National Power Laboratory Power Quality Study results based on 600 site-months

The preliminary report of the National Power Laboratory (NPL) Power Quality Study is based on 600 site-months of data. Disturbance monitoring is done at the standard wall receptacle at each location. This yields a true picture of the disturbance exposure rate for typical 120 V AC loads. This exposure encompasses both utility and load-generated disturbances. A typical site will have 445 power disturbances outside of computer manufacturers' standards for power quality. Each of these disturbances has the potential to disrupt the operation of electronic equipment. Recommendations are made for the use of power conditioning and protective equipment to maintain power operation of critical loads.<>