On May 6, 12:24*pm, wrote:
Uh huh. Now we're getting somewhere. *They do use some of the same
protection techniques. * And that includes surge protection that uses
clamping to keep various parts of aircraft systems at the same
potential.

Aircraft have two wire AC circuits with daisy chained power strip
protectors? How many times do you post irrelevant to the OP's
questions? Even airplanes need earthing which is why runways have
extensive earthing systems to ground airplanes. And still completely
irrelevant to the OP's question - which trader does not answer.

Why did plug-in protectors damage a network of powered off
computers? Protectors without earthing do not absorb surges as trader
claims. Do not absorb surges as a daisy chain of power strips must
do. Those protectors - even if in a daisy chain - simply gave a surge
more paths to find earth ground destructively through the entire
network. Diverts the surge to earth - which can be through the
adjacent computer or TV if too close to appliances and too far from
earth ground. Protector simply gave a surge on more wires - and put
many thousands of volts onto those appliances.

How curious. Page 42 Figure 8. Using a power strip protector, the
surge was earthed 8000 volts destructively through an adjacent TV.
Nothing stops or absorbs surges. Same problem that we engineers saw
and corrected by earthing a 'whole hosue' protector - and no power
strip protectors..

Surge protection is about keeping surges outside the building.
Current that does not flow inside a building and does not flow through
appliances causes no damage. Current that is diverted harmlessly into
earth creates no destructive voltage. Simple solution that also costs
less money. Better earthing and only one 'whole house' protector is
even necessary to protect power strip protectors as well as protect
everything else. An effective protector that costs the OP maybe $1
per appliance.

What does trader recommend? He wants to argue about airplanes.
Those with so much animosity also have trouble even remembering the
OP's question. Little hint: the newsgroup is called alt.home.repair.
Not alt.airplane.repair.