[RE-wrenches] FW: 690.47D (revisited)

[Mark Frye]

Rick, 

I don't see that applying to Kelly's question.

He said that the AHJ is not requiring the separate array grounding in his
case.  The discussion has to do with the number and sizing of conductors run
in various parts of the system in order to accomplish various "grounding"
requirements.

Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City,  CA 95959
(530) 401-8024
www.berkeleysolar.com 

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Richard L
Ratico
Sent: Thursday, June 04, 2009 6:29 PM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] FW: 690.47D (revisited)

Kelly,

If I understand your situation, the AHJ is allowing you to use the existing
grounding electrode/s as the (new for 2008) required array electrode, rather
than adding an additional electrode closer to the array. 

He does want an additional GROUNDING ELECTRODE CONDUCTOR, sized
appropriately, and, of course, run separately from the array circuit
conductors, directly from the array to the existing electrode.

If this is the case, it makes sense. You dont want to depend on your
EQUIPMENT GROUNDING CONDUCTOR, run with your circuit conductors, to carry
energy from a lightning strike, for instance. Take that energy (renewable
but undesired) to EARTH / GROUND as directly as possible.
Hope this helps.

Dick
Solarwind Electric
Bradford, VT