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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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, [email protected] 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:[email protected]] >> Sent: Wednesday, May 22, 2019 7:51 AM >> To: [email protected] >> Subject: Fw: [AFMUG] Active Lightning Suppressor - Snake Oil, or Science? >> >> I think snake oil. You? >> >> >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> ------------------------------ >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > > > -- > Lewis Bergman > 325-439-0533 Cell > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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