Automated ground fault interrupt tester
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United States of America Patent
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Mar 12, 2019
Grant Date -
Mar 30, 2017
app pub date -
Sep 21, 2016
filing date -
Sep 28, 2015
priority date (Note) -
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Abstract
A system includes a hot wire and a neutral wire configured to establish a closed circuit between a power source and a load. The system further includes first and second transformers as well as a sensor. The first current transformer is coupled to the hot wire and is configured to introduce a first test current, with a first polarity, into the hot wire. The second current transformer is coupled to the neutral wire and configured to substantially simultaneously introduce a second test current into the neutral wire. The second test current has the same polarity as the first test current. The sensor is configured to sense an asymmetry between the first and second test currents and is further configured to cause interruption of the closed circuit upon sensing the asymmetry.
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