GB 51120-2015 GB51120-2015通信局（站）防雷与接地工程验收规范:英文

专用

人人文库

NATIONALSTANDARD

OFTHEPEOPLESREPUBLICOFCHINA

CodeforAcceptanceofLightningProtectionandEarthing

forTelecommunicationBureaus（Stations）

GB51120-2015

ChiefDevelopmentDepartment:MinistryofIndustryandInformationTechnologyofthe

PeoplesRepublicofChina

ApprovalDepartment:MinistryofHousingandUrbanRuralDevelopmentofthePeoples

-

RepublicofChinaImplementationDate:May1专用，2016

人人文库

ChinaPlanningPress

Beijing2019

ChineseeditionfirstpublishedinthePeoplesRepublicofChinain2015

EnglisheditionfirstpublishedinthePeoplesRepublicofChinain2019

byChinaPlanningPress

rd

，，专用

3FloorCTowerGuohongBuilding

No.A11，Muxidi-Beili，XichengDistrict

Beijing，100038

PrintedinChinabyBeijingJingyintangGraphicPrintingCenter

©2015byMinistryofHousingandUrban-RuralDevelopmentof

thePeoplesRepublicofChina

Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformor

byanym人人文库eans，graphic，electronic，ormechanical，includingphotocopying，recording，

oranyinformationstorageandretrievalsystems，withoutwrittenpermissionofthepublisher.

Thisbookissoldsubjecttotheconditionthatitshallnot，bywayoftradeorotherwise，belent，

resold，hiredoutorotherwisecirculatedwithoutthepublisherspriorconsentinanyformof

blindingorcoverotherthanthatinwhichthisispublishedandwithoutasimilarcondition

includingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-5182-1099-2

AnnouncementoftheMinistryofHousingandUrban-Rural

DevelopmentofthePeoplesRepublicofChina

No.888

AnnouncementonPublishingtheNationalStandardofCodeforAcceptanceof

LightningProtectionandEarthingforTelecommunicationBureaus（Stations）

CodeforAcceptanceofLightningProtectionandEarthingforTelecommunicationBureaus

（Stations）hasbeenapprovedasanationalstandardwithaserialnumberofGB511202015andshallbe

-

implementedfromMay1，2016.Articles3.0.1、6.3.2、6.3.4and7.3.1aremandatoryandmustbe

enforcedstrictly.

AuthorizedbytheStandardRatingResearchInstituteoftheMinistryofHousingandUrbanRural

-

DevelopmentofthePeoplesRepublicofChina，thisstandardispublished专用byChinaPlanningPress.

MinistryofHousingandUrbanRuralDevelopmentofthePeoplesRepublicofChina

-

August27，2015

人人文库

Foreword

AccordingtotherequirementsoftheDocumentJIANBIAO〔2009〕No.88issuedbytheMinistry

ofHousingandUrbanRuralDevelopment（MOHURD）"NoticeonPrintingandDistributingthe

--

DevelopmentandRevisionPlanofNationalEngineeringConstructionStandardsin2009"，thiscodeis

formulatedonthebasisofYD/T51752009，"AcceptanceSpecificationofEngineeringforLightning

-

ProtectionandEarthingforTelecommunicationBureaus（Stations）"，issuedbytheMinistryofIndustry

andInformationTechnologyofthePeoplesRepublicofChina，throughinvestigationandstudy，

practicalexperiencesummarization，andwideopinionsolicitingbythedraftingteam.

Maincontentsincludegeneralprovisions，terms，basicrequirements，earthterminationsystem，

-

directstrokeprotectionsystem，equipotentialbonding，earthingandprotectionofcables，surge

protectivedevice，acceptanceandappendixes.

Theprovisionsprintedinboldtypearecompulsoryonesandmustbeenforcedstrictly.

TheMinistryofHousingandUrbanRuralDevelopmentisinchargeoftheadministrationandthe

-

explanationofthecompulsoryprovisions.TheMinistryofIndustryandInformationTechnologyisin

chargeoftheroutinemanagement.ChinaInternationalTelecommunicationConstructionCorporationis

responsiblefortheexplanationofspecifictechnicalcontents.Shallthere专用beanyneedofchangingor

supplementingduringitsimplementation，pleasesendcommentsorrecommendationstoChina

InternationalTelecommunicationConstructionCorporation（Address:No.A56Nanfangzhuang，Fengtai

District，Beijing；100079）.

DevelopmentOrganization:

ChinaInternationalTelecommunicationConstructionCorporation

Co-DevelopmentOrganizations:

HuaxinConsultingCo.，Ltd

HenanUrbanPlanningDesignandResearchInstituteCo.，Ltd

ChiefDrafters:

HouMingshengDongChunguangWangYingYeXiangyangDingHaifeng

SongLixinShenGuanxueLiJinghao

ChiefReviewers:

LiuJikeYeRongChenQiangZhaoYanSunXiaodongXuLiankun

人人文库XuWeijieZhouJingLuZhijunFengPuLiuXinmaoZhangJingming

LiuZhengzi

Translators:

ShenYunqiLiXiongZhangXuanLiXinhua

TranslationProofreaders:

WangFengwuMengYongyeWangChaoWangJian

Contents

1GeneralProvisions……………（1）

2Terms…………………………（2）

3BasicRequirements……………（4）

4EarthterminationSystem………………………（6）

-

4.1EarthingElectrodeandEarthingGrid……………（6）

4.2EarthingLead…………………（7）

5DirectStrokeProtectionSystem………………（8）

5.1AirterminationSystem…………（8）

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5.2DownconductorSystem…………（8）

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6EquipotentialBonding…………（10）

6.1EarthingBusbarandMainEarthingOmnibus………（10）

6.2EarthingofFacilities……………（10）

6.3EarthingConductor……………（10）

7EarthingandProtectionofCables……………（12）

7.1FeederLine……………………专用（12）

7.2EntryCables……………………（12）

7.3SignalCables…………………（13）

8SurgeProtectiveDevice………………………（15）

9Acceptance……………………（16）

9.1FollowupAcceptance…………（16）

-

9.2FinalAcceptance………………（16）

AppendixAMeasurementofEarthingResistance………………（19）

AppendixBFollowupinspectionFormsforLightningProtectionand

-

EarthingforTelecommunicationBureaus（Stations）………………（20）

ExplanationofWordinginThisCode……………（27）

人人文库

1GeneralProvisions

Thiscodeisdevelopedwithaviewtoenhancingthequalitysupervisionandmanagementon

1.0.1

lightningprotectionandearthingfortelecommunicationbureaus（stations），unifyingtherequirementsfor

qualityandacceptanceofengineeringconstruction，andensuringtheengineeringqualityandthesafe

operationoflightningprotectionandearthingsystems.

Thiscodeisapplicabletotheacceptanceofconstruction，extensionandrenovationoflightning

1.0.2

protectionandearthingfortelecommunicationbureaus（stations）.

Theacceptanceoflightningprotectionandearthingfortelecommunicationbureaus（stations）

1.0.3

shallcomplywithnotonlytherequirementsstipulatedinthiscode，butalsothoseinthecurrentrelevant

onesofthenation.

专用

人人文库

·1·

2Terms

Commonearthing

2.0.1

Theearthingmodemeansthatalldifferentformsofearthingfortelecommunicationinstallationsin

telecommunicationbureau（station），includingtheoperationalearthing，protectiveearthing，shield

earthing，antistaticearthing，logicearthingofITdevices，protectiveearthingofmetalbuildingmembers

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andlightningprotectionsystemsandsurgeprotectivedevices，areconnectedtogethertotheearth

electrodesinthefoundationofthebuildingandthesetearthingsystem，whicharealsosharedbythe

lightningprotectionearthingofthebuildingstructure.

Airterminationsystem

2.0.2-

Thesystemisestablishedtowithstandthedischargeofdirectlightningflashes，soastokeepthe

objectprotectedfrombeingstruck.Itconsistsofthepartsinterceptinglightningflash:lightning

conductor，airterminationstrip（wire），airterminationnet，metalroofingandmetalmember.

--

Downconductorsystem

2.0.3-

Themetalconductorsconnectingairterminationsystemandearthterminationsystem.

--

Directstrokeprotectionsystem专用

2.0.4

Thecombinationofairterminationsystemanddownconductorsystem.

--

Earthingelectrode

2.0.5

Oneorasetofconductorswhichareburiedintosoilandusedtoprovideelectricalconnectiontosoil

（theearth）.

Earthinggrid

2.0.6

Asetofinterconnectedbareconductorsburiedinearthtoprovideacommonearthingforelectrical

-

equipmentormetalstructures.

Earthinglead

2.0.7

Conductorsconnectingmainearthingomnibusandearthinggrid.

Earthterminationsystem

2.0.8-

Theintegrationofearthingleadandearthinggrid.

Equipotentialbonding

2.0.9

Thebondingofseparatedsystemsorconductiveobjectsbyusingconductorsorsurgeprotective

devicesinordertoreduce人人文库thepotentialdifferenceinducedbylightningcurrent.

Earthconductor

2.0.10

Earthconductorsarecablesusedforequipotentialbonding，whichconnectlargesizeconductive

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objectsintelecommunicationbureau（station）likeequipment，elevatorrails，hoists，metalfloors，metal

doorframes，metalpipelines，metalcabletraysandonouterwallmetalrailingtothenearestearthing

-

busbarormainearthingomnibus.

Earthingbusbar

2.0.11

Conductivebartowhichallearthconductorsareconnected.

Mainearthingomnibus

2.0.12

Mainearthingomnibusreferstocopperstriporflatsteelusedasearthingconductor.Itgenerally

·2·

actsasthetrunklineofearthingsystemintelecommunicationbureau（station）；itisclassifiedinto

horizontal，vertical，circularandstriptypesintermsoflayingmethod.

Earthingsystem

2.0.13

Acomplexsystemconsistsofallelectricalconnectionsandapparatusesforearthingofthesystems，

installationsandequipment，includingearthingelectrodesburiedintosoil，earthconductors，cable

shieldinglayersconnectedtoearthingelectrodesandotheritemsconnectedtoearthingelectrodeslike

equipmentcases，orexposedmetalpartsofequipment，steelbarsofbuildings，andframesof

infrastructures.

Rollingspheremethod

2.0.14

Thesimplifiedanalyticalmethodofelectrogeometricmodeltheoryisappliedintheanalysisof

-

lightningprotectionforbuildings.Thescopeoflightningprotectioniscalculatedbyrollingupanddown

animaginaryspherealongthesurfaceofprotectedobjectswiththesupportoflightningconductors，

lightningprotectingwires，fencesandotherearthedmetalobjects.Anyobjectundertheprotectivecurve

surfaceformedbyrollingthespherewillbeprotected；anyobjecttouchingthesphereorpiercingthe

spheresurfacewillnotbeprotected.

Earthresistivity

2.0.15

Aparametercharacterizingtheconductivityofearth，ofwhichthevalueequalstotheresistance

betweenthetwooppositesidesofoneunitcubeofsoil，thenominalunitisΩ·m.

Powerfrequencyearthingresistance专用

2.0.16

Theresistancebetweenearthingelectrodeandremoteearthwhilepowerfrequencycurrentsgo

throughtheearthterminationsystem.Itsvalueequalstotheratioofthevoltageoftheearthtermination

--

systemwithrespecttotheremoteearthtothecurrentflowedintotheearththroughearthingelectrode.

Surgeprotectivedevice（SPD）

2.0.17

Adeviceprotectingtelecommunicationsystemincaseoflightningovervoltageoroperational

overvoltage.Itprotectstheequipmentbyrestrainingtransientovervoltageandbybypassingsurge

current，anditatleastconsistsofonenonlinearelement.

人人文库

·3·

3BasicRequirements

3.0.1Commonearthingsystemmustbeappliedtotheearthingsystemintelecommunication

bureau（station）.

Thepowersupplymodeoftelecommunicationbureau（station）shallmeettherequirementsof

3.0.2

GB50689CodeforDesignofLightningProtectionandEarthingEngineeringforTelecommunication

Bureaus（Stations）.

Mainequipmentandmaterialsusedinthelightningprotectionandearthingfortelecommunication

3.0.3

bureaus（stations）shallmeetthefollowingrequirements:

Themodelsandspecificationsofequipmentandmaterialsshallmeettheengineeringdesign

1

requirements.Incaseofusingsubstitutionalmaterials，theconsentofprojectowneranddesignershallbe

obtainedandthecorrespondingformalitiesshallbeprocessedpriortousingsuchmaterials.

Opencaseinspectionstoequipmentandmaterialsshallbeexecuted，theequipmentand

2-

materialsshallnotbeusedbeforetheyareinspectedandqualified.

Outdoorsteelpartsandfasteningpiecesshallbehotgalvanizedorstainlesssteelproducts.

3-

Thegalvanizedproductsshallhavecompleteandintactzinccoatings专用andrustlesssurfaces.

4

Thecontactsurfacesofboltsshallbethoroughlypolished，andantilooseaccessoriesshallbe

3.0.4-

used，ifboltsareusedinlightningprotectionandearthingsystems.

Ifweldingprocessisadoptedasconnectingorfixingmeansforlightningprotectionandearthing

3.0.5

systems，nonconductivecoatingsontheobjectstobeweldedsuchaspaint，varnish，oilandporcelain

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glazeshallberemoved，firmandthoroughweldingshallbesecured.Weldingseamshallbefulland

smooth，falseweldingorbubbleatweldjointsshallnotbeallowed.

Ifsteelmaterialsareconnectedbyusingoverlapwelding，theoverlappinglengthandwelding

3.0.6

methodshallmeetthefollowingrequirements:

Foroverlappingflatsteels，theoverlappinglengthshallbenolessthan2timesthewidthofthe

1

flatsteel，andatleastthreesidesshallbewelded；

Foroverlappingroundsteels，theoverlappinglengthshallbenolessthan10timesthediameter

2

oftheroundsteelwiththegreaterdiameter，andtwosidesshallbewelded；

Foroverlappingroundsteelandflatsteel，theoverlappinglengthshallbenolessthan10times

3

thediameterofthe人人文库roundsteel，andtwosidesshallbewelded；

Foroverlapweldingflatsteelandanglesteel，thebroadsideofflatsteelshallbecontacted

4-

closelyagainsttheoutersideoftheanglesteel，andtwosidesshallbewelded；

Forweldingflatsteelandsteelpipe，bothsidesofthecontactedpositionshallbewelded；in

5

addition，anarcclampmadeofflatsteelshallbeweldedtothesteelpipeforreinforcement；Ortheflat

steelitselftobeshapedintoanarcshallbeweldedtothesteelpipe，soastoguaranteethatmorethan3/4

ofthetorussurfaceofthepipeisweldedandcontactedwiththeflatsteel.

Anticorrosivetreatmentshallbemadetoanycoatingdamageandweldingpointonmetal

3.0.7-

surfaceinlightningprotectionandearthingsystems.Suchtreatmentshouldbemadebyapplying

anticorrosivepaintslikeasphaltorantirustpaints.Beforeapplyingtheanticorrosivepaints，dust，oil

-

·4·

stains，oxideskins，rustlayers，contaminantsandsheddingoldpaintfilmsonmetalsurfacesaswellas

weldingscalesatweldingpointsshallbecleanedup.Anticorrosivecoatingshallbeevenlyandfirmly

-

brushedover，andanymissingcoating，wrinkle，peeling，delamination，sagorbubbleshallnotbeallowed.

Iftheexothermicweldingisadoptedasconnectingandfixingmeansforlightningprotectionand

3.0.8

earthingsystem，thefusionjointshalltotallycoverthebondingpartoftheconductorbeingconnected，it

shallbeguaranteedthatthemetalatthebondingpartistotallymelted，hencetheconnectionisfirmand

reliable.

专用

人人文库

·5·

4Earth-terminationSystem

4.1EarthingElectrodeandEarthingGrid

Theposition，lengthandspacingofearthingelectrodeandtheinstallationmethodofearthing

4.1.1

gridshallmeettheengineeringdesignrequirements.

Theearthinggridsforbuildingsandtowersinatelecommunicationbureau（station）shallbe

4.1.2

connectedbyusinghorizontalearthingelectrodesatmultiplepoints.

Ifpowertransformerisinstalledintheequipmentroom，itshallbeearthedthroughthecommon

4.1.3

earthinggrid.Ifsuchtransformerisinstalledatoutdoorlocationoftheequipmentroomandtheedgeof

itsearthinggridislessthan30mawayfromtheedgeofthecommonearthinggrid，itsearthinggridshall

beweldedtoandconnectedtothecommonearthinggridbyusinghorizontalearthingelectrodes.

Earthingelectrodesshallbekeptawayfromsewageoutletsandstronglycorrosivesoil.

4.1.4

Pitsandditchesforearthingelectrodesshallbeexcavatedoutsidetheapronareaandkeptmore

4.1.5

than1mawayfromthebuildingfoundation.

Ifanearthingelectrodecrossesoverorisparalleltoburiedpowercablesortelecommunication

4.1.6

optical（electrical）cables，asafedistancebetweentheearthingelectrode专用andthosecablesshallbekept

accordingtothedesignrequirements.Iftheearthinggridpassingthroughanenclosurewall，afoundation

orcrossingadirectlyburiedcable，reinforcementorprotectionmeasuresshallbetakenaccordingtothe

-

designrequirements.

Theearthingelectrodeshallbeburiedintosoilwithitsupperendbeingnolessthan0.7mbelow

4.1.7

thegroundsurface；incoldareas，itshallbeburiedintosoilbelowthefrozensoillayer.Inspecialareas

suchasthosewithpermanentfrozenlayer，theburieddepthshallmeetthedesignrequirements.Inthe

thinsoilareasorareaswithlargeproportionofgravelsandrocks，theburieddepthmaybedetermined

accordingtospecificconditions，buttheearthingelectrodeshouldnotbeexposed.

Horizontalearthingelectrodesshallbeburiedinditchesandlaidstraightlyandevenly；vertical

4.1.8

earthingelectrodesmadeofsteelshouldbedirectlydrivenintotheditchatuniformintervalsofnoless

than2timesoftheelectrodelength.Verticalelectrodesmadeofothermaterialsshouldbeburiedinpits.

Horizontalandverticalearthingelectrodesshouldbeweldedtogether.

Circularearthingelectrodesshallbeconnectedatmultiplepointswiththeearthinggridin

4.1.9

buildingfoundation人人文库，reliableelectricalconnectionsbetweenthecircularearthingelectrodesandmetal

pipelinesystems（watersupplypipesandsewagepipes）orothermetalconductorsenteringthebuilding

shallbesecured.

Othercablesshouldnotbelaidinditchesdedicatedforearthingelectrodes.

4.1.10

Pitsandditchesforearthingelectrodesshallnotbebackfilledwithstronglycorrosivesoil.Itis

4.1.11-

thelowresistancesoilthatshallbeused，andthesoilshallnotcontainstonesorconstructionwastes.

-

Ifresistancereducingagentsareusedatregionswithhighsoilresistivity，theyshallevenly

4.1.12

enwraptheearthingelectrodes.

Thetestpointsforearthresistanceofearthinggridshallbeconspicuouslymarkedwiththe

4.1.13

black"¤"symbolsagainstawhitebackground.

·6·

Theearthingresistanceorthesizeofearthinggridshallmeettheengineeringdesign

4.1.14

requirements.TheearthingresistanceshallbetestedwiththemethodspecifiedinAppendixA.

4.2EarthingLead

Thequantityandlocationofearthingleadshallmeetthedesignrequirements.

4.2.1

Earthingleadshouldnotbelaidwithheatingpipesinthesameditch，andtheearthingleadshall

4.2.2

beburiedinditchawayfromthoseofsewagepipesandwaterditches.

Thebondingpointofearthingleadandearthinggridshallavertfromthemainlightningcurrent

4.2.3

dischargepointsofdownconductorsystemandtowerfoundationalike.

-

Earthingleadandearthingelectrodeshallbeweldedtogether.

4.2.4

Theearthingleadshallbeprotectedbyusinggalvanizedsteelpipeorgalvanizedanglesteeland

4.2.5

implementedwithanticorrosivetreatmentonsuchlocationsaswheretheearthingleadextrudingoutof

-

thegroundortheearthingleadintersectingwithroads.

Earthingleadshallbeprotectedbyusingprotectivesleevewhiletheearthingleadgoingthrough

4.2.6

wallorfloorslab.Theprotectivesleeveshallextendoutofthewall10mm，andtheprotectivesleeve

shallextendoutofthefloorslab30mmoverthefloorand10mmbelowthefloor；Theprotectivesleeve

goingthroughexteriorwallshallbeinstalledinafallingtrendwiththeinteriorendhigherthanthe

exteriorend，theheightdifferenceshouldbepreferably10mm；Atwallcorner，theouteredgeofsleeve

shouldbe15mm-20mmawayfromthesidewallsurface.Themouthof专用protectivesleeveshallbesealed

withfireproofingandsealingmaterial.

Theearthingleadshallbefixedfirmlyandreliably，eachfastenerormountingsupportshallbe

4.2.7

capableofbearingtheverticaltensionof49N；Thespacingbetweenfastenersormountingsupports

shallberegular，thespacingbetweenthematstraightsectionsshouldbenogreaterthan2m，andno

greaterthan0.5matanyturns.

Theindoorflatsteelearthingleadlaidonthefloorshouldbecoatedwith15mm-100mmwide

4.2.8--

yellowgreenstripsintervalley，orbewrappedwithyellowgreentape.

--

人人文库

·7·

5DirectStrokeProtectionSystem

5.1Air-terminationSystem

Theinstallationpositionsandheightsoflightningrods，theinstallationpositionsoflightning

5.1.1

stripsandthemeshsizeoflightningnetworkshallmeettheengineeringdesignrequirements.

Exposedairterminationsystemshallbemadeofanticorrosivematerialsorbeprotectedby

5.1.2--

usinganticorrosivetreatment.

-

Airterminationsystemsshallbeconnectedviawelding，andunderthecircumstancewhere

5.1.3-

weldingconditionsarenotavailabletheyshallbeconnectedaccordingtothedesignrequirements.

Lightningrodshallbefixedverticallyandfirmly.Reliableandfirmconnectionshallbesecured

5.1.4

betweentherodanditsfoundation，andbetweentherodandotherelements.

Theconductorsoflightningstripandlightningnetworkshallbesmoothandstraight，the

5.1.5

conductorsmustnotbeexcessivelydistorted，bendedordeformed；theexpansionallowanceof100mm-

200mmshallbereservedatdeformationjointsofthebuilding.

Theconductorsoflightningstripandlightningnetworkshallbereliablyandfirmlyfixed，each

5.1.6

fastenerandmountingsupportshallbecapableofbearingtheverticaltensile专用forceof49N.Thespacing

betweenfastenersormountingsupportsshallberegular，thespacingbetweenthematstraightsections

shouldbenogreaterthan2m，andnogreaterthan0.5matanyturn.Theheightofmountingsupport

shouldbenolessthan150mm，themountingsupportsshallnotbeinstalledorfixedatthelocations

wherethelightningstripconnectswiththelightningnetwork.

Theprotectionscopeofairterminationsystemshallmeettheengineeringdesignrequirements，

5.1.7-

andtherelevantchecksandinspectionsmaybeexecutedbyusingtherollingspheremethodorthe45°

anglemethod.

5.2Down-conductorSystem

Thequantityandinstallationpositionofthedownconductorsystemshallmeettheengineering

5.2.1