Voltage Drop Calculation Program Last update: June 2012
      Voltage drop is the reduction in voltage due to the flow of current through the impedance in conducting line. Excessive voltage drop will result in unsatisfactory operation of electrical     equipment, and represents energy wasted in the wiring system.
 
 
Minimum Conducter Size
 
System Parameter & Cable Installation
  System Conductor Installation  
 
          Voltage 220 V   380 V    Other V
          Frequency 50 Hz   60 Hz    Other
          Conductors Rating 70°C    90°C     Other °C
          Power factor
 
                          Length of Cable M.
                          Load Current A
                          Maximum Voltage drop       %
Minimum Conductor Size         MM2

     

   
 
     Note: NEC RECOMMENDATIONS
  1. Branch Circuits – maximum voltage drop of 3%.
(The maximum total voltage drop for a combination of both branch circuit and feeder should not exceed 5%)
2. Feeders – maximum voltage drop of 3%.
(The maximum total voltage drop for a combination of both branch circuit and feeder should not exceed 5%)
3. Services - maximum voltage drop of 5%.
 
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