[RFI] Brickwall plus ISOBAR
Jim Brown
jim at audiosystemsgroup.com
Mon Sep 17 18:45:43 EDT 2012
On 9/17/2012 3:11 PM, Larry Benko wrote:
> I recently picked up a couple of "outlet" strips that came out of a
> server farm. These strips are TrippLite PDU-2430 and rack mount with
> 24 outlets with a 120V 30A cord entering them. The 120V cord was
> connected to a box which I believe was a brickwall protector. The
> interesting thing is that the 120V feed is split into two 120V 15A
> circuits (each having a circuit breaker) and ALL safety grounds are
> tied together inside the 24 outlet box. The rack that this came from
> had 2 other PDUs mounted adjacent on the same rack effectively tying
> all safety grounds together for 6 circuits (72 outlets).
By code, all of those grounds MUST be tied together.
>
> By tying all the safety grounds together many of the surge issues
> recently discussed are greatly minimized. TrippLite touts this on
> their web site that since all the chassis of the equipment are at the
> same potential the damage to low voltage logic between equipment is
> minimized.
Yes, that's really good practice.
73, Jim K9YC
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