It's hard to really predict how much induced voltage you will get from a surge. I guess it's one of those things that you just prepare for the worst and hope for the best. Obviously if the install is sticking up as the highest point on a hill, I'm going to take a little more care than one that is in the bottom of a valley. My problem is here in MO if they ain't on a hill they prolly ain't getting a signal anyhow:-(
Jim Scott Reed wrote: > Right, but I have had at least one radio that was POE protected at entry > and the 12AWG from the case to ground kept the Ethernet port from blowing. > > Jim Patient wrote: > >> Scott, >> >> You might want to take a look at NEC 810. If you install an external >> antenna mounting pole or mast, it must be grounded. The conductor >> entry point must also be grounded (where the cat5 enters the >> building). This isn't just good practice, it's the law and if you >> don't follow the law you are setting yourself up for an ugly >> negligence case in the event of a fire or other catastrophic event >> that results from your installation. >> >> In Kurts' case, I would install a Citel PoE surge protector in the >> enclosure with the radio. Install an external grounding block at the >> conductor entry point. Use shielded cat5 with the trickle wire >> grounded. Copper coated ground rods are available at most companies >> that sell satellite installation hardware. >> >> In the attached picture, the radio survived this hit. Obviously the >> Citel didn't;-) >> >> Jim >> 314-565-6863 >> jeffcosoho.com >> >> Scott Reed wrote: >> >>> Since all you need is to bleed off the induced current, my normal way >>> is to run 12AWG from the radio to the electrical ground rod. This >>> has stopped a similar issue on a couple of radios for me. >>> >>> Kurt Fankhauser wrote: >>> >>> >>>> I've got a problem client radio that almost always needs attention >>>> after a >>>> lightning storm. It is mounted with a gable mount on an eve so the >>>> radio >>>> itself is not physically grounded which I think is where my problem is >>>> coming from. The cat5 wire is grounded with a tranzeo POE ground >>>> lead but >>>> that is not stopping the surges. I've got a RB532 board which has >>>> lost 3 >>>> ethernet ports due to surges on the POE line even while using the >>>> tranzeo >>>> POE's ground. Now I have never lost a radio at this location but I >>>> have lost >>>> 3 ethernet ports and 2 POE injectos. This last time around the radio >>>> actually defaulted back to factory defaults. Radio is a TR-5a-21. Now I >>>> suspect that if this radio was mounted to a TV tower and not the eve >>>> that I >>>> would not be having these problems since it would naturally be >>>> grounded. >>>> Anyone have any ideas on what I need to do to get this thing >>>> grounded. How >>>> heavy of guage do I need? >>>> >>>> >>>> >>>> Kurt Fankhauser >>>> WAVELINC >>>> P.O. Box 126 >>>> Bucyrus, OH 44820 >>>> 419-562-6405 >>>> www.wavelinc.com >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> -------------------------------------------------------------------------------- >>>> >>>> >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> -------------------------------------------------------------------------------- >>>> >>>> >>>> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>>> >>>> >>> >>> >> ------------------------------------------------------------------------ >> >> ------------------------------------------------------------------------ >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
