Wall receptacle is safety ground; not earth ground - as
explained in another post in this thread. However let's
assume the plug-in protector does earth a destructive
transient via wall receptacle. Now that transient is on a
wire bundled with other wires. Induced transient is now
created by that plug-in protector. By earthing on safety
ground wire, we have now induced transients on all other
adjacent wires. What kind of protection is that?
Ineffective.

Same problem applies to the service entrance and single
point earth ground. All earthing wires must be installed from
each utility wire to earth ground separated from all other
wires. Too many installers want to be neat. They make clean
sharp bends and nylon ty-wrap all wires together. IOW they
compromise the protection 'system'. Even sharp wire bends
increase wire impedance. Earthing wires must be shorter (less
than 3 meters), no splices (which wall receptacle safety
ground wires violate), not inside metallic conduit, and
separated from all other wires.

Just more reasons why plug-in protectors are so
ineffective. Therefore plug-in protectors avoid all
discussion about earthing. They fear you might learn about
the less than 3 meter necessity. So they avoid all discussion
about earthing. They would even encourage the consumer to be
confused about safety ground verse earth ground.

Mike Tomlinson wrote:
In article , w_tom writes
In the meantime, plug-in protectors are not effective,
cost tens of times more money per protected appliance, and
are typically undersized.No sense wasting good money on
ineffective protectors that don't even claim to protect
from the typically destructive transient. A protector is
only as effective as its earth ground - which plug-in power
strip and UPS manufacturers fear you might learn.

And in Europe, the "earth ground" on mains wiring is good,
hence plug-in surge protectors do the job they were designed
to do, shunting the surge to earth.

In the States, not all power outlets can be assumed to have
an earth connection, so plug-in surge protectors have to
shunt surges to the other phase line, which makes them vastl
less effective.

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