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—and Vacuum Cleaners Current Transformers  are they used?
—and Vacuum Cleaners Current Transformers are they used?

Application Note: AN-114 ITC117P Integrated Telecom Circuit
Application Note: AN-114 ITC117P Integrated Telecom Circuit

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... lower amplitude than the differentialmode signal, and the common-mode component is DC or low frequency, such as 50 or 60 Hz power line. It effectively eliminates ground loop voltages from the measurement when measuring signals of moderate amplitude. ...
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Ground loop (electricity)

In an electrical system, a ground loop is an equipment and wiring configuration which results in excessive unwanted current in a conductor connecting two points that are supposed to be at the same electric potential, often ground, but are actually at different potentials.Ground loops are a major cause of noise, hum, and interference in audio, video, and computer systems. They do not in themselves create an electric shock hazard, the inappropriate connections merely create a not necessarily very good instance of Electrical_bonding, which is explicitly required by safety regulations in certain circumstances. In any case the voltage difference between the ground terminals of each item of equipment is small. A severe risk of electric shock occurs when equipment grounds are improperly removed in an attempt to cure the problems thought to be caused by ground loops.
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