GB 50257-2014 GB50257-2014電氣裝置安裝工程．爆炸和火災(zāi)危險環(huán)境電氣裝置施工及驗(yàn)收規(guī)范:英文

GB50257-2014

CODEFORCONSTRUCTIONANDACCEPTANCE

OFELECTRICEQUIPMENTONFIRE

ANDEXPLOSIONHAZARD

ELECTRICALEQUIPMENTINSTALLATIONENGINEERING專用

電氣裝置安裝工程

爆炸和火災(zāi)危險環(huán)境電氣裝置施工及驗(yàn)收規(guī)范

人人文庫

IssuedonDecember2，2014ImplementedonAugust1，2015

itheMinistryofHousingandUrban-RuralDevelopment（MOHURD）

andtheGeneralAdministrationofQualitySupervision，Inspection

350.00andQuarantineof（AQSIQ）thePeople'sRepublicofChina

NATIONALSTANDARD

OFTHEPEOPLE'SREPUBLICOFCHINA

CODEFORCONSTRUCTIONANDACCEPTANCE

OFELECTRICEQUIPMENTONFIRE

ANDEXPLOSIONHAZARD

ELECTRICALEQUIPMENTINSTALLATIONENGINEERING

GB50257-2014

DevelopedbyChinaElectricityCouncil

ApprovedbyTheMinistryofHousingandUrbanRuralDevelopmentofthe

-

People'sRepublicofChina專用

ImplementationDateAugust1，2015

人人文庫

ChinaPlanningPress

Beijing2021

ChineseeditionfirstpublishedinthePeoplesRepublicofChinain2014

EnglisheditionfirstpublishedinthePeoplesRepublicofChinain2021

byChinaPlanningPress

rd專用

3Floor，CTower，GuohongBuilding

No.A11，Muxidi-Beili，XichengDistrict

Beijing，100038

PrintedinChinabyBeijingJingyintangGraphicPrintingCenter

?2014bytheMinistryofHousingandUrban-RuralDevelopmentof

thePeoplesRepublicofChina

Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformor

byanymeans，graphic，electronic，ormechanical，includingphotocopying，recording，

oranyinformationstora人人文庫geandretrievalsystems，withoutwrittenpermissionofthepublisher.

Thisbookissoldsubjecttotheconditionthatitshallnot，bywayoftradeorotherwise，belent，

resold，hiredoutorotherwisecirculatedwithoutthepublisherspriorconsentinanyformof

blindingorcoverotherthanthatinwhichthisispublishedandwithoutasimilarcondition

includingthisconditionbeingimposedonthesubsequentpurchaser.

ISBN978-7-5182-1368-9

中華人民共和國住房和城鄉(xiāng)建設(shè)部公告

2020年第13號

住房和城鄉(xiāng)建設(shè)部關(guān)于發(fā)布《建設(shè)工程施工現(xiàn)場供用

電安全規(guī)范》等10項(xiàng)工程建設(shè)標(biāo)準(zhǔn)英文版的公告

現(xiàn)批準(zhǔn)《建設(shè)工程施工現(xiàn)場供用電安全規(guī)范》（GB50194-2014）、《電氣裝置安裝工程起

重機(jī)電氣裝置施工及驗(yàn)收規(guī)范》（GB50256-2014）、《電氣裝置安裝工程電力變流設(shè)備施

工及驗(yàn)收規(guī)范》（GB50255-2014）、《電氣裝置安裝工程爆炸和火災(zāi)危險環(huán)境電氣裝置施

工及驗(yàn)收規(guī)范》（GB50257-2014）、《電氣裝置安裝工程66kV及以下架空電力線路施工及專用

驗(yàn)收規(guī)范》（GB50173-2014）、《有色金屬選礦廠工藝設(shè)計(jì)規(guī)范》（GB50782-2012）、《工業(yè)建

筑供暖通風(fēng)與空氣調(diào)節(jié)設(shè)計(jì)規(guī)范》（GB50019-2015）、《地下水封石洞油庫施工及驗(yàn)收規(guī)

范》（GB50996-2014）、《煉油裝置火焰加熱爐工程技術(shù)規(guī)范》（GB/T51175-2016）、《石油

化工企業(yè)總圖制圖標(biāo)準(zhǔn)》（GB/T51027-2014）等10項(xiàng)工程建設(shè)標(biāo)準(zhǔn)英文版。工程建設(shè)標(biāo)

準(zhǔn)英文版與中文版出現(xiàn)異議時，以中文版為準(zhǔn)。

工程建設(shè)標(biāo)準(zhǔn)英文版由住房和城鄉(xiāng)建設(shè)部組織中國計(jì)劃出版社出版發(fā)行。

中華人民共和國住房和城鄉(xiāng)建設(shè)部

2020年1月14日

人人文庫

AnnouncementoftheMinistryofHousingandUrban-Rural

DevelopmentofthePeople'sRepublicofChina

No.594

AnnouncementoftheMinistryofHousingandUrbanRuralDevelopmenton

-

PublishingNationalStandardofCodeforConstructionandAcceptanceof

ElectricEquipmentonFireandExplosionHazardElectrical

EquipmentInstallationEngineering

CodeforConstructionandAcceptanceofElectricEquipmentonFireandExplosionHazard

ElectricalEquipmentInstallationEngineeringhasbeenapprovedasanationalstandardwithaserial

numberofGB50257-2014，andwillbeimplementedonAugust1，2015.Inthiscode，Articles（Items）

5.1.3，5.1.7，5.2.1，5.4.2（1），7.1.1and7.2.2aremandatoryonesandmust專用beimplementedstrictly.The

formereditionofthestandardGB50257-96CodeforConstructionandAcceptanceofElectricDevice

forExplosionAtmospheresandFireHazardElectricalEquipmentInstallationEngineeringwillbe

cancelledandreplacedaccordingly.

AuthorizedbytheResearchInstituteofStandardsandNormsofMinistryofHousingandUrban

-

RuralDevelopmentofthePeople'sRepublicofChina，thiscodeispublishedanddistributedby

ChinaPlanningPress.

MinistryofHousingandUrbanRuralDevelopmentofthePeople'sRepublicofChina

-

December2，2014

人人文庫

Foreword

ThiscodeisarevisionofGB50257-96CodeforConstructionandAcceptanceofElectricDevice

forExplosionAtmospheresandFireHazardElectricalEquipmentInstallationEngineeringmadeby

theChinaElectricityCouncilandStateNuclearPowerEngineeringCompany（SNPEC）incooperation

withtheorganizationsconcerned，accordingtotherequirementsofDocumentJIANBIAO〔2009〕No.88

issuedbytheMinistryofHousingandUrbanRuralDevelopmentofthePeople'sRepublicofChina

-

（MOHURD）—"NoticeonPrintingandDistributing'theDevelopmentandRevisionPlanofNational

EngineeringConstructionStandardsin2009'".

Intheprocessofrevision，therevisionpanelsummarizednewrequirementsforandrelevant

scientificresearchandfieldpracticeexperienceinconstructionandacceptanceofelectricequipmenton

fireandexplosionhazardsinceGB50257-96CodeforConstructionandAcceptanceofElectricDevice

forExplosionAtmospheresandFireHazardElectricalEquipmentInstallationEngineeringwas

implemented，andcollectedwidecommentsfrominterestsconcerned.

Thiscodeconsistsof8chaptersand1appendix，covering：generalprovisions，terms，basicrequire-

ments，installationofexplosionproofelectricalequipment，electricalcircuit專用forexplosiveatmosphere，

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electricalequipmentinfirehazardousenvironment，grounding，andprojectacceptanceetc.

Ascomparedwiththeoriginalcode，thefollowingmainamendmentsaremadeinthisrevision：The

twochapters"Terms"and"BasicRequirements"areadded，provisionsinsomechaptersaremodified，

articlesthatdonotreflectthecurrenttechnicalprogressaredeleted.

Theprovisionsprintedinboldtypearemandatoryonesandmustbeimplementedstrictly.

Thiscodeisunderthejurisdictionof，anditsmandatoryprovisionsareinterpretedbytheMinistry

ofHousingandUrbanRuralDevelopmentofthePeople'sRepublicofChina，ChinaElectricityCouncil

-

isresponsibleforitsroutinemanagement，andSNPECisinchargeoftheexplanationoftechnical

specifications.Therlevantopinionsandadvicewhenevernecessarycanbepostedorpassedonto

e，，

SNPEC（Address：BuildingNo.2，No.888TianlinRoad，MinxingDistrict，Shanghai，Postcode：200233）

forreferenceincaseofrevisioninthefuture.

ChiefDevelopmentOrganizations，CoDevelopmentOrganizations，ChiefDrafters，ChiefReviewers

-

andMainTranslatorsofthiscodeareasfollows：

ChiefDevelopmentOrganizations:

人人文庫ChinaElectricityCouncil

StateNuclearPowerEngineeringCompany

Co-DevelopmentOrganizations:

ChinaGezhoubaGroupElectricPowerCo.，Ltd.

ShandongElectricPowerTransmission&SubstationEngineeringCo.，Ltd.

TianjinElectricPowerConstructionCompany

NanyangExplosionProtectedElectricalApparatusResearchInstitute

ChinaHelonExplosionproofElectricCo.，Ltd.

-

·1·

ChiefDrafters:

SUNKebinZOUYingnanTIANXiaoGEZhanyuGAOPengfeiLICong

JINGJinWANGGengZHANGGangXIEShaojian

ChiefReviewers:

XUJunZHOUYongliZHUZhiqiangWANGGuominWANGMin

LIUJunBAIYongLIUYujieZHOUJianWANGJian

LIDaolinHEZhijiangQINJianqing

MainTranslators:

LIQishengZENGQingyuYOUXiangfeiXUJunPANGYouyiJINGJin

LIUJianxia

專用

人人文庫

2··

Contents

1Generalprovisions……………………（1）

2Terms……………………（2）

3Basicrequirements……………………（4）

4Installationofexplosionproofelectricalequipment…………………（6）

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4.1Generalrequirements……………………（6）

4.2Installationofflameproofelectricalequipment……………（6）

4.3Installationofincreasedsafetyandtypeofprotection"n"……………………（7）

4.4Installationofpressurization"p"…………（8）

4.5Installationofoilimmersion"o"…………（8）

4.6Installationofintrinsicsafety"i"…………（9）

4.7Installationoftypeofdustex……………（9）

-

5Electricalcircuitforexplosiveatmosphere…………（11）

5.1Generalrequirements……………………（11）

5.2Cablingroutingforexplosiveatmosphere…………………（12）

5.3Cableandwiringinconduitforexplosiveatmosphere專用………（13）

5.4Circuitofintrinsicsafety"i"equipmentandassociatedequipment……………（15）

6Electricalequipmentinfirehazardousenvironment…………………（16）

6.1Generalrequirements……………………（16）

6.2Installationofelectricalequipment………………………（16）

6.3Electricalcircuit…………………………（16）

7Grounding………………（18）

7.1Protectivegrounding……………………（18）

7.2Electrostaticproofgrounding……………（18）

8Projectacceptance………………………（20）

AppendixAElectricalclearanceandcreepagedistancebetweenexposedliveparts，

aswellasbetweenexposedlivepartsandmetalenclosureofthe

explosionproofelectricalequipment……………………（21）

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Explanationofwordinginthiscode………………………（24）

Listofquotedstandards……………………（25）

Addition：Explanation人人文庫ofprovisions………………………（27）

1Generalprovisions

1.0.1Thiscodeisformulatedwithaviewtoensuringsatisfactoryinstallationandsafeoperationof

electricalequipmentinenvironmentsexposedtoexplosionandfirehazards，promotinginstallation

technologies，andensuringthesafetyofpeopleandproperty.

1.0.2Thiscodeappliestoconstructionandacceptanceofelectricalequipmentinareaswhere

explosivemixtureofgas，vapor，dustandfiberormaterialsthatmayleadtofireexistormayexistduring

production，processing，treatment，handlingorstorage.

1.0.3Thiscodedoesnotapplytoconstructionandacceptanceofelectricalequipmentinthefollowing

atmospheres：

1Undergroundmines.

2Placeswheregunpowder，explosives，primerandfusearemanufactured，usedorstoredor

whereinitiatingexplosivedevicesaremanufactured.

3Areasaccommodatingelectricalequipmentusedforelectrolysisandelectroplatingin

productionaswellasdirectlylinkedtotheproductionprocess.

4Atmosphereswherestrongoxidantisusedandmaterialscanfire專用withoutanexternaligniting

source.

5Land，waterandairtransportationvehiclesaswellasoffshoreandonshoreoilplatforms.

6Nuclearislandinanuclearpowerplant.

7Pipelinesusingodorizednaturalgasasthefuelforheating，airconditioning，cookingand

washingaswellassimilarpipelines.

8Medicaltreatmentrooms.

9Disastrousaccidents.

1.0.4Notonlytherequirementsstipulatedinthiscode，butalsothoseinthecurrentrelevantonesof

thenationshallbecompliedwith.

人人文庫

·1·

2Terms

2.0.1Explosiveatmosphere

Mixturewithair，underatmosphericconditions，offlammablesubstancesintheformofgases，

vapors，dusts，hazes，fibersorflyingsinwhich，afterignitionhasoccurred，combustionspreadstothe

entireunburnedmixture.

2.0.2Explosivedustatmosphere

Mixturewithair，underatmosphericconditions，offlammablesubstancesintheformofdusts，fibers

orflyingsinwhich，afterignitionhasoccurred，combustionspreadstotheentireunburnedmixture.

2.0.3Explosivegasatmosphere

Mixturewithair，underatmosphericconditions，offlammablesubstancesintheformofgasesor

vaporsinwhich，afterignitionhasoccurred，combustionspreadstotheentireunburnedmixture.

2.0.4Hazardousarea

Anareainwhichtheexplosivemixtureexistingorexpectedtoexistisinsuchanamountthat

specialmeasuresneedtobetakenforthestructure，installationanduseofelectricalequipment.

2.0.5Zone0專用

Anareainwhichexplosivegasmixtureispresentcontinuouslyorforlongperiods.

2.0.6Zone1

Anareainwhichexplosivegasmixtureislikelytoappearinnormaloperation.

2.0.7Zone2

Anareainwhichexplosivegasmixtureisnotlikelytoappearinnormaloperation，orevenit

appears，itwillexistonlyforashorttime.

2.0.8Zone20

Anareainwhichdustcloudinairispresentinanexplosiveatmospherecontinuously，forlong

periodsorfrequently.

2.0.9Zone21

Anareainwhichdustcloudinairisverylikelytooccurinanexplosiveatmosphereinnormal

operationoccasionally.

2.0.10Zone22

Anareainwhichdustcloudinairisunlikelytooccurinanexplosivedustatmosphere，orevenifit

doesoccur，itwill人人文庫onlyexistforashorttime.

2.0.11Typeofprotection

Specificmeasuresappliedtoelectricalequipmenttoavoidignitionofasurroundingexplosive

atmosphere.

2.0.12Intrinsicsafety"i"

Atypeofprotectionbasedupontherestrictionofelectricalenergywithinequipmentandof

interconnectingwiringexposedtoanexplosiveatmospheretoalevelbelowthatwhichcancause

ignitionbyeithersparkingorthermaleffect.

Intrinsicallysafecircuit

2.0.13-

·2·

Acircuitinwhichanysparkorthermaleffectproducedinnormaloperationandspecifiedfault

conditionsisnotcapableofignitingagivenexplosivegasatmosphere.

Intrinsicallysafeelectricalequipment

2.0.14-

Electricalequipmentinwhichallthecircuitsareintrinsicallysafe.

2.0.15Associatedelectricalequipment

Electricalequipmentwhichcontainsbothintrinsicallysafecircuitsandnonintrinsicallysafecircuits

-

andisconstructedsothatthenonintrinsicallysafecircuitscannotadverselyaffecttheintrinsicallysafe

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circuit.

2.0.16Pressurization"p"

Atypeofprotectionagainsttheingressoftheexternalexplosivegasintoanenclosureoraroomby

maintainingprotectivegasthereinatapressureabovethatoftheexternalatmosphere.

2.0.17Oilimmersion"o"

Atypeofprotectionwhereelectricalequipmentorpartsofelectricalequipmentareimmersedin

protectivefluidinsuchawaythatanexplosivegasatmospherewhichmaybeabovetheliquidoroutside

theenclosurecannotbeignited.

2.0.18Typeofprotection"n"

Atypeofprotectionappliedtoelectricalequipmentsuchthat，innormaloperationandincertain

specifiedabnormalconditions，itisnotcapableofignitingasurroundingexplosivegasatmosphere.

2.0.19Flameproofenclosure"d"專用

Atypeofprotectioninwhichtheenclosureofelectricalequipmentcanbearanyexplosionof

explosivemixtureenteringtheelectricalequipmentthroughanyjointsurfaceoftheenclosureor

structuralgapwithoutdamageandwillnotigniteanexternalexplosivegasatmospherecontainingone

ormorekindsofgasorsteam.

2.0.20Increasedsafety"e"

Atypeofprotectioninwhichelectricalequipmentisprotectedwithsomeadditionalmeasuresto

improveitssafetyandtopreventtheoccurrenceofhazardoustemperature，arcandsparksinnormal

operationorincertainspecifiedabnormalconditions.

Notes：1Thistypeofprotectionisexpressedwith"e"，andtheadditionalmeasuresarethosecomplyingwithrequirementsforsuchtypeof

protection.

2Thedefinitionofincreasedsafety"e"doesnotcovertheequipmentproducingsparksorarcduringnormaloperation.

人人文庫

·3·

3Basicrequirements

3.0.1Installationofelectricalequipmentinexplosionandfirehazardousenvironmentshallbecarried

outincompliancewithapproveddesigndocuments.

3.0.2Transportationandstorageofelectricalequipmentandcomponentsshallsatisfyrequirements

setforthinthemanufacturer'stechnicaldocuments.

3.0.3Equipmentandcomponentsusedshallbeaccompaniedwithcertificateofconformity.The

equipmentshallhaveanameplateandanexplosionprooflabelifitisapieceofexplosionproof

--

equipment.

3.0.4Theequipmentandcomponentsshallbeinspectedandaccepteduponarrivalatthesiteandshall

complywiththefollowingrequirements：

1Thepackageandsealingshallbeingoodcondition.

Unpacktocheckthespecificationsandexplosionproofmarkforcompliancewiththedesign

2-

requirements，andaccessoriesandsparepartsforcompleteness.

3Manufacturer'stechnicaldocumentsshallbecomplete.

4Thenameplateofexplosionproofelectricalequipmentshall專用havetheexplosionproof

--

certificatenumberissuedbyacompetentinspectionagency.

5Nodamage，corrosionormoistureshallbefoundduringvisualinspection.

3.0.5Worksafetymeasuresforconstructionshallcomplywithrequirementssetforthinthiscodeand

manufacturer'stechnicaldocuments.Inexpansionorrenovationprojects，thesite'ssafetyrulesrelated

toconstructionshallbefollowed.Forimportantprocesses，specialsafetymeasuresandwork

instructionsshallbeworkedoutbeforehand.

3.0.6Constructionofbuildingsassociatedwithinstallationofelectricalequipmentinexplosionandfire

environmentshallmeetthefollowingrequirements：

1Theconstructionqualityofbuildingsandstructuresshallmeettherelevantprovisionsinthe

currentnationalstandardGB50300UnifiedStandardforConstructionalQualityAcceptanceof

BuildingEngineering.Thequalityshallalsosatisfythespecialrequirements（ifany）placedbythe

equipmentordesign.

2Priortoinstallationofelectricalequipment，buildingengineeringshallmeetthefollowing

requirements：

1）Foundations人人文庫andframesshallcomplywithdesignrequirementsandhavepassedacceptance.

2）Theindoorfoundationshallbecompletedandtheelevationmarkedonthewall.

3）Embeddedpartsandreservedholesshallcomplywithdesignrequirements.Embedded

electricalpipelinesshallnotbemissingorcloggedandembeddedpartsshallbesecured.

4）Plasteringanddecorationworksthatmightdamageorseverelycontaminateelectrical

equipmentshallbecompleted.

5）Thesiteshallbeclean.

6）Windowsanddoorsshallbeinstalled.

3Afterinstallationandbeforecommissioning，thebuildingengineeringshallmeetthefollowing

·4·

requirements：

1）Repairofdefectsanddecorationworksshallbecompleted.

2）Secondarygroutingandplasteringworksshallbecompleted.

3）Theventilationsystemforexplosionpreventionandexplosiveleakagecontrolsystemshall

complywithdesignrequirementsandoperateasexpected.

4）Worksthatcannotbeperformedormayjeopardizeoperationalsafetyaftertheequipmentis

energizedshallhavebeencompletedandpassedacceptance.

5）Luminaireshallhavebeenputintoservice.

3.0.7Exceptanchorbolts，allironfastenersandsupportsusedforequipmentinstallationshallbe

galvanized.

3.0.8Classificationofexplosivegasatmosphere，explosivedustatmosphereandfirehazardousareas

shallcomplywiththecurrentnationalstandardsGB50058CodeforDesignofElectricalInstallations

inExplosiveAtmospheresandGB50016CodeforFireProtectionDesignofBuildings.

Thetype，class，group，environmentalconditionsandspeciallabelsofexplosionproofelectrical

3.0.9-

equipmentshallcomplywithdesignrequirements.

Explosionproofelectricalequipmentshallhavean"Ex"labelandanameplatewhichindicates

3.0.10-

itstype，class，groupaswellastheexplosionproofcertificatenumber.

-專用

人人文庫

·5·

4Installationofexplosion-proofelectricalequipment

4.1Generalrequirements

Installationofexplosionproofelectricalequipmentshallcomplywithcurrentnationalstandards

4.1.1-

GB3836.15：，and

ElectricalAtmospheres-Part15ElectricalInstallationDesignSelectionandErection

GB12476ElectricalApparatusforUseinthePresenceofCombustibleDustaswell.

Explosionproofelectricalequipmentshouldbeinstalledonsecuredmetallicsupports.

4.1.2-

Tighteningboltspossessingantilooseningdevicesshallbeusedforelectricalequipmentwithvibration.

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Afterwiresofexplosionproofelectricalequipmentarefixedinsidetheterminalbox，the

4.1.3-

electricalclearanceandcreepagedistancebetweenbarelivepartsandclearancesbetweenbareliveparts

andmetallicenclosureshallnotbelessthanthevaluesspecifiedinAppendixAofthiscode.

4.1.4Cableentryshallbekeptintactandtheelasticsealwashershallbeofgoodsealingperformance

whencablesorconductorsareledtotheexplosionproofelectricalthroughthecableinlet.And

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compressionelementsshallbefixedwithpropertoolsandthecableinletbesealedwell.Theelasticseal

washer，metallicgasketandsealsforothercableinletsshallbecompleteandsecuredtokeeptheinlets

sealed.專用

4.1.5Transparentplasticcomponentsandotherplasticcomponentsshallnotbewashedwithsolvent.

4.1.6Thebuttonofemergencyventilationshallbeinstalledinaneasilyaccessibleplaceandclearly

marked.

4.1.7Installationofluminaireshallcomplywiththefollowingrequirements：

1Thetype，modelandpowershallcomplywiththedesignandmanufacturer'stechnical

documentsandshallnotbechangedwithoutapproval.

Screwtypelampsshallbetighteningscreweduptoensuregoodcontactwithoutlooseness.

2-

3Outercoversoflampsshallbecompleteandtheboltsshallbetightened.

4.1.8Protectionofelectricalequipmentexposedtoexplosionhazardshallcomplywithdesign

requirements.

4.2Installationofflameproofelectricalequipment

4.2.1Beforeinstallation，flameproofelectricalequipmentshallbeinspectedinaccordancewiththe

followingrequirements：

1Thespecifications人人文庫ofelectricalequipmentshallcomplywithdesignrequirementsandthe

nameplateandexplosionprooflabelshallbecorrectandclear.

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2Theenclosureshallbefreeofcracksanddamages.

3Theflameproofstructureandclearanceshallmeettherequirements.

Theboltsconnectingjointsurfacesshallbecomplete，andthespringwashersandotheranti

4