On May 4, 3:46 am, Franc Zabkar wrote:
OK, thanks. That all makes sense. However, I was thinking of a typical
2-pin TV, not an earthed computer.

Black AC wire surge is now shunted (clamped, diverted) to white
wire. Surge now has two paths to obtain earth ground via the TV.

One most common path to ground is TV's cable. Why? Cable TV is now
properly installed - connected (bonded) typically 'less than 10 feet'
to earth ground at the service entrance. If an AC line surge is
earthed at that same service entrance using the single point earth
ground, then no destructive surge circuit exists through that two wire
TV.

But the home owner believed myths of plug-in protectors instead of
learning why earthing (and 'whole house' protectors) is so important.
Whereas surge on cable TV is dissipated in earth, simultaneous surge
on AC electric arrives at an adjacent protector, is shunted to white
(neutral) AC wire, and now has two destructive paths via that TV to
earth ground. Eliminate the plug-in protector to have only one
potentially destructive incoming path (increased protection). Or
properly earth a 'whole house' protector to have zero potentially
destructive paths.