Grounding on rock [RE-wrenches]

[Jason Lerner]

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Thanks very much Drake, I (and the inspector) missed that.

Jason
On Sep 30, 2006, at 6:41 AM, Drake Chamberlin wrote:

>
>
>
> 		Code requires a 30" depth of burial for plate electrodes.
>
> 250.53
> (H) Plate Electrode   Plate electrodes shall be installed not less  
> than 750 mm (30 in.) below the surface of the earth
>
> ----------------------------------------
>
> 				From: Jason Lerner <wapalco at gmail.com>
> Sent: Friday, September 29, 2006 6:57 AM
> To: RE-wrenches at topica.com
> Subject: Re: Grounding on rock [RE-wrenches]
>
> Hello Jim,
>
> What we do is weld up the grounding plates in the shop.  A 1/4" piece
> of steel 1'x1' with a rod welded to the top meets the NEC.  Then if
> it is rock like you are describing we bring in soil and mound it up,
> to get the plate 24" deep.  It sure beats a couple hours with the
> Jackhammer.
>
> Best Regards,
>
> Jason Lerner
> Waldron Power and Light Co.
> On Sep 28, 2006, at 2:47 PM, Jim Duncan wrote:
>
>>
>> Wrenches,
>> I won't be able to drive a ground rod due to the bedrock being less
>> than
>> a foot below the surface. A quick review of the NEC suggested ground
>> plates as one option. Calling local supply houses turned up no one
>> with
>> such a device. The internet showed a clever ground lattice of rivited
>> copper clad metal strips formed in a grid; available from India.
>> Another product was a 20 foot long flat roll of copper sheet with
>> a  #6
>> copper lead welded to one end and a powdered compound to mix with
>> water
>> and pour in the trench to improve conductance. I'd be afraid to ask
>> what
>> that costs with the price of copper.
>> A 20 foot #2 wire has to be at least 30 inches deep and, short of
>> hauling in a truckload of dirt, there isn't 30 inches of dirt
>> anywhere.
>> What sort of clever ideas have been used to solve this age old
>> dilemma?
>> As always, thanks
>>
>> Jim Duncan
>> North Texas Renewable Energy Inc
>> Fort Worth, Texas
>> ntrei at earthlink.net
>> 817.917.0527
>>
>>
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