[AusNOG] Rack Studs - AWESOME

[Shaun McGuane]

I just ordered some of these too ... very nice guys good call!





Shaun McGuane | CEO
 1300 722 532
 0400 177 077
 shaun at rackcentral.com.au
 www.rackcentral.com.au
 Level 3/480 Collins St Melbourne, VIC 3000

 
 

-----Original Message-----
From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Peter J. Cherny
Sent: Thursday, 2 January 2014 3:40 PM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Rack Studs - AWESOME

>> On Thu, Jan 2, 2014 at 10:51 AM, Andrew Jones <aj at jonesy.com.au 
>> <mailto:aj at jonesy.com.au>> wrote:
>> Wouldn't any kit sharing a common ground (via the PDU) be OK? I guess 
>> if your devices are powered via DC plug packs it would be a different 
>> story.
> On 01/02/14 14:06, Damian Guppy wrote:
> The earthing pin on a PDU cable (ie power cable) should not be treated 
> as a common ground, and in fact should not be connected to the casing 
> / chassis of any equipment internally. That is why you will still see 
> ground points on a lot of gear (particularly from Cisco)

AS 3000 and AS S009 suggest otherwise !

<flame>
Any suggestion that the earth leg "should not be connected to the casing/chassis"
is a recipe for DEATH by electrocution.
A bit like cutting off the earth pin on the home hifi to fix the hum.
</flame>

People confusing safety and signal grounding schemes has been an ongoing problem as long as I can remember (40+ years) but has always been understood by telecommunication engineers.

Best practice is now well enshrined in the various electrical and telecomms standards.

Keywords of interest "equi-potential point" "reference ground" 
"sacrificial earth" "common-mode noise"

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