ground connectors

Mark Watts m.watts at
Fri Jun 8 03:00:34 CDT 2007

> This may be slightly off topic, I apologize if it is.
> I've just installed a bunch of PE2950's on a non-Dell el cheapo 12U rack
> enclosure which doesn't have an internal and external frame.  I'm also
> putting in a number of Dell PDU's which will be powered by a 2200VA UPS.
> The PDU's have a threaded grounding hole to which a ground wire is to be
> attached.  The PDU manuals assume a Dell rack enclosure and want the PDU
> ground wires attached to the external frame of the enclosure.
> I'm not an electrical engineer but perhaps some of you may have experience
> with this:
> 1) What should I attach the ground wires to if I don't have an external
> frame on my rack enclosure?
> 2) Is it assumed that the frame is to be grounded too?
> Any suggestions would be greatly appreciated.
> Rob Chamberland

I'm not sure how it works in the USA, since you don't always have 3-pin mains 

In the UK all electrical kit should be earthed to the rack and the rack 
earthed to ground. A lot of this is provided through the earth pin on our 
plugs, however you can always add more earthing.
The way we do this in our data-centre involves large metal spikes driven into 
the ground outside, with suitably large earthing bars connecting everything 
up to those.

Because there may be (I am not a UPS engineer) separation between the earthing 
on each side of the UPS, you should also earth the UPS to ground as well.


Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Trusted Information Management
Trusted Solutions and Services Group
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