Portable Generator Grounding

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tom baker

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System grounding is used to stabilize the voltage to ground and reduce overvoltage from contact with a higher voltage line or lightning.
Portable generators meeting 250.34 (A) and (B) don't require connection to a grounding electrode.
Other generators, if a SDS, require a connection to a grounding electrode system.
Why does the code exempt portable generators? (Sorry, this is one of my instructor questions)
 
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