Section 7CFR 1755900文档格式.docx
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Section 7CFR 1755900文档格式.docx
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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)
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