临时用电方案

临时用电方案

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、分配电箱和开关箱之间的距离不得超过30米，开关箱和其控制的用电设备之间的水平距离不得超过3米。4、配电箱和开关箱应该安装在干燥通风和常温的场所，周围应该有足够的空间供两个人同时工作，周围不应该堆放任何妨碍操作和维修的物品。5、配电箱和开关箱应该安装牢固，并且配电箱应该安装在坚固的支架上。固定式配电箱的下皮与地面垂直距离为1.4米，移动式配电箱的下皮距地面为1.2米。配电箱的外壳应该用1.5毫米的铁板制作，并且配电箱内的工作零线应该通过接线端子板连接，并且与保护零线端子板分设，配电箱的外壳也应该作为保护接零。3、室内配线1、室内配线必须使用绝缘导线，并采用穿管敷设，距离地面的高度不得低于2.5米。2、室内配线所使用的导线截面不得小于2.5平方毫米，铜线截面不得小于1.5平方毫米。3、室内灯具不得低于2.4米，如果低于2.4米，则必须使用安全电压。4、室内各处接头必须用分线盒保护好。5、场区照明采用白炽灯和碘钨灯，照明灯距离地面3.0米，开关采用防水拉线开关。碘钨灯的金属外壳应该作为保护接零。4、室外配电箱1、配电箱周围应该有足够的空间供两个人同时工作，不得堆放任何妨碍操作和维修的物品，不得有灌木和杂草等。2、配电箱内的工作零线应该能够通过接线端子板连接，并且应该与保护零线端子板分设。3、配电箱内的连接线应该采用绝缘导线，接头不得松动，不得有外露带电部分。配电箱的下底与地面的垂直距离为1.4米，移动式配电箱的下底与地面的垂直距离为0.8米。6、安全用电技术措施1、现场施工用电必须采用三相五线制，做好重复接地，并且设备应该作好保护接零。2、线路禁止使用老化、绝缘性差的电线，严禁乱拉乱扯，线路架设要牢固，确保安全。3、配电箱必须做好防潮、防雨，并且作好接零保护。4、电动施工机械和手持电动机械的负荷线应该选用无接头的多股铜芯橡皮护套软电缆