>From UL "Lightning Protection (2016):
"When we look at a Lightning Protection System in its most elementary form, it
is quite simple. An air terminal(s) to attract and catch a lightning strike, a
low resistance conducting cable that connects the air terminal to the earth
using a conducting electrode and provide a pathway to dissipate the high energy
into the earth. This system provides protection for the structure."
http://www.ul.com/wp-content/uploads/2014/04/LightningProtectionAG.pdf
So plain lightning rods do not operate to prevent strikes.
The notion that even various exotic spiny gizmos being marketed by a handful of
companies, can, by dissipating charges or by other mechanisms, minimize or
prevent lightning strikes to structures where they're installed has been
discredited. Or, to be conservative, the manufacturers' claims of
lightning-prevention-by-charge dissipation devices have not been supported by
real world tests.
There is a wealth of research in the literature on the subject of
"unconventional methods" of lightning protection; this article from the
Bulletin of the American Meteorological Society is a nice treatment and survey
with many technical references.
http://www.lightningsafety.com/nlsi_lhm/Uman_Rakov.pdf
Hank
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