On Oct 5, 7:58*am, wrote:
Maybe W_ would like to explain to us how it is that surge protection
INSIDE an appliance is usefull in preventing damages from surges, yet
a plug-in protector won't provide any protection. *

If protection inside an appliance accomplishes what a plug-in
protector does, then why waste so much money on a plug-in protector?
Protection inside appliances assumes the surge will be earthed before
entering a building. Otherwise internal appliance protection may be
overwhelmed. The plug-in protector would do nothing. Worse, it may
even provide paths bypassing appliance protection (if the 'whole
house' protector is not installed). As demonstrated in previous
examples, a surge was even earthed destructively through a network of
powered off computers because plug-in protectors were used (without
the essential ‘whole house’ protector).

A plug-in protector provides nothing useful; may even make appliance
damage easier. But it sure is profitable. And the properly earthed
'whole house' protector is still required if or if not a plug-in
protector is installed.

Should we spend tens or 100 times more money for the plug-in
protectors - to only do what is already accomplished inside an
appliance? Or earth one 'whole house' protector so that all household
appliances are protected?

This answer was provided repeatedly. As stated by industry
professionals, science papers, and generations of experience - even
those who installed surge protection 100 years ago - a protector is
only as effective as its earth ground. One properly earthed 'whole
house' protector is essential so that protection inside all appliances
is not overwhelmed. Plug-in protector provides nothing useful, does
not even claim to provide that protection, AND can even contribute to
damage of adjacent appliances.

So that plug-in protector does not contribute to appliance damage,
earthing a 'whole house' protector is necessary. Once the 'whole
house' protector is properly installed, then protection inside each
appliance is not overwhelmed. Why would anyone spend tens or 100 times
more money for plug-in protectors? Because myths so often replace
simple science.