On Jul 18, 3:18*pm, Douglas Johnson wrote:
w_tom wrote:
*A protector is only as effective as its earth ground. Each layer of
protection is defined by the one always required component - earthing
electrode. *

Every plug-in surge protector has at least one path to earth -- the neutral line
which is bonded to ground at the panel. *You're right when you say a better
ground makes for better protection. *You're flat wrong when you extend that to
imply plug in protectors are ineffective. *


Yes, seems everyone here agrees with that, except W_.




Surge energy must be earthed before entering a building.

Indeed it is better to keep surge energy out of a building. *But "must" is way
too strong. *Even a panel protector does not keep it out of the building if the
panel is inside. *

Also true.



Plug-in protectors may even provide surges with destructive paths to
earth - Page 42 Figure 8. *Facts posted without insults and that
contradict half truths from a sales promoter.

As I'm sure you have read, the first line of body text after the diagram says
"Figure 8 shows a very common improper use of multiport protectors that does not
fully protect against lightning damage because of this effect." *

So the article attributes the failure to user error, not a failure of the
protector.

-- Doug


Yes, and another W_ argument shot down by his own reference. Did you
catch the posts where he lists the "responsible" manufacturers who
make and sell whole house protectors and then disparages other
companies that make and sell plug-ins? I showed him links months ago
that showed that all but one of these same "responsible" manufacturers
also sell plug-ins. The remaining one on his list talks about using
them as part of effective protection. Yet, he continues to post
this list, trying to imply there is a difference between resonsible
companies and those that sell plug-ins. Totally bizarre.