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<p>An important aside: The key to lightning protection is that the
protector clamps the high voltage as closely as possible to the
same reference point (possibly called "ground") as the circuit
under protection. An actual earth ground is unnecessary and
frankly, useless.</p>
<p>I have some Furse Ethernet protectors. The key is to connect the
ground strap of the Ethernet protector to the circuit land of the
ethernet circuit. That's as close as possible to the actual
reference voltage ("ground") of the active ethernet chips. I've
soldered the ground strap directly to the metal ring around the
CAT-x female. Works perfectly for lightning. If you run anything
longer than a couple of inches over to a so-called "earth" or
"u-ground" you just won't get any protection.</p>
<p>Some people have screwed that strap to an outlet screw or even to
the chassis of an Ethernet Switch. FORGET ABOUT IT. It's no
protection at all for high voltage lightning spikes. <br>
</p>
<p>Just proving once again that "earth" is a meaningless concept.
How do you think they keep airplane electronics from burning out
in lightning storms!<br>
</p>
<p>Bob</p>
<br>
<p>On 11/4/19 8:09 PM, Scott Dorsey wrote:</p>
<blockquote type="cite"
cite="mid:5dc0cbe0.S7PA82ZhR16lSyBs%25kludge@panix.com">
<pre class="moz-quote-pre" wrap="">A good introduction to lightning protection (which is not all there is
to grounding, but is an important part of grounding and it is the thing
most badly defeated by installing multiple grounding systems in one
building) can be found at....
<a class="moz-txt-link-freetext" href="http://www.panix.com/~kludge/LightningXprotectionXXgroundingXforXTelecommunications.pdf">http://www.panix.com/~kludge/LightningXprotectionXXgroundingXforXTelecommunications.pdf</a>
As far as I know the world record for bad grounding is held by the old
9:30 Club in Washington DC where more than 60 volts could be measured
between two PE grounds. This same institution may also hold the world
record for filthiest restrooms.
--scott
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<div class="moz-signature">-- <br>
<pre><font class="3D""" face="3D"Courier"">
If you want good sound on your album, come to
Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
Author: <b>Mastering Audio</b>
<a href="https://www.digido.com/">Digital Domain Website</a>
No trees were killed in the sending of this message. However a large number
of electrons were terribly inconvenienced.</font>
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