Here are links I've posted previously over the years, consolidated under a relevant subject line for easier searching in the future.
"How to Protect Your Home and Its Contents from Lightning" by IEEE. ?No matter how much your radio system is protected, if the rest of your house is neglected, all is for naught. ?This is very readable. ?Google the title or try: ?http://www.lightningsafety.com/nlsi_lhm/IEEE_Guide.pdf?
"Lightning Protection & Grounding Solutions for Communication Sites" by Polyphasor. ?Best technical reference. ?Out of print, but Google the title for a downloadable pdf.
"National Electrical Code 2011" has good info in sections 250 on grounding and 800 for communications equipment. ?Easily misinterpreted by all but the best licensed electricians! ?Determine which electrical building codes applies to your area. ?Many counties or states have free downloadable files. ?For the 2011 edition see: ??http://www.town.belmont.ma.us/Public_Documents/BelmontMA_CommDev/National%20Electrical%20Code%202011.pdf
A good illustration of Ufer grounding details to supplement NEC (250) is at:
http://www.nh.gov/jtboard/050909_concreteencasedelectrodes.pdf
It is always wise to discuss your site's requirements with someone experienced with commercial lightning protection installations or at least several hams (with tall towers that aren't off the air due to lightning damage!). ?It is easy to miss the forest for the trees. ?But it also important to understand the minute details, that aren't obvious to most hams. ?
Ask to see other hams (or better, commercial towers with repeaters) lightning protection installations and ask WHY they did what they did and what they would do differently now.
Steve, W3AHL
Steve W3AHL