邢唷��>� SX��R��欹�g ��)5bjbjJ扟� MM(� j(� j,"��bb�� 8A,m4 x0p��(��!�#�/�/�/�/�/�/�/$�1��4z�/��$��$�$�/��4 02�(�(�(�$��/�(�$�/�(�(:�-��.��`胐tUv��]%��. �/<0<�x0�. 5&5�.5��.��$�$�(�$�$�$�$�$�/�/'~�$�$�$x0�$�$�$�$��5�$�$�$�$�$�$�$�$�$bY�: SECTION 26 24 19 motor control centerS GENERAL RELATED DOCUMENTS Drawings and general provisions of the Contract, including General Conditions and Division 01 Specification Sections, apply to this Section. SUMMARY This Section specifies the requirements for motor control centers with combination magnetic motor starters. REFERENCE STANDARDS The latest published edition of a reference shall be applicable to this Project unless identified by a specific edition date. All reference amendments adopted prior to the effective date of this Contract shall be applicable to this Project. All materials, installation and workmanship shall comply with the applicable requirements and standards addressed within the following references: ANSI C19 - Industrial Control Apparatus. NEMA ICS 6 - Enclosures for Industrial Controls and Systems. NEMA ICS 2 - Industrial Control Devices, Controllers, and Assemblies. NEMA AB 1 - Molded Case Circuit Breakers. NEMA KS 1 - Enclosed Switches. NEMA PB 1.1 - Instructions for Safe Installation, Operation and Maintenance of Panelboards Rated 600 Volts or Less. SUBMITTALS Product Data: Submit manufacturer抯 product data. Record Documents: Submit dimensioned Drawings showing size, circuit breaker, fusible switch and combination starter arrangement and equipment ratings including, but not limited to, voltage, bus ampacity, integrated short circuit ampere rating. PRODUCTS GENERAL All materials shall meet or exceed all applicable referenced standards, federal, state and local requirements, and conform to codes and ordinances of authorities having jurisdiction. MANUFACTURERS Square D. Eaton. Siemens. MOTOR CONTROL CENTER CONSTRUCTION Motor control centers shall be of the freestanding type complying with the design and function requirements of the Project. Design characteristics shall be as noted in manufacturer抯 submittal data. Provide factory-assembled, dead front, self-supporting motor control center consisting of required vertical sections bolted together to form one rigid assembly. They shall be 90 inches high, 20 inches wide, and 21 inches deep for front-mounted units. Structures shall contain a horizontal wireway at the top, isolated from the horizontal bus and shall be readily accessible through a hinged cover. Adequate space for conduit and wiring to enter the top or bottom shall be provided without structural interference. Compartments for mounting control units shall be incrementally arranged such that not more than 6 size 1 starters for front mounted only can be mounted within each vertical structure. A vertical wireway with minimum of 35 square inches of cross sectional area shall be adjacent to each vertical unit and shall be covered by a hinged door. Wireways shall contain steel rod cable supports. All full voltage starter units through NEMA Size 5 shall be of the drawout type. Draw-out provisions shall include a positive guide rail system and stab shrouds to absolutely ensure alignment of stabs with the vertical bus. Draw-out units shall have a tin-plated stab assembly for connection to the vertical bus. No wiring to these stabs shall extend into the bus compartment. Interior of all units shall be painted white for increased visibility. Units shall be equipped with side-mounted, positive latch pull-apart type control terminal blocks rated 600-volts. Knockouts shall be provided for the addition of future terminal blocks.All control wire to be 14 AWG minimum. All drawout units shall be secured by a spring-loaded quarter turn indicating type fastening device located at the top front of the unit. Each unit compartment shall be provided with an individual front door. Wiring shall be NEMA Class I, Type B. Enclosure shall be NEMA Type 1. Bus shall be copper and braced for maximum available fault current as shown on Drawings. Each structure shall contain a main horizontal copper silver or tin-plated bus, with ampacity shown on the drawings. The horizontal bus shall be rated at 50癈 temperature rise over a 40癈 ambient in compliance with UL standards. Vertical busses feeding unit compartments shall be copper and shall be securely bolted to the horizontal main bus. All joints shall be front accessible for ease of maintenance. The vertical bus shall have a minimum rating of 300 amperes. Isolation of the vertical bus compartment from the unit compartment shall be by means of a full height insulating barrier. This barrier shall be a single sheet of glass reinforced polyester with cutouts to allow the unit stabs to engage the vertical bus. Provide snap-in covers for all unused openings. Provide a 1-inch x � inch copper ground bus through the length of the motor control center. Provide one-half capacity copper neutral bus. All lugs for phase, neutral and ground buses shall be copper or tin-plated copper. Grind steel surfaces smooth, with burrs, sharp edges, welding splatters, loose rust scale and the like totally removed after fabrication. Following this, chemically clean and treat steel work to allow a good bond between the steel surfaces and apply a rust-preventive primer paint. After priming, thoroughly paint the inside and outside with a suitable finish paint. Finish the interior removable back panels with two coats of white, high-gloss enamel. Provide 1/2 gallon each of exterior and interior finish paint for touch-up after field installation. Exterior and interior steel surfaces shall be cleaned and finished with gray enamel over a rust inhibiting phosphatized coating. Color shall be ANSI 61 gray. Motor control center electrical ratings and configurations are shown on the Drawings. Future provisions: Fully equip spaces for future devices with bussing and bus connections, braced for available short circuit currents. Continuous current rating as indicated on Drawings. Provide provision for extension of main horizontal bus. Motor control centers shall be provided with adequate lifting means. MOTOR STARTERS Motor starters shall be minimum Size One combination type equipped with fused switches. Motor starters shall be arranged in the same order as indicated on the Drawings. Motor starters shall be as specified in Section 26 29 14. An operating mechanism shall be mounted on the primary disconnect of each starter unit. It shall be mechanically interlocked with the unit door to prevent access unless the disconnect is in the OFF position. A defeater shall be provided to bypass this interlock. With the door open, an interlock shall be provided to prevent inadvertent closing of the disconnect. A second interlock shall be provided to prevent removal or re-insertion of the unit while on the ON position. Padlocking facilities shall be provided to positively lock the disconnect in the OFF position with from 1 to 3 padlocks with the door open or closed. In addition, means shall be provided to padlock the unit in a partially withdrawn position with the stabs free of the vertical bus. CONTROL POWER TRANSFORMERS Voltage. For each starter, provide a local, single-phase, individual control power transformer with a 480-volt primary and a 120-volt secondary. Fuses. Fuse both primary lines of the transformer and connect to Line 1 and Line 2. Fuse the secondary line leaving transformer terminal X1. Ground the line leaving terminal X2. Use rejection-type fuse clips and RK1 type current limiting fuses on the primaries. Coordinate primary fuses with secondary fuses to clear a faulted transformer but not blow on magnetizing inrush current. Size. Provide manufacturer's standard size transformer unless additional loads are noted on the drawings. CONTROL DEVICES Provide MCC with control devices as shown and as follows: H-O-A Selector Switches. Heavy-duty, oil-tight, maintained contact, with marked nameplate. Pushbutton Units. Heavy-duty, oil-tight, momentary contact, spring return, NO or NC, as shown, with marked nameplate. Indicating Lights. Red (run), Green (stop) LED type for FVNR starters. Control Relays. Industrial control relays with 120-volt, 60-hertz coils standard convertible NO or NC 10ampere, 600-volt contacts and building module feature enabling relay to have up to 12 poles. Phase Loss Protection. This is part of the solid-state overload relays. CONTROL WIRING Wiring. Install and test control and small wiring inside the MCCs at the factory, including control wiring, instrument and relay wiring, secondary leads from instrument transformers, etc. Neatly and carefully install wiring in suitable wiring gutters or conduit, using standard 600-volt switchboard type, stranded copper wire 14 AWG or larger. Identify each wire at terminals by means of permanent, sleeve-type wire markers. Secure wiring from hinged doors and panels to enclosure in a manner to allow ample flexibility in bending. Make wiring continuous from terminal to terminal, without splices. Terminals. Terminate wire on instruments, devices, transformers and terminal blocks by means of ring-tongue type connectors under screws, marked in accordance with the manufacturer's wiring diagram. Locate terminal blocks in readily accessible places. Spare Contacts. Wire spare contacts to suitably identified terminals for external connections and clearly show these connections on shop drawings. Spare Terminals. In addition to specified spare contact terminals, provide six spare terminals on each terminal block provided. FEEDER DEVICES Molded Case Circuit Breakers: Breakers 400-ampere frame and less shall be manufacturer抯 standard industrial construction, bolt-on type, integral inverse time delay thermal and instantaneous magnetic trip. Breakers 225-ampere through 400-ampere shall have continuously adjustable magnetic pick-ups of approximately five to ten times trip rating. Breakers 600-ampere frame and above shall be equipped with solid-state trip complete with built-in current transformers, solid-state trip unit and flux transfer shunt trip. Interrupting capacity shall be as noted on Drawings. EXECUTION FOUNDATION PAD Construct a concrete pad in accordance with Section 03 30 00, Electrical General Provisions. INSTALLATION Installation shall meet or exceed all applicable federal, state and local requirements, referenced standards and conform to codes and ordinances of authorities having jurisdiction. All installation shall be in accordance with manufacturer抯 published recommendations. Anchor assembly to housekeeping pad. Select overload heaters for motor in accordance with manufacturer抯 recommendations for the voltage and full load amperes listed on the nameplate data of each motor actually installed. Adjust operating mechanisms for free mechanical movement. Touch-up scratched or marred surfaces to match original finish. Subsequent to wire and cable connections, energize motor control centers and demonstrate functioning in accordance with manufacturer抯 requirements. Individual motor starters are furnished under Section 20 05 13; however, the installation and all connections are to be done under Division 26, similar to the work performed for motors served from a Motor Control Center. TESTING Subsequent to wire and cable connections, energize motor control centers and demonstrate functioning in accordance with manufacturer抯 requirements. END OF SECTION 26 24 19 MD ANDERSON Project No. XXXXXX MD ANDERSON PROJECT NAME A/E Name Issue Description A/E Project No. Month 00, 0000 麻豆映画 MOTOR CONTROL CENTERS MD Anderson Cancer Center 26 24 19 MS 20250203 PAGE 1 OF NUMPAGES 6 %&'/AI|��A C W � # H � A��DO]��t u ~ � =KU[\cde��Ou�IQRu �uu~Pv��繇黹翦眙磙趑糸趑仔行行许粜粜尚许眙信僚砒判砒排沤古构当北迸排榕h�(h蒢#h酼[h� �hj\h�"�h��hR�h��h�"�h��hz%�h��h��hhR�h��h�2�h�2�h�<�h��F'/A��C W � H � A��DO]��u ~ � =K��gd��gd��gd��gd��gd��KU\e�OR �~Pv��S�� 0?��gd��gd��gd��u��u� S[cd��uu�� `��0?u�� ! 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