2 Feb
2011
2 Feb
'11
1:54 p.m.
On Wednesday, February 02, 2011, Tony Duell wrote:
Yes, I mean 200A.
When you're dealing with high-ish voltage (277V to ground), and lots of
power being used (about 1000 amps per phase), leakages can add up
quickly... And, it's most likely a spike, not a continuous leakage
current, eg, a short-lived arc to ground from some worn out insulating
parts.
In any case a 200A short-term fault isn't all that huge. Ratings for
typical US house circuit breakers are around 10,000A interrupting
capability.
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
The ground
fault breaker (RCD by you) on the 480V supply the work's
main datacenter (which is rated at 1MVA, or 1200A currently - an
upgrade to 5MW is coming this year) was tripping on us when it was
set to 200-300A,
Dop you mean that? 200A (not mA) of earth leakage wouldappear to be
dangerously high in any installation.