<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 2, 2014 at 1:52 PM, Paul Brooks <span dir="ltr"><<a href="mailto:pbrooks-ausnog@layer10.com.au" target="_blank">pbrooks-ausnog@layer10.com.au</a>></span> wrote:<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="overflow:hidden">Earthing should happen in the power cord, in a<br>
strict tree-structure, to avoid earth loop currents - not the rack ironwork.</div></blockquote></div><br>actually if you *really* wanted to know the source of your problem, look up the difference between "power ground" and "signal ground."</div>
<div class="gmail_extra">Sometimes this is referred to as chassis ground / power ground.</div><div class="gmail_extra"><br></div><div class="gmail_extra">In NEBS they are two different things. For good reason.</div><div class="gmail_extra">
In most equipment unfortunately they are not different and while that works ok "most of the time" its not "all of the time."</div><div class="gmail_extra"><br></div><div class="gmail_extra">Personally I don't understand why people use racks with studs at all, very 90s view of things.  The L brackets and latch system of Open Compute racks is a good example of something with far more operational efficiency than the 2am-in-the-morning-looking-for-rack-studs-in-a-colo than what i've seen/heard/experienced many people go through.</div>
<div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">cheers,</div><div class="gmail_extra"><br></div><div class="gmail_extra">lincoln.<br>
<br clear="all"><div><span><font color="#888888"><br><span><font color="#888888">Lincoln Dale | Principal Engineer, Arista Networks Inc. | <a href="mailto:ltd@aristanetworks.com" target="_blank">ltd@aristanetworks.com</a><br>

au did: </font></span></font></span><span><font color="#888888"><span><font color="#888888"><a value="+14085475782">+61 3 9999 7442</a></font></span></font></span><span><font color="#888888"><span><font color="#888888"> | m: </font></span></font></span><span><font color="#888888"><span><font color="#888888"><a value="+61417457965">+61 417 457 <span>965</span></a></font></span></font></span><span><font color="#888888"><span><font color="#888888"> | us did: <a value="+14085475782">+1 408 547 5782</a>  <a value="+61417457965"><span></span></a> 
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