Grounding on rock [RE-wrenches]

[Drake Chamberlin]

		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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