On Monday, October 19, 2015 at 5:07:18 PM UTC-4, westom wrote:


BTW, if a 'whole house' protector fails on any surge, then it was grossly undersized. Numbers posted even for that. A direct lightning strike is typically 20,000 amps.

Oh no, here we go again. It's been pointed out to you 100 times over
the years that while a lightning strike can be 20,000 amps, the chances
of that showing up at the panel are virtually nil. Typical lightning
strike doesn't hit the panel, it hits the utility pole, the service
cable, the mast head, etc. and flashover conducts most of that current
to ground. Only a small fraction reaches the panel.



So a minimal 'whole house' protector is 50,000 amps. Because effective protectors must never fail catastrophically during any surge. If a 50,000 amp 'whole house' protector fails, then it is replaced by a 100,000 amp protector. Nothing new here. This stuff has been well understood long before PCs even existed (ie more than 100 years ago).

If it never fails, then why would it ever need to be replaced?
Even you yourself explained how every surge degrades a surge protector.
Enough surges, it fails.