LOW VOLTAGE FRONT ACCESSIBLE MAIN SWITCHBOARD

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1 SECTION LOW VOLTAGE FRONT ACCESSIBLE MAIN SWITCHBOARD PART 1 - GENERAL 1.01 General: Provide low voltage main switchboard, complete, as indicated, specified and required per Contract Documents Work In This Section: Principal item includes 480-volt service switchboard Other Applicable Sections: Requirements of Division 1 and Section apply to work of this Section SUBMITTALS A. Procedures: Refer to Division 1. B. Requirements: In addition to the requirements of Section 16050, submittal material shall include six copies of descriptive data for all products and materials including, but not limited to, the following: 1. Descriptive Data: Before final acceptance of the work, Contractor shall deliver to the Architect an Operating and Maintenance Manual in flexible binder and one complete set of sepia transparencies of all shop and circuit drawings, wiring schedules, and one-line overall diagrams of the switchboard. In addition, a copy of the approved system parts List shall be included in each manual. 2. Shop Drawings: Submit drawings and specifications for all parts, components and assemblies under this Section. Submit complete coordination curves for approval. PART 2 - PRODUCTS 2.01 GENERAL A. Main switchboard shall be complete, unitized, integral- assembly, metalenclosed, dead-front, dead-rear, front accessible, indoor type.

2 B. Switchboard shall be General Electric, Westinghouse, or Siemens. C. Ratings: Ratings shall be not less than required by the NEC and not less than indicated on the drawings. Short- circuit current ratings shall be not less than the maximum short-circuit currents available where switchboard is being installed, as herein specified. D. Arrangements: Switchgear shall conform to the arrangements and details indicated on the drawings. E. Coordination: Coordinate all components and their arrangements electrically and mechanically. Coordinate all circuit entrances including method of entrance and connections. F. Design: To withstand the mechanical stresses caused by rough handling during shipping in addition to the electrical and mechanical stresses which will occur during operation. G. Interlocks: Incorporate interlocking, as indicated on the drawings, and as required for the safe operation. All hinged doors shall have locks. H. Assemblies: Assemble, connect and wire switchboard at the factory so that minimal work will be required at the construction site. I. Finish: Thoroughly clean, phosphatize and paint metal surfaces at factory with primer and enamel or lacquer, light gray finish. J. Switchboard Enclosures: Steel assemblies, adequately braced to ensure rigidity and alignment. Sheet steel shall be standard gauge, stretcherleveled. Holes for connecting adjacent sections shall be die-pierced to ensure alignment and provide for future extensions. All bolts, nuts, washers and fittings shall be rustproof metal. Provide adequate space within each enclosure for equipment and cables. K. Busing and Connections: All buses, including neutral, shall be copper or aluminum sized for continuous ratings and braced to withstand short circuit stresses as herein specified. All joints shall be silver-plated and connections shall be made with a minimum of two high-strength bolts with spring washers. Buses shall be supported on high-strength, nonhygroscopic insulators. Suitably sized ground bus shall extend through all sections with cable connectors in each section.

3 L. Identification: Provide engraved nameplate for each circuit breaker stating trip rating and load supplied. Provide breaker frame size and type on nameplate unless readily identifiable without removing switchboard cover. Provide main unit nameplates. Attach nameplates with self tapping screws. M. Auxiliary Wiring: Necessary fuse blocks and terminal blocks within the switchboard shall be furnished when required. All groups of control wires leaving the switchboard shall be provided with terminal blocks with suitable numbering strips. All hardware used on conductors shall have a high tensile strength and an anti-corrosive zinc plating. N. Switchboard shall be provided with adequate lifting means and shall be capable of being rolled or moved into installation position and bolted directly to the floor without the use of floor sills. O. Individual shipping sections shall be designed for bolting together at installation site. All necessary bolting hardware as well as main bus splices shall be supplied between adjacent shipping sections. P. Adequate conduit space shall be provided to meet NEC requirements. Q. All terminals shall be two hole compression type suitable for copper cable of sizes indicated. R. Minimum short-circuit bracing shall be 50,000 AMP unless indicated otherwise on Drawings. S. A-B-C Type Bus Arrangement: Left-to-right, top-to-bottom, and front-torear, as viewed from the front, shall be used throughout. T. Main horizontal bus bars shall be mounted with all three phases arranged in same vertical plane. Provide full capacity neutral. U. All vertical sections shall align rear with depth as shown on Drawings for mounting against wall. V. All circuit breakers, mains and feeders shall be front accessible. Lock-off capability shall be provided on all breakers. W. Cable Supports: Provide brackets in all cable enclosure compartments for cable supports.

4 2.02 MOLDED CASE CIRCUIT BREAKERS A. Breakers with solid-state trip elements shall be equipped with complete with built-in current transformers and flux transfer shunt trip. Breakers shall have easily changed trip rating plugs with trip rating as indicated on the drawings. Rating plugs shall be interlocked so that they are not interchangeable between frames and interlocked such that breaker cannot be latched with rating plug removed. Breaker shall have built-in test points for testing long, short delay, instantaneous and ground fault functions of the breaker by means of a 120-volt operated test kit. B. Breakers rated 1,600 AMP through 3,000 AMP shall be 100% rated. C. Solid-state trip elements shall have independently adjustable long, short delay pickup with adjustable instantaneous pick-up for high magnitude faults. D. Provide test kit capable of testing all breakers 600 AMP and above. E. Provide lock-off for all breakers GROUND FAULT A. Provide ground fault protection on all main breakers with adjustable pickup from 20% of trip rating to 100% of trip rating, but not exceeding 1,200 AMP; ground fault time delay shall be adjustable 0.1 to 0.5 seconds. Provide neutral ground fault current transformer, where required. Supply integral ground trip on all static trip breakers and ground relay on all thermal magnetic breakers TRIP INDICATORS A. Provide ground overcurrent resettable trip indicators for all main breakers through 3,000 AMP frames, equipped with ground fault relaying INSTRUMENTATION A. Provide current transformers, ammeter, ammeter switch and wattmeter for main breakers. Provide voltmeter, potential transformers and voltmeter switch for main bus. Provide test blocks, for portable recording ammeter and voltmeter. Include 4-20 ma transducers for remote indication of 3 phase amperes, 3 phase watts and single phase volts. Contractor, as an option, may furnish a Westinghouse Type IQ microprocessor metering device in lieu of ammeter, ammeter switch, voltmeter, voltmeter switch and wattmeter.

5 B. Power Company Metering: Provide bused metering compartments in accordance with the applicable Utility standards. PART 3 - EXECUTION 3.01 FACTORY ASSEMBLY AND TESTS A. Switchboard shall be completely assembled, wired, adjusted and tested at factory. After assembly, complete switch-board shall be tested for operation under simulated service conditions to assure accuracy of wiring and functioning of equipment LOW VOLTAGE 3.03 SHIPPING A. Main circuits will be given a dielectric test of 2,200 volts for one minute between live parts and ground and between opposite polarities. Wiring and control circuits will be given a dielectric test of 1,500 volts for one minute between live parts and ground. A. Each multi-unit section shall be shipped completely assembled and shall be equipped with shipping angles to permit handling with a crane. Installation work shall be reduced to a minimum INSTALLATION A. Switchboard shall be securely bolted to concrete floor. Shipping sections shall be electrically connected with connectors furnished with the gear CHECK-OUT AND TESTING A. Switchboard manufacturer shall provide breaker and/or fuse coordination curve showing coordination between upstream and downstream overcurrent protective devices. Manufacturer's service representative shall test and set breaker and/or relay trip devices and submit written report. **END OF SECTION**

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