I guess that is what they are thinking From: Af [mailto:[email protected]] On Behalf Of Steve Jones Sent: Monday, July 24, 2017 3:34 PM To: [email protected] Subject: Re: [AFMUG] Tower Top Grounding discussion
So theyre protecting themselves from a strike to the tower coming right into their gear on its way to ground with an airgap? The induced voltage that does get on the transmission lines will just shunt to ground via their isolated ground? On Mon, Jul 24, 2017 at 1:55 PM, Paul McCall <[email protected]<mailto:[email protected]>> wrote: In this case, I don’t own either tower, so doubtful I could convince them to put a 8’ rod at the top. Do you Cambium antennas (ePMP 5 ghz / 2.4 ghz) require a ground plane? Paul From: Af [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Lewis Bergman Sent: Monday, July 24, 2017 1:47 PM To: [email protected]<mailto:[email protected]> Subject: Re: [AFMUG] Tower Top Grounding discussion On 1. it will be really difficult to completely isolate a piece of equipment unless it is designed to float but good luck. If you are truly going to isolate everything from ground then you won't need to worry about #2 as all will float. You should check that the antenna you are using don't require a ground plane. On 2. I Cadweld a 2/0 jacketed to an 8' rod at the top of the tower, not isolated. I then bond (15 ton Hydraulic Crimp) it to a bus bar 5' below the top for equipment grounds. Anywhere else there is a cluster of equipment I also put a bus bar. I then take that 2/0 to the bottom to the last bus bar and then into the ground ring. 1. Wondering what materials people are using to isolate their mounts? What is sufficient? Would the rubber from a thick radiator hose be enough to keep the lightning from coming through? Double thicknesses? One consultant recommended starboard, but I am not sure how I will craft that into a work piece that would mold around a tower leg and be able to grip it. 1. What size wire should be going down the tower to bond to my tower / electrical ground? I am assuming it should be insulated but is normal THHN jacketing enough to have it truly isolate from something jumping over or does it have be in conduit. Paul Paul McCall, President PDMNet, Inc. / Florida Broadband, Inc. 658 Old Dixie Highway Vero Beach, FL 32962 772-564-6800<tel:(772)%20564-6800> [email protected]<mailto:[email protected]> www.pdmnet.com<http://www.pdmnet.com> www.floridabroadband.com<http://www.floridabroadband.com>
