The majority of power quality problems are due to improper or ineffective electrical distribution and grounding within the customer’s site.Typical grounding and distribution problems result from the following:
-Improper wiring due to a misunderstanding of the differentiation between earth ground and safety ground.
-High impedance in the earth ground system.
-Excessive levels of current in the grounding systems, due to wiring errors, leakage current, ground loops and other problems.
It must be realized that although mitigating equipment when properly applied will resolve voltage quality problems, they will do nothing to resolve problems arising from the site distribution and grounding system.