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Lightning Protection Systems
Kirt's Cogitations™ #284

"Lightning Protection for the Amateur Radio Operator's Home" June 2017 QST - RF CafeTypical Residential Lightning Protection System - RF CafeIf you have ever seen the result of a lightning strike on electronic equipment, then you know how devastating it can be - often total destruction that includes molten metal. Woe be unto any human operator who happens to be in contact with it at the time of the strike. Unprotected antennas are begging for contact. Shortly after leaving a company where I worked on a Tx/Rx system for a phased array weather radar I got word that the indoor equipment rack took a major hit because the guy who maintained the site forgot to reconnect a lightning rod system cable after moving it during snow removal. I was glad not to be there to have to repair everything.

Lightning Collection Area Calculation Input Screen - RF CafeA lot of knowledge has been gained both in lightning properties and strike mitigation practices. A big part of properly instituting a lightning protection system is assessing strike risk and then designing and implementing the necessary lightning rods (aka air terminals), cables and connectors, surge protectors, and grounding rods. The American Radio Relay League (ARRL) provides a lot of resources for accomplishing this objective, including publishing articles like "Lightning Protection for the Amateur Radio Operator's Home," in the June 2017 issue of QST magazine. In fact, the ARRL considers the dissemination of this data so important that it makes it available even to non-subscribers.

One resource provided is a page on the East Coast Lightning Equipment website with a NFPA 780 Simplified Lightning Risk Calculator for calculating whether your site should have lightning protection installed. Enter the dimensions, material composition, property type, and lightning strike frequency (map provided), then it generates a 2-page PDF file with the results. The screen shots given here are for RF Cafe headquarters in Erie, Pennsylvania, both with and without a 3' antenna mast. You can see how the strike risk area doubles with the presence of the mast.

In the Northeast region where I live, the estimated cost of lightning protection per square foot of floor area is about 95¢ for copper parts. My house is 912 ft2 and garage is 330 ft2 for a total of 1,242 ft2. That results in a cost of about $1,180 - not too awful. I installed a 2-pole, whole-house lightning arrestor at my circuit breaker panel many years ago, and just this year I installed a separate lightning arrestor + brownout protector on my air conditioner compressor. However, I still do not have a lightning rod. One advantage my house has is that the power lines in the neighborhood are on poles and on my side of the street, so I benefit somewhat from the lightning cable that runs on top of all the other wires. That, and the tallest trees in the immediate area are in the neighbors' yards.

Until I do get around to putting in lightning rods, I'll be sure to do as my parents taught me to do during a severe lightning storm: unplug valuable equipment, don't touch the phone or water pipes, and stay away from windows.

 

 

Posted May 31, 2017


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These original Kirt's Cogitations™ may be reproduced (no more than 5, please) provided proper credit is given to me, Kirt Blattenberger.

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   Cog·i·ta·tion [koj-i-tey'-shun] – noun: Concerted thought or reflection; meditation; contemplation.
   Kirt [kert] – proper noun: RF Cafe webmaster.

These items are an archive of past Topical Smorgasbord items that have appeared on the RF Cafe homepage. In keeping with the "cafe" genre, these tidbits of information are truly a smorgasbord of topics. They all pertain to topics that are related to the general engineering and science theme of RF Cafe. Note: There is also a huge collection of my 'Factoids' (aka 'Kirt's Cogitations') that might interest you as well.

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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