Where is Ground Clamps [RE-wrenches]

[Bill Brooks]

Dean and Jay,

PVUSA has a continuous substation ground grid (not done in standard PV
systems), and has continuous ground wires connected to each module and all
metal structures. The grounds are still in good shape, but we always caution
any visitors to the site to never touch the module frames without testing
and verifying that the frames are safe (still grounded--no voltage
difference to ground). That is good practice for any PV system.

Bill.

-----Original Message-----
From: Dean T. Newberry [mailto:deant at dcn.org]
Sent: Monday, April 21, 2003 10:56 PM
To: RE-wrenches at topica.com
Subject: Re: Where is Ground Clamps [RE-wrenches]


Hi Jay,

I'll try and talk to the supervisor at PVUSA and see what the module
grounding looks like out there and make a report to the list.

Jay Peltz, Peltz Power wrote:

>HI Jeff,
>
>Thanks for the input.
>
>I wonder what in 10 yrs the inpedence will be like with any type of screwed
>in fitting?  These grounds need to last for 25+ years.
>
>I'm going to spend the summer, checking every old metal rack I can find and
>see what the resistance is between the panels and frames.  I've got lots of
>systems that are 15+ yrs old on metal frames.
>
>I'll keep you up to date.
>
>jay
>
>

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