Wire Voltage Drop Calculator to AS/NZS 3008

Welcome to our cable voltage drop calculator! This page operates as both an AC and DC voltage drop calculator and will enable you to calculate the voltage drop across a length of wire using a specified input voltage, rated load current and distance.
Voltage drop due to wires is an important parameter in the design of electrical circuits, especially in high-voltage systems. Controlling and anticipating this voltage drop is essential for building safe and efficient electrical systems. 
CalculationInputs﻿﻿L 
:5m​
﻿
﻿﻿I
:2ampere​
﻿
﻿﻿R, Ω/km
:9​
﻿
﻿﻿X, Ω/km
:9​
﻿
Output﻿﻿Z, Ω/km
:12.7279221​
﻿
﻿﻿V_DC 
:0.18volts​
﻿
﻿﻿V_AC_1P, V 
:0.18volts​
﻿
﻿﻿V_AC_3P, V
:0.1558845volts​
﻿
ExplanationVoltage drop is defined as the amount of voltage reduction in an electrical circuit due to resistance. This resistance can be in the form of electrical components such as resistors, inductors or capacitors, but it can also occur due to the electricity carrying wire's internal resistance. 
The voltage drop due to the conductor wire's internal resistance can be calculated as follows: 
Read more on calculating impedance using resistance and reactanc
﻿
DC circuits
﻿
ΔVDC=2LIRc1000\Delta V_ {DC} = \frac{  {2LIR_{c}} }{1000}ΔVDC​=10002LIRc​​
single-phase AC circuits
﻿
ΔV1ϕ−AC=2LIZc1000\Delta V_ {1\phi -AC} = \frac {2LIZ_c}{{1000}}ΔV1ϕ−AC​=10002LIZc​​
For three-phase AC circuits
﻿
ΔV3ϕ−AC=3LIZc1000\Delta V_ {3\phi -AC} = \frac{ \sqrt3LIZ_c} {1000}ΔV3ϕ−AC​=10003​LIZc​​
﻿
Where: 
﻿
L=Length of wire (mm)I=Current (A)Rc=Wire resistance (Ω/km)Zc=Wire impedance (Ω/km)L = Length \: of \: wire \: (mm) \\I = Current \: (A) \\ R_{c} = Wire \: resistance \: (Ω/km) \\ Z_{c}  = Wire \: impedance \: (Ω/km)L=Lengthofwire(mm)I=Current(A)Rc​=Wireresistance(Ω/km)Zc​=Wireimpedance(Ω/km)
Related ResourcesCheck out our full library of CalcTree templates here! 
3-Phase Power
Arc Flash 
Electricity Bill 
﻿