[c-nsp] Grounding your 6500's?

[Matthew Crocker]

Grounding everything is a 'Good Thing' (tm).  We generally attach a  
ground to everything that comes with a ground lug attachment point.  If  
that means we need to ground the chassis, each power supply, the rack.   
  We have a main ground bus running along the top of our racks.  We  
H-Tap that bus onto a grounding bar for each rack. Equipment in the  
rack is grounded to the grounding bar.  Everything is grounded back to  
the main ground bus (Racks, Conduits, AC & DC power systems,  
transformers, panels, everything).  The grounding bus is attached to  
the ground (duh) which is the a copper mesh buried outside.

I have seen installations, mostly by Lucent that have a completely  
separate grounding system for the phone switch.  The power plant is  
grounded to the building ground per NEC requirements. The  
switch/equipment is grounded to a ground field outside using 3 sets of  
400 MCM cable.  Talk about over kill.  I think having two floating  
ground is a bad thing and can cause ground loops.

-Matt

On Aug 12, 2004, at 9:26 AM, Temkin, David wrote:

> Cisco specifically states that you "must" ground 6500 chassis, both at
> the chassis and the power supply ground lugs (separate from the AC (or
> DC) ground plant).
>
> http://www.cisco.com/en/US/customer/products/hw/switches/ps708/ 
> products_
> installation_guide_chapter09186a008020e0a9.html#wp1028096
>
>
> Does anyone actually do this?  Our director got a "horror story" from
> someone else who didn't ground their 6500's and so we're looking into
> it.  It seems pretty nuts to have to run separate ground lines to each
> switch and I've never seen it in the field, but I'm just curious.
>
> -Dave
>
>
>
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