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OC Motor Pool and Maintenance Shop <br />PDC Project 23017 Panelboards 26 24 16 - 4 <br />1.Phase Bus Connections: Arranged for sequential phasing of overcurrent protective devices. <br />2.Phase and Neutral Bus Material: Copper. <br />3.Ground Bus Material: Copper. <br />D.Circuit Breakers: Thermal magnetic bolt-on type unless otherwise indicated. <br />E.Provide electronic trip circuit breakers for circuit breaker frame sizes [250]amperes and above. <br />F.Enclosures: <br />1.Fronts: Provide door-in-door trim with hinged cover for access to load terminals and wiring <br />gutters,and separate lockable hinged door with concealed hinges for access to overcurrent <br />protective device handles without exposing live parts. <br />2.Provide clear plastic circuit directory holder mounted on inside of door. <br />2.05 OVERCURRENT PROTECTIVE DEVICES <br />A.Molded Case Circuit Breakers: <br />1.Description: Quick-make,quick-break,over center toggle,trip-free,trip-indicating circuit <br />breakers listed and labeled as complying with UL 489,and complying with FS W-C-375 <br />where applicable;ratings,configurations,and features as indicated on the drawings. <br />2.Interrupting Capacity: <br />a.Provide circuit breakers with interrupting capacity as required to provide the short circuit <br />current rating indicated. <br />b.Fully Rated Systems: Provide circuit breakers with interrupting capacity not less than <br />the short circuit current rating indicated. <br />3.Conductor Terminations: <br />a.Provide compression lugs. <br />b.Lug Material: Copper,suitable for terminating copper conductors only. <br />4.Thermal Magnetic Circuit Breakers: For each pole,furnish thermal inverse time tripping <br />element for overload protection and magnetic instantaneous tripping element for short circuit <br />protection. <br />a.Provide field-adjustable magnetic instantaneous trip setting for circuit breaker frame <br />sizes 100 amperes and larger. <br />5.Electronic Trip Circuit Breakers: Furnish solid state,microprocessor-based,true rms sensing <br />trip units. <br />6.Provide electronic trip circuit breakers for circuit breaker frame sizes larger than 250 <br />amperes. <br />a.Provide the following individually field-adjustable trip response settings: <br />1)Long time pickup,adjustable by setting dial. <br />2)Long time delay. <br />3)Short time pickup and delay. <br />4)Instantaneous pickup. <br />5)Ground fault pickup and delay where ground fault protection is indicated. <br />7.Do not use handle ties in lieu of multi-pole circuit breakers. <br />8.Provide multi-pole circuit breakers for multi-wire branch circuits as required by NFPA 70. <br />9.Provide the following features and accessories where indicated or where required to <br />complete installation: <br />a.Shunt Trip: Provide coil voltage as required for connection to indicated trip actuator. <br />b.Handle Pad-Lock Provision: For locking circuit breaker handle in OFF position. <br />1)Provide handle locks for all breakers serving fire alarm equipment or elevator <br />emergency communication systems.Handle locks shall be Space Age Electronics <br />ELOCK series or approved equal. <br />PART 3 EXECUTION <br />3.01 EXAMINATION <br />A.Verify that field measurements are as indicated. <br />B.Verify that the ratings and configurations of the panelboards and associated components are <br />consistent with the indicated requirements. <br />Docusign Envelope ID: EF9C08D2-5B75-438B-8D6D-8473F81BD7C4