Kirk:
A DC grounding electrode conductor (GEC) is not required for inverters
that do NOT have a ground reference for the PV+ and PV- conductor(s)
from the PV array.
A GEC is not required if the string inverter is one of the new TL
(transformerless) types. Also, this applies to micro-inverters such as
the new Enphase M250 and later versions of the M215.
Where this applies, only a properly sized equipment grounding conductor
(EGC) is required.
The EGC is sized according to [NEC 690.45] and can be a minimum of
#14AWG when not exposed to damage, or #6AWG when exposed to potential
damage.
Regards,
Gary Willett PE
Icarus Engineering LLC
On 10/28/14, 12:53 PM, Kirk wrote:
Hi,
I'm on a jobsite without my code book. Could someone tell me where in the code
ungrounded systems do not require the inverter GEC? Basically my onsite
electrician doesn't believe me. Thanks.
Kirk Herander
VSE
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