Orange County NC Website
Browse       Search
OC Motor Pool and Maintenance Shop <br />PDC Project 23017 Enclosed Switches and Circuit Breakers 26 28 16.16 - 3 <br />M.Provide insulated,groundable fully rated solid neutral assembly where a neutral connection is <br />required,with a suitable lug for terminating each neutral conductor. <br />N.Provide solidly bonded equipment ground bus in each enclosed safety switch,with a suitable lug <br />for terminating each equipment grounding conductor. <br />O.Enclosures: Comply with NEMA 250,and list and label as complying with UL 50 and UL 50E. <br />1.Environment Type per NEMA 250:As indicated on the drawings. <br />2.Finish for Painted Steel Enclosures: Manufacturer's standard,factory applied grey unless <br />otherwise indicated. <br />P.Provide safety interlock to prevent opening the cover with the switch in the ON position with <br />capability of overriding interlock for testing purposes. <br />Q.Heavy Duty Switches: <br />1.Comply with NEMA KS 1. <br />2.Conductor Terminations: <br />a.Provide mechanical lugs for switch ratings less than 400 amperes. <br />b.Provide compression lugs for switch ratings 400 amperes and above. <br />c.Lug Material: Copper,suitable for terminating copper conductors only. <br />3.Provide externally operable handle with means for locking in the OFF position,capable of <br />accepting three padlocks. <br />2.03 ENCLOSED CIRCUIT BREAKERS <br />A.Description: Units consisting of molded case circuit breakers individually mounted in enclosures. <br />B.Provide products listed,classified,and labeled as suitable for the purpose intended. <br />C.Unless otherwise indicated,provide products suitable for continuous operation under the following <br />service conditions: <br />1.Altitude: Less than 6,600 feet. <br />2.Ambient Temperature: Between 23 degrees F and 104 degrees F. <br />D.Short Circuit Current Rating: <br />1.Provide enclosed circuit breakers with listed short circuit current rating not less than the <br />available fault current at the installed location indicated on the drawings. <br />E.Enclosed Circuit Breakers Used for Service Entrance: Listed and labeled as suitable for use as <br />service equipment according to UL 869A. <br />F.Auxilary Contacts:Suitable for 120v rated control circuit.Contractor is to provide auxilary contacts <br />in any disconnecting means that is downstream from a frequency drive.aux contacts shall be <br />mechanically tied to switching mechanisims and shall provide both a N.O.and N.C.contacts.verify <br />with DIV 23 prior to ordering equipment. <br />G.Conductor Terminations: Suitable for use with the conductors to be installed. <br />H.Provide thermal magnetic circuit breakers for circuit breaker frame sizes less than 250 amperes. <br />I.Provide electronic trip circuit breakers for circuit breaker frame sizes 250 amperes and above. <br />J.Provide insulated,groundable fully rated solid neutral assembly where a neutral connection is <br />required,with a suitable lug for terminating each neutral conductor. <br />K.Provide solidly bonded equipment ground bus in each enclosed circuit breaker,with a suitable lug <br />for terminating each equipment grounding conductor. <br />L.Enclosures: Comply with NEMA 250,and list and label as complying with UL 50 and UL 50E. <br />1.Environment Type per NEMA 250:As indicated on the drawings. <br />2.Finish for Painted Steel Enclosures: Manufacturer's standard,factory applied grey unless <br />otherwise indicated. <br />3.Provide surface-mounted enclosures unless otherwise indicated. <br />M.Provide externally operable handle with means for locking in the OFF position. <br />N.Ground Fault Protection: Where ground-fault protection is indicated,provide system listed and <br />labeled as complying with UL 1053. <br />Docusign Envelope ID: EF9C08D2-5B75-438B-8D6D-8473F81BD7C4