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

[Mike Bernhard]

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Drake,
Yes.  Regardless of what you call the GEC (DC or AC sep.derived sys).  A GEC 
from the inverter is currently required and it MUST be connected to the 
building grounding electrode system.
Mike Bernhard
----- Original Message ----- 
From: "Drake Chamberlin" <Drake.Chamberlin at redwoodalliance.org>
To: <RE-wrenches at topica.com>
Sent: Wednesday, June 20, 2007 2:41 PM
Subject: RE: Inverter Output Circuit and DC GEC requirements [RE-wrenches]


>
> 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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