臨時用電方案

臨時用電方案

TemporaryElectricalConstructionPlanI.ProjectOverviewThisprojectisaresidentialbuildingwithaframestructure.II.BasisforPreparation"TechnicalSpecificationsforSafetyofTemporaryElectricityinConstructionSite,""SafetySpecificationsforPowerSupplyinConstructionSiteofConstructionProjects,""SafetyInspectionStandardsforConstructionProjects,"and"TechnicalSpecificationsforConstructionElectricityStandards"arethebasisforthisplan.III.LayoutofDistributionSystem1.SelectionofSystemFormThisprojectusestransformerdirectpowersupply.Basedonthelocationandquantityofelectricalequipmentontheconstructionplanandthesiteconditions,adistributionsystemofradial,trunk,ormixedtypeisproposed.Theradialtypeisusedfromthedistributionboxtotheelectricalequipmenttoensurethatthereisnointerferencebetweentheequipment.2.CableLayingExceptforthelightingbranchcircuitinthefieldareaandthemobiledistributionboxledbythemaindistributionbox,thedistributiontrunklineusesafive-corerubberinsulatedcable.Themobiledistributionboxandeachbranchlineusearubberinsulatedcable.3.SelectionofElectricalEquipment(1)Themaindistributionboxandthedistributionboxesareequippedwithatotalautomaticairswitchandabranchautomaticairswitchoraknifeswitch.Theworkingcurrentoftheelectricalequipmentusesanautomaticairswitch.Theautomaticairswitchusesaknifeswitchtype.(2)Eachelectricalequipmenthasitsowndedicatedswitchbox,implementingthe"onemachine,oneswitch,oneleakage,onebox"system.(3)Themaindistributionboxisequippedwithavoltmeterandanammeter.(4)Lightingandpowershareonedistributionbox,butseparatecircuitsaresetup.Eachlightingpartofthedistributionboxisequippedwithatwo-stageleakageprotectorandaknifeswitch.IV.ProtectionDevicesofDistributionSystem(1)TheentiresystemadoptsaTN-Sthree-phasefive-wireprotectivegroundingsystem.Aredundantgroundingismadeatthemaindistributionbox,andthegroundingresistanceislessthan10ohms.Theprotectivewireusesayellow-greenBVR2.5squaremillimetermulti-strandcoppersoftwire,whichisdirectlyburied.Allelectricalequipmentanddistributionboxesareprotectedbygrounding.(2)Whileadoptingprotectivegrounding,aleakageprotectorisalsosetup,implementingthree-leveldistributionandtwo-levelprotectionforthemaindistributionbox,distributionboxes,andswitchboxes.Themainboxusesaleakageprotector.Theratedleakageactioncurrentoftheleakageprotectorusedintheswitchboxisnotgreaterthan30MA,andtheratedleakageactiontimeislessthan0.1S.V.ConstructionEquipmentTowercranes,rebarcutters,cuttingmachines,mixers,electricsaws,planers,electricwelders,vibrationrods,platevibrators,hoists,grinders,benchdrills,bendingmachines,andweldingmachines.VI.TechnicalMeasuresforInstallationofElectricalEquipment1.CableLayingMethod:Thecableisburied600mmbelowthenaturalgroundoutdoorsandcoveredwith50mmthickfinesandevenlyonthetopandbottomofthecable.Thencoveritwithbricksforprotection.Whenthecableisledoutoftheground,aflame-retardantPVCplasticsleeveisusedforprotectionfrom200mmbelowthegroundtoasectionofthedistributionbox.Themobiledistributionboxisprotectedbyplasticpipeswhenlaidwithscaffolding.2.Thesettingofelectricalequipmentshouldmeetthefollowingrequirements:(1)Inthesamelevelofthedistributionbox,thepowerandlightingcircuitsareseparated,andthelightingcircuitshouldbeconnectedtotheuppersideofthepowerswitch.(2)Theswitchboxisdistributedbythedistributionbox,andamachine,aswitch,andaleakageprotectorareinstalledintheswitchbox.Itisstrictlyprohibitedtouseoneswitchformultiplepurposes.3、分配電箱和開關(guān)箱之間的距離不得超過30米，開關(guān)箱和其控制的用電設(shè)備之間的水平距離不得超過3米。4、配電箱和開關(guān)箱應(yīng)該安裝在干燥通風和常溫的場所，周圍應(yīng)該有足夠的空間供兩個人同時工作，周圍不應(yīng)該堆放任何妨礙操作和維修的物品。5、配電箱和開關(guān)箱應(yīng)該安裝牢固，并且配電箱應(yīng)該安裝在堅固的支架上。固定式配電箱的下皮與地面垂直距離為1.4米，移動式配電箱的下皮距地面為1.2米。配電箱的外殼應(yīng)該用1.5毫米的鐵板制作，并且配電箱內(nèi)的工作零線應(yīng)該通過接線端子板連接，并且與保護零線端子板分設(shè)，配電箱的外殼也應(yīng)該作為保護接零。3、室內(nèi)配線1、室內(nèi)配線必須使用絕緣導(dǎo)線，并采用穿管敷設(shè)，距離地面的高度不得低于2.5米。2、室內(nèi)配線所使用的導(dǎo)線截面不得小于2.5平方毫米，銅線截面不得小于1.5平方毫米。3、室內(nèi)燈具不得低于2.4米，如果低于2.4米，則必須使用安全電壓。4、室內(nèi)各處接頭必須用分線盒保護好。5、場區(qū)照明采用白熾燈和碘鎢燈，照明燈距離地面3.0米，開關(guān)采用防水拉線開關(guān)。碘鎢燈的金屬外殼應(yīng)該作為保護接零。4、室外配電箱1、配電箱周圍應(yīng)該有足夠的空間供兩個人同時工作，不得堆放任何妨礙操作和維修的物品，不得有灌木和雜草等。2、配電箱內(nèi)的工作零線應(yīng)該能夠通過接線端子板連接，并且應(yīng)該與保護零線端子板分設(shè)。3、配電箱內(nèi)的連接線應(yīng)該采用絕緣導(dǎo)線，接頭不得松動，不得有外露帶電部分。配電箱的下底與地面的垂直距離為1.4米，移動式配電箱的下底與地面的垂直距離為0.8米。6、安全用電技術(shù)措施1、現(xiàn)場施工用電必須采用三相五線制，做好重復(fù)接地，并且設(shè)備應(yīng)該作好保護接零。2、線路禁止使用老化、絕緣性差的電線，嚴禁亂拉亂扯，線路架設(shè)要牢固，確保安全。3、配電箱必須做好防潮、防雨，并且作好接零保護。4、電動施工機械和手持電動機械的負荷線應(yīng)該選用無接頭的多股銅芯橡皮護套軟電纜