[RFI] Brickwall plus ISOBAR

[Larry Benko]

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 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.

Larry, W0QE