Section 7CFR 1755900.docx

Section 7CFR 1755900.docx

《Section 7CFR 1755900.docx》由会员分享，可在线阅读，更多相关《Section 7CFR 1755900.docx（40页珍藏版）》请在冰豆网上搜索。

Section7CFR1755900

[CodeofFederalRegulations]

[Title7,Volume11]

[RevisedasofApril1,2002]

FromtheU.S.GovernmentPrintingOfficeviaGPOAccess

[CITE:

7CFR1755.900]

TITLE7--AGRICULTURE

CHAPTERXVII--RURALUTILITIESSERVICE,DEPARTMENTOFAGRICULTURE

PART1755--TELECOMMUNICATIONSSTANDARDSANDSPECIFICATIONSFORMATERIALS,EQUIPMENTANDCONSTRUCTION--TableofContents

Sec.1755.900RUSspecificationforfilledfiberopticcables.

（a）Scope

.

（1）Thissectioncoverstherequirementforfilledfiberopticcablesintendedforaerialinstallationeitherbyattachmenttoasupportstrandorbyanintegratedself-supportingarrangement,forundergroundapplicationbyplacementinaduct,orforburiedinstallationseitherbytrenchingorbydirectplowing.

（i）Theopticalwaveguidesareglassfibershavingdirectly-appliedprotectivecoatings,andarecalled``fibers'',herein.Thesefibersmaybeassembledineitherloosefiberbundleswithaprotectivecoretube,encasedinseveralprotectivebuffertubes,orintightbuffertubes.

（ii）Fillers,strengthmembers,corewraps,andbeddingtapesmaycompletethecablecore.

（iii）Thecoreorbuffertubescontainingthefibersandtheintersticesbetweenthebuffertubes,fillers,andstrengthmembersinthecorestructurearefilledwithasuitablematerialtoexcludewater.

（iv）Thecablestructureiscompletedbyanextrudedoverallplasticjacket.Thisjacketmayhavestrengthmembersembeddedinit,insomedesigns.

（v）Buriedinstallationrequiresanarmorundertheouterjacket.

（vi）Forself-supportingcabletheouterjacketmaybeextrudedoverthesupportmessengerandcablecore.

（2）Thecableisfullycolorcodedsothateachfiberisdistinguishablefromeveryotherfiber.Abasiccolorschemeoftwenty-fourcolorsallowsindividualfiberidentification.Coloredtubes,binders,threads,stripings,ormarkingsprovidefibergroupidentification.

（3）Cablemanufacturedtothissectionmustdemonstratecompliancewiththequalificationtestingrequirementstoensuresatisfactoryend-useperformancecharacteristicsfortheintendedapplications.

（4）OpticalcabledesignsnotspecificallyaddressedbythissectionmaybeallowedifacceptedbyRUS.Justificationforacceptanceofamodifieddesignmustbeprovidedtosubstantiateproductutilityandlongtermstabilityandendurance.

（5）AllcablessoldtoRUSborrowersforprojectsinvolvingRUSloanfundsunderthissectionmustbeacceptedbyRUSTechnicalStandardsCommittee``A''（Telephone）.Forcablesmanufacturedtothespecificationofthissection,alldesignchangestoanaccepteddesign

mustbesubmittedforacceptance.RUSwillbethesoleauthorityonwhatconstitutesadesignchange.

（6）TheAmericanNationalStandardInstitute/InstituteofElectricalandElectronicsEngineers,Inc（ANSI/IEEE）,1993NationalElectricalSafetyCode（NESC）referencedinthissectionisincorporatedbyreferencebyRUS.ThisincorporationbyreferencewasapprovedbytheDirectoroftheFederalRegisterinaccordancewith5U.S.C.552（a）and1CFRpart51.CopiesofANSI/IEEE1993NESCareavailableforinspectionduringnormalbusinesshoursatRUS,room2845,U.S.DepartmentofAgriculture,Washington,DC20250-1500orattheOfficeoftheFederalRegister,800NorthCapitolStreet,NW.,suite700,Washington,DC.CopiesareavailablefromIEEEServiceCenter,445Hoes

Lane,Piscataway,NJ08854,telephonenumber1（800）678-4333.

（7）AmericanSocietyforTestingandMaterialsSpecifications（ASTM）A640-91,StandardSpecificationforZinc-CoatedSteelStrandforMessengerSupportofFigure8Cable;ASTMB736-92a,StandardSpecificationforAluminum,AluminumAlloy,andAluminum-CladSteelCableShieldingStock;ASTMD1238-90b,StandardTestMethodforFlowRatesofThermoplasticsbyExtrusionPlastometer;ASTMD1248-84（1989）,StandardSpecificationforPolyethylenePlasticMoldingand

ExtrusionMaterials,ASTMD1535-89,StandardTestMethodforSpecifyingColorbytheMunsellSystem;ASTMD3349-86,StandardTestMethodforAbsorptionCoefficientofCarbonBlackPigmentedEthylenePlastic;ASTMD4565-90a,StandardTestMethodsforPhysicalandEnvironmentalPerformancePropertiesofInsulationsandJacketsforTelecommunications

WireandCable;ASTMD4566-90,StandardTestMethodsforElectricalPerformancePropertiesofInsulationsandJacketsforTelecommunicationsWireandCable;ASTMD4568-86,StandardTestMethodsforEvaluatingCompatibilityBetweenCableFillingandFloodingCompoundsandPolyolefinCableMaterials;andASTME29-90,StandardPracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications,referencedinthissectionareincorporatedbyreference

byRUS.TheseincorporationsbyreferenceswereapprovedbytheDirectoroftheFederalRegisterinaccordancewith5U.S.C.552（a）