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ATV71: What does IT,TT,TN in grounding system mean?

Issue: 
What does IT,TT,TN in grounding system mean?

Product Line:
ATV71

Environment:
All

Cause:
Don't know what the acronym "IT" stands for in a grounding circuit for line filter application.

Resolution:
http://www.electrical-installation.org/enwiki/Characteristics_of_TT,_TN_and_IT_systems





 
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