[RE-wrenches] bare tinned solid copper

[Phil Schneider]

Engineer wants to see #6 above grade (fine), but #2 direct buried between
ground rods (seems excessive).

Phil Schneider
Creative Energies



On Wed, May 5, 2010 at 10:44 PM, August Goers <august at luminalt.com> wrote:

>  Phil,
>
> The inspector wants to see #2 tinned copper for equipment ground in exposed
> areas? Or is he referring to the grounding electrode conductor? This kind of
> stuff gets mixed up all the time in my neck of the woods...
>
> -August
>
>
>
>  August Goers
>
>
> Luminalt Energy Corporation
> O: 415.564.7652
> M: 415.559.1525
> F: 650.244.9167
> www.luminalt.com
>
>  ------------------------------
> *From:* re-wrenches-bounces at lists.re-wrenches.org [
> re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Phil Schneider [
> phil at creativeenergies.biz]
>
> *Sent:* Wednesday, May 05, 2010 8:24 AM
> *To:* RE-wrenches
> *Subject:* [RE-wrenches] bare tinned solid copper
>
>  Wrenches,
>
>  We are working through submittal steps for a 75 kW ground mounted array.
>  The array is split into 8 subarrays.  There is a combiner or junction box
> at each subarray, with a ground rod spec'd at each subarray, underneath the
> "box station", with a bare stranded #6 from an equipment grounding bus to
> the rod, and equipment grounding conductors through conduit between a ground
> bus in each box.  15A fuses in combiners, and 100A fuses at inverter.
>
>  The engineer we're working with to stamp the plans wants to see bare,
> tinned, solid copper anywhere this equipment ground is in the elements, and
> wants to see #2 (!) bare, tinned, solid copper cadwelded and direct-buried
> between all 8 rods and back to the existing AC grounding electrode system.
>  He says this is the standard (from telecom, I'm afraid) to ensure that all
> the rods are at the same potential.  No Code reference, and I don't see
> anything in article 250 along these lines.  Hard to convince him that #6,
> untinned, across the board is adequate.
>
>  In the end, we'll probably go ahead and do it because it is relatively
> low cost and we want a good relationship here, but I'm wondering if anybody
> else out there is using bare tinned copper in this type of application, and
> I'd like more info on this to make a better argument next time.
>
>  Phil
>
>  Phil Schneider
> Creative Energies
>
>
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