w_tom wrote:
snip

At any rate, perspective of this discussion is Lightning
protection. (Although it originally was about a faraday cage
provided by a chain link cage), it has morphed into the AC
nature of lightning; the component that makes lightning so
challenging and destructive. So challenging that some call
lightning capricious. The AC component in lightning that make
protection difficult is not intuitively obvious. The
components that tend to be most challenging are in the
kilohertz and megahertz range. IOW the DC component is rarely
considered in the overall design of lightning protection.
Higher frequency components are discussed as if higher
frequencies are the only part that exists.
snip

Think about what you just wrote. If you size the ground wire to
a lightning rod only on the basis of high frequency components,
and don't account for the essentially DC component (which can
exceed 10,000 amps, according to the Web site you cited earlier),
you won't have much protection.

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