grounding plate vs. rod? [RE-wrenches]

Todd Cory, Mt. Shasta Energy Services toddcory at finestplanet.com
Wed Dec 18 08:32:22 PST 2002


When I was doing broadcast engineering a few years back, we used 4" wide straps
for grounding... connecting gear racks as well as burying these in the ground to
improve mountain top ground conductivity. These were usually bonded to, and used
to connect traditional ground rods, often placed in a circle around the
building.

This technique proved highly successful at protecting sites from lightning
damage, although I believe the main reason for using 4" wide copper was as it
was much more effective at shunting high frequency RF to ground than traditional
#4 copper.

Todd



Scott Russell wrote:

> Hello, all.
>
> I'm installing PV in Nepal for a Kathmandu-based company. They typically use
> copper grounding plates (18"x18") here rather than the grounding rods I'm
> familiar with back in the good ol' USA. Our Nepali techs claim that the
> local soil composition necessitates taking extra steps to increase its
> conductivity. That is, using the larger surface area of a plate as opposed
> to a rod and burying it parallel to the surface, two or more meters deep
> sandwiched between two layers each of salt and coal. Does this sound
> reasonable/plausible? As you might imagine, driving a grounding rod is much
> more appealing to me than (hand) digging a 24-inch diameter hole, 7+ feet
> deep.
>
> Thanks in advance for you insights.
>
> Scott Russell
> Lotus Energy, Kathmandu

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