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Leakage current commonly flows in the insulation surrounding conductors and the filters protecting electronic equipment.  On circuits protected by Ground Fault Current Interrupters, leakage current can cause intermittent tripping and in extreme cases can cause a rise in voltage on accessible conductive parts.  

To avoid damaging electrical equipment and avoid injury the use of specialized Harmonic and Leakage Electrical Testers are used to quantify the leakage current and then identify the source.  

Harmonic frequencies in the power grid are a frequent cause of power quality problems.  Power system harmonics are created by non-linear devices connected to the power system. High levels of power system harmonics can create voltage distortion and power quality problems.

Harmonics in power systems result in increased heating in the equipment and conductors, misfiring in variable speed drives, and torque pulsations in motors.