Excessive Neutral Current - Internal Causes and Solutions

High neutral currents in buildings usually result from two situations. The first, and most common, is one where there are simply heavily unbalanced loads. This situation is usually easy to explain and remedy.

The second situation involves current harmonic distortion. This is where the terms "unexplained" and "excessive" come into play, since harmonic distortion changes the rules we are used to playing by.

In today's environment, it is becoming increasingly likely that high neutral currents result from some combination of the two.