Re: Thunderstorms

w_tom wrote:
On Jul 31, 5:04 pm, Jolly Roger <jollyro...@xxxxxxxxx> wrote:
And those cheap-o power strips aren't even the kind of surge protectors
I'm talking about! I have never considered those to be "surge
protectors" any more than I consider a crappy moped to be a
"motorcycle"! ; )

Where does it list protection from each type of surge?
..
Where does SquareD "list protection from each type of surge"? It doesn’t. "Each type of surge" is bullcrap. Plug-in suppressors have MOVs from H-N, H-G, N-G. That is all possible combinations.
..
Two simple rules make reality obvious:
1) It has no dedicated connection to earth ground.
2) Manufacturer discusses earthing where? No earthing discussion
..
Poor w_'s religious blinders prevent him from understanding how plug-in suppressors work. The IEEE guide explains it is primarily by clamping, not earthing.
..
What does the NIST require of effective protectors on Adobe page 19
of 24?
..
What does the NIST guide really say about plug-in suppressors?
They are the "easiest solution".
..
Will a pathetic 420 joules absorb an entire surge? Surges may be
tens of thousands of joules; or more. How does a ‘near zero’ 420
joules absorb that entire surge?
..
Repeating:
"Arc-over plus the impedance of branch circuits limit the current, and thus energy that can flow to a plug-in suppressor to a surprisingly small value." After arc-over starts, at about 6,000V, the arc voltage drops to hundreds of volts.

How small? Experiments with a MOV at the end of branch circuits 30 ft and longer, with a surge current up to 10,000A, the maximum MOV energy dissipation was 35J. In 13 of 15 cases it was 1 Joule or less.

Another paper looked at a 100,000A (very strong) lightning strike to a utility pole behind a house in typical urban distribution (near worst case scenario). The current to the house was 10,000A per hot wire. Note 10,000A was used above.

(The plug-in suppressors I am using have a far higher rating than 420J.)
..
A surge protector is only as effective as its earth ground.
..
The required religious mantra.

Still no link to another lunatic that agrees with w_ that plug-in suppressors are NOT effective.

Still no answers to embarrassing questions:
- Why do the only 2 examples of protection in the IEEE guide use plug-in suppressors?
- Why does the NIST guide says plug-in suppressors are "the easiest solution"?
- Why does the IEEE guide say in the example "the only effective way of protecting the equipment is to use a multiport protector"?
- How would a service panel suppressor provide any protection in the example?

--
bud--
.

Relevant Pages

  • Re: Long cat5 run question
    ... Almost all service panel suppressors and plug-in suppressors use MOVs - metal oxide varistors - for the power wires. ... I assume we are not talking about a direct lightning strike to a building which requires lightning rods for protection. ... Lightning then is almost always a surge coming in on power or signal wires. ...
    (alt.internet.wireless)
  • Re: Surge Protector for Friederich 24k btu Wall A/C Unit - Is it okay to use?
    ... That surge could not be stopped by three miles of sky. ... Grounding Sensitive Electronic Equipment"), an IEEE standard, recognizes plug-in suppressors as an effective protection device. ...
    (alt.home.repair)
  • Re: Power Conditioners?
    ... will make that protection claim. ... a surge 8000 volts destructively through an adjacent TV. ... If the village idiot could only read and think he could discover what the IEEE guide says in this example: ... "With minimal reading ability w could find in the IEEE guide that plug-in suppressors work primarily by CLAMPING the voltage on all wires to the common ground at the suppressor. ...
    (rec.music.classical.recordings)
  • Re: How to clean up mains power?
    ... that same wire is maybe 130 ohms impedance to a surge. ... complete layer of protection - cites each type of surge and numbers ... In addition, at the SquareD link, literature for the ‘best’ service panel suppressor says "electronic equipment may need additional protection by installing plug-in TVSS devices at the point of use." ... But poor w_ has twist, because everyone says plug-in suppressors are effective, and w_’s religious belief in earthing is threatened. ...
    (sci.electronics.equipment)
  • Re: Surge Protector for Friederich 24k btu Wall A/C Unit - Is it okay to use?
    ... Excellent information on surges and surge protection is in an IEEE guide at:http://omegaps.com/Lightning%20Guide_FINALpublishedversion_May051.pdf ... The IEEE guide is aimed at those with some technical background. ... The IEEE guide explains plug-in suppressors work by CLAMPING the voltage ...
    (alt.home.repair)
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