Enter the phase A current (amps), the phase B current (amps), and the phase C current (amps) into the calculator to determine the Neutral Current. 

Neutral Current Formula

The following formula is used to calculate the Neutral Current.

In = (A^2+B^2+C^2-A*B-A*C-B*C)
  • Where In is the Neutral Current (amps)
  • A is the phase A current (amps) 
  • B is the phase B current (amps) 
  • C` is the phase C current (amps) 

How to Calculate Neutral Current?

The following example problems outline how to calculate Neutral Current.

Example Problem #1

  1. First, determine the phase A current (amps). In this example, the phase A current (amps) is determined to be 10 .
  2. Next, determine the phase B current (amps). For this problem, the phase B current (amps) is measured to be 23 .
  3. Next, determine the phase C current (amps). In this case, the phase C current (amps) is found to be 3.
  4. Finally, calculate the Neutral Current using the formula above: 

In = (A^2+B^2-+C^2-A*B-A*C-B*C)

Inserting the values from above and solving yields: 

In = (10^2+23^2+3^2-10*23-10*3-23*3) = 309 (amps)

Example Problem #2

Using the same method as above, determine the variables required by the formula. For this example problem, these are:

phase A current (amps) = 5

phase B current (amps) = 41

phase C current (amps) = 2

Enter these given values into the calculator or above yields: 

In = (5^2+51^2+2^2-5*41-5*2-41*2) = 2333 (amps)