Inverter Output Circuit and DC GEC requirements [RE-wrenches]

[Drake Chamberlin]

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Hello Bill,

We recently had an inspector require us to run a GEC to a ground rod 
from a grid tie only system.  Usually, this has not been required in 
systems where we don't have batteries and the DC grounding point is 
internal to the inverter.   The conductor was only able to make an 
equipment ground, not a connection to the DC grounding.

Is it usually necessary to run a GEC to a rod with grid tie only inverter?

Thanks,

Drake

>If a code inspector requires you to derive a separate ground (690.47(C)(1)),
>ALWAYS tie that ground to the ac grounding electrode. The bummer to this
>method is that you must use the larger of the two GECs to run between the
>two grounding systems (you are creating a grounding electrode system). If
>you hold off and tie into the ac grounding electrode (690.47(C)(2)), the
>conductor only has to be sized according to the dc side, which is almost
>always smaller.


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