DLT 5221-2016 城市电力电缆线路设计技术规定：英文

ICS27.100

P62

RecordNumber：J433-2016

ELECTRICPOWERINDUSTRYSTANDARDOFTHEPEOPLESREPUBLICOFCHINA

P

DL/T5221-2016

ReplaceDL/T5221-2005

TechnicalCodefortheDesign

ofUrbanPowerCables

城市电力电缆线路设计技术规定

IssuedonAugust16，2016ImplementedonDecember1，2016

IssuedbyNationalEnergyAdministrationELECTRICPOWERINDUSTRYSTANDARD

OFTHEPEOPLESREPUBLICOFCHINA

TechnicalCodefortheDesin

g

ofUrbanPowerCables

/

DLT52212016

/

RelaceDLT52212005

p

ChinaPlanninPress

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Beiin2022

jg图书在版编目（CIP）数据

DL/T5221-2016城市电力电缆线路设计技术规定：

英文/国家能源局组织编译.--北京：中国计划出版

社，2022.12

ISBN978-7-5182-1544-7

Ⅰ.①D…Ⅱ.①国…Ⅲ.①城市配电-电力电缆-

输配电线路-设计规范-中国-英文Ⅳ.①TM247-65

中国国家版本馆CIP数据核字（2023）第119808号

ChineseeditionfirstpublishedinthePeoplesRepublicofChinain2016

EnlisheditionfirstublishedinthePeolesReublicofChinain2022

gppp

bChinaPlanninPress

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rd

，，

3FloorCTowerGuohonBuildin

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，，

No.A11Muxidi-BeiliXichenDistrict

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，

Beijing100038

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PrintedinChinabyBeijingHucaisCultureCommunication.CO.LTD.

Ⓒ2016bNationalEnerAdministration

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Allrightsreserved.Nopartofthispublicationmaybereproducedor

，，，，

transmittedinanformorbanmeansrahicelectronicormechanical

yyygp

，，

includinhotocoinrecordinoraninformationstoraeand

gppyggyg

，

retrievalsystemswithoutwrittenpermissionofthepublisher.

，

Thisbookissoldsubecttotheconditionthatitshallnotbwaof

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，，，

tradeorotherwisebelentresoldhiredoutorotherwisecirculated

withoutthepublisherspriorconsentinanyformofblindingorcover

otherthanthatinwhichthisisublishedandwithoutasimilarcondition

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includinthisconditionbeinimosedonthesubseuenturchaser.

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ISBN978-7-5182-1544-7Introduction

，

ThisEnlishversionwhosetranslationwasoranizedb

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ElectricPowerPlanningandEngineeringInstitute.Authorizedby

NationalEnerAdministrationincomliancewithrelevant

gyp

，

proceduresandstipulationsisoneofChinasenergyindustry

standardsinEnglishseries.ThisEnglishversionwas

ublishedbNationalEnerAdministrationinAnnouncement

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〔〕，

2021No.6datedDecember22nd2021.

TheEnlishversionwastranslatedfromtheChinese

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StandardTechnicalCodefortheDesignofUrbanPower

/

CablesDLT52212016.

ThecorihtisownedbNationalEnerAdministration.

pygygy

，

Intheeventofanydiscrepancyintheprocessofimplementation

theChineseversionshallrevail.

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Manythankswouldgotothestafffromrelevantstandard

develomentoranizationsandthosewhohaverovidedenerous

pgpg

assistanceinthetranslationandreviewrocess.

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，

ForfurtherimprovementoftheEnglishversionall

commentsandsuestionsarewelcomeandshouldbeaddressedto

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ElectricPowerPlanningandEngineeringInstitute.No.65Ande

，，，：

roadXichenDistrictBeiin100120China.Websitewww.

gjg

e.

pp

：

Translatinoranizations

gg

，

ShanhaiElectricPowerEnineerinCo.Ltd.

ggg

··

1ElectricPowerPlanning&EngineeringAssociation

，

SUNTHERIndustrDataBenchmarkinCo.Ltd.

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：

Translatinstaff

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，：

ShanghaiElectricPowerEngineeringCo.LtdCAI

，，，，，

LonshenMENGYuLIYuanzeLIYanLIYonxian

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WUXiaodong

：

ElectricPowerPlanninandEnineerinAssociation

ggg

，

GUOYaliSUHonhon

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，：

SUNTHERIndustryDataBenchmarkingCo.LtdLIU

，

JianxiaYETiantian

：

Reviewpanelmembers

DUANSontaoElectricPowerPlanninand

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，

EnineerinInstituteCo.Ltd.

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YINPengElectricPowerPlanningand

，

EnineerinInstituteCo.Ltd.

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JIAJianboElectricPowerPlanninand

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，

EngineeringInstituteCo.Ltd.

YINWeiEastChinaElectricPowerDesin

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，

InstituteCo.Ltd.ofChinaPower

EnineerinConsultinGrou

gggp

LIJianCentralSouthernChinaElectric

，

PowerDesignInstituteCo.Ltd.

ofChinaPowerEnineerin

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ConsultingGroup

DANHanboChinaEnerEnineerinGrou

gyggp

ZheianElectricPowerDesin

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，

InstituteCo.Ltd.

CHENXiaoxianPOWERCHINAFuianElectric

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··

2，

PowerEngineeringCo.Ltd.

ZHOUBoShanhaiUniversitofElectric

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Power

··

3翻译出版说明

本译本为国家能源局委托电力规划设计总院按照有关程序

和规定，统一组织翻译的能源行业标准英文版系列译本之一。

年月日，国家能源局以年第号公告予以公布。

2021122220216

本译本是根据中国计划出版社出版的《城市电力电缆线路设

》/，

计技术规定翻译的著作权归国家能源局所

DLT52212016

。，，。

有在使用过程中如出现异议以中文版为准

本译本在翻译和审核过程中，本标准编制单位及编制组有关

成员给予了积极协助。

为不断提高本译本的质量，欢迎使用者提出意见和建议，并

。

反馈给电力规划设计总院

：

地址北京市西城区安德路号

65

：

邮编

100120

网址：

www.e

pp

本译本翻译单位：

上海电力设计院有限公司、中国电力规划设计协会、北京双

泽维度信息技术有限公司

：

本译本翻译人员

上海电力设计院有限公司：蔡龙晟、孟毓、李源泽、李艳、李永

祥、武晓东

电力规划设计协会：郭亚利、苏红红

：、

北京双泽维度信息技术有限公司刘建霞叶甜甜

：

本译本审核人员

段松涛电力规划设计总院

··

1尹鹏电力规划设计总院

贾江波电力规划设计总院

阴玮中国电力工程顾问集团华东电力设计院有限公司

李健中国电力工程顾问集团中南电力设计院有限公司

但汉波中国能源建设集团浙江省电力设计院有限公司

陈孝湘中国电建集团福建省电力勘测设计院有限公司

周波上海电力大学

··

2NationalEnerAdministration

gy

Announcement

〔〕

2016No.6

AccordintotheNoticeotheNationalEnerAdministration

gfgy

onPrintingandDistributingRegulationsofEnergyIndustry

（）（

StandardizationTrialVersionandImlementinRulesGNJKJ

pg

〔〕），

2009No.52theNationalEnerAdministrationhereb

gyy

（）

arovestoissue144sectorstandardsseetheAnnexsuch

pp

asCodeforConstructionQualityAcceptanceofNuclear

：

PowerConventionalIslandandBalanceoPlantPart8

f

ThermalInsulationandPaintin.The144standardsconsistof75

g

（）

energystandardsindicatedbyNBand69electricpower

（）

standardsindicatedbDL.

y

：

AendixListofIndustrialStandards

pp

NationalEnerAdministration

gy

，

Auust162016

g

··

1：

Aendix

pp

Listofindustrialstandards

StandardReplacedReferenceApprovalImplementation

No.Standardname

codeNo.standardstandarddatedate

……

TechnicalCode

//

DLTfortheDesinofDLT

g

1312016-08-162016-12-01

52212016UrbanPower52212005

Cables

……

··

2Foreword

〔〕

AccordintothereuirementsofDocumentGNKJ2010

gq

No.320issuedbytheNationalEnergyAdministrationofthe

，

PeolesReublicofChina＂NoticeonReleasintheDeveloment

ppgp

andRevisionPlanoftheFirstBatchofEnergyIndustrial

，

Standardsin2010＂thedraftingpanelrevisedTechnicalRule

/

orDesinoUrbanPowerCablesDLT52212005.Durin

fgfg

，

therevisionthepanelhadsummedupthepracticalexperience

inthedesinofurbanowercablesinandoutsideChinaand

gp

collectedcommentsextensively.

：

Thiscodeconsistsof11chaptersand4appendixexGeneral

，，，，

ProvisionsTermsCableRouteCableLainSelectionofCable

yg

，，

ConstructionSelectionandConfigurationofCableAccessories

，

GroundinofMetalSheathorShieldLaerCableSuortsand

gypp

，，

CleatsFireFightingDesignofCablesDesignofOilSupply

SstemofSelfcontainedOilfilledCableandEnvironmental

y

，

Protectionetc.

Thiscodeincludesthefollowingsignificantchangeswith

/：

resecttoDLT52212005

p

1.Changethescopeofapplicationfrom10kV220kVto

；

10kV500kV

2.ReviseaninconsistencwithStandardorDesino

yyfgf

；

CablesofElectricPowerEngineeringGB502172007

3.AddthechaterEnvironmentalProtection.

p

··

1ThiscodereplacesTechnicalRuleforDesignofUrban

/

PowerCablesDLT52212005fromtheimlementation

p

date.

，

ThiscodeisadministeredbytheNationalEnergyAdministration

roosedbtheElectricPowerPlanninandEnineerinInstitute

ppyggg

anddailymanagedbythePowerGridDesignStandardization

TechnicalCommitteeoftheenerindustr.POWERCHINA

gyy

，

ShanhaiElectricPowerEnineerinCo.Ltd.isresonsible

gggp

fortheinterpretationofspecifictechnicalissuesherein.Any

commentsandsuestionsraiseddurintheimlementationof

gggp

thiscodearetobereferredtotheElectricPowerPlanningand

，，

EnineerinInstituteatAndeRoad65XichenDistrict

ggg

，，

BeiinP.R.China100120.

jg

，

Chiefdevelopmentorganizationsparticipatingdevelopment

，

oranizationschiefdraftinstaffsandchiefreviewinstaffsofthis

ggg

：

codeareasfollows

：

Chiefdevelomentoranizations

pg

，

ShanhaiElectricPowerEnineerinCo.Ltd.

ggg

ChinaElectricPowerResearchInstitute

：

Particiatindevelomentoranizations

pgpg

StateGridBeiinElectricPowerEconomicResearch

jg

Institute

GuandonElectricPowerDesinandResearch

ggg

InstituteofChinaEnergyEngineeringCorporation

StateGridShanhaiMunicialElectricPower

gp

Coman

py

CentralSouthernChinaElectricPowerDesign

InstituteofChinaPowerEnineerinConsultin

ggg

··

2GroupCorporation

EastChinaElectricPowerDesinInstituteofChina

g

PowerEnineerinConsultinGrouCororation

gggpp

：

Chiefdraftingstaffs

FANGHaoZHUHongshengZHANGZhenpeng

ZHAOJiankanLUBinMENGYu

g

RAOWenbinZHANGXiaoyingXIAOZhijun

WUQinghuaCHENZeminLVWeiqiang

LIANGHaoOUYANGBenhonZHANGXiaoin

gyg

ZHENGZhiuanJIANGYunMALin

yg

LIUBeiningYUANXiaomingZHUJinglin

MENGShaoxinXIEDonXUWei

g

ZHENGWeiHEXiaomeiTANGLuan

：

Chiefreviewingstaffs

MIAOGuilianGUOYuLIZhizhon

gg

LIYonshuanZHOUKanTANGJian

ggg

JIANGXiaojuanXUPeihongWUJiansheng

ZHAOQuanjiangLIAOYiWUPeihong

FUJieLIXiaofenCUIMinkun

gg

··

3Contents

（）

…………………

1GeneralProvisions1

…………………（）

2Terms2

…………（）

3CableRoute6

（）

…………

4CableLain7

yg

…………………（）

4.1GeneralReuirements7

q

………（）

4.2SelectionofCableLayingMode9

（）

………

4.3DirectBurying11

……（）

4.4CableDuctLain12

yg

…………………（）

4.5CableTunnelLaying15

（）

…………………

4.6CableTroughLaying24

（）

………

4.7BrideLain25

gyg

…………………（）

4.8UnderwaterLaying27

（）

………

4.9VerticalLaying29

（）

/……

4.10CableTerminationPolesTowers30

……………（）

4.11CableTerminationStation30

（）

……

5SelectionofCableConstruction33

（）

…………………

5.1GeneralReuirements33

q

，，

5.2SelectionofInsulationScreenMetalSheaths

……………（）

ArmorsandOuterSheaths35

……（）

5.3CableConductors37

6SelectionandConfiurationofCable

g

…………（）

Accessories40

··

1…………………（）

6.1GeneralRequirements40

………………（）

41

6.2TypesofCableTerminationsandJoints

（）

…

6.3StructuresandTesofCableTerminationsandJoints43

yp

（）

…………

6.4CableTerminationsSuorts46

pp

………………（）

6.5OvervoltageProtection48

………（）

7GroundingofMetalSheathorShieldLayer50

…………（）

8CableSuortsandCleats55

pp

……（）

9FireFihtinDesinofCables57

ggg

（）

…………………

9.1GeneralReuirements57

q

……（）

9.2SelectionofFlameRetardantCables57

9.3FireFihtinDesinofCableRacewaandCable

gggy

………………（）

InterlaerofSubstations57

y

，

9.4FireFightingDesignofCableTunnelCableTrough

………（）

andCableShaft59

10DesinofOilSulSstemofSelf-contained

gppyy

（）

……

Oil-filledCable62

（）

…………

11EnvironmentalProtection65

AppendixACalculationofthePullingForceand

…（）

theSideWallPressure66

AendixBCalculationoftheLenthofCable

ppg

（）

……

DuctWorkinShaft72

g

，

AendixCLateralDislacementThermal

ppp

ExpansionandContractionandAxial

…（）

ForceofSnakeLaying75

AendixDChemicalStabilitofthePlastic

ppy

（）

……

Sheath83

··

2AppendixECorrectionFactorsofPermissible

ContinuousAmacitofCablesUnder

py

……………（）

DifferentLayingConditions86

AendixFAveraeGroundTemeratureof

ppgp

………（）

RepresentativeCitiesinAugust89

AendixGCalculationoftheOilDemandand

pp

TransientOilPressureforOil-filled

（）

……

Cables93

··

31GeneralProvisions

1.0.1Thiscodeisformulatedwithaviewtostandardizin

g

thedesignprinciplesandtechnicalrequirementsforpower

cableswitharatedACvoltageof10kV500kVinurban

areas.

1.0.2Thiscodeisalicabletothedesinofowercables

ppgp

witharatedACvoltageof10kV500kVinurbanareas.

，

1.0.3InadditiontothiscodethedesinofurbanACower

gp

cablesshallcomlwiththerelevantcurrentnationaland

py

industrialstandards.

··

12Terms

2.0.1Directburin

yg

Acablelayingmethodbywhichcablesareplacedin

excavatedtrouhsorrefabricatedtrunksandcoveredwith

gp

protectiveboardortrunkcoverafteracertainthicknessoffine

sandorsoilhasbeenspreadaboveandbelowthecablesalong

thecablerouteandthensoilisbackfilledandcomactedflush

p

withthegroundsurface.

2.0.2Nonbuildinstructures

g

Man-madestructuresthatarenotdesignedorintendedfor

，

continuoushumanoccupancy.Incableengineeringnonbuilding

，，，，

structuresmainlincludecabletrouhsductstunnelsinterlaers

ygy

，

shaftsandworkingshaftsintendedforcablelayingaccessory

installationoroerationandmaintenance.

p

2.0.3Cableduct

Anunderroundstructurewheremultileiesareerectedat

gppp

oneattemtinaccordancewiththelannednumberofcables.

pp

2.0.4Cabletrough

Acablestructurethatisenclosedandcoveredwith

removablecoverslabswhichareflushwithorslightlydeviate

fromtheradelevel.

g

2.0.5Cabletunnel

Afullyenclosedcablestructurewhereanumberofcables

arecontainedandaccessesaremadeavailableforinstallation

··

2andpatrolinspectionofcables.

2.0.6Workinshaft

g

Astructureintendedforoeratorstoinstallointsorull

pjp

cables.

2.0.7Shieldvoltaelimiter

g

Adevicethatisconnectedbetweenthemetalscreenor

，

sheathandearthintendedtolimitthevoltaeofthemetal

g

screenorsheathdurinthetransientsofthesstem.

gy

2.0.8Dry-typecross-linked

Across-linkinrocessthatcansinificantlreducethe

gpgy

moisturecontentinthecross-linkedpolyethyleneinsulted

cable.

2.0.9Parallelearthcontinuousconductor

，

Alow-impedanceconductorlaidalongthecableroute

intendedtosuresstheexternalimactsofmaneticfield

pppg

，

resultinfromthesinle-haseroundinfaultcurrentand

ggpgg

reducetheinducedvoltageoccurringonthemetalscreenor

sheathwhenthemetalscreenorsheathofsinle-corecableis

g

providedwithsinglepointgrounding.

2.0.10Slifixin

pg

Afixinmethodthatallowscablestoexerienceaxialanle

gpg

changeorslighttransversedisplacementattheattachmentpointwhen

thermalexansionandcontractionoccur.

p

2.0.11Rigidfixing

Aclaminfixinmethodbwhichcableswillnotdislace

pggyp

whenthermalexansionandcontractionofcablesoccur.

p

2.0.12Pressuretank

Anoiltankthatisusedtoaccommodatethevolumechaneof

g

··

3oilinoil-filledcables.

2.0.13Oildemand

Oiluantitreuiredtoensurecontinuousoerationofcables

qyqp

withinthespecifiedoilpressurerangewhenthetemperatureof

cableschanes.

g

2.0.14Normaloilpressure

Anoilressureatwhichcablescanoeratesafeland

ppy

continuousl.

y

2.0.15Transientoilpressure

Atemoraroilressurethatarisesasaresultofsudden

pyp

changeinthetemperatureofcables.

2.0.16Snakelain

yg

Acablelainmethodbwhichcablesarelaidintheformofa

ygy

snakeforthepurposeofreducingaxialcablethermalstressand

increasinfreeexansioninaccordancewiththereuirementsof

gpq

uantitativearameters.

qp

2.0.17Offset

Cableslaidintheshaeofanarcatsomelocalsections.

p

Whereoffsetsarearrangedintheworkingshaftsatbothends

，

ofcableductstheareusedtoaccommodatethethermal

y

；

exansionandcontractionofthecablesinthecableduct

p

，

wheretheyarearrangedonlarge-spanbridgestheyareused

toaccommodatetheexansionofcablesresultinfromthe

pg

thermalexpansionandcontractionofthebridgebody.

2.0.18Cross-bondin

g

Asecialconnectionmodeinwhichthemetalscreensor

p

sheathsofadjacentsectionalizedcablesareconnectedinacross

mannersuchthatthecontinuouscircuitofeachmetalscreenor

··

4sheathcansurroundthethree-phaseconductorssuccessively.

2.0.19Circumscribedcirclediameter

Thediameterofthecircumscribedcirclearoundthreecables

arrangedintrefoil.

2.0.20Thermalresistance

Ahsicaluantitdefinedbthethermalohmlawfor

pyqyy

theone-dimensionalheatdispersionprocessusingthethermal

networkanalyticmethodtocalculatetheampacityofcables.

··

53CableRoute

3.0.1Thecablerouteshallcomlwiththeoveralllannin

pypg

ofurbanareasandshallbesubjecttotheapprovalfromthe

，

urbanplanningauthorities.Inadditionitshallbearranged

toetherwithotherielinesandmunicialfacilities.

gppp

3.0.2Thedesinofthecablerouteshallbetechnicall

gy

，，，

feasiblesafesuitableenvironmentallyfriendlyandcost-

effectivebcomrehensivelconsiderinsuchfactorsasthe

ypyg

，

routelenthandtheeaseofconstructionoerationand

gp

maintenance.

3.0.3Nonbuildinstructuresforlaincablesshouldbe

gyg

builtatoneattemtbasedonthelon-termlanninofrids.

pgpgg

3.0.4Thecableductsandtroughsforlayingcablesor

directlyburiedcablesshallnotbelaidrightaboveorbelow

otherielinesinarallel.

ppp

，，

3.0.5Theminimumdistancebetweencablesandcablesies

pp

，

roadsbuildingsornonbuildingstructuresshallbeasspecifiedin

Table5.3.5ofthecurrentnationalstandardStandardorDesin

fg

oCablesoElectricPowerEnineerinGB50217.

ffgg

，，

3.0.6Wherecablescrossriversbridgestunnelsandother

urbanublicfacilitiesshouldbeusedsubecttoarovalof

pjpp

cometentauthorities.

p

··

64CableLain

yg

4.1GeneralReuirements

q

，

4.1.1Regardlessofthecablelayingmodesthebending

radiusofcablesshouldnotbelessthanthevaluesspecifiedin

Table4.1.1.

Table4.1.1Minimumbendingradiusofcables

durinlainandoeration

gygp

Cablesof35kVandbelow

Single-coreThree-coreCablesof66kV

Item

cablescablesandabove

UnarmoredArmoredUnarmoredArmored

Durinlain20D15D15D12D20D

gyg

Durin

g

15D12D12D10D15D

operation

：

NoteDreferstothenominaloutsidediameteroffinishedcables.

4.1.2Theverticaldistancebetweenadacentlaersofcable

jy

，

supportsshallbesufficientforlayingorfixingcableseasily

andconsideringfuturereplacementoradditionalinstallation

，

formultilecableslaidonthesamesuorttheminimumnet

ppp

distancebetweencablesuortsshouldnotbelessthanthe

pp

valuesspecifiedinTable4.1.2.

··

7Table4.1.2Permissibleminimumnetdistancebetweenadacent

j

（）

laersofcablesuortsmm

ypp

CabletesandlainMinimumnetdistancebetween

ypyg

characteristicsadjacentlayersofsupports

Controlcables120

OnecablelaidateachlayerD+50

Morethanonecablelaidateachlayer2D+50

Power

Cablesintrefoil2D+50

cables

Morethanonecircuitofcablesintrefoil3D+50

CableslaidintrunksH+80

：

Notes1Hreferstotheouterheihtoftrunks.

g

2Dreferstothenominaloutsidediameteroffinishedcables.

/

4.1.3Thenetdistancebetweenthefloorceilinandcable

g

，

supportsthatareinstalledincabletroughstunnelsorinterlayers

shouldnotbelessthanthevaluessecifiedinTable4.1.3.

p

Table4.1.3Minimumnetdistancebetweencablesuorts

pp

/（）

andfloorceilinmm

g

LainlocationVerticalnetdistancetofloorVerticalnetdistancetoceilin

ygg

Incabletrouh10150

g

Incabletunnel

10100

orinterlayer

：，

NoteForverticalsnake-laincablestheverticalnetdistancetothefloorshall

yg

comlwiththereuirementsforsnakelain.

pyqyg

，

4.1.4Thenetwidthofaccessesincabletrouhstunnelsor

g

workingshaftsshouldnotbelessthanthevaluesspecifiedin

Table4.1.4.

··

8Table4.1.4Permissibleminimumnetwidthofaccessesin

，（）

cabletrouhstunnelsorworkinshaftsmm

gg

Depthofcabletroughs

Excavatedtunnel

ArranementofNon-excavated

g

orenclosed

600

cablesupportstunnel

≤≥workinshaft

g

6001000

1000

*

Bothsides3005007001000800

*

Singleside300450600900800

：，

Notes1Whenshallowtroughsarenotprovidedwithcablesupportscableaccessis

notnecessar.

y

，

2Forthearranementinnon-enclosedworkinshaftsrefertothatin

gg

cabletrouhs.

g

4.1.5Thelengthofsectionalizedcablesshallbedesigned

takinintoaccounttheermissibleinducedvoltaeofcable

gpg

，，

sheaththemanufacturincaabilittransortationand

gpyp

installationconditions.

，

4.1.6Duringcablelayingthepullingforceandsidewall

ressureofcablesshallnotexceedtheermissiblevalues

pp

secifiedinAendixA.

ppp

，

4.1.7Inenclosednon-buildinstructuresforlaincablessuch

gyg

，，，

astunnelstroughsworkingshaftsandinterlayersthermal

，

iinshallnotbearraned.Inadditioniincontainin

ppggppgg

inflammableasorliuidmustnotentersuchsace.

gqp

4.2SelectionofCableLayingMode

4.2.1Thecablelainmodesshallbeselectedtakininto

ygg

，

accountsuchfactorsastheenineerinconditionsenvironmental

gg

··

9，

characteristicsandcabletypeandquantityaswellasthe

，

reuirementsforreliableoerationeasmaintenanceandtechnical

qpy

andeconomicrationalit.

y

4.2.2Thenumberofcablesapplicabletodifferentlaying

modesshouldbeselectedaccordingtoTable4.2.2.

Table4.2.2Lainmodesandthelannednumberofcables

ygp

LainmodePlannednumberofcables

yg

Directburin6andbelow

yg

Cableductortroughlaying24andbelow

Cabletunnellaying18andabove

4.2.3Thedirectburinmodeshallbeselectedaccordinto

ygg

：

thefollowinreuirements

gq

1Directburinmabeadotedinareasnotsuitablefor

ygyp

，

frequentexcavationorareasunderneathurbansidewalks

，

whereexcavationandreairiseasorareasonedesofroads

pyg

andbuildins.

g

2Directburyingshouldnotbeadoptedinareaswhere

undergroundpipenetworksaredenseorareaswithapotential

ofleakaeoffusedmetalandhih-temeratureliuidorareas

ggpq

suscetibletofreuentexcavationfordeveloment.

pqp

3Directburyingshallnotbeadoptedinsoilsexposedto

chemicalcorrosionorstracurrentcorrosion.

y

4.2.4Iftherearealarenumberofcableswhilereeated

gp

，

excavationisnotfeasiblecableductlaincanbeselected.

yg

4.2.5Cabletroughlayingshallnotbeselectedinareaswith

leakaeofchemicalcorrosiveliuidorhih-temeraturefused

gqgp

metal.

··

104.2.6Cabletunnellayingshallbeselectedaccordingtothe

：

followinreuirements

gq

1Thenumberofcablesissolarethatitexceedsthe

g

，

appropriatenumberofcablesforcableductsandtroughs

cablestunnelsshallbeadoted.

p

2Inareaswithleakageoffusedmetalandhigh-

，

temeratureliuidcablestunnelsshouldbeadoted.

pqp

，

3For500kVcablescabletunnelsshouldbeadoted.

p

4.3DirectBurin

yg

4.3.1Theburialdethofcablesshallcomlwiththe

ppy

：

followinreuirements

gq

1Thedistancefromthetoofcabletotheround

pg

surfaceshallnotbelessthan0.7m.Whencablesarelaid

，

underneathroadwasorfarmlandstheburialdethshallbe

yp

；

aroriatelincreasedandshouldnotbelessthan1.0m

pppy

，

whencablesareledintobuildingscrossunderground

，

buildinsorbassbuildinsthemabeburiedshallowl

gypgyyy

providedthatsuitableprotectivemeasuresaretaken.

，

2Whenlaidinfrozensoilareascablesshouldbeburied

；，

underthefrozensoillaeriftheconditiondoesnotermit

yp

measuresshallbetakentoprotectthecablesfromdamage.

4.3.2Directlburiedcablesshallbecoveredwithfinesand

y

orsoilatleast100mmthickimmediatelyaboveandbelowthe

cablesallalonthecablerouteandthencoveredwitha

g

rotectiveslabextendin50mmfromthecablesoneitherside.

pg

Whencablesarelaidinprefabricatedreinforcedconcrete

，

trunksfinesandorsoilatleast100mmthickshallbelaced

p

··

11，

firstinsidethetrunks.Aftercablesarelaidthetrunksshall

befullfilledwithfinesandorsoilandthencovered.

y

，

4.3.3Inthecaseofdirectburincablesidentification

yg

：

shallcomplywiththefollowingrequirements

1Consicuouswarnintaesshallbelaidonthetoof

pgpp

protectiveslabsortrunklidsallalongthecableroute.

2Consicuousorientationmarksorstakesshallbeset

p

，，

atturninointsointsandentriestobuildinsandalon

gpjgg

thestraightrouteatacertaininterval.Thespacingbetween

suchmarksorstakesshouldnotbelarerthan50m.

g

4.3.4Whendirectlyburiedcablescrossurbantrafficroadsand

，

railwaysprotectivemeasuresshallbetakenappropriately.

4.4CableDuctLaying

4.4.1Thedesinofcableductsshallcomlwiththe

gpy

：

followinreuirements

gq

1Inadditiontothecableductholesrequiredforlaying

，

cablesinaccordancewithlon-termridlanninasuitable

ggpg

numberofspareholesshallbereservedaswell.

2Cableductsusedforlainsinle-corecablesshallbe

ygg

，

madeofnon-maneticandenvironmentall-friendlmaterials

gyy

andthoseforlayingthree-corecablesmaybereinforced

concreteieswithsmoothinnersurfacesoralvanizedsteel

ppg

pipes.

3Thethicknessofoverlainsoilabovethetoofcable

ygp

ductsshouldnotbelessthan0.5m.Whencablesincable

，（），

ductscrossothercablesductstroughsorotherstructures

thedistancetherebetweenshallbeassecifiedinTable5.3.5

p

··

12ofthecurrentnationalstandardStandardforDesignof

CablesoElectricPowerEnineerinGB50217.

fgg

4Theinnerdiameterofacableductshouldnotbe

smallerthan1.5timesthecableoutsidediameterincaseof

onecableorthecircumscribedcirclediameterincaseof

multiplecables.

5Thecableductsshallbemadetobelinearasractical

p

，

asossible.Wherethehavetobeclearofobstaclesthe

pyy

maybemadeinarc-shapedwithanarcradiusbeingnoless

，

than12m.Ifriidductsareemloedthebendinanleat

gpygg

thelocationwheretwoneighboringductsjoinshallnotbe

larerthan2.5°.

g

6Wherecableductsbeardnamicloadsfromtheround

yg

，

surfacethepointswhereneighboringductsjoinmaybe

reinforcedlocallusinreinforcedconcreteorsuorts.

ygpp

4.4.2Theworkinshaftsincableductsshallcomlwith

gpy

：

thefollowingrequirements

1Theintervalbetweenworkinshaftsthatarebuiltfor

g

cableductsmustbecalculatedanddeterminedbasedonboth

thecablewiththereatestweihtandthecablewiththe

gg

minimumermissibleullinforceandsidewallressurein

ppgp

thesamecableduct.Themaximumintervalcanbecalculated

accordintoAendixB.

gpp

2Thelengthofaworkingshaftshallbedetermined

basedonthesizeofthecableointwiththelarestlenththat

jgg

islaidinthisworkinshaftandthesizeoftheoffsetnecessar

gy

foraccommodatingthethermalexpansionandcontractionof

thecableslaidinthecableduct.Theoffsetshallbesizedsuch

··

13thatthemetalsheathswillnotgetfatiguedduringtheservice

lifeccleofthecables.Thelenthofaworkinshaftcanbe

ygg

calculatedaccordintoAendixB.

gpp

3Thenetwidthofaworkingshaftshallbedesigned

basedonthecableointhavinthelarestdiameterthatislaid

jgg

，

inthisworkingshaftthequantityofjointsandthespace

necessarforlacinconstructiontools.Thenetheihtofa

ypgg

workinshaftshallbedesinedbasedontheuantitofoints

ggqyj

andthenetdistancebetweenjointsbeingnolessthan100mm.

Thenetheihtofanenclosedworkinshaftshouldnotbeless

gg

than1.9m.

4Eachenclosedworkinshaftshallberovidedwith

gp

twosafetholeseachhavinadiameterofnolessthan700mm

yg

onthecelling.

5Onthefloorofeachworkinshaftthereshallberovided

gp

withcollectinitsandrin-ullitsandthedrainaesloe

gpgppgp

towardsthecollectingpitsshallnotbelessthan0.5%.

，

6Insideeachworkinshaftironartsnecessarforthe

gpy

installationofsupportingcolumnsshallbeembeddedonboth

，

sides.Inadditionliftinrinsforcableliftinandullin

gggpg

，

rinsforcablelainshallbeembeddedatceilinfloorand

gygg

jointswithcableducts.

7Allthemetalmembersinstalledinaworkinshaft

g

shallbeconnectedwithgroundingdevicesviagalvanizedflat

steel.Eachworkinshaftshallberovidedwithroundin

gpgg

deviceswitharoundinresistanceofnomorethan10Ω.

gg

4.4.3Thejointsandsingle-corecablesinworkingshafts

mustbefixedwithcleatsmadeofnon-maneticmaterialsor

g

··

14cleatswithmagneticisolationtreatment.

4.4.4Theoeninsofcableductsonbothsidesofworkin

pgg

shaftsshallbeplugged.

，

4.4.5Incableductswithasloereaterthan10%the

pg

workingshaftatthehigherelevationendshallbeprovided

withmemberstoreventcablesfromsliindowndueto

pppg

thermalexpansionandcontraction.

4.5CableTunnelLain

yg

4.5.1Theminimumdistancebetweencabletunnelsandadacent

j

（）

buildinsnonbuildinstructuresorielinesshallcomlwith

ggpppy

，

applicablenationalspecificationscurrentlyinforceandshouldnot

besmallerthanthevaluessecifiedinTable4.5.1.Ifsuch

p

，

requirementscannotbesatisfiednecessarymeasuresshallbetaken

durindesinandconstruction.

gg

Table4.5.1Minimumdistancebetweencabletunnelsand

（）（）

adacentbuildinsnonbuildinstructuresorielinesm

jggpp

Excavated

ConstructionschemeNon-excavatedtunnel

tunnel

ParalleldistancebetweencabletunnelNolessthantheoutside

≥1.0

（）

andbuildingsnonbuildingstructuresdiameterofthetunnel

ParalleldistancebetweencabletunnelNolessthantheoutside

≥1.0

andundergroundpipelinediameterofthetunnel

Distancebetweencabletunneland

Nolessthantheoutside

undergroundpipelinethatthecable≥0.5

diameterofthetunnel

tunnelcrosses

4.5.2Thecross-sectionalareaofcabletunnelshallbe

determinedbasedonallthecablesandancillariescontained.

··

15，

Thelayoutofcablesshallnotinterferewithsafeoperation

shallaccommodatethesacesreuiredforcablelainand

pqyg

，

routinemaintenanceandatrolinsectionandshallcoml

pppy

：

withthefollowingrequirements

1Thenetheihtofaccessesinsidecabletunnelsshould

g

，

notbelessthan1900mmandthenetheightofshort-distance

sacesforhumanactivitiesorlocalsectionswherethecable

p

tunnelscrossotherductsortrouhsshallnotbelessthan

g

1400mm.

2Thedistancefromcablesuortsincabletunnelsto

pp

thefloorshallcomplywiththerequirementsofArticle4.1.3.

3Thenetwidthofaccessesinsidecabletunnelsshall

comlwiththereuirementsofArticle4.1.4.

pyq

4.5.3Thedesignservicelifeandsafetygradeofcable

tunnelsshallcomlwithalicablenationalsecifications

pyppp

currentlinforce.

y

，

4.5.4Cabletunnelsshallbeofwaterproofdesignandshall

comlwithalicablenationalsecificationscurrentlin

pypppy

force.

4.5.5For66kVandabovesinle-corecablesthatarelaidin

g

，

tunnelssnakelainshallbedesinedbasedonthethermal

ygg

expansionandcontractionofcables.RefertoAppendixCfor

，

calculationofthelateraldislacementthermalexansionand

pp

contractionandaxialforceofsnakearc.

4.5.6Whencablesinsnakelainmodearefixedonto

yg

，

suortsarubberadshallbelacedandthefollowin

ppppg

：

requirementsshallbemet

，

1Whereverticalsnakelainisemloedcablesshall

ygpy

··

16befixedontothesupportswithmetalcleatsonthetopofevery

，

5-6snakearcsandatthelocationsnearbtheointswhilethe

yj

otherartshallbefixedontothesuortsusinroesor

pppgp

cleatswithsufficientstrength.

，

2Incaseofhorizontalsnakelaincablesshallbe

yg

fixedinthefireprooftrunksoronsupportswithcleatsatthe

half-itchsectionofeachsnakearc.

p

3Thebindinstrenthofroesshallbecheckedaainst

ggpg

theelectrodynamicforceoccurringwhenthemaximumshort-

circuitcurrentflowsthrouhthesinle-corecablesthatare

gg

bound.

（

4Whencablesaredirectllaidonsuortsfor

ypp

，）

examleinsnakelainintunnelswithasloereaterthan

pygpg

，

10%theyshallbefixedontothesupportswithcleatsonthe

toofeachsnakearcandatthelocationsnearbtheointsso

pyj

astoreventdislacementofcablesasaresultofthermal

pp

expansionandcontraction.

4.5.7Cablesshallbelaidfrombottomtotointunnelsin

p

thesequencefromhighestvoltageclasstolowestvoltage

，

classandfromstroncurrenttoweakcurrentcontroland

g

sinalcablesandcommunicationcables.Cablesofdifferent

g

voltageclassesshouldnotbelaidonthesamelayer.

4.5.8Cablesshallberiidlfixedwithcleatsonbothsides

gy

，

ofintermediatejointsandthenumberofcleatsrequiredshall

bedeterminedthrouhcalculation.

g

4.5.9Thebendinradiusofcabletunnelsshallcomlwith

gpy

therequirementsofArticle4.1.1.

4.5.10Ifthelonitudinalsloeofcabletunnelsislarer

gpg

··

17，

than10°anti-slippingterraceorstepsshallbeprovidedfor

ersonnelaccesses.

p

4.5.11Cabletunnelsandworkinshaftsshallberovidedwith

gp

：

safetyholesinaccordancewiththefollowingrequirements

1Nolessthantwoholesshallberovidedalonthe

pg

longitudinaldirectionofthetunnel.Inpublicareasincities

，

andtownsthesacinbetweensafetholesinexcavated

pgy

，

tunnelsshouldbeabout200mandthatinnon-excavated

tunnelsshouldbedeterminedcomprehensivelyconsidering

，，

suchfactorsastheconstructionconditionscablelain

yg

ventilationandfireprotection.Ifnosafetydoorisprovidedat

，

thestartandendofthetunnelsafetholesshouldbe

y

rovidedatthedistanceofnomorethan5m.

p

2Safetyholesinpublicareasshallbeprovidedwith

devicestoreventtheftandinvasion.

p

3Thereshallbeatleastonesafetholethatsuitshandlin

yg

ofinstallationmachineriesandequipment.Thediametersofsafety

holesforersonnelaccessshallnotbelessthan700mm.

p

，

4Safetyholesshallbeequippedwithladdersandthe

，

facilitiesleadintosafetdoorssuchaswalkwasor

gyy

，

staircaseshallberovidedaswell.

p

5Thesafetyholesexposedabovethegroundsurface

shouldbeawafromublictransortfacilities.

ypp

4.5.12Theclearancedimensionsofentranceandexitshall

besufficientforaccessinofoerationersonnelandforcable

gpp

lain.Theentranceandexitshouldbearranedbasedon

ygg

，

tunnelworkingshaftsandthebuildingexposedabovethe

roundsurfaceshallbedesinedinharmonwithlocal

ggy

··

18landscape.

4.5.13Cabletunnelworkinshaftsshallhavethesacefor

gp

ersonnelactivitiesandshouldcomlwiththefollowin

ppyg

：

requirements

，

1Ifworkinshaftsarenohiherthan5mladderscan

gg

beprovided.

，

2Ifworkinshaftsarehiherthan5mstaircases

gg

shouldberovidedandintermediatelatformsshouldbe

pp

providedatanintervalof4m.

3Ifworkinshaftsarehiherthan20mandthenumber

gg

，

ofcablesislargeorthecablesareofhigherimportance

simleelevatorsmaberovided.

pyp

，

4.5.14Theinterfacesofcabletunnelswithowerlants

pp

，，，

substationsdirectlyburiedcablescableductscabletrough