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I also have the catalog, and recall now why additional grounding was suggested. I think it is recommended to divert as much of a possible lightning strike around the concrete footing as possible, thereby lessening the possibility of cracked concrete around the anchor. My anchors are made of 12 foot sections 5 inch pipe with 3/16 inch wall. Each was centered in a 4 x 3 X 4 foot hole, and driven 3 more feet into the ground so that 5 feet is above ground. The holes were filled with concrete. There should be enough metal mass to carry the bulk of a strike directly to ground without heating the surrounding concrete. You can ground the guys using some tinned copper grounding braid often seen for sale at hamfests. I used some to ground all three tower legs. See the photos at http://www.dutson.net/Ham/P6160001.jpg http://www.dutson.net/Ham/P6160004.jpg There has been no rust since these were installed in 1994. The tower has received three observed direct strikes so far, with no damage at all. Keith WD5DXL -----Original Message----- From: Steve Rutledge [mailto:strutledge@oii.net] Sent: Saturday, October 11, 2003 12:39 PM To: keith@dutson.net; force12talk@qth.com Subject: Re: [Force 12 Talk] OT: Guy/Grounding Question Well, they aren't running to an insulated anchor point. I was just following the instructions in the Rohn book and the advice of my fellow hams. Clue me in since I obviously have my head up my ass according to the tone of your note. Keith Dutson wrote: > > I cannot imagine guys running to an insulated anchor point. How did you > manage to do that? > > Keith > > -----Original Message----- > From: Steve Rutledge [mailto:strutledge@oii.net] > Sent: Friday, October 10, 2003 12:29 PM > To: Force12Talk > Subject: [Force 12 Talk] OT: Guy/Grounding Question > > Thanks for your indulgence. I am in the process of trying to ground my > 3/16" steel guys. I have a rod in the ground and #4 copper wire. I > have a temporary lash-up using a cable clamp. However, I am warned that > the copper wire will cause the galvanized guy to rust, i.e., dissimilar > metals. > > Where do I find the clamps that keep the copper and the steel > apart?????? I have seen them in the Rohn catalog but I can't locate > any?????? > > Thanks for your patience. > > Steve, N4JQQ > > -------------------------------------------- > Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. > Force12 Web Site: http://www.force12inc.com > > To Submit Message to the List: Force12Talk@qth.com > To unsubscribe and view the Message Archive: see http://qth.com/force12/list > For problems with the list: contact force12@qth.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact force12@qth.com |
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