GB 50689-2011 GB50689-2011通信局（站）防雷与接地工程设计规范:英文

专用

人人文库

NATIONALSTANDARD

OFTHEPEOPLESREPUBLICOFCHINA

CodeforDesignofLightningProtectionandEarthing

EngineeringforTelecommunicationBureaus（Stations）

GB50689-2011

ChiefDevelopmentDepartment：MinistryofIndustryandInformationTechnology

ofthePeoplesRepublicofChina

ApprovalDepartment:MinistryofHousingandUrbanRuralDevelopment

-

ofthePeoplesRepublicofChina

ImplementationDate：May1，2012专用

人人文库

ChinaPlanningPress

Beijing2019

ChineseeditionfirstpublishedinthePeoplesRepublicofChinain2011

EnglisheditionfirstpublishedinthePeoplesRepublicofChinain2019

byChinaPlanningPress

rd

，，专用

3FloorCTowerGuohongBuilding

No.A11，Muxidi-Beili，XichengDistrict

Beijing，100038

PrintedinChinabyFactoryattachedtoBeijingInstituteofGraphicCommunication

©2011byMinistryofHousingandUrban-RuralDevelopmentof

thePeoplesRepublicofChina

Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformor

byanymeans人人文库，graphic，electronic，ormechanical，includingphotocopying，recording，

oranyinformationstorageandretrievalsystems，withoutwrittenpermissionofthepublisher.

Thisbookissoldsubjecttotheconditionthatitshallnot，bywayoftradeorotherwise，belent，

resold，hiredoutorotherwisecirculatedwithoutthepublisherspriorconsentinanyformof

blindingorcoverotherthanthatinwhichthisispublishedandwithoutasimilarcondition

includingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-5182-1097-8

AnnouncementoftheMinistryofHousingandUrban-Rural

DevelopmentofthePeoplesRepublicofChina

No.981

AnnouncementonPublishingtheNationalStandardof

CodeforDesignofLightningProtectionandEarthing

EngineeringforTelecommunicationBureaus（Stations）

CodeforDesignofLightningProtectionandEarthingEngineeringforTelecommunication

Bureaus（Stations）hasbeenapprovedasanationalstandardwithaserialnumberofGB50689-2011

andshallbeimplementedfromMay1，2012.Articles1.0.6、3.1.1、3.1.2、3.6.8、3.9.1、3.10.3、3.11.2、

3.13.6、3.14.1、4.8.1、5.3.1、5.3.4、6.4.3、6.6.4、7.4.6、9.2.9aremandatoryandmustbeenforcedstrictly.

AuthorizedbytheStandardRatingResearchInstituteoftheMinistryofHousingandUrbanRural

专用-

DevelopmentofthePeoplesRepublicofChina，thisstandardispublishedbyChinaPlanningPress.

MinistryofHousingandUrbanRuralDevelopmentofthePeoplesRepublicofChina

-

April2，2011

人人文库

Foreword

ThiscodeisformulatedbyChinaInformationTechnologyDesigningandConsultingInstitute

Co.，Ltd.accordingtotherequirementsofDocumentJianBiao〔2008〕No.105issuedbyMinistryof

HousingandUrbanRuralDevelopment"NoticeofPrintingandDistributingtheDevelopmentand

--

RevisionPlan（Secondpitch）ofNationalEngineeringConstructionStandardsin2008".

Duringtheformationofthiscode，theformationteamhasstudiedlotsofthecurrentnationallaws，

regulationsandstandards，maderelevantinvestigations，summarizedyearsofexperienceonthedesign

oflightningprotectionandearthingengineeringforTelecommunicationBureaus（Stations），repeatedly

discussedandmodifiedprovisionsofthiscodeandfinalizedthecodeafterexaminationbasedonsolicit

opinionsfromallsides.

Thiscodecomprises9chaptersand7appendixeswiththemaincontentsasfollows：general

provisions，terms，basicrequirements，thelightningprotectionandearthingofcomprehensive

telecommunicationbuilding，thelightningprotectionandearthingofcabletelecommunicationbureaus

（stations），thelightningprotectionandearthingofmobiletelecommunicationbasestation，the

lightningprotectionandearthingofsmalltelecommunicationstation，thelightningprotectionand

earthingofmicrowaveandsatelliteearstationsandthedesignoflightning专用overvoltageprotectionfor

-

telecommunicationbureaus（stations）andsoon.

Theprovision（s）printedinboldtypeis（are）compulsoryone（ones）andmustbeenforcedstrictly.

MinistryofHousingandUrbanRuralDevelopmentisinchargeoftheadministrationofthiscode

-

andtheexplanationofthecompulsoryprovisions.ChinaInformationTechnologyDesigningand

ConsultingInstituteCo.，Ltd.isresponsiblefortheexplanationofspecifictechnicalcontents.All

relevantorganizationsarekindlyrequestedtosumupandaccumulateyourexperiencesinactual

practicesduringtheprocessofimplementingthiscode.RelevantopinionscanbepostedtoChina

InformationTechnologyDesigningandConsultingInstituteCo.，Ltd.（Address：ZhuYuCommercial

Center，No.5ShouTiNanRD，HaiDianDistrict，Beijing，Postcode：100048）forreferenceofrevision

infuture.

:

ChiefDevelopmentOrganization

ChinaInformationTechnologyDesigningandConsultingInstituteCo.，Ltd

:

ChiefDraftingStaff

人人文库LiuJikeZhuQingfengChenQiangShiYuhaiWangZhigangQiZheng

NiuNianzeng

:

ChiefExaminationStaff

YangShizhongLinYongshuangGaoJianXuWeijieLiZhi

ZhangDongliangGuoYapingDaiChuanyouGuoWuSunYanling

QiuChuanruiLouJieliangXiaoBoLuZhiJun

Contents

1GeneralProvisions……………（1）

2Terms…………………………（2）

3BasicRequirements……………（6）

3.1GeneralRequirements…………（6）

3.2CompositionofEarthingSystem…………………（6）

3.3EarthElectrode…………………（7）

3.4EarthingConnection……………（8）

3.5MainEarthingConductor………………………（8）

3.6EarthingConductor……………（8）

3.7TheTypesofEquipotentialBonding………………（9）

3.8TheAccessingWaysofVariousCables……………（10）

3.9TheLayoutRequirementsofEarthingConductor……………………（10）

3.10TheProtectionoftheComputerNetworkInterfaceandControlTerminalInterface……（10）

3.11TheEarthingofCentralizedMonitoringSystemandtheInterfaceProtection专用…………（11）

3.12TheLayoutofCablesintheBureau………………（11）

3.13PowerDistributionSystem………………………（11）

3.14TheEarthingofAuxiliaryEquipmentintheEquipmentRoom………（12）

3.15TheLightningProtectionandEarthingofOpticalFiberCable………（12）

4TheLightningProtectionandEarthingofComprehensiveTelecommunicationBuilding……（15）

4.1GeneralRequirements…………（15）

4.2TheTypesofEarthingandBonding………………（16）

4.3TheTypesofInternalEquipotentialBonding………（19）

4.4EarthGrid……………………（19）

4.5TheEarthingoftheCablesEnteringintoBureau……………………（20）

4.6TheEarthingofTelecommunicationEquipment……………………（20）

4.7TheEarthingofPowerSupplySystem……………（23）

4.8TheEarthingofOtherFacilities…………………（23）

4.9TheLightning人人文库ProtectionDesignofBuilding………（24）

5TheLightningProtectionandEarthingofCableTelecommunicationBureaus（Stations）…（25）

5.1ExchangeBureauandDataBureau………………（25）

5.2AccessNetworkStationandModuleBureau………（26）

5.3BroadbandAccessSites…………（27）

5.4FiberCableRepeaterStation……………………（28）

5.5TheEarthingofDCPowerDistributionSystemforTelecommunicationEquipment……（28）

6TheLightningProtectionandEarthingofMobileTelecommunicationBaseStation…………（29）

6.1GeneralRequirements…………（29）

6.2EarthGrid……………………（29）

·1·

6.3DirectStrokeProtection…………（31）

6.4TheEarthingofAntennaandFeedingCable………（31）

6.5TheLightningProtectionandEarthingofDCRemoteFeedingSystem…………………（32）

6.6TheLightningProtectionofEarthingofGPSAntennasandFeedingCables……………（33）

6.7InternalEquipotentialBonding……………………（33）

6.8TheHandlingofEarthingConnectionandIndoorEarthing……………（34）

6.9TheEarthingofOtherAccessingCables……………（35）

6.10TheEarthingofDCPowerDistributionSystemforTelecommunicationEquipment……（35）

7TheLightningProtectionandEarthingofSmallTelecommunicationStation………………（36）

7.1GeneralRequirements…………（36）

7.2EarthGrid……………………（36）

7.3DirectLightningProtection………………………（37）

7.4Others…………………………（38）

8TheLightningProtectionandEarthingofMicrowaveandSatelliteStations…（39）

8.1TheLightningProtectionandEarthingofMicrowaveStations………（39）

8.2TheLightningProtectionandEarthingofSatelliteStations…………（41）

9TheDesignofLightningOverVoltageProtectionforTelecommunication

-

Bureaus（Stations）……………（42）

9.1GeneralRequirements…………专用（42）

9.2TheApplicationRequirementsofSPD……………（42）

9.3ThePrinciplesofLightningOverVoltageProtectionforthePowerSystemin

-

TelecommunicationBureaus（Stations）……………（43）

9.4TheInstallationRequirementsofPowerSPD………（49）

9.5ThePrinciplesofLightningOverVoltageProtectionDesignforComputerNetworksandSignalCables……（50）

-

AppendixATheStatisticsTablesoftheAverageNumberofThunderstormDaysin

OneYearonMajorCities…………（52）

AppendixBTheNationwideZonedMapoftheAverageNumberofThunderstormDays

inOneYear…………（54）

AppendixCTheRequirementsofSPDProtectionMode………（55）

AppendixDMesh，StarandStarMeshMixedEarthingSystem………………（56）

-

AppendixETheTestofEarthingResistance……………………（57）

AppendixFTheMeasurementofEarthResistivity……………（59）

AppendixGLightning人人文库ProtectionZones…………（61）

ExplanationofWordinginThisCode……………（63）

ListofQuotedStandards…………（64）

Addition：ExplanationofProvisions………………（65）

·2·

1GeneralProvisions

Thiscodeisformulatedwithaviewtopreventingorreducingthedangeroflightningstrokeat

1.0.1

telecommunicationbureaus（stations），ensuringthesafetyofthepersonnelandalsoensuringthe

telecommunicationequipmentundersafetyandnormalworkconditions.

Thiscodeisapplicabletothedesignoflightningprotectionandearthingengineeringfor

1.0.2

construction，reconstructionandextensionoftelecommunicationbureaus（stations）.

Thelightningprotectionandearthingengineeringoftelecommunicationbureaus（stations）shall

1.0.3

beconstructedbasedoncommonearthing，voltagesharingequipotentialandpartitionedprotection，

-

andtheinstallationpositionofSPD（SurgeProtectiveDevice）shallbeplannedreasonablyaccordingto

thetheoryofelectromagneticcompatibilityandtheprincipleoflightningprotectionzones.

Theriskassessmentonlightningstrokeforthedesignoflightningprotectionandearthing

1.0.4

engineeringfortelecommunicationbureaus（stations）shallbebasedonfieldinvestigationdata，

geographicalenvironment，annualthunderstormdaysandtypesofthetelecommunicationbureaus

（stations）.

SPDsselectedforlightningovervoltageprotectionprojects专用shallcomplywithtechnical

1.0.5-

requirementsontelecommunicationlightningprotectionproductsoftheMinistryofIndustryand

InformationTechnology.

1.0.6OnlythosequalifiedSPDstestedbyathirdpartytestingdepartmentaccreditedbythestate

mustbeselectedforlightningover-voltageprotectionprojectsoftelecommunicationbureaus

（）

stations.

Theannualthunderstormdaysshallbedeterminedaccordingtodataprovidedbythelocal

1.0.7

meteorologicaldepartmentsoftelecommunicationbureaus（stations）ortheprovisionsofAnnexAand

Binthiscode.

Forthedesignoflightningprotectionandearthingengineeringoftelecommunicationbureaus

1.0.8

（stations），notonlytherequirementsstipulatedinthiscodebutalsothoseinthecurrentrelevant

standardsofthenationshallbecompliedwith.

人人文库

·1·

2Terms

Lightningprotectionzones（LPZ）

2.0.1

Azoneeasilytobeaffectedbylightningstrokeisclassifiedtobetheprotectedzonesinaccordance

withthedifferencesoftheinsideandtheoutsideofbuildings，environmentsoftelecommunication

roomsandprotectedequipmentoftelecommunicationbureaus（stations）.Suchprotectedzonesare

calledthelightningprotectionzones.

Thunderstormday

2.0.2

Athunderstormdaymeansonedaywhenmorethanonethundermaybeheard.

Lowkerauniczones

2.0.3

Lowkerauniczonesarethoseareaswheretheaveragenumberofthunderstormdaysinoneyearis

nomorethan25.

Middlekerauniczones

2.0.4

Middlekerauniczonesarethoseareaswheretheaveragenumberofthunderstormdaysinoneyear

iswithinarangeof26-40.

Highkerauniczones专用

2.0.5

Highkerauniczonesarethoseareaswheretheaveragenumberofthunderstormdaysinoneyearis

withinarangeof41-90.

Strongkerauniczones

2.0.6

Strongkerauniczonesarethoseareaswheretheaveragenumberofthunderstormdaysinoneyear

ismorethan90.

Kerauniczones

2.0.7

Thekerauniczonesareclassifiedintolowkerauniczones，middlekerauniczones，highkeraunic

zonesandstrongkerauniczonesaccordingtoaveragenumbersofannualthunderstormdays.

Evaluationoflightningstrikerisk

2.0.8

Itisamethodtohavecomprehensiveevaluationonextentofdamageofthebureaus（stations）due

tolightningstroketotheearthandthendeterminelevelsandclassesofprotection，inaccordancewith

variousfactorsoflightningstroke.

Directlightningflash

2.0.9

Itisaflashdirectly人人文库attackingbuildingsorlightningprotectionsystems.

Directstrokeprotection

2.0.10

Itisameasuretoprotectbuildings，structures，electricnetworksorelectricalinstallationsfrom

beingattackedbydirectlightningflash.

Airterminalsystem

2.0.11-

Itincludeslightningrods，lightningstrips（conductors）andlightningprotectionnetsthatreceive

lightningstrokedirectly.

Rollingspheremethod

2.0.12

Itisasimplifiedanalysismethodbyapplyingtheelectricgeometrictheorytolightningprotection

analysisofbuildings.

·2·

Downconductorsystem

2.0.13-

Itisametalconductorconnectedtotheairterminalsystemandtheearthterminationsystem.

--

Lightningelectromagneticpulse（LEMP）

2.0.14

Itisanelectromagneticradiationhavingrelationshipwithlightningdischarge.Theelectricfieldand

themagneticfieldgeneratedtherebywillbecoupledtotheelectricorelectronicsystem，thus

destructivesurgecurrentorsurgevoltagewillbeproduced.

Externallightningprotectionsystem

2.0.15

Comprisedofanairterminalsystem，adownconductorsystemandanearthterminationsystem，

---

itismainlyusedasaprotectiondevicetopreventdirectlightningflash.

Soilresistivity

2.0.16

Itisaparameterrepresentingtheconductivityofsoilofwhichthevalueisequaltotheresistance

measuredattwooppositefacesofunitcubeofsoil.TheunitthereofisΩ·m.

Powerfrequencygroundresistance

2.0.17

Itistheresistancebetweentheearthelectrodeandtheremoteearth，whenthepowerfrequency

currentpassesanearthterminationsystem.Itsvalueisequaltothespecificvaluebetweenthevoltageof

-

theearthterminationsystemtotheremoteearthandthecurrentflowingtotheearthviatheearth

-

electrode.

Commonearthing

2.0.18

Itisanearthingmethodwheredifferentearthingmethods专用forvarioustelecommunication

equipmentsattelecommunicationbureaus（stations），includingworkingearthingoftelecommunication

equipment，protectiveearthing，shieldearthing，staticelectricityprotectionearthing，logicgroundof

informationequipment，andetc.arecombinedwiththeprotectiveearthingofmetalcomponentsof

buildingsandlightningprotectionsystemsandSPD，whichshares，togetherwiththelightning

protectionandearthingsystemofthebuildings，thebasicearthelectrodesandexternalearthingsystems.

Earthelectrode

2.0.19

Itisapieceoragroupofconductor（s）closelycontactingwiththesoil（theearth）toprovidethe

electricalconnectionwiththesoil（theearth），forthepurposeofconnectingtotheearth.

Earthingconnection

2.0.20

Earthingconnectionmeanstheconnectinglinebetweentheearthelectrodeandthemainearthing

bar.

Earthingsystem

2.0.21

Itisacomplexsystemcoveringallelectricconnectionsanddevicesforearthingofsystems，

appliancesandequipment人人文库，whichincludeearthelectrodesintheearth，earthingconductors，andcable

shieldinglayersconnectedtoearthelectrodes，andequipmentshellsconnectedtoearthelectrodesor

exposedmetalcomponents，rebarsorframesofbuildingsandsoon.

Earthgrid

2.0.22

Itisagroupofearthelectrodescomprisedofbareconductorswhichareinterconnectedintheearth，

forthepurposeofprovidingcommonearthforelectricalequipmentsormetalstructures.

Earthterminationsystem

2.0.23-

Itisanaggregationofearthingconductorsandearthelectrodes.

Equipotentialbonding

2.0.24

Connecttheseparateddevicesandvariousconductiveobjectsusingequipotentialbonding

·3·

conductorsorSPDs，soastoreducethepotentialdifferenceamongthemcausedbylightningcurrent.

Equipotentialbondingnetwork

2.0.25

Itisanetworkcomprisedofequipotentialbondingconductorsbywhichvariousexposed

conductivepartsofonesystemareconnected.

Earthingreferencepoint（ERP）

2.0.26

Itistheonlyoneconnectionpointbetweenthecommonearthingsystemandtheequipotential

bondingnetworkofsystem.

Mainearthingconductor

2.0.27

Itmeansthestripcopperbarorthesteelflatusedastheearthingconductor，whichisusuallyused

asthetrunklineoftheearthingsysteminsidethetelecommunicationbureaus（stations），andby

methodsoflaying，itcanbeclassifiedintothehorizontalmainearthingconductor，theverticalmain

earthingconductor，theringmainearthingconductororthebartypemainearthingconductor.

-

Earthingterminal

2.0.28

Itistheconnectionterminalofearthingconductorortheearthingbar.

Earthingbar

2.0.29

Itisconnectedwiththeearthingbus，andusedastherectangularcopperbarforconnection

terminalofvariousearthingconductors.

MainEarthingTerminal（MET）

2.0.30

Itistheearthingbartoconnectvariousearthingconductorswiththe专用earthterminationsystem，and

-

itisalsothefirststageearthingbarofthesystem.

Floorearthingbar（FEB）

2.0.31

Earthingbarsmountedateachfloorinbuildingsareusedforthepurposeofequipotentialbonding

bylocalearthingbars.

Localearthingbar（LEB）

2.0.32

Itistheearthingbarbeingusedinsidetheequipmentroomoftelecommunicationsystemforthe

purposeoflocalequipotentialbonding.

Cableentranceearthingbar（CEEB）

2.0.33

Itisanearthingbartoconnectoutdoorcablesofcableentrancefacilitywithmainearthing

terminalsorringearthelectrodes.

Cableentrancefacility（CEF）

2.0.34

Itisafacilitytoconnectthebuiltinearthingofcablewiththemetalskinforthepurposeof

-

earthing，anditshallbeasclosetotheentranceofoutdoorcableaspossibleaccordingtothepractical

situation.人人文库

CommonDCreturn（DCC）

2.0.35-

ItisaDCpowersystemwhichallowstheDCreturnconductortohavemultipointconnectionwith

surroundingbondingnetworks.

IsolatedDCreturn（DCI）

2.0.36-

ItisaDCpowersystemwhichallowstheDCreturnconductortohavesinglepointconnectionto

-

BN.

Commonbondingnetwork（CBN）

2.0.37

Itisthemainmethodforconnectionandearthingattelecommunicationbureaus（stations），a

groupofmetalpartswhichareinterconnectedwithspecialintentionorbyaccidentandusedformain

·4·

bondingnetworkofbuildings.

Verticalriser（VR）

2.0.38

Itisagroupofverticalconductorsprovidingalowresistanceengineeringpathbetweenthe

-

telecommunicationequipmentandmainearthingterminals，whichrunthroughverticallytheearthing

trunklinesateachflooroftelecommunicationbureaus（stations）.

Lightningovervoltage

2.0.39-

Itisthetransientovervoltageoccurringatsystemports，whichiscausedbylightningdischarge.

Surgeprotectivedevices（SPD）

2.0.40

SPDsaredevicesusedtoprotectvarioustelecommunicationsystemsattelecommunication

bureaus（stations）incaseoflightningovervoltageoroperationovervoltage.

--

VoltagelimitingtypeSPD

2.0.41

Ingeneral，thevoltagelimitingtypeSPDiscomprisedofmetaloxidevaristorsorsemiconductor

protectiondevices，whichmustbeusedintelecommunicationbureaus（stations）.

Maximumcontinuousoperatingvoltage

2.0.42

Itistheallowablemaximumalternatingvoltage（rms）ordirectvoltagepermanentlyappliedto

SPD.Thevaluethereofisequaltotheratedvoltage.

Residualvoltage

2.0.43

ItisthevoltagepeakbetweenterminalswhenthedischargecurrentflowsthroughSPD.

ResidualvoltageofSPD专用

2.0.44

ItisthemaximumvoltagepeakmeasuredbetweenSPDterminals，whenthesurgevoltagewith

specificwaveformandamplitudeisapplied.

Nominalstartupvoltage

2.0.45-

Itisthestartingvoltageofmetaloxidevaristor，whenaconstant1mAdirectcurrentisapplied.

Nominaldischargecurrent（In）

2.0.46

ItindicatestheindexofSPDdischargecapability，correspondingtothesurgecurrentof8/20μs

simulatedlightningwave.

Maximumdischargecurrent（Imax）

2.0.47

SPDwillnotbesubstantiallydamaged，andeachline（singlemodule）canpassthroughthe

maximumcurrentpeakwithspecificnumberoftimesandspecificwaveformsimulatedlightningwave.

Themaximumdischargecurrentis2.5timesofnominaldischargecurrent.

TwoportSPD

2.0.48-

ItisakindofSPDwithindependentI/Oports，betweenwhichaspecialseriesimpedanceis

inserted.人人文库

OneportSPD

2.0.49-

SPDisinparallelwithprotectedcircuit.Foroneportsetting，theinputportandtheoutputportcan

-

bedivided.AndnospecialseriesimpedanceisinsertedbetweenI/Oports.

Globalpositioningsystem（GPS）

2.0.50

Itisatechnologybyintegrationofsatellitesandcommunicationdevelopment，tomeasuretimeand

distancebynavigationalsatellites.

·5·

3BasicRequirements

3.1GeneralRequirements

3.1.1Commonearthingmustbeadoptedfortheearthingsystemoftelecommunicationbureaus

（）

stations.

（）

3.1.2Large-sizeormiddle-sizetelecommunicationbureausstationsmustadoptTN-SorTN-C-

Spowersystem.

Smallsizetelecommunicationbureaus（stations），mobiletelecommunicationbasestationsand

3.1.3-

smallsizestationsmayadoptTTpowersystem.

-

Thesafetyofpowersupplysystemsinsidecivilbuildingsshallbeensuredforvariouswireless

3.1.4

stationsmountedonsuchbuildings.

Thedesignoflightningovervoltageprotectionshallmeettherequirementsstipulatedinchapter

3.1.5-

9ofthiscode，andtheinstallationofSPDsshallmeettherequirementsofannexCofthiscode.

3.2CompositionofEarthingSystem

Theearthingsystemoftelecommunicationbureaus（stations）专用maybedesignedaccordingto

3.2.1

Fig.3.2.1.

人人文库Fig.3.2.1Earthingsystemoftelecommunicationbureaus（stations）

Mainearthingconductorsandearthingconductorsshallbeconnectedinalayerbylayer

3.2.2--

radiationmode，andshouldbeconnectedinalayerbylayerdendriticmodeorameshconnectionmode.

--

Followingrequirementsshallbemet：

Theverticalmainearthingconductorshallrunthrougheachfloorofthebuildingsof

1

telecommunicationbureaus（stations）.Oneendthereofshallbeconnectedtotheearthingconnection，

andtheotherendtotherebarandthehorizontalbranchedmainearthingconductorateachfloorof

buildings.Andaradiationstructureshallbeformed.Theverticalmainearthingconductorshouldbe

connectedwiththeringmainearthingconductoratthefirstfloorofbuildings（structures），andshallbe

·6·

verticallyledtothehorizontalbranchedmainearthingconductorofeachequipmentroom.

Thehorizontalmainearthingconductorsshallbelayered.Theearthingconductorsofrespective

2

telecommunicationequipmentsshallbeledinfromanadjacenthorizontalmainearthingconductoratthe

samefloor.

Thecommonearthgridsoftelecommunicationbureaus（stations）shallmaintainmutual

3.2.3

electricalconnectionbyutilizingrebarsinsidefoundationconcreteofbuildings，ringearthelectrodes

laidatthesurroundingofbuildings，andcableshieldsandvariouspipelinesconnectedthereto.

3.3EarthElectrode

Thedistancefromthetopofearthelectrodetothegroundshouldnotbelessthan0.7m.The

3.3.1

earthelectrodesatcoldregionsshallbeburiedunderthefrozensoillayerTheburialdepthofearth

electrodesatstonemountainswheresoilsarethinneroratbrokenstonesandrockyregionsshallbe

determinedaccordingtothespecificconditions.

Hotdipgalvanizedsteel，coppermaterialsandcoppercladsteelandthelikewithalengthnot

3.3.2-

lessthan2.5mshallbeadoptedformakingverticalearthelectrodes，whichmayalsobedetermined

accordingtothesoilpropertyandgeographicalconditionswhereearthgridsareburied.Thespacingof

verticalearthelectrodesshouldnotbelessthan5mAndthedetailedquantitymaybedeterminedbythe

sizeofearthgridsandgeographicalconditions.Theearthgridshallbeburiedwithverticalearth

electrodesatjunctionsofitsfourcorners.专用

Inareaswithhighsoilresistivity，inthecasewhereitisdifficulttosatisfytherequirementonthe

3.3.3

earthingresistanceofearthgrid，theradialearthelectrodemayextendoutward，orliquidlongacting

-

resistancereducingagents，earthbarsandexternalearthingandthelikemayalsobeadopted.

Theearthbarmaybeused，whenthenormalearthingmodeisnotallowedasrequestedbythe

3.3.4

cityenvironment.

Hotdipgalvanizedsteelflatsorcoppermaterialsshallbeadoptedforhorizontalearth

3.3.5

electrodes.Thehorizontalearthelectrodesshallbeconnectedwiththeverticalearthelectrodes

throughwelding.

Whenthehotdipgalvanizedsteelisadoptedfortheearthelectrode，thespecificationthereof

3.3.6

shallcomplywiththefollowingrequirements：

Thethicknessofthesteeltubeshallnotbelessthan3.5mm.

1

Thesizeofthesteelangleshallnotbelessthan50mm×50mm×5mm.

2

Thesizeofthesteelflatshallnotbelessthan40mm×4mm.

3

Thediameterofroundsteelshallnotbelessthan10mm.

4人人文库

Whencoppercladsteels，copperplatingsteelbarsandcopperplatingroundsteelsareadopted

3.3.7-

forearthelectrodes，thediametershallnotbelessthan10mm.Theplatingthicknessofthecopper

platingsteelbarandthecopperplatingroundsteelshallnotbelessthan0.254mm.

Exceptallsolderingpointsamongearthelectrodesinsideconcrete，theanticorrosiontreatment

3.3.8-

shallbeperformedtoallsolderingpointsamongotherearthelectrodes.

Theweldlengthoftheearthterminationsystemshallnotbelessthan2timesofitswidthin

3.3.9-

thecaseofusingsteelflat；itshallnotbelessthan10timesofitsdiameterinthecaseofusing

roundsteel.

·7·

3.4EarthingConnection

Earthingconnectionshallbeanticorrosiontreated.

3.4.1-

40mm×4mmor50mm×5mmhotdipgalvanizedsteelflatsormultistrandcopperwireswitha

3.4.2

sectionalareanotlessthan95mm2andalengthnotexceeding30mshouldbeadoptedforearthing

connection.

Earthingconnectionshouldnotbelaidtogetherwithheatingpipesinthesametrench.The

3.4.3

connectionsbeinglaidshallkeepfarawayfromsewagepipesandgutterway.Fortheportionsoutofthe

earth，protectivemeasurestopreventmechanicaldamageshallbetakenandinsulationandanti

-

corrosiontreatmentsshallbeperformed.

Theearthingconnectionconnectedwiththemainearthingconductorshallbeledinfromtwo

3.4.4

sidesoftheearthgridnearby.

Themultistrandcopperwireswithasectionalareanotlessthan240mm2shallbeadoptedforthe

3.4.5

earthingconnectionbetweentheearthgridofthehighrisetelecommunicationbuildingandthevertical

-

riser，whichshallbeledinfromtwodifferentdirectionsoftheearthgrid.

Theearthingconnectionshallnotbeledinfromthevicinityofthepillarofthelightningdown

3.4.6-

conductorsystem.

Thepillarrebarsbeingusedasearthingpointsatbuildingsshallberebarsthatarewhollywelded

3.4.7

andconnected.专用

3.5MainEarthingConductor

Mainearthingconductorshouldadoptthemodeofringmainearthingconductororearthingbar.

3.5.1

Theringmainearthingconductorshouldbeinstalledatthebasement，thefirstfloororthe

correspondingequipmentroomsofbuildings，oratthecablingracksformobilecommunicationorother

smallsizeequipmentrooms.Thedistancetothewall（cylinder）shouldbe50mm.Theearthingbars

-

maybeinstalledinequipmentroomsofdifferentfloors.Whenmainearthingconductorsare

interconnectedwithearthingconductorsviadifferentmetalmaterials，theelectrochemicalcorrosion

shallbeavoided.

Copperbarswiththesectionalareanotlessthan90mm2maybeadoptedformainearthing

3.5.2

conductors，andthosewiththesectionalareanotlessthan300mm2shallbeadoptedforverticalrisersat

highrisebuildings.

-

Mainearthingconductorsmaybeinstalledatcorrespondingfloorsaccordingtoarrangementof

3.5.3

telecommunication人人文库roomsandtheconditionsofbuildings.

3.6EarthingConductor

Variousearthingconductorswithintelecommunicationbureaus（stations）shallbedetermined

3.6.1

accordingtothemaximumfaultcurrentvalueandthemechanicalstrengthofmaterials，forwhich

multistrandcopperwireswiththesectionalareaof16mm2-95mm2shouldbeselected.

Multistrandcopperwireswiththesectionalareanotlessthan16mm2shallbeadoptedfor

3.6.2

earthingconductorsofinternalmainequipmentindistributionrooms，powerroomsandgenerator

rooms.

Multistrandcopperwireswiththesectionalareanotlessthan70mm2shallbeadoptedfor

3.6.3

·8·

earthingconductorsthatarelaidacrossdifferentfloorsoratthesamefloorwithlonglaying

distance.

Whenthelengthofearthingconductorsfromthemainearthingconductorateachfloortothe

3.6.4

floorearthingbarsorequipmentisrelativelyshort，themultistrandcopperwireswiththesectionalarea

notlessthan16mm2shouldbeadopted；whenthelengthislong，multistrandcopperwireswiththe

sectionalareanotlessthan35mm2shouldbeadoptedoronefloorearthingbarshouldbeadded，which

shallbefirstlyconnectedwiththeequipmentviamultistrandcopperwireswiththesectionalareanot

lessthan16mm2，andthenconnectedtothefloorearthingbarateachfloorviamultistrandcopperwires

withthesectionalareanotlessthan35mm2.

Multistrandcopperwireswiththesectionalareanotlessthan4mm2maybeadoptedforearthing

3.6.5

conductorsofsmallsizeequipmentsuchasdataservers，environmentmonitoringsystems，data

-

acquisitionunitsandsmallsizeopticaltransmissiondevices；whentheearthingconductorbecomes

-

longer，itssectionalareashallalsobeenlarged，oronelocalearthingbarmaybeadded，besides，

multistrandcopperwireswiththesectionalareanotlessthan16mm2shallbeconnectedtotheearthing

bar.Whentheearthingconductorisinstalledinanopenrack，multistrandcopperwireswiththe

sectionalareanotlessthan2.5mm2shallbeconnectedtoearthingbarsattherack，andsuchearthing

barsshallbeconnectedtothemainearthingconductorviamultistrandcopperwireswithasectionalarea

of16mm2.

Theearthingconductorsofopticaltransmissionsystemshallbein专用accordancewiththefollowing

3.6.6

requirements：

Insmallsizebureaus（stations）suchasaccessnetworksandmobiletelecommunicationbase

1-

stationsandthelike，metalintensivecoresandmetalsheathsofopticalcablesshallbeearthedreliably

inthejunctionbox，andmultistrandcopperwireswiththesectionalareanotlessthan16mm2shallbe

usedforleadingtothemainearthingterminalinthebureaus（stations）.

Metalintensivecoresandmetalsheathsofopticalcablesintelecommunicationbuildings，

2

exchangebureausanddatabureausshallbeconnectedwiththeearthingbarinjunctionboxesoratODF

（OpticalDistributionFrame），whichshallbeledtothenearbyfloorearthingbarviamultistrandcopper

wireswiththesectionalareanotlessthan16mm2；whenitisfarfromtheearthingbar，theearthing

terminalledfromthenearbymainrebarofthepillaroftransmissionequipmentroommayberegardedas

theearthpointoftheopticalcables.

Multistrandcopperwireswiththesectionalareanotlessthan10mm2shallbeadoptedfor

3

earthingconductorsofopticaltransmissionrackorsubracks.

Goodelectricalcontactshallbeensuredfortheconnectionpointsattwoendsoftheearthing

3.6.7人人文库

conductor.

3.6.8Switchesorfusesmustnotbeinstalledintheearthingconductor.

Theearthingconductorsledoutfromthemainearthingconductorsshallhaveobvioussigns.

3.6.9

3.7TheTypesofEquipotentialBonding

Themesh（M），star（S）andstartmeshmixedequipotentialbondingoftelecommunication

3.7.1-

systemmaybedesignedaccordingtoFig.3.7.1.

·9·

Fig.3.7.1Equipotentialbondingstructureoftelecommunicationsystem

：Commonearthingsystemofbuildings；：Equipotentialbondingnetwork；：equipment；

ERP：Earthingreferencepoint；：Connectionofequipotentialbondingnetworkandcommonearthingsystem

Thetypesofequipotentialbondingforthetelecommunicationsystemshallbeselectedaccording

3.7.2

toarrangementoftelecommunicationequipment，areaofequipmentroom，noiseimmunityof

telecommunicationequipmentandearthingmodeinsidetheequipment.

3.8TheAccessingWaysofVariousCables

Variouscablesshouldbeledinviaunderground.

3.8.1

Cableswithoutmetalprotectivecoveringsshouldbeledinbypassingthroughsteeltubes，and

3.8.2

twoendsofsteeltubeshallbeearthed.专用

Opticaltransmission（andelectric）cablesgettinginoroutoftelecommunicationbureaus

3.8.3

（stations）andvariouscablesshouldbegatheredatcablevaultsfromwhichcablesareledtothe

bureaus，andatthecablevaultsmetalarmouredprotectivecoveringsareeartheddirectlybyspecial

earthclamps；theopticalcableshallhaveitsmetalpartsbeingearthedattheterminal；metalsheathand

metalpartsofvariouscablesshallbeearthedattwoend，andmetalprotectivecoveringsofvarious

signalcablesshallbeearthedinthecablevaultsorconnectedwiththenearbyearthgrid.

Earthpointsformetalsheathsandmetalpartsofvariouscablesshallnotbeinstalledorledin

3.8.4

neartothepillarthatistakenasthelightningdownconductorsystem.

-

3.9TheLayoutRequirementsofEarthingConductor

，

3.9.1Whenearthingconductorsisconnectedtotheequipmentortheearthingbarthecopper

wiringterminalsshallbeequippedwithandbefirmlyfastenedorwelded.

Thesizeofwiringterminalsshallmatchwiththediameterofearthingconductors.Theplace

3.9.2

wherewiringterminals人人文库contactwithequipmentandearthingbarsshallbesmoothandfastened，without

rustingandoxidation.

Flameretardantcableswiththeirprotectivecoveringsofalternateyellowandgreensignsshall

3.9.3-

beadoptedforearthingconductors.Ortheterminationwhereearthingconductorsconnectwith

equipmentandearthingbarsmaybewrappedwithplasticinsulatingtapesofalternateyellowandgreen

signs.

3.10TheProtectionoftheComputerNetworkInterfaceandControlTerminalInterface

Vriousinterfacesofcomputernetwork，controlterninalEthernet，RS232，RS422，RS485and

3.10.1

thelikeandcablesshallbeaddedwithSPDsaccordingtorelevantprovisionsofChapter9ofthiscode.

·10·

SPDsforcomputerinterfacescontrolterminalsandnetworkdatalinesshallsatisfy

3.10.2

requirementsontransmissionrateofvariousinterfaceequipment，andlineposition，linearrangement，

linesequenceshallbecompatiblewithprotectedequipmentinterfaces.

，

3.10.3Computercontrolcentersorcontrolunitsmustbesetatthemiddlepartofbuildingsand

，

mustbefarawayfromthedistributionpathsoflightningcurrent.BesidesThepowersupply

socketontheouterwallsofbuildingsmustnotbedirectlyusedforcomputers.

3.11TheEarthingofCentralizedMonitoringSystemandtheInterfaceProtection

Atmiddlekerauniczonesorabove，themonitoringequipmentwithhighersurgeimmunityand

3.11.1

endurancecapacityshallbeadopted.

（），

3.11.2Withinthescopeoftelecommunicationbureausstationsoverheadlinesmustnotbe

usedintheoutdoorenvironment.

Theinterfaceofthekeyequipmentsrequiredforlightningprotectionshallbeequippedwith

3.11.3

correspondingSPDs.

Layingofmonitoringcablesandtrunkingsshallnotbeclosetocolumnsorbeamsofbuildings.

3.11.4

Incaseinevitable，thelayinglengthalongcolumnsorbeamsshallbeaslessaspossible.

Layingofvariouscablesshallbefarawayfromstructurespossiblysufferingfromdirect

3.11.5

lightningflash，suchastelecommunicationtowersandsoon.Suchcablesshallnotbelaidalongthe

cornersofbuildings.专用

Layingofvariousindoormonitoringcablesshouldbegatheredatthemiddlepartofbuildings.

3.11.6

Variousmonitoringcablesshouldbeshieldedcablesorrunthroughmetalconduits.

3.11.7

Twoendsofcableshieldinglayers，shieldingcasingpipesorshieldingtrenchesandthelike

3.11.8

shallbeearthed.

Thecableshieldinglayersshallmaintainwholecourseelectricconnection.Multipointearthing

3.11.9-

inthevicinityshouldbeadopted.Andshieldconnectorsandjunctionsshallbewellconnected；

meanwhiletheshieldsshallbewellearthed.

3.12TheLayoutofCablesintheBureau

Outerconductorsofcoaxialfeedercablesandtwoendsofshieldinglayersofshieldedcablesin

3.12.1

bureausshallkeepgoodelectricalcontactwithexternalsurfacesofmetalequipmentenclosureof

connecteddevicesorchassisequipment.

Iftelecommunicationbureaus（stations）areatsusceptibleareasoflightningharmorneartothe

3.12.2

interferencesource人人文库ofhighelectromagneticfield，themetalconduitsshallbeadoptedforlayingofcable

insideequipmentrooms.

Whenthelengthofvarioussignaldatalinesattelecommunicationbureaus（stations）islarger

3.12.3

than30m，suchdatalinesshallrunthroughmetalconduitsorcableswithshieldinglayershallbeused.

Twoendsofmetalconduitsorshieldinglayersofcablesshallbeweldedwiththenearbyvoltage

balancingnetsorearthgridsatthesamefloor.

3.13PowerDistributionSystem

Thesettingofhighvoltagetransmissionlinesandtransformersshallbeinaccordancewiththe

3.13.1-

followingrequirements：

·11·

Thehighvoltagepowerlinesattelecommunicationbureaus（stations）ledinfromtheterminal

1-

polesofoverheadhighvoltagepowerlinesshouldbearmourcables；whenenteringdistribution

-

transformersoftelecommunicationbureaus（stations），armourcablesatthehighvoltagesideshallbe

ledinbywhollyburied.

Whendistributiontransformersisinsidethebuildingsoftelecommunicationbureaus

2

（stations），highvoltagearmourcablesshallbeledinviaunderground，andarmourlayersattwoends

-

shallbeearthednearby.

Thedistributiontransformersofmicrowavestationsandmobiletelecommunicationbase

3

stationsbuiltatthesuburbsormountainousregionsshouldnotbemountedwithtelecommunication

equipmentinthesameequipmentrooms.

Atthejunctionsofterminalpolesofoverheadhighvoltagepowerlinesandarmourcables，

3.13.2-

threephasepowerlinesshallbeseparatelyaddedwithACgaplesszincoxidearresterswithanominal

-

voltagethereofat12.7kV（systemnominalvoltageat10kV）or7.6kV（systemnominalvoltageat

6.6kV）togroundnearby.Fortelecommunicationbureaus（stations）atmiddlekerauniczonesorabove，

andbuiltatthesuburbsormountainousregions，enhancedACgaplesszincoxidearresterswiththe

nominaldischargecurrentnotlowerthan20kAshallbeadopted.

Atthehighvoltagesideofdistributiontransformers，theACgaplesszincoxidearrestersof

3.13.3-

correspondingnominalvoltageshallbemountedattheplaceneartotransformers，andatthelow

-

voltagesideoftransformers，SPDsshallbemounted.专用

SPDearthingterminals，transformersenclosure，neutrallinesandarmorlayersofpower

3.13.4

cablesatthehighvoltagesideorthelowvoltagesidesofdistributiontransformersshallbeearthed

--

nearby.

Whenspecialtransformersareinstalledinthebureaus（stations）buildingscountyard，earth

3.13.5

electrodesoftransformersshallbeconnectedwiththoseofbuildings.Earthingconductorsshallbe

connectedwiththemainearthingconductorsinbureaus（stations）.Whenspecialtransformersare

installedinbuildings，theirearthingsystemmaysharethesameearthterminationsystemwithbureaus

-

（stations）.

（）

3.13.6Allexposedconductivepartsofdistributionequipmentequipmentbureausstations

undernormalconditionsshallbeearthed.Neutralprotectionmustnotbeadopted.

3.14TheEarthingofAuxiliaryEquipmentintheEquipmentRoom

，

3.14.1Indoorcablingracksandvariousmetalpartsmustbeearthedandelectricalconnection

mustbeadoptedbetween人人文库sectionsofthecablingracks.

Equipmentsupportingmembersandrebarsormetalpartsofbuildingssuchasracks，pipelines，

3.14.2

supports，metalsupportingmembers，channelsandthelikeshallhaveelectricalconnection.

3.15TheLightningProtectionandEarthingofOpticalFiberCable

Duringselectionofroutingofopticalcable，followingsusceptiblezonesoflightningaccidents

3.15.1

shallbekeptfaraway：

Whereasuddenchangeoccurstothesoilresistivityρatthedepthof10m.

110

Thejunctionofrockymountainsandricepaddiesorrivers，theboundaryofmineralreserves，

2

theboundaryofmountainforestsandgeologicalfaultzones.

·12·

Anadretorwindwardslopefacingtovastwatersurface.

3

Higherorisolatedmountaintop.

4

Placeswherelightningaccidentsoccurfrequently.

5

Isolatedtowersandbracingwires，toweringbuildingsandotherprotectivedevicesatthe

6

nearby.

Lightningprotectionmeasuresshallbetakenwhenopticalcablesmaybelaidatmiddle

3.15.2

kerauniczonesorabove，orinareaswithahistoryoflightningstroke.

Followingmeasuresmaybetakenforlightningprotectionofnonmetalliclinepairsanddirect

3.15.3-

burialopticalcablesthathavemetalparts：

Thesettingoflightningprotectionlinesshallbeinaccordancewiththefollowingrequirements：

1

）Inareaswhereρis＜100Ω·m，lightningprotectionlinesmaynotbeset；

110

）Inareaswhereρis100Ω·m-500Ω·m，onelightningprotectionlineshallbeset；

210

）Inareaswhereρis＞500Ω·m，twolightningprotectionlinesshallbeset；

310

）Thecontinuouslayinglengthoflightningprotectionlinesshallnotbelessthan2km.

4

Whenopticalcablesarelaidinplasticpipelinesintheopenairforalongdistance，thesettingof

2

lightningprotectionlinesshallbeinaccordancewiththefollowingrequirements：

）Inareaswhereρis＜100Ω·m，lightningprotectionlinesmaynotbeset；

110

）Inareaswhereρisρ≥100Ω·m，onelightningprotectionlineshallbeset；

21010

）Thecontinuouslayinglengthoflightningprotectionlinesshall专用notbelessthan2km.

3

Metalpartsattwosidesofthejunctionofopticalcablesshallnothaveelectricalconnection.

3

Metalpartsofopticalcablesinthebureaus（stations）shallbeearthed.

4

Inareasofseriouslightningaccidents，opticalcablesmayadoptthestructureofnonmetallic

5-

intensivecoresorofnonmetallicparts.

-

Inareassusceptibletolightningstroke，cablesinjunctionboxesofopticalcablesshouldbeled

6

infromtwoends.

Therouteofopticalcablesshallbefarawayfromisolatedbigtrees，towers，towering

3.15.4

buildings，streettrees，woodsandothersusceptiblelightningtargetsatseriouslightningstrokeareas.In

caseinevitable，protectionmeasuressuchasarcsuppressioncoilsandlightningrodsandthelikeshallbe

takenfortheopticalcable.

Fortheoverheadopticalcable，theprovisionsstipulatedinitem3-5oftheclause3.15.3of

3.15.5

thiscodeshallbecompiledwith，furthermore，thefollowinglightningprotectionmeasuresmaybe

taken：

Suspensionwiresofopticalcablesshallbeearthedatintervals.

1人人文库

Overheadearthwiresshallbesetinareaswhereespeciallyseriouslightningaccidentsmay

2

occur.

Thelightningprotectionofoverheadopticalcablesinthebureausshallbeinaccordancewith

3.15.6

thefollowingrequirements：

Overheadopticalcableshouldbefarawayfromspecialareassusceptibletodirectlightning

1

flash；suspensionwiresofopticalcablesshallbeearthedbyuseofpolelightningconductorsorbracing

wiresatanintervalof300m-500m，andinsulatorsshallbeaddedforelectricalisolationatanintervalof

about1km.

Inareaswhereespeciallyseriouslightningaccidentsmayoccur，overheadearthwiresshallbe

2

·13·

setabovetheoverheadopticalcables.

Directburialopticalcablesandincominglowvoltagepowercablesofmicrowavestationsand

3.15.7-

basestationsatthebureausorhighmountainsmaybeburiedandlaidinthesametrenchesorgrooves.

Theburialdepthshouldbedeterminedaccordingtogeologicalconditionsandtheconditionsthat

requirementsonincominglowvoltagepowercablesaresatisfied.

-

专用

人人文库

·14·

4TheLightningProtectionandEarthingofComprehensive

TelecommunicationBuilding

4.1GeneralRequirements

Comprehensivetelecommunicationbuildingsshallbebuiltontheprincipleofcommonearthing，

4.1.1

andthefoundationofbuildingsshallbeconnectedwithearthingsystemsofvariousequipmentand

devices，includingallelectricalconnectionandmetalpartsofbuildings，lowvoltagedistribution

-

earthingconductors，staticelectricityprotectiveearthingandsoon.Besides，ringearthelectrodesshall

beweldedandconnectedwithrebarsinhorizontalfoundationofbuildings.

Whenacomprehensivetelecommunicationbuildingiscomprisedofmanybuildings，earthgrids

4.1.2

ofbuildingsshallbeinterconnectedviahorizontalearthelectrodes，formingaclosedringconfiguration.

Whentheyarefarfromeachotheroritisdifficultforinterconnection，thesebuildingsmaybehandled

separatelyasindependentbureaus（stations）.

Thecomprehensivetelecommunicationbuildingshalladoptcomprehensivelightningprotection

4.1.3

systemssuchasexternallightningprotectionsystems，internalequipotentialbondingandlightning

electromagneticpulseprotectionandthelike.专用

Fortheearthingsysteminsidethecomprehensivetelecommunicationbuilding，acomplete

4.1.4

equipotentialbondingsystemshallbecomprisedofamainearthingterminal，floorearthingbar，local

earthingbarandtheearthingterminalpreinstalledinthepillar，andrespectivesubearthingsystemshall

-

beconnectedviaearthingconductors，formingdifferentearthingreferencepoints.

Forearthingsysteminsidethecomprehensivetelecommunicationbuilding，oneormorelines

4.1.5

maybeledoutfromthemainearthingconductorsatthefirstfloortothehighriseverticalRiser，and

-

thebranchedmainearthingconductorateachfloorshallbeledoutfromtheplacenearby，finally

formingtheverticalrisernetwork.

Whentransformersareinstalledinthebuildings，neutralpointsoftransformersandmain

4.1.6

earthingconductorsshouldbeconnectedviadoublelines.

Thecommonearthingsystemofcomprehensivetelecommunicationbuildingmaybedesigned

4.1.7

accordingtoFig.4.人人文库1.7.

·15·

专用

Fig.4.1.7Connectionmodeofcommonearthingsystemofcomprehensivetelecommunicationbuilding

4.2TheTypesofEarthingandBonding

Thetypesofearthingandbondingatthecomprehensivetelecommunicationbuildingmaybe

4.2.1人人文库

classifiedintothebondingsystemofexternalringmainearthingconductorandthebondingsystemof

verticalriser.

Thebondingsystemofexternalringmainearthingconductorsmaybedesignedaccordingto

4.2.2

Fig.4.2.2.Thebondingsystemofexternalringmainearthingconductorsmaybeappliedtothe

comprehensivetelecommunicationbuildingwithlowheightandlargeareaorwithrectangularshape，or

usedforseveralfloorsorsomeequipmentroomsofthehighrisecomprehensivetelecommunication

-

building，oradoptedbybureaus（stations）havinghighriskofelectromagneticpulse.Thebonding

systemofexternalringmainearthingconductorsshallbeinaccordancewiththefollowing

requirements：

·16·

Fig.4.2.2Bondingsystemofexternalringmainearthingconductor

Forfacilitiesateachfloororequipmentroomsatcorrespondingfloors，theringmain

1

earthingconductorsshallbeinstalledbyonecirclearoundtheinteriorofbuildings；theringmain

earthingconductorshallbeconnectedwiththepreinstalledearthterminalforrebarsofbuilding

pillars；theheightofringmainearthingconductorsshallbeselectedaccordingtotheconditionof

equipmentrooms.

Verticalbondingconductorsshallbeconnectedwithringmainearthingconductorsateachfloor

2专用

orequipmentroomsatcorrespondingfloors.Thequantityandspacingofverticalbondingconductors

shallbeinaccordancewiththefollowingrequirements：

）Ateachcornerofbuildings，thereshallbeatleastoneverticalbondingconductor；

1

）Whenthespacebetweenconductorsatcornersandthoseatthemiddleofbuildingsexceeds

2

30m，additionalverticalbondingconductorsshallbeinstalled，andthespacingofvertical

bondingconductorsshouldbelaiduniformly.

Theringmainearthingconductoratthefirstfloorshallbeconnectedwiththeexternalring

3

earthelectrodeonceatanintervalof5m-10m，andfollowingobjectsshallbeconnectedtothering

mainearthingconductor：

）Earthingbarsineachcableentrancefacility；

1

）Thecollectionpointsofshieldinglayersofpowercablesandvariousearthingconductors；

2

）Variouspipelinesystemsinstructures；

3

）Othermetalconductorsenteringbuildings.

4

Branchedringmainearthingconductorsmaybeaddedincorrespondingequipmentrooms，

4人人文库

whichshallbeconnectedwiththeringmainearthingconductors.

Inlargesizetelecommunicationbuildings，thescopeofringmainearthingconductorsforthe

5-

earthingsystemmaybeshrunktothebuildingareaswheretherearetelecommunicationequipment

equipmentrooms，andthescopeandthequantityofverticalbondingconductorsshouldbeset

accordingtotheactualsituation.

Onevoltagebalancingnetshallbedisposedeveryotherfloorinlargesizetelecommunication

6-

buildings.

ThebondingsystemofverticalrisershallbedesignedaccordingtoFig.4.2.3，whichshallbein

4.2.3

accordancewiththefollowingrequirements：

·17·

Fig.4.2.3Connectingsystemofverticalriser

ThemainearthingterminalshouldbedesignedneartheledinpointofACmainspower

1-

supply，andshallbeconnectedwithfollowingparts：专用

）Earthingconnectionoftheearthgrid；

1

）Bondingconductorsofthecableentrancefacility；

2

）BondingconductorsoftheshieldinglayersoftheACmainspowerandvariousearthing

3

conductors；

）Bondingconductorsofwaterpipesystemsinstructures；

4

）Bondingconductorsforothermetalpipelinesandburiedstructures；

5

）Steelstructuresofbuildings；

6

）Oneormoreverticalrisers.

7

Foroneormoreverticalrisersfrommainearthingterminalstoeachfloorofbuildings，thesteel

2

structureofbuildingsmaybeusedastheverticalriserundertheconditionofelectricalconnection.

Eachverticalrisershallservethetelecommunicationequipmentlocatedwithinaareaofa30m

3

（longside）rectanglecenteredontheverticalriser.Equipmentoutsidethisareashouldbeservedby

otherverticalriser.

Verticalrisershallbeinterconnectedatanintervaloftwoorthreefloors.

4人人文库

Oneormorefloorearthingbar（s）shallbebuiltateachfloor.Eachfloorearthingbarshallbe

5

connectedtothenearbyverticalriser，andeachfloorearthingbarshallbearrangedatthecenterof

placewheretheearthingoftelecommunicationequipmentistobeprovidedforeachsub

-

telecommunicationsystem.

Variousequipmentbondingnetwork，theearthingconductorsofdirectcurrentelectricunits

6

andothersystemsshallbeconnectedtotheearthingbarontheirfloor.

Telecommunicationequipment，verysensitivetothunderandlightning，shallbefarawayfrom

4.2.4

mainearthingbar，cableentrancefacilities，ACmainssupplyandconnectingwiresamongearthing

systems.

·18·

4.3TheTypesofInternalEquipotentialBonding

Thestarmeshmixedearthingconfigurationshallbeadoptedintelecommunicationbureaus

4.3.1-

（stations），whichshallmeettherequirementsofAppendixDofthiscode.

Themixedearthingconnectioninthemodeofringmainearthingconductormaybedesigned

4.3.2

accordingtoFig.4.3.2.

专用

Fig.4.3.2Mixedearthingconnectioninmodeofringmainearthingconductor

Afterbuildingsadoptingequipotentialbondingmeasures，eachequipotentialbondingnetwork

4.3.3

shallhavereliableconnectiondirectlytotheearthwiththecommonearthingsystem.Forthe

equipotentialbondingsystemofeachsubtelecommunicationsystem，theindividualdownconductor

-

systemconnectedtothemainearthingbarshouldnolongerbeset，andinsteadtheequipotential

bondingsystemshouldbeledtothefloorearthingbarofthesamefloorviatheearthingconductor.

4.4EarthGrid

Theearthgridofthecomprehensivetelecommunicationbuildingmaybedesignedaccordingto

4.4.1

Fig.4.4.1，andtheringearthelectrodeandthevoltagebalancingnetshallbeinterconnectedonceatan

intervalof5m-10m.

人人文库

Fig.4.4.1FormingWayofEarthGridfortheComprehensiveTelecommunicationBuilding

Forthecomprehensivetelecommunicationbuildingadoptingtheringmainearthingconductor，

4.4.2

theconnectionbetweentheearthingconductorandtheearthgridmaybedesignedaccordingto

Fig.4.4.2.

·19·

Fig.4.4.2Connectionofringrmainearthingconductorandearthgrid

Besidesatfourcornersofbuildings，theringmainearthingconductorandtheringearth

4.4.3

electrodeshallbeinterconnectedonceeveryotherpillar.

4.5TheEarthingoftheCablesEnteringintoBureau

Thecomprehensivetelecommunicationbuildingshallbeequippedwiththecableentrance

4.5.1

facility，andtheoutdoorcablesofthecableentrancefacilityshallbeconnectedwiththemainearthing

barsorringmainearthingconductorsviatheearthingbar.ItmaybedesignedaccordingtoFig.4.5.1，

andshallbeinaccordancewiththefollowingrequirements：专用

Allconnectionsshallbeclosetotheperipheryofbuildings.

1

Theentrancefacilities，especiallythepowerledinfacilitiesandcableentrancefacilities，shall

2-

clingtogethertightlyaccordingtotheactualsituation.

Thebondingconductorsofentrancefacilityshallbeshortandstraight.

3

人人文库

Fig.4.5.1Exampleofcableconnectionforthecableentrancefacilitywiththeearthingbar

4.6TheEarthingofTelecommunicationEquipment

Duringtheoverallplanningoftelecommunicationrooms，themaindistributionframeshouldbe

4.6.1

installedinthevicinityofcablevaultsatthefirstfloor.Theearthingconnectionshallbeledinfromtwo

directionsoftheearthgridnearby.

·20·

Unshieldedsignalcablesorpowercablesshallnotbelaidontheouterwall.Incaseinevitable，all

4.6.2

suchcablesshallrunthroughshieldedmetalpipes，andtwoendsofmetalpipesshallbeconnectedto

thecommonbondingnetwork.

Thetelecommunicationequipmentshouldbeplacedatanarea1mawayfromthepillarofouter

4.6.3

wall.Andtheequipmentcabinetshallnotcontacttheouterwalldirectly.

Forthetelecommunicationsystemofthecomprehensivetelecommunicationbuilding，whenits

4.6.4

subsystemsorequipmentareinterferedduetotheearthingmode，oneormorelocalearthingbar（s）

shouldbemountedinequipmentrooms.Theearthingconductorsfordifferenttelecommunication

subsystemsorequipmentshallconnectwiththecorrespondinglocalearthingbarfirstlyandthenwith

thefloorearthingbar.

Whenthetransmissionequipmentisinterferedbydifferentearthingmodes，antiinterference

4.6.5-

measuressuchastheisolationtreatmentbydisconnectingoneendoftheshieldinglayeroftheshield

transmissionlineshallbetaken.

Earthingconductorsoftelecommunicationequipmentrackswiththedemandonindividual

4.6.6

protectiveearthingshallbeledinfromthemainearthingconductororthebranchedmainearthing

conductorsinequipmentrooms.

Digitaldistributionframe（DDF），ODFsorboards，dataserversandracksshallbeearthed.

4.6.7

TheearthingofDCpowerdistributionsystemfortelecommunicationequipmentofthe

4.6.8

comprehensivetelecommunicationbuildingshallbeinaccordancewiththe专用followingrequirements：

DCCCBNsystemmaybedesignedaccordingtoFig.4.6.81.

1---

Fig.4.6.81DCCCBNsystem

---

DCCIBNsystemmaybedesignedaccordingtoFig.4.6.82andFig.4.6.83.

2--人人文库--

Fig.4.6.82SPCDCCIBNsystemonBRbusbar

---

·21·

Fig.4.6.83DCCIBNsystemwithindividualSPCB

---

DCICBNsystemmaybedesignedaccordingtoFig.4.6.84.

3---

专用

Fig.4.6.84DCICBNsystem

---

DCIIBNsystemmaybedesignedaccordingtoFig.4.6.85.

4---

Fig.4.6.85DCIIBNsystem

---

DCC/DCImixedtypesystemmaybedesignedaccordingtoFig.4.6.86.

5-人人文库--

·22·

Fig.4.6.86DCC/DCICBNmixedtypesystem

----

4.7TheEarthingofPowerSupplySystem专用

DCearthingconductorsforpowerroomsofthecomprehensivetelecommunicationbuilding，

4.7.1

withcentralizedpowersupply，shallbeledinfrommainearthingconductors.

DCearthingconductoratthehighrisecomprehensivetelecommunicationbuilding，with

4.7.2-

distributedpowersupply，shallbeledinfromsubmainearthingconductors.

-

4.8TheEarthingofOtherFacilities

4.8.1Variousmetalfacilitiesattheroofmustbeseparatelyconnectedwiththenearbyroof

lightningstripsorpreinstalledearthingterminals.

Powerlinesforroofaviationobstructionbeacon，coloredlamps，aviationobstructionbeaconsat

4.8.2

thetelecommunicationtowerofwirelesstelecommunicationsystemandotherelectricequipmentshall

adoptmetalsheathcables.Cablemetalprotectivecoveringsormetalpipes，whicharelaidhorizontally，

shallbeconnectedwiththenearbylightningstripsorearthingconductorsatanintervalof5m-10m.

Cablemetalprotectivecoverings，whicharelaidinupanddowndirection，shallbeearthednearbyat

leastonceattheupperendorthelowerend.

Metalpipelines人人文库ateachfloorinthebuildingshallbeearthedattheplacenearby.Theupperand

4.8.3

lowerendsofelevatorslidewaysinthebuildingsshallalsobeearthedattheplacenearby，besides，the

elevatorslidewaysshouldbeearthedeveryotherfloor，startingfromtheplacewherethedistancetothe

groundisover30meters.

Theelectricalconnectionshallbemadeforallsectionsofmetalverticalshaftsandmetal

4.8.4

channelsinthebuilding.Theupperandlowerendsofthemetalverticalshaftshallalsobeearthedatthe

placenearby，besides，themetalverticalshaftshouldbeearthedeveryotherfloor，startingfromthe

placewherethedistancetothegroundisover30meters.Metalchannelsshallalsokeepgoodconnection

withracksorreinforcedsteelbeams.

·23·

Signalverticalshaftsatthecomprehensivetelecommunicationbuildingshouldbedesignedatthe

4.8.5

middleofthebuilding.

4.9TheLightningProtectionDesignofBuilding

Thelightningprotectionearthingofbuildingsshallbeusedascomponentoftheearthingsystem

4.9.1

ofsuchbuildings.

Thedownconductorsystemoflightningprotectionsystemsatbuildingsshouldmakeuseofthe

4.9.2-

mainrebarsattheoutsideoftheroompillarsofthebuildings.Theoutsidemainrebarsshallnotbeless

than2pieces.Theupperandthelowerconnectionpointsofrebarsthemselvesshalladopttheoverlap

welding.Theupperportionshallbeweldedwiththerooflightningstrips，sodothelowerportionand

theearthgrid，andthemiddleportionandeachvoltagebalancingnet，sothatformingastructuresimilar

tothestyleofFaradaycageinelectricalconnection.

Ifthebuildingheightexceeds30m，theroofshouldbeinstalledwithaconcealedlightning

4.9.3

protectionnet.Theroofparapetshallbesetwithlightningstrips.Thetowerroofshallbesetwith

lightningrods.Andsuchlightningprotectionnets，lightningstripsandlightningrodsshallbe

interconnectedthroughmultipointwelding.

Ifthebuildingheightexceeds30m，thevoltagebalancingnetshallbeseteveryotherfloorfrom

4.9.4

theplaceabove30m.

Theconcealedlightningprotectionnetandeachvoltage专用balancingnet（includingthe

4.9.5

subfoundation）maybemutuallyweldedtoaringstrip，whoseperipheryisinenclosedshape，byuseof

twomainrebarsinbeamsorfloorslabatthisfloorandaccordingtoameshsizenotlargerthan10m×

10m.Themeshintersectionandtherebaritselfshallbeweldedtightly.Thevoltagebalancingnetmay

bedesignedaccordingtoFig.4.9.5，andtheintersectionshalladoptthediagonalweldingmethod.

人人文库Fig.4.9.5Formingwayofvoltagebalancingnet

·24·

5TheLightningProtectionandEarthingofCable

TelecommunicationBureaus（Stations）

5.1ExchangeBureauandDataBureau

Thesecurityunitofmaindistributionframeshallbeinaccordancewiththefollowing

5.1.1

requirements：

Formaindistributionframesofexchangebureausatlowkerauniczonesandmiddlekeraunic

1

zones，thesecurityunitconsistingofgasdischargetubesorsemiconductorprotectiondevicesand

positivetemperaturecoefficientthermistormaybeadopted.

Formaindistributionframesofexchangebureausathighkerauniczonesandstrongkeraunic

2

zones，thesecurityunitconsistingofsemiconductorprotectiondevicesandthepolymerpositive

temperaturecoefficientthermistorshallbeadopted.

Forexchangebureausatlowkerauniczonesandmiddlekerauniczones，ifthelightningstroke

3

accidentmayoccursometimestotheuserpanelofexchange，theclassificationofkerauniczonefor

selectionofthesecurityunitofmaindistributionframemayaddbyonelevel；forthemaindistribution

frameofexchangebureauathighkerauniczonesandstrongkeraunic专用zones，ifthelightningstroke

accidentmayoccurjustbyaccidenttotheuserpanelofexchange，theclassificationofkerauniczonefor

selectionofthesecurityunitofmaindistributionframemayreducebyonelevel.

Theequipotentialbondingshallbeinaccordancewiththefollowingrequirements：

5.1.2

Equipmentroomsmayadoptthemodeofstarmeshmixedequipotentialbonding；thestored

1-

programcontrolexchangeshouldadoptstarearthingmode，andothertelecommunicationequipment

shouldadoptmeshearthingmode.

Fortheexchangebureauandthedatabureauwithhighercapacityandwiththelengthof

2

equipmentroomover30m，theringmainearthingconductorshouldbesetinsidetheequipment

room.

Notonlytherelevantrequirementsstipulatedinchapter3ofthiscodeontheearthingof

5.1.3

exchangebureauanddatabureau，butalsothefollowingrequirementsshallbecompliedwith：

Duringoverallplanningofequipmentrooms，themaindistributionframeshouldbeinstalled

1

nearbythecablevaultsatthefirstfloor，whichshallbeearthedfromthenearbyearthingterminal

preinstalledinbuildings人人文库orthenearbymainearthingconductor.Earthingconnectionsshallbeledinfrom

thenearbytwodirectionsoftheearthgrid.

Theemptylinepairoflocalcablesshallbeearthedattheplacenearthedistributionframe.

2

Theearthingofcentralizedmonitoringsystemandprotectionoftheinterfaceshallmeetthe

5.1.4

requirementsofsection3.11ofthiscode.

ExchangebureauanddatabureauearthingsystemmaybedesignedaccordingtoFig.4.1.7ofthis

5.1.5

code.

TheearthgridofexchangebureauanddatabureaumaybedesignedaccordingtoFig.5.1.6.

5.1.6

·25·

Fig.5.1.6Earthgridofexchangebureauanddatabureau

5.2AccessNetworkStationandModuleBureau

TheSPDinstallationpositionintheswitchingpowersupplyshallbeinaccordancewiththe

5.2.1

followingrequirements：

Whenequipmentroomsadoptthemodeofupwardrouting，theSPDshouldlocateinsidethe

1-

switchingpowersupplyattheinteriorupperpartoftheequipmentcabinet.

-专用

Whenequipmentroomsadoptthemodeofdownwardrouting，theSPDshouldlocateinside

2-

theswitchingpowersupplyattheinteriorlowerpartoftheequipmentcabinet.

-

Theearthingofmaindistributionframeshallbeinaccordancewiththefollowingrequirements：

5.2.2

Fortheearthingconductorofmaindistributionframe，themultistrandcopperwireswiththe

1

sectionalareanotlessthan35mm2shallbeleddirectlyintothemainearthingterminalorintothenearby

outdoorringearthelectrode.Theconnectionshallbeledinseparatelyfromtwodirectionsoftheearth

gridnearby.

Whenthemaindistributionframeintheaccessnetworkstationisfarfromtherackofaccess

2

network，themaindistributionframeshallbeearthedwiththenearbyringearthgrid.

Thattheearthingbarofmaindistributionframeisdirectlyusedasthemainearthingterminal

3

shallbeavoided.

Themainearthingterminalshallbesetclosetothedistributionboxattheentranceofpower

5.2.3

supplylineledtothebureau；thefirstlevellightningprotectionboxshallbeinstalledataplacenearbyto

thedistributionbox，whichmeanwhileshallbeearthedattheplacenearby.

Theearthgrid人人文库ofaccessnetworkstationshallbethecommonearthingsystemconsistingofthe

5.2.4

foundationofequipmentroomsandtheexternalringearthelectrode.Theringearthelectrodeshallbe

weldedandconnectedwithrebarsinthebuildingfoundation.Theareaofearthgridshallbelargerthan

100m2.Inareaswithhighsoilresistivity，theradialpatternofhorizontalearthelectrodeshouldbe

providedatfourcornersoftheearthgrid.Theearthgridofaccessnetworkstationmaybedesigned

accordingtoFig.5.2.4.

·26·

Fig.5.2.4Typicalearthgridofaccessnetworkstation

Thewirelessaccessnetworkstationshallbeinaccordancewiththefollowingrequirements：

5.2.5

TheearthgridofwirelessaccessnetworkstationshouldbedesignedaccordingtoFig.5.2.5.

1

Whentheaccessnetworkstationandthemobiletelecommunicationbasestationareatthesamestation，

theearthgridofequipmentroomsshallmeettherelevantrequirementsstipulatedinchapter6ofthis

code.

专用

Fig.5.2.5Typicalearthgridofwirelessaccessnetworkstation

Fortheaccessnetworkstationbuiltinresidentialareas，whenbasementsandthefirstfloor

2

roomsinbuildings人人文库ofurbancommunitiesareusedasequipmentrooms，theearthelectrodeshallbe

formedbyfullyuseofmetalpipelines，whichmayformacircuitwithbuildingsandtheground，andthe

earthterminalspreinstalledinbuildings.Wherepossible，theearthingofaccessnetworkstationmaybe

realizedbyknockingseveralroompillarsforgettingrebarsandthenconnectingthemwiththe

preinstalledearthterminals.

5.3BroadbandAccessSites

5.3.1Equipmentofuserunitsofbroadbandaccesssitesmustbeearthed.

Fortheearthingofuserunitsofbroadbandaccesssites，rebarsinthebuildingfoundationshallbe

5.3.2

directlyusedastheearthelectrode.

·27·

Networkcablesofbroadbandaccesssitesshallhavemetalshieldinglayers.Twoendsofmetal

5.3.3

shieldinglayersofnetworkcablesshallbeearthedreliably.Thenetworkcablesamongbuildingsshallbe

farawayfromoverheadflywires.

5.3.4NetworkcablestoandfrombuildingsmustbeaddedwithnetworkdataSPDsatthe

interfaceofnetworkswitch.

Thepowersupplydistributionboxfornetworkswitches，concentratorsandopticaltransceivers

5.3.5

shallbeaddedwithtwoportSPDs.

-

5.4FiberCableRepeaterStation

Thefirstlevelprotectorsoffibercablerepeaterstationshallbeinstalledneartothepower

5.4.1

distributionbox，andshallbeearthedattheplacenearby.Theearthingsystemoffibercablerepeater

stationmaybedesignedaccordingtoFig.5.2.4.

ODFandDDFracksinstationsshallbeearthedattheplacenearby.

5.4.2

Thefibercablerepeaterstationshouldadoptthestarradialearthingmode.

5.4.3

5.5TheEarthingofDCPowerDistributionSystemforTelecommunicationEquipment

Whenaccessnetworks，modulebureausandbasestationsareatthesamestations，theearthing

5.5.1

forDCpowerdistributionsystemsoftelecommunicationequipmentmaybedesignedaccordingto

Fig.5.5.1.专用

Fig.5.5.1EarthingforDCpowerdistributionsystemoftelecommunicationequipment

ThelightningovervoltageprotectiondesignforDCpowerdistributionsystemoftelecommunic

5.5.2人人文库--

ationequipmentshallmeettherelevantrequirementsstipulatedinchapter9ofthiscode.

·28·

6TheLightningProtectionandEarthingof

MobileTelecommunicationBaseStation

6.1GeneralRequirements

Forthelightningprotectionofmobiletelecommunicationbasestation，asolutionwith

6.1.1

reasonableratiooftechnologytoeconomyshallbeselectedinaccordancewithfactorssuchasthe

lightningimpulseradius，theconditionthatthesurgecurrentisshuntednearby，shieldearthingof

cablesinstationsandthelightningovervoltageprotectionofpowercablesandsignalcablesandthelike.

-

Theearthgridofmobiletelecommunicationbasestationshallbedesignedaccordingtofactors

6.1.2

suchastheformofbasestationstructures，geographicposition，neighboringenvironment，geologyand

climateconditions，soilconstitutionandsoilresistivityandthelike.Theshapeofthesurrounding

bordersofearthgridshallbedeterminedaccordingtofactorssuchasgeographicalconditionsofbase

stationsandtheterrainandthelike.

Thelightningprotectionandearthingofmobiletelecommunicationbasestationshall，inthe

6.1.3

viewofoverall，integrateseveralisolatedsubsystemsinthebasestationsintoanintegrated

telecommunicationsystem，andmeasurethelightningprotectionandearthing专用issuecomprehensively.

Theevaluationoflightningstrikerisk，lightningovervoltageprotection，SPDmaximum

6.1.4-

dischargecurrentofmobiletelecommunicationbasestationshallbedeterminedaccordingtofactors

suchasannualnumberofthunderstormdays，altitude，environmentalfactors，buildingform，power

supplymodeandlocalvoltagestabilityandthelike，andthecoordinationandcooperationofSPDsatall

levelsshallbeensured.

6.2EarthGrid

Theearthgridofmobilebasestationsshallbecomprisedofbuildingearthgridsand

6.2.1-

telecommunicationtowerearthgrids，orofbuildinggrids，telecommunicationtowerearthgridsand

transformerearthgrids.Theearthgridofbasestationsshalltakefulluseofmainrebarsinthefoundation

ofbuilding（includingstakes）andthoseinthefoundationoftelecommunicationtowerandothermetal

facilitiesundergroundaspartsoftheearthelectrode.

Thebuildingearthgridshallhavetheexternalringearthingelectrodealongtheoutsideofaproll

6.2.2

pointsofbuilding，人人文库andthebuildingearthgridshallbejointlyformedbymorethantwomainrebarsin

horizontalandverticalbeamsatthefoundationofbuilding.Ifstakesareprovidedforthefoundationof

building，morethantwomainrebarsinthestakesshallbeweldedandconnectedwiththebuildingearth

grid.

Ifthetelecommunicationtowerisbythesideofbuilding，thetelecommunicationtowerearth

6.2.3

gridshalladoptthe40mm×4mmhotdipgalvanizedsteelflat，soastoweldandconnectmetalpartsin

fourfeetofthetowerfoundationandformthetowerearthgrid.Itsmeshsizeshallnotbelargerthan

3m×3m.Thetelecommunicationtowerearthgridshallbeweldedandconnectedoncewiththebuilding

earthgridatanintervalof3m-5m，besides，thereshallbeatleasttwoconnectionpoints.

Whenpowertransformersaresetinbuilding，theearthgridoftransformersmaysharethe

6.2.4

·29·

commonearthgridcomprisedofbuildingandtelecommunicationtowers.Whenpowertransformersare

setoutsidebuilding，andtheedgeofbuilddingearthgridislongerthan30m，independentearthgrids

maybeinstalled；whenthedistancebetweenpowertransformersandthebuildingea