[TowerTalk] Tower grounding connections and foundation (Shawn Donley)

[N3AE]

Concerning lightning damage to a concrete foundation .... ran across the example in the link below. In this case a concrete guy anchor was damaged. But looking at the pictures, this might have been caused by moisture entry due to surface cracking with the lightning strike just finishing it off as the current pulse turned the moisture into steam. Hard to say. 

I think the real question is if a lightning strike can cause internal damage to a tower concrete foundation that you can not easily detect. 

N3AE 

http://www.copper.org/applications/electrical/pq/casestudy/a6137/a6137.html