C. ANSI C Electrical Analog Indicating Instruments. E. ANSI C Guide for Transformer through Fault Duration.

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1 SECTION DISTRIBUTION SWITCHBOARDS PART 1 GENERAL 1.01 SECTION INCLUDES A. Main switchboard RELATED SECTIONS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. B. Section / Supplemental Mechanical and Electrical General Requirements REFERENCES A. ANSI/NFPA 70 - National Electrical Code. B. ANSI/IEEE C Code for Electricity Metering. C. ANSI C Electrical Analog Indicating Instruments. D. ANSI C Instrument Transformers. E. ANSI C Guide for Transformer through Fault Duration. F. NEMA AB 1 - Molded Case Circuit Breakers and Molded Case Switches. G. NEMA KS 1 - Enclosed Switches. H. NEMA PB 2 - Deadfront Distribution Switchboards. I. NEMA PB Proper Handling, Installation, Operation and Maintenance of Deadfront Switchboards Rated 600 Volts or Less. J. NEMA PB Application guide for Ground Fault Protective Devices for Equipment SUBMITTALS A. Shop Drawings: Indicate front and side views of enclosures with overall dimensions shown; conduit entrance locations and requirements; nameplate legends; size and number of bus bars per phase, neutral, and ground; and switchboard instrument details. B. Product Data: Provide electrical characteristics including voltage, frame size and trip ratings, fault current withstand ratings, and time-current curves of all equipment and components. C. Test Reports: Indicate results of factory production tests. Perform a short circuit study to 208 volt level at the ground floor. The utility shall provide short circuit information and transformer characteristics. The contractor shall assemble DISTRIBUTION SWITCHBOARDS

2 conductor lengths and sizes from the contract drawings. Contractor shall coordinate work with the utility to provide the optimum primary fuse size for the transformer. The utility shall provide thru fault curves, transformer inrush and a time current graph to indicate compliance with ANSI (current edition) OPERATION AND MAINTENANCE DATA A. Maintenance Data: Include spare parts data listing; source and current prices of replacement parts and supplies; and recommended maintenance procedures and intervals REGULATORY REQUIREMENTS A. Conform to requirements of ANSI/NFPA 70. B. Furnish products listed and classified by Underwriters Laboratories, Inc. as suitable for purpose specified and shown DELIVERY, STORAGE, AND HANDLING A. Deliver in 48 inch maximum width shipping splits, individually wrapped for protection, and mounted on shipping skids. B. Handle in accordance with NEMA PB 2.1 and manufacturers' written instructions. Lift only with lugs provided for the purpose. Handle carefully to avoid damage to switchboard internal components, enclosure, and finish. PART 2 PRODUCTS 2.01 MANUFACTURERS A. Square D Company. B. General Electric Corporation. C. Westinghouse Corporation. D. Siemens ITE. E. Substitutions: Under provisions of Section SWITCHBOARD A. Description: NEMA PB 2 with electrical ratings and configurations as indicated on drawings. Provide main and distribution section. B. Distribution Section and Devices: Group mounted, similar to Square D I-Line (117" of breaker mounting space). C. Auxiliary Section Devices: Group mounted. DISTRIBUTION SWITCHBOARDS

3 D. Bus Material: Copper with tin plating, 4,000 amp. E. Bus Connections: Bolted accessible from front for maintenance. F. Ground Bus: Extend length of switchboard. G. Molded Case Circuit Breakers: NEMA AB 1, integral thermal and instantaneous magnetic trip in each pole. Provide circuit breakers UL listed as Type HACR for air conditioning equipment branch circuits. H. Solid-state Molded Case Circuit Breakers: NEMA AB 1, provide with electronic sensing, timing and tripping circuits for adjustable current settings; instantaneous trip; and adjustable short time trip. Provide stationary mounting. Provide kirk key and ground fault zone selective interlocks as indicated. I. Line and Load Terminations: Accessible from the front only of the switchboard, suitable for the conductor materials and sizes indicated. J. Provide metering transformer compartment and metering as indicated on drawings. K. Future Provisions: Fully equip spaces for future devices with bussing and bus connections, suitably insulated and braced for short circuit currents. Provide continuous current rating as indicated. L. Enclosure: NEMA Sections approximately 48"L x 36"W. 2. Switchboard Height: 90 inches excluding floor sills, lifting members, and pull boxes. 3. Finish: Manufacturer's standard light gray enamel over external surfaces. Coat internal surfaces with minimum one coat corrosion-resisting paint, or plate with cadmium or zinc. M. Short Circuit Rating: Integral equipment rating of 100,000 AIC symmetrical at 480 volts AC. N. COMPONENTS 1. Components and Connections: All components shall be front accessible for both installation and maintenance. Phase and neutral terminals shall accept #12 AWG to 750 MCM wire. Ground terminals shall accept wire sizes from #8 AWG to 750 MCM. Ground bus shall be 1/4"x2" copper. No. 8 AWG wire shall be used for all internal connections from the neutral point to ground. Control connections shall be a minimum of #14 gauge. All control wire insulation shall be type SIS. All control wiring shall be labeled at each end. Wiring within the resistor assembly shall be rated for 200 o C service. 2. Structure: The unit shall be free standing and house the resistor bank within an isolated section of the structure. Access to the resistor shall be via a bolted-on cover. The control panel door shall be pad-lockable and the components on the door shall be guarded against accidental contact with energized parts. The rear cover shall be removable. The structure shall provide top and bottom cable entry points. Lifting angles shall be provided to facilitate the installation of the unit. The structure shall be suitable for moving on rollers and shall be skidded for shipment in a manner suitable for handling by a fork lift. All steel parts (except for plated parts) shall be thoroughly cleaned and phosphatized prior DISTRIBUTION SWITCHBOARDS

4 PART 3 EXECUTION AVITA BRUNSWICK to the application of the light gray ANSI No. 61 finish. A pocket shall be located on the inside of the control compartment door to store drawings and manuals. 3. Factory Assembly and Tests: The system shall be completely assembled, wired, and tested at the factory in accordance with NEMA and UL requirements. A certified production test report shall be shipped with the unit EXAMINATION A. Verify that location as indicated on drawings is ready for switchboard installation PREPARATION A. Provide concrete housekeeping pad as shown on drawings INSTALLATION A. Install switchboard in locations shown on Drawings in accordance with manufacturer's written instructions and NEMA PB 2.1. B. Tighten accessible bus connections and mechanical fasteners after placing switchboard. C. Install fuses in each switch FIELD QUALITY CONTROL A. Inspect completed installation for physical damage, proper alignment, anchorage, and grounding. B. Measure insulation resistance of each bus section phase to phase for one minute each, at test voltage of 1000 volts; minimum acceptable value for insulation resistance is 2 megohms. C. Check tightness of accessible bolted bus joints using calibrated torque wrench. D. Physically test key interlock systems to insure proper function ADJUSTING A. Adjust all operating mechanisms for free mechanical movement. B. Tighten bolted bus connections in accordance with manufacturer's instructions. C. Adjust circuit breaker trip and time delay settings to values provided by the Engineer CLEANING A. Touch up scratched or marred surfaces to match original finish. DISTRIBUTION SWITCHBOARDS

5 *** END OF SECTION *** DISTRIBUTION SWITCHBOARDS

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