>>2795188http://www.atmo.arizona.edu/students/courselinks/spring15/atmo589/ATMO489_online/lecture_20/lect20_lightning_protection_structures.html>A roof can be protected by multiple lightning rods. An old question is whether pointed rods or blunt rods work best. Some recent research (a couple of recent studies: "Measurements of Lightning Rod Responses to Nearby Strikes," C.B. Moore, G.D. Aulich, and W. Rison, Geophys. Res. Lett., 27, 1487-1490, 2000 and "Lightning Rod Improvement Studies," C.B. Moore, W. Rison, J. Mathis, G. Aulich, J. Appl. Meteorol., 39, 593-609, 2000 ) suggest that the blunt rods might be more effective. The NFPA allows either type to be used. Rods should be at least 10 inches tall.There's also wire mesh or just plain wire protection.
>lightning traveling 10km of ionised air could give less of a shit about 5m wood beam vs steel pipeAs I said, negligible amounts.
