Its best if site is powered down but I ve measured either way and havent
really seen much difference
On 5/24/19 9:10 AM, Lewis Bergman wrote:
No, it isn't that simple. If you clamp it on a ground rod below the
ground ring attachment it gives you the resistance to ground of that
particular rod.
You clamp it on the incoming nuetral line from the power company to
measure the complete site resistance.
On Fri, May 24, 2019 at 8:31 AM Josh Luthman
<j...@imaginenetworksllc.com <mailto:j...@imaginenetworksllc.com>> wrote:
You just clamp that around a ground rod and it gives you ohms,
resistance to earth? Is it really that simple?
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Thu, May 23, 2019 at 10:01 AM Lewis Bergman
<lewis.berg...@gmail.com <mailto:lewis.berg...@gmail.com>> wrote:
R56 is a standard developed by Motorola for critical
communications sites. Chuck can likely point you to a similiar
standard developed by NEC or some Telco consortium that
defines grounding standards for telco facilities. Half the
standards are usually about human safety and the other half
are about equipment safety.
The bottom line is, if you can get your site to less than 5
Ohms earth resistance to ground you are about as good as you
can hope for. Lower is better but below 5 Ohms the return on
investment diminshes rapidly. I think the lowest I have seen
is 0.5 Ohms on a brand new site. We put a lot of grounding,
enhancemnet material, etc. But it is like good insurance and
it does work. We had an old tower that had poor grounding. We
retrofitted it with a modern system and lowered the number of
strikes from an average of 15 or so a year to 1 in 3 years.
You can use a device like this: Clamp on ground tester
<http://www.testequipmentdepot.com/AEMC/ground-resistance-testers/clamp-on/clamp-on-ground-resistance-tester-6416.htm?ref=gbase&gclid=CjwKCAjwiZnnBRBQEiwAcWKfYi9_sp7BYOU7SUh8oCsy0VRd-Sm9Kx05ShpV-11tT_xAboQ4UAY5GxoClmgQAvD_BwE>
to
easily measure the resistance of a whole site. You do have to
know where and how to use it. To accurately measure parts of a
grounding system accurately you have to know how it is
designed. Most of the time a zer resistance reading means you
are measuring a loop of copper. I laugh every time I go to a
cell site and they have a ground test pound that is basically
a loop on top of a ground rod. Yaeh, no wonder they passed the
test.
On Wed, May 22, 2019 at 9:32 PM Chuck McCown <ch...@wbmfg.com
<mailto:ch...@wbmfg.com>> wrote:
Google “Air Terminal Lightning” and then click on images.
Or just check out some of these:
https://www.erico.com/category.asp?category=R2438
https://www.jjengineersindia.com/lightning-protection-system.html
https://www.jmvearthing.com/early-streamer-emmission.html
This one has some snake oil type of hype too:
http://www.lps-pacifica.com/Ellips.html
Ever read “Something Wicked This Way Comes”?
*From:* Matt Hoppes
*Sent:* Wednesday, May 22, 2019 7:16 PM
*To:* AnimalFarm Microwave Users Group
*Subject:* Re: [AFMUG] Fw: Active Lightning Suppressor -
Snake Oil, or Science?
So if this is all snake oil - why do some commercial
towers have some variation of this at the top?
That’s what I’m trying to understand.
An engineer for clear channel told me he’s seen a corona
develop around one of his towers that had a similar item
on it when storms are coming through the area.
On May 22, 2019, at 2:56 PM, Bill Prince
<part15...@gmail.com> wrote:
My SO is unusually wary of lightning and lightning
strikes. If there is the slightest hint of lightning or
thunder, she reverts to the air gap method of lightning
protection. If there are no wires connected to a piece of
electronics, then it is most safe.
Doesn't help a lot in our business, but that is what she
does.
bp
<part15sbs{at}gmail{dot}com>
On 5/22/2019 11:51 AM, Matt Hoppes wrote:
Are you suggesting that if you power off the equipment
during a lightning strike it won’t take damage? Why
would that be?
On May 22, 2019, at 2:42 PM, dave <dmilho...@wletc.com>
wrote:
I have been working with this AS3935 franklin lightning
sensor for about 6 months now and learned so much more
about lighting and its projected energies and possible
frequencies its amazing how this little sensor can
detect distance and the amount of energy BEFORE it strikes.
So,armed with this ability I am solely working on a
design along with IR sensing to help mitigate damage to
a site during a storm.
I am still working on the timing to be able to shut
down power to the gear outside for a time period at
which if lightning is still present remain off till
storm passes.
End of Run sites are the worst but knock on wood after
a year or 2 of planning and cleaning up the existing
grounds everything seems well.
<Vcard.jpg>
On 5/22/19 9:23 AM, ch...@wbmfg.com wrote:
This is from the executive director of the lightning
protection institute.
-----Original Message----- From: Bud VanSickle
Sent: Wednesday, May 22, 2019 7:41 AM
To: 'Chuck McCown'
Subject: RE: [AFMUG] Active Lightning Suppressor -
Snake Oil, or Science?
Snake oil for sure. You can't stop lightning strikes
because of the volume
of energy and short time period. If you put one of
these devices on a fully
grounded metallic tower, it would most likely take a
strike to ground. Of
course, if you ground your metallic tower properly, it
is like a giant
lightning rod, so you are out the money for this
"topper". By the way, on
tall towers, lightning doesn't necessarily strike the
top anyway - it is
almost never straight vertical and may be at a 45
degree angle to the side.
But let me ask you this - if all the pine needles in a
forest can release
ions (which they can and do) or all the blades of
grass on the prairie, why
does lightning still strike there?
Bud VanSickle
-----Original Message-----
From: Chuck McCown [mailto:ch...@wbmfg.com]
Sent: Wednesday, May 22, 2019 7:51 AM
To: b...@lightning.org
Subject: Fw: [AFMUG] Active Lightning Suppressor -
Snake Oil, or Science?
I think snake oil. You?
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