"John Gilmer" wrote in
net:

Do you expect it to vaporize and set your roof on fire?

Well, engineering of lightning protection is about design of a protection
system that will, amongst other things, survive most events so as to
continue to provide protection, and to minimise incidental damage.

So, yes, down conductors adequately sized to manage the risk of the
conductor "vapourising" is part of the scope, and physical design to
minimise the risk of side flash causing damage is also part of the scope.

It is interesting, no confusing, that you have two guides that give such
different guidance. In Australia, we too have a standard for house wiring,
and another standard for lightning protection, but they are not in conflict
and our standard for lightning protection is well aligned with NFPA 780 on
the downconductor size issue.

Owen