So long as there is a direct neutral connection between the two
systems, the system is not separately derived.
At 04:15 PM 3/11/2011, you wrote:
What's the best answer when someone asks if PV Systems are considered
separately derived systems?
It still seems to be up to whoever is doing the considering (AHJ), and I
don't like that answer.
I believe the answer is yes they are. And 690.47 tells us how to ground
them.
"(C) Systems with Alternating-Current and Direct-Current Grounding
Requirements. Photovoltaic systems having dc circuits and ac circuits with
no direct connection between the dc grounded conductor and ac grounded
conductor shall have a dc grounding system. The dc grounding system shall be
bonded to the ac grounding system by one of the methods in (1), (2), or
(3)."
Any help is appreciated
~Ryan
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Drake Chamberlin
Athens Electric
OH License 44810
CO license 3773
NABCEP Certified PV
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