Surge suppressors

David Mathog mathog at
Thu Oct 24 10:19:24 PDT 2002

What brand surge suppressors are commonly used in clusters?  

Tripplite 6 outlet Isobar Ultras jave worked well
on other equipment but these are only rated for 12A.
With 5 x 300W power supplies plugged in they'd be running
very close to their limit (5*300/120 = 12A).
But maybe that's too pessimistic.  Each node holds a Tyan 2466
Mobo, one MP2000+ processor, one 40Gb IDE disk, a floppy, 1 Gb
ECC RAM, 3 fans, and a cheap VGA card.  So it probably doesn't
draw anywhere near 300W except possibly when the
power is first turned on.  The surge suppressor should be 
rated high enough to handle the load if/when we add the
second CPU in each node.

Each circuit has a 20Amp breaker, 20 Amp rated wiring, NEMA
5-15P sockets (could be upgraded to NEMA 5-20P for a nominal
amount.)  4 circuits are available.


David Mathog
mathog at
Manager, Sequence Analysis Facility, Biology Division, Caltech

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