1、09-10 26 24 19 - 1 SECTION 26 24 19 MOTOR CONTROL CENTERS SPEC WRITE NOTE: Delete between /_/ if not applicable to project. Also delete any other item or paragraph not applicable to the section and renumber the paragraphs. Motor control centers shall only be considered for projects that have a signi
2、ficant number of across-the-line motor starters. PART 1 - GENERAL 1.1 DESCRIPTION This section specifies the furnishing, complete installation, and connection of motor control centers. 1.2 RELATED WORK /A. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS: Seismic requir
3、ements for non-structural equipment./ B. Section 25 10 10, ADVANCED UTILITY METERING: Electricity meters installed in motor control centers. C. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements and items that are common to more than one section of Division
4、26. D. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring. E. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path for possible ground fault currents. F. Sectio
5、n 26 05 71, ELECTRICAL SYSTEM PROTECTIVE DEVICE STUDY. G. Section 26 29 11, MOTOR STARTERS: Control and protection of motors. 1.3 QUALITY ASSURANCE Refer to Paragraph, QUALIFICATIONS, in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. 1.4 SUBMITTALS A. Submit in accordance with Section
6、26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS. B. Catalog Data: Submit catalog data and information as required to demonstrate that materials conform to the specification requirements. Data shall include features, characteristics, ratings, and settings of all adjustable components. C. Shop Dra
7、wings: 1. Clearly present sufficient information to determine compliance with drawings and specifications. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 19 - 2 2. Include electrical ratings, enclosure type, dimensions, weights, mounting
8、 details, front view, side view, equipment and device arrangement, running overcurrent protection, branch circuit overcurrent protection, wiring diagrams, materials, connection diagrams for each motor control center, and nameplate schedule. 3. For starters: a list of overload sizes for each motor an
9、d / circuit breakers / fuse / sizes. D. Manuals: Two weeks prior to the final inspection, submit four copies of the following to the /Resident Engineer/ /COTR/: 1. Complete maintenance, operating and testing manuals, including wiring diagrams, technical data sheets, including load current, overload
10、relay and settings of adjustable relays, and information for ordering replacement parts: a. Include complete “As Installed“ diagrams that indicate all pieces of equipment and their interconnecting wiring. b. Include complete diagrams of the internal wiring for each piece of equipment, including “As
11、Installed“ revisions of the diagrams. c. The wiring diagrams shall identify the terminals to facilitate installation, maintenance, operation, and testing. d. Instructions for testing and adjusting overcurrent protective devices. E. Certification: Two weeks prior to final inspection, submit four copi
12、es of the following to the / Resident Engineer / COTR /: SPEC WRITER NOTE: Refer to VA Handbook H-18-8 for Seismic Design Requirements. Specify Region of Seismicity, based on location of the equipment so motor control center manufacturers can check/design seismic strength of their equipment. Delete
13、the following paragraph if the motor control center(s) is located outside the seismic zone. 1. Certification from the manufacturer that the motor control center(s) will withstand the design seismic event forces, and that the unit will be fully operational after the design seismic event at the projec
14、t site. 2. Certification by the manufacturer that the motor control centers conform to the requirements of the drawings and specifications. 3. Certification by the contractor that the motor control centers have been properly installed, adjusted, and tested. Provided by IHSNot for ResaleNo reproducti
15、on or networking permitted without license from IHS-,-,-09-10 26 24 19 - 3 1.5 APPLICABLE PUBLICATIONS A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specification to the extent referenced. Publications are referenced in the text
16、by designation only. B. National Electrical Manufacturers Association (NEMA): ICS 1-05 . Industrial Control and Systems: General Requirements ICS 2-05 . Industrial Control and Systems: Controllers, Contactors, and Overhead Relays, Rated 600 volts ICS 6-06 . Industrial Control and Systems: Enclosures
17、 FU 1-02 Low-Voltage Cartridge Fuses 250-03 . Enclosures for Electrical Equipment (1000 Volts Maximum) C. National Fire Protection Association (NFPA): 70-05 National Electrical Code (NEC) D. Underwriters Laboratories, Inc. (UL): 845-05 . Motor Control Centers PART 2 - PRODUCTS 2.1 MOTOR CONTROL CENT
18、ERS A. Factory-assembled motor control centers shall comply with NEC, NEMA, and UL, and as shown on the drawings. B. Motor control centers shall be complete, floor-mounted, dead-front metal-enclosed, free-standing, grounded, indoor type. C. Wiring: The motor control centers shall be NEMA Standard, C
19、lass 1, Type B. D. Ratings: Ratings shall be not less than shown on the drawings. Interrupting ratings shall be not less than the maximum short circuit currents available at the motor control center location, as shown on the drawings / or as calculated as part of the Section 26 05 71, ELECTRICAL SYS
20、TEM PROTECTIVE DEVICE STUDY/. E. Motor control centers shall conform to the arrangements and details of the drawings and to the spaces designated for installation. F. The components and the control wiring shall conform to the approved shop drawings as furnished for the various applicable electrical
21、and mechanical sections of the specifications. G. All steel parts shall be factory-phosphatized, painted with primer, and baked enamel or lacquer finishes, except for ground connections. The paint and finish shall withstand a minimum of 1000 hours salt spray test. H. Vertical Sections: Provided by I
22、HSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 19 - 4 1. Approximately 90 in 2.25 M high, front, and rear line-up, dead-front assembly. Unit shall be designed to permit future additions or rearrangement of units. 2. The structure shall be NEMA-Type r
23、ated (Type 1, Type 3R, or Type 12) as indicated on the drawings or as required per the environment. 3. Spaces within the sections shall be suitable and adequately sized for starters and accessories as indicated on the drawings. 4. Mount the sections on adequate structural steel supports at the facto
24、ry, front, and rear, for the full length of each center. 5. Each space shall have an individual door with hinges and latches for present and future starters. 6. End panels shall be removable to facilitate future additions. 7. All section parts shall be accessible from the front for maintenance rearr
25、angement. 8. Screws in the removable panels shall remain in the panels when the panels are removed. Self-aligning, self-retaining nuts, which are parts of the screw assembly, shall remain intact. 9. The structure shall have a minimum 12 in 300 mm high wireway at the top of each section and a minimum
26、 6 in 150 mm high wireway at the bottom of each section. The wireway shall run the full length of the structure. 10. Each section in the motor control center shall have isolated vertical full height wireways. Vertical wireways shall connect with both the top and bottom horizontal wireways. 11. Each
27、vertical section for starters shall be equipped with all necessary hardware and busing for modular plug-in units to be added or relocated. All unused space shall be covered by hinged doors and equipped to accept future units. 2.2 BUS BARS AND INTERCONNECTIONS A. Horizontal and vertical bus ratings a
28、s shown on drawings; bus bars shall be fully rated. B. Bus shall be tin-plated copper. C. Bus bar joints and interconnection joints shall be plated, constant high-pressure type, with high strength copper-silicon bolts and nuts. D. Vertical bus shall have insulation as follows: 1. High strength polye
29、ster glass or the equivalent. 2. High track-resistance. 3. High impulse and dielectric strength, suitable for withstanding the maximum short-circuit currents. 4. High flame-retardant, self-extinguishing. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
30、,-09-10 26 24 19 - 5 5. Comply with NEMA Standard for 122 F 50 C temperature rise above the ambient temperature. E. A ground bus shall extend across the entire length of the motor control center. F. Bus bars and interconnections shall include provisions to extend the motor control center horizontal
31、bus into additional future vertical sections. G. Provide shutter mechanism to isolate vertical bus when plug-in device is withdrawn. H. Equip future spaces for motor controllers, circuit breakers, and switches with all hardware necessary for the future equipment. SPEC WRITER NOTE: Show on drawings a
32、 schedule of starters with accessories. Also coordinate with mechanical equipment. 2.3 STARTERS A. Product of the same manufacturer as the motor control centers. B. Factory tested, stab-on, draw-out type up through size 4. Size 5 and above require bolted connections. C. Shall conform to the requirem
33、ents in Section 26 29 11, LOW-VOLTAGE MOTOR STARTERS. D. Interchangeable with starter of the same ratings in all of the motor control centers being installed for this contract. Each motor starter shall be provided with a label indicating all of its ratings. SPEC WRITER NOTE: Edit the paragraph below
34、 to conform with project requirements. E. Disconnecting devices shall be / circuit breaker / fused switch / motor circuit protector / type with external operating handle with lock-open padlocking positions and on-off position indicator. /1. Circuit Breakers: a. UL listed and labeled, in accordance w
35、ith the NEC, as shown on the drawings and as specified. b. Bolt-on thermal-magnetic type with a minimum interrupting rating as indicated on the drawings. c. Equipped with automatic, trip free, non-adjustable, inverse time, and instantaneous magnetic trips for 100A or less. The magnetic trips shall b
36、e adjustable from 3x to 10x for breakers greater than 100A frames. Factory setting shall be HI, unless otherwise noted. d. Additional features shall be as follows: 1) A rugged, integral housing of molded insulating material. 2) Silver alloy contacts. 3) Arc quenchers and phase barriers for each pole
37、. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 19 - 6 4) Quick-make, quick-break, operating mechanisms. 5) A trip element for each pole, thermal magnetic type with long time delay and instantaneous characteristics, a common trip bar fo
38、r all poles and a single operator. 6) Electrically and mechanically trip-free. 7) An overload on one pole of a multi-pole breaker shall automatically cause all breaker poles to open./ /2. Fused Switches: a. Quick-make, quick-break type, in accordance with UL 98, NEMA KS 1 and NEC. b. Minimum duty ra
39、ting, NEMA classification General Duty (GD) for 240 V and NEMA classification Heavy Duty (HD) for 480 V. c. Horsepower rated and shall have the following features: 1) Copper blades, visible in the OFF position. 2) An arc chute for each pole. 3) Fuse holders for the sizes and types of fuses specified
40、./ /3. Motor Circuit Protectors: a. UL listed and labeled in accordance with the NEC, and as shown on the drawings. b. Bolt-on type with a minimum interrupting rating as indicated on the drawings. c. Equipped with automatic, adjustable magnetic trip. Magnetic trip shall be adjustable up to 1300% of
41、the motor full load amperes. Protectors shall include a transient override feature for motor in-rush current, and shall be equipped with a push trip test button./ F. Doors for each space shall be interlocked to prevent their opening unless disconnect is open. A “defeater“ mechanism shall be incorpor
42、ated for inspection by qualified personnel. G. Identify each motor controller, circuit breaker, and switch with a separate nameplate of laminated black phenolic resin with white core and engraved lettering not less than 0.25 in 6 mm high. Identify each motor by its number or other designation, which
43、 indicates function fulfilled by the motor. Identify pilot light with ON and OFF designation. 2.4 FEEDER UNITS A. Circuit breaker: shall conform to the applicable portions of Section 26 24 16, PANELBOARDS. B. Fusible Switches: shall conform to the applicable portions of Section 26 29 21, DISCONNECT
44、SWITCHES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-09-10 26 24 19 - 7 SPEC WRITER NOTE: Edit the paragraph below to conform with project requirements. / 2.5 METERS Meters shall be provided as shown on the plans. Meters shall be in accordance w
45、ith Section 25 10 10, ADVANCED UTILITY METERING./ PART 3 - EXECUTION 3.1 INSTALLATION A. Installation shall be in accordance with NEC, written instructions of the manufacturer, and as shown on the drawings. B. Install motor control center on concrete pad as specified in Section 03 30 00, CAST-IN-PLA
46、CE CONCRETE. Bolt the motor control center to the concrete pad. SPEC WRITER NOTE: Edit the paragraph below to conform with project requirements. /C. Comply with mounting and anchoring requirements specified in Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS./ 3.2 ACCEP
47、TANCE CHECKS AND TESTS Perform in accordance with the manufacturers recommendations. Include the following visual and mechanical inspections and electrical tests: 1. Visual and Mechanical Inspection a. Compare equipment nameplate data with specifications and approved shop drawings. b. Inspect physic
48、al, electrical, and mechanical condition. c. Verify appropriate anchorage and required area clearances. d. Verify that fuse and circuit breaker sizes and types correspond to approved shop drawings. e. Use calibrated torque-wrench method to verify the tightness of accessible bolted electrical connect
49、ions, or perform a thermographic survey after energization. f. Confirm correct operation and sequencing of electrical and mechanical interlock systems. g. Clean motor control center. h. Inspect insulators for evidence of physical damage or contaminated surfaces. i. Exercise all active components. j. Verify the correct operation of all sensing devices, alarms, and indicating dev
