Re: Lightning and computer?
- From: w_tom <w_tom1@xxxxxxxxxxx>
- Date: Fri, 22 Apr 2005 19:27:41 -0400
How many joules did Al say were in those power strips? How
big is that inductor that will stop what three miles of sky
could not?
Let's see how good those plug-in protectors are. Notice the
active components - MOVs - were even removed. The light says
that plug-in protector is still working even after the MOVs
were removed. What kind of protection is that?
http://www.zerosurge.com/HTML/movs.html
How do these protectors fail when Al Dykes says they are so
effective?
Al selectively quote a Primer from Telebyte (arcelect.com
). But he did not appreciate nor comprehend a so critical
statement:
> As previously mentioned, the connection to earth ground can
> not be over emphasized.
So we look at a Telebyte product: Model 22NX. It says:
> An additional screw terminal is provided to make the connection
> to earth ground. This wire should be at least #12 gauge or
> larger and be as short as possible.
From their model 22PX:
> The Model 22PX should be installed close to the earth ground.
That dedicated earth ground: something that ineffective
plug-in protectors do not provide. Al selectively read a
Telebyte app note. He saw references to MOVs, GDTs, and
inductors. Then assumed he knew everything.
However even Telebyte tells Al that earthing is the most
critical aspect in protection. He did not read this from
Telebyte's Reference Manual 0315-0161 Rev. D:
> 2.2 Proper Earth Ground
> Lightning protectors require a good earth ground for proper
> protection of the equipment they are connected to. This is
> accomplished by using a heavy-gage wire (AWG12 or heavier)
> that connects the ground stud on the Protector to a
> building ground. This wire should be no longer than ten feet.
What did I post repeatedly? A short earthing connection of
*less than 10 feet*. What does a plug-in protector not
provide? An earthing connection of *less than 10 feet*. Al,
selectively quoted before learning. A protector is only as
effective as its earth ground. Even Al's own citation does
not recommend plug-in protectors. Even Al's own citation does
not claim to absorb or block destructive transients. Al
forgot to read everything before he just knew everything.
Explain how those power strip protectors cited in
Zerosurge.com provided any effective protection. Explain how
well they stopped or absorbed destrutive transients. Explain
why the indicator light says the protector is good even when
MOVs are completely removed. A protector is only as
effective as its earth ground. Even Al Dykes' Telebyte
citation says same.
Al Dykes wrote:
> In article <4268771A.F973445C@xxxxxxxxxxx>, w_tom <w_tom1@xxxxxxxxxxx> wrote:
>> The effective protector never tries to absorb or block
>> destructive transients.
>
> Wrong.
>
> A surge protector, at the very minimum, has 3 MOV chips, one across
> each leg part (hot, neutral, ground). These chips are rated as to the
> total lifetime energy they can absorbe, measured in joules. That's
> one close strike or lots of little surges.
>
> A surge protector will have an indicator lamp that informs you when
> the MOV chip is used up.
>
> http://www.arcelect.com/lightnin.htm
>
> The next step up in quality surge protection has a couple big
> inductors to attentate the pulse.
>
> None of this will stop anything like a driect hit.
>
> Lightning is one of 100 ways your computer can die. Backup backup
> backup.
.
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