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The Technician's EMI Handbook by Joseph Carr

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Chapter 7

AC Power-Line and Electrical Device EMI

Power lines are supposed to be clean and trim … right? Wrong, not by a long shot! Power lines are as “dirty” as you please … perhaps dirtier. A number of different conducted sources interfere with equipment through the power lines. There are brownouts (when voltage sags to 95 volts in the United States and Canada) and surges (when the voltage increases to 135 volts). Lightning causes its share of havoc, as does ordinary switching transients. In a medical center, we once flunked the entire freshman class of medical students on their physiology exam. Also failed were all of the basic sciences (i.e., Ph.D.) students and allied health students (e.g., nurse anesthesia, nurse practitioner, physician’s ...

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