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Cable Size & Voltage Drop Calculationjignesh.parmar www.electricalnotes.wordpress.com jiguparmar@yahoo.com1
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:Input Data Sheet::Calculation::Results:FALSE
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Electrical Load6.25KwTotal Electrical Load6.25KW(1) No of Parallel Run of Cable:O.K1
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Motor Load0.00KwTotal Electrical Load in KVA6.25KVA(2) Cable Short Circuit Capacity:Not Applicable10.86
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Total Load6.25KwTotal Full Load Curent27.17Amp(3) Cable Voltage Drop:High0
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Type of Supply SystemSingle PhaseElectrical Load Starting Current27.17Amp(4) Selection of Cable Type:Not Proper0
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System Voltage V(L-N)230.00VoltElectrical Motor Starting Current0.00Amp(5) Motor Starting Voltage DropHigh0
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System Voltage V(L-N)230VoltTotal Starting Current27.17Amp1
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Demand Factor1.00Starting CosØ 0.75:Required Action for Proper Cable Selection:
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Power Factor1.00Starting SinØ 0.66
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Short circuit Current(If You Know)K.AmpRuning CosØ1.00
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Allowable voltage drop at Running5%Runing SinØ0.00=>Select Higher Size of Cable to reduce Voltage Drop
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Allowable voltage drop at Starting10%Cable Derating Factor:
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Motor Lock Rotor Current (If You Know):AmpCable Installation MediaGround=>Select Other Type of Motor Starter
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Motor Lock Rotor Current:2.00
X Full Load Current
Ground Temp. Correction Factor (K1)0.93=>Increase No's of Run of Cable to reduce Voltage Drop
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Motor Starting Power Factor:0.75Group Factor for Ground (K4)1.00
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Cable Detail:Cable Laying Depth Factor (K3)0.96Cable Selection is Not ProperFALSE
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Type of Cable:LT XLPE (Up to 1.1 KV)Soil Correction Factor for Air (K2)1.05
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Cable Conductor:CUTotal Derating Factor0.94
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Size of Cable:4cX 6 Cable Calculation
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No of Parallel Run of Cable1No'sConductor Resistance. 2.19Ohm / km
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Cable Length (Distance)200MeterConductor Reactance0.1Mho/km Motor Starter is not Proper2
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Cable Laying Method:Cable Current Capacity 55 Amp
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Cable Installation MediaGround2Derating Current52Amp
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Ground Temperature (K2)25°CMin.Required No of Runs of Cable1.00Nos
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Type
Cable Laying ArrangementSingle Tire HorizontalVoltage Drop Calculation:
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Distance Between each Cable0.25 mtReceving end Voltage206Volt
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No's of Cable in Trench1Allowable voltage drop at Running11.5Volt
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1Allowable voltage drop at Starting23Volt
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Cable Laying on The Depth of1.5MeterS.C Capacity of Selected Cable 0.858 K.Amp
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Soil Thermal ResistiivtyNot KnownKm/WattVoltage Drop at Starting10.3%
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Nature of Soil (k3)Damp SoilVoltage Drop at Running10.3%
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N.B: Enter Your Data in White Background Cell
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Formula For % Voltage Drop:=
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(1.732 X (Full Load Current)X(RCosØ+j SinØ)XLengthX100) / Line VoltageXNo of RunX1000
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