residential back up gen.

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It is not a "seperately dirived system" if the the grounded conductor of the gernerator is electrically connected to the grounded conductor of the sevice or normal power (NEC 250.6) howver; if the grounded conductor in not electrically connected, like through a 4P ATS, then yes it is a "seperately derived system" (NEC 250.7).
 
SDS or not a privately owned generator is never a 'service' when applying the NEC.

A service is only provided by a utility.
 
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