Re: How to clean up mains power?
- From: N7ZZT - Eric Oyen <n7zzt@xxxxxxxxx>
- Date: Wed, 15 Aug 2007 23:59:57 -0700
w_tom wrote:
I know of bill. His is not the only source I reference though.
The Ham radio corp talks about earthing for surge protection. And
layering is defined where the earthing electrodes are located. Ham
radio operators know the importance of earthing. Better protection
comes from better earthing connections such as Bill Ott demonstrates
in:
http://home1.gte.net/res0958z/
Defense in depth: but each layer is defined by the earthing.
Primary protection layer is provided by the utility. What is the
center point of that protection? Utility earthing. Secondary layer
of protection is building earthing. A plug-in protector is part of
the same secondary layer that must include a 'whole house' protector.
Both are in same layer; both would connect to the same earthing. So
where is this layering? A plug-in protectors adjacent to the TV or
plugged into the breaker box is in the same layer.
hello? think about it man. each point is tied to the same ground (it took
rather a long while to get the whole house done so that all grounds are at
same potential and I didn't bother with that silly conduit trick some home
developers tried using in the 1980's either!)
Why does Bud's citation page 42 Figure 8 show a plug-in protector
earthing a surge, 8000 volts destructively, throught an adjacent TV. A
protector without earth ground even earthed surges, destrutively,
through a network of computers. Unlike Bud, one here has been doing
this stuff for numerous decades. How does a protector without earth
ground 'layer' when IEEE papers routinely show earthing as essential
for shunt mode protectors? Each layer is defined by grouding.
have you read any of the documents he submitted (let alone his post)? Had
you bothered to read (and think) perhaps the answers you seek would have
become painfully clear. also, I did not see mention of that specific
scenario showing up in the documentation (as presented).
Lastly, I do run a small computer center here at home and it took me a
better part of the last 5 years to get the while house up to IEEE
recommended wiring (with a little over engineering on my part)
Why do the telco define each protection layer by grounding? They
don't do what Bud recommends. They do as Bill Ott demonstrates. And
Orange County FL:
http://www.psihq.com/AllCopper.htm
and an industry consultant:
http://www.gpr-expert.com/
and an industry benchmark:
http://www.polyphaser.com/technical_notes.aspx
and the station engineer at WXIA-TV:
http://www.harvardrepeater.org/news/lightning.html
another set of good sources, thenk you (always looking for more).
Why do Bud's citation not agree with what he claims? Why does that
protector without earthing then shunt the surge 8000 volts
destructively through an adjacent TV? Page 42 Figure 8.
perhaps that was a demonstration of what NOT TO DO? did that ever occur to
you?
Meanwhile, why did you have the same power strip protectors that Bud
recommends; and suffer damage as a result? Does price determine
quality? Of course not.
really? funny. the cheaper they are, the less time they last (I happen to
work in retail marketing on my other job and I do see this all the time.
the really cheap power strips offer no protection at all (aside of a single
circuit breaker) and the cheapo "protected" power strips aren't much
better.
I am not sure I trust those power strips either. I have had 2 expensiveHow did you suffer damage? Layering did not work. But you then
pieces of equipment fry while plugged into those (cost a bunch of cash
to repair/replace).
recommend layers not defined by earth ground? Power strips had no
earthing. Therefore Page 42 Figure 8 explains the damage - a power
strip earthing a surge destructively through your now fried pieces of
equipment. Why do you call that efffective protection? You suffered
damage because the power strip did same damage demonstrated in Bud's
citation - Page 42 Figure 8. A power strip without a short connection
to earth ground therefore earthed that surge, destructively, through
expensive pieces of equipment.
How did I suffer damage?
well, before I embarked on the "great rewiring" of my residence about 5
years ago, I ended up losing 2 very expensive computers to a couple of
surges caused by an exploding "pole pig" transformer in my back yard (the
result of which was that my house (and several others on the block) were
subjected to the 12.5 KV voltage from the primaries on the same poles.
Homeowners insurance covered the loss of the major appliances (washer,
drier, fridge, etc) but not the computer equipment (I never did get a
straight answer from them and ended up having to eat the cost after
attempting court action - I have since switched insurance policies).
you keep bringing up page 42 figure 9 like its some kind of mantra.
personally, it just sounds to me like you are whining and don't really
understand the problem at hand. have you a real point to make here?
Experienced ham radio operators recommend earthing for protection as
was demonstrated by operators even in the early 20th Century.
ok captain obvious? any other "salient" points to make?
.
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