[RE-wrenches] DC lightning arrestors

[R Ray Walters]

I just recently bought a clamp on ground impedance tester. I found one system that was less than an ohm, worst  one was almost 800 ohms. Only a few were below 25 ohms. 
You're absolutely right: good lightning protection starts with a good ground.
The impedance tester takes the guess work out of just how good (or bad) the grounding is.
My theory is that in a poorly grounded system with everything tied together, that the strike (or induced surge) just oscillates back and forth through the system dissipating itself through the components of the system.

R. Walters
ray at solarray.com
Solar Engineer




On Apr 17, 2010, at 9:18 AM, Darryl Thayer wrote:

> This last week I spoke with a cell phone tower installer.  He said, Nothing beats the ground! he said the most important thing is the tower grounding, The idea of 25 Ohms to Ground is way to high.  Ground rods are useless, and lightning arresters do no good without a good ground, in fact people who worry about the lightning arrestor putting power back into there system have something to worry about if the ground is not good. 
>  
> So that is what he said and was very adimit about it.
> Darryl  
> 
> --- On Fri, 4/16/10, Marco Mangelsdorf <marco at pvthawaii.com> wrote:
> 
> From: Marco Mangelsdorf <marco at pvthawaii.com>
> Subject: [RE-wrenches] DC lightning arrestors
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Date: Friday, April 16, 2010, 5:31 PM
> 
> Is the best one can do as far as high DC array voltage the Delta LA602?
> 
>  
> Didn’t they used to have a high voltage version of the LA302DC?
> 
>   
> Thanks,
> 
> marco
> 
>   
> <image001.jpg>
> 
> Marco Mangelsdorf, President
> 69 Railroad Avenue, A-7
> Hilo, Hawai'i 96720
> (808) 969-3281, 934-7462 facsimile
> www.provision-solar.com
> 
>   
>  
> -----Inline Attachment Follows-----
> 
> _______________________________________________
> List sponsored by Home Power magazine
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out participant bios:
> www.members.re-wrenches.org
> 
> 
> _______________________________________________
> List sponsored by Home Power magazine
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out participant bios:
> www.members.re-wrenches.org
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20100417/7647dfc8/attachment-0004.html>