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Origin of 4 grounds per mile

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magoo2

magoo2

Electrical
Joined
May 17, 2006
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857
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This is a U.S. practice related question. The National Electrical Safety Code (NESC) has a requirement of 4 grounds per mile for 4-wire multi-grounded neutral systems. Does anyone know where the 4 grounds per mile came from?
 
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