shall be GE SFLA225 Switchboard front shall be of cold rolled steel in accordance with gauges required by UL. Trim shall be provided with angle support to engage flange of box and shall be fastened to box by means of clamps which indicate their position from the front. Doors shall be fastened to trim by flush concealed hinges and equipped with flush type, chromium plated, combination catch and lock. Two milled type keys shall be provided with each panel, and all locks shall be keyed alike. Trim shall be equipped with a neat directory frame secured to the inside of the door. Trim shall be properly cleaned and finished with one rust-inhibiting priming coat and a finish coat of light gray enamel, ANSI 61 Switchboard shall be provided with solid neutrals and grounding busses. A 120 VAC heater with thermostat shall be provided within the switchboard to eliminate condensation. Contractor shall provide 120 volt circuit from normal utility source as required. EXECUTION: FEEDERS: Furnish and install conduit and cable feeders of sizes indicated on the riser diagram or otherwise shown on the drawings. Locations shown are approximate only, and any changes in location, offsets, pull boxes, etc., required by the job conditions, shall be made without extra cost to the Owner. GROUNDING: Provide grounding for all electrical equipment, apparatus, and devices, in accordance with the applicable requirements of the NEC and as indicated on the drawings. The grounding conductor shall be solidly connected to all electrical equipment in accordance with code requirements. MISCELLANEOUS: All equipment shall be identified as specified hereinbefore and be properly labeled. All surface mounted equipment shall be mounted on galvanized steel channel to provide an air space behind the equipment.

END OF SECTION 16400

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DIVISION 16 ELECTRICAL WORK SECTION 16440-EMERGENCY GENERATOR SYSTEM GENERAL RELATED DOCUMENTS Drawings and general provisions, apply to work of this section. SCOPE This specification covers requirements for providing a factory built, prototype tested, production tested, field tested, complete and operable standby emergency electric generating system, including all devices and equipment specified herein, shown on the drawings, and/or as required for the service. Materials and equipment shall be new and current, delivered to the site completely wired, tested, and ready for installation. This system shall include the following: An engine-generator set rated 450.0 kW. Engine-generator control console resiliently mounted on the generating set shall include complete engine start-stop control and monitoring system. Starting batteries with battery charger for the engine-generator set. Mounted and loose accessories, control devices, and other equipment as specified herein and/or as shown on drawings. Such other components, transfer switches, accessories, parts, tests, documents, services, as needed to meet the performance requirement of this specification. and

This equipment, including engine-generator set, shall be provided by a single source manufacturer. The emergency electric generating system described herein, including these components, shall be factory built, factory tested, and shipped by this single source manufacturer, so there is one source of supply and responsibility for warranty, parts, and service. This manufacturer shall be a representative within 75 miles who can provide factory trained servicemen, required stock of replacement parts, and technical assistance. The responsibility for performance to this specification includes the entire system and cannot be split up among individual suppliers of components comprising the system, but must be assumed solely by the supplier of the system. The manufacturer shall furnish engine-generator set and transfer switch as defined in this specification. All controls shall be the standard of the manufacturer, who is engaged in the manufacturer of engine-generator sets, transfer switches, and accessories and has them 21

3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

available for sale on the open market. Control parts shall be identified by part numbers of this manufacturer and shall have second source listing where applicable. Control systems that are supplied by a sub-vendor or subcontractor of the vendor and not incorporated within the documentation drawings of the engine-generator manufacturer are not acceptable. The manufacturer shall have printed literature and brochures describing the standard series specified (not a one of a kind fabrication). Unless specified otherwise herein, all performance and other information shall be as on the manufacturer's printed literature. Performance information shall be the result of test procedures in accordance with nationally recognized standards, plus such other procedures that are judged necessary by the manufacturer to insure maximum service reliability for emergency systems. A summary of this information shall be available upon request. Testing: The intent of this specification is to provide equipment of proven reliability and compatibility. Three separate series of tests shall be performed: Factory Prototype Model Tests, Factory Production Model Tests, and Field Tests. Production Model: Before shipment of the equipment, the engine-generator sets shall be tested under rated load and power factor for performance and proper functioning of control and interfacing circuits. PRODUCTS: Basic materials and equipment required for the installation of all systems herein specified shall conform to the applicable paragraphs specified under Section 16050, Basic Materials and Methods, and to the items specified herein. ENGINE GENERATOR SET: General: This system shall include an engine-generator set as represented in the published specifications for that model. The set shall be a Cummins 450 DFEJ rated for 450 kW at 0.8 PF, 60 Hz, 3 phase, 4 wire, 208Y/120 volts on a continuous standby basis. Engine-generator set shall be mounted on a heavy duty steel base to maintain proper alignment between components. Set shall incorporate vibration isolators of the type and quantity as specified by the set manufacturer. Engine: Engine shall be stationary, liquid-cooled, diesel for use with number 2 diesel fuel. Design shall be four cycle. Engine shall be capable of driving the generator of this rating on a continuous standby basis for the duration of normal source interruptions. Fuel injection and valves shall not require adjustment while in service. Engine shall be arranged for direct connection to an alternating current generator. Engine components shall include the following: 22

3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

A 12 volt DC, solenoid electric starter as required by manufacturer. Positive displacement, mechanical full pressure lubrication oil pump, full flow lubrication oil filters with replaceable elements and dipstick oil level indicator. Fuel filter with replaceable element, and an engine driven mechanical positive displacement fuel pump, mounted on the engine. Replaceable dry element air cleaner. Engine speed isochronous electronic governing system to control alternator frequency within 0.25% of rated frequency under steady state load conditions, and capable of parallel operation with load sharing controls. Engine protection devices shall have sensing elements located on the engine to initiate the following preliminary alarms and engine shutdowns: a. low coolant temperature alarm b. low lubrication oil pressure alarm c. high coolant temperature alarm d. low lubrication oil pressure shutdown e. high coolant temperature shutdown f. over-speed shutdown g. over-crank lockout Provide low coolant shutdown, which shall activate high engine temperature lamp and shutdown. Battery charging alternator, 12 volt DC, with solid-state voltage regulator. Engine mounted thermostatically controlled water jacket heater for the engine to aid in quick starting. Heater shall be rated 800 watts, 120 volts, single phase, 60 Hz. Contractor shall provide proper branch circuit from normal utility power source as required. Coordinate location of power source (spare breakers that are available) with owners representative. Engine cooling system: Engine shall be radiator cooled by engine mounted radiator system including Belt-driven pusher fan, coolant pump, and thermostat temperature control. Performance of components shall be as required by set manufacturer. The contractor shall provide ethylene glycol antifreeze solution to fill engine Cooling system. Engine Exhaust System:

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

Exhaust muffler(s) shall be provided for the engine of size(s) as recommended by manufacturer. Muffler(s) shall be of the critical type. Contractor shall mount muffler so its weight is not supported by the engine. Flexible exhaust connection(s) shall be provided as required for connection between engine exhaust manifold and exhaust line, in compliance with applicable codes and regulations. Provide an exhaust condensation trap with manual drain valve to trap and drain off exhaust condensation and to prevent condensation from entering the engine. Provide a suitable rain cap at the stack outlet. Provide all necessary flanges and special fittings, etc., for proper installation. Contractor shall mount and install all exhaust components as shown on drawings and as required to comply with applicable codes and regulations. All components shall be properly sized to assure proper operation without excessive back pressure when installed as shown on drawings. Make provision as required for pipe expansion and contraction. Engine Fuel System: Contractor shall provide all fuel system piping, which shall be black iron pipe and shall be sized as required for proper fuel flow to engine(s). Provide connections for connecting fuel system to engine in compliance with applicable codes and regulations. Contractor shall provide an integral sub-base fuel storage tank, gauges, valves, tank filler fittings, tank vent fittings, tank float and necessary items to comply with applicable codes and regulations. Tanks shall not be galvanized. The tank shall be 360 degrees double wall construction and carry a UL label for above ground service. The tank coating shall be a coal-tar epoxy coating designed for exterior and interior exposure and corrosion resistance to petroleum products and atmospheric conditions. Provisions shall be incorporated to allow future interstitial monitoring. The tank shall be factory installed as part of the mounting base and shall provide a minimum storage capacity equal to twentyfour (24) hours of unit running time at rated full load. Tanks shall be retested at the job site before being put into service. Motor driven fuel pump(s), shall be provided of sufficient lift and capacity to deliver fuel in excess of maximum fuel consumption rate of engine from the storage tank. A low fuel supply sensing device shall be installed on the fuel tank. The sensing device shall be adjusted to signal low fuel level when the tank contains less than a three (3) hour supply. The three hour supply level shall be as recommended by the manufacturer of the engine-generator set. Generator: 24

3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

Generator shall be single-bearing, self-aligning, four-pole, synchronous type, revolving field, with amortisseur windings, with direct drive, centrifugal blower for proper cooling and minimum noise, with temperature compensated solid-state voltage regulator, with brushless rotating rectifier exciter system. No brushes will be allowed. Generator shall be directly connected to engine flywheel housing and driven through a flexible coupling to insure permanent alignment; gear driven generators are not acceptable under this specification. Insulation shall meet NEMA standards for Class F. The maximum temperature rise shall not exceed 100 degrees C at 40 degrees C ambient. Generator design shall prevent potentially damaging shaft currents. The three-phase, broad range, re-connectible generator shall have 12 leads bought out to allow connection by user to obtain any of the available voltages for the unit. Voltage regulator shall be solid-state design and shall function by controlling the exciter magnetic field between stator and rotor to provide no load to full load regulation of rated voltage within 2% during steady-state conditions. The engine-generator set and regulator must sustain at least 250% of rated load at near zero power factor connected to its terminal. The voltage regulator shall be of a design type that is insensitive to severe load induced waveshape distortion from SCR or thyrister circuits such as those used in battery charging (UPS) and motor speed control equipment loads. All other performance criteria shall be equal to the specified equipment. A rheostat shall provide a minimum of 5% voltage adjustment from rated value. The generator, exciter, and voltage regulator shall be designed and manufactured by the engine-generator set manufacturer so that the characteristics shall be matched to the torque curve of the prime mover. This design allows the prime mover to use its fullest power producing capacity (without exceeding it or over compensating) at speeds lower than rated, to transient speed dips. A system that routinely selects a linear-type (straight line) constant volts/hertz characteristics, will not meet this specification. Exciter shall be three-phase, full-wave, rectified, with heavy-duty silicon diodes mounted on the common rotor shaft and sized for maximum motor starting loads. Systems using three-wire solid-state control elements (such as transistors or SCR's) rotating on the rotor shall not be acceptable. Generator design shall be of the self-protecting type. All other generator performance criteria shall be equal to that of the specified equipment. Generator mounted circuit breakers shall be as shown on drawings. Breakers are to be mounted on the unit within the weather proof enclosure.

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

Engine-Generator Set Control Console: Provide a lighted, unit mounted control console that is factory built, wired, tested, and shock-mounted by the generator manufacturer. Control console shall be a rigid metal enclosure, mounted on the generator end of the set, containing all devices as specified herein, shown on the drawings, and as required for described functions. Control console shall include a control section, control panel, and cable termination box. Hinged, frontopening doors shall provide required access to all components; removable top and side panels shall provide required access to load cable entry and terminations. Control wire shall have termination identification on each wire for ease of tracing. Terminal blocks for control wires which run between generator set controls shall have identical terminations on both ends. Identification shall be provided for each device or function and shall be silkscreened white on a background. Metal enclosures shall be chemically treated and painted manufacturer's standard color with black control panels. Engine-generator set control shall include the following: a. 12 volt DC engine monitor including oil pressure gauge, coolant temperature gauge, charge rate ammeter and running time meter. b. A manual selector switch providing three control positions, RUN-STOPAUTOMATIC shall be included on the console. The RUN position shall permit the engine to be started locally at the set; the STOP position shall inhibit engine operation; AUTOMATIC position allows starting from transfer switch equipment. c. The control console shall complete start-stop-remote, two-wire, and 12 volt DC controls which start the engine on closing contact, and stop the engine on opening contact. d. Two independent systems shall be provided to disconnect the starting circuit upon the engine starting. The design shall provide for proper operation if either of these systems malfunctions. e. The control shall provide for automatic engine shut down for the following fault conditions; Over-crank Over-speed Low oil pressure High engine temperature f. Indicator lamps shall be provided to signal the following functions: 1. RUN- indicates start disconnect

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

2. FAULT- indicates Over-crank, Over-speed, High Coolant Temperature, or Low Oil Pressure 3. PRE-LOW OIL PRESSURE- indicates oil pressure is marginally low 4. PRE-HIGH ENGINE TEMPERATURE- indicates engine temperature is marginally high 5. LOW OIL PRESSURE- indicates engine has shutdown because of critically low oil pressure 6. HIGH ENGINE TEMPERATURE-indicates engine has shutdown because of critically high temperature 7. OVERSPEED- indicates engine has shutdown because of excessive r/min 8. OVERCRANK- indicates the starter has been locked out because cranking time was excessive 9. LOW ENGINE TEMPERATURE- indicates engine temperature is marginally low for starting 10. LOW FUEL- indicates fuel supply is marginally low 11. SWITCH OFF(flashing)- indicates control switch is in the "STOP" position g. A fault reset switch shall be provided to clear fault indications and allow restarting of the engine after shutdown faults. The control design shall be such that the fault indication shall remain until reset. The fault indicator memory shall not be dependent on the presence of either A-C or D-C voltage and shall retain the fault status memory even through complete removal and replacement of the starting batteries. The fault reset function shall operate only when the RUNSTOP-REMOTE switch is in the STOP position. h. A potentiometer shall be provided to adjust the voltage 5% from rated value. i. Manual reset exciter field circuit breaker. j. Provide relay contacts (negative ground) for remote indication alarms and shutdowns. k. A locking screwdriver type potentiometer (electronic governor) shall be provided to adjust the speed 2% from rated value. l. AC voltmeter, 250 degree scale, 4-1/2" (114.3mm) flange, 1% switchboard meter.

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

m. AC ammeter, 250 degree scale, 4-1/2" (114.3mm) flange, 1% switchboard meter. n. Four position ammeter phase selector switch to read line current in each phase with off position. o. Frequency meter 55-65 Hz,250 degree scale, 4-1/2" (114.3mm) flange, 1% switchboard meter. p. Running time meter, 4-1/2" (88.9mm) flange, for 9,999.9 maximum reading in hours. q. Output line voltage circuit breaker, thermal-magnetic, molded-case type sized per the manufacturer's recommendations. OUTDOOR WEATHER-PROTECTIVE SOUND ATTENUATING HOUSING: The generator set shall be provided with a sound-attenuated housing Cummins Level 2 Sound Attenated Package which allows the generator set to operate at full rated load in the ambient conditions previously specified. The enclosure shall reduce the sound level of the generator set while operating at full rated load to a maximum of 73 dBA at any location 7 meters from the generator set in a free field environment. Housing configuration and materials used may be of any suitable design which meets application needs, except that acoustical materials used shall be oil and water resistant. No foam materials shall be used unless they can be demonstrated to have the same durability and life as fiberglass. The enclosure shall include hinged doors for access to both sides of the engine and alternator, and the control equipment. Key-locking and padlockable door latches shall be provided for all doors. Door hinges shall be stainless steel. The enclosure shall be provided with an exhaust silencer which is mounted inside of the enclosure, and allows the generator set package to meet specified sound level requirements. Silencer and exhaust shall include a rain cap and rain shield. All sheet metal shall be primed for corrosion protection and finish painted with the manufacturers standard color. All surfaces of all metal parts shall be primed and painted. Painting of hoses, clamps, wiring harnesses, and other non-metallic service parts shall not be acceptable. Fasteners used shall be corrosion resistant, and designed to minimize marring of the painted surface when removed for normal installation or service work.

AUXILIARY EQUIPMENT: Starting Battery: A battery shall be supplied for the engine and shall be mounted in a battery rack within the engine-generator set skid-base. Battery shall be 12 volt DC and

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

composed of one or more 12 volt, heavy duty, starting lead-acid batteries. All necessary battery cables shall be provided. Jacket water heater rated for low ambient, 208 V. Battery Charger: An SCR voltage regulated battery charger with a maximum charge rate of six (6) amp shall be provided for the engine-generator set. Charger shall be (12 volt DC) with float, taper, and equalize charge settings. The charger shall be supplied 120 VAC from the normal source; contractor shall provide circuit as required. The charger shall be mounted within the weatherproof housing. Vibration Isolators: The engine-generator set shall be mounted on vibration isolators either internal or external to the set skid-base. A clock exerciser mounted in the transfer switch shall be furnished to automatically start the engine-generator set at regular intervals and allow it to run for a preset time period, a minimum of 30 minutes per week. The clock shall operate from a 120 VAC, 60 JZ normal power circuit. A 120 VAC heater with thermostat shall be provided within the engine-generator set control panel to eliminate condensation. Contractor shall provide 120 volt circuit from normal utility source as required. A weather protective housing shall be provided to enclose the generator system and control console. The enclosure shall be constructed of heavy gauge, reinforced sheet steel and shall attach to the generator's mounting base and radiator cowling. Easy access shall be maintained to all areas through the use of removable and lockable panels on all sides. AUTOMATIC LOAD TRANSFER SWITCHES: The manufacturer shall supply literature containing diagrams, parts lists and descriptions sufficient for the owner's personnel, or subcontract supplier to install, operate and perform normal maintenance on the equipment. Testing: To provide proven reliability of the system, transfer switch shall be completely tested as follows: 1. Representative production samples of the transfer switch supplied, shall be demonstrable, through tests, the ability to withstand at least 10,000 mechanical operating cycles. An operating cycle shall consist of one (1) electrically operated transfer from normal to emergency and back to normal.

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

2. Transfer switch supplied shall be U.L. listed per Standard 1008. The minimum WCR (Withstand and Closing Current Ratings) shall meet the requirements of U. L. Standard 1008 and shall be obtained without contact welding. Where the line side overcurrent protection is provided by circuit breakers at 208 volts AC or less, the short circuit WCR shall be as follows: TRANSFER SWITCH CONTINUOUS CURRENT RATINGS 1200A 400A WITHSTAND AND CLOSING RATINGS 65,000A RMS 65,000A RMS

Construction: Transfer switches shall be over center operation, double-throw construction, positively electrically and mechanically interlocked by a simple mechanical beam to prevent simultaneous closing (for break before make operation), and mechanically held in both normal and emergency positions. Transfer switches shall be open-transition, quick-break, quick-make operation so that the speed of opening and closing is not controlled by an operator during manual operation. Transfer switches shall provide a center "Programmed Transition" position for manual switching. Transfer switch shall be approved for manual operation under full load by integral mounted, permanently attached, high dielectric, manual operating handles. Manual operating handles, which are normally stored and must be installed for manual operation, do not meet this specification. The electrical operating means shall be a direct-acting, constant force in both directions, bi-directional linear induction motor to provide minimum friction, straight-line switch action. Motor shall be attached directly to the switching mechanism without the use of gears, cams, or other complex mechanical linkage methods. Transfer switch using solenoid operators and relying upon gravity, weights, or momentum for closing in either position do not meet this specification. Transfer switch shall not contain any integral overcurrent devices in the main power circuit, including molded case circuit breakers or fuses. The transfer switch electrical actuator shall have an independent disconnect means to disable the electrical operation during manual switching. Manual operating handles and controls (other than key-operated switches) shall be accessible to authorized personnel only by opening the key-locking cabinet door. Transfer switch with manual operating handles and non-key-operated operated control switches located on the outside of the cabinet do not meet this specification. The transfer switches shall be mounted in a NEMA 3R cabinet enclosure. A 120 VAC heater with thermostat shall be provided within the switchboard to eliminate condensation. Contractor shall provide 120 volt circuit from normal utility source as required. 30

3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

Maximum transfer time in either direction shall be six (6) cycles. Transfer switch shall have transparent protective covers to protect operating personnel during manual operation, and to allow an operator to visually determine that the main contacts are "Open" or "Closed". The Over-voltage and Frequency Sensing control, over-voltage and frequency sensing module, shall be printed circuit board for ease of service. The solid-state over-voltage sensors shall simultaneously monitor all phases of the normal and emergency power sources to provide field adjustable ranges of voltage pickup and dropout and time delays. Frequency sensors shall simultaneously monitor all phases o the normal and emergency power sources to provide field adjustable ranges of frequency pickup and dropout and time delays. The Relay Control, normal source phase loss relays, shall be conventional plug-in industrial control electromechanical relays. Three-phase, non-adjustable normal source loss relay plus time delays (Start ­3.0 to 30 minutes, Stop-non-adjustable 5 minutes, and Transfer- non- adjustable 0.5 seconds). Controls shall signal the emergency power system to start upon signal from normal source voltage sensors. Solid-state time delay start shall avoid nuisance engine-generator set start-ups on momentary voltage dips or interruptions. The transfer switch shall control the engine-generator set to allow the set to start and transfer the load within 10 seconds after a normal source power failure. It shall be the responsibility of the transfer switch supplier to meet this requirement. The controls shall signal the engine-generator set to stop after load re-transfer to the normal source, but shall maintain the availability of the emergency source in the event that the normal source fails shortly after re-transfer. The controls shall allow the enginegenerator set to run unloaded for a cool-down period prior to shutdown. EXECUTION: The complete installation shall be initially started and checked out for operational compliance by factory-trained representative(s) of the engine-generator set manufacturer. The engine lubrication oil and antifreeze, as recommended by the manufacturer for operation under environmental conditions specified, shall be provided by the enginegenerator set supplier. TESTING:

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3 Concrete Stand-By Generator Replacement Roanoke City Maintenance Building

The generator set shall be subjected to the following testing at the factory prior to shipment and again after completion of installation and initial start-up. An artificial load bank shall be utilized for both tests. Load bank testing shall be done at 0.8 P.F. 1. The generator shall be started and operated at 25% of rated load for a period not less than ½ hour, after which the load shall be increased to 50% of rated load and operated for the second ½ hour. 2. The load shall then be increased to 100% and held continuously for a period of not less than two (2) hours. 3. After this three hour period of operation, the machine shall be unloaded and allowed to run under no-load conditions for at least 15 minutes. A full 100% load shall then be suddenly applied and held for a period of not less than 15 minutes. 4. The machine shall be loaded and unloaded (at 100%) in this manner for a minimum of three operations, during which the speed load recovery capabilities o the unit shall be observed and reported. 5. A full written report indicating KW output, voltage, current frequency variations shall be given to the Engineer. The Owner's authorized representatives and the manufacturer's representative who shall validate the report. After generator set installation, the generator set supplier shall conduct a complete operation, basic maintenance, and emergency service seminar for up to 10 persons employed by the facility owner. The seminar shall include instruction on operation of the generator set, normal testing and exercise, adjustments to the control system and emergency operation procedures. The class duration shall be at least 4 hours in length, and include practical operation with the installed equipment. Operators and spare parts manuals shall be provided for all system equipment. The manuals shall include outline, interconnection, wiring, and control drawings accurately describing the equipment provided. Provide ladder logic for all programmable logic controllers in the system. The manufacturer shall maintain model and serial number records of each generator set provided for at least 20 years. WARRANTY: The complete standby electric power system shall be warranted for a period of one year from the date of initial start-up. Multiple warranties for individual components (engine, generator, controls, etc.) will not be acceptable. Satisfactory warranty documents must be provided. This warranty shall be detailed in available written documents. END OF SECTION

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