VA Calculator

Choose an option:

Determine the minimum VA Rating required for your CT.

Determine the max length of your CT leads based on a VA Rating.

Enter the CT current output in amps (0.1, 1, 5, etc):

Do you want to use 100% of the rated current or 120% (per IEC) as the max current?

100% 120%

Do you want to enter the meter resistance as a burden (Ω) or as a VA rating? Ohms (Ω) VA Rating

What is the value of the meter resistance?

Select a gauge of wire:

Specify length requirement (in ft):

Specify CT VA Rating:

Understanding the VA Rating of CTs

You can use this calculator to do a few things:

Determine the max length of wire you can use with a meter (w/o losing accuracy).
Determine what VA rating you would need for a CT given a required distance.
Determine the effect of different gauge wire on the CT circuit.