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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