SECTION ENCLOSED SWITCHES AND CIRCUIT BREAKERS

Transcription

1 SECTION ENCLOSED SWITCHES AND PART 1 - GENERAL 1.1 SUMMARY A. Section includes the following individually mounted, enclosed switches and circuit breakers rated 600V AC and less: 1. Fusible switches. 2. Nonfusible switches. 3. Molded-case circuit breakers. 4. Molded-case switches. 5. Enclosures. 1.2 DEFINITIONS A. GD: General duty. B. GFCI: Ground-fault circuit interrupter. C. HD: Heavy duty. D. RMS: Root mean square. E. SPDT: Single pole, double throw. 1.3 REFERENCES A. International Electrical Testing Association 1. NETA, ATS 1999; Electrical Testing Specifications for Electrical Power Distribution Equipment and Systems B. National Electrical Manufacturers Association 1. NEMA : Enclosures for Electrical equipment (1000V Maximum) 2. NEMA 1-99: Molded Case Circuit Breakers and Molded Case Switches 3. NEMA FU 1-86: Low Voltage Cartridge Fuses 4. NEMA KS 1-01: Enclosed and Miscellaneous Distribution Equipment Switches (600Volts Maximum) 5. NEMA PB : General Instructions for proper Installation, Operation and Maintenance of Panelboards Rated 600 Volts or Less 6. NEMA PB : General Instructions for proper Installation, Operation and Maintenance of Deadfront Distribution Switchboards Rated 600 Volts or Less CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

2 C. Underwriters Laboratories 1. UL 486A: Wire connectors and soldering lugs for use with copper conductors 2. UL 98: Enclosed and Dead-Front Switches. 3. UL 489: Molded-Case Circuit Breakers, Molded-Case Switches, and Circuit-Breaker Enclosures 4. UL 977: Fused Power Circuit Devices 5. UL 1053: Ground Fault Sensing and Relaying Equipment 1.4 SUBMITTALS A. Product Data: For each type of enclosed switch, circuit breaker, accessory, and component indicated. Include dimensioned elevations, sections, weights, and manufacturers' technical data on features, performance, electrical characteristics, ratings, and finishes. 1. Enclosure types and details for types other than NEMA 250, Type Current and voltage ratings. 3. Short-circuit current rating. 4. Features, characteristics, ratings, and factory settings of individual overcurrent protective devices and auxiliary components. 5. Time current curves. 6. Let-through current curves for circuit breakers with current limiting characteristics. 7. Coordination charts, tables and related data. B. Shop Drawings: Wiring Diagrams detailing power, signal, and control wiring and differentiating between manufacturer-installed and field-installed wiring. C. Field quality-control test reports including the following: 1. Test procedures used. 2. Test results that comply with requirements. 3. Results of failed tests and corrective action taken to achieve test results that comply with requirements. D. Manufacturer's field service report. E. Operation and Maintenance Data: For enclosed switches and circuit breakers to include in emergency, operation, and maintenance manuals. In addition to items specified in Division 01 Sections "Closeout Procedures and Operation and Maintenance Data," include the following: 1. Manufacturer's written instructions for testing and adjusting enclosed switches and circuit breakers. 2. Time-current curves, including selectable ranges for each type of circuit breaker. 1.5 QUALITY ASSURANCE A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in the City of Chicago Electrical Code, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use. CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

3 B. Comply with the City of Chicago Electrical Code. C. Product Selection for Restricted Space: Drawings indicate maximum dimensions for enclosed switches and circuit breakers, including clearances between enclosures, and adjacent surfaces and other items. Comply with indicated maximum dimensions. 1.6 DELIVERY, STORAGE AND HANDLING A. Store enclosed switches and circuit breakers indoors in clean and dry space with uniform temperature to prevent condensation. Protect enclosed switches and circuit breakers from exposure to dirt, fumes, water, corrosive substances, and physical damage. B. If stored in areas subject to weather, cover enclosed switches and circuit breakers to protect them from weather, dirt, dust, corrosive substances, and physical damage. Remove loose packing and flammable materials. Install electric heating of sufficient wattage to prevent condensation. C. Deliver in factory shipping cartons. D. Handle enclosed switches and circuit breakers to avoid damage. 1.7 COMPATIBILITY A. All protective devices in new assemblies shall be of the same manufacturer except for special applications of proprietary types to maximize single-source responsibility. B. Protective devices added to existing assemblies shall have compatible interrupting ratings with the existing assembly and shall be of the original manufacturer. If not available, modify or extend the assembly to accept compatible protective devices of same manufacturer as supplied in new assemblies. 1.8 PROJECT CONDITIONS A. Environmental Limitations: Rate equipment for continuous operation under the following conditions, unless otherwise indicated: 1. Ambient Temperature: Not less than minus 22 deg F and not exceeding 104 deg F. 2. Altitude: Not exceeding 6600 feet. 1.9 COORDINATION A. Coordinate layout and installation of switches, circuit breakers, and components with other construction, including conduit, piping, equipment, and adjacent surfaces. Maintain required workspace clearances and required clearances for equipment access doors and panels EXTRA MATERIALS A. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents. 1. Spares: For the following: CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

4 a. Potential Transformer Fuses: Three of each type installed. b. Control-Power Fuses: Three of each type installed. c. Fuses and Fusible Devices for Fused Circuit Breakers: Three of each type installed. d. Fuses for Fusible Switches: Three of each type installed. 2. Spare Indicating Lights: Three of each type installed. PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Manufacturers: Subject to compliance with requirements, provide products by one of the following manufacturers: 1. Eaton Corporation; Cutler-Hammer Products. 2. General Electric Co.; Electrical Distribution & Control. 3. Siemens Energy & Automation, Inc. 4. Square D/Group Schneider. 5. Boltswitch,Inc. 6. Pringle Electrical Mfgr. Co. 2.2 FUSIBLE AND NONFUSIBLE SWITCHES A. Fusible Switch, 600 or 1200 A and Smaller: NEMA KS 1, Type HD, with clips or bolt pads to accommodate specified fuses, lockable handle with capability to accept two padlocks, and interlocked with cover in closed position. B. Nonfusible Switch, 600 or 1200 A and Smaller: NEMA KS 1, Type HD, lockable handle with capability to accept two padlocks, and interlocked with cover in closed position. C. Accessories: 1. Equipment Ground Kit: Internally mounted and labeled for copper and aluminum ground conductors. 2. Neutral Kit: Internally mounted; insulated, capable of being grounded, and bonded; and labeled for copper and aluminum neutral conductors. 3. Auxiliary Contact Kit: Auxiliary set of contacts arranged to open before switch blades open. 2.3 MOLDED-CASE AND SWITCHES A. Molded-Case Circuit Breaker: NEMA AB 1, with interrupting capacity to meet available fault currents. 1. Thermal-Magnetic Circuit Breakers: Inverse time-current element for low-level overloads and instantaneous magnetic trip element for short circuits. Adjustable magnetic trip setting for circuit-breaker frame sizes 250 A and larger. 2. Adjustable Instantaneous-Trip Circuit Breakers: Magnetic trip element with frontmounted, field-adjustable trip setting. CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

5 3. Electronic Trip-Unit Circuit Breakers: RMS sensing; field-replaceable rating plug; with the following field-adjustable settings: a. Instantaneous trip. b. Long- and short-time pickup levels. c. Long- and short-time time adjustments. d. Ground-fault pickup level, time delay, and I 2 t response. 4. Current-Limiting Circuit Breakers: Frame sizes 400 A and smaller and let-through ratings less than NEMA FU 1, RK Integrally Fused Circuit Breakers: Thermal-magnetic trip element with integral limiterstyle fuse listed for use with circuit breaker and trip activation on fuse opening or on opening of fuse compartment door. 6. GFCI Circuit Breakers: Single- and two-pole configurations with 5-mA trip sensitivity. B. Molded-Case Circuit-Breaker Features and Accessories: 1. Standard frame sizes, trip ratings, and number of poles. 2. Lugs: Mechanical style with compression lug kits suitable for number, size, trip ratings, and conductor material. 3. Application Listing: Type SWD for switching fluorescent lighting loads; Type HACR for heating, air-conditioning, and refrigerating equipment. C. Molded-Case Switches: Molded-case circuit breaker with fixed, high-set instantaneous trip only, and short-circuit withstand rating equal to equivalent breaker frame size interrupting rating. D. Molded-Case Switch Accessories: 1. Lugs: Mechanical style with compression lug kits suitable for number, size, trip ratings, and material of conductors. 2. Application Listing: Type HACR for heating, air-conditioning, and refrigerating equipment. 3. Test kit for each type of solid state breaker. 4. Handle extensions. E. Additional accessories: 1. Provide breaker accessories for general operation and maintenance of specified breakers. Include items listed below and items recommended by manufacturer: a. Handle extensions for devices not mounted in panelboards. b. Special adjustment tools. 2. Provide quantities of circuit protective accessories in locations necessary for effective general operation. 2.4 ENCLOSURES A. NEMA AB 1 and NEMA KS 1 to meet environmental conditions of installed location. CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

6 1. Outdoor Locations: NEMA 250, Type 3R. 2. Kitchen Areas: NEMA 250, Type 4X, stainless steel. 3. Other Wet or Damp Indoor Locations: NEMA 250, Type 4. PART 3 - EXECUTION 3.1 EXAMINATION A. Examine elements and surfaces to receive enclosed switches and circuit breakers for compliance with installation tolerances and other conditions affecting performance. B. Proceed with installation only after unsatisfactory conditions have been corrected. 3.2 INSTALLATION A. Comply with applicable portions of NECA 1, NEMA PB 1.1, and NEMA PB 2.1 for installation of enclosed switches and circuit breakers. B. Mount individual wall-mounting switches and circuit breakers with tops at uniform height, unless otherwise indicated. Anchor floor-mounting switches to concrete base. Support enclosures independent from stud partitions. C. Temporary Lifting Provisions: Remove temporary lifting eyes, channels, and brackets and temporary blocking of moving parts from enclosures and components. Provide quantities of the circuit protective devices accessories in locations necessary for the effective general operations of the facility. D. Install new circuit protective devices to existing assemblies when shown on drawings. Rearrange existing circuit protective devices and provide bus extensions, hardware, enclosure modifications, etc., to accomplish the installations. Modify assemblies, directories or add nameplates to match existing. 3.3 IDENTIFICATION A. Identify field-installed conductors, interconnecting wiring, and components; provide warning signs as specified in Division 26 Section "Identification for Electrical Systems." B. Enclosure Nameplates: Label each enclosure with engraved metal or laminated-plastic nameplate as specified in Division 26 Section "Identification for Electrical Systems." 3.4 CONTROL WIRING INSTALLATION A. Install wiring between OCPDs and control/indication devices as specified in Division 26 Section "Conductors and Cables for Electrical Systems." 3.5 ADJUSTING A. Set field-adjustable switches and circuit-breaker trip ranges. B. Adjust operating mechanisms for free mechanical movement. CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND

7 3.6 DEMONSTRATION A. Training: Arrange and pay for the services of factory-authorized service representative to demonstrate OCPDs and train Owner s maintenance personnel. B. Conduct a minimum of one half day of training in operation and maintenance as specified in the Division 01 Sections Closeout Procedures and Demonstration and Training. Include both classroom training and hands on equipment operation and maintenance procedures. C. Schedule training with at least seven days advance notification. 3.7 CLEANING A. On completion of installation, vacuum dirt and debris from interiors; do not use compressed air to assist in cleaning. B. Inspect exposed surfaces and repair damaged finishes. 3.8 CONTRACTOR STARTUP AND REPORTING A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect, test, and adjust field-assembled components and equipment installation, including connections, and to assist in field testing. Report results in writing. B. Prepare for acceptance testing as follows: 1. Inspect mechanical and electrical connections. 2. Verify switch and relay type and labeling verification. 3. Verify rating of installed fuses. 4. Inspect proper installation of type, size, quantity, and arrangement of mounting or anchorage devices complying with manufacturer's certification. C. Perform the following field tests and inspections and prepare test reports: 1. Perform each electrical test and visual and mechanical inspection stated in NETA ATS, Section 7.5 for switches and Section 7.6 for molded-case circuit breakers. Certify compliance with test parameters. 2. Correct malfunctioning units on-site, where possible, and retest to demonstrate compliance; otherwise, replace with new units and retest. END OF SECTION CHICAGO HIGH SCHOOL FOR THE ARTS ENCLOSED SWITCHES AND