Try their web site http://www.polyphaser.com/ I recalled a book they gave away on grounding, but I will say this from a Electrical Instructor... When in doubt ground the **** out of it ! The web site has some interesting info at Technical Docs. part some good reading there. the Engineering Notes I see that there are some interesting thoughts, worth the visit .
M. H. ----- Original Message ----- From: "Fred Seamans" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, January 16, 2005 7:28 AM Subject: Re: [Repeater-Builder] LDF5-50a > > If you want to read a short paper on Lighting Protection and learn; obtain > a > GE paper on "Living with Lighting" by Kenneth Guthrie. After Ken retired > from GE, he taught a course at George Washington University on Lighting > Protection. Ken has passed away some years ago but his works still remain > an > authority on lighting. > > Transmission lines should be grounded at four major points: > 1. At the top of the tower > 2. Just above the bend where the line leaves the tower > 3. At the entrance to the equipment building (A Polyphasor or similar > device here will help discharge any high voltage on the center conductor > of > the transmission line) > 4. At the equipment end of the line > The grounds on the tower are short and always directed down to be > connected > to the tower. > The grounds at the entrance to the equipment building ant at the equipment > will depend on the type of system grounding the building owner has put in > place. EG: Halo Ground Ring, Copper strap to bond all cabinets together, > Simple common ground wire routed at the bottom of the equipment for all > users to connect to, NO GROUND SYSTEM AT ALL! Every installation will be > slightly different. > Always put a lighting protector on the AC Power Lines. There are some good > ones and some cheap ones. You get what you pay for. Spend the money and > buy > a good one and connect it to the building/system ground. > If your equipment does not have a SOLA CV transformer in it as does GE > MASTR > II and some Motorola's buy a SOLA CV transformer to add to the lighting > protection on the AC side. > My success rate over 45 years is 99.999% by following these guidelines. > The > one failure had a direct hit on the antenna and a second direct hit on the > AC pole transformer, both shot to he--. However the radio equipment and > the > transmission line were not damaged. > Kenny's last bit of advice was always "Spend all that you can afford for > lighting protection and then borrow some more". > Fred > W5VAY > ----- Original Message ----- > From: "Joe" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Sunday, January 16, 2005 4:49 AM > Subject: Re: [Repeater-Builder] LDF5-50a > > >> >> We use 3 ground kits at work (cell company). The >> first at the top of the tower, the second at the base >> of the tower just before it makes the turn to go >> horizontal, and the third outside the entry port to >> the building. All ground kits are installed with the >> groundkit pigtail pointing towards the ground so that >> any possible lightning hit will have the shortest path >> to gound with the fewest turns in the groundwire. >> Inside the building, we install a polyphasor to the >> feedline and gound it to the common ground ring inside >> the shelter. We take very few damaging hits from >> lightning at the hundreds of sites we have. >> Interestly, most lightning damage comes in the power >> lines. >> >> Keep all groundwires as short as feasibly possible and >> always flowing downhill. I learned this from a >> lightning protection device installer. Never expect >> lightning to flow uphill, it always wants to go down >> and seek ground. >> >> 73, Joe, K1ike >> >> --- Eric Lemmon <[EMAIL PROTECTED]> wrote: >> > Rick, >> > >> > The conventional practice is to install a grounding >> > kit at the point just before the feedline enters the >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> >> >> > > > > > > > > Yahoo! Groups Links > > > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
