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CALCULATION OF VOLTAGE DROP AND CABLE SIZE FOR MOTOR / ELECT.LOADJignesh.Parmar www.electricalnotes.wordpress.com jiguparmar@yahoo.com
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INPUT DATA SHEETRESULTDATA IS PROPERFALSE
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Select Your LoadMotor (Only)Electrical LoadTotal Load40.00KwSelection of Cable is Proper21
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 Toal Electrical Load40KwDemand Factor (Assume)11
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DolConsumed Load40.00KwTRUE
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0.75Starting CosØ 0.75
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0.75Starting SinØ 0.66
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80Runing CosØ0.80
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Demand Factor1Runing SinØ0.60
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System Voltage V(L-L)440Volt3 PhLoad in KVA50.00KVA
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System Voltage V(L-N)254Volt1.732
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P.F0.80Full Load Current65.61Amp
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Enter Short circuit Current If You Know
K.Amp
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Cable Installation MediaGround22Cable Installation MediaGround
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Ground Temperature (K2)45°C
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No of Trench1
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No of Cable/Trench1Ground Temp. Correction Factor (K2)0.80
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Distance Between CableNillSoil Correction Factor for Air (K3)1.21
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No. of Runs of selected cable1Group Factor for Ground (K4)1.00
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Cable Laying on The Depth of1MeterCable Laying Depth Factor (K5)1.00
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Soil Thermal ResistiivtyNot KnownKm/WattTotal Derating Factor0.970.97
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Nature of Soil (k3)Very Wet SoilConductor Resistance. 1.11Ohm / km
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Distance 200MeterConductor Reactance0.080Mho/km
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Type of CableLT XLPE (Up to 1.1 KV)3cX 35 ALCable Current Capacity 116 Amp
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Allowable voltage drop 5%Derating Current112.29Amp
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10Min.No of Runs of Selected Cable0.580
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Voltage Drop4.83%
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Receving end Voltage418.73Volt
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Allowable voltage drop 22Volt
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N.B: Enter Your Data in White Background Cell
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Formula For % Voltage Drop:=S.C Capacity of Selected Cable 3.29 K.Amp3.29
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(1.732 X (Full Load Current)X(RCosØ+j SinØ)XLengthX100) / Line VoltageXNo of RunX1000
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