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Transcript
Specification Number: 26 23 00.10 Product Name: LOW VOLTAGE METAL-ENCLOSED DRAWOUT SWITCHGEAR SECTION 26 23 00.10 LOW VOLTAGE METAL-ENCLOSED DRAWOUT SWITCHGEAR *************************************************************** [ ] Indicates an option or a selection is to be made for quantity or applicability. *************************************************************** PART 1 GENERAL 1.01 SUMMARY A. This specification and associated drawings describe Square D Power-Zone III Series 2 low voltage drawout switchgear assembly constructed to ANSI C37.20.1 standards. Low voltage drawout power circuit breakers, Square D type DSII, are described in Section 16410-5 - Low Voltage Drawout Power Circuit Breakers. 1.02 REFERENCES A. ANSI C37.20.1 - Metal-Enclosed Low Voltage Power Circuit Breaker Switchgear. B. ANSI C37.51 - Testing of Metal-Enclosed Low Voltage AC Power Circuit Breaker Switchgear C. NEMA SG-5 D. [UL-1558] 1.03 SYSTEM DESCRIPTION A. The assembly is to be designed for use on a ______ volt [single] [3] phase, ________ wire [50] [60] Hz. system, with ________ amperes symmetrical fault current available. B. Equipment is to be complete from the incoming line connections to the outgoing feeder connections. C. Any items not specifically mentioned but obviously necessary for proper operation are implied in this specification. 1.04 SUBMITTALS A. Computer generated elevation and one-line diagrams shall be generated and submitted for [record] [approval]. B. [Detailed wiring diagrams, computer generated, shall be supplied at time of equipment delivery]. 1.05 QUALITY ASSURANCE A. [Equipment shall be equipped with [service entrance label] [and] [UL1558 label for metal-enclosed low voltage power circuit breaker type switchgear assemblies] when UL recognized components are specified.] PART 2 PRODUCTS 2.01 MANUFACTURERS A. Metal-Enclosed Low Voltage Power Circuit Breaker Switchgear shall be Power-Zone III, Series 2, with type DSII circuit breakers as supplied by the Square D Company. Specify cost additions or deletions for equipment supplied by any other approved manufacturer. 2.02 EQUIPMENT, COMPONENTS, ACCESSORIES AND FABRICATION A. Enclosure 1. Finish shall be medium gray ANSI #49, electro-deposited catalytic urethane paint applied over a rust inhibiting phosphate primer. 2. The enclosure and internal barriers shall be fabricated of steel members in accordance with NEMA and ANSI standards. Steel lifting straps are to be provided with each shipping group to lift the structure from top with a crane. Supply a wooden skid to permit the use of pipe rollers for moving the switchgear to its final location in the building. 3. All vertical sections shall be bolted together. Ventilation openings on the front of the switchgear are to be located in such a way as to preclude the possibility of metal objects being inserted through them and easily contacting energized parts. To barrier operator from escaping gases during an interruption, breakers shall be supplied with a steel front plate. 4. The equipment shall be assembled, adjusted and tested at the factory and shall be sectionalized, if required, for shipping as requested or approved. The largest section is not to exceed ______ inches deep, and ______ wide to enable installation at the job site. 5. The structure is to consist of three basic compartments from front to rear; the front breaker compartment, the center bus compartment, and the rear cable compartment. a. Front Breaker Compartment 1) The front breaker compartment is to contain the drawout circuit breaker elements, each mounted in its own barriered cell. Active or future use cells shall be equipped to accept circuit breaker and contain drawout mechanism and all current carrying parts. Provide each breaker cell with a hinged door equipped with a flush handle and an external trip button. When equipped with a breaker, a double barrier shall exist between operating personnel, the breaker mechanism and live parts. Thus, the breaker can be operated with outer steel door open. 2) Breakers of like frame sizes shall be interchangeable as standard. No special structure bracing shall be required. 3) If breaker protrudes through a hole in the circuit breaker compartment door, shutters shall be provided to shield live parts when circuit breaker is out for service. Also, a steel plate shall be provided for opening in the circuit breaker compartment door to preclude the possibility of foreign objects entering the breaker cell when breaker is removed. b. Center Bus Compartment 1) The bus compartment is to contain the section riser and main cross bus which is to be rated for a 65° C temperature rise per ANSI standards and as demonstrated by design tests. The main cross bus shall be rated for [2000] [3200] [4000] [5000] continuous amperes. All main and riser bus shall be bolted copper. [Bus shall be fully silver plated its entire length, as standard.] [Bus shall be optionally tin plated to provide corrosion resistance in environments that have a high concentration of corrosive agents.] All bus shall be adequately braced to withstand mechanical forces exerted during a short circuit of [65] [100] [150] [200]k amperes rms symmetrical. All contact surfaces at bolted joints shall be fully plated and the joint bolts are to be of high strength grade 5 steel equipped with Belleville type spring washers. Riser bus shall meet industry standard phase-tophase clearance without the use of insulated/isolated bus. All electrical clearances are to be for 600 VAC. 2) [An isolated neutral bus is to be supplied rated at [50] [100] percent of the phase current.] c. Rear Cable Compartment 1) Size the cable compartment to accommodate all incoming and outgoing cable required within each vertical switchgear section. Cable lugs are to be mounted on the [load side] [line side] run-back bus which is extended into this compartment from the bus compartment. Run-back bus for main or feeder breakers to be insulated from the section riser and cross bus. The compartment shall also contain a copper ground bus bolted directly to the switchgear frame. 2) [Extend a neutral run-back into the cable compartment in each main breaker section for connecting the neutral to the ground bus with a removable isolating link.] 3) [Compression type cable lugs suitable for use with [aluminum] [copper] cable are to be supplied as shown on the plans.] 4) [The center bus compartment containing the section riser bus and main cross bus shall be segregated from the rear cable compartment by means of grounded metal barriers. Using plastic covers over bus in lieu of rear barriers is not acceptable.] B. Low Voltage Drawout Power Circuit Breakers 1. Low voltage power circuit breakers shall be Square D type "DSII" as described in Section 16410-5 - Low Voltage Drawout Power Circuit Breakers. C. [Metering Components] 1. [Main Bus] a. Power Logic Instrumentation, metering and control system, including the Power Logic Digitrip 810D trip unit (consult Square D field office or Power Logic headquarters). b. Current transformers: (suitable ratio). c. Potential transformers: (suitable ratio). 2. [Feeder Circuits] a. PowerLogic Instrumentation, including the Power Logic Digitrip 810D trip unit (consult Square D field office or PowerLogic headquarters). b. Current transformers: (Suitable ratio). c. Ammeter: 2% Ammeter and 3-phase selector switch with OFF position. Mount on the "Fixed Meter Panel" between circuit breaker compartments. D. [Accessories] 1. Provide a portable testing and calibration device for the circuit breaker solid state trip unit. 2. Provide a top mounted traveling breaker lifting device. PART 3 EXECUTION NOT USED END OF SECTION