http://disqus.com/by/EEsince75/enMon, 24 Aug 2009 23:45:08 -0000http://ecmweb.com/mag/electric_lightning_strikes/#comment-15339674<p>Harold,<br>The answer to whether a individual building requires lightning protection is dependent on a number of criteria listed in NFPA 780. A metal building may require it, but it is not because it is metal, it is dependent on where it is located and the risk.</p><p>Lightning protection and building grounding systems are normally bonded together at the counterpoise system of the building. This is a requirement to keep all of the ground plane at the same potential should a lighting strike occur. Again some of this is listed in NFPA 70.</p><p>I'm an licensed electrical professional engineer (P.E.) in the state of my residence, I recommend you consult a P.E. in your state or a licensed electrical contractor that specializes in lightning protection systems and can provide a master label for the facility if it is required by your AHJ.</p>EEsince75Mon, 24 Aug 2009 23:45:08 -0000http://ecmweb.com/mag/electric_lightning_strikes/#comment-15330654<p>Answers to Harold &amp; jgeraldodelgado:</p><p>Harold,<br>Each situation is different, the current version of NFPA 780 is 2008 and it contains the requirements to determine if lightning protection (LP) is required. As mentioned in the article, a number steps are required to determine the need. I believe chapter 4 has the requirements for most standard building types.</p><p>************<br>jgerardodelgado;<br>The requirements for combustible structures are found in chapter 7 of NFPA 780. For some storage tanks there are a number of requirements that must be met in order to have the tank self-protect itself from a lightning strike.</p><p>*************<br>Both situations must be evaluated by a licensed engineer in you state. My electrical P.E. license is only for the state I reside in.</p>EEsince75Mon, 24 Aug 2009 19:24:43 -0000