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Keith, The whole grounding issue has been very contentious, confounding, and confusing. The introduction of the changes with the 2008 NEC seems to have complicated things further. Also, just a general comment; in general (there will be exceptions for larger systems, depending on electrical configuration), this code section applies equally to all PV inverters. There should be no difference with an Enphase installation and a traditional string installation. What version of code are you referencing? 2005 and 2008 differ slightly. I'd like to get a consensus on all of these grounding issues. It's too late for the 2011 code, but maybe we can clear this up with the 2014 code. BTW, the explanatory note after paragraph 690.47(C)(8) in the 2008 handbook offers some clarification. I'm anxious to get John W. and Bill B.'s opinion on this. See Ya! Marv Enphase Energy 707 763-4784 x7016 Keith Cronin wrote:
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