_API_STD_542.PDF

API specifications standardsare published as an aid to procurement of stan-dardized equipment and materials.These specifications are not intended to inhibitpurchasers and producers from purchasing or producing products made to specifica-tions other than API.Nothing contained in any API specification is to be construed as granting anyright,by implication or otherwise,for the manufacture,sale,or use in connectionwith any method,apparatus,or product covered by letiers patent,nor as insuringanyone against liability for infringement of letters patent.API specifications may be used by anyone desiring to do so,and every effort hasbeen made by the Institute to assure the accuracy and reliability of the data con-tained in them.However,the Institute makes no representation,warranty,orguarantee in connection with the publication of API specifications and hereby ex-pressly disclaims any liability or responsibility for loss or damage resulting fromtheir use;for the violation of any federal,state,or municipal regulation with whichan API specification may conflict;or for the infringement of any patent resultingfrom the use of an API specification.Copyrigh1977 American Petroleum InstilueFOREWORDThe object of this publication is to provide a purchase specification to facilitatethe manufacture and procurement of grouped full voltage motor controllers for thestarting,control,and protection of squirrel cage induction motors for petroleum in-dustry service.The specification is limited to motor controllers rated for 600V.This specification requires the purchaser to specify certain details and features.Also,it is recognized that the purchaser may desire to modify,delete,or simplifysections of the specification.It is strongly recommended that such modifications bemade by supplementing this specification rather than by rewriting or by in-corporating sections thereof into another complete specification.Suggested revisions are invited and should be submitted to the director of theRefining Department,American Petroleum Institute,2101 L Street N.W.,Washington,D.C.20037.iGROUPED MOTOR CONTROLLERSPECIFICATION-LOW VOLTAGE(600 VOLTS)SECTION1一GENERAL.1.1 ScopeApplicable state and local regulations and codes asnoted in Appendix B or C.This specification(together with applicable datasheets and job specifications)covers the materials,1.3 Applicationdesign,and fabrication of grouped full voltage,indoorMotor controllers supplied as part of this specifica-or outdoor,magnetic,combination motor controllersprotected with fusible disconnect switch or moldedtion shall meet the requirements of the designated areaclassification in which they are installed.Refer to Ap-case circuit breaker for the supply,control,and protec-pendixes A through D(purchasers data sheets)fortion of squirrel cage induction motors used indetails and specific requirements.petroleum industry service.Should conflicts exist,jobspecifications will govern.1.4 Unusual Service ConditionsMotor controllers designated as suitable for indoor.1.2 Referenced Publicationsoperation shall be furnished with enclosures designedfor both continuous operation and long periods of in-Applicable sections of the latest editions of theactivity in atmospheres that are made corrosive by(1)following standards and codes are part of thistraces of chemicals that may be present in a petroleumspecification unless amended herein or by the dataprocessing plant and(2)environmental conditions ex-forms.isting at the plant site(such as high humidity,insects,rodents,and so forth).The purchaser shall specifyANSIchemicals involved and environmental conditions thatC19.3Industrial Control Apparatus-Generalprevail.C19.4Industrial Control Apparatus-Enclosures designated as suitable for outdoor opera-Enclosurestion shall not require additional protective shelters orC19.5Industrial Control Apparatus-coatings and shall afford adequate protection againstSwitching or Controlling Devicesstorms(rain,snow,or dust),salt-laden air,as well asC19.6Industrial Control Apparatus-the requirements of indoor operation mentionedControl-Circuit Devices and Assembliesabove.The purchaser shall specify enclosure type re.C19.7Industrial Control Apparatus-quired(that is,NEMA 3,3R,or 3S).Controllers and Controller AssembliesC33.30Industrial Control Equipment for Use in1.5 Operating ExperlenceHazardous Location时Where a new design or material that has not beenCINational Electrical Codeproven in service for at least 2 years is offered,pro-NEMAposals shall indicate which parts of the controller areICS-1970 Industrial Controls and Systemsaffected(such as new insulating materials,contactIEEEdesign change,and so forth)and the extent of ex-288Guide for Induction Motor Protectionperience with such parts.NFPA496Purged and Pressurized Enclosures forAmerican National Standards Institute,Inc.,1430 Broadway,NewElectrical EquipmentYork,New York 10018.National Electrical Manufacturers.Association,2101 L Street,N.W.,Washington.D.C.20037.Institute of Electrical and Electronics Engineers,345 East 47thNOTE:A bullet(in the margin indicates a decision may be re-Street,New York.New York 10017.BCan时6R0 ppendise人National Fire Protection Association.470 Atlantic Avenue.Boston,Massachusetts 02210.